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target-def.h (TARGET_ASM_OUTPUT_MI_THUNK): Default to NULL.
[gcc.git] / gcc / config / mmix / mmix.h
1 /* Definitions of target machine for GNU compiler, for MMIX.
2 Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
3 Contributed by Hans-Peter Nilsson (hp@bitrange.com)
4
5 This file is part of GCC.
6
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)
10 any later version.
11
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.
16
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, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
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 /* Declarations for helper variables that are not tied to a particular
85 target macro. */
86 extern GTY(()) rtx mmix_compare_op0;
87 extern GTY(()) rtx mmix_compare_op1;
88
89 /* Per-function machine data. This is normally an opaque type just
90 defined and used in the tm.c file, but we need to see the definition in
91 mmix.md too. */
92 struct machine_function GTY(())
93 {
94 int has_landing_pad;
95 int highest_saved_stack_register;
96 int in_prologue;
97 };
98
99 /* For these target macros, there is no generic documentation here. You
100 should read `Using and Porting GCC' for that. Only comments specific
101 to the MMIX target are here.
102
103 There are however references to the specific texinfo node (comments
104 with "Node:"), so there should be little or nothing amiss. Probably
105 the opposite, since we don't have to care about old littering and
106 soon outdated generic comments. */
107
108 /* Node: Driver */
109
110 /* User symbols are in the same name-space as built-in symbols, but we
111 don't need the built-in symbols, so remove those and instead apply
112 stricter operand checking. Don't warn when expanding insns. */
113 #define ASM_SPEC "-no-predefined-syms -x"
114
115 /* Pass on -mset-program-start=N and -mset-data-start=M to the linker.
116 Provide default program start 0x100 unless -mno-set-program-start.
117 Don't do this if linking relocatably, with -r. For a final link,
118 produce mmo, unless ELF is requested or when linking relocatably. */
119 #define LINK_SPEC \
120 "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\
121 %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\
122 %{!mset-program-start=*:\
123 %{!mno-set-program-start:\
124 %{!r:--defsym __.MMIX.start..text=0x100}}}\
125 %{!melf:%{!r:-m mmo}}%{melf|r:-m elf64mmix}"
126
127 /* Put unused option values here. */
128 extern const char *mmix_cc1_ignored_option;
129
130 #define TARGET_OPTIONS \
131 {{"set-program-start=", &mmix_cc1_ignored_option, \
132 N_("Set start-address of the program") }, \
133 {"set-data-start=", &mmix_cc1_ignored_option, \
134 N_("Set start-address of data")}}
135
136 /* FIXME: There's no provision for profiling here. */
137 #define STARTFILE_SPEC \
138 "crti%O%s crtbegin%O%s"
139
140 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
141
142 /* Node: Run-time Target */
143
144 /* Define __LONG_MAX__, since we're advised not to change glimits.h. */
145 #define TARGET_CPU_CPP_BUILTINS() \
146 do \
147 { \
148 builtin_define ("__mmix__"); \
149 builtin_define ("__MMIX__"); \
150 if (TARGET_ABI_GNU) \
151 builtin_define ("__MMIX_ABI_GNU__"); \
152 else \
153 builtin_define ("__MMIX_ABI_MMIXWARE__"); \
154 } \
155 while (0)
156
157 extern int target_flags;
158
159 #define TARGET_MASK_LIBFUNCS 1
160 #define TARGET_MASK_ABI_GNU 2
161 #define TARGET_MASK_FCMP_EPSILON 4
162 #define TARGET_MASK_ZERO_EXTEND 8
163 #define TARGET_MASK_KNUTH_DIVISION 16
164 #define TARGET_MASK_TOPLEVEL_SYMBOLS 32
165 #define TARGET_MASK_BRANCH_PREDICT 64
166 #define TARGET_MASK_USE_RETURN_INSN 128
167
168 /* We use the term "base address" since that's what Knuth uses. The base
169 address goes in a global register. When addressing, it's more like
170 "base address plus offset", with the offset being 0..255 from the base,
171 which itself can be a symbol plus an offset. The effect is like having
172 a constant pool in global registers, code offseting from those
173 registers (automatically causing a request for a suitable constant base
174 address register) without having to know the specific register or the
175 specific offset. The setback is that there's a limited number of
176 registers, and you'll not find out until link time whether you
177 should've compiled with -mno-base-addresses. */
178 #define TARGET_MASK_BASE_ADDRESSES 128
179
180 /* FIXME: Get rid of this one. */
181 #define TARGET_LIBFUNC (target_flags & TARGET_MASK_LIBFUNCS)
182 #define TARGET_ABI_GNU (target_flags & TARGET_MASK_ABI_GNU)
183 #define TARGET_FCMP_EPSILON (target_flags & TARGET_MASK_FCMP_EPSILON)
184 #define TARGET_ZERO_EXTEND (target_flags & TARGET_MASK_ZERO_EXTEND)
185 #define TARGET_KNUTH_DIVISION (target_flags & TARGET_MASK_KNUTH_DIVISION)
186 #define TARGET_TOPLEVEL_SYMBOLS (target_flags & TARGET_MASK_TOPLEVEL_SYMBOLS)
187 #define TARGET_BRANCH_PREDICT (target_flags & TARGET_MASK_BRANCH_PREDICT)
188 #define TARGET_BASE_ADDRESSES (target_flags & TARGET_MASK_BASE_ADDRESSES)
189 #define TARGET_USE_RETURN_INSN (target_flags & TARGET_MASK_USE_RETURN_INSN)
190
191 #define TARGET_DEFAULT \
192 (TARGET_MASK_BRANCH_PREDICT | TARGET_MASK_BASE_ADDRESSES \
193 | TARGET_MASK_USE_RETURN_INSN)
194
195 /* FIXME: Provide a way to *load* the epsilon register. */
196 #define TARGET_SWITCHES \
197 {{"libfuncs", TARGET_MASK_LIBFUNCS, \
198 N_("For intrinsics library: pass all parameters in registers")}, \
199 {"no-libfuncs", -TARGET_MASK_LIBFUNCS, ""}, \
200 {"abi=mmixware", -TARGET_MASK_ABI_GNU, \
201 N_("Use register stack for parameters and return value")}, \
202 {"abi=gnu", TARGET_MASK_ABI_GNU, \
203 N_("Use call-clobbered registers for parameters and return value")}, \
204 {"epsilon", TARGET_MASK_FCMP_EPSILON, \
205 N_("Use epsilon-respecting floating point compare instructions")}, \
206 {"no-epsilon", -TARGET_MASK_FCMP_EPSILON, ""}, \
207 {"zero-extend", TARGET_MASK_ZERO_EXTEND, \
208 N_("Use zero-extending memory loads, not sign-extending ones")}, \
209 {"no-zero-extend", -TARGET_MASK_ZERO_EXTEND, ""}, \
210 {"knuthdiv", TARGET_MASK_KNUTH_DIVISION, \
211 N_("Generate divide results with reminder having the same sign as the\
212 divisor (not the dividend)")}, \
213 {"no-knuthdiv", -TARGET_MASK_KNUTH_DIVISION, ""}, \
214 {"toplevel-symbols", TARGET_MASK_TOPLEVEL_SYMBOLS, \
215 N_("Prepend global symbols with \":\" (for use with PREFIX)")}, \
216 {"no-toplevel-symbols", -TARGET_MASK_TOPLEVEL_SYMBOLS, \
217 N_("Do not provide a default start-address 0x100 of the program")}, \
218 {"elf", 0, \
219 N_("Link to emit program in ELF format (rather than mmo)")}, \
220 {"branch-predict", TARGET_MASK_BRANCH_PREDICT, \
221 N_("Use P-mnemonics for branches statically predicted as taken")}, \
222 {"no-branch-predict", -TARGET_MASK_BRANCH_PREDICT, \
223 N_("Don't use P-mnemonics for branches")}, \
224 {"base-addresses", TARGET_MASK_BASE_ADDRESSES, \
225 N_("Use addresses that allocate global registers")}, \
226 {"no-base-addresses", -TARGET_MASK_BASE_ADDRESSES, \
227 N_("Do not use addresses that allocate global registers")}, \
228 {"single-exit", -TARGET_MASK_USE_RETURN_INSN, \
229 N_("Generate a single exit point for each function")}, \
230 {"no-single-exit", TARGET_MASK_USE_RETURN_INSN, \
231 N_("Do not generate a single exit point for each function")}, \
232 {"", TARGET_DEFAULT, ""}}
233
234 /* Unfortunately, this must not reference anything in "mmix.c". */
235 #define TARGET_VERSION \
236 fprintf (stderr, " (MMIX)")
237
238 #define OVERRIDE_OPTIONS mmix_override_options ()
239
240 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE) \
241 do \
242 { \
243 if (LEVEL >= 1) \
244 flag_regmove = TRUE; \
245 \
246 if (SIZE || LEVEL > 1) \
247 { \
248 flag_omit_frame_pointer = TRUE; \
249 flag_strength_reduce = FALSE; \
250 } \
251 } \
252 while (0)
253
254 /* This one will have to wait a little bit; right now we can't debug
255 neither with or without a frame-pointer. */
256 /* #define CAN_DEBUG_WITHOUT_FP */
257
258
259 /* Node: Per-Function Data */
260 #define INIT_EXPANDERS mmix_init_expanders ()
261
262
263 /* Node: Storage Layout */
264 /* I see no bit-field instructions. Anyway, the common order is from low
265 to high, as the power of two, hence little-endian. */
266 #define BITS_BIG_ENDIAN 0
267 #define BYTES_BIG_ENDIAN 1
268 #define WORDS_BIG_ENDIAN 1
269 #define FLOAT_WORDS_BIG_ENDIAN 1
270 #define UNITS_PER_WORD 8
271
272 /* FIXME: This macro is correlated to MAX_FIXED_MODE_SIZE in that
273 e.g. this macro must not be 8 (default, UNITS_PER_WORD) when
274 MAX_FIXED_MODE_SIZE is 64 (default, DImode), or really: this must be
275 set manually if MAX_FIXED_MODE_SIZE is not at least twice the register
276 size. By setting it to 4, we don't have to worry about TImode things
277 yet. Revisit, perhaps get TImode going or get some solution that does
278 not mandate TImode or lie in other ways. */
279 #define MIN_UNITS_PER_WORD 4
280
281 /* FIXME: Promotion of modes currently generates slow code, extending
282 before every operation. */
283
284 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE) \
285 do { \
286 if (GET_MODE_CLASS (MODE) == MODE_INT \
287 && GET_MODE_SIZE (MODE) < 8) \
288 { \
289 (MODE) = DImode; \
290 /* Do the following some time later, \
291 scrutinizing differences. */ \
292 if (0) (UNSIGNEDP) = 0; \
293 } \
294 } while (0)
295
296 #define PROMOTE_FUNCTION_ARGS
297
298 #if 0
299 /* Apparently not doing TRT if int < register-size. FIXME: Perhaps
300 FUNCTION_VALUE and LIBCALL_VALUE needs tweaking as some ports say. */
301 #define PROMOTE_FUNCTION_RETURN
302 #endif
303
304 /* I'm a little bit undecided about this one. It might be beneficial to
305 promote all operations. */
306 #define PROMOTE_FOR_CALL_ONLY
307
308 /* We need to align everything to 64 bits that can affect the alignment
309 of other types. Since address N is interpreted in MMIX as (N modulo
310 access_size), we must align. */
311 #define PARM_BOUNDARY 64
312 #define STACK_BOUNDARY 64
313 #define FUNCTION_BOUNDARY 32
314 #define BIGGEST_ALIGNMENT 64
315
316 /* This one is only used in the ADA front end. */
317 #define MINIMUM_ATOMIC_ALIGNMENT 8
318
319 /* Copied from elfos.h. */
320 #define MAX_OFILE_ALIGNMENT (32768 * 8)
321
322 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
323 mmix_data_alignment (TYPE, BASIC_ALIGN)
324
325 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
326 mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
327
328 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
329 mmix_local_alignment (TYPE, BASIC_ALIGN)
330
331 /* Following other ports, this seems to most commonly be the word-size,
332 so let's do that here too. */
333 #define EMPTY_FIELD_BOUNDARY 64
334
335 /* We chose to have this low solely for similarity with the alpha. It has
336 nothing to do with passing the tests dg/c99-scope-2 and
337 execute/align-1.c. Nothing. Though the tests seem wrong. Padding of
338 the structure is automatically added to get alignment when needed if we
339 set this to just byte-boundary. */
340 #define STRUCTURE_SIZE_BOUNDARY 8
341
342 /* The lower bits are ignored. */
343 #define STRICT_ALIGNMENT 1
344
345
346 /* Node: Type Layout */
347
348 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
349 but then an occasional MMIX programmer needs to know how to put a lot
350 of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
351 than the "intuitive" char, short and int types. */
352 #define INT_TYPE_SIZE 32
353 #define SHORT_TYPE_SIZE 16
354 #define LONG_LONG_TYPE_SIZE 64
355
356 #define FLOAT_TYPE_SIZE 32
357 #define DOUBLE_TYPE_SIZE 64
358 #define LONG_DOUBLE_TYPE_SIZE 64
359
360 #define DEFAULT_SIGNED_CHAR 1
361
362
363 /* Node: Register Basics */
364 /* We tell GCC about all 256 general registers, and we also include
365 rD, rE, rH, rJ, rR and rO (in that order) so we can describe what insns
366 clobber them. We use a faked register for the argument pointer. It is
367 always eliminated towards the frame-pointer or the stack-pointer, never
368 output in assembly. Any fixed register would do for this, like $255,
369 but future debugging is easier when using a separate register. It
370 counts as a global register for pseudorandom reasons. */
371 #define FIRST_PSEUDO_REGISTER 263
372
373 /* We treat general registers with no assigned purpose as fixed. The
374 stack pointer, $254, is also fixed. Register $255 is referred to as a
375 temporary register in the MMIX papers, and used as such in mmixal, so
376 it should not be used as a stack pointer. We set it to fixed, and use
377 it "manually" at times of despair. */
378 #define FIXED_REGISTERS \
379 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
380 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
381 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
382 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
383 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
384 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
385 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
386 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
387 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
388 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
389 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
390 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
391 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
392 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
393 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
394 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
395 1, 1, 0, 0, 0, 1, 1 \
396 }
397
398 /* General registers are fixed and therefore "historically" marked
399 call-used. (FIXME: This has changed). Registers $15..$31 are
400 call-clobbered; we'll put arguments in $16 and up, and we need $15 for
401 the MMIX register-stack "hole". */
402 #define CALL_USED_REGISTERS \
403 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, \
404 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
405 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
406 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
407 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
408 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
409 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
410 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
411 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
412 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
413 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
414 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
415 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
416 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
417 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
418 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, \
419 1, 1, 1, 1, 1, 1, 1 \
420 }
421
422 #define CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage ()
423
424 /* No INCOMING_REGNO or OUTGOING_REGNO, since those macros are not usable
425 for MMIX: it doesn't have a fixed register window size. FIXME: Perhaps
426 we should say something about $0..$15 may sometimes be the incoming
427 $16..$31. Those macros need better documentation; it looks like
428 they're just bogus and that FUNCTION_INCOMING_ARG_REGNO_P and
429 FUNCTION_OUTGOING_VALUE should be used where they're used. For the
430 moment, do nothing; things seem to work anyway. */
431
432 /* Defining LOCAL_REGNO is necessary in presence of prologue/epilogue,
433 else GCC will be confused that those registers aren't saved and
434 restored. */
435 #define LOCAL_REGNO(REGNO) mmix_local_regno (REGNO)
436
437 /* Node: Allocation Order */
438
439 /* We should allocate registers from 0 to 31 by increasing number, because
440 I think that's what people expect. Beyond that, just use
441 call-clobbered global registers first, then call-clobbered special
442 registers. Last, the fixed registers. */
443 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER \
444 { 0, 1, 2, 3, 4, 5, 6, 7, \
445 8, 9, 10, 11, 12, 13, 14, 15, \
446 16, 17, 18, 19, 20, 21, 22, 23, \
447 24, 25, 26, 27, 28, 29, 30, 31, \
448 \
449 252, 251, 250, 249, 248, 247, \
450 \
451 253, \
452 \
453 258, 260, 259, \
454 \
455 32, 33, 34, 35, 36, 37, 38, 39, \
456 40, 41, 42, 43, 44, 45, 46, 47, \
457 48, 49, 50, 51, 52, 53, 54, 55, \
458 56, 57, 58, 59, 60, 61, 62, 63, \
459 64, 65, 66, 67, 68, 69, 70, 71, \
460 72, 73, 74, 75, 76, 77, 78, 79, \
461 80, 81, 82, 83, 84, 85, 86, 87, \
462 88, 89, 90, 91, 92, 93, 94, 95, \
463 96, 97, 98, 99, 100, 101, 102, 103, \
464 104, 105, 106, 107, 108, 109, 110, 111, \
465 112, 113, 114, 115, 116, 117, 118, 119, \
466 120, 121, 122, 123, 124, 125, 126, 127, \
467 128, 129, 130, 131, 132, 133, 134, 135, \
468 136, 137, 138, 139, 140, 141, 142, 143, \
469 144, 145, 146, 147, 148, 149, 150, 151, \
470 152, 153, 154, 155, 156, 157, 158, 159, \
471 160, 161, 162, 163, 164, 165, 166, 167, \
472 168, 169, 170, 171, 172, 173, 174, 175, \
473 176, 177, 178, 179, 180, 181, 182, 183, \
474 184, 185, 186, 187, 188, 189, 190, 191, \
475 192, 193, 194, 195, 196, 197, 198, 199, \
476 200, 201, 202, 203, 204, 205, 206, 207, \
477 208, 209, 210, 211, 212, 213, 214, 215, \
478 216, 217, 218, 219, 220, 221, 222, 223, \
479 224, 225, 226, 227, 228, 229, 230, 231, \
480 232, 233, 234, 235, 236, 237, 238, 239, \
481 240, 241, 242, 243, 244, 245, 246, \
482 \
483 254, 255, 256, 257, 261, 262 \
484 }
485
486 /* As a convenience, we put this nearby, for ease of comparison.
487 First, call-clobbered registers in reverse order of assignment as
488 parameters (also the top ones; not because they're parameters, but
489 for continuity).
490
491 Second, saved registers that go on the register-stack.
492
493 Third, special registers rH, rR and rJ. They should not normally be
494 allocated, but since they're call-clobbered, it is cheaper to use one
495 of them than using a call-saved register for a call-clobbered use,
496 assuming it is referenced a very limited number of times. Other global
497 and fixed registers come next; they are never allocated. */
498 #define MMIX_GNU_ABI_REG_ALLOC_ORDER \
499 { 252, 251, 250, 249, 248, 247, 246, \
500 245, 244, 243, 242, 241, 240, 239, 238, \
501 237, 236, 235, 234, 233, 232, 231, \
502 \
503 0, 1, 2, 3, 4, 5, 6, 7, \
504 8, 9, 10, 11, 12, 13, 14, 15, \
505 16, 17, 18, 19, 20, 21, 22, 23, \
506 24, 25, 26, 27, 28, 29, 30, 31, \
507 \
508 253, \
509 \
510 258, 260, 259, \
511 \
512 32, 33, 34, 35, 36, 37, 38, 39, \
513 40, 41, 42, 43, 44, 45, 46, 47, \
514 48, 49, 50, 51, 52, 53, 54, 55, \
515 56, 57, 58, 59, 60, 61, 62, 63, \
516 64, 65, 66, 67, 68, 69, 70, 71, \
517 72, 73, 74, 75, 76, 77, 78, 79, \
518 80, 81, 82, 83, 84, 85, 86, 87, \
519 88, 89, 90, 91, 92, 93, 94, 95, \
520 96, 97, 98, 99, 100, 101, 102, 103, \
521 104, 105, 106, 107, 108, 109, 110, 111, \
522 112, 113, 114, 115, 116, 117, 118, 119, \
523 120, 121, 122, 123, 124, 125, 126, 127, \
524 128, 129, 130, 131, 132, 133, 134, 135, \
525 136, 137, 138, 139, 140, 141, 142, 143, \
526 144, 145, 146, 147, 148, 149, 150, 151, \
527 152, 153, 154, 155, 156, 157, 158, 159, \
528 160, 161, 162, 163, 164, 165, 166, 167, \
529 168, 169, 170, 171, 172, 173, 174, 175, \
530 176, 177, 178, 179, 180, 181, 182, 183, \
531 184, 185, 186, 187, 188, 189, 190, 191, \
532 192, 193, 194, 195, 196, 197, 198, 199, \
533 200, 201, 202, 203, 204, 205, 206, 207, \
534 208, 209, 210, 211, 212, 213, 214, 215, \
535 216, 217, 218, 219, 220, 221, 222, 223, \
536 224, 225, 226, 227, 228, 229, 230, \
537 \
538 254, 255, 256, 257, 261, 262 \
539 }
540
541 /* The default one. */
542 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
543
544 /* Node: Values in Registers */
545
546 #define HARD_REGNO_NREGS(REGNO, MODE) \
547 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) \
548 / UNITS_PER_WORD)
549
550 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
551
552 /* Note that no register can really be accessed in single-float mode, so
553 we *can* say 1 here. FIXME: Will TRT happen for single-float, or do
554 we have to punt to libgcc1.asm? */
555 #define MODES_TIEABLE_P(MODE1, MODE2) 1
556
557
558 /* Node: Leaf Functions */
559 /* (empty) */
560
561
562 /* Node: Register Classes */
563
564 enum reg_class
565 {
566 NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
567 SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
568 };
569
570 #define N_REG_CLASSES (int) LIM_REG_CLASSES
571
572 #define REG_CLASS_NAMES \
573 {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG", \
574 "SYSTEM_REGS", "ALL_REGS"}
575
576 /* Note that the contents of each item is always 32 bits. */
577 #define REG_CLASS_CONTENTS \
578 {{0, 0, 0, 0, 0, 0, 0, 0, 0}, \
579 {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20}, \
580 {0, 0, 0, 0, 0, 0, 0, 0, 0x10}, \
581 {0, 0, 0, 0, 0, 0, 0, 0, 4}, \
582 {0, 0, 0, 0, 0, 0, 0, 0, 0x7f}, \
583 {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x7f}}
584
585 #define REGNO_REG_CLASS(REGNO) \
586 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER \
587 || (REGNO) == MMIX_ARG_POINTER_REGNUM \
588 ? GENERAL_REGS \
589 : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG \
590 : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
591
592 #define BASE_REG_CLASS GENERAL_REGS
593
594 #define INDEX_REG_CLASS GENERAL_REGS
595
596 #define REG_CLASS_FROM_LETTER(CHAR) \
597 ((CHAR) == 'x' ? SYSTEM_REGS \
598 : (CHAR) == 'y' ? REMAINDER_REG \
599 : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
600
601 #define REGNO_OK_FOR_BASE_P(REGNO) \
602 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER \
603 || (REGNO) == MMIX_ARG_POINTER_REGNUM \
604 || (reg_renumber[REGNO] > 0 \
605 && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
606
607 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
608
609 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
610 mmix_preferred_reload_class (X, CLASS)
611
612 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
613 mmix_preferred_output_reload_class (X, CLASS)
614
615 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
616 mmix_secondary_reload_class (CLASS, MODE, X, 1)
617
618 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
619 mmix_secondary_reload_class (CLASS, MODE, X, 0)
620
621 #define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
622
623 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
624 mmix_const_ok_for_letter_p (VALUE, C)
625
626 #define EXTRA_CONSTRAINT(VALUE, C) \
627 mmix_extra_constraint (VALUE, C, MMIX_REG_OK_STRICT)
628
629 /* Do we need anything serious here? Yes, any FLOT constant. */
630 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) \
631 mmix_const_double_ok_for_letter_p (VALUE, C)
632
633
634 /* Node: Frame Layout */
635
636 #define STACK_GROWS_DOWNWARD
637 #define FRAME_GROWS_DOWNWARD
638
639 #define STARTING_FRAME_OFFSET \
640 mmix_starting_frame_offset ()
641
642 #define FIRST_PARM_OFFSET(FUNDECL) 0
643
644 #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
645 mmix_dynamic_chain_address (FRAMEADDR)
646
647 /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented. */
648
649 #define SETUP_FRAME_ADDRESSES() \
650 mmix_setup_frame_addresses ()
651
652 #define RETURN_ADDR_RTX(COUNT, FRAME) \
653 mmix_return_addr_rtx (COUNT, FRAME)
654
655 /* It's in rJ before we store it somewhere. */
656 #define INCOMING_RETURN_ADDR_RTX \
657 gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
658
659 /* FIXME: This does not seem properly documented or cross-indexed.
660 Nowhere except in the code does it say it *has* to be in the range
661 0..255, or else it will be truncated. That goes for the default too. */
662 #define DWARF_FRAME_RETURN_COLUMN \
663 DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
664
665 /* No return address is stored there. */
666 #define INCOMING_FRAME_SP_OFFSET 0
667
668 /* Node: Stack Checking */
669 /* (empty) */
670
671
672 /* Node: Exception Handling */
673
674 #define EH_RETURN_DATA_REGNO(N) \
675 mmix_eh_return_data_regno (N)
676
677 #define EH_RETURN_STACKADJ_RTX \
678 mmix_eh_return_stackadj_rtx ()
679
680 #define EH_RETURN_HANDLER_RTX \
681 mmix_eh_return_handler_rtx ()
682
683 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
684 mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
685
686 /* Node: Frame Registers */
687 #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
688
689 /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
690 what register we want to use. */
691 #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
692 #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
693
694 #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
695
696
697 /* Node: Elimination */
698 /* FIXME: Is this requirement built-in? Anyway, we should try to get rid
699 of it; we can deduce the value. */
700 #define FRAME_POINTER_REQUIRED (nonlocal_goto_stack_level != NULL_RTX)
701
702 /* The frame-pointer is stored in a location that either counts to the
703 offset of incoming parameters, or that counts to the offset of the
704 frame, so we can't use a single offset. We therefore eliminate those
705 two separately. */
706 #define ELIMINABLE_REGS \
707 {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
708 {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \
709 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
710
711 /* We need not worry about when the frame-pointer is required for other
712 reasons; GCC takes care of those cases. */
713 #define CAN_ELIMINATE(FROM, TO) 1
714
715 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
716 (OFFSET) = mmix_initial_elimination_offset (FROM, TO)
717
718
719 /* Node: Stack Arguments */
720
721 #define ACCUMULATE_OUTGOING_ARGS 1
722
723 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
724
725
726 /* Node: Register Arguments */
727 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
728 mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 0)
729
730 #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED) \
731 mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 1)
732
733 #define FUNCTION_ARG_PASS_BY_REFERENCE(CUM, MODE, TYPE, NAMED) \
734 mmix_function_arg_pass_by_reference (&(CUM), MODE, TYPE, NAMED)
735
736 /* This *sounds* good, but does not seem to be implemented correctly to
737 be a win; at least it wasn't in 2.7.2. FIXME: Check and perhaps
738 replace with a big comment. */
739 #define FUNCTION_ARG_CALLEE_COPIES(CUM, MODE, TYPE, NAMED) 1
740
741 typedef struct { int regs; int lib; } CUMULATIVE_ARGS;
742
743 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT) \
744 ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0))
745
746 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
747 ((CUM).regs \
748 = ((MUST_PASS_IN_STACK (MODE, TYPE)) \
749 || (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE) > 8 \
750 && !TARGET_LIBFUNC && !(CUM).lib)) \
751 ? (MMIX_MAX_ARGS_IN_REGS) + 1 \
752 : (CUM).regs + (7 + (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE))) / 8)
753
754 #define FUNCTION_ARG_REGNO_P(REGNO) \
755 mmix_function_arg_regno_p (REGNO, 0)
756
757 #define FUNCTION_INCOMING_ARG_REGNO_P(REGNO) \
758 mmix_function_arg_regno_p (REGNO, 1)
759
760
761 /* Node: Register Arguments */
762
763 #define FUNCTION_VALUE(VALTYPE, FUNC) \
764 gen_rtx_REG (TYPE_MODE (VALTYPE), MMIX_RETURN_VALUE_REGNUM)
765
766 /* This needs to take care of the register hole for complex return values. */
767 #define FUNCTION_OUTGOING_VALUE(VALTYPE, FUNC) \
768 mmix_function_outgoing_value (VALTYPE, FUNC)
769
770 #define LIBCALL_VALUE(MODE) \
771 gen_rtx_REG (MODE, MMIX_OUTGOING_RETURN_VALUE_REGNUM)
772
773 #define FUNCTION_VALUE_REGNO_P(REGNO) \
774 ((REGNO) == MMIX_OUTGOING_RETURN_VALUE_REGNUM)
775
776
777 /* Node: Aggregate Return */
778
779 #define STRUCT_VALUE_REGNUM MMIX_STRUCT_VALUE_REGNUM
780
781
782 /* Node: Caller Saves */
783 /* (empty) */
784
785
786 /* Node: Function Entry */
787
788 /* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
789 TARGET_ASM_FUNCTION_EPILOGUE. */
790
791 /* We need to say that the epilogue uses the return address, so the
792 initial-value machinery restores it. FIXME: Some targets
793 conditionalize on "reload_completed &&". Investigate difference.
794 FIXME: Not needed if nonlocal_goto_stack_level. */
795 #define EPILOGUE_USES(REGNO) \
796 ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
797
798 #define TARGET_ASM_OUTPUT_MI_THUNK mmix_asm_output_mi_thunk
799
800
801 /* Node: Profiling */
802 #define FUNCTION_PROFILER(FILE, LABELNO) \
803 mmix_function_profiler (FILE, LABELNO)
804
805 /* Node: Varargs */
806
807 /* For the moment, let's stick to pushing argument registers on the stack.
808 Later, we can parse all arguments in registers, to improve
809 performance. */
810 #define SETUP_INCOMING_VARARGS(A, M, T, P, S) \
811 mmix_setup_incoming_varargs(&(A), M, T, &(P), S)
812
813 /* FIXME: This and other EXPAND_BUILTIN_VA_... target macros are not
814 documented, although used by several targets. */
815 #define EXPAND_BUILTIN_VA_ARG(VALIST, TYPE) \
816 mmix_expand_builtin_va_arg (VALIST, TYPE)
817
818 /* Node: Trampolines */
819
820 #define TRAMPOLINE_TEMPLATE(FILE) \
821 mmix_trampoline_template (FILE)
822
823 #define TRAMPOLINE_SIZE mmix_trampoline_size
824 #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, STATIC_CHAIN) \
825 mmix_initialize_trampoline (ADDR, FNADDR, STATIC_CHAIN)
826
827
828 /* Node: Library Calls */
829
830 #define TARGET_MEM_FUNCTIONS
831
832
833 /* Node: Addressing Modes */
834
835 #define CONSTANT_ADDRESS_P(X) \
836 mmix_constant_address_p (X)
837
838 #define MAX_REGS_PER_ADDRESS 2
839
840 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL) \
841 if (mmix_legitimate_address (MODE, X, MMIX_REG_OK_STRICT)) \
842 goto LABEL
843
844 #ifndef REG_OK_STRICT
845 # define REG_OK_FOR_BASE_P(X) \
846 (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \
847 || REGNO (X) == MMIX_ARG_POINTER_REGNUM \
848 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
849 #else
850 # define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
851 #endif /* REG_OK_STRICT */
852
853 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
854
855 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
856
857 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL)
858
859 #define LEGITIMATE_CONSTANT_P(X) \
860 mmix_legitimate_constant_p (X)
861
862
863 /* Node: Condition Code */
864
865 #define SELECT_CC_MODE(OP, X, Y) \
866 mmix_select_cc_mode (OP, X, Y)
867
868 /* A definition of CANONICALIZE_COMPARISON that changed LE and GT
869 comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU
870 comparisons with 256 to 255 and LE, LEU, GT and GTU has been
871 ineffective; the code path for performing the changes did not trig for
872 neither the GCC test-suite nor ghostscript-6.52 nor Knuth's mmix.tar.gz
873 itself (core GCC functionality supposedly handling it) with sources
874 from 2002-06-06. */
875
876 #define REVERSIBLE_CC_MODE(MODE) \
877 mmix_reversible_cc_mode (MODE)
878
879
880 /* Node: Costs */
881
882 /* This one takes on both the RTX_COSTS and CONST_COSTS tasks. */
883 #define DEFAULT_RTX_COSTS(X, CODE, OUTER_CODE) \
884 { \
885 int mmix_rtx_cost; \
886 if (mmix_rtx_cost_recalculated (X, CODE, OUTER_CODE, \
887 &mmix_rtx_cost)) \
888 return mmix_rtx_cost; \
889 }
890
891 #define ADDRESS_COST(ADDRESS) mmix_address_cost (ADDRESS)
892
893 /* The special registers can only move to and from general regs, and we
894 need to check that their constraints match, so say 3 for them. */
895 /* WARNING: gcc-2.7.2.2 i686-pc-linux-gnulibc1 (as shipped with RH 4.2)
896 miscompiles reload1.c:reload_cse_simplify_set; a call to
897 reload_cse_regno_equal_p is missing when checking if a substitution of
898 a register setting is valid if this is defined to just the expression
899 in mmix_register_move_cost.
900
901 Symptom: a (all?) register setting is optimized away for e.g.
902 "char *p1(char *p) { return p+1; }" and the value of register zero ($0)
903 is returned.
904
905 We can workaround by making this a function call - unknown if this
906 causes dire speed effects. */
907 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
908 mmix_register_move_cost (MODE, FROM, TO)
909
910 #define SLOW_BYTE_ACCESS 0
911
912
913 /* Node: Sections */
914
915 /* This must be a constant string, since it's used in crtstuff.c. */
916 #define TEXT_SECTION_ASM_OP \
917 "\t.text ! mmixal:= 9H LOC 8B"
918
919 /* FIXME: Not documented. */
920 #define DATA_SECTION_ASM_OP \
921 mmix_data_section_asm_op ()
922
923 #define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata"
924
925 /* Node: PIC */
926 /* (empty) */
927
928
929 /* Node: File Framework */
930
931 #define ASM_FILE_START(STREAM) \
932 mmix_asm_file_start (STREAM)
933
934 #define ASM_FILE_END(STREAM) \
935 mmix_asm_file_end (STREAM)
936
937 /* While any other punctuation character but ";" would do, we prefer "%"
938 or "!"; "!" is an unary operator and so will not be mistakenly included
939 in correctly formed expressions. The hash character adds mass; catches
940 the eye. We can't have it as a comment char by itself, since it's a
941 hex-number prefix. */
942 #define ASM_COMMENT_START "!#"
943
944 /* These aren't currently functional. We just keep them as markers. */
945 #define ASM_APP_ON "%APP\n"
946 #define ASM_APP_OFF "%NO_APP\n"
947
948 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
949 mmix_asm_output_source_filename (STREAM, NAME)
950
951 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
952 mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
953
954 #define ASM_OUTPUT_SOURCE_LINE(STREAM, LINE) \
955 mmix_asm_output_source_line (STREAM, LINE)
956
957 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
958
959
960 /* Node: Data Output */
961
962 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
963 mmix_asm_output_ascii (STREAM, PTR, LEN)
964
965 /* Node: Uninitialized Data */
966
967 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
968 mmix_asm_output_aligned_common (ST, N, S, A)
969
970 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
971 mmix_asm_output_aligned_local (ST, N, S, A)
972
973
974 /* Node: Label Output */
975
976 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
977 mmix_asm_output_label (STREAM, NAME)
978
979 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
980 mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
981
982 #define GLOBAL_ASM_OP "\t.global "
983
984 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
985 mmix_asm_weaken_label (STREAM, NAME)
986
987 #define MAKE_DECL_ONE_ONLY(DECL) \
988 mmix_make_decl_one_only (DECL)
989
990 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
991 mmix_asm_output_labelref (STREAM, NAME)
992
993 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, PREFIX, NUM) \
994 mmix_asm_output_internal_label (STREAM, PREFIX, NUM)
995
996 /* We insert a ":" to disambiguate against user symbols like L5. */
997 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
998 sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
999
1000 /* Insert "::"; these are rarer than internal labels. FIXME: Make sure no
1001 ":" is seen in the object file; we don't really want that mmixal
1002 feature visible there. We don't want the default, which uses a dot;
1003 that'd be incompatible with mmixal. */
1004 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
1005 ((OUTPUT) = (char *) alloca (strlen ((NAME)) + 2 + 10), \
1006 sprintf ((OUTPUT), "%s::%d", (NAME), (LABELNO)))
1007
1008 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
1009 mmix_asm_output_def (STREAM, NAME, VALUE)
1010
1011 /* Node: Macros for Initialization */
1012 /* We're compiling to ELF and linking to MMO; fundamental ELF features
1013 that GCC depend on are there. */
1014
1015 /* These must be constant strings, since they're used in crtstuff.c. */
1016 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
1017
1018 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
1019
1020 #define OBJECT_FORMAT_ELF
1021
1022
1023 /* Node: Instruction Output */
1024
1025 /* The non-$ register names must be prefixed with ":", since they're
1026 affected by PREFIX. We provide the non-colon names as additional
1027 names. */
1028 #define REGISTER_NAMES \
1029 {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7", \
1030 "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", \
1031 "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23", \
1032 "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31", \
1033 "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39", \
1034 "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47", \
1035 "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55", \
1036 "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63", \
1037 "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71", \
1038 "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79", \
1039 "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87", \
1040 "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95", \
1041 "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103", \
1042 "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111", \
1043 "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119", \
1044 "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127", \
1045 "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135", \
1046 "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143", \
1047 "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151", \
1048 "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159", \
1049 "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167", \
1050 "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175", \
1051 "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183", \
1052 "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191", \
1053 "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199", \
1054 "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207", \
1055 "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215", \
1056 "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223", \
1057 "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231", \
1058 "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239", \
1059 "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247", \
1060 "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255", \
1061 ":rD", ":rE", ":rH", ":rJ", ":rR", "ap_!BAD!", ":rO"}
1062
1063 #define ADDITIONAL_REGISTER_NAMES \
1064 {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257}, \
1065 {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}, {"rO", MMIX_rO_REGNUM}}
1066
1067 #define PRINT_OPERAND(STREAM, X, CODE) \
1068 mmix_print_operand (STREAM, X, CODE)
1069
1070 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
1071 mmix_print_operand_punct_valid_p (CODE)
1072
1073 #define PRINT_OPERAND_ADDRESS(STREAM, X) \
1074 mmix_print_operand_address (STREAM, X)
1075
1076 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
1077 mmix_asm_output_reg_push (STREAM, REGNO)
1078
1079 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
1080 mmix_asm_output_reg_pop (STREAM, REGNO)
1081
1082
1083 /* Node: Dispatch Tables */
1084
1085 /* We define both types, since SImode is the better, but DImode the only
1086 possible for mmixal so that's the one actually used. */
1087 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
1088 mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
1089
1090 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
1091 mmix_asm_output_addr_vec_elt (STREAM, VALUE)
1092
1093
1094 /* Node: Exception Region Output */
1095 /* (empty) */
1096
1097 /* Node: Alignment Output */
1098
1099 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
1100 mmix_asm_output_skip (STREAM, NBYTES)
1101
1102 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
1103 mmix_asm_output_align (STREAM, POWER)
1104
1105
1106 /* Node: All Debuggers */
1107
1108 #define DBX_REGISTER_NUMBER(REGNO) \
1109 mmix_dbx_register_number (REGNO)
1110
1111
1112 /* Node: DBX Options */
1113 /* (empty) */
1114 /* Node: DBX Hooks */
1115 /* (empty) */
1116 /* Node: File Names and DBX */
1117 /* (empty) */
1118
1119
1120 /* Node: SDB and DWARF */
1121 #define DWARF2_DEBUGGING_INFO 1
1122 #define DWARF2_ASM_LINE_DEBUG_INFO 1
1123
1124 /* Node: Misc */
1125
1126 #define PREDICATE_CODES \
1127 {"mmix_reg_cc_operand", {SUBREG, REG}}, \
1128 {"mmix_foldable_comparison_operator", \
1129 {NE, EQ, GE, GT, LE, LT}}, \
1130 /* All '<', actually. */ \
1131 {"mmix_comparison_operator", \
1132 {NE, EQ, GE, GT, LE, LT, GEU, GTU, LEU, \
1133 LTU, UNORDERED, ORDERED, UNEQ, UNGE, UNLE, \
1134 UNLT, LTGT}}, \
1135 {"mmix_symbolic_or_address_operand", \
1136 {SYMBOL_REF, LABEL_REF, CONST, \
1137 SUBREG, REG, PLUS}}, \
1138 {"mmix_reg_or_constant_operand", \
1139 {CONST_INT, CONST_DOUBLE, SUBREG, REG}}, \
1140 {"mmix_reg_or_8bit_operand", \
1141 {CONST_INT, CONST_DOUBLE, SUBREG, REG}}, \
1142 {"mmix_reg_or_0_operand", \
1143 {CONST_INT, CONST_DOUBLE, SUBREG, REG}},
1144
1145 #define SPECIAL_MODE_PREDICATES "mmix_symbolic_or_address_operand",
1146
1147 /* There's no way to get a PC-relative offset into tables for SImode, so
1148 for the moment we have absolute entries in DImode.
1149 When we're going ELF, these should be SImode and 1. */
1150 #define CASE_VECTOR_MODE DImode
1151 #define CASE_VECTOR_PC_RELATIVE 0
1152
1153 #define WORD_REGISTER_OPERATIONS
1154
1155 /* We have a choice, which makes this yet another parameter to tweak. The
1156 gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
1157 than "unsigned int", and we have signed characters. FIXME: measure. */
1158 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
1159
1160 #define MOVE_MAX 8
1161
1162 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1163
1164 /* We have a choice here too. */
1165 #if 0
1166 /* FIXME: Revisit, we don't have scc expanders yet. */
1167 #define STORE_FLAG_VALUE 1
1168 #endif
1169
1170 #define Pmode DImode
1171
1172 #define FUNCTION_MODE QImode
1173
1174 #define NO_IMPLICIT_EXTERN_C
1175
1176 #define HANDLE_SYSV_PRAGMA
1177
1178 /* These are checked. */
1179 #define DOLLARS_IN_IDENTIFIERS 0
1180 #define NO_DOLLAR_IN_LABEL
1181 #define NO_DOT_IN_LABEL
1182
1183 /* Calculate the highest used supposed saved stack register. */
1184 #define MACHINE_DEPENDENT_REORG(INSN) \
1185 mmix_machine_dependent_reorg (INSN)
1186
1187 #endif /* GCC_MMIX_H */
1188 /*
1189 * Local variables:
1190 * eval: (c-set-style "gnu")
1191 * indent-tabs-mode: t
1192 * End:
1193 */