| blob | 209b9b6b34b7b3df77d84e18cb45cc55eef46f18 |
1 /* Definitions of target machine for GNU compiler. MIPS version.
2 Copyright (C) 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998
3 1999, 2000, 2001 Free Software Foundation, Inc.
4 Contributed by A. Lichnewsky (lich@inria.inria.fr).
5 Changed by Michael Meissner (meissner@osf.org).
6 64 bit r4000 support by Ian Lance Taylor (ian@cygnus.com) and
7 Brendan Eich (brendan@microunity.com).
9 This file is part of GNU CC.
11 GNU CC is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2, or (at your option)
14 any later version.
16 GNU CC is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with GNU CC; see the file COPYING. If not, write to
23 the Free Software Foundation, 59 Temple Place - Suite 330,
24 Boston, MA 02111-1307, USA. */
27 /* Standard GCC variables that we reference. */
35 /* MIPS external variables defined in mips.c. */
37 /* comparison type */
43 CMP_MAX /* max comparison type */
44 };
46 /* types of delay slot */
51 DELAY_FCMP /* delay after doing c.<xx>.{d,s} */
52 };
54 /* Which processor to schedule for. Since there is no difference between
55 a R2000 and R3000 in terms of the scheduler, we collapse them into
56 just an R3000. The elements of the enumeration must match exactly
57 the cpu attribute in the mips.md machine description. */
60 PROCESSOR_DEFAULT,
61 PROCESSOR_R3000,
62 PROCESSOR_R3900,
63 PROCESSOR_R6000,
64 PROCESSOR_R4000,
65 PROCESSOR_R4100,
66 PROCESSOR_R4300,
67 PROCESSOR_R4600,
68 PROCESSOR_R4650,
69 PROCESSOR_R5000,
70 PROCESSOR_R8000
71 };
73 /* Recast the cpu class to be the cpu attribute. */
74 #define mips_cpu_attr ((enum attr_cpu)mips_tune)
76 /* Which ABI to use. These are constants because abi64.h must check their
77 value at preprocessing time.
79 ABI_32 (original 32, or o32), ABI_N32 (n32), ABI_64 (n64) are all
80 defined by SGI. ABI_O64 is o32 extended to work on a 64 bit machine. */
82 #define ABI_32 0
83 #define ABI_N32 1
84 #define ABI_64 2
85 #define ABI_EABI 3
86 #define ABI_O64 4
88 #ifndef MIPS_ABI_DEFAULT
89 /* We define this away so that there is no extra runtime cost if the target
90 doesn't support multiple ABIs. */
91 #define mips_abi ABI_32
92 #else
94 #endif
96 /* Whether to emit abicalls code sequences or not. */
99 MIPS_ABICALLS_NO,
100 MIPS_ABICALLS_YES
101 };
103 /* Recast the abicalls class to be the abicalls attribute. */
104 #define mips_abicalls_attr ((enum attr_abicalls)mips_abicalls)
106 /* Which type of block move to do (whether or not the last store is
107 split out so it can fill a branch delay slot). */
112 BLOCK_MOVE_LAST /* generate just the last store */
113 };
166 /* Functions to change what output section we are using. */
171 /* Stubs for half-pic support if not OSF/1 reference platform. */
173 #ifndef HALF_PIC_P
174 #define HALF_PIC_P() 0
175 #define HALF_PIC_NUMBER_PTRS 0
176 #define HALF_PIC_NUMBER_REFS 0
177 #define HALF_PIC_ENCODE(DECL)
178 #define HALF_PIC_DECLARE(NAME)
180 #define HALF_PIC_ADDRESS_P(X) 0
181 #define HALF_PIC_PTR(X) X
182 #define HALF_PIC_FINISH(STREAM)
183 #endif
185 /* Macros to silence warnings about numbers being signed in traditional
186 C and unsigned in ISO C when compiled on 32-bit hosts. */
192 \f
193 /* Run-time compilation parameters selecting different hardware subsets. */
195 /* Macros used in the machine description to test the flags. */
197 /* Bits for real switches */
219 #define MASK_NO_CHECK_ZERO_DIV \
221 #define MASK_CHECK_RANGE_DIV \
223 #define MASK_UNINIT_CONST_IN_RODATA \
225 consts in rodata */
227 multiply-add operations. */
229 /* Debug switches, not documented */
241 /* Dummy switches used only in specs */
244 /* r4000 64 bit sizes */
245 #define TARGET_INT64 (target_flags & MASK_INT64)
246 #define TARGET_LONG64 (target_flags & MASK_LONG64)
247 #define TARGET_FLOAT64 (target_flags & MASK_FLOAT64)
248 #define TARGET_64BIT (target_flags & MASK_64BIT)
250 /* Mips vs. GNU linker */
251 #define TARGET_SPLIT_ADDRESSES (target_flags & MASK_SPLIT_ADDR)
253 /* Mips vs. GNU assembler */
254 #define TARGET_GAS (target_flags & MASK_GAS)
255 #define TARGET_MIPS_AS (!TARGET_GAS)
257 /* Debug Modes */
258 #define TARGET_DEBUG_MODE (target_flags & MASK_DEBUG)
259 #define TARGET_DEBUG_A_MODE (target_flags & MASK_DEBUG_A)
260 #define TARGET_DEBUG_B_MODE (target_flags & MASK_DEBUG_B)
261 #define TARGET_DEBUG_C_MODE (target_flags & MASK_DEBUG_C)
262 #define TARGET_DEBUG_D_MODE (target_flags & MASK_DEBUG_D)
263 #define TARGET_DEBUG_E_MODE (target_flags & MASK_DEBUG_E)
264 #define TARGET_DEBUG_F_MODE (target_flags & MASK_DEBUG_F)
265 #define TARGET_DEBUG_G_MODE (target_flags & MASK_DEBUG_G)
266 #define TARGET_DEBUG_H_MODE (target_flags & MASK_DEBUG_H)
267 #define TARGET_DEBUG_I_MODE (target_flags & MASK_DEBUG_I)
269 /* Reg. Naming in .s ($21 vs. $a0) */
270 #define TARGET_NAME_REGS (target_flags & MASK_NAME_REGS)
272 /* Optimize for Sdata/Sbss */
273 #define TARGET_GP_OPT (target_flags & MASK_GPOPT)
275 /* print program statistics */
276 #define TARGET_STATS (target_flags & MASK_STATS)
278 /* call memcpy instead of inline code */
279 #define TARGET_MEMCPY (target_flags & MASK_MEMCPY)
281 /* .abicalls, etc from Pyramid V.4 */
282 #define TARGET_ABICALLS (target_flags & MASK_ABICALLS)
284 /* OSF pic references to externs */
285 #define TARGET_HALF_PIC (target_flags & MASK_HALF_PIC)
287 /* software floating point */
288 #define TARGET_SOFT_FLOAT (target_flags & MASK_SOFT_FLOAT)
289 #define TARGET_HARD_FLOAT (! TARGET_SOFT_FLOAT)
291 /* always call through a register */
292 #define TARGET_LONG_CALLS (target_flags & MASK_LONG_CALLS)
294 /* generate embedded PIC code;
295 requires gas. */
296 #define TARGET_EMBEDDED_PIC (target_flags & MASK_EMBEDDED_PIC)
298 /* for embedded systems, optimize for
299 reduced RAM space instead of for
300 fastest code. */
301 #define TARGET_EMBEDDED_DATA (target_flags & MASK_EMBEDDED_DATA)
303 /* always store uninitialized const
304 variables in rodata, requires
305 TARGET_EMBEDDED_DATA. */
306 #define TARGET_UNINIT_CONST_IN_RODATA (target_flags & MASK_UNINIT_CONST_IN_RODATA)
308 /* generate big endian code. */
309 #define TARGET_BIG_ENDIAN (target_flags & MASK_BIG_ENDIAN)
311 #define TARGET_SINGLE_FLOAT (target_flags & MASK_SINGLE_FLOAT)
312 #define TARGET_DOUBLE_FLOAT (! TARGET_SINGLE_FLOAT)
314 #define TARGET_MAD (target_flags & MASK_MAD)
316 #define TARGET_FUSED_MADD (! (target_flags & MASK_NO_FUSED_MADD))
318 #define TARGET_4300_MUL_FIX (target_flags & MASK_4300_MUL_FIX)
320 #define TARGET_NO_CHECK_ZERO_DIV (target_flags & MASK_NO_CHECK_ZERO_DIV)
321 #define TARGET_CHECK_RANGE_DIV (target_flags & MASK_CHECK_RANGE_DIV)
323 /* This is true if we must enable the assembly language file switching
324 code. */
326 #define TARGET_FILE_SWITCHING \
327 (TARGET_GP_OPT && ! TARGET_GAS && ! TARGET_MIPS16)
329 /* We must disable the function end stabs when doing the file switching trick,
330 because the Lscope stabs end up in the wrong place, making it impossible
331 to debug the resulting code. */
332 #define NO_DBX_FUNCTION_END TARGET_FILE_SWITCHING
334 /* Generate mips16 code */
335 #define TARGET_MIPS16 (target_flags & MASK_MIPS16)
337 /* Architecture target defines. */
338 #define TARGET_MIPS3900 (mips_arch == PROCESSOR_R3900)
339 #define TARGET_MIPS4000 (mips_arch == PROCESSOR_R4000)
340 #define TARGET_MIPS4100 (mips_arch == PROCESSOR_R4100)
341 #define TARGET_MIPS4300 (mips_arch == PROCESSOR_R4300)
343 /* Scheduling target defines. */
344 #define TUNE_MIPS3000 (mips_tune == PROCESSOR_R3000)
345 #define TUNE_MIPS3900 (mips_tune == PROCESSOR_R3900)
346 #define TUNE_MIPS4000 (mips_tune == PROCESSOR_R4000)
347 #define TUNE_MIPS5000 (mips_tune == PROCESSOR_R5000)
348 #define TUNE_MIPS6000 (mips_tune == PROCESSOR_R6000)
350 /* Macro to define tables used to set the flags.
351 This is a list in braces of pairs in braces,
352 each pair being { "NAME", VALUE }
353 where VALUE is the bits to set or minus the bits to clear.
354 An empty string NAME is used to identify the default VALUE. */
356 #define TARGET_SWITCHES \
357 { \
467 NULL}, \
469 NULL}, \
471 NULL}, \
473 NULL}, \
475 NULL}, \
477 NULL}, \
479 NULL}, \
481 NULL}, \
483 NULL}, \
485 NULL}, \
487 | TARGET_CPU_DEFAULT \
488 | TARGET_ENDIAN_DEFAULT), \
489 NULL}, \
490 }
492 /* Default target_flags if no switches are specified */
494 #ifndef TARGET_DEFAULT
495 #define TARGET_DEFAULT 0
496 #endif
498 #ifndef TARGET_CPU_DEFAULT
499 #define TARGET_CPU_DEFAULT 0
500 #endif
502 #ifndef TARGET_ENDIAN_DEFAULT
503 #ifndef DECSTATION
504 #define TARGET_ENDIAN_DEFAULT MASK_BIG_ENDIAN
505 #else
506 #define TARGET_ENDIAN_DEFAULT 0
507 #endif
508 #endif
510 #ifndef MIPS_ISA_DEFAULT
511 #define MIPS_ISA_DEFAULT 1
512 #endif
514 #ifdef IN_LIBGCC2
515 #undef TARGET_64BIT
516 /* Make this compile time constant for libgcc2 */
517 #ifdef __mips64
518 #define TARGET_64BIT 1
519 #else
520 #define TARGET_64BIT 0
521 #endif
524 #ifndef MULTILIB_ENDIAN_DEFAULT
525 #if TARGET_ENDIAN_DEFAULT == 0
527 #else
529 #endif
530 #endif
532 #ifndef MULTILIB_ISA_DEFAULT
533 # if MIPS_ISA_DEFAULT == 1
535 # else
536 # if MIPS_ISA_DEFAULT == 2
538 # else
539 # if MIPS_ISA_DEFAULT == 3
541 # else
542 # if MIPS_ISA_DEFAULT == 4
544 # else
546 # endif
547 # endif
548 # endif
549 # endif
550 #endif
552 #ifndef MULTILIB_DEFAULTS
553 #define MULTILIB_DEFAULTS { MULTILIB_ENDIAN_DEFAULT, MULTILIB_ISA_DEFAULT }
554 #endif
556 /* We must pass -EL to the linker by default for little endian embedded
557 targets using linker scripts with a OUTPUT_FORMAT line. Otherwise, the
558 linker will default to using big-endian output files. The OUTPUT_FORMAT
559 line must be in the linker script, otherwise -EB/-EL will not work. */
561 #ifndef ENDIAN_SPEC
562 #if TARGET_ENDIAN_DEFAULT == 0
564 #else
566 #endif
567 #endif
569 /* This macro is similar to `TARGET_SWITCHES' but defines names of
570 command options that have values. Its definition is an
571 initializer with a subgrouping for each command option.
573 Each subgrouping contains a string constant, that defines the
574 fixed part of the option name, and the address of a variable.
575 The variable, type `char *', is set to the variable part of the
576 given option if the fixed part matches. The actual option name
577 is made by appending `-m' to the specified name.
579 Here is an example which defines `-mshort-data-NUMBER'. If the
580 given option is `-mshort-data-512', the variable `m88k_short_data'
581 will be set to the string `"512"'.
583 extern char *m88k_short_data;
584 #define TARGET_OPTIONS { { "short-data-", &m88k_short_data } } */
586 #define TARGET_OPTIONS \
587 { \
588 SUBTARGET_TARGET_OPTIONS \
602 NULL}, \
603 }
605 /* This is meant to be redefined in the host dependent files. */
606 #define SUBTARGET_TARGET_OPTIONS
608 #define GENERATE_BRANCHLIKELY (!TARGET_MIPS16 && ISA_HAS_BRANCHLIKELY)
610 /* Generate three-operand multiply instructions for both SImode and DImode. */
611 #define GENERATE_MULT3 (TARGET_MIPS3900 \
612 && !TARGET_MIPS16)
614 /* Macros to decide whether certain features are available or not,
615 depending on the instruction set architecture level. */
617 #define BRANCH_LIKELY_P() GENERATE_BRANCHLIKELY
618 #define HAVE_SQRT_P() (mips_isa != 1)
620 /* ISA has instructions for managing 64 bit fp and gp regs (eg. mips3). */
621 #define ISA_HAS_64BIT_REGS (mips_isa == 3 || mips_isa == 4 \
622 )
624 /* ISA has branch likely instructions (eg. mips2). */
625 /* Disable branchlikely for tx39 until compare rewrite. They haven't
626 been generated up to this point. */
627 #define ISA_HAS_BRANCHLIKELY (mips_isa != 1 \
630 /* ISA has the conditional move instructions introduced in mips4. */
631 #define ISA_HAS_CONDMOVE (mips_isa == 4 \
632 )
634 /* ISA has just the integer condition move instructions (movn,movz) */
635 #define ISA_HAS_INT_CONDMOVE 0
639 /* ISA has the mips4 FP condition code instructions: FP-compare to CC,
640 branch on CC, and move (both FP and non-FP) on CC. */
641 #define ISA_HAS_8CC (mips_isa == 4 \
642 )
645 /* This is a catch all for the other new mips4 instructions: indexed load and
646 indexed prefetch instructions, the FP madd,msub,nmadd, and nmsub instructions,
647 and the FP recip and recip sqrt instructions */
648 #define ISA_HAS_FP4 (mips_isa == 4 \
649 )
651 /* ISA has conditional trap instructions. */
652 #define ISA_HAS_COND_TRAP (mips_isa >= 2)
654 /* ISA has nmadd and nmsub instructions. */
655 #define ISA_HAS_NMADD_NMSUB (mips_isa == 4 \
656 )
658 /* CC1_SPEC causes -mips3 and -mips4 to set -mfp64 and -mgp64; -mips1 or
659 -mips2 sets -mfp32 and -mgp32. This can be overridden by an explicit
660 -mfp32, -mfp64, -mgp32 or -mgp64. -mfp64 sets MASK_FLOAT64 in
661 target_flags, and -mgp64 sets MASK_64BIT.
663 Setting MASK_64BIT in target_flags will cause gcc to assume that
664 registers are 64 bits wide. int, long and void * will be 32 bit;
665 this may be changed with -mint64 or -mlong64.
667 The gen* programs link code that refers to MASK_64BIT. They don't
668 actually use the information in target_flags; they just refer to
669 it. */
670 \f
671 /* Switch Recognition by gcc.c. Add -G xx support */
673 #ifdef SWITCH_TAKES_ARG
674 #undef SWITCH_TAKES_ARG
675 #endif
677 #define SWITCH_TAKES_ARG(CHAR) \
680 /* Sometimes certain combinations of command options do not make sense
681 on a particular target machine. You can define a macro
682 `OVERRIDE_OPTIONS' to take account of this. This macro, if
683 defined, is executed once just after all the command options have
684 been parsed.
686 On the MIPS, it is used to handle -G. We also use it to set up all
687 of the tables referenced in the other macros. */
689 #define OVERRIDE_OPTIONS override_options ()
691 /* Zero or more C statements that may conditionally modify two
692 variables `fixed_regs' and `call_used_regs' (both of type `char
693 []') after they have been initialized from the two preceding
694 macros.
696 This is necessary in case the fixed or call-clobbered registers
697 depend on target flags.
699 You need not define this macro if it has no work to do.
701 If the usage of an entire class of registers depends on the target
702 flags, you may indicate this to GCC by using this macro to modify
703 `fixed_regs' and `call_used_regs' to 1 for each of the registers in
704 the classes which should not be used by GCC. Also define the macro
705 `REG_CLASS_FROM_LETTER' to return `NO_REGS' if it is called with a
706 letter for a class that shouldn't be used.
708 (However, if this class is not included in `GENERAL_REGS' and all
709 of the insn patterns whose constraints permit this class are
710 controlled by target switches, then GCC will automatically avoid
711 using these registers when the target switches are opposed to
712 them.) */
714 #define CONDITIONAL_REGISTER_USAGE \
715 do \
716 { \
717 if (!TARGET_HARD_FLOAT) \
718 { \
719 int regno; \
720 \
721 for (regno = FP_REG_FIRST; regno <= FP_REG_LAST; regno++) \
722 fixed_regs[regno] = call_used_regs[regno] = 1; \
723 for (regno = ST_REG_FIRST; regno <= ST_REG_LAST; regno++) \
724 fixed_regs[regno] = call_used_regs[regno] = 1; \
725 } \
726 else if (! ISA_HAS_8CC) \
727 { \
728 int regno; \
729 \
730 /* We only have a single condition code register. We \
731 implement this by hiding all the condition code registers, \
733 for (regno = ST_REG_FIRST; regno <= ST_REG_LAST; regno++) \
734 fixed_regs[regno] = call_used_regs[regno] = 1; \
735 } \
736 /* In mips16 mode, we permit the $t temporary registers to be used \
737 for reload. We prohibit the unused $s registers, since they \
738 are caller saved, and saving them via a mips16 register would \
740 if (TARGET_MIPS16) \
741 { \
742 fixed_regs[18] = call_used_regs[18] = 1; \
743 fixed_regs[19] = call_used_regs[19] = 1; \
744 fixed_regs[20] = call_used_regs[20] = 1; \
745 fixed_regs[21] = call_used_regs[21] = 1; \
746 fixed_regs[22] = call_used_regs[22] = 1; \
747 fixed_regs[23] = call_used_regs[23] = 1; \
748 fixed_regs[26] = call_used_regs[26] = 1; \
749 fixed_regs[27] = call_used_regs[27] = 1; \
750 fixed_regs[30] = call_used_regs[30] = 1; \
751 } \
752 SUBTARGET_CONDITIONAL_REGISTER_USAGE \
753 } \
754 while (0)
756 /* This is meant to be redefined in the host dependent files. */
757 #define SUBTARGET_CONDITIONAL_REGISTER_USAGE
759 /* Show we can debug even without a frame pointer. */
760 #define CAN_DEBUG_WITHOUT_FP
761 \f
762 /* Complain about missing specs and predefines that should be defined in each
763 of the target tm files to override the defaults. This is mostly a place-
764 holder until I can get each of the files updated [mm]. */
766 #if defined(OSF_OS) \
767 || defined(DECSTATION) \
768 || defined(SGI_TARGET) \
769 || defined(MIPS_NEWS) \
770 || defined(MIPS_SYSV) \
771 || defined(MIPS_SVR4) \
772 || defined(MIPS_BSD43)
774 #ifndef CPP_PREDEFINES
776 #endif
778 #ifndef LIB_SPEC
780 #endif
782 #ifndef STARTFILE_SPEC
784 #endif
786 #ifndef MACHINE_TYPE
788 #endif
789 #endif
791 /* Tell collect what flags to pass to nm. */
792 #ifndef NM_FLAGS
794 #endif
796 \f
797 /* Names to predefine in the preprocessor for this target machine. */
799 #ifndef CPP_PREDEFINES
801 -D_mips -D_unix -D_host_mips -D_MIPSEB -D_R3000 -D_SYSTYPE_BSD43 \
802 -Asystem=unix -Asystem=bsd -Acpu=mips -Amachine=mips"
803 #endif
805 /* Assembler specs. */
807 /* MIPS_AS_ASM_SPEC is passed when using the MIPS assembler rather
808 than gas. */
811 %{!.s:-nocpp} %{.s: %{cpp} %{nocpp}} \
812 %{pipe: %e-pipe is not supported.} \
813 %{K} %(subtarget_mips_as_asm_spec)"
815 /* SUBTARGET_MIPS_AS_ASM_SPEC is passed when using the MIPS assembler
816 rather than gas. It may be overridden by subtargets. */
818 #ifndef SUBTARGET_MIPS_AS_ASM_SPEC
820 #endif
822 /* GAS_ASM_SPEC is passed when using gas, rather than the MIPS
823 assembler. */
825 #define GAS_ASM_SPEC "%{march=*} %{mtune=*} %{mcpu=*} %{m4650} %{mmad:-m4650} %{m3900} %{v} %{mgp32} %{mgp64}"
827 /* TARGET_ASM_SPEC is used to select either MIPS_AS_ASM_SPEC or
828 GAS_ASM_SPEC as the default, depending upon the value of
829 TARGET_DEFAULT. */
831 #if ((TARGET_CPU_DEFAULT | TARGET_DEFAULT) & MASK_GAS) != 0
832 /* GAS */
835 %{mmips-as: %(mips_as_asm_spec)} \
836 %{!mmips-as: %(gas_asm_spec)}"
841 %{!mgas: %(mips_as_asm_spec)} \
842 %{mgas: %(gas_asm_spec)}"
846 /* SUBTARGET_ASM_OPTIMIZING_SPEC handles passing optimization options
847 to the assembler. It may be overridden by subtargets. */
848 #ifndef SUBTARGET_ASM_OPTIMIZING_SPEC
850 %{noasmopt:-O0} \
851 %{!noasmopt:%{O:-O2} %{O1:-O2} %{O2:-O2} %{O3:-O3}}"
852 #endif
854 /* SUBTARGET_ASM_DEBUGGING_SPEC handles passing debugging options to
855 the assembler. It may be overridden by subtargets. */
856 #ifndef SUBTARGET_ASM_DEBUGGING_SPEC
858 %{g} %{g0} %{g1} %{g2} %{g3} \
859 %{ggdb:-g} %{ggdb0:-g0} %{ggdb1:-g1} %{ggdb2:-g2} %{ggdb3:-g3} \
860 %{gstabs:-g} %{gstabs0:-g0} %{gstabs1:-g1} %{gstabs2:-g2} %{gstabs3:-g3} \
861 %{gstabs+:-g} %{gstabs+0:-g0} %{gstabs+1:-g1} %{gstabs+2:-g2} %{gstabs+3:-g3} \
862 %{gcoff:-g} %{gcoff0:-g0} %{gcoff1:-g1} %{gcoff2:-g2} %{gcoff3:-g3}"
863 #endif
865 /* SUBTARGET_ASM_SPEC is always passed to the assembler. It may be
866 overridden by subtargets. */
868 #ifndef SUBTARGET_ASM_SPEC
870 #endif
872 /* ASM_SPEC is the set of arguments to pass to the assembler. */
874 #undef ASM_SPEC
876 %{!membedded-pic:%{G*}} %(endian_spec) %{mips1} %{mips2} %{mips3} %{mips4} \
877 %{mips16:%{!mno-mips16:-mips16}} %{mno-mips16:-no-mips16} \
878 %(subtarget_asm_optimizing_spec) \
879 %(subtarget_asm_debugging_spec) \
880 %{membedded-pic} \
881 %{mfix7000} \
882 %{mabi=32:-32}%{mabi=o32:-32}%{mabi=n32:-n32}%{mabi=64:-64}%{mabi=n64:-64} \
883 %(target_asm_spec) \
884 %(subtarget_asm_spec)"
886 /* Specify to run a post-processor, mips-tfile after the assembler
887 has run to stuff the mips debug information into the object file.
888 This is needed because the $#!%^ MIPS assembler provides no way
889 of specifying such information in the assembly file. If we are
890 cross compiling, disable mips-tfile unless the user specifies
891 -mmips-tfile. */
893 #ifndef ASM_FINAL_SPEC
894 #if ((TARGET_CPU_DEFAULT | TARGET_DEFAULT) & MASK_GAS) != 0
895 /* GAS */
897 %{mmips-as: %{!mno-mips-tfile: \
899 %{K: -I %b.o~} \
900 %{!K: %{save-temps: -I %b.o~}} \
901 %{c:%W{o*}%{!o*:-o %b.o}}%{!c:-o %U.o} \
902 %{.s:%i} %{!.s:%g.s}}}"
904 #else
905 /* not GAS */
907 %{!mgas: %{!mno-mips-tfile: \
909 %{K: -I %b.o~} \
910 %{!K: %{save-temps: -I %b.o~}} \
911 %{c:%W{o*}%{!o*:-o %b.o}}%{!c:-o %U.o} \
912 %{.s:%i} %{!.s:%g.s}}}"
914 #endif
917 /* Redefinition of libraries used. Mips doesn't support normal
918 UNIX style profiling via calling _mcount. It does offer
919 profiling that samples the PC, so do what we can... */
921 #ifndef LIB_SPEC
923 #endif
925 /* Extra switches sometimes passed to the linker. */
926 /* ??? The bestGnum will never be passed to the linker, because the gcc driver
927 will interpret it as a -b option. */
929 #ifndef LINK_SPEC
931 %(endian_spec) \
932 %{G*} %{mips1} %{mips2} %{mips3} %{mips4} \
933 %{bestGnum} %{shared} %{non_shared}"
936 /* Specs for the compiler proper */
938 /* SUBTARGET_CC1_SPEC is passed to the compiler proper. It may be
939 overridden by subtargets. */
940 #ifndef SUBTARGET_CC1_SPEC
942 #endif
944 /* Deal with historic options. */
945 #ifndef CC1_CPU_SPEC
947 %{!mcpu*: \
948 %{m3900:-march=r3900 -mips1 -mfp32 -mgp32 \
950 %{m4650:-march=r4650 -mmad -msingle-float \
952 #endif
954 /* CC1_SPEC is the set of arguments to pass to the compiler proper. */
956 #ifndef CC1_SPEC
958 %{gline:%{!g:%{!g0:%{!g1:%{!g2: -g1}}}}} \
959 %{mips1:-mfp32 -mgp32} %{mips2:-mfp32 -mgp32}\
960 %{mips3:%{!msingle-float:%{!m4650:-mfp64}} -mgp64} \
961 %{mips4:%{!msingle-float:%{!m4650:-mfp64}} -mgp64} \
962 %{mfp64:%{msingle-float:%emay not use both -mfp64 and -msingle-float}} \
963 %{mfp64:%{m4650:%emay not use both -mfp64 and -m4650}} \
964 %{mint64|mlong64|mlong32:-mexplicit-type-size }\
965 %{G*} %{EB:-meb} %{EL:-mel} %{EB:%{EL:%emay not use both -EB and -EL}} \
966 %{pic-none: -mno-half-pic} \
967 %{pic-lib: -mhalf-pic} \
968 %{pic-extern: -mhalf-pic} \
969 %{pic-calls: -mhalf-pic} \
970 %{save-temps: } \
971 %(subtarget_cc1_spec) \
972 %(cc1_cpu_spec)"
973 #endif
975 /* Preprocessor specs. */
977 /* SUBTARGET_CPP_SIZE_SPEC defines SIZE_TYPE and PTRDIFF_TYPE. It may
978 be overridden by subtargets. */
980 #ifndef SUBTARGET_CPP_SIZE_SPEC
982 %{mlong64:%{!mips1:%{!mips2:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}}} \
984 #endif
986 /* SUBTARGET_CPP_SPEC is passed to the preprocessor. It may be
987 overridden by subtargets. */
988 #ifndef SUBTARGET_CPP_SPEC
990 #endif
992 /* If we're using 64bit longs, then we have to define __LONG_MAX__
993 correctly. Similarly for 64bit ints and __INT_MAX__. */
994 #ifndef LONG_MAX_SPEC
995 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_LONG64)
997 #else
999 #endif
1000 #endif
1002 /* For C++ we need to ensure that _LANGUAGE_C_PLUS_PLUS is defined independent
1003 of the source file extension. */
1004 #undef CPLUSPLUS_CPP_SPEC
1006 -D__LANGUAGE_C_PLUS_PLUS -D_LANGUAGE_C_PLUS_PLUS \
1007 %(cpp) \
1008 "
1009 /* CPP_SPEC is the set of arguments to pass to the preprocessor. */
1011 #ifndef CPP_SPEC
1013 %{.m: -D__LANGUAGE_OBJECTIVE_C -D_LANGUAGE_OBJECTIVE_C -D__LANGUAGE_C -D_LANGUAGE_C} \
1014 %{.S|.s: -D__LANGUAGE_ASSEMBLY -D_LANGUAGE_ASSEMBLY %{!ansi:-DLANGUAGE_ASSEMBLY}} \
1015 %{!.S: %{!.s: %{!.cc: %{!.cxx: %{!.cpp: %{!.cp: %{!.c++: %{!.C: %{!.m: -D__LANGUAGE_C -D_LANGUAGE_C %{!ansi:-DLANGUAGE_C}}}}}}}}}} \
1016 %(subtarget_cpp_size_spec) \
1017 %{mips3:-U__mips -D__mips=3 -D__mips64} \
1018 %{mips4:-U__mips -D__mips=4 -D__mips64} \
1019 %{mgp32:-U__mips64} %{mgp64:-D__mips64} \
1020 %{msingle-float:%{!msoft-float:-D__mips_single_float}} \
1021 %{m4650:%{!msoft-float:-D__mips_single_float}} \
1022 %{msoft-float:-D__mips_soft_float} \
1023 %{mabi=eabi:-D__mips_eabi} \
1024 %{mips16:%{!mno-mips16:-D__mips16}} \
1025 %{EB:-UMIPSEL -U_MIPSEL -U__MIPSEL -U__MIPSEL__ -D_MIPSEB -D__MIPSEB -D__MIPSEB__ %{!ansi:-DMIPSEB}} \
1026 %{EL:-UMIPSEB -U_MIPSEB -U__MIPSEB -U__MIPSEB__ -D_MIPSEL -D__MIPSEL -D__MIPSEL__ %{!ansi:-DMIPSEL}} \
1027 %(long_max_spec) \
1028 %(subtarget_cpp_spec) "
1029 #endif
1031 /* This macro defines names of additional specifications to put in the specs
1032 that can be used in various specifications like CC1_SPEC. Its definition
1033 is an initializer with a subgrouping for each command option.
1035 Each subgrouping contains a string constant, that defines the
1036 specification name, and a string constant that used by the GNU CC driver
1037 program.
1039 Do not define this macro if it does not need to do anything. */
1041 #define EXTRA_SPECS \
1055 SUBTARGET_EXTRA_SPECS
1057 #ifndef SUBTARGET_EXTRA_SPECS
1058 #define SUBTARGET_EXTRA_SPECS
1059 #endif
1061 /* If defined, this macro is an additional prefix to try after
1062 `STANDARD_EXEC_PREFIX'. */
1064 #ifndef MD_EXEC_PREFIX
1066 #endif
1068 #ifndef MD_STARTFILE_PREFIX
1070 #endif
1072 \f
1073 /* Print subsidiary information on the compiler version in use. */
1077 #ifndef MACHINE_TYPE
1079 #endif
1081 #ifndef TARGET_VERSION_INTERNAL
1082 #define TARGET_VERSION_INTERNAL(STREAM) \
1084 #endif
1086 #ifndef TARGET_VERSION
1087 #define TARGET_VERSION TARGET_VERSION_INTERNAL (stderr)
1088 #endif
1090 \f
1096 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
1097 #endif
1099 /* By default, turn on GDB extensions. */
1100 #define DEFAULT_GDB_EXTENSIONS 1
1102 /* If we are passing smuggling stabs through the MIPS ECOFF object
1103 format, put a comment in front of the .stab<x> operation so
1104 that the MIPS assembler does not choke. The mips-tfile program
1105 will correctly put the stab into the object file. */
1111 /* Local compiler-generated symbols must have a prefix that the assembler
1112 understands. By default, this is $, although some targets (e.g.,
1113 NetBSD-ELF) need to override this. */
1115 #ifndef LOCAL_LABEL_PREFIX
1117 #endif
1119 /* By default on the mips, external symbols do not have an underscore
1120 prepended, but some targets (e.g., NetBSD) require this. */
1122 #ifndef USER_LABEL_PREFIX
1124 #endif
1126 /* Forward references to tags are allowed. */
1127 #define SDB_ALLOW_FORWARD_REFERENCES
1129 /* Unknown tags are also allowed. */
1130 #define SDB_ALLOW_UNKNOWN_REFERENCES
1132 /* On Sun 4, this limit is 2048. We use 1500 to be safe,
1133 since the length can run past this up to a continuation point. */
1134 #undef DBX_CONTIN_LENGTH
1135 #define DBX_CONTIN_LENGTH 1500
1137 /* How to renumber registers for dbx and gdb. */
1138 #define DBX_REGISTER_NUMBER(REGNO) mips_dbx_regno[ (REGNO) ]
1140 /* The mapping from gcc register number to DWARF 2 CFA column number.
1141 This mapping does not allow for tracking register 0, since SGI's broken
1142 dwarf reader thinks column 0 is used for the frame address, but since
1143 register 0 is fixed this is not a problem. */
1144 #define DWARF_FRAME_REGNUM(REG) \
1145 (REG == GP_REG_FIRST + 31 ? DWARF_FRAME_RETURN_COLUMN : REG)
1147 /* The DWARF 2 CFA column which tracks the return address. */
1148 #define DWARF_FRAME_RETURN_COLUMN (FP_REG_LAST + 1)
1150 /* Before the prologue, RA lives in r31. */
1151 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (VOIDmode, GP_REG_FIRST + 31)
1153 /* Describe how we implement __builtin_eh_return. */
1154 #define EH_RETURN_DATA_REGNO(N) ((N) < 4 ? (N) + GP_ARG_FIRST : INVALID_REGNUM)
1155 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, GP_REG_FIRST + 3)
1157 /* Offsets recorded in opcodes are a multiple of this alignment factor.
1158 The default for this in 64-bit mode is 8, which causes problems with
1159 SFmode register saves. */
1160 #define DWARF_CIE_DATA_ALIGNMENT 4
1162 /* Overrides for the COFF debug format. */
1163 #define PUT_SDB_SCL(a) \
1164 do { \
1165 extern FILE *asm_out_text_file; \
1167 } while (0)
1169 #define PUT_SDB_INT_VAL(a) \
1170 do { \
1171 extern FILE *asm_out_text_file; \
1173 } while (0)
1175 #define PUT_SDB_VAL(a) \
1176 do { \
1177 extern FILE *asm_out_text_file; \
1179 output_addr_const (asm_out_text_file, (a)); \
1181 } while (0)
1183 #define PUT_SDB_DEF(a) \
1184 do { \
1185 extern FILE *asm_out_text_file; \
1188 ASM_OUTPUT_LABELREF (asm_out_text_file, a); \
1190 } while (0)
1192 #define PUT_SDB_PLAIN_DEF(a) \
1193 do { \
1194 extern FILE *asm_out_text_file; \
1197 } while (0)
1199 #define PUT_SDB_ENDEF \
1200 do { \
1201 extern FILE *asm_out_text_file; \
1203 } while (0)
1205 #define PUT_SDB_TYPE(a) \
1206 do { \
1207 extern FILE *asm_out_text_file; \
1209 } while (0)
1211 #define PUT_SDB_SIZE(a) \
1212 do { \
1213 extern FILE *asm_out_text_file; \
1215 } while (0)
1217 #define PUT_SDB_DIM(a) \
1218 do { \
1219 extern FILE *asm_out_text_file; \
1221 } while (0)
1223 #ifndef PUT_SDB_START_DIM
1224 #define PUT_SDB_START_DIM \
1225 do { \
1226 extern FILE *asm_out_text_file; \
1228 } while (0)
1229 #endif
1231 #ifndef PUT_SDB_NEXT_DIM
1232 #define PUT_SDB_NEXT_DIM(a) \
1233 do { \
1234 extern FILE *asm_out_text_file; \
1236 } while (0)
1237 #endif
1239 #ifndef PUT_SDB_LAST_DIM
1240 #define PUT_SDB_LAST_DIM(a) \
1241 do { \
1242 extern FILE *asm_out_text_file; \
1244 } while (0)
1245 #endif
1247 #define PUT_SDB_TAG(a) \
1248 do { \
1249 extern FILE *asm_out_text_file; \
1251 ASM_OUTPUT_LABELREF (asm_out_text_file, a); \
1253 } while (0)
1255 /* For block start and end, we create labels, so that
1256 later we can figure out where the correct offset is.
1257 The normal .ent/.end serve well enough for functions,
1258 so those are just commented out. */
1260 #define PUT_SDB_BLOCK_START(LINE) \
1261 do { \
1262 extern FILE *asm_out_text_file; \
1263 fprintf (asm_out_text_file, \
1265 LOCAL_LABEL_PREFIX, \
1266 sdb_label_count, \
1268 LOCAL_LABEL_PREFIX, \
1269 sdb_label_count, \
1270 (LINE)); \
1271 sdb_label_count++; \
1272 } while (0)
1274 #define PUT_SDB_BLOCK_END(LINE) \
1275 do { \
1276 extern FILE *asm_out_text_file; \
1277 fprintf (asm_out_text_file, \
1279 LOCAL_LABEL_PREFIX, \
1280 sdb_label_count, \
1282 LOCAL_LABEL_PREFIX, \
1283 sdb_label_count, \
1284 (LINE)); \
1285 sdb_label_count++; \
1286 } while (0)
1288 #define PUT_SDB_FUNCTION_START(LINE)
1290 #define PUT_SDB_FUNCTION_END(LINE) \
1291 do { \
1292 extern FILE *asm_out_text_file; \
1293 ASM_OUTPUT_SOURCE_LINE (asm_out_text_file, LINE + sdb_begin_function_line); \
1294 } while (0)
1296 #define PUT_SDB_EPILOGUE_END(NAME)
1298 #define PUT_SDB_SRC_FILE(FILENAME) \
1299 do { \
1300 extern FILE *asm_out_text_file; \
1301 output_file_directive (asm_out_text_file, (FILENAME)); \
1302 } while (0)
1304 #define SDB_GENERATE_FAKE(BUFFER, NUMBER) \
1307 /* Correct the offset of automatic variables and arguments. Note that
1308 the MIPS debug format wants all automatic variables and arguments
1309 to be in terms of the virtual frame pointer (stack pointer before
1310 any adjustment in the function), while the MIPS 3.0 linker wants
1311 the frame pointer to be the stack pointer after the initial
1312 adjustment. */
1314 #define DEBUGGER_AUTO_OFFSET(X) \
1315 mips_debugger_offset (X, (HOST_WIDE_INT) 0)
1316 #define DEBUGGER_ARG_OFFSET(OFFSET, X) \
1317 mips_debugger_offset (X, (HOST_WIDE_INT) OFFSET)
1319 /* Tell collect that the object format is ECOFF */
1320 #ifndef OBJECT_FORMAT_ROSE
1323 #endif
1324 \f
1325 /* Target machine storage layout */
1327 /* Define in order to support both big and little endian float formats
1328 in the same gcc binary. */
1329 #define REAL_ARITHMETIC
1331 /* Define this if most significant bit is lowest numbered
1332 in instructions that operate on numbered bit-fields.
1333 */
1334 #define BITS_BIG_ENDIAN 0
1336 /* Define this if most significant byte of a word is the lowest numbered. */
1337 #define BYTES_BIG_ENDIAN (TARGET_BIG_ENDIAN != 0)
1339 /* Define this if most significant word of a multiword number is the lowest. */
1340 #define WORDS_BIG_ENDIAN (TARGET_BIG_ENDIAN != 0)
1342 /* Define this to set the endianness to use in libgcc2.c, which can
1343 not depend on target_flags. */
1344 #if !defined(MIPSEL) && !defined(__MIPSEL__)
1345 #define LIBGCC2_WORDS_BIG_ENDIAN 1
1346 #else
1347 #define LIBGCC2_WORDS_BIG_ENDIAN 0
1348 #endif
1350 /* Number of bits in an addressable storage unit */
1351 #define BITS_PER_UNIT 8
1353 /* Width in bits of a "word", which is the contents of a machine register.
1354 Note that this is not necessarily the width of data type `int';
1355 if using 16-bit ints on a 68000, this would still be 32.
1356 But on a machine with 16-bit registers, this would be 16. */
1357 #define BITS_PER_WORD (TARGET_64BIT ? 64 : 32)
1358 #define MAX_BITS_PER_WORD 64
1360 /* Width of a word, in units (bytes). */
1361 #define UNITS_PER_WORD (TARGET_64BIT ? 8 : 4)
1362 #define MIN_UNITS_PER_WORD 4
1364 /* For MIPS, width of a floating point register. */
1365 #define UNITS_PER_FPREG (TARGET_FLOAT64 ? 8 : 4)
1367 /* A C expression for the size in bits of the type `int' on the
1368 target machine. If you don't define this, the default is one
1369 word. */
1370 #define INT_TYPE_SIZE (TARGET_INT64 ? 64 : 32)
1371 #define MAX_INT_TYPE_SIZE 64
1373 /* Tell the preprocessor the maximum size of wchar_t. */
1374 #ifndef MAX_WCHAR_TYPE_SIZE
1375 #ifndef WCHAR_TYPE_SIZE
1376 #define MAX_WCHAR_TYPE_SIZE MAX_INT_TYPE_SIZE
1377 #endif
1378 #endif
1380 /* A C expression for the size in bits of the type `short' on the
1381 target machine. If you don't define this, the default is half a
1382 word. (If this would be less than one storage unit, it is
1383 rounded up to one unit.) */
1384 #define SHORT_TYPE_SIZE 16
1386 /* A C expression for the size in bits of the type `long' on the
1387 target machine. If you don't define this, the default is one
1388 word. */
1389 #define LONG_TYPE_SIZE (TARGET_LONG64 ? 64 : 32)
1390 #define MAX_LONG_TYPE_SIZE 64
1392 /* A C expression for the size in bits of the type `long long' on the
1393 target machine. If you don't define this, the default is two
1394 words. */
1395 #define LONG_LONG_TYPE_SIZE 64
1397 /* A C expression for the size in bits of the type `char' on the
1398 target machine. If you don't define this, the default is one
1399 quarter of a word. (If this would be less than one storage unit,
1400 it is rounded up to one unit.) */
1401 #define CHAR_TYPE_SIZE BITS_PER_UNIT
1403 /* A C expression for the size in bits of the type `float' on the
1404 target machine. If you don't define this, the default is one
1405 word. */
1406 #define FLOAT_TYPE_SIZE 32
1408 /* A C expression for the size in bits of the type `double' on the
1409 target machine. If you don't define this, the default is two
1410 words. */
1411 #define DOUBLE_TYPE_SIZE 64
1413 /* A C expression for the size in bits of the type `long double' on
1414 the target machine. If you don't define this, the default is two
1415 words. */
1416 #define LONG_DOUBLE_TYPE_SIZE 64
1418 /* Width in bits of a pointer.
1419 See also the macro `Pmode' defined below. */
1420 #ifndef POINTER_SIZE
1421 #define POINTER_SIZE (Pmode == DImode ? 64 : 32)
1422 #endif
1424 /* Allocation boundary (in *bits*) for storing pointers in memory. */
1425 #define POINTER_BOUNDARY (Pmode == DImode ? 64 : 32)
1427 /* Allocation boundary (in *bits*) for storing arguments in argument list. */
1428 #define PARM_BOUNDARY (TARGET_64BIT ? 64 : 32)
1430 /* Allocation boundary (in *bits*) for the code of a function. */
1431 #define FUNCTION_BOUNDARY 32
1433 /* Alignment of field after `int : 0' in a structure. */
1434 #define EMPTY_FIELD_BOUNDARY 32
1436 /* Every structure's size must be a multiple of this. */
1437 /* 8 is observed right on a DECstation and on riscos 4.02. */
1438 #define STRUCTURE_SIZE_BOUNDARY 8
1440 /* There is no point aligning anything to a rounder boundary than this. */
1441 #define BIGGEST_ALIGNMENT 64
1443 /* Set this nonzero if move instructions will actually fail to work
1444 when given unaligned data. */
1445 #define STRICT_ALIGNMENT 1
1447 /* Define this if you wish to imitate the way many other C compilers
1448 handle alignment of bitfields and the structures that contain
1449 them.
1451 The behavior is that the type written for a bitfield (`int',
1452 `short', or other integer type) imposes an alignment for the
1453 entire structure, as if the structure really did contain an
1454 ordinary field of that type. In addition, the bitfield is placed
1455 within the structure so that it would fit within such a field,
1456 not crossing a boundary for it.
1458 Thus, on most machines, a bitfield whose type is written as `int'
1459 would not cross a four-byte boundary, and would force four-byte
1460 alignment for the whole structure. (The alignment used may not
1461 be four bytes; it is controlled by the other alignment
1462 parameters.)
1464 If the macro is defined, its definition should be a C expression;
1465 a nonzero value for the expression enables this behavior. */
1467 #define PCC_BITFIELD_TYPE_MATTERS 1
1469 /* If defined, a C expression to compute the alignment given to a
1470 constant that is being placed in memory. CONSTANT is the constant
1471 and ALIGN is the alignment that the object would ordinarily have.
1472 The value of this macro is used instead of that alignment to align
1473 the object.
1475 If this macro is not defined, then ALIGN is used.
1477 The typical use of this macro is to increase alignment for string
1478 constants to be word aligned so that `strcpy' calls that copy
1479 constants can be done inline. */
1481 #define CONSTANT_ALIGNMENT(EXP, ALIGN) \
1482 ((TREE_CODE (EXP) == STRING_CST || TREE_CODE (EXP) == CONSTRUCTOR) \
1483 && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
1485 /* If defined, a C expression to compute the alignment for a static
1486 variable. TYPE is the data type, and ALIGN is the alignment that
1487 the object would ordinarily have. The value of this macro is used
1488 instead of that alignment to align the object.
1490 If this macro is not defined, then ALIGN is used.
1492 One use of this macro is to increase alignment of medium-size
1493 data to make it all fit in fewer cache lines. Another is to
1494 cause character arrays to be word-aligned so that `strcpy' calls
1495 that copy constants to character arrays can be done inline. */
1497 #undef DATA_ALIGNMENT
1498 #define DATA_ALIGNMENT(TYPE, ALIGN) \
1499 ((((ALIGN) < BITS_PER_WORD) \
1500 && (TREE_CODE (TYPE) == ARRAY_TYPE \
1501 || TREE_CODE (TYPE) == UNION_TYPE \
1502 || TREE_CODE (TYPE) == RECORD_TYPE)) ? BITS_PER_WORD : (ALIGN))
1505 /* Force right-alignment for small varargs in 32 bit little_endian mode */
1507 #define PAD_VARARGS_DOWN (TARGET_64BIT ? BYTES_BIG_ENDIAN : !BYTES_BIG_ENDIAN)
1509 /* Define this macro if an argument declared as `char' or `short' in a
1510 prototype should actually be passed as an `int'. In addition to
1511 avoiding errors in certain cases of mismatch, it also makes for
1512 better code on certain machines. */
1514 #define PROMOTE_PROTOTYPES 1
1516 /* Define if operations between registers always perform the operation
1517 on the full register even if a narrower mode is specified. */
1518 #define WORD_REGISTER_OPERATIONS
1520 /* Define if loading in MODE, an integral mode narrower than BITS_PER_WORD
1521 will either zero-extend or sign-extend. The value of this macro should
1522 be the code that says which one of the two operations is implicitly
1523 done, NIL if none.
1525 When in 64 bit mode, mips_move_1word will sign extend SImode and CCmode
1526 moves. All other referces are zero extended. */
1527 #define LOAD_EXTEND_OP(MODE) \
1528 (TARGET_64BIT && ((MODE) == SImode || (MODE) == CCmode) \
1529 ? SIGN_EXTEND : ZERO_EXTEND)
1531 /* Define this macro if it is advisable to hold scalars in registers
1532 in a wider mode than that declared by the program. In such cases,
1533 the value is constrained to be within the bounds of the declared
1534 type, but kept valid in the wider mode. The signedness of the
1535 extension may differ from that of the type.
1537 We promote any value smaller than SImode up to SImode. We don't
1538 want to promote to DImode when in 64 bit mode, because that would
1539 prevent us from using the faster SImode multiply and divide
1540 instructions. */
1542 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE) \
1543 if (GET_MODE_CLASS (MODE) == MODE_INT \
1544 && GET_MODE_SIZE (MODE) < 4) \
1545 (MODE) = SImode;
1547 /* Define this if function arguments should also be promoted using the above
1548 procedure. */
1550 #define PROMOTE_FUNCTION_ARGS
1552 /* Likewise, if the function return value is promoted. */
1554 #define PROMOTE_FUNCTION_RETURN
1555 \f
1556 /* Standard register usage. */
1558 /* Number of actual hardware registers.
1559 The hardware registers are assigned numbers for the compiler
1560 from 0 to just below FIRST_PSEUDO_REGISTER.
1561 All registers that the compiler knows about must be given numbers,
1562 even those that are not normally considered general registers.
1564 On the Mips, we have 32 integer registers, 32 floating point
1565 registers, 8 condition code registers, and the special registers
1566 hi, lo, hilo, and rap. The 8 condition code registers are only
1567 used if mips_isa >= 4. The hilo register is only used in 64 bit
1568 mode. It represents a 64 bit value stored as two 32 bit values in
1569 the hi and lo registers; this is the result of the mult
1570 instruction. rap is a pointer to the stack where the return
1571 address reg ($31) was stored. This is needed for C++ exception
1572 handling. */
1574 #define FIRST_PSEUDO_REGISTER 76
1576 /* 1 for registers that have pervasive standard uses
1577 and are not available for the register allocator.
1579 On the MIPS, see conventions, page D-2 */
1581 #define FIXED_REGISTERS \
1582 { \
1583 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
1584 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, \
1585 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
1586 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
1587 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 \
1588 }
1591 /* 1 for registers not available across function calls.
1592 These must include the FIXED_REGISTERS and also any
1593 registers that can be used without being saved.
1594 The latter must include the registers where values are returned
1595 and the register where structure-value addresses are passed.
1596 Aside from that, you can include as many other registers as you like. */
1598 #define CALL_USED_REGISTERS \
1599 { \
1600 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
1601 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, \
1602 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
1603 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
1604 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 \
1605 }
1608 /* Internal macros to classify a register number as to whether it's a
1609 general purpose register, a floating point register, a
1610 multiply/divide register, or a status register. */
1612 #define GP_REG_FIRST 0
1613 #define GP_REG_LAST 31
1614 #define GP_REG_NUM (GP_REG_LAST - GP_REG_FIRST + 1)
1615 #define GP_DBX_FIRST 0
1617 #define FP_REG_FIRST 32
1618 #define FP_REG_LAST 63
1619 #define FP_REG_NUM (FP_REG_LAST - FP_REG_FIRST + 1)
1620 #define FP_DBX_FIRST ((write_symbols == DBX_DEBUG) ? 38 : 32)
1622 #define MD_REG_FIRST 64
1623 #define MD_REG_LAST 66
1624 #define MD_REG_NUM (MD_REG_LAST - MD_REG_FIRST + 1)
1626 #define ST_REG_FIRST 67
1627 #define ST_REG_LAST 74
1628 #define ST_REG_NUM (ST_REG_LAST - ST_REG_FIRST + 1)
1630 #define RAP_REG_NUM 75
1632 #define AT_REGNUM (GP_REG_FIRST + 1)
1633 #define HI_REGNUM (MD_REG_FIRST + 0)
1634 #define LO_REGNUM (MD_REG_FIRST + 1)
1635 #define HILO_REGNUM (MD_REG_FIRST + 2)
1637 /* FPSW_REGNUM is the single condition code used if mips_isa < 4. If
1638 mips_isa >= 4, it should not be used, and an arbitrary ST_REG
1639 should be used instead. */
1640 #define FPSW_REGNUM ST_REG_FIRST
1642 #define GP_REG_P(REGNO) \
1643 ((unsigned int) ((int) (REGNO) - GP_REG_FIRST) < GP_REG_NUM)
1644 #define M16_REG_P(REGNO) \
1645 (((REGNO) >= 2 && (REGNO) <= 7) || (REGNO) == 16 || (REGNO) == 17)
1646 #define FP_REG_P(REGNO) \
1647 ((unsigned int) ((int) (REGNO) - FP_REG_FIRST) < FP_REG_NUM)
1648 #define MD_REG_P(REGNO) \
1649 ((unsigned int) ((int) (REGNO) - MD_REG_FIRST) < MD_REG_NUM)
1650 #define ST_REG_P(REGNO) \
1651 ((unsigned int) ((int) (REGNO) - ST_REG_FIRST) < ST_REG_NUM)
1653 /* Return number of consecutive hard regs needed starting at reg REGNO
1654 to hold something of mode MODE.
1655 This is ordinarily the length in words of a value of mode MODE
1656 but can be less for certain modes in special long registers.
1658 On the MIPS, all general registers are one word long. Except on
1659 the R4000 with the FR bit set, the floating point uses register
1660 pairs, with the second register not being allocable. */
1662 #define HARD_REGNO_NREGS(REGNO, MODE) \
1663 (! FP_REG_P (REGNO) \
1664 ? ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) \
1665 : ((GET_MODE_SIZE (MODE) + UNITS_PER_FPREG - 1) / UNITS_PER_FPREG))
1667 /* Value is 1 if hard register REGNO can hold a value of machine-mode
1668 MODE. In 32 bit mode, require that DImode and DFmode be in even
1669 registers. For DImode, this makes some of the insns easier to
1670 write, since you don't have to worry about a DImode value in
1671 registers 3 & 4, producing a result in 4 & 5.
1673 To make the code simpler HARD_REGNO_MODE_OK now just references an
1674 array built in override_options. Because machmodes.h is not yet
1675 included before this file is processed, the MODE bound can't be
1676 expressed here. */
1680 #define HARD_REGNO_MODE_OK(REGNO, MODE) \
1681 mips_hard_regno_mode_ok[ (int)(MODE) ][ (REGNO) ]
1683 /* Value is 1 if it is a good idea to tie two pseudo registers
1684 when one has mode MODE1 and one has mode MODE2.
1685 If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
1686 for any hard reg, then this must be 0 for correct output. */
1687 #define MODES_TIEABLE_P(MODE1, MODE2) \
1688 ((GET_MODE_CLASS (MODE1) == MODE_FLOAT || \
1689 GET_MODE_CLASS (MODE1) == MODE_COMPLEX_FLOAT) \
1690 == (GET_MODE_CLASS (MODE2) == MODE_FLOAT || \
1691 GET_MODE_CLASS (MODE2) == MODE_COMPLEX_FLOAT))
1693 /* MIPS pc is not overloaded on a register. */
1694 /* #define PC_REGNUM xx */
1696 /* Register to use for pushing function arguments. */
1697 #define STACK_POINTER_REGNUM (GP_REG_FIRST + 29)
1699 /* Offset from the stack pointer to the first available location. Use
1700 the default value zero. */
1701 /* #define STACK_POINTER_OFFSET 0 */
1703 /* Base register for access to local variables of the function. We
1704 pretend that the frame pointer is $1, and then eliminate it to
1705 HARD_FRAME_POINTER_REGNUM. We can get away with this because $1 is
1706 a fixed register, and will not be used for anything else. */
1707 #define FRAME_POINTER_REGNUM (GP_REG_FIRST + 1)
1709 /* Temporary scratch register for use by the assembler. */
1710 #define ASSEMBLER_SCRATCH_REGNUM (GP_REG_FIRST + 1)
1712 /* $30 is not available on the mips16, so we use $17 as the frame
1713 pointer. */
1714 #define HARD_FRAME_POINTER_REGNUM \
1715 (TARGET_MIPS16 ? GP_REG_FIRST + 17 : GP_REG_FIRST + 30)
1717 /* Value should be nonzero if functions must have frame pointers.
1718 Zero means the frame pointer need not be set up (and parms
1719 may be accessed via the stack pointer) in functions that seem suitable.
1720 This is computed in `reload', in reload1.c. */
1721 #define FRAME_POINTER_REQUIRED (current_function_calls_alloca)
1723 /* Base register for access to arguments of the function. */
1724 #define ARG_POINTER_REGNUM GP_REG_FIRST
1726 /* Fake register that holds the address on the stack of the
1727 current function's return address. */
1728 #define RETURN_ADDRESS_POINTER_REGNUM RAP_REG_NUM
1730 /* Register in which static-chain is passed to a function. */
1731 #define STATIC_CHAIN_REGNUM (GP_REG_FIRST + 2)
1733 /* If the structure value address is passed in a register, then
1734 `STRUCT_VALUE_REGNUM' should be the number of that register. */
1735 /* #define STRUCT_VALUE_REGNUM (GP_REG_FIRST + 4) */
1737 /* If the structure value address is not passed in a register, define
1738 `STRUCT_VALUE' as an expression returning an RTX for the place
1739 where the address is passed. If it returns 0, the address is
1740 passed as an "invisible" first argument. */
1741 #define STRUCT_VALUE 0
1743 /* Mips registers used in prologue/epilogue code when the stack frame
1744 is larger than 32K bytes. These registers must come from the
1745 scratch register set, and not used for passing and returning
1746 arguments and any other information used in the calling sequence
1747 (such as pic). Must start at 12, since t0/t3 are parameter passing
1748 registers in the 64 bit ABI. */
1750 #define MIPS_TEMP1_REGNUM (GP_REG_FIRST + 12)
1751 #define MIPS_TEMP2_REGNUM (GP_REG_FIRST + 13)
1753 /* Define this macro if it is as good or better to call a constant
1754 function address than to call an address kept in a register. */
1755 #define NO_FUNCTION_CSE 1
1757 /* Define this macro if it is as good or better for a function to
1758 call itself with an explicit address than to call an address
1759 kept in a register. */
1760 #define NO_RECURSIVE_FUNCTION_CSE 1
1762 /* The register number of the register used to address a table of
1763 static data addresses in memory. In some cases this register is
1764 defined by a processor's "application binary interface" (ABI).
1765 When this macro is defined, RTL is generated for this register
1766 once, as with the stack pointer and frame pointer registers. If
1767 this macro is not defined, it is up to the machine-dependent
1768 files to allocate such a register (if necessary). */
1769 #define PIC_OFFSET_TABLE_REGNUM (GP_REG_FIRST + 28)
1771 #define PIC_FUNCTION_ADDR_REGNUM (GP_REG_FIRST + 25)
1773 /* Initialize embedded_pic_fnaddr_rtx before RTL generation for
1774 each function. We used to do this in FINALIZE_PIC, but FINALIZE_PIC
1775 isn't always called for static inline functions. */
1776 #define INIT_EXPANDERS \
1777 do { \
1778 embedded_pic_fnaddr_rtx = NULL; \
1779 mips16_gp_pseudo_rtx = NULL; \
1780 } while (0)
1781 \f
1782 /* Define the classes of registers for register constraints in the
1783 machine description. Also define ranges of constants.
1785 One of the classes must always be named ALL_REGS and include all hard regs.
1786 If there is more than one class, another class must be named NO_REGS
1787 and contain no registers.
1789 The name GENERAL_REGS must be the name of a class (or an alias for
1790 another name such as ALL_REGS). This is the class of registers
1791 that is allowed by "g" or "r" in a register constraint.
1792 Also, registers outside this class are allocated only when
1793 instructions express preferences for them.
1795 The classes must be numbered in nondecreasing order; that is,
1796 a larger-numbered class must never be contained completely
1797 in a smaller-numbered class.
1799 For any two classes, it is very desirable that there be another
1800 class that represents their union. */
1802 enum reg_class
1803 {
1816 LO_AND_GR_REGS,
1817 HILO_AND_GR_REGS,
1820 LIM_REG_CLASSES /* max value + 1 */
1821 };
1823 #define N_REG_CLASSES (int) LIM_REG_CLASSES
1825 #define GENERAL_REGS GR_REGS
1827 /* An initializer containing the names of the register classes as C
1828 string constants. These names are used in writing some of the
1829 debugging dumps. */
1831 #define REG_CLASS_NAMES \
1832 { \
1849 }
1851 /* An initializer containing the contents of the register classes,
1852 as integers which are bit masks. The Nth integer specifies the
1853 contents of class N. The way the integer MASK is interpreted is
1854 that register R is in the class if `MASK & (1 << R)' is 1.
1856 When the machine has more than 32 registers, an integer does not
1857 suffice. Then the integers are replaced by sub-initializers,
1858 braced groupings containing several integers. Each
1859 sub-initializer must be suitable as an initializer for the type
1860 `HARD_REG_SET' which is defined in `hard-reg-set.h'. */
1862 #define REG_CLASS_CONTENTS \
1863 { \
1876 { 0xffffffff, 0x00000000, 0x00000002 }, \
1877 { 0xffffffff, 0x00000000, 0x00000004 }, \
1880 }
1883 /* A C expression whose value is a register class containing hard
1884 register REGNO. In general there is more that one such class;
1885 choose a class which is "minimal", meaning that no smaller class
1886 also contains the register. */
1890 #define REGNO_REG_CLASS(REGNO) mips_regno_to_class[ (REGNO) ]
1892 /* A macro whose definition is the name of the class to which a
1893 valid base register must belong. A base register is one used in
1894 an address which is the register value plus a displacement. */
1896 #define BASE_REG_CLASS (TARGET_MIPS16 ? M16_REGS : GR_REGS)
1898 /* A macro whose definition is the name of the class to which a
1899 valid index register must belong. An index register is one used
1900 in an address where its value is either multiplied by a scale
1901 factor or added to another register (as well as added to a
1902 displacement). */
1904 #define INDEX_REG_CLASS NO_REGS
1906 /* When SMALL_REGISTER_CLASSES is nonzero, the compiler allows
1907 registers explicitly used in the rtl to be used as spill registers
1908 but prevents the compiler from extending the lifetime of these
1909 registers. */
1911 #define SMALL_REGISTER_CLASSES (TARGET_MIPS16)
1913 /* This macro is used later on in the file. */
1914 #define GR_REG_CLASS_P(CLASS) \
1915 ((CLASS) == GR_REGS || (CLASS) == M16_REGS || (CLASS) == T_REG \
1916 || (CLASS) == M16_T_REGS || (CLASS) == M16_NA_REGS)
1918 /* REG_ALLOC_ORDER is to order in which to allocate registers. This
1919 is the default value (allocate the registers in numeric order). We
1920 define it just so that we can override it for the mips16 target in
1921 ORDER_REGS_FOR_LOCAL_ALLOC. */
1923 #define REG_ALLOC_ORDER \
1924 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, \
1925 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, \
1926 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, \
1927 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, \
1928 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75 \
1929 }
1931 /* ORDER_REGS_FOR_LOCAL_ALLOC is a macro which permits reg_alloc_order
1932 to be rearranged based on a particular function. On the mips16, we
1933 want to allocate $24 (T_REG) before other registers for
1934 instructions for which it is possible. */
1936 #define ORDER_REGS_FOR_LOCAL_ALLOC mips_order_regs_for_local_alloc ()
1938 /* REGISTER AND CONSTANT CLASSES */
1940 /* Get reg_class from a letter such as appears in the machine
1941 description.
1943 DEFINED REGISTER CLASSES:
1945 'd' General (aka integer) registers
1946 Normally this is GR_REGS, but in mips16 mode this is M16_REGS
1947 'y' General registers (in both mips16 and non mips16 mode)
1948 'e' mips16 non argument registers (M16_NA_REGS)
1949 't' mips16 temporary register ($24)
1950 'f' Floating point registers
1951 'h' Hi register
1952 'l' Lo register
1953 'x' Multiply/divide registers
1954 'a' HILO_REG
1955 'z' FP Status register
1956 'b' All registers */
1960 #define REG_CLASS_FROM_LETTER(C) mips_char_to_class[(unsigned char)(C)]
1962 /* The letters I, J, K, L, M, N, O, and P in a register constraint
1963 string can be used to stand for particular ranges of immediate
1964 operands. This macro defines what the ranges are. C is the
1965 letter, and VALUE is a constant value. Return 1 if VALUE is
1966 in the range specified by C. */
1968 /* For MIPS:
1970 `I' is used for the range of constants an arithmetic insn can
1971 actually contain (16 bits signed integers).
1973 `J' is used for the range which is just zero (ie, $r0).
1975 `K' is used for the range of constants a logical insn can actually
1976 contain (16 bit zero-extended integers).
1978 `L' is used for the range of constants that be loaded with lui
1979 (ie, the bottom 16 bits are zero).
1981 `M' is used for the range of constants that take two words to load
1982 (ie, not matched by `I', `K', and `L').
1984 `N' is used for negative 16 bit constants other than -65536.
1986 `O' is a 15 bit signed integer.
1988 `P' is used for positive 16 bit constants. */
1990 #define SMALL_INT(X) ((unsigned HOST_WIDE_INT) (INTVAL (X) + 0x8000) < 0x10000)
1991 #define SMALL_INT_UNSIGNED(X) ((unsigned HOST_WIDE_INT) (INTVAL (X)) < 0x10000)
1993 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
1998 && (((VALUE) & ~2147483647) == 0 \
1999 || ((VALUE) & ~2147483647) == ~2147483647)) \
2001 && (((VALUE) & ~0x0000ffff) != ~0x0000ffff) \
2002 && (((VALUE) & 0x0000ffff) != 0 \
2003 || (((VALUE) & ~2147483647) != 0 \
2004 && ((VALUE) & ~2147483647) != ~2147483647))) \
2008 : 0)
2010 /* Similar, but for floating constants, and defining letters G and H.
2011 Here VALUE is the CONST_DOUBLE rtx itself. */
2013 /* For Mips
2015 'G' : Floating point 0 */
2017 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) \
2019 && (VALUE) == CONST0_RTX (GET_MODE (VALUE)))
2021 /* Letters in the range `Q' through `U' may be defined in a
2022 machine-dependent fashion to stand for arbitrary operand types.
2023 The machine description macro `EXTRA_CONSTRAINT' is passed the
2024 operand as its first argument and the constraint letter as its
2025 second operand.
2027 `Q' is for mips16 GP relative constants
2028 `R' is for memory references which take 1 word for the instruction.
2029 `S' is for references to extern items which are PIC for OSF/rose.
2030 `T' is for memory addresses that can be used to load two words. */
2032 #define EXTRA_CONSTRAINT(OP,CODE) \
2035 && mips16_gp_offset_p (OP)) \
2036 : (GET_CODE (OP) != MEM) ? FALSE \
2039 && HALF_PIC_ADDRESS_P (OP)) \
2040 : FALSE)
2042 /* Given an rtx X being reloaded into a reg required to be
2043 in class CLASS, return the class of reg to actually use.
2044 In general this is just CLASS; but on some machines
2045 in some cases it is preferable to use a more restrictive class. */
2047 #define PREFERRED_RELOAD_CLASS(X,CLASS) \
2048 ((CLASS) != ALL_REGS \
2049 ? (! TARGET_MIPS16 \
2050 ? (CLASS) \
2051 : ((CLASS) != GR_REGS \
2052 ? (CLASS) \
2053 : M16_REGS)) \
2054 : ((GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT \
2055 || GET_MODE_CLASS (GET_MODE (X)) == MODE_COMPLEX_FLOAT) \
2056 ? (TARGET_SOFT_FLOAT \
2057 ? (TARGET_MIPS16 ? M16_REGS : GR_REGS) \
2058 : FP_REGS) \
2059 : ((GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \
2060 || GET_MODE (X) == VOIDmode) \
2061 ? (TARGET_MIPS16 ? M16_REGS : GR_REGS) \
2062 : (CLASS))))
2064 /* Certain machines have the property that some registers cannot be
2065 copied to some other registers without using memory. Define this
2066 macro on those machines to be a C expression that is non-zero if
2067 objects of mode MODE in registers of CLASS1 can only be copied to
2068 registers of class CLASS2 by storing a register of CLASS1 into
2069 memory and loading that memory location into a register of CLASS2.
2071 Do not define this macro if its value would always be zero. */
2073 #define SECONDARY_MEMORY_NEEDED(CLASS1, CLASS2, MODE) \
2074 ((!TARGET_DEBUG_H_MODE \
2075 && GET_MODE_CLASS (MODE) == MODE_INT \
2076 && ((CLASS1 == FP_REGS && GR_REG_CLASS_P (CLASS2)) \
2077 || (GR_REG_CLASS_P (CLASS1) && CLASS2 == FP_REGS))) \
2078 || (TARGET_FLOAT64 && !TARGET_64BIT && (MODE) == DFmode \
2079 && ((GR_REG_CLASS_P (CLASS1) && CLASS2 == FP_REGS) \
2080 || (GR_REG_CLASS_P (CLASS2) && CLASS1 == FP_REGS))))
2082 /* The HI and LO registers can only be reloaded via the general
2083 registers. Condition code registers can only be loaded to the
2084 general registers, and from the floating point registers. */
2086 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
2087 mips_secondary_reload_class (CLASS, MODE, X, 1)
2088 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
2089 mips_secondary_reload_class (CLASS, MODE, X, 0)
2091 /* Return the maximum number of consecutive registers
2092 needed to represent mode MODE in a register of class CLASS. */
2094 #define CLASS_UNITS(mode, size) \
2095 ((GET_MODE_SIZE (mode) + (size) - 1) / (size))
2097 #define CLASS_MAX_NREGS(CLASS, MODE) \
2098 ((CLASS) == FP_REGS \
2099 ? (TARGET_FLOAT64 \
2100 ? CLASS_UNITS (MODE, 8) \
2101 : 2 * CLASS_UNITS (MODE, 8)) \
2102 : CLASS_UNITS (MODE, UNITS_PER_WORD))
2104 /* If defined, gives a class of registers that cannot be used as the
2105 operand of a SUBREG that changes the mode of the object illegally. */
2107 #define CLASS_CANNOT_CHANGE_MODE \
2108 (TARGET_FLOAT64 && ! TARGET_64BIT ? FP_REGS : NO_REGS)
2110 /* Defines illegal mode changes for CLASS_CANNOT_CHANGE_MODE. */
2112 #define CLASS_CANNOT_CHANGE_MODE_P(FROM,TO) \
2113 (GET_MODE_SIZE (FROM) != GET_MODE_SIZE (TO))
2114 \f
2115 /* Stack layout; function entry, exit and calling. */
2117 /* Define this if pushing a word on the stack
2118 makes the stack pointer a smaller address. */
2119 #define STACK_GROWS_DOWNWARD
2121 /* Define this if the nominal address of the stack frame
2122 is at the high-address end of the local variables;
2123 that is, each additional local variable allocated
2124 goes at a more negative offset in the frame. */
2125 /* #define FRAME_GROWS_DOWNWARD */
2127 /* Offset within stack frame to start allocating local variables at.
2128 If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
2129 first local allocated. Otherwise, it is the offset to the BEGINNING
2130 of the first local allocated. */
2131 #define STARTING_FRAME_OFFSET \
2132 (current_function_outgoing_args_size \
2133 + (TARGET_ABICALLS ? MIPS_STACK_ALIGN (UNITS_PER_WORD) : 0))
2135 /* Offset from the stack pointer register to an item dynamically
2136 allocated on the stack, e.g., by `alloca'.
2138 The default value for this macro is `STACK_POINTER_OFFSET' plus the
2139 length of the outgoing arguments. The default is correct for most
2140 machines. See `function.c' for details.
2142 The MIPS ABI states that functions which dynamically allocate the
2143 stack must not have 0 for STACK_DYNAMIC_OFFSET, since it looks like
2144 we are trying to create a second frame pointer to the function, so
2145 allocate some stack space to make it happy.
2147 However, the linker currently complains about linking any code that
2148 dynamically allocates stack space, and there seems to be a bug in
2149 STACK_DYNAMIC_OFFSET, so don't define this right now. */
2151 #if 0
2152 #define STACK_DYNAMIC_OFFSET(FUNDECL) \
2153 ((current_function_outgoing_args_size == 0 && current_function_calls_alloca) \
2154 ? 4*UNITS_PER_WORD \
2155 : current_function_outgoing_args_size)
2156 #endif
2158 /* The return address for the current frame is in r31 is this is a leaf
2159 function. Otherwise, it is on the stack. It is at a variable offset
2160 from sp/fp/ap, so we define a fake hard register rap which is a
2161 poiner to the return address on the stack. This always gets eliminated
2162 during reload to be either the frame pointer or the stack pointer plus
2163 an offset. */
2165 /* ??? This definition fails for leaf functions. There is currently no
2166 general solution for this problem. */
2168 /* ??? There appears to be no way to get the return address of any previous
2169 frame except by disassembling instructions in the prologue/epilogue.
2170 So currently we support only the current frame. */
2172 #define RETURN_ADDR_RTX(count, frame) \
2173 ((count == 0) \
2174 ? gen_rtx_MEM (Pmode, gen_rtx_REG (Pmode, RETURN_ADDRESS_POINTER_REGNUM))\
2175 : (rtx) 0)
2177 /* Structure to be filled in by compute_frame_size with register
2178 save masks, and offsets for the current function. */
2180 struct mips_frame_info
2181 {
2198 };
2202 /* If defined, this macro specifies a table of register pairs used to
2203 eliminate unneeded registers that point into the stack frame. If
2204 it is not defined, the only elimination attempted by the compiler
2205 is to replace references to the frame pointer with references to
2206 the stack pointer.
2208 The definition of this macro is a list of structure
2209 initializations, each of which specifies an original and
2210 replacement register.
2212 On some machines, the position of the argument pointer is not
2213 known until the compilation is completed. In such a case, a
2214 separate hard register must be used for the argument pointer.
2215 This register can be eliminated by replacing it with either the
2216 frame pointer or the argument pointer, depending on whether or not
2217 the frame pointer has been eliminated.
2219 In this case, you might specify:
2220 #define ELIMINABLE_REGS \
2221 {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
2222 {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \
2223 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
2225 Note that the elimination of the argument pointer with the stack
2226 pointer is specified first since that is the preferred elimination.
2228 The eliminations to $17 are only used on the mips16. See the
2229 definition of HARD_FRAME_POINTER_REGNUM. */
2231 #define ELIMINABLE_REGS \
2232 {{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
2233 { ARG_POINTER_REGNUM, GP_REG_FIRST + 30}, \
2234 { ARG_POINTER_REGNUM, GP_REG_FIRST + 17}, \
2235 { RETURN_ADDRESS_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
2236 { RETURN_ADDRESS_POINTER_REGNUM, GP_REG_FIRST + 30}, \
2237 { RETURN_ADDRESS_POINTER_REGNUM, GP_REG_FIRST + 17}, \
2238 { RETURN_ADDRESS_POINTER_REGNUM, GP_REG_FIRST + 31}, \
2239 { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
2240 { FRAME_POINTER_REGNUM, GP_REG_FIRST + 30}, \
2241 { FRAME_POINTER_REGNUM, GP_REG_FIRST + 17}}
2243 /* A C expression that returns non-zero if the compiler is allowed to
2244 try to replace register number FROM-REG with register number
2245 TO-REG. This macro need only be defined if `ELIMINABLE_REGS' is
2246 defined, and will usually be the constant 1, since most of the
2247 cases preventing register elimination are things that the compiler
2248 already knows about.
2250 When not in mips16 and mips64, we can always eliminate to the
2251 frame pointer. We can eliminate to the stack pointer unless
2252 a frame pointer is needed. In mips16 mode, we need a frame
2253 pointer for a large frame; otherwise, reload may be unable
2254 to compute the address of a local variable, since there is
2255 no way to add a large constant to the stack pointer
2256 without using a temporary register.
2258 In mips16, for some instructions (eg lwu), we can't eliminate the
2259 frame pointer for the stack pointer. These instructions are
2260 only generated in TARGET_64BIT mode.
2261 */
2263 #define CAN_ELIMINATE(FROM, TO) \
2264 (((FROM) == RETURN_ADDRESS_POINTER_REGNUM && (! leaf_function_p () \
2265 || (TO == GP_REG_FIRST + 31 && leaf_function_p))) \
2266 || ((FROM) != RETURN_ADDRESS_POINTER_REGNUM \
2267 && ((TO) == HARD_FRAME_POINTER_REGNUM \
2268 || ((TO) == STACK_POINTER_REGNUM && ! frame_pointer_needed \
2269 && ! (TARGET_MIPS16 && TARGET_64BIT) \
2270 && (! TARGET_MIPS16 \
2271 || compute_frame_size (get_frame_size ()) < 32768)))))
2273 /* This macro is similar to `INITIAL_FRAME_POINTER_OFFSET'. It
2274 specifies the initial difference between the specified pair of
2275 registers. This macro must be defined if `ELIMINABLE_REGS' is
2276 defined. */
2278 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
2279 { compute_frame_size (get_frame_size ()); \
2280 if (TARGET_MIPS16 && (FROM) == FRAME_POINTER_REGNUM \
2281 && (TO) == HARD_FRAME_POINTER_REGNUM) \
2282 (OFFSET) = - current_function_outgoing_args_size; \
2283 else if ((FROM) == FRAME_POINTER_REGNUM) \
2284 (OFFSET) = 0; \
2285 else if (TARGET_MIPS16 && (FROM) == ARG_POINTER_REGNUM \
2286 && (TO) == HARD_FRAME_POINTER_REGNUM) \
2287 (OFFSET) = (current_frame_info.total_size \
2288 - current_function_outgoing_args_size \
2289 - ((mips_abi != ABI_32 \
2290 && mips_abi != ABI_O64 \
2291 && mips_abi != ABI_EABI) \
2292 ? current_function_pretend_args_size \
2293 : 0)); \
2294 else if ((FROM) == ARG_POINTER_REGNUM) \
2295 (OFFSET) = (current_frame_info.total_size \
2296 - ((mips_abi != ABI_32 \
2297 && mips_abi != ABI_O64 \
2298 && mips_abi != ABI_EABI) \
2299 ? current_function_pretend_args_size \
2300 : 0)); \
2301 /* Some ABIs store 64 bits to the stack, but Pmode is 32 bits, \
2303 else if ((FROM) == RETURN_ADDRESS_POINTER_REGNUM) \
2304 { \
2305 if (leaf_function_p ()) \
2306 (OFFSET) = 0; \
2307 else (OFFSET) = current_frame_info.gp_sp_offset \
2308 + ((UNITS_PER_WORD - (POINTER_SIZE / BITS_PER_UNIT)) \
2309 * (BYTES_BIG_ENDIAN != 0)); \
2310 } \
2311 else \
2312 abort(); \
2313 }
2315 /* If we generate an insn to push BYTES bytes,
2316 this says how many the stack pointer really advances by.
2317 On the VAX, sp@- in a byte insn really pushes a word. */
2319 /* #define PUSH_ROUNDING(BYTES) 0 */
2321 /* If defined, the maximum amount of space required for outgoing
2322 arguments will be computed and placed into the variable
2323 `current_function_outgoing_args_size'. No space will be pushed
2324 onto the stack for each call; instead, the function prologue
2325 should increase the stack frame size by this amount.
2327 It is not proper to define both `PUSH_ROUNDING' and
2328 `ACCUMULATE_OUTGOING_ARGS'. */
2329 #define ACCUMULATE_OUTGOING_ARGS 1
2331 /* Offset from the argument pointer register to the first argument's
2332 address. On some machines it may depend on the data type of the
2333 function.
2335 If `ARGS_GROW_DOWNWARD', this is the offset to the location above
2336 the first argument's address.
2338 On the MIPS, we must skip the first argument position if we are
2339 returning a structure or a union, to account for its address being
2340 passed in $4. However, at the current time, this produces a compiler
2341 that can't bootstrap, so comment it out for now. */
2343 #if 0
2344 #define FIRST_PARM_OFFSET(FNDECL) \
2345 (FNDECL != 0 \
2346 && TREE_TYPE (FNDECL) != 0 \
2347 && TREE_TYPE (TREE_TYPE (FNDECL)) != 0 \
2348 && (TREE_CODE (TREE_TYPE (TREE_TYPE (FNDECL))) == RECORD_TYPE \
2349 || TREE_CODE (TREE_TYPE (TREE_TYPE (FNDECL))) == UNION_TYPE) \
2350 ? UNITS_PER_WORD \
2351 : 0)
2352 #else
2353 #define FIRST_PARM_OFFSET(FNDECL) 0
2354 #endif
2356 /* When a parameter is passed in a register, stack space is still
2357 allocated for it. For the MIPS, stack space must be allocated, cf
2358 Asm Lang Prog Guide page 7-8.
2360 BEWARE that some space is also allocated for non existing arguments
2361 in register. In case an argument list is of form GF used registers
2362 are a0 (a2,a3), but we should push over a1... */
2364 #define REG_PARM_STACK_SPACE(FNDECL) \
2365 ((MAX_ARGS_IN_REGISTERS*UNITS_PER_WORD) - FIRST_PARM_OFFSET (FNDECL))
2367 /* Define this if it is the responsibility of the caller to
2368 allocate the area reserved for arguments passed in registers.
2369 If `ACCUMULATE_OUTGOING_ARGS' is also defined, the only effect
2370 of this macro is to determine whether the space is included in
2371 `current_function_outgoing_args_size'. */
2372 #define OUTGOING_REG_PARM_STACK_SPACE
2374 /* Align stack frames on 64 bits (Double Word ). */
2375 #ifndef STACK_BOUNDARY
2376 #define STACK_BOUNDARY 64
2377 #endif
2379 /* Make sure 4 words are always allocated on the stack. */
2381 #ifndef STACK_ARGS_ADJUST
2382 #define STACK_ARGS_ADJUST(SIZE) \
2383 { \
2384 if (SIZE.constant < 4 * UNITS_PER_WORD) \
2385 SIZE.constant = 4 * UNITS_PER_WORD; \
2386 }
2387 #endif
2389 \f
2390 /* A C expression that should indicate the number of bytes of its
2391 own arguments that a function pops on returning, or 0
2392 if the function pops no arguments and the caller must therefore
2393 pop them all after the function returns.
2395 FUNDECL is the declaration node of the function (as a tree).
2397 FUNTYPE is a C variable whose value is a tree node that
2398 describes the function in question. Normally it is a node of
2399 type `FUNCTION_TYPE' that describes the data type of the function.
2400 From this it is possible to obtain the data types of the value
2401 and arguments (if known).
2403 When a call to a library function is being considered, FUNTYPE
2404 will contain an identifier node for the library function. Thus,
2405 if you need to distinguish among various library functions, you
2406 can do so by their names. Note that "library function" in this
2407 context means a function used to perform arithmetic, whose name
2408 is known specially in the compiler and was not mentioned in the
2409 C code being compiled.
2411 STACK-SIZE is the number of bytes of arguments passed on the
2412 stack. If a variable number of bytes is passed, it is zero, and
2413 argument popping will always be the responsibility of the
2414 calling function. */
2416 #define RETURN_POPS_ARGS(FUNDECL,FUNTYPE,SIZE) 0
2419 /* Symbolic macros for the registers used to return integer and floating
2420 point values. */
2422 #define GP_RETURN (GP_REG_FIRST + 2)
2423 #define FP_RETURN ((TARGET_SOFT_FLOAT) ? GP_RETURN : (FP_REG_FIRST + 0))
2425 /* Symbolic macros for the first/last argument registers. */
2427 #define GP_ARG_FIRST (GP_REG_FIRST + 4)
2428 #define GP_ARG_LAST (GP_REG_FIRST + 7)
2429 #define FP_ARG_FIRST (FP_REG_FIRST + 12)
2430 #define FP_ARG_LAST (FP_REG_FIRST + 15)
2432 #define MAX_ARGS_IN_REGISTERS 4
2434 /* Define how to find the value returned by a library function
2435 assuming the value has mode MODE. Because we define
2436 PROMOTE_FUNCTION_RETURN, we must promote the mode just as
2437 PROMOTE_MODE does. */
2439 #define LIBCALL_VALUE(MODE) \
2440 gen_rtx (REG, \
2441 ((GET_MODE_CLASS (MODE) != MODE_INT \
2442 || GET_MODE_SIZE (MODE) >= 4) \
2443 ? (MODE) \
2444 : SImode), \
2445 ((GET_MODE_CLASS (MODE) == MODE_FLOAT \
2446 && (! TARGET_SINGLE_FLOAT \
2447 || GET_MODE_SIZE (MODE) <= 4)) \
2448 ? FP_RETURN \
2449 : GP_RETURN))
2451 /* Define how to find the value returned by a function.
2452 VALTYPE is the data type of the value (as a tree).
2453 If the precise function being called is known, FUNC is its FUNCTION_DECL;
2454 otherwise, FUNC is 0. */
2456 #define FUNCTION_VALUE(VALTYPE, FUNC) LIBCALL_VALUE (TYPE_MODE (VALTYPE))
2459 /* 1 if N is a possible register number for a function value.
2460 On the MIPS, R2 R3 and F0 F2 are the only register thus used.
2461 Currently, R2 and F0 are only implemented here (C has no complex type) */
2463 #define FUNCTION_VALUE_REGNO_P(N) ((N) == GP_RETURN || (N) == FP_RETURN)
2465 /* 1 if N is a possible register number for function argument passing.
2466 We have no FP argument registers when soft-float. When FP registers
2467 are 32 bits, we can't directly reference the odd numbered ones. */
2469 #define FUNCTION_ARG_REGNO_P(N) \
2470 (((N) >= GP_ARG_FIRST && (N) <= GP_ARG_LAST) \
2471 || ((! TARGET_SOFT_FLOAT \
2472 && ((N) >= FP_ARG_FIRST && (N) <= FP_ARG_LAST) \
2473 && (TARGET_FLOAT64 || (0 == (N) % 2))) \
2474 && ! fixed_regs[N]))
2476 /* A C expression which can inhibit the returning of certain function
2477 values in registers, based on the type of value. A nonzero value says
2478 to return the function value in memory, just as large structures are
2479 always returned. Here TYPE will be a C expression of type
2480 `tree', representing the data type of the value.
2482 Note that values of mode `BLKmode' must be explicitly
2483 handled by this macro. Also, the option `-fpcc-struct-return'
2484 takes effect regardless of this macro. On most systems, it is
2485 possible to leave the macro undefined; this causes a default
2486 definition to be used, whose value is the constant 1 for BLKmode
2487 values, and 0 otherwise.
2489 GCC normally converts 1 byte structures into chars, 2 byte
2490 structs into shorts, and 4 byte structs into ints, and returns
2491 them this way. Defining the following macro overrides this,
2492 to give us MIPS cc compatibility. */
2494 #define RETURN_IN_MEMORY(TYPE) \
2495 (TYPE_MODE (TYPE) == BLKmode)
2496 \f
2497 /* A code distinguishing the floating point format of the target
2498 machine. There are three defined values: IEEE_FLOAT_FORMAT,
2499 VAX_FLOAT_FORMAT, and UNKNOWN_FLOAT_FORMAT. */
2501 #define TARGET_FLOAT_FORMAT IEEE_FLOAT_FORMAT
2503 \f
2504 /* Define a data type for recording info about an argument list
2505 during the scan of that argument list. This data type should
2506 hold all necessary information about the function itself
2507 and about the args processed so far, enough to enable macros
2508 such as FUNCTION_ARG to determine where the next arg should go.
2510 On the mips16, we need to keep track of which floating point
2511 arguments were passed in general registers, but would have been
2512 passed in the FP regs if this were a 32 bit function, so that we
2513 can move them to the FP regs if we wind up calling a 32 bit
2514 function. We record this information in fp_code, encoded in base
2515 four. A zero digit means no floating point argument, a one digit
2516 means an SFmode argument, and a two digit means a DFmode argument,
2517 and a three digit is not used. The low order digit is the first
2518 argument. Thus 6 == 1 * 4 + 2 means a DFmode argument followed by
2519 an SFmode argument. ??? A more sophisticated approach will be
2520 needed if MIPS_ABI != ABI_32. */
2530 /* Adjustments made to args pass in regs. */
2531 /* ??? The size is doubled to work around a
2532 bug in the code that sets the adjustments
2533 in function_arg. */
2537 /* Initialize a variable CUM of type CUMULATIVE_ARGS
2538 for a call to a function whose data type is FNTYPE.
2539 For a library call, FNTYPE is 0.
2541 */
2543 #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,INDIRECT) \
2544 init_cumulative_args (&CUM, FNTYPE, LIBNAME) \
2546 /* Update the data in CUM to advance over an argument
2547 of mode MODE and data type TYPE.
2548 (TYPE is null for libcalls where that information may not be available.) */
2550 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
2551 function_arg_advance (&CUM, MODE, TYPE, NAMED)
2553 /* Determine where to put an argument to a function.
2554 Value is zero to push the argument on the stack,
2555 or a hard register in which to store the argument.
2557 MODE is the argument's machine mode.
2558 TYPE is the data type of the argument (as a tree).
2559 This is null for libcalls where that information may
2560 not be available.
2561 CUM is a variable of type CUMULATIVE_ARGS which gives info about
2562 the preceding args and about the function being called.
2563 NAMED is nonzero if this argument is a named parameter
2564 (otherwise it is an extra parameter matching an ellipsis). */
2566 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
2567 function_arg( &CUM, MODE, TYPE, NAMED)
2569 /* For an arg passed partly in registers and partly in memory,
2570 this is the number of registers used.
2571 For args passed entirely in registers or entirely in memory, zero. */
2573 #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) \
2574 function_arg_partial_nregs (&CUM, MODE, TYPE, NAMED)
2576 /* If defined, a C expression that gives the alignment boundary, in
2577 bits, of an argument with the specified mode and type. If it is
2578 not defined, `PARM_BOUNDARY' is used for all arguments. */
2580 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) \
2581 (((TYPE) != 0) \
2582 ? ((TYPE_ALIGN(TYPE) <= PARM_BOUNDARY) \
2583 ? PARM_BOUNDARY \
2584 : TYPE_ALIGN(TYPE)) \
2585 : ((GET_MODE_ALIGNMENT(MODE) <= PARM_BOUNDARY) \
2586 ? PARM_BOUNDARY \
2587 : GET_MODE_ALIGNMENT(MODE)))
2589 \f
2590 /* Tell prologue and epilogue if register REGNO should be saved / restored. */
2592 #define MUST_SAVE_REGISTER(regno) \
2593 ((regs_ever_live[regno] && !call_used_regs[regno]) \
2594 || (regno == HARD_FRAME_POINTER_REGNUM && frame_pointer_needed) \
2595 || (regno == (GP_REG_FIRST + 31) && regs_ever_live[GP_REG_FIRST + 31]))
2597 /* ALIGN FRAMES on double word boundaries */
2598 #ifndef MIPS_STACK_ALIGN
2599 #define MIPS_STACK_ALIGN(LOC) (((LOC) + 7) & ~7)
2600 #endif
2602 \f
2603 /* Define the `__builtin_va_list' type for the ABI. */
2604 #define BUILD_VA_LIST_TYPE(VALIST) \
2605 (VALIST) = mips_build_va_list ()
2607 /* Implement `va_start' for varargs and stdarg. */
2608 #define EXPAND_BUILTIN_VA_START(stdarg, valist, nextarg) \
2609 mips_va_start (stdarg, valist, nextarg)
2611 /* Implement `va_arg'. */
2612 #define EXPAND_BUILTIN_VA_ARG(valist, type) \
2613 mips_va_arg (valist, type)
2614 \f
2615 /* Output assembler code to FILE to increment profiler label # LABELNO
2616 for profiling a function entry. */
2618 #define FUNCTION_PROFILER(FILE, LABELNO) \
2619 { \
2620 if (TARGET_MIPS16) \
2625 reg_names[GP_REG_FIRST + 1], reg_names[GP_REG_FIRST + 31]); \
2627 fprintf (FILE, \
2630 reg_names[STACK_POINTER_REGNUM], \
2631 reg_names[STACK_POINTER_REGNUM], \
2632 Pmode == DImode ? 16 : 8); \
2635 }
2637 /* Define this macro if the code for function profiling should come
2638 before the function prologue. Normally, the profiling code comes
2639 after. */
2641 /* #define PROFILE_BEFORE_PROLOGUE */
2643 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
2644 the stack pointer does not matter. The value is tested only in
2645 functions that have frame pointers.
2646 No definition is equivalent to always zero. */
2648 #define EXIT_IGNORE_STACK 1
2650 \f
2651 /* A C statement to output, on the stream FILE, assembler code for a
2652 block of data that contains the constant parts of a trampoline.
2653 This code should not include a label--the label is taken care of
2654 automatically. */
2656 #define TRAMPOLINE_TEMPLATE(STREAM) \
2657 { \
2661 if (Pmode == DImode) \
2662 { \
2665 } \
2666 else \
2667 { \
2670 } \
2674 if (Pmode == DImode) \
2675 { \
2678 } \
2679 else \
2680 { \
2683 } \
2684 }
2686 /* A C expression for the size in bytes of the trampoline, as an
2687 integer. */
2689 #define TRAMPOLINE_SIZE (32 + (Pmode == DImode ? 16 : 8))
2691 /* Alignment required for trampolines, in bits. */
2693 #define TRAMPOLINE_ALIGNMENT (Pmode == DImode ? 64 : 32)
2695 /* INITIALIZE_TRAMPOLINE calls this library function to flush
2696 program and data caches. */
2698 #ifndef CACHE_FLUSH_FUNC
2700 #endif
2702 /* A C statement to initialize the variable parts of a trampoline.
2703 ADDR is an RTX for the address of the trampoline; FNADDR is an
2704 RTX for the address of the nested function; STATIC_CHAIN is an
2705 RTX for the static chain value that should be passed to the
2706 function when it is called. */
2708 #define INITIALIZE_TRAMPOLINE(ADDR, FUNC, CHAIN) \
2709 { \
2710 rtx addr = ADDR; \
2711 if (Pmode == DImode) \
2712 { \
2713 emit_move_insn (gen_rtx_MEM (DImode, plus_constant (addr, 32)), FUNC); \
2714 emit_move_insn (gen_rtx_MEM (DImode, plus_constant (addr, 40)), CHAIN);\
2715 } \
2716 else \
2717 { \
2718 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (addr, 32)), FUNC); \
2719 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (addr, 36)), CHAIN);\
2720 } \
2721 \
2722 /* Flush both caches. We need to flush the data cache in case \
2725 emit_library_call (gen_rtx_SYMBOL_REF (Pmode, CACHE_FLUSH_FUNC), \
2726 0, VOIDmode, 3, addr, Pmode, \
2727 GEN_INT (TRAMPOLINE_SIZE), TYPE_MODE (integer_type_node),\
2728 GEN_INT (3), TYPE_MODE (integer_type_node)); \
2729 }
2730 \f
2731 /* Addressing modes, and classification of registers for them. */
2733 /* #define HAVE_POST_INCREMENT 0 */
2734 /* #define HAVE_POST_DECREMENT 0 */
2736 /* #define HAVE_PRE_DECREMENT 0 */
2737 /* #define HAVE_PRE_INCREMENT 0 */
2739 /* These assume that REGNO is a hard or pseudo reg number.
2740 They give nonzero only if REGNO is a hard reg of the suitable class
2741 or a pseudo reg currently allocated to a suitable hard reg.
2742 These definitions are NOT overridden anywhere. */
2744 #define BASE_REG_P(regno, mode) \
2745 (TARGET_MIPS16 \
2746 ? (M16_REG_P (regno) \
2747 || (regno) == FRAME_POINTER_REGNUM \
2748 || (regno) == ARG_POINTER_REGNUM \
2749 || ((regno) == STACK_POINTER_REGNUM \
2750 && (GET_MODE_SIZE (mode) == 4 \
2751 || GET_MODE_SIZE (mode) == 8))) \
2752 : GP_REG_P (regno))
2754 #define GP_REG_OR_PSEUDO_STRICT_P(regno, mode) \
2755 BASE_REG_P((regno < FIRST_PSEUDO_REGISTER) ? (int) regno : reg_renumber[regno], \
2756 (mode))
2758 #define GP_REG_OR_PSEUDO_NONSTRICT_P(regno, mode) \
2759 (((regno) >= FIRST_PSEUDO_REGISTER) || (BASE_REG_P ((regno), (mode))))
2761 #define REGNO_OK_FOR_INDEX_P(regno) 0
2762 #define REGNO_MODE_OK_FOR_BASE_P(regno, mode) \
2763 GP_REG_OR_PSEUDO_STRICT_P ((regno), (mode))
2765 /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
2766 and check its validity for a certain class.
2767 We have two alternate definitions for each of them.
2768 The usual definition accepts all pseudo regs; the other rejects them all.
2769 The symbol REG_OK_STRICT causes the latter definition to be used.
2771 Most source files want to accept pseudo regs in the hope that
2772 they will get allocated to the class that the insn wants them to be in.
2773 Some source files that are used after register allocation
2774 need to be strict. */
2776 #ifndef REG_OK_STRICT
2777 #define REG_MODE_OK_FOR_BASE_P(X, MODE) \
2778 mips_reg_mode_ok_for_base_p (X, MODE, 0)
2779 #else
2780 #define REG_MODE_OK_FOR_BASE_P(X, MODE) \
2781 mips_reg_mode_ok_for_base_p (X, MODE, 1)
2782 #endif
2784 #define REG_OK_FOR_INDEX_P(X) 0
2786 \f
2787 /* Maximum number of registers that can appear in a valid memory address. */
2789 #define MAX_REGS_PER_ADDRESS 1
2791 /* A C compound statement with a conditional `goto LABEL;' executed
2792 if X (an RTX) is a legitimate memory address on the target
2793 machine for a memory operand of mode MODE.
2795 It usually pays to define several simpler macros to serve as
2796 subroutines for this one. Otherwise it may be too complicated
2797 to understand.
2799 This macro must exist in two variants: a strict variant and a
2800 non-strict one. The strict variant is used in the reload pass.
2801 It must be defined so that any pseudo-register that has not been
2802 allocated a hard register is considered a memory reference. In
2803 contexts where some kind of register is required, a
2804 pseudo-register with no hard register must be rejected.
2806 The non-strict variant is used in other passes. It must be
2807 defined to accept all pseudo-registers in every context where
2808 some kind of register is required.
2810 Compiler source files that want to use the strict variant of
2811 this macro define the macro `REG_OK_STRICT'. You should use an
2812 `#ifdef REG_OK_STRICT' conditional to define the strict variant
2813 in that case and the non-strict variant otherwise.
2815 Typically among the subroutines used to define
2816 `GO_IF_LEGITIMATE_ADDRESS' are subroutines to check for
2817 acceptable registers for various purposes (one for base
2818 registers, one for index registers, and so on). Then only these
2819 subroutine macros need have two variants; the higher levels of
2820 macros may be the same whether strict or not.
2822 Normally, constant addresses which are the sum of a `symbol_ref'
2823 and an integer are stored inside a `const' RTX to mark them as
2824 constant. Therefore, there is no need to recognize such sums
2825 specifically as legitimate addresses. Normally you would simply
2826 recognize any `const' as legitimate.
2828 Usually `PRINT_OPERAND_ADDRESS' is not prepared to handle
2829 constant sums that are not marked with `const'. It assumes
2830 that a naked `plus' indicates indexing. If so, then you *must*
2831 reject such naked constant sums as illegitimate addresses, so
2832 that none of them will be given to `PRINT_OPERAND_ADDRESS'.
2834 On some machines, whether a symbolic address is legitimate
2835 depends on the section that the address refers to. On these
2836 machines, define the macro `ENCODE_SECTION_INFO' to store the
2837 information into the `symbol_ref', and then check for it here.
2838 When you see a `const', you will have to look inside it to find
2839 the `symbol_ref' in order to determine the section. */
2841 #if 1
2842 #define GO_PRINTF(x) fprintf(stderr, (x))
2843 #define GO_PRINTF2(x,y) fprintf(stderr, (x), (y))
2844 #define GO_DEBUG_RTX(x) debug_rtx(x)
2846 #else
2847 #define GO_PRINTF(x)
2848 #define GO_PRINTF2(x,y)
2849 #define GO_DEBUG_RTX(x)
2850 #endif
2852 #ifdef REG_OK_STRICT
2853 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR) \
2854 { \
2855 if (mips_legitimate_address_p (MODE, X, 1)) \
2856 goto ADDR; \
2857 }
2858 #else
2859 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR) \
2860 { \
2861 if (mips_legitimate_address_p (MODE, X, 0)) \
2862 goto ADDR; \
2863 }
2864 #endif
2866 /* A C expression that is 1 if the RTX X is a constant which is a
2867 valid address. This is defined to be the same as `CONSTANT_P (X)',
2868 but rejecting CONST_DOUBLE. */
2869 /* When pic, we must reject addresses of the form symbol+large int.
2870 This is because an instruction `sw $4,s+70000' needs to be converted
2871 by the assembler to `lw $at,s($gp);sw $4,70000($at)'. Normally the
2872 assembler would use $at as a temp to load in the large offset. In this
2873 case $at is already in use. We convert such problem addresses to
2874 `la $5,s;sw $4,70000($5)' via LEGITIMIZE_ADDRESS. */
2875 /* ??? SGI Irix 6 assembler fails for CONST address, so reject them. */
2876 #define CONSTANT_ADDRESS_P(X) \
2877 ((GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
2878 || GET_CODE (X) == CONST_INT || GET_CODE (X) == HIGH \
2879 || (GET_CODE (X) == CONST \
2880 && ! (flag_pic && pic_address_needs_scratch (X)) \
2881 && (mips_abi == ABI_32 \
2882 || mips_abi == ABI_O64 \
2883 || mips_abi == ABI_EABI))) \
2884 && (!HALF_PIC_P () || !HALF_PIC_ADDRESS_P (X)))
2886 /* Define this, so that when PIC, reload won't try to reload invalid
2887 addresses which require two reload registers. */
2889 #define LEGITIMATE_PIC_OPERAND_P(X) (! pic_address_needs_scratch (X))
2891 /* Nonzero if the constant value X is a legitimate general operand.
2892 It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE.
2894 At present, GAS doesn't understand li.[sd], so don't allow it
2895 to be generated at present. Also, the MIPS assembler does not
2896 grok li.d Infinity. */
2898 /* ??? SGI Irix 6 assembler fails for CONST address, so reject them.
2899 Note that the Irix 6 assembler problem may already be fixed.
2900 Note also that the GET_CODE (X) == CONST test catches the mips16
2901 gp pseudo reg (see mips16_gp_pseudo_reg) deciding it is not
2902 a LEGITIMATE_CONSTANT. If we ever want mips16 and ABI_N32 or
2903 ABI_64 to work together, we'll need to fix this. */
2904 #define LEGITIMATE_CONSTANT_P(X) \
2905 ((GET_CODE (X) != CONST_DOUBLE \
2906 || mips_const_double_ok (X, GET_MODE (X))) \
2907 && ! (GET_CODE (X) == CONST \
2908 && ! TARGET_GAS \
2909 && (mips_abi == ABI_N32 \
2910 || mips_abi == ABI_64)) \
2911 && (! TARGET_MIPS16 || mips16_constant (X, GET_MODE (X), 0, 0)))
2913 /* A C compound statement that attempts to replace X with a valid
2914 memory address for an operand of mode MODE. WIN will be a C
2915 statement label elsewhere in the code; the macro definition may
2916 use
2918 GO_IF_LEGITIMATE_ADDRESS (MODE, X, WIN);
2920 to avoid further processing if the address has become legitimate.
2922 X will always be the result of a call to `break_out_memory_refs',
2923 and OLDX will be the operand that was given to that function to
2924 produce X.
2926 The code generated by this macro should not alter the
2927 substructure of X. If it transforms X into a more legitimate
2928 form, it should assign X (which will always be a C variable) a
2929 new value.
2931 It is not necessary for this macro to come up with a legitimate
2932 address. The compiler has standard ways of doing so in all
2933 cases. In fact, it is safe for this macro to do nothing. But
2934 often a machine-dependent strategy can generate better code.
2936 For the MIPS, transform:
2938 memory(X + <large int>)
2940 into:
2942 Y = <large int> & ~0x7fff;
2943 Z = X + Y
2944 memory (Z + (<large int> & 0x7fff));
2946 This is for CSE to find several similar references, and only use one Z.
2948 When PIC, convert addresses of the form memory (symbol+large int) to
2949 memory (reg+large int). */
2952 #define LEGITIMIZE_ADDRESS(X,OLDX,MODE,WIN) \
2953 { \
2954 register rtx xinsn = (X); \
2955 \
2956 if (TARGET_DEBUG_B_MODE) \
2957 { \
2959 GO_DEBUG_RTX (xinsn); \
2960 } \
2961 \
2962 if (mips_split_addresses && mips_check_split (X, MODE)) \
2963 { \
2965 X = gen_rtx_LO_SUM (Pmode, \
2966 copy_to_mode_reg (Pmode, \
2967 gen_rtx (HIGH, Pmode, X)), \
2968 X); \
2969 goto WIN; \
2970 } \
2971 \
2972 if (GET_CODE (xinsn) == CONST \
2973 && ((flag_pic && pic_address_needs_scratch (xinsn)) \
2975 || (mips_abi != ABI_32 \
2976 && mips_abi != ABI_O64 \
2977 && mips_abi != ABI_EABI))) \
2978 { \
2979 rtx ptr_reg = gen_reg_rtx (Pmode); \
2980 rtx constant = XEXP (XEXP (xinsn, 0), 1); \
2981 \
2982 emit_move_insn (ptr_reg, XEXP (XEXP (xinsn, 0), 0)); \
2983 \
2984 X = gen_rtx_PLUS (Pmode, ptr_reg, constant); \
2985 if (SMALL_INT (constant)) \
2986 goto WIN; \
2987 /* Otherwise we fall through so the code below will fix the \
2989 xinsn = X; \
2990 } \
2991 \
2992 if (GET_CODE (xinsn) == PLUS) \
2993 { \
2994 register rtx xplus0 = XEXP (xinsn, 0); \
2995 register rtx xplus1 = XEXP (xinsn, 1); \
2996 register enum rtx_code code0 = GET_CODE (xplus0); \
2997 register enum rtx_code code1 = GET_CODE (xplus1); \
2998 \
2999 if (code0 != REG && code1 == REG) \
3000 { \
3001 xplus0 = XEXP (xinsn, 1); \
3002 xplus1 = XEXP (xinsn, 0); \
3003 code0 = GET_CODE (xplus0); \
3004 code1 = GET_CODE (xplus1); \
3005 } \
3006 \
3007 if (code0 == REG && REG_MODE_OK_FOR_BASE_P (xplus0, MODE) \
3008 && code1 == CONST_INT && !SMALL_INT (xplus1)) \
3009 { \
3010 rtx int_reg = gen_reg_rtx (Pmode); \
3011 rtx ptr_reg = gen_reg_rtx (Pmode); \
3012 \
3013 emit_move_insn (int_reg, \
3014 GEN_INT (INTVAL (xplus1) & ~ 0x7fff)); \
3015 \
3016 emit_insn (gen_rtx_SET (VOIDmode, \
3017 ptr_reg, \
3018 gen_rtx_PLUS (Pmode, xplus0, int_reg))); \
3019 \
3020 X = plus_constant (ptr_reg, INTVAL (xplus1) & 0x7fff); \
3021 goto WIN; \
3022 } \
3023 } \
3024 \
3025 if (TARGET_DEBUG_B_MODE) \
3027 }
3030 /* A C statement or compound statement with a conditional `goto
3031 LABEL;' executed if memory address X (an RTX) can have different
3032 meanings depending on the machine mode of the memory reference it
3033 is used for.
3035 Autoincrement and autodecrement addresses typically have
3036 mode-dependent effects because the amount of the increment or
3037 decrement is the size of the operand being addressed. Some
3038 machines have other mode-dependent addresses. Many RISC machines
3039 have no mode-dependent addresses.
3041 You may assume that ADDR is a valid address for the machine. */
3043 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR,LABEL) {}
3046 /* Define this macro if references to a symbol must be treated
3047 differently depending on something about the variable or
3048 function named by the symbol (such as what section it is in).
3050 The macro definition, if any, is executed immediately after the
3051 rtl for DECL has been created and stored in `DECL_RTL (DECL)'.
3052 The value of the rtl will be a `mem' whose address is a
3053 `symbol_ref'.
3055 The usual thing for this macro to do is to a flag in the
3056 `symbol_ref' (such as `SYMBOL_REF_FLAG') or to store a modified
3057 name string in the `symbol_ref' (if one bit is not enough
3058 information).
3060 The best way to modify the name string is by adding text to the
3061 beginning, with suitable punctuation to prevent any ambiguity.
3062 Allocate the new name in `saveable_obstack'. You will have to
3063 modify `ASM_OUTPUT_LABELREF' to remove and decode the added text
3064 and output the name accordingly.
3066 You can also check the information stored in the `symbol_ref' in
3067 the definition of `GO_IF_LEGITIMATE_ADDRESS' or
3068 `PRINT_OPERAND_ADDRESS'.
3070 When optimizing for the $gp pointer, SYMBOL_REF_FLAG is set for all
3071 small objects.
3073 When generating embedded PIC code, SYMBOL_REF_FLAG is set for
3074 symbols which are not in the .text section.
3076 When generating mips16 code, SYMBOL_REF_FLAG is set for string
3077 constants which are put in the .text section. We also record the
3078 total length of all such strings; this total is used to decide
3079 whether we need to split the constant table, and need not be
3080 precisely correct.
3082 When not mips16 code nor embedded PIC, if a symbol is in a
3083 gp addresable section, SYMBOL_REF_FLAG is set prevent gcc from
3084 splitting the reference so that gas can generate a gp relative
3085 reference.
3087 When TARGET_EMBEDDED_DATA is set, we assume that all const
3088 variables will be stored in ROM, which is too far from %gp to use
3089 %gprel addressing. Note that (1) we include "extern const"
3090 variables in this, which mips_select_section doesn't, and (2) we
3091 can't always tell if they're really const (they might be const C++
3092 objects with non-const constructors), so we err on the side of
3093 caution and won't use %gprel anyway (otherwise we'd have to defer
3094 this decision to the linker/loader). The handling of extern consts
3095 is why the DECL_INITIAL macros differ from mips_select_section.
3097 If you are changing this macro, you should look at
3098 mips_select_section and see if it needs a similar change. */
3100 #define ENCODE_SECTION_INFO(DECL) \
3101 do \
3102 { \
3103 if (TARGET_MIPS16) \
3104 { \
3105 if (TREE_CODE (DECL) == STRING_CST \
3106 && ! flag_writable_strings \
3107 /* If this string is from a function, and the function will \
3108 go in a gnu linkonce section, then we can't directly \
3109 access the string. This gets an assembler error \
3110 "unsupported PC relative reference to different section".\
3111 If we modify SELECT_SECTION to put it in function_section\
3112 instead of text_section, it still fails because \
3113 DECL_SECTION_NAME isn't set until assemble_start_function.\
3114 If we fix that, it still fails because strings are shared\
3115 among multiple functions, and we have cross section \
3116 references again. We force it to work by putting string \
3118 && (! current_function_decl \
3119 || ! DECL_ONE_ONLY (current_function_decl))) \
3120 { \
3121 SYMBOL_REF_FLAG (XEXP (TREE_CST_RTL (DECL), 0)) = 1; \
3122 mips_string_length += TREE_STRING_LENGTH (DECL); \
3123 } \
3124 } \
3125 \
3126 if (TARGET_EMBEDDED_DATA \
3127 && (TREE_CODE (DECL) == VAR_DECL \
3128 && TREE_READONLY (DECL) && !TREE_SIDE_EFFECTS (DECL)) \
3129 && (!DECL_INITIAL (DECL) \
3130 || TREE_CONSTANT (DECL_INITIAL (DECL)))) \
3131 { \
3132 SYMBOL_REF_FLAG (XEXP (DECL_RTL (DECL), 0)) = 0; \
3133 } \
3134 \
3135 else if (TARGET_EMBEDDED_PIC) \
3136 { \
3137 if (TREE_CODE (DECL) == VAR_DECL) \
3138 SYMBOL_REF_FLAG (XEXP (DECL_RTL (DECL), 0)) = 1; \
3139 else if (TREE_CODE (DECL) == FUNCTION_DECL) \
3140 SYMBOL_REF_FLAG (XEXP (DECL_RTL (DECL), 0)) = 0; \
3141 else if (TREE_CODE (DECL) == STRING_CST \
3142 && ! flag_writable_strings) \
3143 SYMBOL_REF_FLAG (XEXP (TREE_CST_RTL (DECL), 0)) = 0; \
3144 else \
3145 SYMBOL_REF_FLAG (XEXP (TREE_CST_RTL (DECL), 0)) = 1; \
3146 } \
3147 \
3148 else if (TREE_CODE (DECL) == VAR_DECL \
3149 && DECL_SECTION_NAME (DECL) != NULL_TREE \
3150 && (0 == strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (DECL)), \
3152 || 0 == strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (DECL)),\
3154 { \
3155 SYMBOL_REF_FLAG (XEXP (DECL_RTL (DECL), 0)) = 1; \
3156 } \
3157 \
3158 /* We can not perform GP optimizations on variables which are in \
3159 specific sections, except for .sdata and .sbss which are \
3161 else if (TARGET_GP_OPT && TREE_CODE (DECL) == VAR_DECL \
3162 && DECL_SECTION_NAME (DECL) == NULL_TREE) \
3163 { \
3164 int size = int_size_in_bytes (TREE_TYPE (DECL)); \
3165 \
3166 if (size > 0 && size <= mips_section_threshold) \
3167 SYMBOL_REF_FLAG (XEXP (DECL_RTL (DECL), 0)) = 1; \
3168 } \
3169 \
3170 else if (HALF_PIC_P ()) \
3171 { \
3172 HALF_PIC_ENCODE (DECL); \
3173 } \
3174 } \
3175 while (0)
3177 /* This handles the magic '..CURRENT_FUNCTION' symbol, which means
3178 'the start of the function that this code is output in'. */
3180 #define ASM_OUTPUT_LABELREF(FILE,NAME) \
3183 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \
3184 else \
3187 /* The mips16 wants the constant pool to be after the function,
3188 because the PC relative load instructions use unsigned offsets. */
3190 #define CONSTANT_POOL_BEFORE_FUNCTION (! TARGET_MIPS16)
3192 #define ASM_OUTPUT_POOL_EPILOGUE(FILE, FNNAME, FNDECL, SIZE) \
3193 mips_string_length = 0;
3195 #if 0
3196 /* In mips16 mode, put most string constants after the function. */
3197 #define CONSTANT_AFTER_FUNCTION_P(tree) \
3198 (TARGET_MIPS16 && mips16_constant_after_function_p (tree))
3199 #endif
3200 \f
3201 /* Specify the machine mode that this machine uses
3202 for the index in the tablejump instruction.
3203 ??? Using HImode in mips16 mode can cause overflow. However, the
3204 overflow is no more likely than the overflow in a branch
3205 instruction. Large functions can currently break in both ways. */
3206 #define CASE_VECTOR_MODE \
3207 (TARGET_MIPS16 ? HImode : Pmode == DImode ? DImode : SImode)
3209 /* Define as C expression which evaluates to nonzero if the tablejump
3210 instruction expects the table to contain offsets from the address of the
3211 table.
3212 Do not define this if the table should contain absolute addresses. */
3213 #define CASE_VECTOR_PC_RELATIVE (TARGET_MIPS16)
3215 /* Specify the tree operation to be used to convert reals to integers. */
3216 #define IMPLICIT_FIX_EXPR FIX_ROUND_EXPR
3218 /* This is the kind of divide that is easiest to do in the general case. */
3219 #define EASY_DIV_EXPR TRUNC_DIV_EXPR
3221 /* Define this as 1 if `char' should by default be signed; else as 0. */
3222 #ifndef DEFAULT_SIGNED_CHAR
3223 #define DEFAULT_SIGNED_CHAR 1
3224 #endif
3226 /* Max number of bytes we can move from memory to memory
3227 in one reasonably fast instruction. */
3228 #define MOVE_MAX (TARGET_64BIT ? 8 : 4)
3229 #define MAX_MOVE_MAX 8
3231 /* Define this macro as a C expression which is nonzero if
3232 accessing less than a word of memory (i.e. a `char' or a
3233 `short') is no faster than accessing a word of memory, i.e., if
3234 such access require more than one instruction or if there is no
3235 difference in cost between byte and (aligned) word loads.
3237 On RISC machines, it tends to generate better code to define
3238 this as 1, since it avoids making a QI or HI mode register. */
3239 #define SLOW_BYTE_ACCESS 1
3241 /* We assume that the store-condition-codes instructions store 0 for false
3242 and some other value for true. This is the value stored for true. */
3244 #define STORE_FLAG_VALUE 1
3246 /* Define this if zero-extension is slow (more than one real instruction). */
3247 #define SLOW_ZERO_EXTEND
3249 /* Define this to be nonzero if shift instructions ignore all but the low-order
3250 few bits. */
3251 #define SHIFT_COUNT_TRUNCATED 1
3253 /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
3254 is done just by pretending it is already truncated. */
3255 /* In 64 bit mode, 32 bit instructions require that register values be properly
3256 sign-extended to 64 bits. As a result, a truncate is not a no-op if it
3257 converts a value >32 bits to a value <32 bits. */
3258 /* ??? This results in inefficient code for 64 bit to 32 conversions.
3259 Something needs to be done about this. Perhaps not use any 32 bit
3260 instructions? Perhaps use PROMOTE_MODE? */
3261 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) \
3262 (TARGET_64BIT ? ((INPREC) <= 32 || (OUTPREC) > 32) : 1)
3264 /* Specify the machine mode that pointers have.
3265 After generation of rtl, the compiler makes no further distinction
3266 between pointers and any other objects of this machine mode.
3268 For MIPS we make pointers are the smaller of longs and gp-registers. */
3270 #ifndef Pmode
3271 #define Pmode ((TARGET_LONG64 && TARGET_64BIT) ? DImode : SImode)
3272 #endif
3274 /* A function address in a call instruction
3275 is a word address (for indexing purposes)
3276 so give the MEM rtx a words's mode. */
3278 #define FUNCTION_MODE (Pmode == DImode ? DImode : SImode)
3280 /* Define TARGET_MEM_FUNCTIONS if we want to use calls to memcpy and
3281 memset, instead of the BSD functions bcopy and bzero. */
3283 #if defined(MIPS_SYSV) || defined(OSF_OS)
3284 #define TARGET_MEM_FUNCTIONS
3285 #endif
3287 \f
3288 /* A part of a C `switch' statement that describes the relative
3289 costs of constant RTL expressions. It must contain `case'
3290 labels for expression codes `const_int', `const', `symbol_ref',
3291 `label_ref' and `const_double'. Each case must ultimately reach
3292 a `return' statement to return the relative cost of the use of
3293 that kind of constant value in an expression. The cost may
3294 depend on the precise value of the constant, which is available
3295 for examination in X.
3297 CODE is the expression code--redundant, since it can be obtained
3298 with `GET_CODE (X)'. */
3300 #define CONST_COSTS(X,CODE,OUTER_CODE) \
3301 case CONST_INT: \
3302 if (! TARGET_MIPS16) \
3303 { \
3304 /* Always return 0, since we don't have different sized \
3305 instructions, hence different costs according to Richard \
3307 return 0; \
3308 } \
3309 if ((OUTER_CODE) == SET) \
3310 { \
3311 if (INTVAL (X) >= 0 && INTVAL (X) < 0x100) \
3312 return 0; \
3313 else if ((INTVAL (X) >= 0 && INTVAL (X) < 0x10000) \
3314 || (INTVAL (X) < 0 && INTVAL (X) > -0x100)) \
3315 return COSTS_N_INSNS (1); \
3316 else \
3317 return COSTS_N_INSNS (2); \
3318 } \
3319 /* A PLUS could be an address. We don't want to force an address \
3320 to use a register, so accept any signed 16 bit value without \
3322 if ((OUTER_CODE) == PLUS \
3323 && INTVAL (X) >= -0x8000 && INTVAL (X) < 0x8000) \
3324 return 0; \
3325 /* A number between 1 and 8 inclusive is efficient for a shift. \
3327 if ((OUTER_CODE) == ASHIFT || (OUTER_CODE) == ASHIFTRT \
3328 || (OUTER_CODE) == LSHIFTRT) \
3329 { \
3330 if (INTVAL (X) >= 1 && INTVAL (X) <= 8) \
3331 return 0; \
3332 return COSTS_N_INSNS (1); \
3333 } \
3335 if ((OUTER_CODE) == XOR \
3336 && INTVAL (X) >= 0 && INTVAL (X) < 0x10000) \
3337 return 0; \
3338 /* We may be able to use slt or sltu for a comparison with a \
3339 signed 16 bit value. (The boundary conditions aren't quite \
3341 if (((OUTER_CODE) == LT || (OUTER_CODE) == LE \
3342 || (OUTER_CODE) == GE || (OUTER_CODE) == GT \
3343 || (OUTER_CODE) == LTU || (OUTER_CODE) == LEU \
3344 || (OUTER_CODE) == GEU || (OUTER_CODE) == GTU) \
3345 && INTVAL (X) >= -0x8000 && INTVAL (X) < 0x8000) \
3346 return 0; \
3348 if (((OUTER_CODE) == EQ || (OUTER_CODE) == NE) \
3349 && INTVAL (X) == 0) \
3350 return 0; \
3351 \
3352 /* Otherwise, work out the cost to load the value into a \
3354 if (INTVAL (X) >= 0 && INTVAL (X) < 0x100) \
3355 return COSTS_N_INSNS (1); \
3356 else if ((INTVAL (X) >= 0 && INTVAL (X) < 0x10000) \
3357 || (INTVAL (X) < 0 && INTVAL (X) > -0x100)) \
3358 return COSTS_N_INSNS (2); \
3359 else \
3360 return COSTS_N_INSNS (3); \
3361 \
3362 case LABEL_REF: \
3363 return COSTS_N_INSNS (2); \
3364 \
3365 case CONST: \
3366 { \
3367 rtx offset = const0_rtx; \
3368 rtx symref = eliminate_constant_term (XEXP (X, 0), &offset); \
3369 \
3370 if (TARGET_MIPS16 && mips16_gp_offset_p (X)) \
3371 { \
3373 if ((OUTER_CODE) == PLUS) \
3374 return 0; \
3375 else if ((OUTER_CODE) == SET) \
3376 return COSTS_N_INSNS (1); \
3377 else \
3378 return COSTS_N_INSNS (2); \
3379 } \
3380 \
3381 if (GET_CODE (symref) == LABEL_REF) \
3382 return COSTS_N_INSNS (2); \
3383 \
3384 if (GET_CODE (symref) != SYMBOL_REF) \
3385 return COSTS_N_INSNS (4); \
3386 \
3388 if (INTVAL (offset) < -32768 || INTVAL (offset) > 32767) \
3389 return COSTS_N_INSNS (2); \
3390 \
3391 return COSTS_N_INSNS (SYMBOL_REF_FLAG (symref) ? 1 : 2); \
3392 } \
3393 \
3394 case SYMBOL_REF: \
3395 return COSTS_N_INSNS (SYMBOL_REF_FLAG (X) ? 1 : 2); \
3396 \
3397 case CONST_DOUBLE: \
3398 { \
3399 rtx high, low; \
3400 if (TARGET_MIPS16) \
3401 return COSTS_N_INSNS (4); \
3402 split_double (X, &high, &low); \
3403 return COSTS_N_INSNS ((high == CONST0_RTX (GET_MODE (high)) \
3404 || low == CONST0_RTX (GET_MODE (low))) \
3405 ? 2 : 4); \
3406 }
3408 /* Like `CONST_COSTS' but applies to nonconstant RTL expressions.
3409 This can be used, for example, to indicate how costly a multiply
3410 instruction is. In writing this macro, you can use the construct
3411 `COSTS_N_INSNS (N)' to specify a cost equal to N fast instructions.
3413 This macro is optional; do not define it if the default cost
3414 assumptions are adequate for the target machine.
3416 If -mdebugd is used, change the multiply cost to 2, so multiply by
3417 a constant isn't converted to a series of shifts. This helps
3418 strength reduction, and also makes it easier to identify what the
3419 compiler is doing. */
3421 /* ??? Fix this to be right for the R8000. */
3422 #define RTX_COSTS(X,CODE,OUTER_CODE) \
3423 case MEM: \
3424 { \
3425 int num_words = (GET_MODE_SIZE (GET_MODE (X)) > UNITS_PER_WORD) ? 2 : 1; \
3426 if (simple_memory_operand (X, GET_MODE (X))) \
3427 return COSTS_N_INSNS (num_words); \
3428 \
3429 return COSTS_N_INSNS (2*num_words); \
3430 } \
3431 \
3432 case FFS: \
3433 return COSTS_N_INSNS (6); \
3434 \
3435 case NOT: \
3436 return COSTS_N_INSNS ((GET_MODE (X) == DImode && !TARGET_64BIT) ? 2 : 1); \
3437 \
3438 case AND: \
3439 case IOR: \
3440 case XOR: \
3441 if (GET_MODE (X) == DImode && !TARGET_64BIT) \
3442 return COSTS_N_INSNS (2); \
3443 \
3444 break; \
3445 \
3446 case ASHIFT: \
3447 case ASHIFTRT: \
3448 case LSHIFTRT: \
3449 if (GET_MODE (X) == DImode && !TARGET_64BIT) \
3450 return COSTS_N_INSNS ((GET_CODE (XEXP (X, 1)) == CONST_INT) ? 4 : 12); \
3451 \
3452 break; \
3453 \
3454 case ABS: \
3455 { \
3456 enum machine_mode xmode = GET_MODE (X); \
3457 if (xmode == SFmode || xmode == DFmode) \
3458 return COSTS_N_INSNS (1); \
3459 \
3460 return COSTS_N_INSNS (4); \
3461 } \
3462 \
3463 case PLUS: \
3464 case MINUS: \
3465 { \
3466 enum machine_mode xmode = GET_MODE (X); \
3467 if (xmode == SFmode || xmode == DFmode) \
3468 { \
3469 if (TUNE_MIPS3000 \
3470 || TUNE_MIPS3900) \
3471 return COSTS_N_INSNS (2); \
3472 else if (TUNE_MIPS6000) \
3473 return COSTS_N_INSNS (3); \
3474 else \
3475 return COSTS_N_INSNS (6); \
3476 } \
3477 \
3478 if (xmode == DImode && !TARGET_64BIT) \
3479 return COSTS_N_INSNS (4); \
3480 \
3481 break; \
3482 } \
3483 \
3484 case NEG: \
3485 if (GET_MODE (X) == DImode && !TARGET_64BIT) \
3486 return 4; \
3487 \
3488 break; \
3489 \
3490 case MULT: \
3491 { \
3492 enum machine_mode xmode = GET_MODE (X); \
3493 if (xmode == SFmode) \
3494 { \
3495 if (TUNE_MIPS3000 \
3496 || TUNE_MIPS3900 \
3497 || TUNE_MIPS5000) \
3498 return COSTS_N_INSNS (4); \
3499 else if (TUNE_MIPS6000) \
3500 return COSTS_N_INSNS (5); \
3501 else \
3502 return COSTS_N_INSNS (7); \
3503 } \
3504 \
3505 if (xmode == DFmode) \
3506 { \
3507 if (TUNE_MIPS3000 \
3508 || TUNE_MIPS3900 \
3509 || TUNE_MIPS5000) \
3510 return COSTS_N_INSNS (5); \
3511 else if (TUNE_MIPS6000) \
3512 return COSTS_N_INSNS (6); \
3513 else \
3514 return COSTS_N_INSNS (8); \
3515 } \
3516 \
3517 if (TUNE_MIPS3000) \
3518 return COSTS_N_INSNS (12); \
3519 else if (TUNE_MIPS3900) \
3520 return COSTS_N_INSNS (2); \
3521 else if (TUNE_MIPS6000) \
3522 return COSTS_N_INSNS (17); \
3523 else if (TUNE_MIPS5000) \
3524 return COSTS_N_INSNS (5); \
3525 else \
3526 return COSTS_N_INSNS (10); \
3527 } \
3528 \
3529 case DIV: \
3530 case MOD: \
3531 { \
3532 enum machine_mode xmode = GET_MODE (X); \
3533 if (xmode == SFmode) \
3534 { \
3535 if (TUNE_MIPS3000 \
3536 || TUNE_MIPS3900) \
3537 return COSTS_N_INSNS (12); \
3538 else if (TUNE_MIPS6000) \
3539 return COSTS_N_INSNS (15); \
3540 else \
3541 return COSTS_N_INSNS (23); \
3542 } \
3543 \
3544 if (xmode == DFmode) \
3545 { \
3546 if (TUNE_MIPS3000 \
3547 || TUNE_MIPS3900) \
3548 return COSTS_N_INSNS (19); \
3549 else if (TUNE_MIPS6000) \
3550 return COSTS_N_INSNS (16); \
3551 else \
3552 return COSTS_N_INSNS (36); \
3553 } \
3554 } \
3556 \
3557 case UDIV: \
3558 case UMOD: \
3559 if (TUNE_MIPS3000 \
3560 || TUNE_MIPS3900) \
3561 return COSTS_N_INSNS (35); \
3562 else if (TUNE_MIPS6000) \
3563 return COSTS_N_INSNS (38); \
3564 else if (TUNE_MIPS5000) \
3565 return COSTS_N_INSNS (36); \
3566 else \
3567 return COSTS_N_INSNS (69); \
3568 \
3569 case SIGN_EXTEND: \
3570 /* A sign extend from SImode to DImode in 64 bit mode is often \
3571 zero instructions, because the result can often be used \
3573 if (TARGET_64BIT && GET_MODE (X) == DImode \
3574 && GET_MODE (XEXP (X, 0)) == SImode) \
3575 return COSTS_N_INSNS (1); \
3576 else \
3577 return COSTS_N_INSNS (2); \
3578 \
3579 case ZERO_EXTEND: \
3580 if (TARGET_64BIT && GET_MODE (X) == DImode \
3581 && GET_MODE (XEXP (X, 0)) == SImode) \
3582 return COSTS_N_INSNS (2); \
3583 else \
3584 return COSTS_N_INSNS (1);
3586 /* An expression giving the cost of an addressing mode that
3587 contains ADDRESS. If not defined, the cost is computed from the
3588 form of the ADDRESS expression and the `CONST_COSTS' values.
3590 For most CISC machines, the default cost is a good approximation
3591 of the true cost of the addressing mode. However, on RISC
3592 machines, all instructions normally have the same length and
3593 execution time. Hence all addresses will have equal costs.
3595 In cases where more than one form of an address is known, the
3596 form with the lowest cost will be used. If multiple forms have
3597 the same, lowest, cost, the one that is the most complex will be
3598 used.
3600 For example, suppose an address that is equal to the sum of a
3601 register and a constant is used twice in the same basic block.
3602 When this macro is not defined, the address will be computed in
3603 a register and memory references will be indirect through that
3604 register. On machines where the cost of the addressing mode
3605 containing the sum is no higher than that of a simple indirect
3606 reference, this will produce an additional instruction and
3607 possibly require an additional register. Proper specification
3608 of this macro eliminates this overhead for such machines.
3610 Similar use of this macro is made in strength reduction of loops.
3612 ADDRESS need not be valid as an address. In such a case, the
3613 cost is not relevant and can be any value; invalid addresses
3614 need not be assigned a different cost.
3616 On machines where an address involving more than one register is
3617 as cheap as an address computation involving only one register,
3618 defining `ADDRESS_COST' to reflect this can cause two registers
3619 to be live over a region of code where only one would have been
3620 if `ADDRESS_COST' were not defined in that manner. This effect
3621 should be considered in the definition of this macro.
3622 Equivalent costs should probably only be given to addresses with
3623 different numbers of registers on machines with lots of registers.
3625 This macro will normally either not be defined or be defined as
3626 a constant. */
3628 #define ADDRESS_COST(ADDR) (REG_P (ADDR) ? 1 : mips_address_cost (ADDR))
3630 /* A C expression for the cost of moving data from a register in
3631 class FROM to one in class TO. The classes are expressed using
3632 the enumeration values such as `GENERAL_REGS'. A value of 2 is
3633 the default; other values are interpreted relative to that.
3635 It is not required that the cost always equal 2 when FROM is the
3636 same as TO; on some machines it is expensive to move between
3637 registers if they are not general registers.
3639 If reload sees an insn consisting of a single `set' between two
3640 hard registers, and if `REGISTER_MOVE_COST' applied to their
3641 classes returns a value of 2, reload does not check to ensure
3642 that the constraints of the insn are met. Setting a cost of
3643 other than 2 will allow reload to verify that the constraints are
3644 met. You should do this if the `movM' pattern's constraints do
3645 not allow such copying.
3647 ??? We make make the cost of moving from HI/LO/HILO/MD into general
3648 registers the same as for one of moving general registers to
3649 HI/LO/HILO/MD for TARGET_MIPS16 in order to prevent allocating a
3650 pseudo to HI/LO/HILO/MD. This might hurt optimizations though, it
3651 isn't clear if it is wise. And it might not work in all cases. We
3652 could solve the DImode LO reg problem by using a multiply, just like
3653 reload_{in,out}si. We could solve the SImode/HImode HI reg problem
3654 by using divide instructions. divu puts the remainder in the HI
3655 reg, so doing a divide by -1 will move the value in the HI reg for
3656 all values except -1. We could handle that case by using a signed
3657 divide, e.g. -1 / 2 (or maybe 1 / -2?). We'd have to emit a
3658 compare/branch to test the input value to see which instruction we
3659 need to use. This gets pretty messy, but it is feasible. */
3661 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
3662 ((FROM) == M16_REGS && GR_REG_CLASS_P (TO) ? 2 \
3663 : (FROM) == M16_NA_REGS && GR_REG_CLASS_P (TO) ? 2 \
3664 : GR_REG_CLASS_P (FROM) && (TO) == M16_REGS ? 2 \
3665 : GR_REG_CLASS_P (FROM) && (TO) == M16_NA_REGS ? 2 \
3666 : GR_REG_CLASS_P (FROM) && GR_REG_CLASS_P (TO) ? (TARGET_MIPS16 ? 4 : 2) \
3667 : (FROM) == FP_REGS && (TO) == FP_REGS ? 2 \
3668 : GR_REG_CLASS_P (FROM) && (TO) == FP_REGS ? 4 \
3669 : (FROM) == FP_REGS && GR_REG_CLASS_P (TO) ? 4 \
3670 : (((FROM) == HI_REG || (FROM) == LO_REG \
3671 || (FROM) == MD_REGS || (FROM) == HILO_REG) \
3672 && GR_REG_CLASS_P (TO)) ? (TARGET_MIPS16 ? 12 : 6) \
3673 : (((TO) == HI_REG || (TO) == LO_REG \
3674 || (TO) == MD_REGS || (TO) == HILO_REG) \
3675 && GR_REG_CLASS_P (FROM)) ? (TARGET_MIPS16 ? 12 : 6) \
3676 : (FROM) == ST_REGS && GR_REG_CLASS_P (TO) ? 4 \
3677 : (FROM) == FP_REGS && (TO) == ST_REGS ? 8 \
3678 : 12)
3680 /* ??? Fix this to be right for the R8000. */
3681 #define MEMORY_MOVE_COST(MODE,CLASS,TO_P) \
3682 (((TUNE_MIPS4000 || TUNE_MIPS6000) ? 6 : 4) \
3683 + memory_move_secondary_cost ((MODE), (CLASS), (TO_P)))
3685 /* Define if copies to/from condition code registers should be avoided.
3687 This is needed for the MIPS because reload_outcc is not complete;
3688 it needs to handle cases where the source is a general or another
3689 condition code register. */
3690 #define AVOID_CCMODE_COPIES
3692 /* A C expression for the cost of a branch instruction. A value of
3693 1 is the default; other values are interpreted relative to that. */
3695 /* ??? Fix this to be right for the R8000. */
3696 #define BRANCH_COST \
3697 ((! TARGET_MIPS16 \
3698 && (TUNE_MIPS4000 || TUNE_MIPS6000)) \
3699 ? 2 : 1)
3701 /* If defined, modifies the length assigned to instruction INSN as a
3702 function of the context in which it is used. LENGTH is an lvalue
3703 that contains the initially computed length of the insn and should
3704 be updated with the correct length of the insn. */
3705 #define ADJUST_INSN_LENGTH(INSN, LENGTH) \
3706 ((LENGTH) = mips_adjust_insn_length ((INSN), (LENGTH)))
3708 \f
3709 /* Optionally define this if you have added predicates to
3710 `MACHINE.c'. This macro is called within an initializer of an
3711 array of structures. The first field in the structure is the
3712 name of a predicate and the second field is an array of rtl
3713 codes. For each predicate, list all rtl codes that can be in
3714 expressions matched by the predicate. The list should have a
3715 trailing comma. Here is an example of two entries in the list
3716 for a typical RISC machine:
3718 #define PREDICATE_CODES \
3719 {"gen_reg_rtx_operand", {SUBREG, REG}}, \
3720 {"reg_or_short_cint_operand", {SUBREG, REG, CONST_INT}},
3722 Defining this macro does not affect the generated code (however,
3723 incorrect definitions that omit an rtl code that may be matched
3724 by the predicate can cause the compiler to malfunction).
3725 Instead, it allows the table built by `genrecog' to be more
3726 compact and efficient, thus speeding up the compiler. The most
3727 important predicates to include in the list specified by this
3728 macro are thoses used in the most insn patterns. */
3730 #define PREDICATE_CODES \
3743 LTU, LEU }}, \
3748 SYMBOL_REF, LABEL_REF, SUBREG, \
3749 REG, MEM}}, \
3751 SYMBOL_REF, LABEL_REF, SUBREG, REG, \
3752 MEM, SIGN_EXTEND }}, \
3755 SIGN_EXTEND }}, \
3757 SIGN_EXTEND }}, \
3759 SIGN_EXTEND }}, \
3761 SYMBOL_REF, LABEL_REF, SUBREG, \
3762 REG, SIGN_EXTEND }}, \
3765 CONST_DOUBLE, CONST }}, \
3769 /* A list of predicates that do special things with modes, and so
3770 should not elicit warnings for VOIDmode match_operand. */
3772 #define SPECIAL_MODE_PREDICATES \
3775 \f
3776 /* If defined, a C statement to be executed just prior to the
3777 output of assembler code for INSN, to modify the extracted
3778 operands so they will be output differently.
3780 Here the argument OPVEC is the vector containing the operands
3781 extracted from INSN, and NOPERANDS is the number of elements of
3782 the vector which contain meaningful data for this insn. The
3783 contents of this vector are what will be used to convert the
3784 insn template into assembler code, so you can change the
3785 assembler output by changing the contents of the vector.
3787 We use it to check if the current insn needs a nop in front of it
3788 because of load delays, and also to update the delay slot
3789 statistics. */
3791 #define FINAL_PRESCAN_INSN(INSN, OPVEC, NOPERANDS) \
3792 final_prescan_insn (INSN, OPVEC, NOPERANDS)
3794 \f
3795 /* Control the assembler format that we output. */
3797 /* Output at beginning of assembler file.
3798 If we are optimizing to use the global pointer, create a temporary
3799 file to hold all of the text stuff, and write it out to the end.
3800 This is needed because the MIPS assembler is evidently one pass,
3801 and if it hasn't seen the relevant .comm/.lcomm/.extern/.sdata
3802 declaration when the code is processed, it generates a two
3803 instruction sequence. */
3805 #undef ASM_FILE_START
3806 #define ASM_FILE_START(STREAM) mips_asm_file_start (STREAM)
3808 /* Output to assembler file text saying following lines
3809 may contain character constants, extra white space, comments, etc. */
3811 #ifndef ASM_APP_ON
3813 #endif
3815 /* Output to assembler file text saying following lines
3816 no longer contain unusual constructs. */
3818 #ifndef ASM_APP_OFF
3820 #endif
3822 /* How to refer to registers in assembler output.
3823 This sequence is indexed by compiler's hard-register-number (see above).
3825 In order to support the two different conventions for register names,
3826 we use the name of a table set up in mips.c, which is overwritten
3827 if -mrnames is used. */
3829 #define REGISTER_NAMES \
3830 { \
3831 &mips_reg_names[ 0][0], \
3832 &mips_reg_names[ 1][0], \
3833 &mips_reg_names[ 2][0], \
3834 &mips_reg_names[ 3][0], \
3835 &mips_reg_names[ 4][0], \
3836 &mips_reg_names[ 5][0], \
3837 &mips_reg_names[ 6][0], \
3838 &mips_reg_names[ 7][0], \
3839 &mips_reg_names[ 8][0], \
3840 &mips_reg_names[ 9][0], \
3841 &mips_reg_names[10][0], \
3842 &mips_reg_names[11][0], \
3843 &mips_reg_names[12][0], \
3844 &mips_reg_names[13][0], \
3845 &mips_reg_names[14][0], \
3846 &mips_reg_names[15][0], \
3847 &mips_reg_names[16][0], \
3848 &mips_reg_names[17][0], \
3849 &mips_reg_names[18][0], \
3850 &mips_reg_names[19][0], \
3851 &mips_reg_names[20][0], \
3852 &mips_reg_names[21][0], \
3853 &mips_reg_names[22][0], \
3854 &mips_reg_names[23][0], \
3855 &mips_reg_names[24][0], \
3856 &mips_reg_names[25][0], \
3857 &mips_reg_names[26][0], \
3858 &mips_reg_names[27][0], \
3859 &mips_reg_names[28][0], \
3860 &mips_reg_names[29][0], \
3861 &mips_reg_names[30][0], \
3862 &mips_reg_names[31][0], \
3863 &mips_reg_names[32][0], \
3864 &mips_reg_names[33][0], \
3865 &mips_reg_names[34][0], \
3866 &mips_reg_names[35][0], \
3867 &mips_reg_names[36][0], \
3868 &mips_reg_names[37][0], \
3869 &mips_reg_names[38][0], \
3870 &mips_reg_names[39][0], \
3871 &mips_reg_names[40][0], \
3872 &mips_reg_names[41][0], \
3873 &mips_reg_names[42][0], \
3874 &mips_reg_names[43][0], \
3875 &mips_reg_names[44][0], \
3876 &mips_reg_names[45][0], \
3877 &mips_reg_names[46][0], \
3878 &mips_reg_names[47][0], \
3879 &mips_reg_names[48][0], \
3880 &mips_reg_names[49][0], \
3881 &mips_reg_names[50][0], \
3882 &mips_reg_names[51][0], \
3883 &mips_reg_names[52][0], \
3884 &mips_reg_names[53][0], \
3885 &mips_reg_names[54][0], \
3886 &mips_reg_names[55][0], \
3887 &mips_reg_names[56][0], \
3888 &mips_reg_names[57][0], \
3889 &mips_reg_names[58][0], \
3890 &mips_reg_names[59][0], \
3891 &mips_reg_names[60][0], \
3892 &mips_reg_names[61][0], \
3893 &mips_reg_names[62][0], \
3894 &mips_reg_names[63][0], \
3895 &mips_reg_names[64][0], \
3896 &mips_reg_names[65][0], \
3897 &mips_reg_names[66][0], \
3898 &mips_reg_names[67][0], \
3899 &mips_reg_names[68][0], \
3900 &mips_reg_names[69][0], \
3901 &mips_reg_names[70][0], \
3902 &mips_reg_names[71][0], \
3903 &mips_reg_names[72][0], \
3904 &mips_reg_names[73][0], \
3905 &mips_reg_names[74][0], \
3906 &mips_reg_names[75][0], \
3907 }
3909 /* print-rtl.c can't use REGISTER_NAMES, since it depends on mips.c.
3910 So define this for it. */
3911 #define DEBUG_REGISTER_NAMES \
3912 { \
3923 }
3925 /* If defined, a C initializer for an array of structures
3926 containing a name and a register number. This macro defines
3927 additional names for hard registers, thus allowing the `asm'
3928 option in declarations to refer to registers using alternate
3929 names.
3931 We define both names for the integer registers here. */
3933 #define ADDITIONAL_REGISTER_NAMES \
3934 { \
4002 }
4004 /* A C compound statement to output to stdio stream STREAM the
4005 assembler syntax for an instruction operand X. X is an RTL
4006 expression.
4008 CODE is a value that can be used to specify one of several ways
4009 of printing the operand. It is used when identical operands
4010 must be printed differently depending on the context. CODE
4011 comes from the `%' specification that was used to request
4012 printing of the operand. If the specification was just `%DIGIT'
4013 then CODE is 0; if the specification was `%LTR DIGIT' then CODE
4014 is the ASCII code for LTR.
4016 If X is a register, this macro should print the register's name.
4017 The names can be found in an array `reg_names' whose type is
4018 `char *[]'. `reg_names' is initialized from `REGISTER_NAMES'.
4020 When the machine description has a specification `%PUNCT' (a `%'
4021 followed by a punctuation character), this macro is called with
4022 a null pointer for X and the punctuation character for CODE.
4024 See mips.c for the MIPS specific codes. */
4026 #define PRINT_OPERAND(FILE, X, CODE) print_operand (FILE, X, CODE)
4028 /* A C expression which evaluates to true if CODE is a valid
4029 punctuation character for use in the `PRINT_OPERAND' macro. If
4030 `PRINT_OPERAND_PUNCT_VALID_P' is not defined, it means that no
4031 punctuation characters (except for the standard one, `%') are
4032 used in this way. */
4034 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) mips_print_operand_punct[CODE]
4036 /* A C compound statement to output to stdio stream STREAM the
4037 assembler syntax for an instruction operand that is a memory
4038 reference whose address is ADDR. ADDR is an RTL expression.
4040 On some machines, the syntax for a symbolic address depends on
4041 the section that the address refers to. On these machines,
4042 define the macro `ENCODE_SECTION_INFO' to store the information
4043 into the `symbol_ref', and then check for it here. */
4045 #define PRINT_OPERAND_ADDRESS(FILE, ADDR) print_operand_address (FILE, ADDR)
4048 /* A C statement, to be executed after all slot-filler instructions
4049 have been output. If necessary, call `dbr_sequence_length' to
4050 determine the number of slots filled in a sequence (zero if not
4051 currently outputting a sequence), to decide how many no-ops to
4052 output, or whatever.
4054 Don't define this macro if it has nothing to do, but it is
4055 helpful in reading assembly output if the extent of the delay
4056 sequence is made explicit (e.g. with white space).
4058 Note that output routines for instructions with delay slots must
4059 be prepared to deal with not being output as part of a sequence
4060 (i.e. when the scheduling pass is not run, or when no slot
4061 fillers could be found.) The variable `final_sequence' is null
4062 when not processing a sequence, otherwise it contains the
4063 `sequence' rtx being output. */
4065 #define DBR_OUTPUT_SEQEND(STREAM) \
4066 do \
4067 { \
4068 if (set_nomacro > 0 && --set_nomacro == 0) \
4070 \
4071 if (set_noreorder > 0 && --set_noreorder == 0) \
4073 \
4074 dslots_jump_filled++; \
4076 } \
4077 while (0)
4080 /* How to tell the debugger about changes of source files. Note, the
4081 mips ECOFF format cannot deal with changes of files inside of
4082 functions, which means the output of parser generators like bison
4083 is generally not debuggable without using the -l switch. Lose,
4084 lose, lose. Silicon graphics seems to want all .file's hardwired
4085 to 1. */
4087 #ifndef SET_FILE_NUMBER
4088 #define SET_FILE_NUMBER() ++num_source_filenames
4089 #endif
4091 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
4092 mips_output_filename (STREAM, NAME)
4094 /* This is defined so that it can be overridden in iris6.h. */
4095 #define ASM_OUTPUT_FILENAME(STREAM, NUM_SOURCE_FILENAMES, NAME) \
4096 do \
4097 { \
4099 output_quoted_string (STREAM, NAME); \
4101 } \
4102 while (0)
4104 /* This is how to output a note the debugger telling it the line number
4105 to which the following sequence of instructions corresponds.
4106 Silicon graphics puts a label after each .loc. */
4108 #ifndef LABEL_AFTER_LOC
4109 #define LABEL_AFTER_LOC(STREAM)
4110 #endif
4112 #ifndef ASM_OUTPUT_SOURCE_LINE
4113 #define ASM_OUTPUT_SOURCE_LINE(STREAM, LINE) \
4114 mips_output_lineno (STREAM, LINE)
4115 #endif
4117 /* The MIPS implementation uses some labels for its own purpose. The
4118 following lists what labels are created, and are all formed by the
4119 pattern $L[a-z].*. The machine independent portion of GCC creates
4120 labels matching: $L[A-Z][0-9]+ and $L[0-9]+.
4122 LM[0-9]+ Silicon Graphics/ECOFF stabs label before each stmt.
4123 $Lb[0-9]+ Begin blocks for MIPS debug support
4124 $Lc[0-9]+ Label for use in s<xx> operation.
4125 $Le[0-9]+ End blocks for MIPS debug support
4126 $Lp\..+ Half-pic labels. */
4128 /* This is how to output the definition of a user-level label named NAME,
4129 such as the label on a static function or variable NAME.
4131 If we are optimizing the gp, remember that this label has been put
4132 out, so we know not to emit an .extern for it in mips_asm_file_end.
4133 We use one of the common bits in the IDENTIFIER tree node for this,
4134 since those bits seem to be unused, and we don't have any method
4135 of getting the decl nodes from the name. */
4137 #define ASM_OUTPUT_LABEL(STREAM,NAME) \
4138 do { \
4139 assemble_name (STREAM, NAME); \
4141 } while (0)
4144 /* A C statement (sans semicolon) to output to the stdio stream
4145 STREAM any text necessary for declaring the name NAME of an
4146 initialized variable which is being defined. This macro must
4147 output the label definition (perhaps using `ASM_OUTPUT_LABEL').
4148 The argument DECL is the `VAR_DECL' tree node representing the
4149 variable.
4151 If this macro is not defined, then the variable name is defined
4152 in the usual manner as a label (by means of `ASM_OUTPUT_LABEL'). */
4154 #undef ASM_DECLARE_OBJECT_NAME
4155 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL) \
4156 do \
4157 { \
4159 HALF_PIC_DECLARE (NAME); \
4160 } \
4161 while (0)
4164 /* This is how to output a command to make the user-level label named NAME
4165 defined for reference from other files. */
4167 #define ASM_GLOBALIZE_LABEL(STREAM,NAME) \
4168 do { \
4170 assemble_name (STREAM, NAME); \
4172 } while (0)
4174 /* This says how to define a global common symbol. */
4176 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(STREAM, DECL, NAME, SIZE, ALIGN) \
4177 do { \
4178 /* If the target wants uninitialized const declarations in \
4180 if (TARGET_EMBEDDED_DATA && TARGET_UNINIT_CONST_IN_RODATA \
4181 && TREE_CODE (DECL) == VAR_DECL && TREE_READONLY (DECL) \
4182 && (DECL_INITIAL (DECL) == 0 \
4183 || DECL_INITIAL (DECL) == error_mark_node)) \
4184 { \
4185 if (TREE_PUBLIC (DECL) && DECL_NAME (DECL)) \
4186 ASM_GLOBALIZE_LABEL (STREAM, NAME); \
4187 \
4188 READONLY_DATA_SECTION (); \
4189 ASM_OUTPUT_ALIGN (STREAM, floor_log2 (ALIGN / BITS_PER_UNIT)); \
4191 (SIZE)); \
4192 } \
4193 else \
4195 (SIZE)); \
4196 } while (0)
4199 /* This says how to define a local common symbol (ie, not visible to
4200 linker). */
4202 #define ASM_OUTPUT_LOCAL(STREAM, NAME, SIZE, ROUNDED) \
4206 /* This says how to output an external. It would be possible not to
4207 output anything and let undefined symbol become external. However
4208 the assembler uses length information on externals to allocate in
4209 data/sdata bss/sbss, thereby saving exec time. */
4211 #define ASM_OUTPUT_EXTERNAL(STREAM,DECL,NAME) \
4212 mips_output_external(STREAM,DECL,NAME)
4214 /* This says what to print at the end of the assembly file */
4215 #undef ASM_FILE_END
4216 #define ASM_FILE_END(STREAM) mips_asm_file_end(STREAM)
4219 /* Play switch file games if we're optimizing the global pointer. */
4221 #undef TEXT_SECTION
4222 #define TEXT_SECTION() \
4223 do { \
4224 extern FILE *asm_out_text_file; \
4225 if (TARGET_FILE_SWITCHING) \
4226 asm_out_file = asm_out_text_file; \
4227 fputs (TEXT_SECTION_ASM_OP, asm_out_file); \
4229 } while (0)
4232 /* This is how to declare a function name. The actual work of
4233 emitting the label is moved to function_prologue, so that we can
4234 get the line number correctly emitted before the .ent directive,
4235 and after any .file directives. */
4237 #undef ASM_DECLARE_FUNCTION_NAME
4238 #define ASM_DECLARE_FUNCTION_NAME(STREAM,NAME,DECL) \
4239 HALF_PIC_DECLARE (NAME)
4241 /* This is how to output an internal numbered label where
4242 PREFIX is the class of label and NUM is the number within the class. */
4244 #undef ASM_OUTPUT_INTERNAL_LABEL
4245 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM,PREFIX,NUM) \
4248 /* This is how to store into the string LABEL
4249 the symbol_ref name of an internal numbered label where
4250 PREFIX is the class of label and NUM is the number within the class.
4251 This is suitable for output with `assemble_name'. */
4253 #undef ASM_GENERATE_INTERNAL_LABEL
4254 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
4257 /* This is how to output an assembler line defining a `double' constant. */
4259 #define ASM_OUTPUT_DOUBLE(STREAM,VALUE) \
4260 mips_output_double (STREAM, VALUE)
4263 /* This is how to output an assembler line defining a `float' constant. */
4265 #define ASM_OUTPUT_FLOAT(STREAM,VALUE) \
4266 mips_output_float (STREAM, VALUE)
4269 /* This is how to output an assembler line defining an `int' constant. */
4271 #define ASM_OUTPUT_INT(STREAM,VALUE) \
4272 do { \
4274 output_addr_const (STREAM, (VALUE)); \
4276 } while (0)
4278 /* Likewise for 64 bit, `char' and `short' constants.
4280 FIXME: operand_subword can't handle some complex constant expressions
4281 that output_addr_const can (for example it does not call
4282 simplify_subtraction). Since GAS can handle dword, even for mipsII,
4283 rely on that to avoid operand_subword for most of the cases where this
4284 matters. Try gcc.c-torture/compile/930326-1.c with -mips2 -mlong64,
4285 or the same case with the type of 'i' changed to long long.
4287 */
4289 #define ASM_OUTPUT_DOUBLE_INT(STREAM,VALUE) \
4290 do { \
4291 if (TARGET_64BIT || TARGET_GAS) \
4292 { \
4294 if (HOST_BITS_PER_WIDE_INT < 64 || GET_CODE (VALUE) != CONST_INT) \
4295 /* We can't use 'X' for negative numbers, because then we won't \
4297 output_addr_const (STREAM, VALUE); \
4298 else \
4299 /* We must use 'X', because otherwise LONG_MIN will print as \
4303 } \
4304 else \
4305 { \
4306 assemble_integer (operand_subword ((VALUE), 0, 0, DImode), \
4307 UNITS_PER_WORD, BITS_PER_WORD, 1); \
4308 assemble_integer (operand_subword ((VALUE), 1, 0, DImode), \
4309 UNITS_PER_WORD, BITS_PER_WORD, 1); \
4310 } \
4311 } while (0)
4313 #define ASM_OUTPUT_SHORT(STREAM,VALUE) \
4314 { \
4316 output_addr_const (STREAM, (VALUE)); \
4318 }
4320 #define ASM_OUTPUT_CHAR(STREAM,VALUE) \
4321 { \
4323 output_addr_const (STREAM, (VALUE)); \
4325 }
4327 /* This is how to output an assembler line for a numeric constant byte. */
4329 #define ASM_OUTPUT_BYTE(STREAM,VALUE) \
4332 /* This is how to output an element of a case-vector that is absolute. */
4334 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
4337 LOCAL_LABEL_PREFIX, \
4338 VALUE)
4340 /* This is how to output an element of a case-vector that is relative.
4341 This is used for pc-relative code (e.g. when TARGET_ABICALLS or
4342 TARGET_EMBEDDED_PIC). */
4344 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
4345 do { \
4346 if (TARGET_MIPS16) \
4348 LOCAL_LABEL_PREFIX, VALUE, LOCAL_LABEL_PREFIX, REL); \
4349 else if (TARGET_EMBEDDED_PIC) \
4352 LOCAL_LABEL_PREFIX, VALUE, LOCAL_LABEL_PREFIX, REL); \
4353 else if (mips_abi == ABI_32 || mips_abi == ABI_O64) \
4356 LOCAL_LABEL_PREFIX, VALUE); \
4357 else \
4360 LOCAL_LABEL_PREFIX, VALUE); \
4361 } while (0)
4363 /* When generating embedded PIC or mips16 code we want to put the jump
4364 table in the .text section. In all other cases, we want to put the
4365 jump table in the .rdata section. Unfortunately, we can't use
4366 JUMP_TABLES_IN_TEXT_SECTION, because it is not conditional.
4367 Instead, we use ASM_OUTPUT_CASE_LABEL to switch back to the .text
4368 section if appropriate. */
4369 #undef ASM_OUTPUT_CASE_LABEL
4370 #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, INSN) \
4371 do { \
4372 if (TARGET_EMBEDDED_PIC || TARGET_MIPS16) \
4373 function_section (current_function_decl); \
4374 ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \
4375 } while (0)
4377 /* This is how to output an assembler line
4378 that says to advance the location counter
4379 to a multiple of 2**LOG bytes. */
4381 #define ASM_OUTPUT_ALIGN(STREAM,LOG) \
4384 /* This is how to output an assembler line to advance the location
4385 counter by SIZE bytes. */
4387 #undef ASM_OUTPUT_SKIP
4388 #define ASM_OUTPUT_SKIP(STREAM,SIZE) \
4391 /* This is how to output a string. */
4392 #undef ASM_OUTPUT_ASCII
4393 #define ASM_OUTPUT_ASCII(STREAM, STRING, LEN) \
4394 mips_output_ascii (STREAM, STRING, LEN)
4396 /* Handle certain cpp directives used in header files on sysV. */
4397 #define SCCS_DIRECTIVE
4399 #ifndef ASM_OUTPUT_IDENT
4400 /* Output #ident as a in the read-only data section. */
4401 #define ASM_OUTPUT_IDENT(FILE, STRING) \
4402 { \
4403 const char *p = STRING; \
4404 int size = strlen (p) + 1; \
4405 rdata_section (); \
4406 assemble_string (p, size); \
4407 }
4408 #endif
4409 \f
4410 /* Default to -G 8 */
4411 #ifndef MIPS_DEFAULT_GVALUE
4412 #define MIPS_DEFAULT_GVALUE 8
4413 #endif
4415 /* Define the strings to put out for each section in the object file. */
4420 #undef READONLY_DATA_SECTION
4421 #define READONLY_DATA_SECTION rdata_section
4422 #define SMALL_DATA_SECTION sdata_section
4424 /* What other sections we support other than the normal .data/.text. */
4426 #undef EXTRA_SECTIONS
4427 #define EXTRA_SECTIONS in_sdata, in_rdata
4429 /* Define the additional functions to select our additional sections. */
4431 /* on the MIPS it is not a good idea to put constants in the text
4432 section, since this defeats the sdata/data mechanism. This is
4433 especially true when -O is used. In this case an effort is made to
4434 address with faster (gp) register relative addressing, which can
4435 only get at sdata and sbss items (there is no stext !!) However,
4436 if the constant is too large for sdata, and it's readonly, it
4437 will go into the .rdata section. */
4439 #undef EXTRA_SECTION_FUNCTIONS
4440 #define EXTRA_SECTION_FUNCTIONS \
4441 void \
4442 sdata_section () \
4443 { \
4444 if (in_section != in_sdata) \
4445 { \
4447 in_section = in_sdata; \
4448 } \
4449 } \
4450 \
4451 void \
4452 rdata_section () \
4453 { \
4454 if (in_section != in_rdata) \
4455 { \
4457 in_section = in_rdata; \
4458 } \
4459 }
4461 /* Given a decl node or constant node, choose the section to output it in
4462 and select that section. */
4464 #undef SELECT_RTX_SECTION
4465 #define SELECT_RTX_SECTION(MODE,RTX) mips_select_rtx_section (MODE, RTX)
4467 #undef SELECT_SECTION
4468 #define SELECT_SECTION(DECL, RELOC) mips_select_section (DECL, RELOC)
4470 \f
4471 /* Store in OUTPUT a string (made with alloca) containing
4472 an assembler-name for a local static variable named NAME.
4473 LABELNO is an integer which is different for each call. */
4475 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
4476 ( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 10), \
4479 #define ASM_OUTPUT_REG_PUSH(STREAM,REGNO) \
4480 do \
4481 { \
4484 reg_names[STACK_POINTER_REGNUM], \
4485 reg_names[STACK_POINTER_REGNUM], \
4487 reg_names[REGNO], \
4488 reg_names[STACK_POINTER_REGNUM]); \
4489 } \
4490 while (0)
4492 #define ASM_OUTPUT_REG_POP(STREAM,REGNO) \
4493 do \
4494 { \
4495 if (! set_noreorder) \
4497 \
4498 dslots_load_total++; \
4499 dslots_load_filled++; \
4502 reg_names[REGNO], \
4503 reg_names[STACK_POINTER_REGNUM], \
4505 reg_names[STACK_POINTER_REGNUM], \
4506 reg_names[STACK_POINTER_REGNUM]); \
4507 \
4508 if (! set_noreorder) \
4510 } \
4511 while (0)
4513 /* How to start an assembler comment.
4514 The leading space is important (the mips native assembler requires it). */
4515 #ifndef ASM_COMMENT_START
4517 #endif
4518 \f
4520 /* Macros for mips-tfile.c to encapsulate stabs in ECOFF, and for
4521 and mips-tdump.c to print them out.
4523 These must match the corresponding definitions in gdb/mipsread.c.
4524 Unfortunately, gcc and gdb do not currently share any directories. */
4526 #define CODE_MASK 0x8F300
4527 #define MIPS_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK)
4528 #define MIPS_MARK_STAB(code) ((code)+CODE_MASK)
4529 #define MIPS_UNMARK_STAB(code) ((code)-CODE_MASK)
4531 \f
4532 /* Default definitions for size_t and ptrdiff_t. */
4534 #ifndef SIZE_TYPE
4535 #define NO_BUILTIN_SIZE_TYPE
4537 #endif
4539 #ifndef PTRDIFF_TYPE
4540 #define NO_BUILTIN_PTRDIFF_TYPE
4542 #endif
4544 /* See mips_expand_prologue's use of loadgp for when this should be
4545 true. */
4547 #define DONT_ACCESS_GBLS_AFTER_EPILOGUE (TARGET_ABICALLS \
4548 && mips_abi != ABI_32 \
4549 && mips_abi != ABI_O64)
4550 \f
4551 /* In mips16 mode, we need to look through the function to check for
4552 PC relative loads that are out of range. */
4553 #define MACHINE_DEPENDENT_REORG(X) machine_dependent_reorg (X)
4555 /* We need to use a special set of functions to handle hard floating
4556 point code in mips16 mode. */
4558 #ifndef INIT_SUBTARGET_OPTABS
4559 #define INIT_SUBTARGET_OPTABS
4560 #endif
4562 #define INIT_TARGET_OPTABS \
4563 do \
4564 { \
4565 if (! TARGET_MIPS16 || ! mips16_hard_float) \
4566 INIT_SUBTARGET_OPTABS; \
4567 else \
4568 { \
4569 add_optab->handlers[(int) SFmode].libfunc = \
4571 sub_optab->handlers[(int) SFmode].libfunc = \
4573 smul_optab->handlers[(int) SFmode].libfunc = \
4575 sdiv_optab->handlers[(int) SFmode].libfunc = \
4577 \
4584 \
4585 floatsisf_libfunc = \
4587 fixsfsi_libfunc = \
4589 \
4590 if (TARGET_DOUBLE_FLOAT) \
4591 { \
4592 add_optab->handlers[(int) DFmode].libfunc = \
4594 sub_optab->handlers[(int) DFmode].libfunc = \
4596 smul_optab->handlers[(int) DFmode].libfunc = \
4598 sdiv_optab->handlers[(int) DFmode].libfunc = \
4600 \
4601 extendsfdf2_libfunc = \
4603 truncdfsf2_libfunc = \
4605 \
4606 eqdf2_libfunc = \
4608 nedf2_libfunc = \
4610 gtdf2_libfunc = \
4612 gedf2_libfunc = \
4614 ltdf2_libfunc = \
4616 ledf2_libfunc = \
4618 \
4619 floatsidf_libfunc = \
4621 fixdfsi_libfunc = \
4623 } \
4624 } \
4625 } \
4626 while (0)