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)
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
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
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 260
51 #define MMIX_ARG_POINTER_REGNUM 261
52 #define MMIX_LAST_REGISTER_FILE_REGNUM 31
54 /* Four registers; "ideally, these registers should be call-clobbered", so
55 just grab a bunch of the common clobbered registers. FIXME: Last
56 registers of return-value should be used, with an error if there's a
57 return-value (that collides in size). */
58 #define MMIX_EH_RETURN_DATA_REGNO_START (MMIX_STRUCT_VALUE_REGNUM - 4)
60 /* Try to keep the definitions from running away on their own. */
61 #if (MMIX_EH_RETURN_DATA_REGNO_START \
62 != MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS)
63 #error MMIX register definition inconsistency
66 #if (MMIX_MAX_REGS_FOR_VALUE + MMIX_MAX_ARGS_IN_REGS > 32)
67 #error MMIX parameters and return values bad, more than 32 registers
70 /* This chosen as "a call-clobbered hard register that is otherwise
71 untouched by the epilogue". */
72 #define MMIX_EH_RETURN_STACKADJ_REGNUM MMIX_STATIC_CHAIN_REGNUM
75 # define MMIX_REG_OK_STRICT 1
77 # define MMIX_REG_OK_STRICT 0
80 #define MMIX_FUNCTION_ARG_SIZE(MODE, TYPE) \
81 ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) : int_size_in_bytes (TYPE))
83 /* Declarations for helper variables that are not tied to a particular
85 extern struct rtx_def *mmix_compare_op0;
86 extern struct rtx_def *mmix_compare_op1;
88 /* Per-function machine data. This is normally an opaque type just
89 defined and used in the tm.c file, but we need to see the definition in
91 struct machine_function
96 /* For these target macros, there is no generic documentation here. You
97 should read `Using and Porting GCC' for that. Only comments specific
98 to the MMIX target are here.
100 There are however references to the specific texinfo node (comments
101 with "Node:"), so there should be little or nothing amiss. Probably
102 the opposite, since we don't have to care about old littering and
103 soon outdated generic comments. */
107 /* When both ABI:s work, this is how we tell them apart in code. The
108 GNU abi is implied the default. Also implied in TARGET_DEFAULT. */
110 "%{mabi=gnu:-D__MMIX_ABI_GNU__\
112 %eoptions -mabi=mmixware and -mabi=gnu are mutually exclusive}}\
113 %{!mabi=gnu:-D__MMIX_ABI_MMIXWARE__}"
115 /* User symbols are in the same name-space as built-in symbols, but we
116 don't need the built-in symbols, so remove those and instead apply
117 stricter operand checking. Don't warn when expanding insns. */
118 #define ASM_SPEC "-no-predefined-syms -x"
120 /* Pass on -mset-program-start=N and -mset-data-start=M to the linker.
121 Provide default program start 0x100 unless -mno-set-program-start.
122 Link to ELF if requested. */
124 "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\
125 %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\
126 %{!mset-program-start=*:\
127 %{!mno-set-program-start:--defsym __.MMIX.start..text=0x100}}\
128 %{!melf:-m mmo}%{melf:-m elf64mmix}"
130 /* Put unused option values here. */
131 extern const char *mmix_cc1_ignored_option;
133 #define TARGET_OPTIONS \
134 {{"set-program-start=", &mmix_cc1_ignored_option, \
135 N_("Set start-address of the program") }, \
136 {"set-data-start=", &mmix_cc1_ignored_option, \
137 N_("Set start-address of data")}}
139 /* FIXME: There's no provision for profiling here. */
140 #define STARTFILE_SPEC \
141 "crti%O%s crtbegin%O%s"
143 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
145 /* Node: Run-time Target */
147 /* Define __LONG_MAX__, since we're advised not to change glimits.h. */
148 #define CPP_PREDEFINES "-D__mmix__ -D__MMIX__ -D__LONG_MAX__=9223372036854775807L"
150 extern int target_flags;
152 #define TARGET_MASK_LIBFUNCS 1
153 #define TARGET_MASK_ABI_GNU 2
154 #define TARGET_MASK_FCMP_EPSILON 4
155 #define TARGET_MASK_ZERO_EXTEND 8
156 #define TARGET_MASK_KNUTH_DIVISION 16
157 #define TARGET_MASK_TOPLEVEL_SYMBOLS 32
158 #define TARGET_MASK_BRANCH_PREDICT 64
160 /* We use the term "base address" since that's what Knuth uses. The base
161 address goes in a global register. When addressing, it's more like
162 "base address plus offset", with the offset being 0..255 from the base,
163 which itself can be a symbol plus an offset. The effect is like having
164 a constant pool in global registers, code offseting from those
165 registers (automatically causing a request for a suitable constant base
166 address register) without having to know the specific register or the
168 #define TARGET_MASK_BASE_ADDRESSES 128
170 /* FIXME: Get rid of this one. */
171 #define TARGET_LIBFUNC (target_flags & TARGET_MASK_LIBFUNCS)
172 #define TARGET_ABI_GNU (target_flags & TARGET_MASK_ABI_GNU)
173 #define TARGET_FCMP_EPSILON (target_flags & TARGET_MASK_FCMP_EPSILON)
174 #define TARGET_ZERO_EXTEND (target_flags & TARGET_MASK_ZERO_EXTEND)
175 #define TARGET_KNUTH_DIVISION (target_flags & TARGET_MASK_KNUTH_DIVISION)
176 #define TARGET_TOPLEVEL_SYMBOLS (target_flags & TARGET_MASK_TOPLEVEL_SYMBOLS)
177 #define TARGET_BRANCH_PREDICT (target_flags & TARGET_MASK_BRANCH_PREDICT)
178 #define TARGET_BASE_ADDRESSES (target_flags & TARGET_MASK_BASE_ADDRESSES)
180 #define TARGET_DEFAULT \
181 (TARGET_MASK_BRANCH_PREDICT | TARGET_MASK_BASE_ADDRESSES)
183 /* FIXME: Provide a way to *load* the epsilon register. */
184 #define TARGET_SWITCHES \
185 {{"libfuncs", TARGET_MASK_LIBFUNCS, \
186 N_("For intrinsics library: pass all parameters in registers")}, \
187 {"no-libfuncs", -TARGET_MASK_LIBFUNCS, ""}, \
188 {"abi=mmixware", -TARGET_MASK_ABI_GNU, \
189 N_("Use register stack for parameters and return value")}, \
190 {"abi=gnu", TARGET_MASK_ABI_GNU, \
191 N_("Use call-clobbered registers for parameters and return value")}, \
192 {"epsilon", TARGET_MASK_FCMP_EPSILON, \
193 N_("Use epsilon-respecting floating point compare instructions")}, \
194 {"no-epsilon", -TARGET_MASK_FCMP_EPSILON, ""}, \
195 {"zero-extend", TARGET_MASK_ZERO_EXTEND, \
196 N_("Use zero-extending memory loads, not sign-extending ones")}, \
197 {"no-zero-extend", -TARGET_MASK_ZERO_EXTEND, ""}, \
198 {"knuthdiv", TARGET_MASK_KNUTH_DIVISION, \
199 N_("Generate divide results with reminder having the same sign as the\
200 divisor (not the dividend)")}, \
201 {"no-knuthdiv", -TARGET_MASK_KNUTH_DIVISION, ""}, \
202 {"toplevel-symbols", TARGET_MASK_TOPLEVEL_SYMBOLS, \
203 N_("Prepend global symbols with \":\" (for use with PREFIX)")}, \
204 {"no-toplevel-symbols", -TARGET_MASK_TOPLEVEL_SYMBOLS, \
205 N_("Do not provide a default start-address 0x100 of the program")}, \
207 N_("Link to emit program in ELF format (rather than mmo)")}, \
208 {"branch-predict", TARGET_MASK_BRANCH_PREDICT, \
209 N_("Use P-mnemonics for branches statically predicted as taken")}, \
210 {"no-branch-predict", -TARGET_MASK_BRANCH_PREDICT, \
211 N_("Don't use P-mnemonics for branches")}, \
212 {"base-addresses", TARGET_MASK_BASE_ADDRESSES, \
213 N_("Use addresses that allocate global registers")}, \
214 {"no-base-addresses", -TARGET_MASK_BASE_ADDRESSES, \
215 N_("Do not use addresses that allocate global registers")}, \
216 {"", TARGET_DEFAULT, ""}}
218 /* Unfortunately, this must not reference anything in "mmix.c". */
219 #define TARGET_VERSION \
220 fprintf (stderr, " (MMIX)")
222 #define OVERRIDE_OPTIONS mmix_override_options ()
224 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE) \
228 flag_regmove = TRUE; \
230 if (SIZE || LEVEL > 1) \
232 flag_omit_frame_pointer = TRUE; \
233 flag_strength_reduce = FALSE; \
238 /* This one will have to wait a little bit; right now we can't debug
239 neither with or without a frame-pointer. */
240 /* #define CAN_DEBUG_WITHOUT_FP */
243 /* Node: Per-Function Data */
244 #define INIT_EXPANDERS mmix_init_expanders ()
247 /* Node: Storage Layout */
248 /* I see no bitfield instructions. Anyway, the common order is from low
249 to high, as the power of two, hence little-endian. */
250 #define BITS_BIG_ENDIAN 0
251 #define BYTES_BIG_ENDIAN 1
252 #define WORDS_BIG_ENDIAN 1
253 #define FLOAT_WORDS_BIG_ENDIAN 1
254 #define BITS_PER_WORD 64
255 #define UNITS_PER_WORD 8
256 #define POINTER_SIZE 64
258 /* FIXME: This macro is correlated to MAX_FIXED_MODE_SIZE in that
259 e.g. this macro must not be 8 (default, UNITS_PER_WORD) when
260 MAX_FIXED_MODE_SIZE is 64 (default, DImode), or really: this must be
261 set manually if MAX_FIXED_MODE_SIZE is not at least twice the register
262 size. By setting it to 4, we don't have to worry about TImode things
263 yet. Revisit, perhaps get TImode going or get some solution that does
264 not mandate TImode or lie in other ways. */
265 #define MIN_UNITS_PER_WORD 4
267 /* FIXME: Promotion of modes currently generates slow code, extending
268 before every operation. */
270 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE) \
272 if (GET_MODE_CLASS (MODE) == MODE_INT \
273 && GET_MODE_SIZE (MODE) < 8) \
276 /* Do the following some time later, \
277 scrutinizing differences. */ \
278 if (0) (UNSIGNEDP) = 0; \
282 #define PROMOTE_FUNCTION_ARGS
285 /* Apparently not doing TRT if int < register-size. FIXME: Perhaps
286 FUNCTION_VALUE and LIBCALL_VALUE needs tweaking as some ports say. */
287 #define PROMOTE_FUNCTION_RETURN
290 /* I'm a little bit undecided about this one. It might be beneficial to
291 promote all operations. */
292 #define PROMOTE_FOR_CALL_ONLY
294 /* We need to align everything to 64 bits that can affect the alignment
295 of other types. Since address N is interpreted in MMIX as (N modulo
296 access_size), we must align. */
297 #define PARM_BOUNDARY 64
298 #define STACK_BOUNDARY 64
299 #define FUNCTION_BOUNDARY 32
300 #define BIGGEST_ALIGNMENT 64
302 /* This one is only used in the ADA front end. */
303 #define MINIMUM_ATOMIC_ALIGNMENT 8
305 /* Copied from elfos.h. */
306 #define MAX_OFILE_ALIGNMENT (32768 * 8)
308 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
309 mmix_data_alignment (TYPE, BASIC_ALIGN)
311 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
312 mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
314 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
315 mmix_local_alignment (TYPE, BASIC_ALIGN)
317 /* Following other ports, this seems to most commonly be the word-size,
318 so let's do that here too. */
319 #define EMPTY_FIELD_BOUNDARY 64
321 /* We chose to have this low solely for similarity with the alpha. It has
322 nothing to do with passing the tests dg/c99-scope-2 and
323 execute/align-1.c. Nothing. Though the tests seem wrong. Padding of
324 the structure is automatically added to get alignment when needed if we
325 set this to just byte-boundary. */
326 #define STRUCTURE_SIZE_BOUNDARY 8
328 /* The lower bits are ignored. */
329 #define STRICT_ALIGNMENT 1
332 /* Node: Type Layout */
334 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
335 but then an occasional MMIX programmer needs to know how to put a lot
336 of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
337 than the "intuitive" char, short and int types. */
338 #define INT_TYPE_SIZE 32
339 #define SHORT_TYPE_SIZE 16
340 #define LONG_LONG_TYPE_SIZE 64
342 #define FLOAT_TYPE_SIZE 32
343 #define DOUBLE_TYPE_SIZE 64
344 #define LONG_DOUBLE_TYPE_SIZE 64
346 #define DEFAULT_SIGNED_CHAR 1
348 /* I have no rationale for this other than pointing at Alpha. */
349 #define WCHAR_TYPE "unsigned int"
350 #define WCHAR_TYPE_SIZE 32
353 /* Node: Register Basics */
354 /* We tell GCC about all 256 general registers, and we also include
355 rD, rE, rH, rJ and rR (in that order) so we can describe what insns
356 clobber them. We use a faked register for the argument pointer. It is
357 always eliminated towards the frame-pointer or the stack-pointer, never
358 output in assembly. Any fixed register would do for this, like $255,
359 but future debugging is easier when using a separate register. It
360 counts as a global register for pseudorandom reasons. */
361 #define FIRST_PSEUDO_REGISTER 262
363 /* We treat general registers with no assigned purpose as fixed. The
364 stack pointer, $254, is also fixed. Register $255 is referred to as a
365 temporary register in the MMIX papers, and used as such in mmixal, so
366 it should not be used as a stack pointer. We set it to fixed, and use
367 it "manually" at times of despair. */
368 #define FIXED_REGISTERS \
369 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
370 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
371 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
372 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
373 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
374 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
375 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
376 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
377 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
378 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
379 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
380 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
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, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
388 /* General registers are fixed and therefore "historically" marked
389 call-used. (FIXME: This has changed). Registers $15..$31 are
390 call-clobbered; we'll put arguments in $16 and up, and we need $15 for
391 the MMIX register-stack "hole". */
392 #define CALL_USED_REGISTERS \
393 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, \
394 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
395 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
396 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
397 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
398 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
399 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
400 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
401 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
402 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
403 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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, 0, 1, 1, \
412 #define CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage ()
414 /* No LOCAL_REGNO, INCOMING_REGNO or OUTGOING_REGNO, since those macros
415 are not usable for MMIX: it doesn't have a fixed register window size.
416 FIXME: Perhaps we should say something about $0..$15 may sometimes be
417 the incoming $16..$31. Those macros need better documentation; it
418 looks like they're just bogus and that FUNCTION_INCOMING_ARG_REGNO_P
419 and FUNCTION_OUTGOING_VALUE should be used where they're used. For the
420 moment, do nothing; things seem to work anyway. */
423 /* Node: Allocation Order */
425 /* We should allocate registers from 0 to 31 by increasing number, because
426 I think that's what people expect. Beyond that, just use
427 call-clobbered global registers first, then call-clobbered special
428 registers. Last, the fixed registers. */
429 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER \
430 { 0, 1, 2, 3, 4, 5, 6, 7, \
431 8, 9, 10, 11, 12, 13, 14, 15, \
432 16, 17, 18, 19, 20, 21, 22, 23, \
433 24, 25, 26, 27, 28, 29, 30, 31, \
435 252, 251, 250, 249, 248, 247, \
441 32, 33, 34, 35, 36, 37, 38, 39, \
442 40, 41, 42, 43, 44, 45, 46, 47, \
443 48, 49, 50, 51, 52, 53, 54, 55, \
444 56, 57, 58, 59, 60, 61, 62, 63, \
445 64, 65, 66, 67, 68, 69, 70, 71, \
446 72, 73, 74, 75, 76, 77, 78, 79, \
447 80, 81, 82, 83, 84, 85, 86, 87, \
448 88, 89, 90, 91, 92, 93, 94, 95, \
449 96, 97, 98, 99, 100, 101, 102, 103, \
450 104, 105, 106, 107, 108, 109, 110, 111, \
451 112, 113, 114, 115, 116, 117, 118, 119, \
452 120, 121, 122, 123, 124, 125, 126, 127, \
453 128, 129, 130, 131, 132, 133, 134, 135, \
454 136, 137, 138, 139, 140, 141, 142, 143, \
455 144, 145, 146, 147, 148, 149, 150, 151, \
456 152, 153, 154, 155, 156, 157, 158, 159, \
457 160, 161, 162, 163, 164, 165, 166, 167, \
458 168, 169, 170, 171, 172, 173, 174, 175, \
459 176, 177, 178, 179, 180, 181, 182, 183, \
460 184, 185, 186, 187, 188, 189, 190, 191, \
461 192, 193, 194, 195, 196, 197, 198, 199, \
462 200, 201, 202, 203, 204, 205, 206, 207, \
463 208, 209, 210, 211, 212, 213, 214, 215, \
464 216, 217, 218, 219, 220, 221, 222, 223, \
465 224, 225, 226, 227, 228, 229, 230, 231, \
466 232, 233, 234, 235, 236, 237, 238, 239, \
467 240, 241, 242, 243, 244, 245, 246, \
469 254, 255, 256, 257, 261 \
472 /* As a convenience, we put this nearby, for ease of comparison.
473 First, call-clobbered registers in reverse order of assignment as
474 parameters (also the top ones; not because they're parameters, but
477 Second, saved registers that go on the register-stack.
479 Third, special registers rH, rR and rJ. They should not normally be
480 allocated, but since they're call-clobbered, it is cheaper to use one
481 of them than using a call-saved register for a call-clobbered use,
482 assuming it is referenced a very limited number of times. Other global
483 and fixed registers come next; they are never allocated. */
484 #define MMIX_GNU_ABI_REG_ALLOC_ORDER \
485 { 252, 251, 250, 249, 248, 247, 246, \
486 245, 244, 243, 242, 241, 240, 239, 238, \
487 237, 236, 235, 234, 233, 232, 231, \
489 0, 1, 2, 3, 4, 5, 6, 7, \
490 8, 9, 10, 11, 12, 13, 14, 15, \
491 16, 17, 18, 19, 20, 21, 22, 23, \
492 24, 25, 26, 27, 28, 29, 30, 31, \
498 32, 33, 34, 35, 36, 37, 38, 39, \
499 40, 41, 42, 43, 44, 45, 46, 47, \
500 48, 49, 50, 51, 52, 53, 54, 55, \
501 56, 57, 58, 59, 60, 61, 62, 63, \
502 64, 65, 66, 67, 68, 69, 70, 71, \
503 72, 73, 74, 75, 76, 77, 78, 79, \
504 80, 81, 82, 83, 84, 85, 86, 87, \
505 88, 89, 90, 91, 92, 93, 94, 95, \
506 96, 97, 98, 99, 100, 101, 102, 103, \
507 104, 105, 106, 107, 108, 109, 110, 111, \
508 112, 113, 114, 115, 116, 117, 118, 119, \
509 120, 121, 122, 123, 124, 125, 126, 127, \
510 128, 129, 130, 131, 132, 133, 134, 135, \
511 136, 137, 138, 139, 140, 141, 142, 143, \
512 144, 145, 146, 147, 148, 149, 150, 151, \
513 152, 153, 154, 155, 156, 157, 158, 159, \
514 160, 161, 162, 163, 164, 165, 166, 167, \
515 168, 169, 170, 171, 172, 173, 174, 175, \
516 176, 177, 178, 179, 180, 181, 182, 183, \
517 184, 185, 186, 187, 188, 189, 190, 191, \
518 192, 193, 194, 195, 196, 197, 198, 199, \
519 200, 201, 202, 203, 204, 205, 206, 207, \
520 208, 209, 210, 211, 212, 213, 214, 215, \
521 216, 217, 218, 219, 220, 221, 222, 223, \
522 224, 225, 226, 227, 228, 229, 230, \
524 254, 255, 256, 257, 261 \
527 /* The default one. */
528 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
530 /* Node: Values in Registers */
532 #define HARD_REGNO_NREGS(REGNO, MODE) \
533 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) \
536 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
538 /* Note that no register can really be accessed in single-float mode, so
539 we *can* say 1 here. FIXME: Will TRT happen for single-float, or do
540 we have to punt to libgcc1.asm? */
541 #define MODES_TIEABLE_P(MODE1, MODE2) 1
544 /* Node: Leaf Functions */
548 /* Node: Register Classes */
552 NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
553 SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
556 #define N_REG_CLASSES (int) LIM_REG_CLASSES
558 #define REG_CLASS_NAMES \
559 {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG", \
560 "SYSTEM_REGS", "ALL_REGS"}
562 /* Note that the contents of each item is always 32 bits. */
563 #define REG_CLASS_CONTENTS \
564 {{0, 0, 0, 0, 0, 0, 0, 0, 0}, \
565 {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20}, \
566 {0, 0, 0, 0, 0, 0, 0, 0, 0x10}, \
567 {0, 0, 0, 0, 0, 0, 0, 0, 4}, \
568 {0, 0, 0, 0, 0, 0, 0, 0, 0x3f}, \
569 {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x3f}}
571 #define REGNO_REG_CLASS(REGNO) \
572 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER \
573 || (REGNO) == MMIX_ARG_POINTER_REGNUM \
575 : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG \
576 : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
578 #define BASE_REG_CLASS GENERAL_REGS
580 #define INDEX_REG_CLASS GENERAL_REGS
582 #define REG_CLASS_FROM_LETTER(CHAR) \
583 ((CHAR) == 'x' ? SYSTEM_REGS \
584 : (CHAR) == 'y' ? REMAINDER_REG \
585 : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
587 #define REGNO_OK_FOR_BASE_P(REGNO) \
588 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER \
589 || (REGNO) == MMIX_ARG_POINTER_REGNUM \
590 || (reg_renumber[REGNO] > 0 \
591 && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
593 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
595 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
596 mmix_preferred_reload_class (X, CLASS)
598 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
599 mmix_preferred_output_reload_class (X, CLASS)
601 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
602 mmix_secondary_reload_class (CLASS, MODE, X, 1)
604 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
605 mmix_secondary_reload_class (CLASS, MODE, X, 0)
607 #define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
609 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
610 mmix_const_ok_for_letter_p (VALUE, C)
612 #define EXTRA_CONSTRAINT(VALUE, C) \
613 mmix_extra_constraint (VALUE, C, MMIX_REG_OK_STRICT)
615 /* Do we need anything serious here? Yes, any FLOT constant. */
616 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) \
617 mmix_const_double_ok_for_letter_p (VALUE, C)
620 /* Node: Frame Layout */
622 #define STACK_GROWS_DOWNWARD
623 #define FRAME_GROWS_DOWNWARD
625 #define STARTING_FRAME_OFFSET \
626 mmix_starting_frame_offset ()
628 /* There is a stack slot between the frame-pointer and the first
629 parameter, where the return address is sometimes stored. FIXME:
631 #define FIRST_PARM_OFFSET(FUNDECL) 8
633 #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
634 mmix_dynamic_chain_address (FRAMEADDR)
636 /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented. */
638 #define SETUP_FRAME_ADDRESSES() \
639 mmix_setup_frame_addresses ()
641 #define RETURN_ADDR_RTX(COUNT, FRAME) \
642 mmix_return_addr_rtx (COUNT, FRAME)
644 /* It's in rJ before we store it somewhere. */
645 #define INCOMING_RETURN_ADDR_RTX \
646 gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
648 /* FIXME: This does not seem properly documented or cross-indexed.
649 Nowhere except in the code does it say it *has* to be in the range
650 0..255, or else it will be truncated. That goes for the default too. */
651 #define DWARF_FRAME_RETURN_COLUMN \
652 DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
654 /* No return address is stored there. */
655 #define INCOMING_FRAME_SP_OFFSET 0
657 /* Node: Stack Checking */
661 /* Node: Exception Handling */
663 #define EH_RETURN_DATA_REGNO(N) \
664 mmix_eh_return_data_regno (N)
666 #define EH_RETURN_STACKADJ_RTX \
667 mmix_eh_return_stackadj_rtx ()
669 #define EH_RETURN_HANDLER_RTX \
670 mmix_eh_return_handler_rtx ()
672 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
673 mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
675 /* Node: Frame Registers */
676 #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
678 /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
679 what register we want to use. */
680 #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
681 #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
683 #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
686 /* Node: Elimination */
687 /* FIXME: Is this requirement built-in? Anyway, we should try to get rid
688 of it; we can deduce the value. */
689 #define FRAME_POINTER_REQUIRED (nonlocal_goto_stack_level != NULL_RTX)
691 /* The frame-pointer is stored in a location that either counts to the
692 offset of incoming parameters, or that counts to the offset of the
693 frame, so we can't use a single offset. We therefore eliminate those
695 #define ELIMINABLE_REGS \
696 {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
697 {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \
698 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
700 /* We need not worry about when the frame-pointer is required for other
701 reasons; GCC takes care of those cases. */
702 #define CAN_ELIMINATE(FROM, TO) 1
704 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
705 (OFFSET) = mmix_initial_elimination_offset (FROM, TO);
708 /* Node: Stack Arguments */
710 #define ACCUMULATE_OUTGOING_ARGS 1
712 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
715 /* Node: Register Arguments */
716 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
717 mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 0)
719 #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED) \
720 mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 1)
722 #define FUNCTION_ARG_PASS_BY_REFERENCE(CUM, MODE, TYPE, NAMED) \
723 mmix_function_arg_pass_by_reference (&(CUM), MODE, TYPE, NAMED)
725 /* This *sounds* good, but does not seem to be implemented correctly to
726 be a win; at least it wasn't in 2.7.2. FIXME: Check and perhaps
727 replace with a big comment. */
728 #define FUNCTION_ARG_CALLEE_COPIES(CUM, MODE, TYPE, NAMED) 1
730 typedef struct { int regs; int lib; int now_varargs; } CUMULATIVE_ARGS;
732 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT) \
733 ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0), (CUM).now_varargs = 0)
735 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
737 = ((MUST_PASS_IN_STACK (MODE, TYPE)) \
738 || (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE) > 8 \
739 && !TARGET_LIBFUNC && !(CUM).lib)) \
740 ? (MMIX_MAX_ARGS_IN_REGS) + 1 \
741 : (CUM).regs + (7 + (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE))) / 8)
743 #define FUNCTION_ARG_REGNO_P(REGNO) \
744 mmix_function_arg_regno_p (REGNO, 0)
746 #define FUNCTION_INCOMING_ARG_REGNO_P(REGNO) \
747 mmix_function_arg_regno_p (REGNO, 1)
750 /* Node: Register Arguments */
752 #define FUNCTION_VALUE(VALTYPE, FUNC) \
753 gen_rtx_REG (TYPE_MODE (VALTYPE), MMIX_RETURN_VALUE_REGNUM)
755 /* This needs to take care of the register hole for complex return values. */
756 #define FUNCTION_OUTGOING_VALUE(VALTYPE, FUNC) \
757 mmix_function_outgoing_value (VALTYPE, FUNC)
759 #define LIBCALL_VALUE(MODE) \
760 gen_rtx_REG (MODE, MMIX_OUTGOING_RETURN_VALUE_REGNUM)
762 #define FUNCTION_VALUE_REGNO_P(REGNO) \
763 ((REGNO) == MMIX_OUTGOING_RETURN_VALUE_REGNUM)
766 /* Node: Aggregate Return */
768 #define STRUCT_VALUE_REGNUM MMIX_STRUCT_VALUE_REGNUM
771 /* Node: Caller Saves */
775 /* Node: Function Entry */
777 /* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
778 TARGET_ASM_FUNCTION_EPILOGUE. */
780 /* We need to say that the epilogue uses the return address, so the
781 initial-value machinery restores it. FIXME: Some targets
782 conditionalize on "reload_completed &&". Investigate difference.
783 FIXME: Not needed if nonlocal_goto_stack_level. */
784 #define EPILOGUE_USES(REGNO) \
785 ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
787 #define ASM_OUTPUT_MI_THUNK(FILE, THUNK_FNDECL, DELTA, FUNCTION) \
788 mmix_asm_output_mi_thunk (FILE, THUNK_FNDECL, DELTA, FUNCTION)
791 /* Node: Profiling */
792 #define FUNCTION_PROFILER(FILE, LABELNO) \
793 mmix_function_profiler (FILE, LABELNO)
797 /* For the moment, let's stick to pushing argument registers on the stack.
798 Later, we can parse all arguments in registers, to improve
800 #define SETUP_INCOMING_VARARGS(A, M, T, P, S) \
801 mmix_setup_incoming_varargs(&(A), M, T, &(P), S)
803 /* FIXME: This and other EXPAND_BUILTIN_VA_... target macros are not
804 documented, although used by several targets. */
805 #define EXPAND_BUILTIN_VA_ARG(VALIST, TYPE) \
806 mmix_expand_builtin_va_arg (VALIST, TYPE)
808 /* Node: Trampolines */
810 #define TRAMPOLINE_TEMPLATE(FILE) \
811 mmix_trampoline_template (FILE)
813 #define TRAMPOLINE_SIZE mmix_trampoline_size
814 #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, STATIC_CHAIN) \
815 mmix_initialize_trampoline (ADDR, FNADDR, STATIC_CHAIN)
818 /* Node: Library Calls */
820 #define TARGET_MEM_FUNCTIONS
823 /* Node: Addressing Modes */
825 #define CONSTANT_ADDRESS_P(X) \
826 mmix_constant_address_p (X)
828 #define MAX_REGS_PER_ADDRESS 2
830 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL) \
831 if (mmix_legitimate_address (MODE, X, MMIX_REG_OK_STRICT)) \
834 #ifndef REG_OK_STRICT
835 # define REG_OK_FOR_BASE_P(X) \
836 (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \
837 || REGNO (X) == MMIX_ARG_POINTER_REGNUM \
838 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
840 # define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
841 #endif /* REG_OK_STRICT */
843 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
845 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
847 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL)
849 #define LEGITIMATE_CONSTANT_P(X) \
850 mmix_legitimate_constant_p (X)
853 /* Node: Condition Code */
855 #define EXTRA_CC_MODES \
856 CC(CC_UNSmode, "CC_UNS") \
857 CC(CC_FPmode, "CC_FP") \
858 CC(CC_FPEQmode, "CC_FPEQ") \
859 CC(CC_FUNmode, "CC_FUN")
861 #define SELECT_CC_MODE(OP, X, Y) \
862 mmix_select_cc_mode (OP, X, Y)
864 #define CANONICALIZE_COMPARISON(CODE, OP0, OP1) \
865 mmix_canonicalize_comparison (&(CODE), &(OP0), &(OP1));
867 #define REVERSIBLE_CC_MODE(MODE) \
868 mmix_reversible_cc_mode (MODE)
873 /* This one takes on both the RTX_COSTS and CONST_COSTS tasks. */
874 #define DEFAULT_RTX_COSTS(X, CODE, OUTER_CODE) \
877 if (mmix_rtx_cost_recalculated (X, CODE, OUTER_CODE, \
879 return mmix_rtx_cost; \
882 #define ADDRESS_COST(ADDRESS) mmix_address_cost (ADDRESS)
884 /* The special registers can only move to and from general regs, and we
885 need to check that their constraints match, so say 3 for them. */
886 /* WARNING: gcc-2.7.2.2 i686-pc-linux-gnulibc1 (as shipped with RH 4.2)
887 miscompiles reload1.c:reload_cse_simplify_set; a call to
888 reload_cse_regno_equal_p is missing when checking if a substitution of
889 a register setting is valid if this is defined to just the expression
890 in mmix_register_move_cost.
892 Symptom: a (all?) register setting is optimized away for e.g.
893 "char *p1(char *p) { return p+1; }" and the value of register zero ($0)
896 We can workaround by making this a function call - unknown if this
897 causes dire speed effects. */
898 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
899 mmix_register_move_cost (MODE, FROM, TO)
901 #define SLOW_BYTE_ACCESS 0
906 /* This must be a constant string, since it's used in crtstuff.c. */
907 #define TEXT_SECTION_ASM_OP \
908 "\t.text ! mmixal:= 9H LOC 8B"
910 /* FIXME: Not documented. */
911 #define DATA_SECTION_ASM_OP \
912 mmix_data_section_asm_op ()
914 /* Stuff copied from elfos.h. */
915 #define EXTRA_SECTIONS in_const
917 #define EXTRA_SECTION_FUNCTIONS \
918 CONST_SECTION_FUNCTION
920 #define READONLY_DATA_SECTION() const_section ()
922 #define CONST_SECTION_ASM_OP "\t.section\t.rodata"
924 #define CONST_SECTION_FUNCTION \
928 if (in_section != in_const) \
930 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
931 in_section = in_const; \
935 #undef SELECT_RTX_SECTION
936 #define SELECT_RTX_SECTION(MODE, RTX, ALIGN) const_section ()
938 #define SELECT_SECTION(DECL, RELOC, ALIGN) \
939 mmix_select_section (DECL, RELOC, ALIGN)
941 #define ENCODE_SECTION_INFO(DECL) \
942 mmix_encode_section_info (DECL)
944 #define STRIP_NAME_ENCODING(VAR, SYM_NAME) \
945 (VAR) = mmix_strip_name_encoding (SYM_NAME)
947 #define UNIQUE_SECTION(DECL, RELOC) \
948 mmix_unique_section (decl, reloc)
954 /* Node: File Framework */
956 #define ASM_FILE_START(STREAM) \
957 mmix_asm_file_start (STREAM)
959 #define ASM_FILE_END(STREAM) \
960 mmix_asm_file_end (STREAM)
962 /* While any other punctuation character but ";" would do, we prefer "%"
963 or "!"; "!" is an unary operator and so will not be mistakenly included
964 in correctly formed expressions. The hash character adds mass; catches
965 the eye. We can't have it as a comment char by itself, since it's a
966 hex-number prefix. */
967 #define ASM_COMMENT_START "!#"
969 /* These aren't currently functional. We just keep them as markers. */
970 #define ASM_APP_ON "%APP\n"
971 #define ASM_APP_OFF "%NO_APP\n"
973 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
974 mmix_asm_output_source_filename (STREAM, NAME)
976 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
977 mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
979 #define ASM_OUTPUT_SOURCE_LINE(STREAM, LINE) \
980 mmix_asm_output_source_line (STREAM, LINE)
982 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
985 /* Node: Data Output */
987 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
988 mmix_asm_output_ascii (STREAM, PTR, LEN)
990 /* Node: Uninitialized Data */
992 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
993 mmix_asm_output_aligned_common (ST, N, S, A)
995 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
996 mmix_asm_output_aligned_local (ST, N, S, A)
999 /* Node: Label Output */
1001 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
1002 mmix_asm_output_label (STREAM, NAME)
1004 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
1005 mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
1007 #define ASM_GLOBALIZE_LABEL(STREAM, NAME) \
1008 mmix_asm_globalize_label (STREAM, NAME)
1010 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
1011 mmix_asm_weaken_label (STREAM, NAME)
1013 #define MAKE_DECL_ONE_ONLY(DECL) \
1014 mmix_make_decl_one_only (DECL)
1016 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
1017 mmix_asm_output_labelref (STREAM, NAME)
1019 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, PREFIX, NUM) \
1020 mmix_asm_output_internal_label (STREAM, PREFIX, NUM)
1022 /* We insert a ":" to disambiguate against user symbols like L5. */
1023 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
1024 sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
1026 /* Insert "::"; these are rarer than internal labels. FIXME: Make sure no
1027 ":" is seen in the object file; we don't really want that mmixal
1028 feature visible there. We don't want the default, which uses a dot;
1029 that'd be incompatible with mmixal. */
1030 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
1031 ((OUTPUT) = (char *) alloca (strlen ((NAME)) + 2 + 10), \
1032 sprintf ((OUTPUT), "%s::%d", (NAME), (LABELNO)))
1034 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
1035 mmix_asm_output_def (STREAM, NAME, VALUE)
1037 #define ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL(STREAM, SY, HI, LO) \
1038 mmix_asm_output_define_label_difference_symbol (STREAM, SY, HI, LO)
1041 /* Node: Macros for Initialization */
1042 /* We're compiling to ELF and linking to MMO; all ELF features that GCC
1043 care for are there. FIXME: Are they? */
1045 /* These must be constant strings, since they're used in crtstuff.c. */
1046 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
1048 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
1050 #define OBJECT_FORMAT_ELF
1053 /* Node: Instruction Output */
1055 /* The non-$ register names must be prefixed with ":", since they're
1056 affected by PREFIX. We provide the non-colon names as additional
1058 #define REGISTER_NAMES \
1059 {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7", \
1060 "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", \
1061 "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23", \
1062 "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31", \
1063 "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39", \
1064 "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47", \
1065 "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55", \
1066 "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63", \
1067 "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71", \
1068 "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79", \
1069 "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87", \
1070 "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95", \
1071 "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103", \
1072 "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111", \
1073 "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119", \
1074 "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127", \
1075 "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135", \
1076 "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143", \
1077 "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151", \
1078 "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159", \
1079 "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167", \
1080 "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175", \
1081 "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183", \
1082 "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191", \
1083 "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199", \
1084 "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207", \
1085 "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215", \
1086 "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223", \
1087 "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231", \
1088 "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239", \
1089 "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247", \
1090 "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255", \
1091 ":rD", ":rE", ":rH", ":rJ", ":rR", "ap_!BAD!"}
1093 #define ADDITIONAL_REGISTER_NAMES \
1094 {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257}, \
1095 {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}}
1097 #define PRINT_OPERAND(STREAM, X, CODE) \
1098 mmix_print_operand (STREAM, X, CODE)
1100 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
1101 mmix_print_operand_punct_valid_p (CODE)
1103 #define PRINT_OPERAND_ADDRESS(STREAM, X) \
1104 mmix_print_operand_address (STREAM, X)
1107 #define USER_LABEL_PREFIX "_"
1110 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
1111 mmix_asm_output_reg_push (STREAM, REGNO)
1113 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
1114 mmix_asm_output_reg_pop (STREAM, REGNO)
1117 /* Node: Dispatch Tables */
1119 /* We define both types, since SImode is the better, but DImode the only
1120 possible for mmixal so that's the one actually used. */
1121 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
1122 mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
1124 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
1125 mmix_asm_output_addr_vec_elt (STREAM, VALUE)
1128 /* Node: Exception Region Output */
1131 /* Node: Alignment Output */
1133 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
1134 mmix_asm_output_skip (STREAM, NBYTES)
1136 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
1137 mmix_asm_output_align (STREAM, POWER)
1140 /* Node: All Debuggers */
1142 #define DBX_REGISTER_NUMBER(REGNO) \
1143 mmix_dbx_register_number (REGNO)
1146 /* Node: DBX Options */
1148 /* Node: DBX Hooks */
1150 /* Node: File Names and DBX */
1154 /* Node: SDB and DWARF */
1155 #define DWARF2_DEBUGGING_INFO
1156 #define DWARF2_ASM_LINE_DEBUG_INFO 1
1158 /* Node: Cross-compilation */
1160 /* FIXME: I don't know whether it is best to tweak emit-rtl.c to handle
1161 the case where sizeof (float) == word_size / 2 on the target, or to fix
1162 real.h to define REAL_ARITHMETIC in that case. Anyway, it should be
1163 documented that a target can define this to force emulation. Note that
1164 we don't check #ifdef CROSS_COMPILE here; not even if mmix gets
1165 self-hosted must we do that. Case gcc.c-torture/compile/930611-1.c. */
1166 #define REAL_ARITHMETIC
1171 #define PREDICATE_CODES \
1172 {"mmix_reg_cc_operand", {SUBREG, REG}}, \
1173 {"mmix_foldable_comparison_operator", \
1174 {NE, EQ, GE, GT, LE, LT}}, \
1175 /* All '<', actually. */ \
1176 {"mmix_comparison_operator", \
1177 {NE, EQ, GE, GT, LE, LT, GEU, GTU, LEU, \
1178 LTU, UNORDERED, ORDERED, UNEQ, UNGE, UNLE, \
1180 {"mmix_symbolic_or_address_operand", \
1181 {SYMBOL_REF, LABEL_REF, CONST, \
1182 SUBREG, REG, PLUS}}, \
1183 {"mmix_reg_or_constant_operand", \
1184 {CONST_INT, CONST_DOUBLE, SUBREG, REG}}, \
1185 {"mmix_reg_or_8bit_or_256_operand", \
1186 {CONST_INT, CONST_DOUBLE, SUBREG, REG}}, \
1187 {"mmix_reg_or_8bit_operand", \
1188 {CONST_INT, CONST_DOUBLE, SUBREG, REG}}, \
1189 {"mmix_reg_or_0_operand", \
1190 {CONST_INT, CONST_DOUBLE, SUBREG, REG}},
1192 #define SPECIAL_MODE_PREDICATES "mmix_symbolic_or_address_operand",
1194 /* There's no way to get a PC-relative offset into tables for SImode, so
1195 for the moment we have absolute entries in DImode.
1196 When we're going ELF, these should be SImode and 1. */
1197 #define CASE_VECTOR_MODE DImode
1198 #define CASE_VECTOR_PC_RELATIVE 0
1200 #define WORD_REGISTER_OPERATIONS
1202 /* We have a choice, which makes this yet another parameter to tweak. The
1203 gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
1204 than "unsigned int", and we have signed characters. FIXME: measure. */
1205 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
1209 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1211 /* We have a choice here too. */
1213 /* FIXME: Revisit, we don't have scc expanders yet. */
1214 #define STORE_FLAG_VALUE 1
1217 #define Pmode DImode
1219 #define FUNCTION_MODE QImode
1221 /* When in due time we *will* have some specific headers. */
1222 #define NO_IMPLICIT_EXTERN_C
1224 #define HANDLE_SYSV_PRAGMA
1226 /* These are checked. */
1227 #define DOLLARS_IN_IDENTIFIERS 0
1228 #define NO_DOLLAR_IN_LABEL
1229 #define NO_DOT_IN_LABEL
1231 #endif /* GCC_MMIX_H */
1234 * eval: (c-set-style "gnu")
1235 * indent-tabs-mode: t