1 /* Definitions of target machine for GNU compiler, for MMIX.
2 Copyright (C) 2000, 2001, 2002, 2004, 2005, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Hans-Peter Nilsson (hp@bitrange.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
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 /* Per-function machine data. This is normally an opaque type just
85 defined and used in the tm.c file, but we need to see the definition in
87 struct GTY(()) machine_function
90 int highest_saved_stack_register;
94 /* For these target macros, there is no generic documentation here. You
95 should read `Using and Porting GCC' for that. Only comments specific
96 to the MMIX target are here.
98 There are however references to the specific texinfo node (comments
99 with "Node:"), so there should be little or nothing amiss. Probably
100 the opposite, since we don't have to care about old littering and
101 soon outdated generic comments. */
105 /* User symbols are in the same name-space as built-in symbols, but we
106 don't need the built-in symbols, so remove those and instead apply
107 stricter operand checking. Don't warn when expanding insns. */
108 #define ASM_SPEC "-no-predefined-syms -x"
110 /* Pass on -mset-program-start=N and -mset-data-start=M to the linker.
111 Provide default program start 0x100 unless -mno-set-program-start.
112 Don't do this if linking relocatably, with -r. For a final link,
113 produce mmo, unless ELF is requested or when linking relocatably. */
115 "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\
116 %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\
117 %{!mset-program-start=*:\
118 %{!mno-set-program-start:\
119 %{!r:--defsym __.MMIX.start..text=0x100}}}\
120 %{!melf:%{!r:-m mmo}}%{melf|r:-m elf64mmix}"
122 /* FIXME: There's no provision for profiling here. */
123 #define STARTFILE_SPEC \
124 "crti%O%s crtbegin%O%s"
126 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
128 /* Node: Run-time Target */
130 /* Define __LONG_MAX__, since we're advised not to change glimits.h. */
131 #define TARGET_CPU_CPP_BUILTINS() \
134 builtin_define ("__mmix__"); \
135 builtin_define ("__MMIX__"); \
136 if (TARGET_ABI_GNU) \
137 builtin_define ("__MMIX_ABI_GNU__"); \
139 builtin_define ("__MMIX_ABI_MMIXWARE__"); \
143 extern int target_flags;
145 #define TARGET_DEFAULT \
146 (MASK_BRANCH_PREDICT | MASK_BASE_ADDRESSES | MASK_USE_RETURN_INSN)
148 /* Unfortunately, this must not reference anything in "mmix.c". */
149 #define TARGET_VERSION \
150 fprintf (stderr, " (MMIX)")
152 #define OVERRIDE_OPTIONS mmix_override_options ()
154 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE) \
158 flag_regmove = TRUE; \
160 if (SIZE || LEVEL > 1) \
162 flag_omit_frame_pointer = TRUE; \
167 /* This one will have to wait a little bit; right now we can't debug
168 neither with or without a frame-pointer. */
169 /* #define CAN_DEBUG_WITHOUT_FP */
172 /* Node: Per-Function Data */
173 #define INIT_EXPANDERS mmix_init_expanders ()
176 /* Node: Storage Layout */
177 /* I see no bit-field instructions. Anyway, the common order is from low
178 to high, as the power of two, hence little-endian. */
179 #define BITS_BIG_ENDIAN 0
180 #define BYTES_BIG_ENDIAN 1
181 #define WORDS_BIG_ENDIAN 1
182 #define FLOAT_WORDS_BIG_ENDIAN 1
183 #define UNITS_PER_WORD 8
185 /* We need to align everything to 64 bits that can affect the alignment
186 of other types. Since address N is interpreted in MMIX as (N modulo
187 access_size), we must align. */
188 #define PARM_BOUNDARY 64
189 #define STACK_BOUNDARY 64
190 #define FUNCTION_BOUNDARY 32
191 #define BIGGEST_ALIGNMENT 64
193 /* This one is only used in the ADA front end. */
194 #define MINIMUM_ATOMIC_ALIGNMENT 8
196 /* Copied from elfos.h. */
197 #define MAX_OFILE_ALIGNMENT (32768 * 8)
199 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
200 mmix_data_alignment (TYPE, BASIC_ALIGN)
202 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
203 mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
205 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
206 mmix_local_alignment (TYPE, BASIC_ALIGN)
208 /* Following other ports, this seems to most commonly be the word-size,
209 so let's do that here too. */
210 #define EMPTY_FIELD_BOUNDARY 64
212 /* We chose to have this low solely for similarity with the alpha. It has
213 nothing to do with passing the tests dg/c99-scope-2 and
214 execute/align-1.c. Nothing. Though the tests seem wrong. Padding of
215 the structure is automatically added to get alignment when needed if we
216 set this to just byte-boundary. */
217 #define STRUCTURE_SIZE_BOUNDARY 8
219 /* The lower bits are ignored. */
220 #define STRICT_ALIGNMENT 1
223 /* Node: Type Layout */
225 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
226 but then an occasional MMIX programmer needs to know how to put a lot
227 of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
228 than the "intuitive" char, short and int types. */
229 #define INT_TYPE_SIZE 32
230 #define SHORT_TYPE_SIZE 16
231 #define LONG_LONG_TYPE_SIZE 64
233 #define FLOAT_TYPE_SIZE 32
234 #define DOUBLE_TYPE_SIZE 64
235 #define LONG_DOUBLE_TYPE_SIZE 64
237 #define DEFAULT_SIGNED_CHAR 1
240 /* Node: Register Basics */
241 /* We tell GCC about all 256 general registers, and we also include
242 rD, rE, rH, rJ, rR and rO (in that order) so we can describe what insns
243 clobber them. We use a faked register for the argument pointer. It is
244 always eliminated towards the frame-pointer or the stack-pointer, never
245 output in assembly. Any fixed register would do for this, like $255,
246 but future debugging is easier when using a separate register. It
247 counts as a global register for pseudorandom reasons. */
248 #define FIRST_PSEUDO_REGISTER 263
250 /* We treat general registers with no assigned purpose as fixed. The
251 stack pointer, $254, is also fixed. Register $255 is referred to as a
252 temporary register in the MMIX papers, and used as such in mmixal, so
253 it should not be used as a stack pointer. We set it to fixed, and use
254 it "manually" at times of despair. */
255 #define FIXED_REGISTERS \
256 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
257 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
258 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
259 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
260 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
261 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
262 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
263 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
264 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
265 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
266 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
267 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
268 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
269 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
270 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
271 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
272 1, 1, 0, 0, 0, 1, 1 \
275 /* General registers are fixed and therefore "historically" marked
276 call-used. (FIXME: This has changed). Registers $15..$31 are
277 call-clobbered; we'll put arguments in $16 and up, and we need $15 for
278 the MMIX register-stack "hole". */
279 #define CALL_USED_REGISTERS \
280 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, \
281 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
282 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
283 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
284 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
285 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
286 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
287 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
288 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
289 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
290 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
291 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
292 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
293 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
294 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
295 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, \
296 1, 1, 1, 1, 1, 1, 1 \
299 #define CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage ()
301 #define INCOMING_REGNO(OUT) mmix_opposite_regno (OUT, 0)
303 #define OUTGOING_REGNO(IN) mmix_opposite_regno (IN, 1)
305 /* Defining LOCAL_REGNO is necessary in presence of prologue/epilogue,
306 else GCC will be confused that those registers aren't saved and
308 #define LOCAL_REGNO(REGNO) mmix_local_regno (REGNO)
310 /* Node: Allocation Order */
312 /* We should allocate registers from 0 to 31 by increasing number, because
313 I think that's what people expect. Beyond that, just use
314 call-clobbered global registers first, then call-clobbered special
315 registers. Last, the fixed registers. */
316 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER \
317 { 0, 1, 2, 3, 4, 5, 6, 7, \
318 8, 9, 10, 11, 12, 13, 14, 15, \
319 16, 17, 18, 19, 20, 21, 22, 23, \
320 24, 25, 26, 27, 28, 29, 30, 31, \
322 252, 251, 250, 249, 248, 247, \
328 32, 33, 34, 35, 36, 37, 38, 39, \
329 40, 41, 42, 43, 44, 45, 46, 47, \
330 48, 49, 50, 51, 52, 53, 54, 55, \
331 56, 57, 58, 59, 60, 61, 62, 63, \
332 64, 65, 66, 67, 68, 69, 70, 71, \
333 72, 73, 74, 75, 76, 77, 78, 79, \
334 80, 81, 82, 83, 84, 85, 86, 87, \
335 88, 89, 90, 91, 92, 93, 94, 95, \
336 96, 97, 98, 99, 100, 101, 102, 103, \
337 104, 105, 106, 107, 108, 109, 110, 111, \
338 112, 113, 114, 115, 116, 117, 118, 119, \
339 120, 121, 122, 123, 124, 125, 126, 127, \
340 128, 129, 130, 131, 132, 133, 134, 135, \
341 136, 137, 138, 139, 140, 141, 142, 143, \
342 144, 145, 146, 147, 148, 149, 150, 151, \
343 152, 153, 154, 155, 156, 157, 158, 159, \
344 160, 161, 162, 163, 164, 165, 166, 167, \
345 168, 169, 170, 171, 172, 173, 174, 175, \
346 176, 177, 178, 179, 180, 181, 182, 183, \
347 184, 185, 186, 187, 188, 189, 190, 191, \
348 192, 193, 194, 195, 196, 197, 198, 199, \
349 200, 201, 202, 203, 204, 205, 206, 207, \
350 208, 209, 210, 211, 212, 213, 214, 215, \
351 216, 217, 218, 219, 220, 221, 222, 223, \
352 224, 225, 226, 227, 228, 229, 230, 231, \
353 232, 233, 234, 235, 236, 237, 238, 239, \
354 240, 241, 242, 243, 244, 245, 246, \
356 254, 255, 256, 257, 261, 262 \
359 /* As a convenience, we put this nearby, for ease of comparison.
360 First, call-clobbered registers in reverse order of assignment as
361 parameters (also the top ones; not because they're parameters, but
364 Second, saved registers that go on the register-stack.
366 Third, special registers rH, rR and rJ. They should not normally be
367 allocated, but since they're call-clobbered, it is cheaper to use one
368 of them than using a call-saved register for a call-clobbered use,
369 assuming it is referenced a very limited number of times. Other global
370 and fixed registers come next; they are never allocated. */
371 #define MMIX_GNU_ABI_REG_ALLOC_ORDER \
372 { 252, 251, 250, 249, 248, 247, 246, \
373 245, 244, 243, 242, 241, 240, 239, 238, \
374 237, 236, 235, 234, 233, 232, 231, \
376 0, 1, 2, 3, 4, 5, 6, 7, \
377 8, 9, 10, 11, 12, 13, 14, 15, \
378 16, 17, 18, 19, 20, 21, 22, 23, \
379 24, 25, 26, 27, 28, 29, 30, 31, \
385 32, 33, 34, 35, 36, 37, 38, 39, \
386 40, 41, 42, 43, 44, 45, 46, 47, \
387 48, 49, 50, 51, 52, 53, 54, 55, \
388 56, 57, 58, 59, 60, 61, 62, 63, \
389 64, 65, 66, 67, 68, 69, 70, 71, \
390 72, 73, 74, 75, 76, 77, 78, 79, \
391 80, 81, 82, 83, 84, 85, 86, 87, \
392 88, 89, 90, 91, 92, 93, 94, 95, \
393 96, 97, 98, 99, 100, 101, 102, 103, \
394 104, 105, 106, 107, 108, 109, 110, 111, \
395 112, 113, 114, 115, 116, 117, 118, 119, \
396 120, 121, 122, 123, 124, 125, 126, 127, \
397 128, 129, 130, 131, 132, 133, 134, 135, \
398 136, 137, 138, 139, 140, 141, 142, 143, \
399 144, 145, 146, 147, 148, 149, 150, 151, \
400 152, 153, 154, 155, 156, 157, 158, 159, \
401 160, 161, 162, 163, 164, 165, 166, 167, \
402 168, 169, 170, 171, 172, 173, 174, 175, \
403 176, 177, 178, 179, 180, 181, 182, 183, \
404 184, 185, 186, 187, 188, 189, 190, 191, \
405 192, 193, 194, 195, 196, 197, 198, 199, \
406 200, 201, 202, 203, 204, 205, 206, 207, \
407 208, 209, 210, 211, 212, 213, 214, 215, \
408 216, 217, 218, 219, 220, 221, 222, 223, \
409 224, 225, 226, 227, 228, 229, 230, \
411 254, 255, 256, 257, 261, 262 \
414 /* The default one. */
415 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
417 /* Node: Values in Registers */
419 #define HARD_REGNO_NREGS(REGNO, MODE) \
420 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) \
423 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
425 /* Note that no register can really be accessed in single-float mode, so
426 we *can* say 1 here. FIXME: Will TRT happen for single-float, or do
427 we have to punt to libgcc1.asm? */
428 #define MODES_TIEABLE_P(MODE1, MODE2) 1
431 /* Node: Leaf Functions */
435 /* Node: Register Classes */
439 NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
440 SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
443 #define N_REG_CLASSES (int) LIM_REG_CLASSES
445 #define REG_CLASS_NAMES \
446 {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG", \
447 "SYSTEM_REGS", "ALL_REGS"}
449 /* Note that the contents of each item is always 32 bits. */
450 #define REG_CLASS_CONTENTS \
451 {{0, 0, 0, 0, 0, 0, 0, 0, 0}, \
452 {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20}, \
453 {0, 0, 0, 0, 0, 0, 0, 0, 0x10}, \
454 {0, 0, 0, 0, 0, 0, 0, 0, 4}, \
455 {0, 0, 0, 0, 0, 0, 0, 0, 0x7f}, \
456 {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x7f}}
458 #define REGNO_REG_CLASS(REGNO) \
459 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER \
460 || (REGNO) == MMIX_ARG_POINTER_REGNUM \
462 : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG \
463 : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
465 #define BASE_REG_CLASS GENERAL_REGS
467 #define INDEX_REG_CLASS GENERAL_REGS
469 #define REG_CLASS_FROM_LETTER(CHAR) \
470 ((CHAR) == 'x' ? SYSTEM_REGS \
471 : (CHAR) == 'y' ? REMAINDER_REG \
472 : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
474 #define REGNO_OK_FOR_BASE_P(REGNO) \
475 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER \
476 || (REGNO) == MMIX_ARG_POINTER_REGNUM \
477 || (reg_renumber[REGNO] > 0 \
478 && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
480 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
482 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
483 mmix_preferred_reload_class (X, CLASS)
485 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
486 mmix_preferred_output_reload_class (X, CLASS)
488 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
489 mmix_secondary_reload_class (CLASS, MODE, X, 1)
491 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
492 mmix_secondary_reload_class (CLASS, MODE, X, 0)
494 #define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
496 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
497 mmix_const_ok_for_letter_p (VALUE, C)
499 #define EXTRA_CONSTRAINT(VALUE, C) \
500 mmix_extra_constraint (VALUE, C, MMIX_REG_OK_STRICT)
502 /* Do we need anything serious here? Yes, any FLOT constant. */
503 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) \
504 mmix_const_double_ok_for_letter_p (VALUE, C)
507 /* Node: Frame Layout */
509 #define STACK_GROWS_DOWNWARD
510 #define FRAME_GROWS_DOWNWARD 1
512 #define STARTING_FRAME_OFFSET \
513 mmix_starting_frame_offset ()
515 #define FIRST_PARM_OFFSET(FUNDECL) 0
517 #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
518 mmix_dynamic_chain_address (FRAMEADDR)
520 /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented. */
522 #define SETUP_FRAME_ADDRESSES() \
523 mmix_setup_frame_addresses ()
525 #define RETURN_ADDR_RTX(COUNT, FRAME) \
526 mmix_return_addr_rtx (COUNT, FRAME)
528 /* It's in rJ before we store it somewhere. */
529 #define INCOMING_RETURN_ADDR_RTX \
530 gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
532 /* FIXME: This does not seem properly documented or cross-indexed.
533 Nowhere except in the code does it say it *has* to be in the range
534 0..255, or else it will be truncated. That goes for the default too. */
535 #define DWARF_FRAME_RETURN_COLUMN \
536 DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
538 /* No return address is stored there. */
539 #define INCOMING_FRAME_SP_OFFSET 0
541 /* Node: Stack Checking */
545 /* Node: Exception Handling */
547 #define EH_RETURN_DATA_REGNO(N) \
548 mmix_eh_return_data_regno (N)
550 #define EH_RETURN_STACKADJ_RTX \
551 mmix_eh_return_stackadj_rtx ()
553 #define EH_RETURN_HANDLER_RTX \
554 mmix_eh_return_handler_rtx ()
556 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
557 mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
559 /* Node: Frame Registers */
560 #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
562 /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
563 what register we want to use. */
564 #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
565 #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
567 #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
570 /* Node: Elimination */
572 /* The frame-pointer is stored in a location that either counts to the
573 offset of incoming parameters, or that counts to the offset of the
574 frame, so we can't use a single offset. We therefore eliminate those
576 #define ELIMINABLE_REGS \
577 {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
578 {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \
579 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
581 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
582 (OFFSET) = mmix_initial_elimination_offset (FROM, TO)
585 /* Node: Stack Arguments */
587 #define ACCUMULATE_OUTGOING_ARGS 1
589 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
592 /* Node: Register Arguments */
593 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
594 mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 0)
596 #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED) \
597 mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 1)
599 typedef struct { int regs; int lib; } CUMULATIVE_ARGS;
601 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
602 ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0))
604 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
606 = ((targetm.calls.must_pass_in_stack (MODE, TYPE)) \
607 || (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE) > 8 \
608 && !TARGET_LIBFUNC && !(CUM).lib)) \
609 ? (MMIX_MAX_ARGS_IN_REGS) + 1 \
610 : (CUM).regs + (7 + (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE))) / 8)
612 #define FUNCTION_ARG_REGNO_P(REGNO) \
613 mmix_function_arg_regno_p (REGNO, 0)
616 /* Node: Caller Saves */
620 /* Node: Function Entry */
622 /* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
623 TARGET_ASM_FUNCTION_EPILOGUE. */
625 /* We need to say that the epilogue uses the return address, so the
626 initial-value machinery restores it. FIXME: Some targets
627 conditionalize on "reload_completed &&". Investigate difference.
628 FIXME: Not needed if nonlocal_goto_stack_level. */
629 #define EPILOGUE_USES(REGNO) \
630 ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
632 /* Node: Profiling */
633 #define FUNCTION_PROFILER(FILE, LABELNO) \
634 mmix_function_profiler (FILE, LABELNO)
636 /* Node: Trampolines */
638 #define TRAMPOLINE_SIZE (4*UNITS_PER_WORD)
639 #define TRAMPOLINE_ALIGNMENT BITS_PER_WORD
641 /* Node: Addressing Modes */
643 #define CONSTANT_ADDRESS_P(X) \
644 mmix_constant_address_p (X)
646 #define MAX_REGS_PER_ADDRESS 2
648 #ifndef REG_OK_STRICT
649 # define REG_OK_FOR_BASE_P(X) \
650 (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \
651 || REGNO (X) == MMIX_ARG_POINTER_REGNUM \
652 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
654 # define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
655 #endif /* REG_OK_STRICT */
657 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
659 #define LEGITIMATE_CONSTANT_P(X) \
660 mmix_legitimate_constant_p (X)
663 /* Node: Condition Code */
665 #define SELECT_CC_MODE(OP, X, Y) \
666 mmix_select_cc_mode (OP, X, Y)
668 /* A definition of CANONICALIZE_COMPARISON that changed LE and GT
669 comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU
670 comparisons with 256 to 255 and LE, LEU, GT and GTU has been
671 ineffective; the code path for performing the changes did not trig for
672 neither the GCC testsuite nor ghostscript-6.52 nor Knuth's mmix.tar.gz
673 itself (core GCC functionality supposedly handling it) with sources
676 #define REVERSIBLE_CC_MODE(MODE) \
677 mmix_reversible_cc_mode (MODE)
682 /* The special registers can only move to and from general regs, and we
683 need to check that their constraints match, so say 3 for them. */
684 /* WARNING: gcc-2.7.2.2 i686-pc-linux-gnulibc1 (as shipped with RH 4.2)
685 miscompiles reload1.c:reload_cse_simplify_set; a call to
686 reload_cse_regno_equal_p is missing when checking if a substitution of
687 a register setting is valid if this is defined to just the expression
688 in mmix_register_move_cost.
690 Symptom: a (all?) register setting is optimized away for e.g.
691 "char *p1(char *p) { return p+1; }" and the value of register zero ($0)
694 We can workaround by making this a function call - unknown if this
695 causes dire speed effects. */
696 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
697 mmix_register_move_cost (MODE, FROM, TO)
699 #define SLOW_BYTE_ACCESS 0
704 /* This must be a constant string, since it's used in crtstuff.c. */
705 #define TEXT_SECTION_ASM_OP \
706 "\t.text ! mmixal:= 9H LOC 8B"
708 /* FIXME: Not documented. */
709 #define DATA_SECTION_ASM_OP \
710 mmix_data_section_asm_op ()
712 #define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata"
718 /* Node: File Framework */
720 /* While any other punctuation character but ";" would do, we prefer "%"
721 or "!"; "!" is an unary operator and so will not be mistakenly included
722 in correctly formed expressions. The hash character adds mass; catches
723 the eye. We can't have it as a comment char by itself, since it's a
724 hex-number prefix. */
725 #define ASM_COMMENT_START "!#"
727 /* These aren't currently functional. We just keep them as markers. */
728 #define ASM_APP_ON "%APP\n"
729 #define ASM_APP_OFF "%NO_APP\n"
731 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
732 mmix_asm_output_source_filename (STREAM, NAME)
734 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
735 mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
737 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
739 /* Node: Data Output */
741 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
742 mmix_asm_output_ascii (STREAM, PTR, LEN)
744 /* Node: Uninitialized Data */
746 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
747 mmix_asm_output_aligned_common (ST, N, S, A)
749 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
750 mmix_asm_output_aligned_local (ST, N, S, A)
753 /* Node: Label Output */
755 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
756 mmix_asm_output_label (STREAM, NAME)
758 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, NAME) \
759 mmix_asm_output_internal_label (STREAM, NAME)
761 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
762 mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
764 #define GLOBAL_ASM_OP "\t.global "
766 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
767 mmix_asm_weaken_label (STREAM, NAME)
769 #define MAKE_DECL_ONE_ONLY(DECL) \
770 mmix_make_decl_one_only (DECL)
772 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
773 mmix_asm_output_labelref (STREAM, NAME)
775 /* We insert a ":" to disambiguate against user symbols like L5. */
776 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
777 sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
779 /* Insert "::"; these are rarer than internal labels. FIXME: Make sure no
780 ":" is seen in the object file; we don't really want that mmixal
781 feature visible there. We don't want the default, which uses a dot;
782 that'd be incompatible with mmixal. */
783 #define ASM_PN_FORMAT "%s::%lu"
785 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
786 mmix_asm_output_def (STREAM, NAME, VALUE)
788 /* Node: Macros for Initialization */
789 /* We're compiling to ELF and linking to MMO; fundamental ELF features
790 that GCC depend on are there. */
792 /* These must be constant strings, since they're used in crtstuff.c. */
793 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
795 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
797 #define OBJECT_FORMAT_ELF
800 /* Node: Instruction Output */
802 /* The non-$ register names must be prefixed with ":", since they're
803 affected by PREFIX. We provide the non-colon names as additional
805 #define REGISTER_NAMES \
806 {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7", \
807 "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", \
808 "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23", \
809 "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31", \
810 "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39", \
811 "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47", \
812 "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55", \
813 "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63", \
814 "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71", \
815 "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79", \
816 "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87", \
817 "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95", \
818 "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103", \
819 "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111", \
820 "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119", \
821 "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127", \
822 "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135", \
823 "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143", \
824 "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151", \
825 "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159", \
826 "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167", \
827 "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175", \
828 "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183", \
829 "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191", \
830 "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199", \
831 "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207", \
832 "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215", \
833 "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223", \
834 "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231", \
835 "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239", \
836 "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247", \
837 "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255", \
838 ":rD", ":rE", ":rH", ":rJ", ":rR", "ap_!BAD!", ":rO"}
840 #define ADDITIONAL_REGISTER_NAMES \
841 {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257}, \
842 {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}, {"rO", MMIX_rO_REGNUM}}
844 #define PRINT_OPERAND(STREAM, X, CODE) \
845 mmix_print_operand (STREAM, X, CODE)
847 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
848 mmix_print_operand_punct_valid_p (CODE)
850 #define PRINT_OPERAND_ADDRESS(STREAM, X) \
851 mmix_print_operand_address (STREAM, X)
853 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
854 mmix_asm_output_reg_push (STREAM, REGNO)
856 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
857 mmix_asm_output_reg_pop (STREAM, REGNO)
860 /* Node: Dispatch Tables */
862 /* We define both types, since SImode is the better, but DImode the only
863 possible for mmixal so that's the one actually used. */
864 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
865 mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
867 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
868 mmix_asm_output_addr_vec_elt (STREAM, VALUE)
871 /* Node: Exception Region Output */
874 /* Node: Alignment Output */
876 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
877 mmix_asm_output_skip (STREAM, NBYTES)
879 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
880 mmix_asm_output_align (STREAM, POWER)
883 /* Node: All Debuggers */
885 #define DBX_REGISTER_NUMBER(REGNO) \
886 mmix_dbx_register_number (REGNO)
889 /* Node: DBX Options */
891 /* Node: DBX Hooks */
893 /* Node: File Names and DBX */
897 /* Node: SDB and DWARF */
898 #define DWARF2_DEBUGGING_INFO 1
899 #define DWARF2_ASM_LINE_DEBUG_INFO 1
903 /* There's no way to get a PC-relative offset into tables for SImode, so
904 for the moment we have absolute entries in DImode.
905 When we're going ELF, these should be SImode and 1. */
906 #define CASE_VECTOR_MODE DImode
907 #define CASE_VECTOR_PC_RELATIVE 0
909 #define WORD_REGISTER_OPERATIONS
911 /* We have a choice, which makes this yet another parameter to tweak. The
912 gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
913 than "unsigned int", and we have signed characters. FIXME: measure. */
914 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
918 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
920 /* ??? MMIX allows a choice of STORE_FLAG_VALUE. Revisit later,
921 we don't have scc expanders yet. */
925 #define FUNCTION_MODE QImode
927 #define NO_IMPLICIT_EXTERN_C
929 #define HANDLE_SYSV_PRAGMA 1
931 /* These are checked. */
932 #define DOLLARS_IN_IDENTIFIERS 0
933 #define NO_DOLLAR_IN_LABEL
934 #define NO_DOT_IN_LABEL
936 #endif /* GCC_MMIX_H */
939 * eval: (c-set-style "gnu")
940 * indent-tabs-mode: t