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1 282 jeremybenn
/* Definitions of target machine for GNU compiler, for MMIX.
2
   Copyright (C) 2000, 2001, 2002, 2004, 2005, 2007, 2008, 2009
3
   Free Software Foundation, Inc.
4
   Contributed by Hans-Peter Nilsson (hp@bitrange.com)
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
#ifndef GCC_MMIX_H
23
#define GCC_MMIX_H
24
 
25
/* First, some local helper macros.  Note that the "default" value of
26
   FIXED_REGISTERS, CALL_USED_REGISTERS, REG_ALLOC_ORDER and
27
   REG_CLASS_CONTENTS depend on these values.  */
28
#define MMIX_RESERVED_GNU_ARG_0_REGNUM 231
29
#define MMIX_FIRST_ARG_REGNUM \
30
  (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 16)
31
#define MMIX_FIRST_INCOMING_ARG_REGNUM \
32
  (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
33
#define MMIX_MAX_ARGS_IN_REGS 16
34
 
35
/* FIXME: This one isn't fully implemented yet.  Return values larger than
36
   one register are passed by reference in MMIX_STRUCT_VALUE_REGNUM by the
37
   caller, except for return values of type "complex".  */
38
#define MMIX_MAX_REGS_FOR_VALUE 16
39
#define MMIX_RETURN_VALUE_REGNUM \
40
  (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 15)
41
#define MMIX_OUTGOING_RETURN_VALUE_REGNUM \
42
  (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
43
#define MMIX_STRUCT_VALUE_REGNUM 251
44
#define MMIX_STATIC_CHAIN_REGNUM 252
45
#define MMIX_FRAME_POINTER_REGNUM 253
46
#define MMIX_STACK_POINTER_REGNUM 254
47
#define MMIX_LAST_GENERAL_REGISTER 255
48
#define MMIX_INCOMING_RETURN_ADDRESS_REGNUM MMIX_rJ_REGNUM
49
#define MMIX_HIMULT_REGNUM 258
50
#define MMIX_REMAINDER_REGNUM MMIX_rR_REGNUM
51
#define MMIX_ARG_POINTER_REGNUM 261
52
#define MMIX_rO_REGNUM 262
53
#define MMIX_LAST_STACK_REGISTER_REGNUM 31
54
 
55
/* Four registers; "ideally, these registers should be call-clobbered", so
56
   just grab a bunch of the common clobbered registers.  FIXME: Last
57
   registers of return-value should be used, with an error if there's a
58
   return-value (that collides in size).  */
59
#define MMIX_EH_RETURN_DATA_REGNO_START (MMIX_STRUCT_VALUE_REGNUM - 4)
60
 
61
/* Try to keep the definitions from running away on their own.  */
62
#if (MMIX_EH_RETURN_DATA_REGNO_START \
63
     != MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS)
64
 #error MMIX register definition inconsistency
65
#endif
66
 
67
#if (MMIX_MAX_REGS_FOR_VALUE + MMIX_MAX_ARGS_IN_REGS > 32)
68
 #error MMIX parameters and return values bad, more than 32 registers
69
#endif
70
 
71
/* This chosen as "a call-clobbered hard register that is otherwise
72
   untouched by the epilogue".  */
73
#define MMIX_EH_RETURN_STACKADJ_REGNUM MMIX_STATIC_CHAIN_REGNUM
74
 
75
#ifdef REG_OK_STRICT
76
# define MMIX_REG_OK_STRICT 1
77
#else
78
# define MMIX_REG_OK_STRICT 0
79
#endif
80
 
81
#define MMIX_FUNCTION_ARG_SIZE(MODE, TYPE) \
82
 ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) : int_size_in_bytes (TYPE))
83
 
84
/* Per-function machine data.  This is normally an opaque type just
85
   defined and used in the tm.c file, but we need to see the definition in
86
   mmix.md too.  */
87
struct GTY(()) machine_function
88
 {
89
   int has_landing_pad;
90
   int highest_saved_stack_register;
91
   int in_prologue;
92
 };
93
 
94
/* For these target macros, there is no generic documentation here.  You
95
   should read `Using and Porting GCC' for that.  Only comments specific
96
   to the MMIX target are here.
97
 
98
   There are however references to the specific texinfo node (comments
99
   with "Node:"), so there should be little or nothing amiss.  Probably
100
   the opposite, since we don't have to care about old littering and
101
   soon outdated generic comments.  */
102
 
103
/* Node: Driver */
104
 
105
/* User symbols are in the same name-space as built-in symbols, but we
106
   don't need the built-in symbols, so remove those and instead apply
107
   stricter operand checking.  Don't warn when expanding insns.  */
108
#define ASM_SPEC "-no-predefined-syms -x"
109
 
110
/* Pass on -mset-program-start=N and -mset-data-start=M to the linker.
111
   Provide default program start 0x100 unless -mno-set-program-start.
112
   Don't do this if linking relocatably, with -r.  For a final link,
113
   produce mmo, unless ELF is requested or when linking relocatably.  */
114
#define LINK_SPEC \
115
 "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\
116
  %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\
117
  %{!mset-program-start=*:\
118
    %{!mno-set-program-start:\
119
     %{!r:--defsym __.MMIX.start..text=0x100}}}\
120
  %{!melf:%{!r:-m mmo}}%{melf|r:-m elf64mmix}"
121
 
122
/* FIXME: There's no provision for profiling here.  */
123
#define STARTFILE_SPEC  \
124
  "crti%O%s crtbegin%O%s"
125
 
126
#define ENDFILE_SPEC "crtend%O%s crtn%O%s"
127
 
128
/* Node: Run-time Target */
129
 
130
/* Define __LONG_MAX__, since we're advised not to change glimits.h.  */
131
#define TARGET_CPU_CPP_BUILTINS()                               \
132
  do                                                            \
133
    {                                                           \
134
      builtin_define ("__mmix__");                              \
135
      builtin_define ("__MMIX__");                              \
136
      if (TARGET_ABI_GNU)                                       \
137
        builtin_define ("__MMIX_ABI_GNU__");                    \
138
      else                                                      \
139
        builtin_define ("__MMIX_ABI_MMIXWARE__");               \
140
    }                                                           \
141
  while (0)
142
 
143
extern int target_flags;
144
 
145
#define TARGET_DEFAULT \
146
 (MASK_BRANCH_PREDICT | MASK_BASE_ADDRESSES | MASK_USE_RETURN_INSN)
147
 
148
/* Unfortunately, this must not reference anything in "mmix.c".  */
149
#define TARGET_VERSION \
150
  fprintf (stderr, " (MMIX)")
151
 
152
#define OVERRIDE_OPTIONS mmix_override_options ()
153
 
154
#define OPTIMIZATION_OPTIONS(LEVEL, SIZE)       \
155
  do                                            \
156
    {                                           \
157
      if (LEVEL >= 1)                           \
158
        flag_regmove = TRUE;                    \
159
                                                \
160
      if (SIZE || LEVEL > 1)                    \
161
        {                                       \
162
          flag_omit_frame_pointer = TRUE;       \
163
        }                                       \
164
    }                                           \
165
  while (0)
166
 
167
/* This one will have to wait a little bit; right now we can't debug
168
   neither with or without a frame-pointer.  */
169
/* #define CAN_DEBUG_WITHOUT_FP */
170
 
171
 
172
/* Node: Per-Function Data */
173
#define INIT_EXPANDERS mmix_init_expanders ()
174
 
175
 
176
/* Node: Storage Layout */
177
/* I see no bit-field instructions.  Anyway, the common order is from low
178
   to high, as the power of two, hence little-endian.  */
179
#define BITS_BIG_ENDIAN 0
180
#define BYTES_BIG_ENDIAN 1
181
#define WORDS_BIG_ENDIAN 1
182
#define FLOAT_WORDS_BIG_ENDIAN 1
183
#define UNITS_PER_WORD 8
184
 
185
/* We need to align everything to 64 bits that can affect the alignment
186
   of other types.  Since address N is interpreted in MMIX as (N modulo
187
   access_size), we must align.  */
188
#define PARM_BOUNDARY 64
189
#define STACK_BOUNDARY 64
190
#define FUNCTION_BOUNDARY 32
191
#define BIGGEST_ALIGNMENT 64
192
 
193
/* This one is only used in the ADA front end.  */
194
#define MINIMUM_ATOMIC_ALIGNMENT 8
195
 
196
/* Copied from elfos.h.  */
197
#define MAX_OFILE_ALIGNMENT (32768 * 8)
198
 
199
#define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
200
 mmix_data_alignment (TYPE, BASIC_ALIGN)
201
 
202
#define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
203
 mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
204
 
205
#define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
206
 mmix_local_alignment (TYPE, BASIC_ALIGN)
207
 
208
/* Following other ports, this seems to most commonly be the word-size,
209
   so let's do that here too.  */
210
#define EMPTY_FIELD_BOUNDARY 64
211
 
212
/* We chose to have this low solely for similarity with the alpha.  It has
213
   nothing to do with passing the tests dg/c99-scope-2 and
214
   execute/align-1.c.  Nothing.  Though the tests seem wrong.  Padding of
215
   the structure is automatically added to get alignment when needed if we
216
   set this to just byte-boundary.  */
217
#define STRUCTURE_SIZE_BOUNDARY 8
218
 
219
/* The lower bits are ignored.  */
220
#define STRICT_ALIGNMENT 1
221
 
222
 
223
/* Node: Type Layout */
224
 
225
/* It might seem more natural to have 64-bit ints on a 64-bit machine,
226
   but then an occasional MMIX programmer needs to know how to put a lot
227
   of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
228
   than the "intuitive" char, short and int types.  */
229
#define INT_TYPE_SIZE 32
230
#define SHORT_TYPE_SIZE 16
231
#define LONG_LONG_TYPE_SIZE 64
232
 
233
#define FLOAT_TYPE_SIZE 32
234
#define DOUBLE_TYPE_SIZE 64
235
#define LONG_DOUBLE_TYPE_SIZE 64
236
 
237
#define DEFAULT_SIGNED_CHAR 1
238
 
239
 
240
/* Node: Register Basics */
241
/* We tell GCC about all 256 general registers, and we also include
242
   rD, rE, rH, rJ, rR and rO (in that order) so we can describe what insns
243
   clobber them.  We use a faked register for the argument pointer.  It is
244
   always eliminated towards the frame-pointer or the stack-pointer, never
245
   output in assembly.  Any fixed register would do for this, like $255,
246
   but future debugging is easier when using a separate register.  It
247
   counts as a global register for pseudorandom reasons.  */
248
#define FIRST_PSEUDO_REGISTER 263
249
 
250
/* We treat general registers with no assigned purpose as fixed.  The
251
   stack pointer, $254, is also fixed.  Register $255 is referred to as a
252
   temporary register in the MMIX papers, and used as such in mmixal, so
253
   it should not be used as a stack pointer.  We set it to fixed, and use
254
   it "manually" at times of despair.  */
255
#define FIXED_REGISTERS \
256
 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
257
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
258
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
259
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
260
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
261
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
262
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
263
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
264
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
265
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
266
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
267
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
268
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
269
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
270
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
271
   1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
272
   1, 1, 0, 0, 0, 1, 1 \
273
 }
274
 
275
/* General registers are fixed and therefore "historically" marked
276
   call-used.  (FIXME: This has changed).  Registers $15..$31 are
277
   call-clobbered; we'll put arguments in $16 and up, and we need $15 for
278
   the MMIX register-stack "hole".  */
279
#define CALL_USED_REGISTERS \
280
 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, \
281
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
282
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
283
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
284
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
285
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
286
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
287
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
288
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
289
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
290
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
291
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
292
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
293
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
294
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
295
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, \
296
   1, 1, 1, 1, 1, 1, 1 \
297
 }
298
 
299
#define CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage ()
300
 
301
#define INCOMING_REGNO(OUT) mmix_opposite_regno (OUT, 0)
302
 
303
#define OUTGOING_REGNO(IN) mmix_opposite_regno (IN, 1)
304
 
305
/* Defining LOCAL_REGNO is necessary in presence of prologue/epilogue,
306
   else GCC will be confused that those registers aren't saved and
307
   restored.  */
308
#define LOCAL_REGNO(REGNO) mmix_local_regno (REGNO)
309
 
310
/* Node: Allocation Order */
311
 
312
/* We should allocate registers from 0 to 31 by increasing number, because
313
   I think that's what people expect.  Beyond that, just use
314
   call-clobbered global registers first, then call-clobbered special
315
   registers.  Last, the fixed registers.  */
316
#define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER       \
317
 { 0, 1, 2, 3, 4, 5, 6, 7,                       \
318
   8, 9, 10, 11, 12, 13, 14, 15,                \
319
   16, 17, 18, 19, 20, 21, 22, 23,              \
320
   24, 25, 26, 27, 28, 29, 30, 31,              \
321
                                                \
322
   252, 251, 250, 249, 248, 247,                \
323
                                                \
324
   253,                                         \
325
                                                \
326
   258, 260, 259,                               \
327
                                                \
328
   32, 33, 34, 35, 36, 37, 38, 39,              \
329
   40, 41, 42, 43, 44, 45, 46, 47,              \
330
   48, 49, 50, 51, 52, 53, 54, 55,              \
331
   56, 57, 58, 59, 60, 61, 62, 63,              \
332
   64, 65, 66, 67, 68, 69, 70, 71,              \
333
   72, 73, 74, 75, 76, 77, 78, 79,              \
334
   80, 81, 82, 83, 84, 85, 86, 87,              \
335
   88, 89, 90, 91, 92, 93, 94, 95,              \
336
   96, 97, 98, 99, 100, 101, 102, 103,          \
337
   104, 105, 106, 107, 108, 109, 110, 111,      \
338
   112, 113, 114, 115, 116, 117, 118, 119,      \
339
   120, 121, 122, 123, 124, 125, 126, 127,      \
340
   128, 129, 130, 131, 132, 133, 134, 135,      \
341
   136, 137, 138, 139, 140, 141, 142, 143,      \
342
   144, 145, 146, 147, 148, 149, 150, 151,      \
343
   152, 153, 154, 155, 156, 157, 158, 159,      \
344
   160, 161, 162, 163, 164, 165, 166, 167,      \
345
   168, 169, 170, 171, 172, 173, 174, 175,      \
346
   176, 177, 178, 179, 180, 181, 182, 183,      \
347
   184, 185, 186, 187, 188, 189, 190, 191,      \
348
   192, 193, 194, 195, 196, 197, 198, 199,      \
349
   200, 201, 202, 203, 204, 205, 206, 207,      \
350
   208, 209, 210, 211, 212, 213, 214, 215,      \
351
   216, 217, 218, 219, 220, 221, 222, 223,      \
352
   224, 225, 226, 227, 228, 229, 230, 231,      \
353
   232, 233, 234, 235, 236, 237, 238, 239,      \
354
   240, 241, 242, 243, 244, 245, 246,           \
355
                                                \
356
   254, 255, 256, 257, 261, 262                 \
357
 }
358
 
359
/* As a convenience, we put this nearby, for ease of comparison.
360
   First, call-clobbered registers in reverse order of assignment as
361
   parameters (also the top ones; not because they're parameters, but
362
   for continuity).
363
 
364
   Second, saved registers that go on the register-stack.
365
 
366
   Third, special registers rH, rR and rJ.  They should not normally be
367
   allocated, but since they're call-clobbered, it is cheaper to use one
368
   of them than using a call-saved register for a call-clobbered use,
369
   assuming it is referenced a very limited number of times.  Other global
370
   and fixed registers come next; they are never allocated.  */
371
#define MMIX_GNU_ABI_REG_ALLOC_ORDER            \
372
 { 252, 251, 250, 249, 248, 247, 246,           \
373
   245, 244, 243, 242, 241, 240, 239, 238,      \
374
   237, 236, 235, 234, 233, 232, 231,           \
375
                                                \
376
   0, 1, 2, 3, 4, 5, 6, 7,                       \
377
   8, 9, 10, 11, 12, 13, 14, 15,                \
378
   16, 17, 18, 19, 20, 21, 22, 23,              \
379
   24, 25, 26, 27, 28, 29, 30, 31,              \
380
                                                \
381
   253,                                         \
382
                                                \
383
   258, 260, 259,                               \
384
                                                \
385
   32, 33, 34, 35, 36, 37, 38, 39,              \
386
   40, 41, 42, 43, 44, 45, 46, 47,              \
387
   48, 49, 50, 51, 52, 53, 54, 55,              \
388
   56, 57, 58, 59, 60, 61, 62, 63,              \
389
   64, 65, 66, 67, 68, 69, 70, 71,              \
390
   72, 73, 74, 75, 76, 77, 78, 79,              \
391
   80, 81, 82, 83, 84, 85, 86, 87,              \
392
   88, 89, 90, 91, 92, 93, 94, 95,              \
393
   96, 97, 98, 99, 100, 101, 102, 103,          \
394
   104, 105, 106, 107, 108, 109, 110, 111,      \
395
   112, 113, 114, 115, 116, 117, 118, 119,      \
396
   120, 121, 122, 123, 124, 125, 126, 127,      \
397
   128, 129, 130, 131, 132, 133, 134, 135,      \
398
   136, 137, 138, 139, 140, 141, 142, 143,      \
399
   144, 145, 146, 147, 148, 149, 150, 151,      \
400
   152, 153, 154, 155, 156, 157, 158, 159,      \
401
   160, 161, 162, 163, 164, 165, 166, 167,      \
402
   168, 169, 170, 171, 172, 173, 174, 175,      \
403
   176, 177, 178, 179, 180, 181, 182, 183,      \
404
   184, 185, 186, 187, 188, 189, 190, 191,      \
405
   192, 193, 194, 195, 196, 197, 198, 199,      \
406
   200, 201, 202, 203, 204, 205, 206, 207,      \
407
   208, 209, 210, 211, 212, 213, 214, 215,      \
408
   216, 217, 218, 219, 220, 221, 222, 223,      \
409
   224, 225, 226, 227, 228, 229, 230,           \
410
                                                \
411
   254, 255, 256, 257, 261, 262                 \
412
 }
413
 
414
/* The default one.  */
415
#define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
416
 
417
/* Node: Values in Registers */
418
 
419
#define HARD_REGNO_NREGS(REGNO, MODE)                   \
420
   ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1)         \
421
    / UNITS_PER_WORD)
422
 
423
#define HARD_REGNO_MODE_OK(REGNO, MODE) 1
424
 
425
/* Note that no register can really be accessed in single-float mode, so
426
   we *can* say 1 here.  FIXME:  Will TRT happen for single-float, or do
427
   we have to punt to libgcc1.asm?  */
428
#define MODES_TIEABLE_P(MODE1, MODE2) 1
429
 
430
 
431
/* Node: Leaf Functions */
432
/* (empty) */
433
 
434
 
435
/* Node: Register Classes */
436
 
437
enum reg_class
438
 {
439
   NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
440
   SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
441
 };
442
 
443
#define N_REG_CLASSES (int) LIM_REG_CLASSES
444
 
445
#define REG_CLASS_NAMES                                         \
446
 {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG",     \
447
  "SYSTEM_REGS", "ALL_REGS"}
448
 
449
/* Note that the contents of each item is always 32 bits.  */
450
#define REG_CLASS_CONTENTS                      \
451
 {{0, 0, 0, 0, 0, 0, 0, 0, 0},                   \
452
  {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20},       \
453
  {0, 0, 0, 0, 0, 0, 0, 0, 0x10},               \
454
  {0, 0, 0, 0, 0, 0, 0, 0, 4},                  \
455
  {0, 0, 0, 0, 0, 0, 0, 0, 0x7f},               \
456
  {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x7f}}
457
 
458
#define REGNO_REG_CLASS(REGNO)                                  \
459
 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
460
  || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
461
  ? GENERAL_REGS                                                \
462
  : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG            \
463
  : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
464
 
465
#define BASE_REG_CLASS GENERAL_REGS
466
 
467
#define INDEX_REG_CLASS GENERAL_REGS
468
 
469
#define REG_CLASS_FROM_LETTER(CHAR)             \
470
 ((CHAR) == 'x' ? SYSTEM_REGS                   \
471
  : (CHAR) == 'y' ? REMAINDER_REG               \
472
  : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
473
 
474
#define REGNO_OK_FOR_BASE_P(REGNO)                              \
475
 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
476
  || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
477
  || (reg_renumber[REGNO] > 0                                    \
478
      && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
479
 
480
#define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
481
 
482
#define PREFERRED_RELOAD_CLASS(X, CLASS) \
483
 mmix_preferred_reload_class (X, CLASS)
484
 
485
#define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
486
 mmix_preferred_output_reload_class (X, CLASS)
487
 
488
#define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
489
 mmix_secondary_reload_class (CLASS, MODE, X, 1)
490
 
491
#define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
492
 mmix_secondary_reload_class (CLASS, MODE, X, 0)
493
 
494
#define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
495
 
496
#define CONST_OK_FOR_LETTER_P(VALUE, C) \
497
 mmix_const_ok_for_letter_p (VALUE, C)
498
 
499
#define EXTRA_CONSTRAINT(VALUE, C)      \
500
 mmix_extra_constraint (VALUE, C, MMIX_REG_OK_STRICT)
501
 
502
/* Do we need anything serious here?  Yes, any FLOT constant.  */
503
#define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)                  \
504
 mmix_const_double_ok_for_letter_p (VALUE, C)
505
 
506
 
507
/* Node: Frame Layout */
508
 
509
#define STACK_GROWS_DOWNWARD
510
#define FRAME_GROWS_DOWNWARD 1
511
 
512
#define STARTING_FRAME_OFFSET \
513
  mmix_starting_frame_offset ()
514
 
515
#define FIRST_PARM_OFFSET(FUNDECL) 0
516
 
517
#define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
518
 mmix_dynamic_chain_address (FRAMEADDR)
519
 
520
/* FIXME: It seems RETURN_ADDR_OFFSET is undocumented.  */
521
 
522
#define SETUP_FRAME_ADDRESSES() \
523
 mmix_setup_frame_addresses ()
524
 
525
#define RETURN_ADDR_RTX(COUNT, FRAME)           \
526
 mmix_return_addr_rtx (COUNT, FRAME)
527
 
528
/* It's in rJ before we store it somewhere.  */
529
#define INCOMING_RETURN_ADDR_RTX \
530
 gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
531
 
532
/* FIXME: This does not seem properly documented or cross-indexed.
533
   Nowhere except in the code does it say it *has* to be in the range
534
   0..255, or else it will be truncated.  That goes for the default too.  */
535
#define DWARF_FRAME_RETURN_COLUMN \
536
 DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
537
 
538
/* No return address is stored there.  */
539
#define INCOMING_FRAME_SP_OFFSET 0
540
 
541
/* Node: Stack Checking */
542
/* (empty) */
543
 
544
 
545
/* Node: Exception Handling */
546
 
547
#define EH_RETURN_DATA_REGNO(N) \
548
 mmix_eh_return_data_regno (N)
549
 
550
#define EH_RETURN_STACKADJ_RTX \
551
 mmix_eh_return_stackadj_rtx ()
552
 
553
#define EH_RETURN_HANDLER_RTX \
554
 mmix_eh_return_handler_rtx ()
555
 
556
#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
557
 mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
558
 
559
/* Node: Frame Registers */
560
#define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
561
 
562
/* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
563
   what register we want to use.  */
564
#define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
565
#define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
566
 
567
#define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
568
 
569
 
570
/* Node: Elimination */
571
 
572
/* The frame-pointer is stored in a location that either counts to the
573
   offset of incoming parameters, or that counts to the offset of the
574
   frame, so we can't use a single offset.  We therefore eliminate those
575
   two separately.  */
576
#define ELIMINABLE_REGS                         \
577
 {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
578
  {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
579
  {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
580
 
581
#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
582
 (OFFSET) = mmix_initial_elimination_offset (FROM, TO)
583
 
584
 
585
/* Node: Stack Arguments */
586
 
587
#define ACCUMULATE_OUTGOING_ARGS 1
588
 
589
#define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
590
 
591
 
592
/* Node: Register Arguments */
593
#define FUNCTION_ARG(CUM, MODE, TYPE, NAMED)    \
594
 mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 0)
595
 
596
#define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED)   \
597
 mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 1)
598
 
599
typedef struct { int regs; int lib; } CUMULATIVE_ARGS;
600
 
601
#define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
602
 ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0))
603
 
604
#define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)            \
605
 ((CUM).regs                                                    \
606
  = ((targetm.calls.must_pass_in_stack (MODE, TYPE))            \
607
     || (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE) > 8                \
608
         && !TARGET_LIBFUNC && !(CUM).lib))                     \
609
  ? (MMIX_MAX_ARGS_IN_REGS) + 1                                 \
610
  : (CUM).regs + (7 + (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE))) / 8)
611
 
612
#define FUNCTION_ARG_REGNO_P(REGNO)             \
613
 mmix_function_arg_regno_p (REGNO, 0)
614
 
615
 
616
/* Node: Register Arguments */
617
 
618
#define FUNCTION_VALUE(VALTYPE, FUNC)  \
619
 gen_rtx_REG (TYPE_MODE (VALTYPE), MMIX_RETURN_VALUE_REGNUM)
620
 
621
/* This needs to take care of the register hole for complex return values.  */
622
#define FUNCTION_OUTGOING_VALUE(VALTYPE, FUNC)  \
623
 mmix_function_outgoing_value (VALTYPE, FUNC)
624
 
625
#define LIBCALL_VALUE(MODE) \
626
 gen_rtx_REG (MODE, MMIX_RETURN_VALUE_REGNUM)
627
 
628
#define FUNCTION_VALUE_REGNO_P(REGNO) \
629
 mmix_function_value_regno_p (REGNO)
630
 
631
 
632
/* Node: Caller Saves */
633
/* (empty) */
634
 
635
 
636
/* Node: Function Entry */
637
 
638
/* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
639
   TARGET_ASM_FUNCTION_EPILOGUE.  */
640
 
641
/* We need to say that the epilogue uses the return address, so the
642
   initial-value machinery restores it.  FIXME: Some targets
643
   conditionalize on "reload_completed &&".  Investigate difference.
644
   FIXME: Not needed if nonlocal_goto_stack_level.  */
645
#define EPILOGUE_USES(REGNO) \
646
 ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
647
 
648
/* Node: Profiling */
649
#define FUNCTION_PROFILER(FILE, LABELNO)        \
650
 mmix_function_profiler (FILE, LABELNO)
651
 
652
/* Node: Trampolines */
653
 
654
#define TRAMPOLINE_SIZE         (4*UNITS_PER_WORD)
655
#define TRAMPOLINE_ALIGNMENT    BITS_PER_WORD
656
 
657
/* Node: Addressing Modes */
658
 
659
#define CONSTANT_ADDRESS_P(X) \
660
 mmix_constant_address_p (X)
661
 
662
#define MAX_REGS_PER_ADDRESS 2
663
 
664
#ifndef REG_OK_STRICT
665
# define REG_OK_FOR_BASE_P(X)                   \
666
  (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER      \
667
   || REGNO (X) == MMIX_ARG_POINTER_REGNUM      \
668
   || REGNO (X) >= FIRST_PSEUDO_REGISTER)
669
#else
670
# define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
671
#endif /* REG_OK_STRICT */
672
 
673
#define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
674
 
675
#define LEGITIMATE_CONSTANT_P(X) \
676
 mmix_legitimate_constant_p (X)
677
 
678
 
679
/* Node: Condition Code */
680
 
681
#define SELECT_CC_MODE(OP, X, Y)                \
682
 mmix_select_cc_mode (OP, X, Y)
683
 
684
/* A definition of CANONICALIZE_COMPARISON that changed LE and GT
685
   comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU
686
   comparisons with 256 to 255 and LE, LEU, GT and GTU has been
687
   ineffective; the code path for performing the changes did not trig for
688
   neither the GCC testsuite nor ghostscript-6.52 nor Knuth's mmix.tar.gz
689
   itself (core GCC functionality supposedly handling it) with sources
690
   from 2002-06-06.  */
691
 
692
#define REVERSIBLE_CC_MODE(MODE)                \
693
 mmix_reversible_cc_mode (MODE)
694
 
695
 
696
/* Node: Costs */
697
 
698
/* The special registers can only move to and from general regs, and we
699
   need to check that their constraints match, so say 3 for them.  */
700
/* WARNING: gcc-2.7.2.2 i686-pc-linux-gnulibc1 (as shipped with RH 4.2)
701
   miscompiles reload1.c:reload_cse_simplify_set; a call to
702
   reload_cse_regno_equal_p is missing when checking if a substitution of
703
   a register setting is valid if this is defined to just the expression
704
   in mmix_register_move_cost.
705
 
706
   Symptom: a (all?) register setting is optimized away for e.g.
707
   "char *p1(char *p) { return p+1; }" and the value of register zero ($0)
708
   is returned.
709
 
710
   We can workaround by making this a function call - unknown if this
711
   causes dire speed effects.  */
712
#define REGISTER_MOVE_COST(MODE, FROM, TO) \
713
 mmix_register_move_cost (MODE, FROM, TO)
714
 
715
#define SLOW_BYTE_ACCESS 0
716
 
717
 
718
/* Node: Sections */
719
 
720
/* This must be a constant string, since it's used in crtstuff.c.  */
721
#define TEXT_SECTION_ASM_OP \
722
 "\t.text ! mmixal:= 9H LOC 8B"
723
 
724
/* FIXME: Not documented.  */
725
#define DATA_SECTION_ASM_OP \
726
 mmix_data_section_asm_op ()
727
 
728
#define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rodata"
729
 
730
/* Node: PIC */
731
/* (empty) */
732
 
733
 
734
/* Node: File Framework */
735
 
736
/* While any other punctuation character but ";" would do, we prefer "%"
737
   or "!"; "!" is an unary operator and so will not be mistakenly included
738
   in correctly formed expressions.  The hash character adds mass; catches
739
   the eye.  We can't have it as a comment char by itself, since it's a
740
   hex-number prefix.  */
741
#define ASM_COMMENT_START "!#"
742
 
743
/* These aren't currently functional.  We just keep them as markers.  */
744
#define ASM_APP_ON "%APP\n"
745
#define ASM_APP_OFF "%NO_APP\n"
746
 
747
#define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
748
 mmix_asm_output_source_filename (STREAM, NAME)
749
 
750
#define OUTPUT_QUOTED_STRING(STREAM, STRING) \
751
 mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
752
 
753
#define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
754
 
755
/* Node: Data Output */
756
 
757
#define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
758
 mmix_asm_output_ascii (STREAM, PTR, LEN)
759
 
760
/* Node: Uninitialized Data */
761
 
762
#define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
763
 mmix_asm_output_aligned_common (ST, N, S, A)
764
 
765
#define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
766
 mmix_asm_output_aligned_local (ST, N, S, A)
767
 
768
 
769
/* Node: Label Output */
770
 
771
#define ASM_OUTPUT_LABEL(STREAM, NAME) \
772
 mmix_asm_output_label (STREAM, NAME)
773
 
774
#define ASM_OUTPUT_INTERNAL_LABEL(STREAM, NAME) \
775
 mmix_asm_output_internal_label (STREAM, NAME)
776
 
777
#define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
778
 mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
779
 
780
#define GLOBAL_ASM_OP "\t.global "
781
 
782
#define ASM_WEAKEN_LABEL(STREAM, NAME) \
783
 mmix_asm_weaken_label (STREAM, NAME)
784
 
785
#define MAKE_DECL_ONE_ONLY(DECL) \
786
 mmix_make_decl_one_only (DECL)
787
 
788
#define ASM_OUTPUT_LABELREF(STREAM, NAME) \
789
 mmix_asm_output_labelref (STREAM, NAME)
790
 
791
/* We insert a ":" to disambiguate against user symbols like L5.  */
792
#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
793
 sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
794
 
795
/* Insert "::"; these are rarer than internal labels.  FIXME: Make sure no
796
   ":" is seen in the object file; we don't really want that mmixal
797
   feature visible there.  We don't want the default, which uses a dot;
798
   that'd be incompatible with mmixal.  */
799
#define ASM_PN_FORMAT "%s::%lu"
800
 
801
#define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
802
 mmix_asm_output_def (STREAM, NAME, VALUE)
803
 
804
/* Node: Macros for Initialization */
805
/* We're compiling to ELF and linking to MMO; fundamental ELF features
806
   that GCC depend on are there.  */
807
 
808
/* These must be constant strings, since they're used in crtstuff.c.  */
809
#define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
810
 
811
#define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
812
 
813
#define OBJECT_FORMAT_ELF
814
 
815
 
816
/* Node: Instruction Output */
817
 
818
/* The non-$ register names must be prefixed with ":", since they're
819
   affected by PREFIX.  We provide the non-colon names as additional
820
   names.  */
821
#define REGISTER_NAMES                                                  \
822
 {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7",                       \
823
  "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15",                 \
824
  "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23",               \
825
  "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31",               \
826
  "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39",               \
827
  "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47",               \
828
  "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55",               \
829
  "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63",               \
830
  "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71",               \
831
  "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79",               \
832
  "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87",               \
833
  "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95",               \
834
  "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103",           \
835
  "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111",       \
836
  "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119",       \
837
  "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127",       \
838
  "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135",       \
839
  "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143",       \
840
  "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151",       \
841
  "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159",       \
842
  "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167",       \
843
  "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175",       \
844
  "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183",       \
845
  "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191",       \
846
  "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199",       \
847
  "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207",       \
848
  "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215",       \
849
  "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223",       \
850
  "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231",       \
851
  "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239",       \
852
  "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247",       \
853
  "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255",       \
854
  ":rD",  ":rE",  ":rH",  ":rJ",  ":rR",  "ap_!BAD!", ":rO"}
855
 
856
#define ADDITIONAL_REGISTER_NAMES                       \
857
 {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257},  \
858
  {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}, {"rO", MMIX_rO_REGNUM}}
859
 
860
#define PRINT_OPERAND(STREAM, X, CODE) \
861
 mmix_print_operand (STREAM, X, CODE)
862
 
863
#define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
864
 mmix_print_operand_punct_valid_p (CODE)
865
 
866
#define PRINT_OPERAND_ADDRESS(STREAM, X) \
867
 mmix_print_operand_address (STREAM, X)
868
 
869
#define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
870
 mmix_asm_output_reg_push (STREAM, REGNO)
871
 
872
#define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
873
 mmix_asm_output_reg_pop (STREAM, REGNO)
874
 
875
 
876
/* Node: Dispatch Tables */
877
 
878
/* We define both types, since SImode is the better, but DImode the only
879
   possible for mmixal so that's the one actually used.  */
880
#define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
881
 mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
882
 
883
#define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
884
 mmix_asm_output_addr_vec_elt (STREAM, VALUE)
885
 
886
 
887
/* Node: Exception Region Output */
888
/* (empty) */
889
 
890
/* Node: Alignment Output */
891
 
892
#define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
893
 mmix_asm_output_skip (STREAM, NBYTES)
894
 
895
#define ASM_OUTPUT_ALIGN(STREAM, POWER) \
896
 mmix_asm_output_align (STREAM, POWER)
897
 
898
 
899
/* Node: All Debuggers */
900
 
901
#define DBX_REGISTER_NUMBER(REGNO) \
902
 mmix_dbx_register_number (REGNO)
903
 
904
 
905
/* Node: DBX Options */
906
/* (empty) */
907
/* Node: DBX Hooks */
908
/* (empty) */
909
/* Node: File Names and DBX */
910
/* (empty) */
911
 
912
 
913
/* Node: SDB and DWARF */
914
#define DWARF2_DEBUGGING_INFO 1
915
#define DWARF2_ASM_LINE_DEBUG_INFO 1
916
 
917
/* Node: Misc */
918
 
919
/* There's no way to get a PC-relative offset into tables for SImode, so
920
   for the moment we have absolute entries in DImode.
921
   When we're going ELF, these should be SImode and 1.  */
922
#define CASE_VECTOR_MODE DImode
923
#define CASE_VECTOR_PC_RELATIVE 0
924
 
925
#define WORD_REGISTER_OPERATIONS
926
 
927
/* We have a choice, which makes this yet another parameter to tweak.  The
928
   gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
929
   than "unsigned int", and we have signed characters.  FIXME: measure.  */
930
#define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
931
 
932
#define MOVE_MAX 8
933
 
934
#define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
935
 
936
/* ??? MMIX allows a choice of STORE_FLAG_VALUE.  Revisit later,
937
   we don't have scc expanders yet.  */
938
 
939
#define Pmode DImode
940
 
941
#define FUNCTION_MODE QImode
942
 
943
#define NO_IMPLICIT_EXTERN_C
944
 
945
#define HANDLE_SYSV_PRAGMA 1
946
 
947
/* These are checked.  */
948
#define DOLLARS_IN_IDENTIFIERS 0
949
#define NO_DOLLAR_IN_LABEL
950
#define NO_DOT_IN_LABEL
951
 
952
#endif /* GCC_MMIX_H */
953
/*
954
 * Local variables:
955
 * eval: (c-set-style "gnu")
956
 * indent-tabs-mode: t
957
 * End:
958
 */

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