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1 /* Definitions of target machine for GNU compiler, for IBM S/390
2 Copyright (C) 1999-2017 Free Software Foundation, Inc.
3 Contributed by Hartmut Penner (hpenner@de.ibm.com) and
4 Ulrich Weigand (uweigand@de.ibm.com).
5 Andreas Krebbel (Andreas.Krebbel@de.ibm.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
12 version.
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
23 #ifndef _S390_H
24 #define _S390_H
26 /* Optional architectural facilities supported by the processor. */
28 enum processor_flags
29 {
43 };
45 /* This is necessary to avoid a warning about comparing different enum
46 types. */
47 #define s390_tune_attr ((enum attr_cpu)(s390_tune > PROCESSOR_2964_Z13 ? PROCESSOR_2964_Z13 : s390_tune ))
49 /* These flags indicate that the generated code should run on a cpu
50 providing the respective hardware facility regardless of the
51 current cpu mode (ESA or z/Architecture). */
53 #define TARGET_CPU_IEEE_FLOAT \
54 (s390_arch_flags & PF_IEEE_FLOAT)
55 #define TARGET_CPU_IEEE_FLOAT_P(opts) \
56 (opts->x_s390_arch_flags & PF_IEEE_FLOAT)
57 #define TARGET_CPU_ZARCH \
58 (s390_arch_flags & PF_ZARCH)
59 #define TARGET_CPU_ZARCH_P(opts) \
60 (opts->x_s390_arch_flags & PF_ZARCH)
61 #define TARGET_CPU_LONG_DISPLACEMENT \
62 (s390_arch_flags & PF_LONG_DISPLACEMENT)
63 #define TARGET_CPU_LONG_DISPLACEMENT_P(opts) \
64 (opts->x_s390_arch_flags & PF_LONG_DISPLACEMENT)
65 #define TARGET_CPU_EXTIMM \
66 (s390_arch_flags & PF_EXTIMM)
67 #define TARGET_CPU_EXTIMM_P(opts) \
68 (opts->x_s390_arch_flags & PF_EXTIMM)
69 #define TARGET_CPU_DFP \
70 (s390_arch_flags & PF_DFP)
71 #define TARGET_CPU_DFP_P(opts) \
72 (opts->x_s390_arch_flags & PF_DFP)
73 #define TARGET_CPU_Z10 \
74 (s390_arch_flags & PF_Z10)
75 #define TARGET_CPU_Z10_P(opts) \
76 (opts->x_s390_arch_flags & PF_Z10)
77 #define TARGET_CPU_Z196 \
78 (s390_arch_flags & PF_Z196)
79 #define TARGET_CPU_Z196_P(opts) \
80 (opts->x_s390_arch_flags & PF_Z196)
81 #define TARGET_CPU_ZEC12 \
82 (s390_arch_flags & PF_ZEC12)
83 #define TARGET_CPU_ZEC12_P(opts) \
84 (opts->x_s390_arch_flags & PF_ZEC12)
85 #define TARGET_CPU_HTM \
86 (s390_arch_flags & PF_TX)
87 #define TARGET_CPU_HTM_P(opts) \
88 (opts->x_s390_arch_flags & PF_TX)
89 #define TARGET_CPU_Z13 \
90 (s390_arch_flags & PF_Z13)
91 #define TARGET_CPU_Z13_P(opts) \
92 (opts->x_s390_arch_flags & PF_Z13)
93 #define TARGET_CPU_VX \
94 (s390_arch_flags & PF_VX)
95 #define TARGET_CPU_VX_P(opts) \
96 (opts->x_s390_arch_flags & PF_VX)
97 #define TARGET_CPU_ARCH12 \
98 (s390_arch_flags & PF_ARCH12)
99 #define TARGET_CPU_ARCH12_P(opts) \
100 (opts->x_s390_arch_flags & PF_ARCH12)
101 #define TARGET_CPU_VXE \
102 (s390_arch_flags & PF_VXE)
103 #define TARGET_CPU_VXE_P(opts) \
104 (opts->x_s390_arch_flags & PF_VXE)
106 #define TARGET_HARD_FLOAT_P(opts) (!TARGET_SOFT_FLOAT_P(opts))
108 /* These flags indicate that the generated code should run on a cpu
109 providing the respective hardware facility when run in
110 z/Architecture mode. */
112 #define TARGET_LONG_DISPLACEMENT \
113 (TARGET_ZARCH && TARGET_CPU_LONG_DISPLACEMENT)
114 #define TARGET_LONG_DISPLACEMENT_P(opts) \
115 (TARGET_ZARCH_P (opts->x_target_flags) \
116 && TARGET_CPU_LONG_DISPLACEMENT_P (opts))
117 #define TARGET_EXTIMM \
118 (TARGET_ZARCH && TARGET_CPU_EXTIMM)
119 #define TARGET_EXTIMM_P(opts) \
120 (TARGET_ZARCH_P (opts->x_target_flags) && TARGET_CPU_EXTIMM_P (opts))
121 #define TARGET_DFP \
122 (TARGET_ZARCH && TARGET_CPU_DFP && TARGET_HARD_FLOAT)
123 #define TARGET_DFP_P(opts) \
124 (TARGET_ZARCH_P (opts->x_target_flags) && TARGET_CPU_DFP_P (opts) \
125 && TARGET_HARD_FLOAT_P (opts->x_target_flags))
126 #define TARGET_Z10 \
127 (TARGET_ZARCH && TARGET_CPU_Z10)
128 #define TARGET_Z10_P(opts) \
129 (TARGET_ZARCH_P (opts->x_target_flags) && TARGET_CPU_Z10_P (opts))
130 #define TARGET_Z196 \
131 (TARGET_ZARCH && TARGET_CPU_Z196)
132 #define TARGET_Z196_P(opts) \
133 (TARGET_ZARCH_P (opts->x_target_flags) && TARGET_CPU_Z196_P (opts))
134 #define TARGET_ZEC12 \
135 (TARGET_ZARCH && TARGET_CPU_ZEC12)
136 #define TARGET_ZEC12_P(opts) \
137 (TARGET_ZARCH_P (opts->x_target_flags) && TARGET_CPU_ZEC12_P (opts))
138 #define TARGET_HTM (TARGET_OPT_HTM)
139 #define TARGET_HTM_P(opts) (TARGET_OPT_HTM_P (opts->x_target_flags))
140 #define TARGET_Z13 \
141 (TARGET_ZARCH && TARGET_CPU_Z13)
142 #define TARGET_Z13_P(opts) \
143 (TARGET_ZARCH_P (opts->x_target_flags) && TARGET_CPU_Z13_P (opts))
144 #define TARGET_VX \
145 (TARGET_ZARCH && TARGET_CPU_VX && TARGET_OPT_VX && TARGET_HARD_FLOAT)
146 #define TARGET_VX_P(opts) \
147 (TARGET_ZARCH_P (opts->x_target_flags) && TARGET_CPU_VX_P (opts) \
148 && TARGET_OPT_VX_P (opts->x_target_flags) \
149 && TARGET_HARD_FLOAT_P (opts->x_target_flags))
150 #define TARGET_ARCH12 (TARGET_ZARCH && TARGET_CPU_ARCH12)
151 #define TARGET_ARCH12_P(opts) \
152 (TARGET_ZARCH_P (opts->x_target_flags) && TARGET_CPU_ARCH12_P (opts))
153 #define TARGET_VXE \
154 (TARGET_VX && TARGET_CPU_VXE)
155 #define TARGET_VXE_P(opts) \
156 (TARGET_VX_P (opts) && TARGET_CPU_VXE_P (opts))
158 #ifdef HAVE_AS_MACHINE_MACHINEMODE
159 #define S390_USE_TARGET_ATTRIBUTE 1
160 #else
161 #define S390_USE_TARGET_ATTRIBUTE 0
162 #endif
164 #ifdef HAVE_AS_ARCHITECTURE_MODIFIERS
165 #define S390_USE_ARCHITECTURE_MODIFIERS 1
166 #else
167 #define S390_USE_ARCHITECTURE_MODIFIERS 0
168 #endif
170 #if S390_USE_TARGET_ATTRIBUTE
171 /* For switching between functions with different target attributes. */
172 #define SWITCHABLE_TARGET 1
173 #endif
175 #define TARGET_SUPPORTS_WIDE_INT 1
177 /* Use the ABI introduced with IBM z13:
178 - pass vector arguments <= 16 bytes in VRs
179 - align *all* vector types to 8 bytes */
180 #define TARGET_VX_ABI TARGET_VX
182 #define TARGET_AVOID_CMP_AND_BRANCH (s390_tune == PROCESSOR_2817_Z196)
184 /* Run-time target specification. */
186 /* Defaults for option flags defined only on some subtargets. */
187 #ifndef TARGET_TPF_PROFILING
188 #define TARGET_TPF_PROFILING 0
189 #endif
191 /* This will be overridden by OS headers. */
192 #define TARGET_TPF 0
194 /* Target CPU builtins. */
195 #define TARGET_CPU_CPP_BUILTINS() s390_cpu_cpp_builtins (pfile)
197 #ifdef DEFAULT_TARGET_64BIT
198 #define TARGET_DEFAULT (MASK_64BIT | MASK_ZARCH | MASK_HARD_DFP \
199 | MASK_OPT_HTM | MASK_OPT_VX)
200 #else
201 #define TARGET_DEFAULT 0
202 #endif
204 /* Support for configure-time defaults. */
205 #define OPTION_DEFAULT_SPECS \
210 #ifdef __s390__
212 # define EXTRA_SPEC_FUNCTIONS \
215 #define MARCH_MTUNE_NATIVE_SPECS \
218 " %:local_cpu_detect(arch %{mesa|mzarch:mesa_mzarch})}"
219 #else
221 #endif
223 #ifdef DEFAULT_TARGET_64BIT
225 #else
227 #endif
229 /* Defaulting rules. */
230 #define DRIVER_SELF_SPECS \
231 MARCH_MTUNE_NATIVE_SPECS, \
234 "%{!march=*:-march=z900}"
236 /* Constants needed to control the TEST DATA CLASS (TDC) instruction. */
237 #define S390_TDC_POSITIVE_ZERO (1 << 11)
238 #define S390_TDC_NEGATIVE_ZERO (1 << 10)
239 #define S390_TDC_POSITIVE_NORMALIZED_BFP_NUMBER (1 << 9)
240 #define S390_TDC_NEGATIVE_NORMALIZED_BFP_NUMBER (1 << 8)
241 #define S390_TDC_POSITIVE_DENORMALIZED_BFP_NUMBER (1 << 7)
242 #define S390_TDC_NEGATIVE_DENORMALIZED_BFP_NUMBER (1 << 6)
243 #define S390_TDC_POSITIVE_INFINITY (1 << 5)
244 #define S390_TDC_NEGATIVE_INFINITY (1 << 4)
245 #define S390_TDC_POSITIVE_QUIET_NAN (1 << 3)
246 #define S390_TDC_NEGATIVE_QUIET_NAN (1 << 2)
247 #define S390_TDC_POSITIVE_SIGNALING_NAN (1 << 1)
248 #define S390_TDC_NEGATIVE_SIGNALING_NAN (1 << 0)
250 /* The following values are different for DFP. */
251 #define S390_TDC_POSITIVE_DENORMALIZED_DFP_NUMBER (1 << 9)
252 #define S390_TDC_NEGATIVE_DENORMALIZED_DFP_NUMBER (1 << 8)
253 #define S390_TDC_POSITIVE_NORMALIZED_DFP_NUMBER (1 << 7)
254 #define S390_TDC_NEGATIVE_NORMALIZED_DFP_NUMBER (1 << 6)
256 /* For signbit, the BFP-DFP-difference makes no difference. */
257 #define S390_TDC_SIGNBIT_SET (S390_TDC_NEGATIVE_ZERO \
258 | S390_TDC_NEGATIVE_NORMALIZED_BFP_NUMBER \
259 | S390_TDC_NEGATIVE_DENORMALIZED_BFP_NUMBER\
260 | S390_TDC_NEGATIVE_INFINITY \
261 | S390_TDC_NEGATIVE_QUIET_NAN \
262 | S390_TDC_NEGATIVE_SIGNALING_NAN )
264 #define S390_TDC_INFINITY (S390_TDC_POSITIVE_INFINITY \
265 | S390_TDC_NEGATIVE_INFINITY )
267 /* Target machine storage layout. */
269 /* Everything is big-endian. */
270 #define BITS_BIG_ENDIAN 1
271 #define BYTES_BIG_ENDIAN 1
272 #define WORDS_BIG_ENDIAN 1
274 #define STACK_SIZE_MODE (Pmode)
276 /* Vector arguments are left-justified when placed on the stack during
277 parameter passing. */
278 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
279 (s390_function_arg_vector ((MODE), (TYPE)) \
280 ? upward \
281 : DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE)))
283 #ifndef IN_LIBGCC2
285 /* Width of a word, in units (bytes). */
286 #define UNITS_PER_WORD (TARGET_ZARCH ? 8 : 4)
288 /* Width of a pointer. To be used instead of UNITS_PER_WORD in
289 ABI-relevant contexts. This always matches
290 GET_MODE_SIZE (Pmode). */
291 #define UNITS_PER_LONG (TARGET_64BIT ? 8 : 4)
292 #define MIN_UNITS_PER_WORD 4
293 #define MAX_BITS_PER_WORD 64
294 #else
296 /* In libgcc, UNITS_PER_WORD has ABI-relevant effects, e.g. whether
297 the library should export TImode functions or not. Thus, we have
298 to redefine UNITS_PER_WORD depending on __s390x__ for libgcc. */
299 #ifdef __s390x__
300 #define UNITS_PER_WORD 8
301 #else
302 #define UNITS_PER_WORD 4
303 #endif
304 #endif
306 /* Width of a pointer, in bits. */
307 #define POINTER_SIZE (TARGET_64BIT ? 64 : 32)
309 /* Allocation boundary (in *bits*) for storing arguments in argument list. */
310 #define PARM_BOUNDARY (TARGET_64BIT ? 64 : 32)
312 /* Boundary (in *bits*) on which stack pointer should be aligned. */
313 #define STACK_BOUNDARY 64
315 /* Allocation boundary (in *bits*) for the code of a function. */
316 #define FUNCTION_BOUNDARY 64
318 /* There is no point aligning anything to a rounder boundary than this. */
319 #define BIGGEST_ALIGNMENT 64
321 /* Alignment of field after `int : 0' in a structure. */
322 #define EMPTY_FIELD_BOUNDARY 32
324 /* Alignment on even addresses for LARL instruction. */
325 #define CONSTANT_ALIGNMENT(EXP, ALIGN) (ALIGN) < 16 ? 16 : (ALIGN)
326 #define DATA_ABI_ALIGNMENT(TYPE, ALIGN) (ALIGN) < 16 ? 16 : (ALIGN)
328 /* Alignment is not required by the hardware. */
329 #define STRICT_ALIGNMENT 0
331 /* Mode of stack savearea.
332 FUNCTION is VOIDmode because calling convention maintains SP.
333 BLOCK needs Pmode for SP.
334 NONLOCAL needs twice Pmode to maintain both backchain and SP. */
335 #define STACK_SAVEAREA_MODE(LEVEL) \
336 ((LEVEL) == SAVE_FUNCTION ? VOIDmode \
337 : (LEVEL) == SAVE_NONLOCAL ? (TARGET_64BIT ? OImode : TImode) : Pmode)
340 /* Type layout. */
342 /* Sizes in bits of the source language data types. */
343 #define SHORT_TYPE_SIZE 16
344 #define INT_TYPE_SIZE 32
345 #define LONG_TYPE_SIZE (TARGET_64BIT ? 64 : 32)
346 #define LONG_LONG_TYPE_SIZE 64
347 #define FLOAT_TYPE_SIZE 32
348 #define DOUBLE_TYPE_SIZE 64
349 #define LONG_DOUBLE_TYPE_SIZE (TARGET_LONG_DOUBLE_128 ? 128 : 64)
351 /* Work around target_flags dependency in ada/targtyps.c. */
352 #define WIDEST_HARDWARE_FP_SIZE 64
354 /* We use "unsigned char" as default. */
355 #define DEFAULT_SIGNED_CHAR 0
358 /* Register usage. */
360 /* We have 16 general purpose registers (registers 0-15),
361 and 16 floating point registers (registers 16-31).
362 (On non-IEEE machines, we have only 4 fp registers.)
364 Amongst the general purpose registers, some are used
365 for specific purposes:
366 GPR 11: Hard frame pointer (if needed)
367 GPR 12: Global offset table pointer (if needed)
368 GPR 13: Literal pool base register
369 GPR 14: Return address register
370 GPR 15: Stack pointer
372 Registers 32-35 are 'fake' hard registers that do not
373 correspond to actual hardware:
374 Reg 32: Argument pointer
375 Reg 33: Condition code
376 Reg 34: Frame pointer
377 Reg 35: Return address pointer
379 Registers 36 and 37 are mapped to access registers
380 0 and 1, used to implement thread-local storage.
382 Reg 38-53: Vector registers v16-v31 */
384 #define FIRST_PSEUDO_REGISTER 54
386 /* Standard register usage. */
387 #define GENERAL_REGNO_P(N) ((int)(N) >= 0 && (N) < 16)
388 #define ADDR_REGNO_P(N) ((N) >= 1 && (N) < 16)
389 #define FP_REGNO_P(N) ((N) >= 16 && (N) < 32)
390 #define CC_REGNO_P(N) ((N) == 33)
391 #define FRAME_REGNO_P(N) ((N) == 32 || (N) == 34 || (N) == 35)
392 #define ACCESS_REGNO_P(N) ((N) == 36 || (N) == 37)
393 #define VECTOR_NOFP_REGNO_P(N) ((N) >= 38 && (N) <= 53)
394 #define VECTOR_REGNO_P(N) (FP_REGNO_P (N) || VECTOR_NOFP_REGNO_P (N))
396 #define GENERAL_REG_P(X) (REG_P (X) && GENERAL_REGNO_P (REGNO (X)))
397 #define ADDR_REG_P(X) (REG_P (X) && ADDR_REGNO_P (REGNO (X)))
398 #define FP_REG_P(X) (REG_P (X) && FP_REGNO_P (REGNO (X)))
399 #define CC_REG_P(X) (REG_P (X) && CC_REGNO_P (REGNO (X)))
400 #define FRAME_REG_P(X) (REG_P (X) && FRAME_REGNO_P (REGNO (X)))
401 #define ACCESS_REG_P(X) (REG_P (X) && ACCESS_REGNO_P (REGNO (X)))
402 #define VECTOR_NOFP_REG_P(X) (REG_P (X) && VECTOR_NOFP_REGNO_P (REGNO (X)))
403 #define VECTOR_REG_P(X) (REG_P (X) && VECTOR_REGNO_P (REGNO (X)))
405 /* Set up fixed registers and calling convention:
407 GPRs 0-5 are always call-clobbered,
408 GPRs 6-15 are always call-saved.
409 GPR 12 is fixed if used as GOT pointer.
410 GPR 13 is always fixed (as literal pool pointer).
411 GPR 14 is always fixed on S/390 machines (as return address).
412 GPR 15 is always fixed (as stack pointer).
413 The 'fake' hard registers are call-clobbered and fixed.
414 The access registers are call-saved and fixed.
416 On 31-bit, FPRs 18-19 are call-clobbered;
417 on 64-bit, FPRs 24-31 are call-clobbered.
418 The remaining FPRs are call-saved.
420 All non-FP vector registers are call-clobbered v16-v31. */
422 #define FIXED_REGISTERS \
423 { 0, 0, 0, 0, \
424 0, 0, 0, 0, \
425 0, 0, 0, 0, \
426 0, 1, 1, 1, \
427 0, 0, 0, 0, \
428 0, 0, 0, 0, \
429 0, 0, 0, 0, \
430 0, 0, 0, 0, \
431 1, 1, 1, 1, \
432 1, 1, \
433 0, 0, 0, 0, \
434 0, 0, 0, 0, \
435 0, 0, 0, 0, \
436 0, 0, 0, 0 }
438 #define CALL_USED_REGISTERS \
439 { 1, 1, 1, 1, \
440 1, 1, 0, 0, \
441 0, 0, 0, 0, \
442 0, 1, 1, 1, \
443 1, 1, 1, 1, \
444 1, 1, 1, 1, \
445 1, 1, 1, 1, \
446 1, 1, 1, 1, \
447 1, 1, 1, 1, \
448 1, 1, \
449 1, 1, 1, 1, \
450 1, 1, 1, 1, \
451 1, 1, 1, 1, \
452 1, 1, 1, 1 }
454 #define CALL_REALLY_USED_REGISTERS \
456 1, 1, 0, 0, \
457 0, 0, 0, 0, \
458 0, 0, 0, 0, \
460 1, 1, 1, 1, \
461 1, 1, 1, 1, \
462 1, 1, 1, 1, \
466 1, 1, 1, 1, \
468 1, 1, 1, 1 }
470 /* Preferred register allocation order. */
471 #define REG_ALLOC_ORDER \
472 { 1, 2, 3, 4, 5, 0, 12, 11, 10, 9, 8, 7, 6, 14, 13, \
473 16, 17, 18, 19, 20, 21, 22, 23, \
474 24, 25, 26, 27, 28, 29, 30, 31, \
475 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, \
476 15, 32, 33, 34, 35, 36, 37 }
479 /* Fitting values into registers. */
481 /* Integer modes <= word size fit into any GPR.
482 Integer modes > word size fit into successive GPRs, starting with
483 an even-numbered register.
484 SImode and DImode fit into FPRs as well.
486 Floating point modes <= word size fit into any FPR or GPR.
487 Floating point modes > word size (i.e. DFmode on 32-bit) fit
488 into any FPR, or an even-odd GPR pair.
489 TFmode fits only into an even-odd FPR pair.
491 Complex floating point modes fit either into two FPRs, or into
492 successive GPRs (again starting with an even number).
493 TCmode fits only into two successive even-odd FPR pairs.
495 Condition code modes fit only into the CC register. */
497 /* Because all registers in a class have the same size HARD_REGNO_NREGS
498 is equivalent to CLASS_MAX_NREGS. */
499 #define HARD_REGNO_NREGS(REGNO, MODE) \
500 s390_class_max_nregs (REGNO_REG_CLASS (REGNO), (MODE))
502 #define HARD_REGNO_RENAME_OK(FROM, TO) \
503 s390_hard_regno_rename_ok ((FROM), (TO))
505 #define MODES_TIEABLE_P(MODE1, MODE2) \
506 (((MODE1) == SFmode || (MODE1) == DFmode) \
507 == ((MODE2) == SFmode || (MODE2) == DFmode))
509 /* Maximum number of registers to represent a value of mode MODE
510 in a register of class CLASS. */
511 #define CLASS_MAX_NREGS(CLASS, MODE) \
512 s390_class_max_nregs ((CLASS), (MODE))
514 #define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS) \
515 s390_cannot_change_mode_class ((FROM), (TO), (CLASS))
517 /* We can reverse a CC mode safely if we know whether it comes from a
518 floating point compare or not. With the vector modes it is encoded
519 as part of the mode.
520 FIXME: It might make sense to do this for other cc modes as well. */
521 #define REVERSIBLE_CC_MODE(MODE) \
522 ((MODE) == CCVIALLmode || (MODE) == CCVIANYmode \
523 || (MODE) == CCVFALLmode || (MODE) == CCVFANYmode)
525 /* Given a condition code and a mode, return the inverse condition. */
526 #define REVERSE_CONDITION(CODE, MODE) s390_reverse_condition (MODE, CODE)
529 /* Register classes. */
531 /* We use the following register classes:
532 GENERAL_REGS All general purpose registers
533 ADDR_REGS All general purpose registers except %r0
534 (These registers can be used in address generation)
535 FP_REGS All floating point registers
536 CC_REGS The condition code register
537 ACCESS_REGS The access registers
539 GENERAL_FP_REGS Union of GENERAL_REGS and FP_REGS
540 ADDR_FP_REGS Union of ADDR_REGS and FP_REGS
541 GENERAL_CC_REGS Union of GENERAL_REGS and CC_REGS
542 ADDR_CC_REGS Union of ADDR_REGS and CC_REGS
544 NO_REGS No registers
545 ALL_REGS All registers
547 Note that the 'fake' frame pointer and argument pointer registers
548 are included amongst the address registers here. */
550 enum reg_class
551 {
556 ALL_REGS, LIM_REG_CLASSES
557 };
558 #define N_REG_CLASSES (int) LIM_REG_CLASSES
560 #define REG_CLASS_NAMES \
567 /* Class -> register mapping. */
568 #define REG_CLASS_CONTENTS \
569 { \
584 }
586 /* In some case register allocation order is not enough for IRA to
587 generate a good code. The following macro (if defined) increases
588 cost of REGNO for a pseudo approximately by pseudo usage frequency
589 multiplied by the macro value.
591 We avoid usage of BASE_REGNUM by nonzero macro value because the
592 reload can decide not to use the hard register because some
593 constant was forced to be in memory. */
594 #define IRA_HARD_REGNO_ADD_COST_MULTIPLIER(regno) \
595 ((regno) != BASE_REGNUM ? 0.0 : 0.5)
597 /* Register -> class mapping. */
599 #define REGNO_REG_CLASS(REGNO) (regclass_map[REGNO])
601 /* ADDR_REGS can be used as base or index register. */
602 #define INDEX_REG_CLASS ADDR_REGS
603 #define BASE_REG_CLASS ADDR_REGS
605 /* Check whether REGNO is a hard register of the suitable class
606 or a pseudo register currently allocated to one such. */
607 #define REGNO_OK_FOR_INDEX_P(REGNO) \
608 (((REGNO) < FIRST_PSEUDO_REGISTER \
609 && REGNO_REG_CLASS ((REGNO)) == ADDR_REGS) \
610 || ADDR_REGNO_P (reg_renumber[REGNO]))
611 #define REGNO_OK_FOR_BASE_P(REGNO) REGNO_OK_FOR_INDEX_P (REGNO)
614 /* We need secondary memory to move data between GPRs and FPRs.
616 - With DFP the ldgr lgdr instructions are available. Due to the
617 different alignment we cannot use them for SFmode. For 31 bit a
618 64 bit value in GPR would be a register pair so here we still
619 need to go via memory.
621 - With z13 we can do the SF/SImode moves with vlgvf. Due to the
622 overlapping of FPRs and VRs we still disallow TF/TD modes to be
623 in full VRs so as before also on z13 we do these moves via
624 memory.
626 FIXME: Should we try splitting it into two vlgvg's/vlvg's instead? */
627 #define SECONDARY_MEMORY_NEEDED(CLASS1, CLASS2, MODE) \
628 (((reg_classes_intersect_p ((CLASS1), VEC_REGS) \
629 && reg_classes_intersect_p ((CLASS2), GENERAL_REGS)) \
630 || (reg_classes_intersect_p ((CLASS1), GENERAL_REGS) \
631 && reg_classes_intersect_p ((CLASS2), VEC_REGS))) \
632 && (!TARGET_DFP || !TARGET_64BIT || GET_MODE_SIZE (MODE) != 8) \
633 && (!TARGET_VX || (SCALAR_FLOAT_MODE_P (MODE) \
634 && GET_MODE_SIZE (MODE) > 8)))
636 /* Get_secondary_mem widens its argument to BITS_PER_WORD which loses on 64bit
637 because the movsi and movsf patterns don't handle r/f moves. */
638 #define SECONDARY_MEMORY_NEEDED_MODE(MODE) \
639 (GET_MODE_BITSIZE (MODE) < 32 \
640 ? mode_for_size (32, GET_MODE_CLASS (MODE), 0) \
641 : (MODE))
644 /* Stack layout and calling conventions. */
646 /* Our stack grows from higher to lower addresses. However, local variables
647 are accessed by positive offsets, and function arguments are stored at
648 increasing addresses. */
649 #define STACK_GROWS_DOWNWARD 1
650 #define FRAME_GROWS_DOWNWARD 1
651 /* #undef ARGS_GROW_DOWNWARD */
653 /* The basic stack layout looks like this: the stack pointer points
654 to the register save area for called functions. Above that area
655 is the location to place outgoing arguments. Above those follow
656 dynamic allocations (alloca), and finally the local variables. */
658 /* Offset from stack-pointer to first location of outgoing args. */
659 #define STACK_POINTER_OFFSET (TARGET_64BIT ? 160 : 96)
661 /* Offset within stack frame to start allocating local variables at. */
662 #define STARTING_FRAME_OFFSET 0
664 /* Offset from the stack pointer register to an item dynamically
665 allocated on the stack, e.g., by `alloca'. */
666 #define STACK_DYNAMIC_OFFSET(FUNDECL) \
667 (STACK_POINTER_OFFSET + crtl->outgoing_args_size)
669 /* Offset of first parameter from the argument pointer register value.
670 We have a fake argument pointer register that points directly to
671 the argument area. */
672 #define FIRST_PARM_OFFSET(FNDECL) 0
674 /* Defining this macro makes __builtin_frame_address(0) and
675 __builtin_return_address(0) work with -fomit-frame-pointer. */
676 #define INITIAL_FRAME_ADDRESS_RTX \
677 (plus_constant (Pmode, arg_pointer_rtx, -STACK_POINTER_OFFSET))
679 /* The return address of the current frame is retrieved
680 from the initial value of register RETURN_REGNUM.
681 For frames farther back, we use the stack slot where
682 the corresponding RETURN_REGNUM register was saved. */
683 #define DYNAMIC_CHAIN_ADDRESS(FRAME) \
684 (TARGET_PACKED_STACK ? \
685 plus_constant (Pmode, (FRAME), \
686 STACK_POINTER_OFFSET - UNITS_PER_LONG) : (FRAME))
688 /* For -mpacked-stack this adds 160 - 8 (96 - 4) to the output of
689 builtin_frame_address. Otherwise arg pointer -
690 STACK_POINTER_OFFSET would be returned for
691 __builtin_frame_address(0) what might result in an address pointing
692 somewhere into the middle of the local variables since the packed
693 stack layout generally does not need all the bytes in the register
694 save area. */
695 #define FRAME_ADDR_RTX(FRAME) \
696 DYNAMIC_CHAIN_ADDRESS ((FRAME))
698 #define RETURN_ADDR_RTX(COUNT, FRAME) \
699 s390_return_addr_rtx ((COUNT), DYNAMIC_CHAIN_ADDRESS ((FRAME)))
701 /* In 31-bit mode, we need to mask off the high bit of return addresses. */
702 #define MASK_RETURN_ADDR (TARGET_64BIT ? constm1_rtx : GEN_INT (0x7fffffff))
705 /* Exception handling. */
707 /* Describe calling conventions for DWARF-2 exception handling. */
708 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, RETURN_REGNUM)
709 #define INCOMING_FRAME_SP_OFFSET STACK_POINTER_OFFSET
710 #define DWARF_FRAME_RETURN_COLUMN 14
712 /* Describe how we implement __builtin_eh_return. */
713 #define EH_RETURN_DATA_REGNO(N) ((N) < 4 ? (N) + 6 : INVALID_REGNUM)
714 #define EH_RETURN_HANDLER_RTX gen_rtx_MEM (Pmode, return_address_pointer_rtx)
716 /* Select a format to encode pointers in exception handling data. */
717 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
718 (flag_pic \
719 ? ((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4 \
720 : DW_EH_PE_absptr)
722 /* Register save slot alignment. */
723 #define DWARF_CIE_DATA_ALIGNMENT (-UNITS_PER_LONG)
725 /* Let the assembler generate debug line info. */
726 #define DWARF2_ASM_LINE_DEBUG_INFO 1
728 /* Define the dwarf register mapping.
729 v16-v31 -> 68-83
730 rX -> X otherwise */
731 #define DBX_REGISTER_NUMBER(regno) \
732 (((regno) >= 38 && (regno) <= 53) ? (regno) + 30 : (regno))
734 /* Frame registers. */
736 #define STACK_POINTER_REGNUM 15
737 #define FRAME_POINTER_REGNUM 34
738 #define HARD_FRAME_POINTER_REGNUM 11
739 #define ARG_POINTER_REGNUM 32
740 #define RETURN_ADDRESS_POINTER_REGNUM 35
742 /* The static chain must be call-clobbered, but not used for
743 function argument passing. As register 1 is clobbered by
744 the trampoline code, we only have one option. */
745 #define STATIC_CHAIN_REGNUM 0
747 /* Number of hardware registers that go into the DWARF-2 unwind info.
748 To avoid ABI incompatibility, this number must not change even as
749 'fake' hard registers are added or removed. */
750 #define DWARF_FRAME_REGISTERS 34
753 /* Frame pointer and argument pointer elimination. */
755 #define ELIMINABLE_REGS \
756 {{ FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM }, \
757 { FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM }, \
758 { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM }, \
759 { ARG_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM }, \
760 { RETURN_ADDRESS_POINTER_REGNUM, STACK_POINTER_REGNUM }, \
761 { RETURN_ADDRESS_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM }, \
762 { BASE_REGNUM, BASE_REGNUM }}
764 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
765 (OFFSET) = s390_initial_elimination_offset ((FROM), (TO))
768 /* Stack arguments. */
770 /* We need current_function_outgoing_args to be valid. */
771 #define ACCUMULATE_OUTGOING_ARGS 1
774 /* Register arguments. */
777 {
781 }
782 CUMULATIVE_ARGS;
784 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, NN, N_NAMED_ARGS) \
785 ((CUM).gprs=0, (CUM).fprs=0, (CUM).vrs=0)
787 #define FIRST_VEC_ARG_REGNO 46
788 #define LAST_VEC_ARG_REGNO 53
790 /* Arguments can be placed in general registers 2 to 6, or in floating
791 point registers 0 and 2 for 31 bit and fprs 0, 2, 4 and 6 for 64
792 bit. */
793 #define FUNCTION_ARG_REGNO_P(N) \
794 (((N) >=2 && (N) < 7) || (N) == 16 || (N) == 17 \
795 || (TARGET_64BIT && ((N) == 18 || (N) == 19)) \
796 || (TARGET_VX && ((N) >= FIRST_VEC_ARG_REGNO && (N) <= LAST_VEC_ARG_REGNO)))
799 /* Only gpr 2, fpr 0, and v24 are ever used as return registers. */
800 #define FUNCTION_VALUE_REGNO_P(N) \
801 ((N) == 2 || (N) == 16 \
802 || (TARGET_VX && (N) == FIRST_VEC_ARG_REGNO))
805 /* Function entry and exit. */
807 /* When returning from a function, the stack pointer does not matter. */
808 #define EXIT_IGNORE_STACK 1
811 /* Profiling. */
813 #define FUNCTION_PROFILER(FILE, LABELNO) \
814 s390_function_profiler ((FILE), ((LABELNO)))
816 #define PROFILE_BEFORE_PROLOGUE 1
819 /* Trampolines for nested functions. */
821 #define TRAMPOLINE_SIZE (TARGET_64BIT ? 32 : 16)
822 #define TRAMPOLINE_ALIGNMENT BITS_PER_WORD
824 /* Addressing modes, and classification of registers for them. */
826 /* Recognize any constant value that is a valid address. */
827 #define CONSTANT_ADDRESS_P(X) 0
829 /* Maximum number of registers that can appear in a valid memory address. */
830 #define MAX_REGS_PER_ADDRESS 2
832 /* This definition replaces the formerly used 'm' constraint with a
833 different constraint letter in order to avoid changing semantics of
834 the 'm' constraint when accepting new address formats in
835 TARGET_LEGITIMATE_ADDRESS_P. The constraint letter defined here
836 must not be used in insn definitions or inline assemblies. */
839 /* Try a machine-dependent way of reloading an illegitimate address
840 operand. If we find one, push the reload and jump to WIN. This
841 macro is used in only one place: `find_reloads_address' in reload.c. */
842 #define LEGITIMIZE_RELOAD_ADDRESS(AD, MODE, OPNUM, TYPE, IND, WIN) \
843 do { \
844 rtx new_rtx = legitimize_reload_address ((AD), (MODE), \
845 (OPNUM), (int)(TYPE)); \
846 if (new_rtx) \
847 { \
848 (AD) = new_rtx; \
849 goto WIN; \
850 } \
851 } while (0)
853 /* Helper macro for s390.c and s390.md to check for symbolic constants. */
854 #define SYMBOLIC_CONST(X) \
855 (GET_CODE (X) == SYMBOL_REF \
856 || GET_CODE (X) == LABEL_REF \
857 || (GET_CODE (X) == CONST && symbolic_reference_mentioned_p (X)))
859 #define TLS_SYMBOLIC_CONST(X) \
860 ((GET_CODE (X) == SYMBOL_REF && tls_symbolic_operand (X)) \
861 || (GET_CODE (X) == CONST && tls_symbolic_reference_mentioned_p (X)))
864 /* Condition codes. */
866 /* Given a comparison code (EQ, NE, etc.) and the first operand of a COMPARE,
867 return the mode to be used for the comparison. */
868 #define SELECT_CC_MODE(OP, X, Y) s390_select_ccmode ((OP), (X), (Y))
870 /* Relative costs of operations. */
872 /* A C expression for the cost of a branch instruction. A value of 1
873 is the default; other values are interpreted relative to that. */
874 #define BRANCH_COST(speed_p, predictable_p) s390_branch_cost
876 /* Nonzero if access to memory by bytes is slow and undesirable. */
877 #define SLOW_BYTE_ACCESS 1
879 /* An integer expression for the size in bits of the largest integer machine
880 mode that should actually be used. We allow pairs of registers. */
881 #define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (TARGET_64BIT ? TImode : DImode)
883 /* The maximum number of bytes that a single instruction can move quickly
884 between memory and registers or between two memory locations. */
885 #define MOVE_MAX (TARGET_ZARCH ? 16 : 8)
886 #define MOVE_MAX_PIECES (TARGET_ZARCH ? 8 : 4)
887 #define MAX_MOVE_MAX 16
889 /* Don't perform CSE on function addresses. */
890 #define NO_FUNCTION_CSE 1
892 /* This value is used in tree-sra to decide whether it might benefical
893 to split a struct move into several word-size moves. For S/390
894 only small values make sense here since struct moves are relatively
895 cheap thanks to mvc so the small default value chosen for archs
896 with memmove patterns should be ok. But this value is multiplied
897 in tree-sra with UNITS_PER_WORD to make a decision so we adjust it
898 here to compensate for that factor since mvc costs exactly the same
899 on 31 and 64 bit. */
900 #define MOVE_RATIO(speed) (TARGET_64BIT? 2 : 4)
903 /* Sections. */
905 /* Output before read-only data. */
908 /* Output before writable (initialized) data. */
911 /* Output before writable (uninitialized) data. */
914 /* S/390 constant pool breaks the devices in crtstuff.c to control section
915 in where code resides. We have to write it as asm code. */
916 #ifndef __s390x__
917 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
924 #endif
927 /* Position independent code. */
929 #define PIC_OFFSET_TABLE_REGNUM (flag_pic ? 12 : INVALID_REGNUM)
931 #define LEGITIMATE_PIC_OPERAND_P(X) legitimate_pic_operand_p (X)
933 #ifndef TARGET_DEFAULT_PIC_DATA_IS_TEXT_RELATIVE
934 #define TARGET_DEFAULT_PIC_DATA_IS_TEXT_RELATIVE 1
935 #endif
938 /* Assembler file format. */
940 /* Character to start a comment. */
943 /* Declare an uninitialized external linkage data object. */
944 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
945 asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
947 /* Globalizing directive for a label. */
950 /* Advance the location counter to a multiple of 2**LOG bytes. */
951 #define ASM_OUTPUT_ALIGN(FILE, LOG) \
954 /* Advance the location counter by SIZE bytes. */
955 #define ASM_OUTPUT_SKIP(FILE, SIZE) \
958 /* The LOCAL_LABEL_PREFIX variable is used by dbxelf.h. */
961 #define LABEL_ALIGN(LABEL) \
962 s390_label_align ((LABEL))
964 /* How to refer to registers in assembler output. This sequence is
965 indexed by compiler's hard-register-number (see above). */
966 #define REGISTER_NAMES \
974 }
976 #define ADDITIONAL_REGISTER_NAMES \
982 /* Print operand X (an rtx) in assembler syntax to file FILE. */
983 #define PRINT_OPERAND(FILE, X, CODE) print_operand ((FILE), (X), (CODE))
984 #define PRINT_OPERAND_ADDRESS(FILE, ADDR) print_operand_address ((FILE), (ADDR))
986 /* Output an element of a case-vector that is absolute. */
987 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
988 do { \
989 char buf[32]; \
990 fputs (integer_asm_op (UNITS_PER_LONG, TRUE), (FILE)); \
992 assemble_name ((FILE), buf); \
994 } while (0)
996 /* Output an element of a case-vector that is relative. */
997 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
998 do { \
999 char buf[32]; \
1000 fputs (integer_asm_op (UNITS_PER_LONG, TRUE), (FILE)); \
1002 assemble_name ((FILE), buf); \
1005 assemble_name ((FILE), buf); \
1007 } while (0)
1009 /* Mark the return register as used by the epilogue so that we can
1010 use it in unadorned (return) and (simple_return) instructions. */
1011 #define EPILOGUE_USES(REGNO) ((REGNO) == RETURN_REGNUM)
1013 #undef ASM_OUTPUT_FUNCTION_LABEL
1014 #define ASM_OUTPUT_FUNCTION_LABEL(FILE, NAME, DECL) \
1015 s390_asm_output_function_label ((FILE), (NAME), (DECL))
1017 #if S390_USE_TARGET_ATTRIBUTE
1018 /* Hook to output .machine and .machinemode at start of function. */
1019 #undef ASM_OUTPUT_FUNCTION_PREFIX
1020 #define ASM_OUTPUT_FUNCTION_PREFIX s390_asm_output_function_prefix
1022 /* Hook to output .machine and .machinemode at end of function. */
1023 #undef ASM_DECLARE_FUNCTION_SIZE
1024 #define ASM_DECLARE_FUNCTION_SIZE s390_asm_declare_function_size
1025 #endif
1027 /* Miscellaneous parameters. */
1029 /* Specify the machine mode that this machine uses for the index in the
1030 tablejump instruction. */
1031 #define CASE_VECTOR_MODE (TARGET_64BIT ? DImode : SImode)
1033 /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
1034 is done just by pretending it is already truncated. */
1035 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1037 /* Specify the machine mode that pointers have.
1038 After generation of rtl, the compiler makes no further distinction
1039 between pointers and any other objects of this machine mode. */
1040 #define Pmode (TARGET_64BIT ? DImode : SImode)
1042 /* This is -1 for "pointer mode" extend. See ptr_extend in s390.md. */
1043 #define POINTERS_EXTEND_UNSIGNED -1
1045 /* A function address in a call instruction is a byte address (for
1046 indexing purposes) so give the MEM rtx a byte's mode. */
1047 #define FUNCTION_MODE QImode
1049 /* Specify the value which is used when clz operand is zero. */
1050 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 64, 1)
1052 /* Machine-specific symbol_ref flags. */
1053 #define SYMBOL_FLAG_ALIGN_SHIFT SYMBOL_FLAG_MACH_DEP_SHIFT
1054 #define SYMBOL_FLAG_ALIGN_MASK \
1055 ((SYMBOL_FLAG_MACH_DEP << 0) | (SYMBOL_FLAG_MACH_DEP << 1))
1057 #define SYMBOL_FLAG_SET_ALIGN(X, A) \
1058 (SYMBOL_REF_FLAGS (X) = (SYMBOL_REF_FLAGS (X) & ~SYMBOL_FLAG_ALIGN_MASK) \
1059 | (A << SYMBOL_FLAG_ALIGN_SHIFT))
1061 #define SYMBOL_FLAG_GET_ALIGN(X) \
1062 ((SYMBOL_REF_FLAGS (X) & SYMBOL_FLAG_ALIGN_MASK) >> SYMBOL_FLAG_ALIGN_SHIFT)
1064 /* Helpers to access symbol_ref flags. They are used in
1065 check_symref_alignment() and larl_operand to detect if the
1066 available alignment matches the required one. We do not use
1067 a positive check like _ALIGN2 because in that case we would have
1068 to annotate every symbol_ref. However, we only want to touch
1069 the symbol_refs that can be misaligned and assume that the others
1070 are correctly aligned. Hence, if a symbol_ref does not have
1071 a _NOTALIGN flag it is supposed to be correctly aligned. */
1072 #define SYMBOL_FLAG_SET_NOTALIGN2(X) SYMBOL_FLAG_SET_ALIGN((X), 1)
1073 #define SYMBOL_FLAG_SET_NOTALIGN4(X) SYMBOL_FLAG_SET_ALIGN((X), 2)
1074 #define SYMBOL_FLAG_SET_NOTALIGN8(X) SYMBOL_FLAG_SET_ALIGN((X), 3)
1076 #define SYMBOL_FLAG_NOTALIGN2_P(X) (SYMBOL_FLAG_GET_ALIGN(X) == 1)
1077 #define SYMBOL_FLAG_NOTALIGN4_P(X) (SYMBOL_FLAG_GET_ALIGN(X) == 2 \
1078 || SYMBOL_FLAG_GET_ALIGN(X) == 1)
1079 #define SYMBOL_FLAG_NOTALIGN8_P(X) (SYMBOL_FLAG_GET_ALIGN(X) == 3 \
1080 || SYMBOL_FLAG_GET_ALIGN(X) == 2 \
1081 || SYMBOL_FLAG_GET_ALIGN(X) == 1)
1083 /* Check whether integer displacement is in range for a short displacement. */
1084 #define SHORT_DISP_IN_RANGE(d) ((d) >= 0 && (d) <= 4095)
1086 /* Check whether integer displacement is in range. */
1087 #define DISP_IN_RANGE(d) \
1088 (TARGET_LONG_DISPLACEMENT \
1089 ? ((d) >= -524288 && (d) <= 524287) \
1090 : SHORT_DISP_IN_RANGE(d))
1092 /* Reads can reuse write prefetches, used by tree-ssa-prefetch-loops.c. */
1093 #define READ_CAN_USE_WRITE_PREFETCH 1
1097 /* The truth element value for vector comparisons. Our instructions
1098 always generate -1 in that case. */
1099 #define VECTOR_STORE_FLAG_VALUE(MODE) CONSTM1_RTX (GET_MODE_INNER (MODE))
1101 /* Target pragma. */
1103 /* resolve_overloaded_builtin can not be defined the normal way since
1104 it is defined in code which technically belongs to the
1105 front-end. */
1106 #define REGISTER_TARGET_PRAGMAS() \
1107 do { \
1108 s390_register_target_pragmas (); \
1109 } while (0)