1 /* Definitions of target machine for GNU compiler, for MMIX.
2 Copyright (C) 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
3 Contributed by Hans-Peter Nilsson (hp@bitrange.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to
19 the Free Software Foundation, 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 MMIX_rR_REGNUM
51 #define MMIX_ARG_POINTER_REGNUM 261
52 #define MMIX_rO_REGNUM 262
53 #define MMIX_LAST_STACK_REGISTER_REGNUM 31
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)
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
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
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
76 # define MMIX_REG_OK_STRICT 1
78 # define MMIX_REG_OK_STRICT 0
81 #define MMIX_FUNCTION_ARG_SIZE(MODE, TYPE) \
82 ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) : int_size_in_bytes (TYPE))
84 /* Declarations for helper variables that are not tied to a particular
86 extern GTY(()) rtx mmix_compare_op0
;
87 extern GTY(()) rtx mmix_compare_op1
;
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
92 struct machine_function
GTY(())
95 int highest_saved_stack_register
;
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.
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. */
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"
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. */
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}"
127 /* Put unused option values here. */
128 extern const char *mmix_cc1_ignored_option
;
130 #define TARGET_OPTIONS \
131 {{"set-program-start=", &mmix_cc1_ignored_option, \
132 N_("Set start-address of the program"), 0}, \
133 {"set-data-start=", &mmix_cc1_ignored_option, \
134 N_("Set start-address of data"), 0} }
136 /* FIXME: There's no provision for profiling here. */
137 #define STARTFILE_SPEC \
138 "crti%O%s crtbegin%O%s"
140 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
142 /* Node: Run-time Target */
144 /* Define __LONG_MAX__, since we're advised not to change glimits.h. */
145 #define TARGET_CPU_CPP_BUILTINS() \
148 builtin_define ("__mmix__"); \
149 builtin_define ("__MMIX__"); \
150 if (TARGET_ABI_GNU) \
151 builtin_define ("__MMIX_ABI_GNU__"); \
153 builtin_define ("__MMIX_ABI_MMIXWARE__"); \
157 extern int target_flags
;
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
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 offsetting 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 have compiled with -mno-base-addresses. */
178 #define TARGET_MASK_BASE_ADDRESSES 128
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)
191 #define TARGET_DEFAULT \
192 (TARGET_MASK_BRANCH_PREDICT | TARGET_MASK_BASE_ADDRESSES \
193 | TARGET_MASK_USE_RETURN_INSN)
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")}, \
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, ""}}
234 /* Unfortunately, this must not reference anything in "mmix.c". */
235 #define TARGET_VERSION \
236 fprintf (stderr, " (MMIX)")
238 #define OVERRIDE_OPTIONS mmix_override_options ()
240 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE) \
244 flag_regmove = TRUE; \
246 if (SIZE || LEVEL > 1) \
248 flag_omit_frame_pointer = TRUE; \
249 flag_strength_reduce = FALSE; \
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 */
259 /* Node: Per-Function Data */
260 #define INIT_EXPANDERS mmix_init_expanders ()
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
272 /* FIXME: Promotion of modes currently generates slow code, extending
273 before every operation. */
274 /* I'm a little bit undecided about this one. It might be beneficial to
275 promote all operations. */
277 #define PROMOTE_FUNCTION_MODE(MODE, UNSIGNEDP, TYPE) \
279 if (GET_MODE_CLASS (MODE) == MODE_INT \
280 && GET_MODE_SIZE (MODE) < 8) \
283 /* Do the following some time later, \
284 scrutinizing differences. */ \
285 if (0) (UNSIGNEDP) = 0; \
289 /* We need to align everything to 64 bits that can affect the alignment
290 of other types. Since address N is interpreted in MMIX as (N modulo
291 access_size), we must align. */
292 #define PARM_BOUNDARY 64
293 #define STACK_BOUNDARY 64
294 #define FUNCTION_BOUNDARY 32
295 #define BIGGEST_ALIGNMENT 64
297 /* This one is only used in the ADA front end. */
298 #define MINIMUM_ATOMIC_ALIGNMENT 8
300 /* Copied from elfos.h. */
301 #define MAX_OFILE_ALIGNMENT (32768 * 8)
303 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
304 mmix_data_alignment (TYPE, BASIC_ALIGN)
306 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
307 mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
309 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
310 mmix_local_alignment (TYPE, BASIC_ALIGN)
312 /* Following other ports, this seems to most commonly be the word-size,
313 so let's do that here too. */
314 #define EMPTY_FIELD_BOUNDARY 64
316 /* We chose to have this low solely for similarity with the alpha. It has
317 nothing to do with passing the tests dg/c99-scope-2 and
318 execute/align-1.c. Nothing. Though the tests seem wrong. Padding of
319 the structure is automatically added to get alignment when needed if we
320 set this to just byte-boundary. */
321 #define STRUCTURE_SIZE_BOUNDARY 8
323 /* The lower bits are ignored. */
324 #define STRICT_ALIGNMENT 1
327 /* Node: Type Layout */
329 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
330 but then an occasional MMIX programmer needs to know how to put a lot
331 of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
332 than the "intuitive" char, short and int types. */
333 #define INT_TYPE_SIZE 32
334 #define SHORT_TYPE_SIZE 16
335 #define LONG_LONG_TYPE_SIZE 64
337 #define FLOAT_TYPE_SIZE 32
338 #define DOUBLE_TYPE_SIZE 64
339 #define LONG_DOUBLE_TYPE_SIZE 64
341 #define DEFAULT_SIGNED_CHAR 1
344 /* Node: Register Basics */
345 /* We tell GCC about all 256 general registers, and we also include
346 rD, rE, rH, rJ, rR and rO (in that order) so we can describe what insns
347 clobber them. We use a faked register for the argument pointer. It is
348 always eliminated towards the frame-pointer or the stack-pointer, never
349 output in assembly. Any fixed register would do for this, like $255,
350 but future debugging is easier when using a separate register. It
351 counts as a global register for pseudorandom reasons. */
352 #define FIRST_PSEUDO_REGISTER 263
354 /* We treat general registers with no assigned purpose as fixed. The
355 stack pointer, $254, is also fixed. Register $255 is referred to as a
356 temporary register in the MMIX papers, and used as such in mmixal, so
357 it should not be used as a stack pointer. We set it to fixed, and use
358 it "manually" at times of despair. */
359 #define FIXED_REGISTERS \
360 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
361 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
362 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
363 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
364 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
365 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
366 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
367 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
368 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
369 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
370 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
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, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
376 1, 1, 0, 0, 0, 1, 1 \
379 /* General registers are fixed and therefore "historically" marked
380 call-used. (FIXME: This has changed). Registers $15..$31 are
381 call-clobbered; we'll put arguments in $16 and up, and we need $15 for
382 the MMIX register-stack "hole". */
383 #define CALL_USED_REGISTERS \
384 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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, 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, 0, 1, 1, \
400 1, 1, 1, 1, 1, 1, 1 \
403 #define CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage ()
405 /* No INCOMING_REGNO or OUTGOING_REGNO, since those macros are not usable
406 for MMIX: it doesn't have a fixed register window size. FIXME: Perhaps
407 we should say something about $0..$15 may sometimes be the incoming
408 $16..$31. Those macros need better documentation; it looks like
409 they're just bogus and that FUNCTION_INCOMING_ARG_REGNO_P and
410 FUNCTION_OUTGOING_VALUE should be used where they're used. For the
411 moment, do nothing; things seem to work anyway. */
413 /* Defining LOCAL_REGNO is necessary in presence of prologue/epilogue,
414 else GCC will be confused that those registers aren't saved and
416 #define LOCAL_REGNO(REGNO) mmix_local_regno (REGNO)
418 /* Node: Allocation Order */
420 /* We should allocate registers from 0 to 31 by increasing number, because
421 I think that's what people expect. Beyond that, just use
422 call-clobbered global registers first, then call-clobbered special
423 registers. Last, the fixed registers. */
424 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER \
425 { 0, 1, 2, 3, 4, 5, 6, 7, \
426 8, 9, 10, 11, 12, 13, 14, 15, \
427 16, 17, 18, 19, 20, 21, 22, 23, \
428 24, 25, 26, 27, 28, 29, 30, 31, \
430 252, 251, 250, 249, 248, 247, \
436 32, 33, 34, 35, 36, 37, 38, 39, \
437 40, 41, 42, 43, 44, 45, 46, 47, \
438 48, 49, 50, 51, 52, 53, 54, 55, \
439 56, 57, 58, 59, 60, 61, 62, 63, \
440 64, 65, 66, 67, 68, 69, 70, 71, \
441 72, 73, 74, 75, 76, 77, 78, 79, \
442 80, 81, 82, 83, 84, 85, 86, 87, \
443 88, 89, 90, 91, 92, 93, 94, 95, \
444 96, 97, 98, 99, 100, 101, 102, 103, \
445 104, 105, 106, 107, 108, 109, 110, 111, \
446 112, 113, 114, 115, 116, 117, 118, 119, \
447 120, 121, 122, 123, 124, 125, 126, 127, \
448 128, 129, 130, 131, 132, 133, 134, 135, \
449 136, 137, 138, 139, 140, 141, 142, 143, \
450 144, 145, 146, 147, 148, 149, 150, 151, \
451 152, 153, 154, 155, 156, 157, 158, 159, \
452 160, 161, 162, 163, 164, 165, 166, 167, \
453 168, 169, 170, 171, 172, 173, 174, 175, \
454 176, 177, 178, 179, 180, 181, 182, 183, \
455 184, 185, 186, 187, 188, 189, 190, 191, \
456 192, 193, 194, 195, 196, 197, 198, 199, \
457 200, 201, 202, 203, 204, 205, 206, 207, \
458 208, 209, 210, 211, 212, 213, 214, 215, \
459 216, 217, 218, 219, 220, 221, 222, 223, \
460 224, 225, 226, 227, 228, 229, 230, 231, \
461 232, 233, 234, 235, 236, 237, 238, 239, \
462 240, 241, 242, 243, 244, 245, 246, \
464 254, 255, 256, 257, 261, 262 \
467 /* As a convenience, we put this nearby, for ease of comparison.
468 First, call-clobbered registers in reverse order of assignment as
469 parameters (also the top ones; not because they're parameters, but
472 Second, saved registers that go on the register-stack.
474 Third, special registers rH, rR and rJ. They should not normally be
475 allocated, but since they're call-clobbered, it is cheaper to use one
476 of them than using a call-saved register for a call-clobbered use,
477 assuming it is referenced a very limited number of times. Other global
478 and fixed registers come next; they are never allocated. */
479 #define MMIX_GNU_ABI_REG_ALLOC_ORDER \
480 { 252, 251, 250, 249, 248, 247, 246, \
481 245, 244, 243, 242, 241, 240, 239, 238, \
482 237, 236, 235, 234, 233, 232, 231, \
484 0, 1, 2, 3, 4, 5, 6, 7, \
485 8, 9, 10, 11, 12, 13, 14, 15, \
486 16, 17, 18, 19, 20, 21, 22, 23, \
487 24, 25, 26, 27, 28, 29, 30, 31, \
493 32, 33, 34, 35, 36, 37, 38, 39, \
494 40, 41, 42, 43, 44, 45, 46, 47, \
495 48, 49, 50, 51, 52, 53, 54, 55, \
496 56, 57, 58, 59, 60, 61, 62, 63, \
497 64, 65, 66, 67, 68, 69, 70, 71, \
498 72, 73, 74, 75, 76, 77, 78, 79, \
499 80, 81, 82, 83, 84, 85, 86, 87, \
500 88, 89, 90, 91, 92, 93, 94, 95, \
501 96, 97, 98, 99, 100, 101, 102, 103, \
502 104, 105, 106, 107, 108, 109, 110, 111, \
503 112, 113, 114, 115, 116, 117, 118, 119, \
504 120, 121, 122, 123, 124, 125, 126, 127, \
505 128, 129, 130, 131, 132, 133, 134, 135, \
506 136, 137, 138, 139, 140, 141, 142, 143, \
507 144, 145, 146, 147, 148, 149, 150, 151, \
508 152, 153, 154, 155, 156, 157, 158, 159, \
509 160, 161, 162, 163, 164, 165, 166, 167, \
510 168, 169, 170, 171, 172, 173, 174, 175, \
511 176, 177, 178, 179, 180, 181, 182, 183, \
512 184, 185, 186, 187, 188, 189, 190, 191, \
513 192, 193, 194, 195, 196, 197, 198, 199, \
514 200, 201, 202, 203, 204, 205, 206, 207, \
515 208, 209, 210, 211, 212, 213, 214, 215, \
516 216, 217, 218, 219, 220, 221, 222, 223, \
517 224, 225, 226, 227, 228, 229, 230, \
519 254, 255, 256, 257, 261, 262 \
522 /* The default one. */
523 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
525 /* Node: Values in Registers */
527 #define HARD_REGNO_NREGS(REGNO, MODE) \
528 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) \
531 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
533 /* Note that no register can really be accessed in single-float mode, so
534 we *can* say 1 here. FIXME: Will TRT happen for single-float, or do
535 we have to punt to libgcc1.asm? */
536 #define MODES_TIEABLE_P(MODE1, MODE2) 1
539 /* Node: Leaf Functions */
543 /* Node: Register Classes */
547 NO_REGS
, GENERAL_REGS
, REMAINDER_REG
, HIMULT_REG
,
548 SYSTEM_REGS
, ALL_REGS
, LIM_REG_CLASSES
551 #define N_REG_CLASSES (int) LIM_REG_CLASSES
553 #define REG_CLASS_NAMES \
554 {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG", \
555 "SYSTEM_REGS", "ALL_REGS"}
557 /* Note that the contents of each item is always 32 bits. */
558 #define REG_CLASS_CONTENTS \
559 {{0, 0, 0, 0, 0, 0, 0, 0, 0}, \
560 {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20}, \
561 {0, 0, 0, 0, 0, 0, 0, 0, 0x10}, \
562 {0, 0, 0, 0, 0, 0, 0, 0, 4}, \
563 {0, 0, 0, 0, 0, 0, 0, 0, 0x7f}, \
564 {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x7f}}
566 #define REGNO_REG_CLASS(REGNO) \
567 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER \
568 || (REGNO) == MMIX_ARG_POINTER_REGNUM \
570 : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG \
571 : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
573 #define BASE_REG_CLASS GENERAL_REGS
575 #define INDEX_REG_CLASS GENERAL_REGS
577 #define REG_CLASS_FROM_LETTER(CHAR) \
578 ((CHAR) == 'x' ? SYSTEM_REGS \
579 : (CHAR) == 'y' ? REMAINDER_REG \
580 : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
582 #define REGNO_OK_FOR_BASE_P(REGNO) \
583 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER \
584 || (REGNO) == MMIX_ARG_POINTER_REGNUM \
585 || (reg_renumber[REGNO] > 0 \
586 && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
588 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
590 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
591 mmix_preferred_reload_class (X, CLASS)
593 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
594 mmix_preferred_output_reload_class (X, CLASS)
596 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
597 mmix_secondary_reload_class (CLASS, MODE, X, 1)
599 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
600 mmix_secondary_reload_class (CLASS, MODE, X, 0)
602 #define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
604 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
605 mmix_const_ok_for_letter_p (VALUE, C)
607 #define EXTRA_CONSTRAINT(VALUE, C) \
608 mmix_extra_constraint (VALUE, C, MMIX_REG_OK_STRICT)
610 /* Do we need anything serious here? Yes, any FLOT constant. */
611 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) \
612 mmix_const_double_ok_for_letter_p (VALUE, C)
615 /* Node: Frame Layout */
617 #define STACK_GROWS_DOWNWARD
618 #define FRAME_GROWS_DOWNWARD
620 #define STARTING_FRAME_OFFSET \
621 mmix_starting_frame_offset ()
623 #define FIRST_PARM_OFFSET(FUNDECL) 0
625 #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
626 mmix_dynamic_chain_address (FRAMEADDR)
628 /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented. */
630 #define SETUP_FRAME_ADDRESSES() \
631 mmix_setup_frame_addresses ()
633 #define RETURN_ADDR_RTX(COUNT, FRAME) \
634 mmix_return_addr_rtx (COUNT, FRAME)
636 /* It's in rJ before we store it somewhere. */
637 #define INCOMING_RETURN_ADDR_RTX \
638 gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
640 /* FIXME: This does not seem properly documented or cross-indexed.
641 Nowhere except in the code does it say it *has* to be in the range
642 0..255, or else it will be truncated. That goes for the default too. */
643 #define DWARF_FRAME_RETURN_COLUMN \
644 DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
646 /* No return address is stored there. */
647 #define INCOMING_FRAME_SP_OFFSET 0
649 /* Node: Stack Checking */
653 /* Node: Exception Handling */
655 #define EH_RETURN_DATA_REGNO(N) \
656 mmix_eh_return_data_regno (N)
658 #define EH_RETURN_STACKADJ_RTX \
659 mmix_eh_return_stackadj_rtx ()
661 #define EH_RETURN_HANDLER_RTX \
662 mmix_eh_return_handler_rtx ()
664 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
665 mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
667 /* Node: Frame Registers */
668 #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
670 /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
671 what register we want to use. */
672 #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
673 #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
675 #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
678 /* Node: Elimination */
679 /* FIXME: Is this requirement built-in? Anyway, we should try to get rid
680 of it; we can deduce the value. */
681 #define FRAME_POINTER_REQUIRED current_function_has_nonlocal_label
683 /* The frame-pointer is stored in a location that either counts to the
684 offset of incoming parameters, or that counts to the offset of the
685 frame, so we can't use a single offset. We therefore eliminate those
687 #define ELIMINABLE_REGS \
688 {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
689 {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \
690 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
692 /* We need not worry about when the frame-pointer is required for other
693 reasons; GCC takes care of those cases. */
694 #define CAN_ELIMINATE(FROM, TO) 1
696 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
697 (OFFSET) = mmix_initial_elimination_offset (FROM, TO)
700 /* Node: Stack Arguments */
702 #define ACCUMULATE_OUTGOING_ARGS 1
704 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
707 /* Node: Register Arguments */
708 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
709 mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 0)
711 #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED) \
712 mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 1)
714 typedef struct { int regs
; int lib
; } CUMULATIVE_ARGS
;
716 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
717 ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0))
719 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
721 = ((targetm.calls.must_pass_in_stack (MODE, TYPE)) \
722 || (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE) > 8 \
723 && !TARGET_LIBFUNC && !(CUM).lib)) \
724 ? (MMIX_MAX_ARGS_IN_REGS) + 1 \
725 : (CUM).regs + (7 + (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE))) / 8)
727 #define FUNCTION_ARG_REGNO_P(REGNO) \
728 mmix_function_arg_regno_p (REGNO, 0)
730 #define FUNCTION_INCOMING_ARG_REGNO_P(REGNO) \
731 mmix_function_arg_regno_p (REGNO, 1)
734 /* Node: Register Arguments */
736 #define FUNCTION_VALUE(VALTYPE, FUNC) \
737 gen_rtx_REG (TYPE_MODE (VALTYPE), MMIX_RETURN_VALUE_REGNUM)
739 /* This needs to take care of the register hole for complex return values. */
740 #define FUNCTION_OUTGOING_VALUE(VALTYPE, FUNC) \
741 mmix_function_outgoing_value (VALTYPE, FUNC)
743 #define LIBCALL_VALUE(MODE) \
744 gen_rtx_REG (MODE, MMIX_RETURN_VALUE_REGNUM)
746 #define FUNCTION_VALUE_REGNO_P(REGNO) \
747 mmix_function_value_regno_p (REGNO)
750 /* Node: Caller Saves */
754 /* Node: Function Entry */
756 /* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
757 TARGET_ASM_FUNCTION_EPILOGUE. */
759 /* We need to say that the epilogue uses the return address, so the
760 initial-value machinery restores it. FIXME: Some targets
761 conditionalize on "reload_completed &&". Investigate difference.
762 FIXME: Not needed if nonlocal_goto_stack_level. */
763 #define EPILOGUE_USES(REGNO) \
764 ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
766 /* Node: Profiling */
767 #define FUNCTION_PROFILER(FILE, LABELNO) \
768 mmix_function_profiler (FILE, LABELNO)
770 /* Node: Trampolines */
772 #define TRAMPOLINE_TEMPLATE(FILE) \
773 mmix_trampoline_template (FILE)
775 #define TRAMPOLINE_SIZE mmix_trampoline_size
776 #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, STATIC_CHAIN) \
777 mmix_initialize_trampoline (ADDR, FNADDR, STATIC_CHAIN)
780 /* Node: Addressing Modes */
782 #define CONSTANT_ADDRESS_P(X) \
783 mmix_constant_address_p (X)
785 #define MAX_REGS_PER_ADDRESS 2
787 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL) \
788 if (mmix_legitimate_address (MODE, X, MMIX_REG_OK_STRICT)) \
791 #ifndef REG_OK_STRICT
792 # define REG_OK_FOR_BASE_P(X) \
793 (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \
794 || REGNO (X) == MMIX_ARG_POINTER_REGNUM \
795 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
797 # define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
798 #endif /* REG_OK_STRICT */
800 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
802 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL)
804 #define LEGITIMATE_CONSTANT_P(X) \
805 mmix_legitimate_constant_p (X)
808 /* Node: Condition Code */
810 #define SELECT_CC_MODE(OP, X, Y) \
811 mmix_select_cc_mode (OP, X, Y)
813 /* A definition of CANONICALIZE_COMPARISON that changed LE and GT
814 comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU
815 comparisons with 256 to 255 and LE, LEU, GT and GTU has been
816 ineffective; the code path for performing the changes did not trig for
817 neither the GCC testsuite nor ghostscript-6.52 nor Knuth's mmix.tar.gz
818 itself (core GCC functionality supposedly handling it) with sources
821 #define REVERSIBLE_CC_MODE(MODE) \
822 mmix_reversible_cc_mode (MODE)
827 /* The special registers can only move to and from general regs, and we
828 need to check that their constraints match, so say 3 for them. */
829 /* WARNING: gcc-2.7.2.2 i686-pc-linux-gnulibc1 (as shipped with RH 4.2)
830 miscompiles reload1.c:reload_cse_simplify_set; a call to
831 reload_cse_regno_equal_p is missing when checking if a substitution of
832 a register setting is valid if this is defined to just the expression
833 in mmix_register_move_cost.
835 Symptom: a (all?) register setting is optimized away for e.g.
836 "char *p1(char *p) { return p+1; }" and the value of register zero ($0)
839 We can workaround by making this a function call - unknown if this
840 causes dire speed effects. */
841 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
842 mmix_register_move_cost (MODE, FROM, TO)
844 #define SLOW_BYTE_ACCESS 0
849 /* This must be a constant string, since it's used in crtstuff.c. */
850 #define TEXT_SECTION_ASM_OP \
851 "\t.text ! mmixal:= 9H LOC 8B"
853 /* FIXME: Not documented. */
854 #define DATA_SECTION_ASM_OP \
855 mmix_data_section_asm_op ()
857 #define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata"
863 /* Node: File Framework */
865 /* While any other punctuation character but ";" would do, we prefer "%"
866 or "!"; "!" is an unary operator and so will not be mistakenly included
867 in correctly formed expressions. The hash character adds mass; catches
868 the eye. We can't have it as a comment char by itself, since it's a
869 hex-number prefix. */
870 #define ASM_COMMENT_START "!#"
872 /* These aren't currently functional. We just keep them as markers. */
873 #define ASM_APP_ON "%APP\n"
874 #define ASM_APP_OFF "%NO_APP\n"
876 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
877 mmix_asm_output_source_filename (STREAM, NAME)
879 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
880 mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
882 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
884 /* Node: Data Output */
886 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
887 mmix_asm_output_ascii (STREAM, PTR, LEN)
889 /* Node: Uninitialized Data */
891 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
892 mmix_asm_output_aligned_common (ST, N, S, A)
894 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
895 mmix_asm_output_aligned_local (ST, N, S, A)
898 /* Node: Label Output */
900 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
901 mmix_asm_output_label (STREAM, NAME)
903 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
904 mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
906 #define GLOBAL_ASM_OP "\t.global "
908 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
909 mmix_asm_weaken_label (STREAM, NAME)
911 #define MAKE_DECL_ONE_ONLY(DECL) \
912 mmix_make_decl_one_only (DECL)
914 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
915 mmix_asm_output_labelref (STREAM, NAME)
917 /* We insert a ":" to disambiguate against user symbols like L5. */
918 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
919 sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
921 /* Insert "::"; these are rarer than internal labels. FIXME: Make sure no
922 ":" is seen in the object file; we don't really want that mmixal
923 feature visible there. We don't want the default, which uses a dot;
924 that'd be incompatible with mmixal. */
925 #define ASM_PN_FORMAT "%s::%lu"
927 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
928 mmix_asm_output_def (STREAM, NAME, VALUE)
930 /* Node: Macros for Initialization */
931 /* We're compiling to ELF and linking to MMO; fundamental ELF features
932 that GCC depend on are there. */
934 /* These must be constant strings, since they're used in crtstuff.c. */
935 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
937 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
939 #define OBJECT_FORMAT_ELF
942 /* Node: Instruction Output */
944 /* The non-$ register names must be prefixed with ":", since they're
945 affected by PREFIX. We provide the non-colon names as additional
947 #define REGISTER_NAMES \
948 {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7", \
949 "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", \
950 "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23", \
951 "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31", \
952 "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39", \
953 "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47", \
954 "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55", \
955 "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63", \
956 "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71", \
957 "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79", \
958 "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87", \
959 "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95", \
960 "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103", \
961 "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111", \
962 "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119", \
963 "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127", \
964 "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135", \
965 "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143", \
966 "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151", \
967 "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159", \
968 "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167", \
969 "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175", \
970 "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183", \
971 "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191", \
972 "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199", \
973 "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207", \
974 "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215", \
975 "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223", \
976 "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231", \
977 "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239", \
978 "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247", \
979 "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255", \
980 ":rD", ":rE", ":rH", ":rJ", ":rR", "ap_!BAD!", ":rO"}
982 #define ADDITIONAL_REGISTER_NAMES \
983 {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257}, \
984 {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}, {"rO", MMIX_rO_REGNUM}}
986 #define PRINT_OPERAND(STREAM, X, CODE) \
987 mmix_print_operand (STREAM, X, CODE)
989 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
990 mmix_print_operand_punct_valid_p (CODE)
992 #define PRINT_OPERAND_ADDRESS(STREAM, X) \
993 mmix_print_operand_address (STREAM, X)
995 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
996 mmix_asm_output_reg_push (STREAM, REGNO)
998 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
999 mmix_asm_output_reg_pop (STREAM, REGNO)
1002 /* Node: Dispatch Tables */
1004 /* We define both types, since SImode is the better, but DImode the only
1005 possible for mmixal so that's the one actually used. */
1006 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
1007 mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
1009 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
1010 mmix_asm_output_addr_vec_elt (STREAM, VALUE)
1013 /* Node: Exception Region Output */
1016 /* Node: Alignment Output */
1018 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
1019 mmix_asm_output_skip (STREAM, NBYTES)
1021 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
1022 mmix_asm_output_align (STREAM, POWER)
1025 /* Node: All Debuggers */
1027 #define DBX_REGISTER_NUMBER(REGNO) \
1028 mmix_dbx_register_number (REGNO)
1031 /* Node: DBX Options */
1033 /* Node: DBX Hooks */
1035 /* Node: File Names and DBX */
1039 /* Node: SDB and DWARF */
1040 #define DWARF2_DEBUGGING_INFO 1
1041 #define DWARF2_ASM_LINE_DEBUG_INFO 1
1045 #define PREDICATE_CODES \
1046 {"mmix_reg_cc_operand", {SUBREG, REG}}, \
1047 {"mmix_foldable_comparison_operator", \
1048 {NE, EQ, GE, GT, LE, LT}}, \
1049 /* All '<', actually. */ \
1050 {"mmix_comparison_operator", \
1051 {NE, EQ, GE, GT, LE, LT, GEU, GTU, LEU, \
1052 LTU, UNORDERED, ORDERED, UNEQ, UNGE, UNLE, \
1054 {"mmix_symbolic_or_address_operand", \
1055 {SYMBOL_REF, LABEL_REF, CONST, \
1056 SUBREG, REG, PLUS}}, \
1057 {"mmix_reg_or_constant_operand", \
1058 {CONST_INT, CONST_DOUBLE, SUBREG, REG}}, \
1059 {"mmix_reg_or_8bit_operand", \
1060 {CONST_INT, CONST_DOUBLE, SUBREG, REG}}, \
1061 {"mmix_reg_or_0_operand", \
1062 {CONST_INT, CONST_DOUBLE, SUBREG, REG}},
1064 #define SPECIAL_MODE_PREDICATES "mmix_symbolic_or_address_operand",
1066 /* There's no way to get a PC-relative offset into tables for SImode, so
1067 for the moment we have absolute entries in DImode.
1068 When we're going ELF, these should be SImode and 1. */
1069 #define CASE_VECTOR_MODE DImode
1070 #define CASE_VECTOR_PC_RELATIVE 0
1072 #define WORD_REGISTER_OPERATIONS
1074 /* We have a choice, which makes this yet another parameter to tweak. The
1075 gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
1076 than "unsigned int", and we have signed characters. FIXME: measure. */
1077 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
1081 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1083 /* ??? MMIX allows a choice of STORE_FLAG_VALUE. Revisit later,
1084 we don't have scc expanders yet. */
1086 #define Pmode DImode
1088 #define FUNCTION_MODE QImode
1090 #define NO_IMPLICIT_EXTERN_C
1092 #define HANDLE_SYSV_PRAGMA 1
1094 /* These are checked. */
1095 #define DOLLARS_IN_IDENTIFIERS 0
1096 #define NO_DOLLAR_IN_LABEL
1097 #define NO_DOT_IN_LABEL
1099 #endif /* GCC_MMIX_H */
1102 * eval: (c-set-style "gnu")
1103 * indent-tabs-mode: t