1 /* Definitions of target machine for GNU compiler. VAX version.
2 Copyright (C) 1987, 1988, 1991, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to
19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
23 /* Target CPU builtins. */
24 #define TARGET_CPU_CPP_BUILTINS() \
27 builtin_define ("__vax__"); \
28 builtin_assert ("cpu=vax"); \
29 builtin_assert ("machine=vax"); \
32 builtin_define ("__GFLOAT"); \
33 builtin_define ("__GFLOAT__"); \
40 /* Use -J option for long branch support with Unix assembler. */
44 /* Choose proper libraries depending on float format.
45 Note that there are no profiling libraries for g-format.
46 Also use -lg for the sake of dbx. */
48 #define LIB_SPEC "%{g:-lg}\
49 %{mg:%{lm:-lmg} -lcg \
50 %{p:%eprofiling not supported with -mg\n}\
51 %{pg:%eprofiling not supported with -mg\n}}\
52 %{!mg:%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}}"
54 /* Print subsidiary information on the compiler version in use. */
56 #ifndef TARGET_NAME /* A more specific value might be supplied via -D. */
57 #define TARGET_NAME "vax"
59 #define TARGET_VERSION fprintf (stderr, " (%s)", TARGET_NAME)
61 /* Run-time compilation parameters selecting different hardware subsets. */
63 /* Nonzero if ELF. Redefined by vax/elf.h. */
66 /* Default target_flags if no switches specified. */
68 #ifndef TARGET_DEFAULT
69 #define TARGET_DEFAULT (MASK_UNIX_ASM)
72 #define OVERRIDE_OPTIONS override_options ()
75 /* Target machine storage layout */
77 /* Define this if most significant bit is lowest numbered
78 in instructions that operate on numbered bit-fields.
79 This is not true on the VAX. */
80 #define BITS_BIG_ENDIAN 0
82 /* Define this if most significant byte of a word is the lowest numbered. */
83 /* That is not true on the VAX. */
84 #define BYTES_BIG_ENDIAN 0
86 /* Define this if most significant word of a multiword number is the lowest
88 /* This is not true on the VAX. */
89 #define WORDS_BIG_ENDIAN 0
91 /* Width of a word, in units (bytes). */
92 #define UNITS_PER_WORD 4
94 /* Allocation boundary (in *bits*) for storing arguments in argument list. */
95 #define PARM_BOUNDARY 32
97 /* Allocation boundary (in *bits*) for the code of a function. */
98 #define FUNCTION_BOUNDARY 16
100 /* Alignment of field after `int : 0' in a structure. */
101 #define EMPTY_FIELD_BOUNDARY (TARGET_VAXC_ALIGNMENT ? 8 : 32)
103 /* Every structure's size must be a multiple of this. */
104 #define STRUCTURE_SIZE_BOUNDARY 8
106 /* A bit-field declared as `int' forces `int' alignment for the struct. */
107 #define PCC_BITFIELD_TYPE_MATTERS (!TARGET_VAXC_ALIGNMENT)
109 /* No data type wants to be aligned rounder than this. */
110 #define BIGGEST_ALIGNMENT 32
112 /* No structure field wants to be aligned rounder than this. */
113 #define BIGGEST_FIELD_ALIGNMENT (TARGET_VAXC_ALIGNMENT ? 8 : 32)
115 /* Set this nonzero if move instructions will actually fail to work
116 when given unaligned data. */
117 #define STRICT_ALIGNMENT 0
119 /* Let's keep the stack somewhat aligned. */
120 #define STACK_BOUNDARY 32
122 /* The table of an ADDR_DIFF_VEC must be contiguous with the case
123 opcode, it is part of the case instruction. */
124 #define ADDR_VEC_ALIGN(ADDR_VEC) 0
126 /* Standard register usage. */
128 /* Number of actual hardware registers.
129 The hardware registers are assigned numbers for the compiler
130 from 0 to just below FIRST_PSEUDO_REGISTER.
131 All registers that the compiler knows about must be given numbers,
132 even those that are not normally considered general registers. */
133 #define FIRST_PSEUDO_REGISTER 16
135 /* 1 for registers that have pervasive standard uses
136 and are not available for the register allocator.
137 On the VAX, these are the AP, FP, SP and PC. */
138 #define FIXED_REGISTERS {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1}
140 /* 1 for registers not available across function calls.
141 These must include the FIXED_REGISTERS and also any
142 registers that can be used without being saved.
143 The latter must include the registers where values are returned
144 and the register where structure-value addresses are passed.
145 Aside from that, you can include as many other registers as you like. */
146 #define CALL_USED_REGISTERS {1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1}
148 /* Return number of consecutive hard regs needed starting at reg REGNO
149 to hold something of mode MODE.
150 This is ordinarily the length in words of a value of mode MODE
151 but can be less for certain modes in special long registers.
152 On the VAX, all registers are one word long. */
153 #define HARD_REGNO_NREGS(REGNO, MODE) \
154 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
156 /* Value is 1 if hard register REGNO can hold a value of machine-mode MODE.
157 On the VAX, all registers can hold all modes. */
158 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
160 /* Value is 1 if it is a good idea to tie two pseudo registers
161 when one has mode MODE1 and one has mode MODE2.
162 If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
163 for any hard reg, then this must be 0 for correct output. */
164 #define MODES_TIEABLE_P(MODE1, MODE2) 1
166 /* Specify the registers used for certain standard purposes.
167 The values of these macros are register numbers. */
169 /* VAX pc is overloaded on a register. */
170 #define PC_REGNUM VAX_PC_REGNUM
172 /* Register to use for pushing function arguments. */
173 #define STACK_POINTER_REGNUM VAX_SP_REGNUM
175 /* Base register for access to local variables of the function. */
176 #define FRAME_POINTER_REGNUM VAX_FP_REGNUM
178 /* Value should be nonzero if functions must have frame pointers.
179 Zero means the frame pointer need not be set up (and parms
180 may be accessed via the stack pointer) in functions that seem suitable.
181 This is computed in `reload', in reload1.c. */
182 #define FRAME_POINTER_REQUIRED 1
184 /* Base register for access to arguments of the function. */
185 #define ARG_POINTER_REGNUM VAX_AP_REGNUM
187 /* Register in which static-chain is passed to a function. */
188 #define STATIC_CHAIN_REGNUM 0
190 /* Register in which address to store a structure value
191 is passed to a function. */
192 #define VAX_STRUCT_VALUE_REGNUM 1
194 /* Define the classes of registers for register constraints in the
195 machine description. Also define ranges of constants.
197 One of the classes must always be named ALL_REGS and include all hard regs.
198 If there is more than one class, another class must be named NO_REGS
199 and contain no registers.
201 The name GENERAL_REGS must be the name of a class (or an alias for
202 another name such as ALL_REGS). This is the class of registers
203 that is allowed by "g" or "r" in a register constraint.
204 Also, registers outside this class are allocated only when
205 instructions express preferences for them.
207 The classes must be numbered in nondecreasing order; that is,
208 a larger-numbered class must never be contained completely
209 in a smaller-numbered class.
211 For any two classes, it is very desirable that there be another
212 class that represents their union. */
214 /* The VAX has only one kind of registers, so NO_REGS and ALL_REGS
215 are the only classes. */
217 enum reg_class
{ NO_REGS
, ALL_REGS
, LIM_REG_CLASSES
};
219 #define N_REG_CLASSES (int) LIM_REG_CLASSES
221 /* Since GENERAL_REGS is the same class as ALL_REGS,
222 don't give it a different class number; just make it an alias. */
224 #define GENERAL_REGS ALL_REGS
226 /* Give names of register classes as strings for dump file. */
228 #define REG_CLASS_NAMES \
229 { "NO_REGS", "ALL_REGS" }
231 /* Define which registers fit in which classes.
232 This is an initializer for a vector of HARD_REG_SET
233 of length N_REG_CLASSES. */
235 #define REG_CLASS_CONTENTS {{0}, {0xffff}}
237 /* The same information, inverted:
238 Return the class number of the smallest class containing
239 reg number REGNO. This could be a conditional expression
240 or could index an array. */
242 #define REGNO_REG_CLASS(REGNO) ALL_REGS
244 /* The class value for index registers, and the one for base regs. */
246 #define INDEX_REG_CLASS ALL_REGS
247 #define BASE_REG_CLASS ALL_REGS
249 /* Get reg_class from a letter such as appears in the machine description. */
251 #define REG_CLASS_FROM_LETTER(C) NO_REGS
253 /* The letters I, J, K, L, M, N, and O in a register constraint string
254 can be used to stand for particular ranges of immediate operands.
255 This macro defines what the ranges are.
256 C is the letter, and VALUE is a constant value.
257 Return 1 if VALUE is in the range specified by C.
259 `I' is the constant zero.
260 `J' is a value between 0 .. 63 (inclusive)
261 `K' is a value between -128 and 127 (inclusive)
262 'L' is a value between -32768 and 32767 (inclusive)
263 `M' is a value between 0 and 255 (inclusive)
264 'N' is a value between 0 and 65535 (inclusive)
265 `O' is a value between -63 and -1 (inclusive) */
267 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
268 ( (C) == 'I' ? (VALUE) == 0 \
269 : (C) == 'J' ? 0 <= (VALUE) && (VALUE) < 64 \
270 : (C) == 'O' ? -63 <= (VALUE) && (VALUE) < 0 \
271 : (C) == 'K' ? -128 <= (VALUE) && (VALUE) < 128 \
272 : (C) == 'M' ? 0 <= (VALUE) && (VALUE) < 256 \
273 : (C) == 'L' ? -32768 <= (VALUE) && (VALUE) < 32768 \
274 : (C) == 'N' ? 0 <= (VALUE) && (VALUE) < 65536 \
277 /* Similar, but for floating constants, and defining letters G and H.
278 Here VALUE is the CONST_DOUBLE rtx itself.
280 `G' is a floating-point zero. */
282 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) \
283 ((C) == 'G' ? ((VALUE) == CONST0_RTX (DFmode) \
284 || (VALUE) == CONST0_RTX (SFmode)) \
287 /* Optional extra constraints for this machine.
289 For the VAX, `Q' means that OP is a MEM that does not have a mode-dependent
292 #define EXTRA_CONSTRAINT(OP, C) \
294 ? MEM_P (OP) && !mode_dependent_address_p (XEXP (OP, 0)) \
297 /* Given an rtx X being reloaded into a reg required to be
298 in class CLASS, return the class of reg to actually use.
299 In general this is just CLASS; but on some machines
300 in some cases it is preferable to use a more restrictive class. */
302 #define PREFERRED_RELOAD_CLASS(X,CLASS) (CLASS)
304 /* Return the maximum number of consecutive registers
305 needed to represent mode MODE in a register of class CLASS. */
306 /* On the VAX, this is always the size of MODE in words,
307 since all registers are the same size. */
308 #define CLASS_MAX_NREGS(CLASS, MODE) \
309 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
311 /* Stack layout; function entry, exit and calling. */
313 /* Define this if pushing a word on the stack
314 makes the stack pointer a smaller address. */
315 #define STACK_GROWS_DOWNWARD
317 /* Define this to nonzero if the nominal address of the stack frame
318 is at the high-address end of the local variables;
319 that is, each additional local variable allocated
320 goes at a more negative offset in the frame. */
321 #define FRAME_GROWS_DOWNWARD 1
323 /* Offset within stack frame to start allocating local variables at.
324 If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
325 first local allocated. Otherwise, it is the offset to the BEGINNING
326 of the first local allocated. */
327 #define STARTING_FRAME_OFFSET 0
329 /* Given an rtx for the address of a frame,
330 return an rtx for the address of the word in the frame
331 that holds the dynamic chain--the previous frame's address. */
332 #define DYNAMIC_CHAIN_ADDRESS(FRAME) plus_constant ((FRAME), 12)
334 /* If we generate an insn to push BYTES bytes,
335 this says how many the stack pointer really advances by.
336 On the VAX, -(sp) pushes only the bytes of the operands. */
337 #define PUSH_ROUNDING(BYTES) (BYTES)
339 /* Offset of first parameter from the argument pointer register value. */
340 #define FIRST_PARM_OFFSET(FNDECL) 4
342 /* Value is the number of bytes of arguments automatically
343 popped when returning from a subroutine call.
344 FUNDECL is the declaration node of the function (as a tree),
345 FUNTYPE is the data type of the function (as a tree),
346 or for a library call it is an identifier node for the subroutine name.
347 SIZE is the number of bytes of arguments passed on the stack.
349 On the VAX, the RET insn pops a maximum of 255 args for any function. */
351 #define RETURN_POPS_ARGS(FUNDECL,FUNTYPE,SIZE) \
352 ((SIZE) > 255 * 4 ? 0 : (SIZE))
354 /* Define how to find the value returned by a function.
355 VALTYPE is the data type of the value (as a tree).
356 If the precise function being called is known, FUNC is its FUNCTION_DECL;
357 otherwise, FUNC is 0. */
359 /* On the VAX the return value is in R0 regardless. */
361 #define FUNCTION_VALUE(VALTYPE, FUNC) \
362 gen_rtx_REG (TYPE_MODE (VALTYPE), 0)
364 /* Define how to find the value returned by a library function
365 assuming the value has mode MODE. */
367 /* On the VAX the return value is in R0 regardless. */
369 #define LIBCALL_VALUE(MODE) gen_rtx_REG (MODE, 0)
371 /* Define this if PCC uses the nonreentrant convention for returning
372 structure and union values. */
374 #define PCC_STATIC_STRUCT_RETURN
376 /* 1 if N is a possible register number for a function value.
377 On the VAX, R0 is the only register thus used. */
379 #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0)
381 /* 1 if N is a possible register number for function argument passing.
382 On the VAX, no registers are used in this way. */
384 #define FUNCTION_ARG_REGNO_P(N) 0
386 /* Define a data type for recording info about an argument list
387 during the scan of that argument list. This data type should
388 hold all necessary information about the function itself
389 and about the args processed so far, enough to enable macros
390 such as FUNCTION_ARG to determine where the next arg should go.
392 On the VAX, this is a single integer, which is a number of bytes
393 of arguments scanned so far. */
395 #define CUMULATIVE_ARGS int
397 /* Initialize a variable CUM of type CUMULATIVE_ARGS
398 for a call to a function whose data type is FNTYPE.
399 For a library call, FNTYPE is 0.
401 On the VAX, the offset starts at 0. */
403 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
406 /* Update the data in CUM to advance over an argument
407 of mode MODE and data type TYPE.
408 (TYPE is null for libcalls where that information may not be available.) */
410 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
411 ((CUM) += ((MODE) != BLKmode \
412 ? (GET_MODE_SIZE (MODE) + 3) & ~3 \
413 : (int_size_in_bytes (TYPE) + 3) & ~3))
415 /* Define where to put the arguments to a function.
416 Value is zero to push the argument on the stack,
417 or a hard register in which to store the argument.
419 MODE is the argument's machine mode.
420 TYPE is the data type of the argument (as a tree).
421 This is null for libcalls where that information may
423 CUM is a variable of type CUMULATIVE_ARGS which gives info about
424 the preceding args and about the function being called.
425 NAMED is nonzero if this argument is a named parameter
426 (otherwise it is an extra parameter matching an ellipsis). */
428 /* On the VAX all args are pushed. */
430 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) 0
432 /* Output assembler code to FILE to increment profiler label # LABELNO
433 for profiling a function entry. */
435 #define VAX_FUNCTION_PROFILER_NAME "mcount"
436 #define FUNCTION_PROFILER(FILE, LABELNO) \
440 ASM_GENERATE_INTERNAL_LABEL (label, "LP", (LABELNO)); \
441 fprintf (FILE, "\tmovab "); \
442 assemble_name (FILE, label); \
443 asm_fprintf (FILE, ",%Rr0\n\tjsb %s\n", \
444 VAX_FUNCTION_PROFILER_NAME); \
448 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
449 the stack pointer does not matter. The value is tested only in
450 functions that have frame pointers.
451 No definition is equivalent to always zero. */
453 #define EXIT_IGNORE_STACK 1
455 /* Store in the variable DEPTH the initial difference between the
456 frame pointer reg contents and the stack pointer reg contents,
457 as of the start of the function body. This depends on the layout
458 of the fixed parts of the stack frame and on how registers are saved.
460 On the VAX, FRAME_POINTER_REQUIRED is always 1, so the definition of this
461 macro doesn't matter. But it must be defined. */
463 #define INITIAL_FRAME_POINTER_OFFSET(DEPTH) (DEPTH) = 0;
465 /* Output assembler code for a block containing the constant parts
466 of a trampoline, leaving space for the variable parts. */
468 /* On the VAX, the trampoline contains an entry mask and two instructions:
470 movl $STATIC,r0 (store the functions static chain)
471 jmp *$FUNCTION (jump to function code at address FUNCTION) */
473 #define TRAMPOLINE_TEMPLATE(FILE) \
475 assemble_aligned_integer (2, const0_rtx); \
476 assemble_aligned_integer (2, GEN_INT (0x8fd0)); \
477 assemble_aligned_integer (4, const0_rtx); \
478 assemble_aligned_integer (1, GEN_INT (0x50 + STATIC_CHAIN_REGNUM)); \
479 assemble_aligned_integer (2, GEN_INT (0x9f17)); \
480 assemble_aligned_integer (4, const0_rtx); \
483 /* Length in units of the trampoline for entering a nested function. */
485 #define TRAMPOLINE_SIZE 15
487 /* Emit RTL insns to initialize the variable parts of a trampoline.
488 FNADDR is an RTX for the address of the function's pure code.
489 CXT is an RTX for the static chain value for the function. */
491 /* We copy the register-mask from the function's pure code
492 to the start of the trampoline. */
493 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
495 emit_move_insn (gen_rtx_MEM (HImode, TRAMP), \
496 gen_rtx_MEM (HImode, FNADDR)); \
497 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 4)), CXT); \
498 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 11)), \
499 plus_constant (FNADDR, 2)); \
500 emit_insn (gen_sync_istream ()); \
503 /* Byte offset of return address in a stack frame. The "saved PC" field
504 is in element [4] when treating the frame as an array of longwords. */
506 #define RETURN_ADDRESS_OFFSET (4 * UNITS_PER_WORD) /* 16 */
508 /* A C expression whose value is RTL representing the value of the return
509 address for the frame COUNT steps up from the current frame.
510 FRAMEADDR is already the frame pointer of the COUNT frame, so we
513 #define RETURN_ADDR_RTX(COUNT, FRAME) \
515 ? gen_rtx_MEM (Pmode, plus_constant (FRAME, RETURN_ADDRESS_OFFSET)) \
519 /* Addressing modes, and classification of registers for them. */
521 #define HAVE_POST_INCREMENT 1
523 #define HAVE_PRE_DECREMENT 1
525 /* Macros to check register numbers against specific register classes. */
527 /* These assume that REGNO is a hard or pseudo reg number.
528 They give nonzero only if REGNO is a hard reg of the suitable class
529 or a pseudo reg currently allocated to a suitable hard reg.
530 Since they use reg_renumber, they are safe only once reg_renumber
531 has been allocated, which happens in local-alloc.c. */
533 #define REGNO_OK_FOR_INDEX_P(regno) \
534 ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0)
535 #define REGNO_OK_FOR_BASE_P(regno) \
536 ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0)
538 /* Maximum number of registers that can appear in a valid memory address. */
540 #define MAX_REGS_PER_ADDRESS 2
542 /* 1 if X is an rtx for a constant that is a valid address. */
544 #define CONSTANT_ADDRESS_P(X) legitimate_constant_address_p (X)
546 /* Nonzero if the constant value X is a legitimate general operand.
547 It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE. */
549 #define LEGITIMATE_CONSTANT_P(X) legitimate_constant_p (X)
551 /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
552 and check its validity for a certain class.
553 We have two alternate definitions for each of them.
554 The usual definition accepts all pseudo regs; the other rejects
555 them unless they have been allocated suitable hard regs.
556 The symbol REG_OK_STRICT causes the latter definition to be used.
558 Most source files want to accept pseudo regs in the hope that
559 they will get allocated to the class that the insn wants them to be in.
560 Source files for reload pass need to be strict.
561 After reload, it makes no difference, since pseudo regs have
562 been eliminated by then. */
564 #ifndef REG_OK_STRICT
566 /* Nonzero if X is a hard reg that can be used as an index
567 or if it is a pseudo reg. */
568 #define REG_OK_FOR_INDEX_P(X) 1
570 /* Nonzero if X is a hard reg that can be used as a base reg
571 or if it is a pseudo reg. */
572 #define REG_OK_FOR_BASE_P(X) 1
574 /* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression
575 that is a valid memory address for an instruction. */
576 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR) \
577 { if (legitimate_address_p ((MODE), (X), 0)) goto ADDR; }
581 /* Nonzero if X is a hard reg that can be used as an index. */
582 #define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
584 /* Nonzero if X is a hard reg that can be used as a base reg. */
585 #define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
587 /* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression
588 that is a valid memory address for an instruction. */
589 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR) \
590 { if (legitimate_address_p ((MODE), (X), 1)) goto ADDR; }
594 /* Go to LABEL if ADDR (a legitimate address expression)
595 has an effect that depends on the machine mode it is used for. */
596 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL) \
597 { if (vax_mode_dependent_address_p (ADDR)) goto LABEL; }
599 /* Specify the machine mode that this machine uses
600 for the index in the tablejump instruction. */
601 #define CASE_VECTOR_MODE HImode
603 /* Define as C expression which evaluates to nonzero if the tablejump
604 instruction expects the table to contain offsets from the address of the
606 Do not define this if the table should contain absolute addresses. */
607 #define CASE_VECTOR_PC_RELATIVE 1
609 /* Indicate that jump tables go in the text section. This is
610 necessary when compiling PIC code. */
611 #define JUMP_TABLES_IN_TEXT_SECTION 1
613 /* Define this as 1 if `char' should by default be signed; else as 0. */
614 #define DEFAULT_SIGNED_CHAR 1
616 /* This flag, if defined, says the same insns that convert to a signed fixnum
617 also convert validly to an unsigned one. */
618 #define FIXUNS_TRUNC_LIKE_FIX_TRUNC
620 /* Max number of bytes we can move from memory to memory
621 in one reasonably fast instruction. */
624 /* Nonzero if access to memory by bytes is slow and undesirable. */
625 #define SLOW_BYTE_ACCESS 0
627 /* Define if shifts truncate the shift count
628 which implies one can omit a sign-extension or zero-extension
630 /* #define SHIFT_COUNT_TRUNCATED */
632 /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
633 is done just by pretending it is already truncated. */
634 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
636 /* Specify the machine mode that pointers have.
637 After generation of rtl, the compiler makes no further distinction
638 between pointers and any other objects of this machine mode. */
641 /* A function address in a call instruction
642 is a byte address (for indexing purposes)
643 so give the MEM rtx a byte's mode. */
644 #define FUNCTION_MODE QImode
646 /* This machine doesn't use IEEE floats. */
648 #define TARGET_FLOAT_FORMAT VAX_FLOAT_FORMAT
650 /* Specify the cost of a branch insn; roughly the number of extra insns that
651 should be added to avoid a branch.
653 Branches are extremely cheap on the VAX while the shift insns often
654 used to replace branches can be expensive. */
656 #define BRANCH_COST 0
658 /* Tell final.c how to eliminate redundant test instructions. */
660 /* Here we define machine-dependent flags and fields in cc_status
661 (see `conditions.h'). No extra ones are needed for the VAX. */
663 /* Store in cc_status the expressions
664 that the condition codes will describe
665 after execution of an instruction whose pattern is EXP.
666 Do not alter them if the instruction would not alter the cc's. */
668 #define NOTICE_UPDATE_CC(EXP, INSN) \
669 vax_notice_update_cc ((EXP), (INSN))
671 #define OUTPUT_JUMP(NORMAL, FLOAT, NO_OV) \
672 { if (cc_status.flags & CC_NO_OVERFLOW) \
677 /* Control the assembler format that we output. */
679 /* A C string constant describing how to begin a comment in the target
680 assembler language. The compiler assumes that the comment will end at
681 the end of the line. */
683 #define ASM_COMMENT_START "#"
685 /* Output to assembler file text saying following lines
686 may contain character constants, extra white space, comments, etc. */
688 #define ASM_APP_ON "#APP\n"
690 /* Output to assembler file text saying following lines
691 no longer contain unusual constructs. */
693 #define ASM_APP_OFF "#NO_APP\n"
695 /* Output before read-only data. */
697 #define TEXT_SECTION_ASM_OP "\t.text"
699 /* Output before writable data. */
701 #define DATA_SECTION_ASM_OP "\t.data"
703 /* How to refer to registers in assembler output.
704 This sequence is indexed by compiler's hard-register-number (see above).
705 The register names will be prefixed by REGISTER_PREFIX, if any. */
707 #define REGISTER_PREFIX ""
708 #define REGISTER_NAMES \
709 { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
710 "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", }
712 /* This is BSD, so it wants DBX format. */
714 #define DBX_DEBUGGING_INFO 1
716 /* Do not break .stabs pseudos into continuations. */
718 #define DBX_CONTIN_LENGTH 0
720 /* This is the char to use for continuation (in case we need to turn
721 continuation back on). */
723 #define DBX_CONTIN_CHAR '?'
725 /* Don't use the `xsfoo;' construct in DBX output; this system
726 doesn't support it. */
730 /* Output the .stabs for a C `static' variable in the data section. */
731 #define DBX_STATIC_STAB_DATA_SECTION
733 /* VAX specific: which type character is used for type double? */
735 #define ASM_DOUBLE_CHAR (TARGET_G_FLOAT ? 'g' : 'd')
737 /* This is how to output a command to make the user-level label named NAME
738 defined for reference from other files. */
740 /* Globalizing directive for a label. */
741 #define GLOBAL_ASM_OP ".globl "
743 /* The prefix to add to user-visible assembler symbols. */
745 #define USER_LABEL_PREFIX "_"
747 /* This is how to store into the string LABEL
748 the symbol_ref name of an internal numbered label where
749 PREFIX is the class of label and NUM is the number within the class.
750 This is suitable for output with `assemble_name'. */
752 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
753 sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
755 /* This is how to output an insn to push a register on the stack.
756 It need not be very fast code. */
758 #define ASM_OUTPUT_REG_PUSH(FILE,REGNO) \
759 fprintf (FILE, "\tpushl %s\n", reg_names[REGNO])
761 /* This is how to output an insn to pop a register from the stack.
762 It need not be very fast code. */
764 #define ASM_OUTPUT_REG_POP(FILE,REGNO) \
765 fprintf (FILE, "\tmovl (%s)+,%s\n", reg_names[STACK_POINTER_REGNUM], \
768 /* This is how to output an element of a case-vector that is absolute.
769 (The VAX does not use such vectors,
770 but we must define this macro anyway.) */
772 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
776 ASM_GENERATE_INTERNAL_LABEL (label, "L", (VALUE));\
777 fprintf (FILE, "\t.long "); \
778 assemble_name (FILE, label); \
779 fprintf (FILE, "\n"); \
783 /* This is how to output an element of a case-vector that is relative. */
785 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
789 ASM_GENERATE_INTERNAL_LABEL (label, "L", (VALUE)); \
790 fprintf (FILE, "\t.word "); \
791 assemble_name (FILE, label); \
792 ASM_GENERATE_INTERNAL_LABEL (label, "L", (REL)); \
793 fprintf (FILE, "-"); \
794 assemble_name (FILE, label); \
795 fprintf (FILE, "\n"); \
799 /* This is how to output an assembler line
800 that says to advance the location counter
801 to a multiple of 2**LOG bytes. */
803 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
804 fprintf (FILE, "\t.align %d\n", (LOG))
806 /* This is how to output an assembler line
807 that says to advance the location counter by SIZE bytes. */
809 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
810 fprintf (FILE, "\t.space %u\n", (int)(SIZE))
812 /* This says how to output an assembler line
813 to define a global common symbol. */
815 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
816 ( fputs (".comm ", (FILE)), \
817 assemble_name ((FILE), (NAME)), \
818 fprintf ((FILE), ",%u\n", (int)(ROUNDED)))
820 /* This says how to output an assembler line
821 to define a local common symbol. */
823 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
824 ( fputs (".lcomm ", (FILE)), \
825 assemble_name ((FILE), (NAME)), \
826 fprintf ((FILE), ",%u\n", (int)(ROUNDED)))
828 /* Store in OUTPUT a string (made with alloca) containing
829 an assembler-name for a local static variable named NAME.
830 LABELNO is an integer which is different for each call. */
832 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
833 ( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 10), \
834 sprintf ((OUTPUT), "%s.%d", (NAME), (LABELNO)))
836 /* Print an instruction operand X on file FILE.
837 CODE is the code from the %-spec that requested printing this operand;
838 if `%z3' was used to print operand 3, then CODE is 'z'.
840 VAX operand formatting codes:
843 C reverse branch condition
844 D 64-bit immediate operand
845 B the low 8 bits of the complement of a constant operand
846 H the low 16 bits of the complement of a constant operand
847 M a mask for the N highest bits of a word
848 N the complement of a constant integer operand
849 P constant operand plus 1
850 R 32 - constant operand
851 b the low 8 bits of a negated constant operand
852 h the low 16 bits of a negated constant operand
853 # 'd' or 'g' depending on whether dfloat or gfloat is used
856 /* The purpose of D is to get around a quirk or bug in VAX assembler
857 whereby -1 in a 64-bit immediate operand means 0x00000000ffffffff,
858 which is not a 64-bit minus one. As a workaround, we output negative
860 #if HOST_BITS_PER_WIDE_INT == 64
861 # define NEG_HWI_PRINT_HEX16 HOST_WIDE_INT_PRINT_HEX
863 # define NEG_HWI_PRINT_HEX16 "0xffffffff%08lx"
866 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
867 ((CODE) == '#' || (CODE) == '|')
869 #define PRINT_OPERAND(FILE, X, CODE) \
870 { if (CODE == '#') fputc (ASM_DOUBLE_CHAR, FILE); \
871 else if (CODE == '|') \
872 fputs (REGISTER_PREFIX, FILE); \
873 else if (CODE == 'C') \
874 fputs (rev_cond_name (X), FILE); \
875 else if (CODE == 'D' && CONST_INT_P (X) && INTVAL (X) < 0) \
876 fprintf (FILE, "$" NEG_HWI_PRINT_HEX16, INTVAL (X)); \
877 else if (CODE == 'P' && CONST_INT_P (X)) \
878 fprintf (FILE, "$" HOST_WIDE_INT_PRINT_DEC, INTVAL (X) + 1); \
879 else if (CODE == 'N' && CONST_INT_P (X)) \
880 fprintf (FILE, "$" HOST_WIDE_INT_PRINT_DEC, ~ INTVAL (X)); \
881 /* rotl instruction cannot deal with negative arguments. */ \
882 else if (CODE == 'R' && CONST_INT_P (X)) \
883 fprintf (FILE, "$" HOST_WIDE_INT_PRINT_DEC, 32 - INTVAL (X)); \
884 else if (CODE == 'H' && CONST_INT_P (X)) \
885 fprintf (FILE, "$%d", (int) (0xffff & ~ INTVAL (X))); \
886 else if (CODE == 'h' && CONST_INT_P (X)) \
887 fprintf (FILE, "$%d", (short) - INTVAL (x)); \
888 else if (CODE == 'B' && CONST_INT_P (X)) \
889 fprintf (FILE, "$%d", (int) (0xff & ~ INTVAL (X))); \
890 else if (CODE == 'b' && CONST_INT_P (X)) \
891 fprintf (FILE, "$%d", (int) (0xff & - INTVAL (X))); \
892 else if (CODE == 'M' && CONST_INT_P (X)) \
893 fprintf (FILE, "$%d", ~((1 << INTVAL (x)) - 1)); \
894 else if (REG_P (X)) \
895 fprintf (FILE, "%s", reg_names[REGNO (X)]); \
896 else if (MEM_P (X)) \
897 output_address (XEXP (X, 0)); \
898 else if (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) == SFmode) \
900 real_to_decimal (dstr, CONST_DOUBLE_REAL_VALUE (X), \
901 sizeof (dstr), 0, 1); \
902 fprintf (FILE, "$0f%s", dstr); } \
903 else if (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) == DFmode) \
905 real_to_decimal (dstr, CONST_DOUBLE_REAL_VALUE (X), \
906 sizeof (dstr), 0, 1); \
907 fprintf (FILE, "$0%c%s", ASM_DOUBLE_CHAR, dstr); } \
908 else { putc ('$', FILE); output_addr_const (FILE, X); }}
910 /* Print a memory operand whose address is X, on file FILE.
911 This uses a function in output-vax.c. */
913 #define PRINT_OPERAND_ADDRESS(FILE, ADDR) \
914 print_operand_address (FILE, ADDR)
916 /* This is a blatent lie. However, it's good enough, since we don't
917 actually have any code whatsoever for which this isn't overridden
918 by the proper FDE definition. */
919 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, PC_REGNUM)