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1 282 jeremybenn
/* 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, 2007, 2008, 2009
4
   Free Software Foundation, Inc.
5
 
6
This file is part of GCC.
7
 
8
GCC is free software; you can redistribute it and/or modify
9
it under the terms of the GNU General Public License as published by
10
the Free Software Foundation; either version 3, or (at your option)
11
any later version.
12
 
13
GCC is distributed in the hope that it will be useful,
14
but WITHOUT ANY WARRANTY; without even the implied warranty of
15
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
GNU General Public License for more details.
17
 
18
You should have received a copy of the GNU General Public License
19
along with GCC; see the file COPYING3.  If not see
20
<http://www.gnu.org/licenses/>.  */
21
 
22
 
23
/* Target CPU builtins.  */
24
#define TARGET_CPU_CPP_BUILTINS()               \
25
  do                                            \
26
    {                                           \
27
      builtin_define ("__vax__");               \
28
      builtin_assert ("cpu=vax");               \
29
      builtin_assert ("machine=vax");           \
30
      if (TARGET_G_FLOAT)                       \
31
        {                                       \
32
          builtin_define ("__GFLOAT");          \
33
          builtin_define ("__GFLOAT__");        \
34
        }                                       \
35
    }                                           \
36
  while (0)
37
 
38
#define VMS_TARGET 0
39
 
40
/* Use -J option for long branch support with Unix assembler.  */
41
 
42
#define ASM_SPEC "-J"
43
 
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.  */
47
 
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}}"
53
 
54
/* Print subsidiary information on the compiler version in use.  */
55
 
56
#ifndef TARGET_NAME     /* A more specific value might be supplied via -D.  */
57
#define TARGET_NAME "vax"
58
#endif
59
#define TARGET_VERSION fprintf (stderr, " (%s)", TARGET_NAME)
60
 
61
/* Run-time compilation parameters selecting different hardware subsets.  */
62
 
63
/* Nonzero if ELF.  Redefined by vax/elf.h.  */
64
#define TARGET_ELF 0
65
 
66
/* Use BSD names for udiv and umod libgcc calls.  */
67
#define TARGET_BSD_DIVMOD 1
68
 
69
/* Default target_flags if no switches specified.  */
70
 
71
#ifndef TARGET_DEFAULT
72
#define TARGET_DEFAULT (MASK_UNIX_ASM)
73
#endif
74
 
75
#define OVERRIDE_OPTIONS override_options ()
76
 
77
 
78
/* Target machine storage layout */
79
 
80
/* Define this if most significant bit is lowest numbered
81
   in instructions that operate on numbered bit-fields.
82
   This is not true on the VAX.  */
83
#define BITS_BIG_ENDIAN 0
84
 
85
/* Define this if most significant byte of a word is the lowest numbered.  */
86
/* That is not true on the VAX.  */
87
#define BYTES_BIG_ENDIAN 0
88
 
89
/* Define this if most significant word of a multiword number is the lowest
90
   numbered.  */
91
/* This is not true on the VAX.  */
92
#define WORDS_BIG_ENDIAN 0
93
 
94
/* Width of a word, in units (bytes).  */
95
#define UNITS_PER_WORD 4
96
 
97
/* Allocation boundary (in *bits*) for storing arguments in argument list.  */
98
#define PARM_BOUNDARY 32
99
 
100
/* Allocation boundary (in *bits*) for the code of a function.  */
101
#define FUNCTION_BOUNDARY 16
102
 
103
/* Alignment of field after `int : 0' in a structure.  */
104
#define EMPTY_FIELD_BOUNDARY (TARGET_VAXC_ALIGNMENT ? 8 : 32)
105
 
106
/* Every structure's size must be a multiple of this.  */
107
#define STRUCTURE_SIZE_BOUNDARY 8
108
 
109
/* A bit-field declared as `int' forces `int' alignment for the struct.  */
110
#define PCC_BITFIELD_TYPE_MATTERS (! TARGET_VAXC_ALIGNMENT)
111
 
112
/* No data type wants to be aligned rounder than this.  */
113
#define BIGGEST_ALIGNMENT 32
114
 
115
/* No structure field wants to be aligned rounder than this.  */
116
#define BIGGEST_FIELD_ALIGNMENT (TARGET_VAXC_ALIGNMENT ? 8 : 32)
117
 
118
/* Set this nonzero if move instructions will actually fail to work
119
   when given unaligned data.  */
120
#define STRICT_ALIGNMENT 0
121
 
122
/* Let's keep the stack somewhat aligned.  */
123
#define STACK_BOUNDARY 32
124
 
125
/* The table of an ADDR_DIFF_VEC must be contiguous with the case
126
   opcode, it is part of the case instruction.  */
127
#define ADDR_VEC_ALIGN(ADDR_VEC) 0
128
 
129
/* Standard register usage.  */
130
 
131
/* Number of actual hardware registers.
132
   The hardware registers are assigned numbers for the compiler
133
   from 0 to just below FIRST_PSEUDO_REGISTER.
134
   All registers that the compiler knows about must be given numbers,
135
   even those that are not normally considered general registers.  */
136
#define FIRST_PSEUDO_REGISTER 16
137
 
138
/* 1 for registers that have pervasive standard uses
139
   and are not available for the register allocator.
140
   On the VAX, these are the AP, FP, SP and PC.  */
141
#define FIXED_REGISTERS {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1}
142
 
143
/* 1 for registers not available across function calls.
144
   These must include the FIXED_REGISTERS and also any
145
   registers that can be used without being saved.
146
   The latter must include the registers where values are returned
147
   and the register where structure-value addresses are passed.
148
   Aside from that, you can include as many other registers as you like.  */
149
#define CALL_USED_REGISTERS {1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1}
150
 
151
/* Return number of consecutive hard regs needed starting at reg REGNO
152
   to hold something of mode MODE.
153
   This is ordinarily the length in words of a value of mode MODE
154
   but can be less for certain modes in special long registers.
155
   On the VAX, all registers are one word long.  */
156
#define HARD_REGNO_NREGS(REGNO, MODE)   \
157
  ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
158
 
159
/* Value is 1 if hard register REGNO can hold a value of machine-mode MODE.
160
   On the VAX, all registers can hold all modes.  */
161
#define HARD_REGNO_MODE_OK(REGNO, MODE) 1
162
 
163
/* Value is 1 if it is a good idea to tie two pseudo registers
164
   when one has mode MODE1 and one has mode MODE2.
165
   If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
166
   for any hard reg, then this must be 0 for correct output.  */
167
#define MODES_TIEABLE_P(MODE1, MODE2)  1
168
 
169
/* Specify the registers used for certain standard purposes.
170
   The values of these macros are register numbers.  */
171
 
172
/* VAX pc is overloaded on a register.  */
173
#define PC_REGNUM VAX_PC_REGNUM
174
 
175
/* Register to use for pushing function arguments.  */
176
#define STACK_POINTER_REGNUM VAX_SP_REGNUM
177
 
178
/* Base register for access to local variables of the function.  */
179
#define FRAME_POINTER_REGNUM VAX_FP_REGNUM
180
 
181
/* Offset from the frame pointer register value to the top of stack.  */
182
#define FRAME_POINTER_CFA_OFFSET(FNDECL) 0
183
 
184
/* Base register for access to arguments of the function.  */
185
#define ARG_POINTER_REGNUM VAX_AP_REGNUM
186
 
187
/* Register in which static-chain is passed to a function.  */
188
#define STATIC_CHAIN_REGNUM 0
189
 
190
/* Register in which address to store a structure value
191
   is passed to a function.  */
192
#define VAX_STRUCT_VALUE_REGNUM 1
193
 
194
/* Define the classes of registers for register constraints in the
195
   machine description.  Also define ranges of constants.
196
 
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.
200
 
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.
206
 
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.
210
 
211
   For any two classes, it is very desirable that there be another
212
   class that represents their union.  */
213
 
214
/* The VAX has only one kind of registers, so NO_REGS and ALL_REGS
215
   are the only classes.  */
216
 
217
enum reg_class { NO_REGS, ALL_REGS, LIM_REG_CLASSES };
218
 
219
#define N_REG_CLASSES (int) LIM_REG_CLASSES
220
 
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.  */
223
 
224
#define GENERAL_REGS ALL_REGS
225
 
226
/* Give names of register classes as strings for dump file.  */
227
 
228
#define REG_CLASS_NAMES \
229
  { "NO_REGS", "ALL_REGS" }
230
 
231
/* The following macro defines cover classes for Integrated Register
232
   Allocator.  Cover classes is a set of non-intersected register
233
   classes covering all hard registers used for register allocation
234
   purpose.  Any move between two registers of a cover class should be
235
   cheaper than load or store of the registers.  The macro value is
236
   array of register classes with LIM_REG_CLASSES used as the end
237
   marker.  */
238
#define IRA_COVER_CLASSES { ALL_REGS, LIM_REG_CLASSES }
239
 
240
/* Return the maximum number of consecutive registers
241
   needed to represent mode MODE in a register of class CLASS.  */
242
#define CLASS_MAX_NREGS(CLASS, MODE)    \
243
  ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
244
 
245
/* Define which registers fit in which classes.
246
   This is an initializer for a vector of HARD_REG_SET
247
   of length N_REG_CLASSES.  */
248
 
249
#define REG_CLASS_CONTENTS {{0}, {0xffff}}
250
 
251
/* The same information, inverted:
252
   Return the class number of the smallest class containing
253
   reg number REGNO.  This could be a conditional expression
254
   or could index an array.  */
255
 
256
#define REGNO_REG_CLASS(REGNO) ALL_REGS
257
 
258
/* The class value for index registers, and the one for base regs.  */
259
 
260
#define INDEX_REG_CLASS ALL_REGS
261
#define BASE_REG_CLASS ALL_REGS
262
 
263
/* Given an rtx X being reloaded into a reg required to be
264
   in class CLASS, return the class of reg to actually use.
265
   In general this is just CLASS; but on some machines
266
   in some cases it is preferable to use a more restrictive class.  */
267
 
268
#define PREFERRED_RELOAD_CLASS(X,CLASS)  (CLASS)
269
 
270
/* Return the maximum number of consecutive registers
271
   needed to represent mode MODE in a register of class CLASS.  */
272
/* On the VAX, this is always the size of MODE in words,
273
   since all registers are the same size.  */
274
#define CLASS_MAX_NREGS(CLASS, MODE)    \
275
 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
276
 
277
/* Stack layout; function entry, exit and calling.  */
278
 
279
/* Define this if pushing a word on the stack
280
   makes the stack pointer a smaller address.  */
281
#define STACK_GROWS_DOWNWARD
282
 
283
/* Define this to nonzero if the nominal address of the stack frame
284
   is at the high-address end of the local variables;
285
   that is, each additional local variable allocated
286
   goes at a more negative offset in the frame.  */
287
#define FRAME_GROWS_DOWNWARD 1
288
 
289
/* Offset within stack frame to start allocating local variables at.
290
   If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
291
   first local allocated.  Otherwise, it is the offset to the BEGINNING
292
   of the first local allocated.  */
293
#define STARTING_FRAME_OFFSET 0
294
 
295
/* Given an rtx for the address of a frame,
296
   return an rtx for the address of the word in the frame
297
   that holds the dynamic chain--the previous frame's address.  */
298
#define DYNAMIC_CHAIN_ADDRESS(FRAME) plus_constant ((FRAME), 12)
299
 
300
/* If we generate an insn to push BYTES bytes,
301
   this says how many the stack pointer really advances by.
302
   On the VAX, -(sp) pushes only the bytes of the operands.  */
303
#define PUSH_ROUNDING(BYTES) (BYTES)
304
 
305
/* Offset of first parameter from the argument pointer register value.  */
306
#define FIRST_PARM_OFFSET(FNDECL) 4
307
 
308
/* Value is the number of bytes of arguments automatically
309
   popped when returning from a subroutine call.
310
   FUNDECL is the declaration node of the function (as a tree),
311
   FUNTYPE is the data type of the function (as a tree),
312
   or for a library call it is an identifier node for the subroutine name.
313
   SIZE is the number of bytes of arguments passed on the stack.
314
 
315
   On the VAX, the RET insn pops a maximum of 255 args for any function.  */
316
 
317
#define RETURN_POPS_ARGS(FUNDECL,FUNTYPE,SIZE)  \
318
  ((SIZE) > 255 * 4 ? 0 : (SIZE))
319
 
320
/* Define how to find the value returned by a function.
321
   VALTYPE is the data type of the value (as a tree).
322
   If the precise function being called is known, FUNC is its FUNCTION_DECL;
323
   otherwise, FUNC is 0.  */
324
 
325
/* On the VAX the return value is in R0 regardless.  */
326
 
327
#define FUNCTION_VALUE(VALTYPE, FUNC)   \
328
  gen_rtx_REG (TYPE_MODE (VALTYPE), 0)
329
 
330
/* Define how to find the value returned by a library function
331
   assuming the value has mode MODE.  */
332
 
333
/* On the VAX the return value is in R0 regardless.  */
334
 
335
#define LIBCALL_VALUE(MODE)  gen_rtx_REG (MODE, 0)
336
 
337
/* Define this if PCC uses the nonreentrant convention for returning
338
   structure and union values.  */
339
 
340
#define PCC_STATIC_STRUCT_RETURN
341
 
342
/* 1 if N is a possible register number for a function value.
343
   On the VAX, R0 is the only register thus used.  */
344
 
345
#define FUNCTION_VALUE_REGNO_P(N) ((N) == 0)
346
 
347
/* 1 if N is a possible register number for function argument passing.
348
   On the VAX, no registers are used in this way.  */
349
 
350
#define FUNCTION_ARG_REGNO_P(N) 0
351
 
352
/* Define a data type for recording info about an argument list
353
   during the scan of that argument list.  This data type should
354
   hold all necessary information about the function itself
355
   and about the args processed so far, enough to enable macros
356
   such as FUNCTION_ARG to determine where the next arg should go.
357
 
358
   On the VAX, this is a single integer, which is a number of bytes
359
   of arguments scanned so far.  */
360
 
361
#define CUMULATIVE_ARGS int
362
 
363
/* Initialize a variable CUM of type CUMULATIVE_ARGS
364
   for a call to a function whose data type is FNTYPE.
365
   For a library call, FNTYPE is 0.
366
 
367
   On the VAX, the offset starts at 0.  */
368
 
369
#define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
370
 ((CUM) = 0)
371
 
372
/* Update the data in CUM to advance over an argument
373
   of mode MODE and data type TYPE.
374
   (TYPE is null for libcalls where that information may not be available.)  */
375
 
376
#define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)    \
377
  ((CUM) += ((MODE) != BLKmode                          \
378
             ? (GET_MODE_SIZE (MODE) + 3) & ~3          \
379
             : (int_size_in_bytes (TYPE) + 3) & ~3))
380
 
381
/* Define where to put the arguments to a function.
382
   Value is zero to push the argument on the stack,
383
   or a hard register in which to store the argument.
384
 
385
   MODE is the argument's machine mode.
386
   TYPE is the data type of the argument (as a tree).
387
    This is null for libcalls where that information may
388
    not be available.
389
   CUM is a variable of type CUMULATIVE_ARGS which gives info about
390
    the preceding args and about the function being called.
391
   NAMED is nonzero if this argument is a named parameter
392
    (otherwise it is an extra parameter matching an ellipsis).  */
393
 
394
/* On the VAX all args are pushed.  */
395
 
396
#define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) 0
397
 
398
/* Output assembler code to FILE to increment profiler label # LABELNO
399
   for profiling a function entry.  */
400
 
401
#define VAX_FUNCTION_PROFILER_NAME "mcount"
402
#define FUNCTION_PROFILER(FILE, LABELNO)                        \
403
  do                                                            \
404
    {                                                           \
405
      char label[256];                                          \
406
      ASM_GENERATE_INTERNAL_LABEL (label, "LP", (LABELNO));     \
407
      fprintf (FILE, "\tmovab ");                               \
408
      assemble_name (FILE, label);                              \
409
      asm_fprintf (FILE, ",%Rr0\n\tjsb %s\n",                   \
410
                   VAX_FUNCTION_PROFILER_NAME);                 \
411
    }                                                           \
412
  while (0)
413
 
414
/* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
415
   the stack pointer does not matter.  The value is tested only in
416
   functions that have frame pointers.
417
   No definition is equivalent to always zero.  */
418
 
419
#define EXIT_IGNORE_STACK 1
420
 
421
/* Store in the variable DEPTH the initial difference between the
422
   frame pointer reg contents and the stack pointer reg contents,
423
   as of the start of the function body.  This depends on the layout
424
   of the fixed parts of the stack frame and on how registers are saved.
425
 
426
   On the VAX, FRAME_POINTER_REQUIRED is always 1, so the definition of this
427
   macro doesn't matter.  But it must be defined.  */
428
 
429
#define INITIAL_FRAME_POINTER_OFFSET(DEPTH) (DEPTH) = 0;
430
 
431
/* Length in units of the trampoline for entering a nested function.  */
432
 
433
#define TRAMPOLINE_SIZE 15
434
 
435
/* Byte offset of return address in a stack frame.  The "saved PC" field
436
   is in element [4] when treating the frame as an array of longwords.  */
437
 
438
#define RETURN_ADDRESS_OFFSET   (4 * UNITS_PER_WORD)    /* 16 */
439
 
440
/* A C expression whose value is RTL representing the value of the return
441
   address for the frame COUNT steps up from the current frame.
442
   FRAMEADDR is already the frame pointer of the COUNT frame, so we
443
   can ignore COUNT.  */
444
 
445
#define RETURN_ADDR_RTX(COUNT, FRAME)                                   \
446
  ((COUNT == 0)                                                         \
447
   ? gen_rtx_MEM (Pmode, plus_constant (FRAME, RETURN_ADDRESS_OFFSET))  \
448
   : (rtx) 0)
449
 
450
 
451
/* Addressing modes, and classification of registers for them.  */
452
 
453
#define HAVE_POST_INCREMENT 1
454
 
455
#define HAVE_PRE_DECREMENT 1
456
 
457
/* Macros to check register numbers against specific register classes.  */
458
 
459
/* These assume that REGNO is a hard or pseudo reg number.
460
   They give nonzero only if REGNO is a hard reg of the suitable class
461
   or a pseudo reg currently allocated to a suitable hard reg.
462
   Since they use reg_renumber, they are safe only once reg_renumber
463
   has been allocated, which happens in local-alloc.c.  */
464
 
465
#define REGNO_OK_FOR_INDEX_P(regno)     \
466
  ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0)
467
#define REGNO_OK_FOR_BASE_P(regno)      \
468
  ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0)
469
 
470
/* Maximum number of registers that can appear in a valid memory address.  */
471
 
472
#define MAX_REGS_PER_ADDRESS 2
473
 
474
/* 1 if X is an rtx for a constant that is a valid address.  */
475
 
476
#define CONSTANT_ADDRESS_P(X) legitimate_constant_address_p (X)
477
 
478
/* Nonzero if the constant value X is a legitimate general operand.
479
   It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE.  */
480
 
481
#define LEGITIMATE_CONSTANT_P(X) legitimate_constant_p (X)
482
 
483
/* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
484
   and check its validity for a certain class.
485
   We have two alternate definitions for each of them.
486
   The usual definition accepts all pseudo regs; the other rejects
487
   them unless they have been allocated suitable hard regs.
488
   The symbol REG_OK_STRICT causes the latter definition to be used.
489
 
490
   Most source files want to accept pseudo regs in the hope that
491
   they will get allocated to the class that the insn wants them to be in.
492
   Source files for reload pass need to be strict.
493
   After reload, it makes no difference, since pseudo regs have
494
   been eliminated by then.  */
495
 
496
#ifndef REG_OK_STRICT
497
 
498
/* Nonzero if X is a hard reg that can be used as an index
499
   or if it is a pseudo reg.  */
500
#define REG_OK_FOR_INDEX_P(X) 1
501
 
502
/* Nonzero if X is a hard reg that can be used as a base reg
503
   or if it is a pseudo reg.  */
504
#define REG_OK_FOR_BASE_P(X) 1
505
 
506
#else
507
 
508
/* Nonzero if X is a hard reg that can be used as an index.  */
509
#define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
510
 
511
/* Nonzero if X is a hard reg that can be used as a base reg.  */
512
#define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
513
 
514
#endif
515
 
516
/* Go to LABEL if ADDR (a legitimate address expression)
517
   has an effect that depends on the machine mode it is used for.  */
518
#define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL) \
519
  { if (vax_mode_dependent_address_p (ADDR)) goto LABEL; }
520
 
521
/* Specify the machine mode that this machine uses
522
   for the index in the tablejump instruction.  */
523
#define CASE_VECTOR_MODE HImode
524
 
525
/* Define as C expression which evaluates to nonzero if the tablejump
526
   instruction expects the table to contain offsets from the address of the
527
   table.
528
   Do not define this if the table should contain absolute addresses.  */
529
#define CASE_VECTOR_PC_RELATIVE 1
530
 
531
/* Indicate that jump tables go in the text section.  This is
532
   necessary when compiling PIC code.  */
533
#define JUMP_TABLES_IN_TEXT_SECTION 1
534
 
535
/* Define this as 1 if `char' should by default be signed; else as 0.  */
536
#define DEFAULT_SIGNED_CHAR 1
537
 
538
/* This flag, if defined, says the same insns that convert to a signed fixnum
539
   also convert validly to an unsigned one.  */
540
#define FIXUNS_TRUNC_LIKE_FIX_TRUNC
541
 
542
/* Max number of bytes we can move from memory to memory
543
   in one reasonably fast instruction.  */
544
#define MOVE_MAX 8
545
 
546
/* If a memory-to-memory move would take MOVE_RATIO or more simple
547
   move-instruction pairs, we will do a movmem or libcall instead.  */
548
#define MOVE_RATIO(speed) ((speed) ? 6 : 3)
549
#define CLEAR_RATIO(speed) ((speed) ? 6 : 2)
550
 
551
/* Nonzero if access to memory by bytes is slow and undesirable.  */
552
#define SLOW_BYTE_ACCESS 0
553
 
554
/* Define if shifts truncate the shift count
555
   which implies one can omit a sign-extension or zero-extension
556
   of a shift count.  */
557
/* #define SHIFT_COUNT_TRUNCATED */
558
 
559
/* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
560
   is done just by pretending it is already truncated.  */
561
#define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
562
 
563
/* Specify the machine mode that pointers have.
564
   After generation of rtl, the compiler makes no further distinction
565
   between pointers and any other objects of this machine mode.  */
566
#define Pmode SImode
567
 
568
/* A function address in a call instruction
569
   is a byte address (for indexing purposes)
570
   so give the MEM rtx a byte's mode.  */
571
#define FUNCTION_MODE QImode
572
 
573
/* Specify the cost of a branch insn; roughly the number of extra insns that
574
   should be added to avoid a branch.
575
 
576
   Branches are extremely cheap on the VAX while the shift insns often
577
   used to replace branches can be expensive.  */
578
 
579
#define BRANCH_COST(speed_p, predictable_p) 0
580
 
581
/* Tell final.c how to eliminate redundant test instructions.  */
582
 
583
/* Here we define machine-dependent flags and fields in cc_status
584
   (see `conditions.h').  No extra ones are needed for the VAX.  */
585
 
586
/* Store in cc_status the expressions
587
   that the condition codes will describe
588
   after execution of an instruction whose pattern is EXP.
589
   Do not alter them if the instruction would not alter the cc's.  */
590
 
591
#define NOTICE_UPDATE_CC(EXP, INSN)     \
592
  vax_notice_update_cc ((EXP), (INSN))
593
 
594
#define OUTPUT_JUMP(NORMAL, FLOAT, NO_OV)       \
595
  { if (cc_status.flags & CC_NO_OVERFLOW)       \
596
      return NO_OV;                             \
597
    return NORMAL;                              \
598
  }
599
 
600
/* Control the assembler format that we output.  */
601
 
602
/* A C string constant describing how to begin a comment in the target
603
   assembler language.  The compiler assumes that the comment will end at
604
   the end of the line.  */
605
 
606
#define ASM_COMMENT_START "#"
607
 
608
/* Output to assembler file text saying following lines
609
   may contain character constants, extra white space, comments, etc.  */
610
 
611
#define ASM_APP_ON "#APP\n"
612
 
613
/* Output to assembler file text saying following lines
614
   no longer contain unusual constructs.  */
615
 
616
#define ASM_APP_OFF "#NO_APP\n"
617
 
618
/* Output before read-only data.  */
619
 
620
#define TEXT_SECTION_ASM_OP "\t.text"
621
 
622
/* Output before writable data.  */
623
 
624
#define DATA_SECTION_ASM_OP "\t.data"
625
 
626
/* How to refer to registers in assembler output.
627
   This sequence is indexed by compiler's hard-register-number (see above).
628
   The register names will be prefixed by REGISTER_PREFIX, if any.  */
629
 
630
#define REGISTER_PREFIX ""
631
#define REGISTER_NAMES                                  \
632
  { "r0", "r1",  "r2",  "r3", "r4", "r5", "r6", "r7",   \
633
    "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", }
634
 
635
/* This is BSD, so it wants DBX format.  */
636
 
637
#define DBX_DEBUGGING_INFO 1
638
 
639
/* Do not break .stabs pseudos into continuations.  */
640
 
641
#define DBX_CONTIN_LENGTH 0
642
 
643
/* This is the char to use for continuation (in case we need to turn
644
   continuation back on).  */
645
 
646
#define DBX_CONTIN_CHAR '?'
647
 
648
/* Don't use the `xsfoo;' construct in DBX output; this system
649
   doesn't support it.  */
650
 
651
#define DBX_NO_XREFS
652
 
653
/* Output the .stabs for a C `static' variable in the data section.  */
654
#define DBX_STATIC_STAB_DATA_SECTION
655
 
656
/* VAX specific: which type character is used for type double?  */
657
 
658
#define ASM_DOUBLE_CHAR (TARGET_G_FLOAT ? 'g' : 'd')
659
 
660
/* This is how to output a command to make the user-level label named NAME
661
   defined for reference from other files.  */
662
 
663
/* Globalizing directive for a label.  */
664
#define GLOBAL_ASM_OP ".globl "
665
 
666
/* The prefix to add to user-visible assembler symbols.  */
667
 
668
#define USER_LABEL_PREFIX "_"
669
 
670
/* This is how to store into the string LABEL
671
   the symbol_ref name of an internal numbered label where
672
   PREFIX is the class of label and NUM is the number within the class.
673
   This is suitable for output with `assemble_name'.  */
674
 
675
#define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
676
  sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
677
 
678
/* This is how to output an insn to push a register on the stack.
679
   It need not be very fast code.  */
680
 
681
#define ASM_OUTPUT_REG_PUSH(FILE,REGNO)  \
682
  fprintf (FILE, "\tpushl %s\n", reg_names[REGNO])
683
 
684
/* This is how to output an insn to pop a register from the stack.
685
   It need not be very fast code.  */
686
 
687
#define ASM_OUTPUT_REG_POP(FILE,REGNO)                                  \
688
  fprintf (FILE, "\tmovl (%s)+,%s\n", reg_names[STACK_POINTER_REGNUM],  \
689
           reg_names[REGNO])
690
 
691
/* This is how to output an element of a case-vector that is absolute.
692
   (The VAX does not use such vectors,
693
   but we must define this macro anyway.)  */
694
 
695
#define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)            \
696
  do                                                    \
697
    {                                                   \
698
      char label[256];                                  \
699
      ASM_GENERATE_INTERNAL_LABEL (label, "L", (VALUE));\
700
      fprintf (FILE, "\t.long ");                       \
701
      assemble_name (FILE, label);                      \
702
      fprintf (FILE, "\n");                             \
703
    }                                                   \
704
  while (0)
705
 
706
/* This is how to output an element of a case-vector that is relative.  */
707
 
708
#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL)        \
709
  do                                                            \
710
    {                                                           \
711
      char label[256];                                          \
712
      ASM_GENERATE_INTERNAL_LABEL (label, "L", (VALUE));        \
713
      fprintf (FILE, "\t.word ");                               \
714
      assemble_name (FILE, label);                              \
715
      ASM_GENERATE_INTERNAL_LABEL (label, "L", (REL));          \
716
      fprintf (FILE, "-");                                      \
717
      assemble_name (FILE, label);                              \
718
      fprintf (FILE, "\n");                                     \
719
    }                                                           \
720
  while (0)
721
 
722
/* This is how to output an assembler line
723
   that says to advance the location counter
724
   to a multiple of 2**LOG bytes.  */
725
 
726
#define ASM_OUTPUT_ALIGN(FILE,LOG)  \
727
  fprintf (FILE, "\t.align %d\n", (LOG))
728
 
729
/* This is how to output an assembler line
730
   that says to advance the location counter by SIZE bytes.  */
731
 
732
#define ASM_OUTPUT_SKIP(FILE,SIZE)  \
733
  fprintf (FILE, "\t.space %u\n", (int)(SIZE))
734
 
735
/* This says how to output an assembler line
736
   to define a global common symbol.  */
737
 
738
#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)    \
739
  ( fputs (".comm ", (FILE)),                           \
740
    assemble_name ((FILE), (NAME)),                     \
741
    fprintf ((FILE), ",%u\n", (int)(ROUNDED)))
742
 
743
/* This says how to output an assembler line
744
   to define a local common symbol.  */
745
 
746
#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)     \
747
  ( fputs (".lcomm ", (FILE)),                          \
748
    assemble_name ((FILE), (NAME)),                     \
749
    fprintf ((FILE), ",%u\n", (int)(ROUNDED)))
750
 
751
/* Print an instruction operand X on file FILE.
752
   CODE is the code from the %-spec that requested printing this operand;
753
   if `%z3' was used to print operand 3, then CODE is 'z'.
754
 
755
VAX operand formatting codes:
756
 
757
 letter    print
758
   c    direct branch condition
759
   C    reverse branch condition
760
   D    64-bit immediate operand
761
   B    the low 8 bits of the complement of a constant operand
762
   H    the low 16 bits of the complement of a constant operand
763
   M    a mask for the N highest bits of a word
764
   N    the complement of a constant integer operand
765
   P    constant operand plus 1
766
   R    32 - constant operand
767
   b    the low 8 bits of a negated constant operand
768
   h    the low 16 bits of a negated constant operand
769
   #    'd' or 'g' depending on whether dfloat or gfloat is used
770
   |    register prefix  */
771
 
772
/* The purpose of D is to get around a quirk or bug in VAX assembler
773
   whereby -1 in a 64-bit immediate operand means 0x00000000ffffffff,
774
   which is not a 64-bit minus one.  As a workaround, we output negative
775
   values in hex.  */
776
#if HOST_BITS_PER_WIDE_INT == 64
777
#  define NEG_HWI_PRINT_HEX16 HOST_WIDE_INT_PRINT_HEX
778
#else
779
#  define NEG_HWI_PRINT_HEX16 "0xffffffff%08lx"
780
#endif
781
 
782
#define PRINT_OPERAND_PUNCT_VALID_P(CODE)  \
783
  ((CODE) == '#' || (CODE) == '|')
784
 
785
#define PRINT_OPERAND(FILE, X, CODE)  \
786
  print_operand (FILE, X, CODE)
787
 
788
/* Print a memory operand whose address is X, on file FILE.
789
   This uses a function in output-vax.c.  */
790
 
791
#define PRINT_OPERAND_ADDRESS(FILE, ADDR)  \
792
  print_operand_address (FILE, ADDR)
793
 
794
/* This is a blatent lie.  However, it's good enough, since we don't
795
   actually have any code whatsoever for which this isn't overridden
796
   by the proper FDE definition.  */
797
#define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, PC_REGNUM)
798
 

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