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68cbb7e3 | 1 | /* Definitions of target machine for GNU compiler, for MMIX. |
f38f90bf | 2 | Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc. |
68cbb7e3 | 3 | Contributed by Hans-Peter Nilsson (hp@bitrange.com) |
4 | ||
581084df | 5 | This file is part of GCC. |
68cbb7e3 | 6 | |
581084df | 7 | GCC is free software; you can redistribute it and/or modify |
68cbb7e3 | 8 | it under the terms of the GNU General Public License as published by |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
581084df | 12 | GCC is distributed in the hope that it will be useful, |
68cbb7e3 | 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
581084df | 18 | along with GCC; see the file COPYING. If not, write to |
68cbb7e3 | 19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "config.h" | |
23 | #include "system.h" | |
24 | #include "rtl.h" | |
25 | #include "regs.h" | |
26 | #include "hard-reg-set.h" | |
27 | #include "hashtab.h" | |
28 | #include "insn-config.h" | |
29 | #include "output.h" | |
30 | #include "flags.h" | |
31 | #include "tree.h" | |
32 | #include "function.h" | |
33 | #include "expr.h" | |
34 | #include "toplev.h" | |
35 | #include "recog.h" | |
36 | #include "ggc.h" | |
37 | #include "dwarf2.h" | |
38 | #include "debug.h" | |
39 | #include "tm_p.h" | |
40 | #include "integrate.h" | |
41 | #include "target.h" | |
42 | #include "target-def.h" | |
b744252f | 43 | #include "real.h" |
68cbb7e3 | 44 | |
45 | /* First some local helper definitions. */ | |
46 | #define MMIX_FIRST_GLOBAL_REGNUM 32 | |
47 | ||
48 | /* We'd need a current_function_has_landing_pad. It's marked as such when | |
49 | a nonlocal_goto_receiver is expanded. Not just a C++ thing, but | |
50 | mostly. */ | |
51 | #define MMIX_CFUN_HAS_LANDING_PAD (cfun->machine->has_landing_pad != 0) | |
52 | ||
53 | /* We have no means to tell DWARF 2 about the register stack, so we need | |
54 | to store the return address on the stack if an exception can get into | |
d3310704 | 55 | this function. FIXME: Narrow condition. Before any whole-function |
56 | analysis, regs_ever_live[] isn't initialized. We know it's up-to-date | |
57 | after reload_completed; it may contain incorrect information some time | |
58 | before that. Within a RTL sequence (after a call to start_sequence, | |
59 | such as in RTL expanders), leaf_function_p doesn't see all insns | |
60 | (perhaps any insn). But regs_ever_live is up-to-date when | |
61 | leaf_function_p () isn't, so we "or" them together to get accurate | |
62 | information. FIXME: Some tweak to leaf_function_p might be | |
63 | preferrable. */ | |
64 | #define MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS \ | |
65 | (flag_exceptions \ | |
66 | && ((reload_completed && regs_ever_live[MMIX_rJ_REGNUM]) \ | |
67 | || !leaf_function_p ())) | |
68cbb7e3 | 68 | |
69 | #define IS_MMIX_EH_RETURN_DATA_REG(REGNO) \ | |
70 | (current_function_calls_eh_return \ | |
71 | && (EH_RETURN_DATA_REGNO (0) == REGNO \ | |
72 | || EH_RETURN_DATA_REGNO (1) == REGNO \ | |
73 | || EH_RETURN_DATA_REGNO (2) == REGNO \ | |
74 | || EH_RETURN_DATA_REGNO (3) == REGNO)) | |
75 | ||
d68ffc6f | 76 | /* For the default ABI, we rename registers at output-time to fill the gap |
77 | between the (statically partitioned) saved registers and call-clobbered | |
78 | registers. In effect this makes unused call-saved registers to be used | |
79 | as call-clobbered registers. The benefit comes from keeping the number | |
80 | of local registers (value of rL) low, since there's a cost of | |
d3310704 | 81 | increasing rL and clearing unused (unset) registers with lower numbers. |
82 | Don't translate while outputting the prologue. */ | |
d68ffc6f | 83 | #define MMIX_OUTPUT_REGNO(N) \ |
84 | (TARGET_ABI_GNU \ | |
0b123c47 | 85 | || (int) (N) < MMIX_RETURN_VALUE_REGNUM \ |
86 | || (int) (N) > MMIX_LAST_STACK_REGISTER_REGNUM \ | |
d3310704 | 87 | || cfun == NULL \ |
88 | || cfun->machine == NULL \ | |
89 | || cfun->machine->in_prologue \ | |
d68ffc6f | 90 | ? (N) : ((N) - MMIX_RETURN_VALUE_REGNUM \ |
91 | + cfun->machine->highest_saved_stack_register + 1)) | |
92 | ||
0b123c47 | 93 | /* The %d in "POP %d,0". */ |
94 | #define MMIX_POP_ARGUMENT() \ | |
95 | ((! TARGET_ABI_GNU \ | |
96 | && current_function_return_rtx != NULL \ | |
97 | && ! current_function_returns_struct) \ | |
98 | ? (GET_CODE (current_function_return_rtx) == PARALLEL \ | |
99 | ? GET_NUM_ELEM (XVEC (current_function_return_rtx, 0)) : 1) \ | |
100 | : 0) | |
101 | ||
68cbb7e3 | 102 | /* The canonical saved comparison operands for non-cc0 machines, set in |
103 | the compare expander. */ | |
104 | rtx mmix_compare_op0; | |
105 | rtx mmix_compare_op1; | |
106 | ||
107 | /* We ignore some options with arguments. They are passed to the linker, | |
108 | but also ends up here because they start with "-m". We tell the driver | |
109 | to store them in a variable we don't inspect. */ | |
25037517 | 110 | const char *mmix_cc1_ignored_option; |
68cbb7e3 | 111 | |
112 | /* Declarations of locals. */ | |
113 | ||
68cbb7e3 | 114 | /* Intermediate for insn output. */ |
115 | static int mmix_output_destination_register; | |
116 | ||
117 | static void mmix_output_shiftvalue_op_from_str | |
118 | PARAMS ((FILE *, const char *, HOST_WIDEST_INT)); | |
119 | static void mmix_output_shifted_value PARAMS ((FILE *, HOST_WIDEST_INT)); | |
120 | static void mmix_output_condition PARAMS ((FILE *, rtx, int)); | |
121 | static HOST_WIDEST_INT mmix_intval PARAMS ((rtx)); | |
122 | static void mmix_output_octa PARAMS ((FILE *, HOST_WIDEST_INT, int)); | |
58356836 | 123 | static bool mmix_assemble_integer PARAMS ((rtx, unsigned int, int)); |
1f3233d1 | 124 | static struct machine_function * mmix_init_machine_status PARAMS ((void)); |
7811991d | 125 | static void mmix_encode_section_info PARAMS ((tree, int)); |
7b4a38a6 | 126 | static const char *mmix_strip_name_encoding PARAMS ((const char *)); |
d3310704 | 127 | static void mmix_emit_sp_add PARAMS ((HOST_WIDE_INT offset)); |
128 | static void mmix_target_asm_function_prologue | |
68cbb7e3 | 129 | PARAMS ((FILE *, HOST_WIDE_INT)); |
d3310704 | 130 | static void mmix_target_asm_function_end_prologue PARAMS ((FILE *)); |
131 | static void mmix_target_asm_function_epilogue | |
68cbb7e3 | 132 | PARAMS ((FILE *, HOST_WIDE_INT)); |
133 | ||
134 | ||
135 | /* Target structure macros. Listed by node. See `Using and Porting GCC' | |
136 | for a general description. */ | |
137 | ||
138 | /* Node: Function Entry */ | |
139 | ||
58356836 | 140 | #undef TARGET_ASM_BYTE_OP |
141 | #define TARGET_ASM_BYTE_OP NULL | |
142 | #undef TARGET_ASM_ALIGNED_HI_OP | |
143 | #define TARGET_ASM_ALIGNED_HI_OP NULL | |
144 | #undef TARGET_ASM_ALIGNED_SI_OP | |
145 | #define TARGET_ASM_ALIGNED_SI_OP NULL | |
146 | #undef TARGET_ASM_ALIGNED_DI_OP | |
147 | #define TARGET_ASM_ALIGNED_DI_OP NULL | |
148 | #undef TARGET_ASM_INTEGER | |
149 | #define TARGET_ASM_INTEGER mmix_assemble_integer | |
150 | ||
68cbb7e3 | 151 | #undef TARGET_ASM_FUNCTION_PROLOGUE |
152 | #define TARGET_ASM_FUNCTION_PROLOGUE mmix_target_asm_function_prologue | |
153 | ||
d3310704 | 154 | #undef TARGET_ASM_FUNCTION_END_PROLOGUE |
155 | #define TARGET_ASM_FUNCTION_END_PROLOGUE mmix_target_asm_function_end_prologue | |
156 | ||
68cbb7e3 | 157 | #undef TARGET_ASM_FUNCTION_EPILOGUE |
158 | #define TARGET_ASM_FUNCTION_EPILOGUE mmix_target_asm_function_epilogue | |
159 | ||
7811991d | 160 | #undef TARGET_ENCODE_SECTION_INFO |
161 | #define TARGET_ENCODE_SECTION_INFO mmix_encode_section_info | |
7b4a38a6 | 162 | #undef TARGET_STRIP_NAME_ENCODING |
163 | #define TARGET_STRIP_NAME_ENCODING mmix_strip_name_encoding | |
7811991d | 164 | |
68cbb7e3 | 165 | struct gcc_target targetm = TARGET_INITIALIZER; |
166 | ||
167 | /* Functions that are expansions for target macros. | |
168 | See Target Macros in `Using and Porting GCC'. */ | |
169 | ||
170 | /* OVERRIDE_OPTIONS. */ | |
171 | ||
172 | void | |
173 | mmix_override_options () | |
174 | { | |
175 | /* Should we err or should we warn? Hmm. At least we must neutralize | |
176 | it. For example the wrong kind of case-tables will be generated with | |
177 | PIC; we use absolute address items for mmixal compatibility. FIXME: | |
178 | They could be relative if we just elide them to after all pertinent | |
179 | labels. */ | |
180 | if (flag_pic) | |
181 | { | |
182 | warning ("-f%s not supported: ignored", (flag_pic > 1) ? "PIC" : "pic"); | |
183 | flag_pic = 0; | |
184 | } | |
68cbb7e3 | 185 | } |
186 | ||
187 | /* INIT_EXPANDERS. */ | |
188 | ||
189 | void | |
190 | mmix_init_expanders () | |
191 | { | |
192 | init_machine_status = mmix_init_machine_status; | |
193 | } | |
194 | ||
195 | /* Set the per-function data. */ | |
196 | ||
1f3233d1 | 197 | static struct machine_function * |
198 | mmix_init_machine_status () | |
68cbb7e3 | 199 | { |
1f3233d1 | 200 | return ggc_alloc_cleared (sizeof (struct machine_function)); |
68cbb7e3 | 201 | } |
202 | ||
203 | /* DATA_ALIGNMENT. | |
204 | We have trouble getting the address of stuff that is located at other | |
205 | than 32-bit alignments (GETA requirements), so try to give everything | |
206 | at least 32-bit alignment. */ | |
207 | ||
208 | int | |
209 | mmix_data_alignment (type, basic_align) | |
210 | tree type ATTRIBUTE_UNUSED; | |
211 | int basic_align; | |
212 | { | |
213 | if (basic_align < 32) | |
214 | return 32; | |
215 | ||
216 | return basic_align; | |
217 | } | |
218 | ||
219 | /* CONSTANT_ALIGNMENT. */ | |
220 | ||
221 | int | |
222 | mmix_constant_alignment (constant, basic_align) | |
223 | tree constant ATTRIBUTE_UNUSED; | |
224 | int basic_align; | |
225 | { | |
226 | if (basic_align < 32) | |
227 | return 32; | |
228 | ||
229 | return basic_align; | |
230 | } | |
231 | ||
232 | /* LOCAL_ALIGNMENT. */ | |
233 | ||
234 | int | |
235 | mmix_local_alignment (type, basic_align) | |
236 | tree type ATTRIBUTE_UNUSED; | |
237 | int basic_align; | |
238 | { | |
239 | if (basic_align < 32) | |
240 | return 32; | |
241 | ||
242 | return basic_align; | |
243 | } | |
244 | ||
245 | /* CONDITIONAL_REGISTER_USAGE. */ | |
246 | ||
247 | void | |
248 | mmix_conditional_register_usage () | |
249 | { | |
250 | int i; | |
251 | ||
252 | if (TARGET_ABI_GNU) | |
253 | { | |
254 | static const int gnu_abi_reg_alloc_order[] | |
255 | = MMIX_GNU_ABI_REG_ALLOC_ORDER; | |
256 | ||
257 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
258 | reg_alloc_order[i] = gnu_abi_reg_alloc_order[i]; | |
259 | ||
260 | /* Change the default from the mmixware ABI. For the GNU ABI, | |
261 | $15..$30 are call-saved just as $0..$14. There must be one | |
d3310704 | 262 | call-clobbered local register for the "hole" that holds the |
263 | number of saved local registers saved by PUSHJ/PUSHGO during the | |
264 | function call, receiving the return value at return. So best is | |
265 | to use the highest, $31. It's already marked call-clobbered for | |
266 | the mmixware ABI. */ | |
68cbb7e3 | 267 | for (i = 15; i <= 30; i++) |
268 | call_used_regs[i] = 0; | |
f0b228a5 | 269 | |
270 | /* "Unfix" the parameter registers. */ | |
271 | for (i = MMIX_RESERVED_GNU_ARG_0_REGNUM; | |
272 | i < MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS; | |
273 | i++) | |
274 | fixed_regs[i] = 0; | |
68cbb7e3 | 275 | } |
276 | ||
277 | /* Step over the ":" in special register names. */ | |
278 | if (! TARGET_TOPLEVEL_SYMBOLS) | |
279 | for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
280 | if (reg_names[i][0] == ':') | |
281 | reg_names[i]++; | |
282 | } | |
283 | ||
d3310704 | 284 | /* LOCAL_REGNO. |
285 | All registers that are part of the register stack and that will be | |
286 | saved are local. */ | |
287 | ||
288 | int | |
289 | mmix_local_regno (regno) | |
290 | int regno; | |
291 | { | |
292 | return regno <= MMIX_LAST_STACK_REGISTER_REGNUM && !call_used_regs[regno]; | |
293 | } | |
294 | ||
68cbb7e3 | 295 | /* PREFERRED_RELOAD_CLASS. |
296 | We need to extend the reload class of REMAINDER_REG and HIMULT_REG. */ | |
297 | ||
298 | enum reg_class | |
299 | mmix_preferred_reload_class (x, class) | |
300 | rtx x ATTRIBUTE_UNUSED; | |
301 | enum reg_class class; | |
302 | { | |
303 | /* FIXME: Revisit. */ | |
304 | return GET_CODE (x) == MOD && GET_MODE (x) == DImode | |
305 | ? REMAINDER_REG : class; | |
306 | } | |
307 | ||
308 | /* PREFERRED_OUTPUT_RELOAD_CLASS. | |
309 | We need to extend the reload class of REMAINDER_REG and HIMULT_REG. */ | |
310 | ||
311 | enum reg_class | |
312 | mmix_preferred_output_reload_class (x, class) | |
313 | rtx x ATTRIBUTE_UNUSED; | |
314 | enum reg_class class; | |
315 | { | |
316 | /* FIXME: Revisit. */ | |
317 | return GET_CODE (x) == MOD && GET_MODE (x) == DImode | |
318 | ? REMAINDER_REG : class; | |
319 | } | |
320 | ||
321 | /* SECONDARY_RELOAD_CLASS. | |
322 | We need to reload regs of REMAINDER_REG and HIMULT_REG elsewhere. */ | |
323 | ||
324 | enum reg_class | |
325 | mmix_secondary_reload_class (class, mode, x, in_p) | |
326 | enum reg_class class; | |
0103ffd2 | 327 | enum machine_mode mode ATTRIBUTE_UNUSED; |
328 | rtx x ATTRIBUTE_UNUSED; | |
329 | int in_p ATTRIBUTE_UNUSED; | |
68cbb7e3 | 330 | { |
331 | if (class == REMAINDER_REG | |
332 | || class == HIMULT_REG | |
333 | || class == SYSTEM_REGS) | |
334 | return GENERAL_REGS; | |
335 | ||
68cbb7e3 | 336 | return NO_REGS; |
337 | } | |
338 | ||
339 | /* CONST_OK_FOR_LETTER_P. */ | |
340 | ||
341 | int | |
342 | mmix_const_ok_for_letter_p (value, c) | |
343 | HOST_WIDE_INT value; | |
344 | int c; | |
345 | { | |
346 | return | |
347 | (c == 'I' ? value >= 0 && value <= 255 | |
348 | : c == 'J' ? value >= 0 && value <= 65535 | |
349 | : c == 'K' ? value <= 0 && value >= -255 | |
350 | : c == 'L' ? mmix_shiftable_wyde_value (value) | |
351 | : c == 'M' ? value == 0 | |
352 | : c == 'N' ? mmix_shiftable_wyde_value (~value) | |
353 | : c == 'O' ? (value == 3 || value == 5 || value == 9 | |
354 | || value == 17) | |
355 | : 0); | |
356 | } | |
357 | ||
358 | /* CONST_DOUBLE_OK_FOR_LETTER_P. */ | |
359 | ||
360 | int | |
361 | mmix_const_double_ok_for_letter_p (value, c) | |
362 | rtx value; | |
363 | int c; | |
364 | { | |
365 | return | |
366 | (c == 'G' ? value == CONST0_RTX (GET_MODE (value)) | |
367 | : 0); | |
368 | } | |
369 | ||
370 | /* EXTRA_CONSTRAINT. | |
371 | We need this since our constants are not always expressible as | |
372 | CONST_INT:s, but rather often as CONST_DOUBLE:s. */ | |
373 | ||
374 | int | |
0103ffd2 | 375 | mmix_extra_constraint (x, c, strict) |
68cbb7e3 | 376 | rtx x; |
377 | int c; | |
0103ffd2 | 378 | int strict; |
68cbb7e3 | 379 | { |
380 | HOST_WIDEST_INT value; | |
381 | ||
0103ffd2 | 382 | /* When checking for an address, we need to handle strict vs. non-strict |
383 | register checks. Don't use address_operand, but instead its | |
384 | equivalent (its callee, which it is just a wrapper for), | |
385 | memory_operand_p and the strict-equivalent strict_memory_address_p. */ | |
68cbb7e3 | 386 | if (c == 'U') |
0103ffd2 | 387 | return |
388 | strict | |
389 | ? strict_memory_address_p (Pmode, x) | |
390 | : memory_address_p (Pmode, x); | |
68cbb7e3 | 391 | |
f0b228a5 | 392 | /* R asks whether x is to be loaded with GETA or something else. Right |
393 | now, only a SYMBOL_REF and LABEL_REF can fit for | |
394 | TARGET_BASE_ADDRESSES. | |
395 | ||
396 | Only constant symbolic addresses apply. With TARGET_BASE_ADDRESSES, | |
397 | we just allow straight LABEL_REF or SYMBOL_REFs with SYMBOL_REF_FLAG | |
398 | set right now; only function addresses and code labels. If we change | |
399 | to let SYMBOL_REF_FLAG be set on other symbols, we have to check | |
400 | inside CONST expressions. When TARGET_BASE_ADDRESSES is not in | |
401 | effect, a "raw" constant check together with mmix_constant_address_p | |
402 | is all that's needed; we want all constant addresses to be loaded | |
403 | with GETA then. */ | |
404 | if (c == 'R') | |
405 | return | |
406 | GET_CODE (x) != CONST_INT && GET_CODE (x) != CONST_DOUBLE | |
407 | && mmix_constant_address_p (x) | |
408 | && (! TARGET_BASE_ADDRESSES | |
409 | || (GET_CODE (x) == LABEL_REF | |
410 | || (GET_CODE (x) == SYMBOL_REF && SYMBOL_REF_FLAG (x)))); | |
411 | ||
68cbb7e3 | 412 | if (GET_CODE (x) != CONST_DOUBLE || GET_MODE (x) != VOIDmode) |
413 | return 0; | |
414 | ||
415 | value = mmix_intval (x); | |
416 | ||
417 | /* We used to map Q->J, R->K, S->L, T->N, U->O, but we don't have to any | |
f0b228a5 | 418 | more ('U' taken for address_operand, 'R' similarly). Some letters map |
419 | outside of CONST_INT, though; we still use 'S' and 'T'. */ | |
68cbb7e3 | 420 | if (c == 'S') |
421 | return mmix_shiftable_wyde_value (value); | |
422 | else if (c == 'T') | |
423 | return mmix_shiftable_wyde_value (~value); | |
424 | return 0; | |
425 | } | |
426 | ||
427 | /* DYNAMIC_CHAIN_ADDRESS. */ | |
428 | ||
429 | rtx | |
430 | mmix_dynamic_chain_address (frame) | |
431 | rtx frame; | |
432 | { | |
433 | /* FIXME: the frame-pointer is stored at offset -8 from the current | |
434 | frame-pointer. Unfortunately, the caller assumes that a | |
435 | frame-pointer is present for *all* previous frames. There should be | |
436 | a way to say that that cannot be done, like for RETURN_ADDR_RTX. */ | |
437 | return plus_constant (frame, -8); | |
438 | } | |
439 | ||
440 | /* STARTING_FRAME_OFFSET. */ | |
441 | ||
442 | int | |
443 | mmix_starting_frame_offset () | |
444 | { | |
445 | /* The old frame pointer is in the slot below the new one, so | |
446 | FIRST_PARM_OFFSET does not need to depend on whether the | |
447 | frame-pointer is needed or not. We have to adjust for the register | |
448 | stack pointer being located below the saved frame pointer. | |
449 | Similarly, we store the return address on the stack too, for | |
450 | exception handling, and always if we save the register stack pointer. */ | |
451 | return | |
452 | (-8 | |
453 | + (MMIX_CFUN_HAS_LANDING_PAD | |
454 | ? -16 : (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS ? -8 : 0))); | |
455 | } | |
456 | ||
457 | /* RETURN_ADDR_RTX. */ | |
458 | ||
459 | rtx | |
460 | mmix_return_addr_rtx (count, frame) | |
461 | int count; | |
462 | rtx frame ATTRIBUTE_UNUSED; | |
463 | { | |
464 | return count == 0 | |
465 | ? (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS | |
af08e904 | 466 | /* FIXME: Set frame_alias_set on the following. (Why?) |
467 | See mmix_initial_elimination_offset for the reason we can't use | |
468 | get_hard_reg_initial_val for both. Always using a stack slot | |
469 | and not a register would be suboptimal. */ | |
68cbb7e3 | 470 | ? validize_mem (gen_rtx_MEM (Pmode, plus_constant (frame_pointer_rtx, -16))) |
471 | : get_hard_reg_initial_val (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)) | |
472 | : NULL_RTX; | |
473 | } | |
474 | ||
475 | /* SETUP_FRAME_ADDRESSES. */ | |
476 | ||
477 | void | |
478 | mmix_setup_frame_addresses () | |
479 | { | |
480 | /* Nothing needed at the moment. */ | |
481 | } | |
482 | ||
483 | /* The difference between the (imaginary) frame pointer and the stack | |
484 | pointer. Used to eliminate the frame pointer. */ | |
485 | ||
486 | int | |
487 | mmix_initial_elimination_offset (fromreg, toreg) | |
488 | int fromreg; | |
489 | int toreg; | |
490 | { | |
491 | int regno; | |
492 | int fp_sp_offset | |
493 | = (get_frame_size () + current_function_outgoing_args_size + 7) & ~7; | |
494 | ||
af08e904 | 495 | /* There is no actual offset between these two virtual values, but for |
496 | the frame-pointer, we have the old one in the stack position below | |
497 | it, so the offset for the frame-pointer to the stack-pointer is one | |
498 | octabyte larger. */ | |
68cbb7e3 | 499 | if (fromreg == MMIX_ARG_POINTER_REGNUM |
500 | && toreg == MMIX_FRAME_POINTER_REGNUM) | |
501 | return 0; | |
502 | ||
503 | /* The difference is the size of local variables plus the size of | |
504 | outgoing function arguments that would normally be passed as | |
505 | registers but must be passed on stack because we're out of | |
506 | function-argument registers. Only global saved registers are | |
507 | counted; the others go on the register stack. | |
508 | ||
509 | The frame-pointer is counted too if it is what is eliminated, as we | |
510 | need to balance the offset for it from STARTING_FRAME_OFFSET. | |
511 | ||
512 | Also add in the slot for the register stack pointer we save if we | |
513 | have a landing pad. | |
514 | ||
515 | Unfortunately, we can't access $0..$14, from unwinder code easily, so | |
516 | store the return address in a frame slot too. FIXME: Only for | |
517 | non-leaf functions. FIXME: Always with a landing pad, because it's | |
518 | hard to know whether we need the other at the time we know we need | |
519 | the offset for one (and have to state it). It's a kludge until we | |
520 | can express the register stack in the EH frame info. | |
521 | ||
522 | We have to do alignment here; get_frame_size will not return a | |
523 | multiple of STACK_BOUNDARY. FIXME: Add note in manual. */ | |
524 | ||
525 | for (regno = MMIX_FIRST_GLOBAL_REGNUM; | |
526 | regno <= 255; | |
527 | regno++) | |
528 | if ((regs_ever_live[regno] && ! call_used_regs[regno]) | |
529 | || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
530 | fp_sp_offset += 8; | |
531 | ||
532 | return fp_sp_offset | |
533 | + (MMIX_CFUN_HAS_LANDING_PAD | |
534 | ? 16 : (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS ? 8 : 0)) | |
535 | + (fromreg == MMIX_ARG_POINTER_REGNUM ? 0 : 8); | |
536 | } | |
537 | ||
538 | /* Return an rtx for a function argument to go in a register, and 0 for | |
539 | one that must go on stack. */ | |
540 | ||
541 | rtx | |
542 | mmix_function_arg (argsp, mode, type, named, incoming) | |
543 | const CUMULATIVE_ARGS * argsp; | |
544 | enum machine_mode mode; | |
545 | tree type; | |
546 | int named ATTRIBUTE_UNUSED; | |
547 | int incoming; | |
548 | { | |
68cbb7e3 | 549 | /* Last-argument marker. */ |
550 | if (type == void_type_node) | |
551 | return (argsp->regs < MMIX_MAX_ARGS_IN_REGS) | |
552 | ? gen_rtx_REG (mode, | |
553 | (incoming | |
554 | ? MMIX_FIRST_INCOMING_ARG_REGNUM | |
555 | : MMIX_FIRST_ARG_REGNUM) + argsp->regs) | |
556 | : NULL_RTX; | |
557 | ||
558 | return (argsp->regs < MMIX_MAX_ARGS_IN_REGS | |
559 | && !MUST_PASS_IN_STACK (mode, type) | |
560 | && (GET_MODE_BITSIZE (mode) <= 64 | |
561 | || argsp->lib | |
562 | || TARGET_LIBFUNC)) | |
563 | ? gen_rtx_REG (mode, | |
564 | (incoming | |
565 | ? MMIX_FIRST_INCOMING_ARG_REGNUM | |
566 | : MMIX_FIRST_ARG_REGNUM) | |
567 | + argsp->regs) | |
568 | : NULL_RTX; | |
569 | } | |
570 | ||
571 | /* Returns nonzero for everything that goes by reference, 0 for | |
572 | everything that goes by value. */ | |
573 | ||
574 | int | |
575 | mmix_function_arg_pass_by_reference (argsp, mode, type, named) | |
576 | const CUMULATIVE_ARGS * argsp; | |
577 | enum machine_mode mode; | |
578 | tree type; | |
579 | int named ATTRIBUTE_UNUSED; | |
580 | { | |
581 | /* FIXME: Check: I'm not sure the MUST_PASS_IN_STACK check is | |
582 | necessary. */ | |
583 | return | |
584 | MUST_PASS_IN_STACK (mode, type) | |
585 | || (MMIX_FUNCTION_ARG_SIZE (mode, type) > 8 | |
586 | && !TARGET_LIBFUNC | |
587 | && !argsp->lib); | |
588 | } | |
589 | ||
590 | /* Return nonzero if regno is a register number where a parameter is | |
591 | passed, and 0 otherwise. */ | |
592 | ||
593 | int | |
594 | mmix_function_arg_regno_p (regno, incoming) | |
595 | int regno; | |
596 | int incoming; | |
597 | { | |
598 | int first_arg_regnum | |
599 | = incoming ? MMIX_FIRST_INCOMING_ARG_REGNUM : MMIX_FIRST_ARG_REGNUM; | |
600 | ||
601 | return regno >= first_arg_regnum | |
602 | && regno < first_arg_regnum + MMIX_MAX_ARGS_IN_REGS; | |
603 | } | |
604 | ||
605 | /* FUNCTION_OUTGOING_VALUE. */ | |
606 | ||
607 | rtx | |
608 | mmix_function_outgoing_value (valtype, func) | |
609 | tree valtype; | |
610 | tree func ATTRIBUTE_UNUSED; | |
611 | { | |
612 | enum machine_mode mode = TYPE_MODE (valtype); | |
68cbb7e3 | 613 | enum machine_mode cmode; |
614 | int first_val_regnum = MMIX_OUTGOING_RETURN_VALUE_REGNUM; | |
615 | rtx vec[MMIX_MAX_REGS_FOR_VALUE]; | |
616 | int i; | |
617 | int nregs; | |
618 | ||
619 | /* Return values that fit in a register need no special handling. | |
620 | There's no register hole when parameters are passed in global | |
621 | registers. */ | |
622 | if (TARGET_ABI_GNU | |
623 | || GET_MODE_BITSIZE (mode) <= BITS_PER_WORD) | |
624 | return | |
625 | gen_rtx_REG (mode, MMIX_OUTGOING_RETURN_VALUE_REGNUM); | |
626 | ||
627 | /* A complex type, made up of components. */ | |
628 | cmode = TYPE_MODE (TREE_TYPE (valtype)); | |
629 | nregs = ((GET_MODE_BITSIZE (mode) + BITS_PER_WORD - 1) / BITS_PER_WORD); | |
630 | ||
631 | /* We need to take care of the effect of the register hole on return | |
632 | values of large sizes; the last register will appear as the first | |
633 | register, with the rest shifted. (For complex modes, this is just | |
634 | swapped registers.) */ | |
635 | ||
636 | if (nregs > MMIX_MAX_REGS_FOR_VALUE) | |
68435912 | 637 | internal_error ("too large function value type, needs %d registers,\ |
68cbb7e3 | 638 | have only %d registers for this", nregs, MMIX_MAX_REGS_FOR_VALUE); |
639 | ||
640 | /* FIXME: Maybe we should handle structure values like this too | |
641 | (adjusted for BLKmode), perhaps for both ABI:s. */ | |
642 | for (i = 0; i < nregs - 1; i++) | |
643 | vec[i] | |
644 | = gen_rtx_EXPR_LIST (VOIDmode, | |
645 | gen_rtx_REG (cmode, first_val_regnum + i), | |
646 | GEN_INT ((i + 1) * BITS_PER_UNIT)); | |
647 | ||
648 | vec[nregs - 1] | |
649 | = gen_rtx_EXPR_LIST (VOIDmode, | |
650 | gen_rtx_REG (cmode, first_val_regnum + nregs - 1), | |
651 | GEN_INT (0)); | |
652 | ||
653 | return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nregs, vec)); | |
654 | } | |
655 | ||
656 | /* EH_RETURN_DATA_REGNO. */ | |
657 | ||
658 | int | |
659 | mmix_eh_return_data_regno (n) | |
660 | int n ATTRIBUTE_UNUSED; | |
661 | { | |
662 | if (n >= 0 && n < 4) | |
663 | return MMIX_EH_RETURN_DATA_REGNO_START + n; | |
664 | ||
665 | return INVALID_REGNUM; | |
666 | } | |
667 | ||
668 | /* EH_RETURN_STACKADJ_RTX. */ | |
669 | ||
670 | rtx | |
671 | mmix_eh_return_stackadj_rtx () | |
672 | { | |
673 | return gen_rtx_REG (Pmode, MMIX_EH_RETURN_STACKADJ_REGNUM); | |
674 | } | |
675 | ||
676 | /* EH_RETURN_HANDLER_RTX. */ | |
677 | ||
678 | rtx | |
679 | mmix_eh_return_handler_rtx () | |
680 | { | |
681 | return | |
682 | gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM); | |
683 | } | |
684 | ||
685 | /* ASM_PREFERRED_EH_DATA_FORMAT. */ | |
686 | ||
687 | int | |
688 | mmix_asm_preferred_eh_data_format (code, global) | |
689 | int code ATTRIBUTE_UNUSED; | |
690 | int global ATTRIBUTE_UNUSED; | |
691 | { | |
692 | /* This is the default (was at 2001-07-20). Revisit when needed. */ | |
693 | return DW_EH_PE_absptr; | |
694 | } | |
695 | ||
d3310704 | 696 | /* Make a note that we've seen the beginning of of the prologue. This |
697 | matters to whether we'll translate register numbers as calculated by | |
698 | mmix_machine_dependent_reorg. */ | |
68cbb7e3 | 699 | |
d3310704 | 700 | static void |
701 | mmix_target_asm_function_prologue (stream, framesize) | |
702 | FILE *stream ATTRIBUTE_UNUSED; | |
703 | HOST_WIDE_INT framesize ATTRIBUTE_UNUSED; | |
68cbb7e3 | 704 | { |
d3310704 | 705 | cfun->machine->in_prologue = 1; |
706 | } | |
68cbb7e3 | 707 | |
d3310704 | 708 | /* Make a note that we've seen the end of the prologue. */ |
68cbb7e3 | 709 | |
d3310704 | 710 | static void |
711 | mmix_target_asm_function_end_prologue (stream) | |
712 | FILE *stream ATTRIBUTE_UNUSED; | |
713 | { | |
714 | cfun->machine->in_prologue = 0; | |
d68ffc6f | 715 | } |
716 | ||
717 | /* MACHINE_DEPENDENT_REORG. | |
718 | No actual rearrangements done here; just virtually by calculating the | |
719 | highest saved stack register number used to modify the register numbers | |
720 | at output time. */ | |
721 | ||
722 | void | |
723 | mmix_machine_dependent_reorg (first) | |
724 | rtx first ATTRIBUTE_UNUSED; | |
725 | { | |
726 | int regno; | |
68cbb7e3 | 727 | |
728 | /* We put the number of the highest saved register-file register in a | |
729 | location convenient for the call-patterns to output. Note that we | |
730 | don't tell dwarf2 about these registers, since it can't restore them | |
731 | anyway. */ | |
d68ffc6f | 732 | for (regno = MMIX_LAST_STACK_REGISTER_REGNUM; |
68cbb7e3 | 733 | regno >= 0; |
734 | regno--) | |
735 | if ((regs_ever_live[regno] && !call_used_regs[regno]) | |
736 | || (regno == MMIX_FRAME_POINTER_REGNUM && frame_pointer_needed)) | |
737 | break; | |
738 | ||
d68ffc6f | 739 | /* Regardless of whether they're saved (they might be just read), we |
740 | mustn't include registers that carry parameters. We could scan the | |
741 | insns to see whether they're actually used (and indeed do other less | |
742 | trivial register usage analysis and transformations), but it seems | |
743 | wasteful to optimize for unused parameter registers. As of | |
744 | 2002-04-30, regs_ever_live[n] seems to be set for only-reads too, but | |
745 | that might change. */ | |
746 | if (!TARGET_ABI_GNU && regno < current_function_args_info.regs - 1) | |
747 | { | |
748 | regno = current_function_args_info.regs - 1; | |
749 | ||
750 | /* We don't want to let this cause us to go over the limit and make | |
751 | incoming parameter registers be misnumbered and treating the last | |
752 | parameter register and incoming return value register call-saved. | |
753 | Stop things at the unmodified scheme. */ | |
754 | if (regno > MMIX_RETURN_VALUE_REGNUM - 1) | |
755 | regno = MMIX_RETURN_VALUE_REGNUM - 1; | |
756 | } | |
757 | ||
758 | cfun->machine->highest_saved_stack_register = regno; | |
68cbb7e3 | 759 | } |
760 | ||
761 | /* TARGET_ASM_FUNCTION_EPILOGUE. */ | |
762 | ||
763 | void | |
764 | mmix_target_asm_function_epilogue (stream, locals_size) | |
765 | FILE *stream; | |
766 | HOST_WIDE_INT locals_size; | |
767 | ||
768 | { | |
d3310704 | 769 | /* Emit an \n for readability of the generated assembly. */ |
770 | fputc ('\n', stream); | |
771 | } | |
68cbb7e3 | 772 | |
d3310704 | 773 | /* ASM_OUTPUT_MI_THUNK. */ |
68cbb7e3 | 774 | |
d3310704 | 775 | void |
776 | mmix_asm_output_mi_thunk (stream, fndecl, delta, func) | |
777 | FILE * stream; | |
778 | tree fndecl ATTRIBUTE_UNUSED; | |
779 | int delta; | |
780 | tree func; | |
781 | { | |
782 | /* If you define STRUCT_VALUE to 0, rather than use STRUCT_VALUE_REGNUM, | |
783 | (i.e. pass location of structure to return as invisible first | |
784 | argument) you need to tweak this code too. */ | |
785 | const char *regname = reg_names[MMIX_FIRST_INCOMING_ARG_REGNUM]; | |
68cbb7e3 | 786 | |
d3310704 | 787 | if (delta >= 0 && delta < 65536) |
788 | asm_fprintf (stream, "\tINCL %s,%d\n", delta, regname); | |
789 | else if (delta < 0 && delta >= -255) | |
790 | asm_fprintf (stream, "\tSUBU %s,%s,%d\n", regname, regname, -delta); | |
791 | else | |
0b123c47 | 792 | { |
d3310704 | 793 | mmix_output_register_setting (stream, 255, delta, 1); |
794 | asm_fprintf (stream, "\tADDU %s,%s,$255\n", regname, regname); | |
0b123c47 | 795 | } |
796 | ||
d3310704 | 797 | fprintf (stream, "\tJMP "); |
798 | assemble_name (stream, XSTR (XEXP (DECL_RTL (func), 0), 0)); | |
799 | fprintf (stream, "\n"); | |
800 | } | |
68cbb7e3 | 801 | |
d3310704 | 802 | /* FUNCTION_PROFILER. */ |
68cbb7e3 | 803 | |
d3310704 | 804 | void |
805 | mmix_function_profiler (stream, labelno) | |
806 | FILE *stream ATTRIBUTE_UNUSED; | |
807 | int labelno ATTRIBUTE_UNUSED; | |
808 | { | |
809 | sorry ("function_profiler support for MMIX"); | |
810 | } | |
68cbb7e3 | 811 | |
68cbb7e3 | 812 | /* SETUP_INCOMING_VARARGS. */ |
813 | ||
814 | void | |
815 | mmix_setup_incoming_varargs (args_so_farp, mode, vartype, pretend_sizep, | |
816 | second_time) | |
817 | CUMULATIVE_ARGS * args_so_farp; | |
818 | enum machine_mode mode; | |
819 | tree vartype; | |
820 | int * pretend_sizep; | |
821 | int second_time ATTRIBUTE_UNUSED; | |
822 | { | |
7ccc713a | 823 | /* The last named variable has been handled, but |
824 | args_so_farp has not been advanced for it. */ | |
825 | if (args_so_farp->regs + 1 < MMIX_MAX_ARGS_IN_REGS) | |
826 | *pretend_sizep = (MMIX_MAX_ARGS_IN_REGS - (args_so_farp->regs + 1)) * 8; | |
68cbb7e3 | 827 | |
828 | /* We assume that one argument takes up one register here. That should | |
829 | be true until we start messing with multi-reg parameters. */ | |
830 | if ((7 + (MMIX_FUNCTION_ARG_SIZE (mode, vartype))) / 8 != 1) | |
831 | internal_error ("MMIX Internal: Last named vararg would not fit in a register"); | |
832 | } | |
833 | ||
834 | /* EXPAND_BUILTIN_VA_ARG. */ | |
835 | ||
836 | /* This is modified from the "standard" implementation of va_arg: read the | |
837 | value from the current (padded) address and increment by the (padded) | |
838 | size. The difference for MMIX is that if the type is | |
839 | pass-by-reference, then perform an indirection. */ | |
840 | ||
841 | rtx | |
842 | mmix_expand_builtin_va_arg (valist, type) | |
843 | tree valist; | |
844 | tree type; | |
845 | { | |
39e4b33f | 846 | tree ptr_size = size_int (BITS_PER_WORD / BITS_PER_UNIT); |
847 | tree addr_tree, type_size = NULL; | |
848 | tree align, alignm1; | |
849 | tree rounded_size; | |
68cbb7e3 | 850 | rtx addr; |
851 | ||
852 | /* Compute the rounded size of the type. */ | |
68cbb7e3 | 853 | |
854 | /* Get AP. */ | |
855 | addr_tree = valist; | |
39e4b33f | 856 | align = size_int (PARM_BOUNDARY / BITS_PER_UNIT); |
857 | alignm1 = size_int (PARM_BOUNDARY / BITS_PER_UNIT - 1); | |
858 | if (type == error_mark_node | |
859 | || (type_size = TYPE_SIZE_UNIT (TYPE_MAIN_VARIANT (type))) == NULL | |
860 | || TREE_OVERFLOW (type_size)) | |
adcdc3d7 | 861 | /* Presumably an error; the size isn't computable. A message has |
39e4b33f | 862 | supposedly been emitted elsewhere. */ |
863 | rounded_size = size_zero_node; | |
864 | else | |
865 | rounded_size = fold (build (MULT_EXPR, sizetype, | |
866 | fold (build (TRUNC_DIV_EXPR, sizetype, | |
867 | fold (build (PLUS_EXPR, sizetype, | |
868 | type_size, alignm1)), | |
869 | align)), | |
870 | align)); | |
68cbb7e3 | 871 | |
872 | if (AGGREGATE_TYPE_P (type) | |
873 | && GET_MODE_UNIT_SIZE (TYPE_MODE (type)) < 8 | |
874 | && GET_MODE_UNIT_SIZE (TYPE_MODE (type)) != 0) | |
875 | { | |
876 | /* Adjust for big-endian the location of aggregates passed in a | |
877 | register, but where the aggregate is accessed in a shorter mode | |
878 | than the natural register mode (i.e. it is accessed as SFmode(?), | |
879 | SImode, HImode or QImode rather than DImode or DFmode(?)). FIXME: | |
880 | Or should we adjust the mode in which the aggregate is read, to be | |
881 | a register size mode? (Hum, nah, a small offset is generally | |
882 | cheaper than a wider memory access on MMIX.) */ | |
883 | addr_tree | |
884 | = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree, | |
39e4b33f | 885 | size_int ((BITS_PER_WORD / BITS_PER_UNIT) |
886 | - GET_MODE_UNIT_SIZE (TYPE_MODE (type)))); | |
68cbb7e3 | 887 | } |
39e4b33f | 888 | else if (!integer_zerop (rounded_size)) |
68cbb7e3 | 889 | { |
adcdc3d7 | 890 | if (!really_constant_p (type_size)) |
891 | /* Varying-size types come in by reference. */ | |
892 | addr_tree | |
893 | = build1 (INDIRECT_REF, build_pointer_type (type), addr_tree); | |
894 | else | |
895 | { | |
896 | /* If the size is less than a register, then we need to pad the | |
897 | address by adding the difference. */ | |
898 | tree addend | |
899 | = fold (build (COND_EXPR, sizetype, | |
900 | fold (build (GT_EXPR, sizetype, | |
901 | rounded_size, | |
902 | align)), | |
903 | size_zero_node, | |
904 | fold (build (MINUS_EXPR, sizetype, | |
905 | rounded_size, | |
906 | type_size)))); | |
907 | tree addr_tree1 | |
908 | = fold (build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree, | |
909 | addend)); | |
910 | ||
911 | /* If this type is larger than what fits in a register, then it | |
912 | is passed by reference. */ | |
913 | addr_tree | |
914 | = fold (build (COND_EXPR, TREE_TYPE (addr_tree1), | |
915 | fold (build (GT_EXPR, sizetype, | |
916 | rounded_size, | |
917 | ptr_size)), | |
918 | build1 (INDIRECT_REF, build_pointer_type (type), | |
919 | addr_tree1), | |
920 | addr_tree1)); | |
921 | } | |
39e4b33f | 922 | } |
68cbb7e3 | 923 | |
924 | addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL); | |
925 | addr = copy_to_reg (addr); | |
926 | ||
39e4b33f | 927 | if (!integer_zerop (rounded_size)) |
928 | { | |
929 | /* Compute new value for AP. For MMIX, it is always advanced by the | |
930 | size of a register. */ | |
931 | tree t = build (MODIFY_EXPR, TREE_TYPE (valist), valist, | |
932 | build (PLUS_EXPR, TREE_TYPE (valist), valist, | |
933 | ptr_size)); | |
934 | TREE_SIDE_EFFECTS (t) = 1; | |
935 | expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
936 | } | |
68cbb7e3 | 937 | |
938 | return addr; | |
939 | } | |
940 | ||
941 | /* TRAMPOLINE_SIZE. */ | |
942 | /* Four 4-byte insns plus two 8-byte values. */ | |
943 | int mmix_trampoline_size = 32; | |
944 | ||
945 | ||
946 | /* TRAMPOLINE_TEMPLATE. */ | |
947 | ||
948 | void | |
949 | mmix_trampoline_template (stream) | |
950 | FILE * stream; | |
951 | { | |
af08e904 | 952 | /* Read a value into the static-chain register and jump somewhere. The |
953 | static chain is stored at offset 16, and the function address is | |
954 | stored at offset 24. */ | |
68cbb7e3 | 955 | /* FIXME: GCC copies this using *intsize* (tetra), when it should use |
956 | register size (octa). */ | |
957 | fprintf (stream, "\tGETA $255,1F\n\t"); | |
958 | fprintf (stream, "LDOU %s,$255,0\n\t", | |
959 | reg_names[MMIX_STATIC_CHAIN_REGNUM]); | |
960 | fprintf (stream, "LDOU $255,$255,8\n\t"); | |
961 | fprintf (stream, "GO $255,$255,0\n"); | |
962 | fprintf (stream, "1H\tOCTA 0\n\t"); | |
963 | fprintf (stream, "OCTA 0\n"); | |
964 | } | |
965 | ||
966 | /* INITIALIZE_TRAMPOLINE. */ | |
967 | /* Set the static chain and function pointer field in the trampoline. | |
968 | We also SYNCID here to be sure (doesn't matter in the simulator, but | |
969 | some day it will). */ | |
970 | ||
971 | void | |
972 | mmix_initialize_trampoline (trampaddr, fnaddr, static_chain) | |
973 | rtx trampaddr; | |
974 | rtx fnaddr; | |
975 | rtx static_chain; | |
976 | { | |
977 | emit_move_insn (gen_rtx_MEM (DImode, plus_constant (trampaddr, 16)), | |
978 | static_chain); | |
979 | emit_move_insn (gen_rtx_MEM (DImode, | |
980 | plus_constant (trampaddr, 24)), | |
981 | fnaddr); | |
982 | emit_insn (gen_sync_icache (validize_mem (gen_rtx_MEM (DImode, | |
983 | trampaddr)), | |
984 | GEN_INT (mmix_trampoline_size - 1))); | |
985 | } | |
986 | ||
987 | /* We must exclude constant addresses that have an increment that is not a | |
988 | multiple of four bytes because of restrictions of the GETA | |
f0b228a5 | 989 | instruction, unless TARGET_BASE_ADDRESSES. */ |
68cbb7e3 | 990 | |
991 | int | |
992 | mmix_constant_address_p (x) | |
993 | rtx x; | |
994 | { | |
995 | RTX_CODE code = GET_CODE (x); | |
996 | int addend = 0; | |
f0b228a5 | 997 | /* When using "base addresses", anything constant goes. */ |
998 | int constant_ok = TARGET_BASE_ADDRESSES != 0; | |
68cbb7e3 | 999 | |
68cbb7e3 | 1000 | switch (code) |
1001 | { | |
1002 | case LABEL_REF: | |
1003 | case SYMBOL_REF: | |
1004 | return 1; | |
1005 | ||
68cbb7e3 | 1006 | case CONSTANT_P_RTX: |
1007 | case HIGH: | |
f0b228a5 | 1008 | /* FIXME: Don't know how to dissect these. Avoid them for now, |
1009 | except we know they're constants. */ | |
1010 | return constant_ok; | |
68cbb7e3 | 1011 | |
1012 | case CONST_INT: | |
1013 | addend = INTVAL (x); | |
1014 | break; | |
1015 | ||
1016 | case CONST_DOUBLE: | |
1017 | if (GET_MODE (x) != VOIDmode) | |
1018 | /* Strange that we got here. FIXME: Check if we do. */ | |
f0b228a5 | 1019 | return constant_ok; |
68cbb7e3 | 1020 | addend = CONST_DOUBLE_LOW (x); |
1021 | break; | |
1022 | ||
1023 | case CONST: | |
1024 | /* Note that expressions with arithmetic on forward references don't | |
1025 | work in mmixal. People using gcc assembly code with mmixal might | |
1026 | need to move arrays and such to before the point of use. */ | |
1027 | if (GET_CODE (XEXP (x, 0)) == PLUS) | |
1028 | { | |
1029 | rtx x0 = XEXP (XEXP (x, 0), 0); | |
1030 | rtx x1 = XEXP (XEXP (x, 0), 1); | |
1031 | ||
1032 | if ((GET_CODE (x0) == SYMBOL_REF | |
1033 | || GET_CODE (x0) == LABEL_REF) | |
1034 | && (GET_CODE (x1) == CONST_INT | |
1035 | || (GET_CODE (x1) == CONST_DOUBLE | |
1036 | && GET_MODE (x1) == VOIDmode))) | |
1037 | addend = mmix_intval (x1); | |
1038 | else | |
f0b228a5 | 1039 | return constant_ok; |
68cbb7e3 | 1040 | } |
1041 | else | |
f0b228a5 | 1042 | return constant_ok; |
68cbb7e3 | 1043 | break; |
1044 | ||
1045 | default: | |
1046 | return 0; | |
1047 | } | |
1048 | ||
f0b228a5 | 1049 | return constant_ok || (addend & 3) == 0; |
68cbb7e3 | 1050 | } |
1051 | ||
1052 | /* Return 1 if the address is OK, otherwise 0. | |
1053 | Used by GO_IF_LEGITIMATE_ADDRESS. */ | |
1054 | ||
1055 | int | |
1056 | mmix_legitimate_address (mode, x, strict_checking) | |
1057 | enum machine_mode mode ATTRIBUTE_UNUSED; | |
1058 | rtx x; | |
1059 | int strict_checking; | |
1060 | { | |
1061 | #define MMIX_REG_OK(X) \ | |
1062 | ((strict_checking \ | |
1063 | && (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \ | |
1064 | || (reg_renumber[REGNO (X)] > 0 \ | |
1065 | && reg_renumber[REGNO (X)] <= MMIX_LAST_GENERAL_REGISTER))) \ | |
1066 | || (!strict_checking \ | |
1067 | && (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \ | |
1068 | || REGNO (X) >= FIRST_PSEUDO_REGISTER \ | |
1069 | || REGNO (X) == ARG_POINTER_REGNUM))) | |
1070 | ||
1071 | /* We only accept: | |
1072 | (mem reg) | |
1073 | (mem (plus reg reg)) | |
f0b228a5 | 1074 | (mem (plus reg 0..255)). |
1075 | unless TARGET_BASE_ADDRESSES, in which case we accept all | |
1076 | (mem constant_address) too. */ | |
68cbb7e3 | 1077 | |
1078 | ||
1079 | /* (mem reg) */ | |
1080 | if (REG_P (x) && MMIX_REG_OK (x)) | |
1081 | return 1; | |
1082 | ||
1083 | if (GET_CODE(x) == PLUS) | |
1084 | { | |
1085 | rtx x1 = XEXP (x, 0); | |
1086 | rtx x2 = XEXP (x, 1); | |
1087 | ||
1088 | /* Try swapping the order. FIXME: Do we need this? */ | |
1089 | if (! REG_P (x1)) | |
1090 | { | |
1091 | rtx tem = x1; | |
1092 | x1 = x2; | |
1093 | x2 = tem; | |
1094 | } | |
1095 | ||
f0b228a5 | 1096 | /* (mem (plus (reg?) (?))) */ |
68cbb7e3 | 1097 | if (!REG_P (x1) || !MMIX_REG_OK (x1)) |
f0b228a5 | 1098 | return TARGET_BASE_ADDRESSES && mmix_constant_address_p (x); |
68cbb7e3 | 1099 | |
f0b228a5 | 1100 | /* (mem (plus (reg) (reg?))) */ |
68cbb7e3 | 1101 | if (REG_P (x2) && MMIX_REG_OK (x2)) |
1102 | return 1; | |
1103 | ||
f0b228a5 | 1104 | /* (mem (plus (reg) (0..255?))) */ |
68cbb7e3 | 1105 | if (GET_CODE (x2) == CONST_INT |
1106 | && CONST_OK_FOR_LETTER_P (INTVAL (x2), 'I')) | |
1107 | return 1; | |
f0b228a5 | 1108 | |
1109 | return 0; | |
68cbb7e3 | 1110 | } |
1111 | ||
f0b228a5 | 1112 | return TARGET_BASE_ADDRESSES && mmix_constant_address_p (x); |
68cbb7e3 | 1113 | } |
1114 | ||
1115 | /* LEGITIMATE_CONSTANT_P. */ | |
1116 | ||
1117 | int | |
1118 | mmix_legitimate_constant_p (x) | |
1119 | rtx x; | |
1120 | { | |
1121 | RTX_CODE code = GET_CODE (x); | |
1122 | ||
1123 | /* We must allow any number due to the way the cse passes works; if we | |
1124 | do not allow any number here, general_operand will fail, and insns | |
1125 | will fatally fail recognition instead of "softly". */ | |
1126 | if (code == CONST_INT || code == CONST_DOUBLE) | |
1127 | return 1; | |
1128 | ||
1129 | return CONSTANT_ADDRESS_P (x); | |
1130 | } | |
1131 | ||
1132 | /* SELECT_CC_MODE. */ | |
1133 | ||
1134 | enum machine_mode | |
1135 | mmix_select_cc_mode (op, x, y) | |
1136 | RTX_CODE op; | |
1137 | rtx x; | |
1138 | rtx y ATTRIBUTE_UNUSED; | |
1139 | { | |
1140 | /* We use CCmode, CC_UNSmode, CC_FPmode, CC_FPEQmode and CC_FUNmode to | |
1141 | output different compare insns. Note that we do not check the | |
1142 | validity of the comparison here. */ | |
1143 | ||
1144 | if (GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT) | |
1145 | { | |
1146 | if (op == ORDERED || op == UNORDERED || op == UNGE | |
1147 | || op == UNGT || op == UNLE || op == UNLT) | |
1148 | return CC_FUNmode; | |
1149 | ||
1150 | if (op == EQ || op == NE) | |
1151 | return CC_FPEQmode; | |
1152 | ||
1153 | return CC_FPmode; | |
1154 | } | |
1155 | ||
1156 | if (op == GTU || op == LTU || op == GEU || op == LEU) | |
1157 | return CC_UNSmode; | |
1158 | ||
1159 | return CCmode; | |
1160 | } | |
1161 | ||
68cbb7e3 | 1162 | /* REVERSIBLE_CC_MODE. */ |
1163 | ||
1164 | int | |
1165 | mmix_reversible_cc_mode (mode) | |
1166 | enum machine_mode mode; | |
1167 | { | |
1168 | /* That is, all integer and the EQ, NE, ORDERED and UNORDERED float | |
581084df | 1169 | compares. */ |
68cbb7e3 | 1170 | return mode != CC_FPmode; |
1171 | } | |
1172 | ||
1173 | /* DEFAULT_RTX_COSTS. */ | |
1174 | ||
1175 | int | |
1176 | mmix_rtx_cost_recalculated (x, code, outer_code, costp) | |
1177 | rtx x ATTRIBUTE_UNUSED; | |
1178 | RTX_CODE code ATTRIBUTE_UNUSED; | |
1179 | RTX_CODE outer_code ATTRIBUTE_UNUSED; | |
1180 | int *costp ATTRIBUTE_UNUSED; | |
1181 | { | |
1182 | /* For the time being, this is just a stub and we'll accept the | |
1183 | generic calculations, until we can do measurements, at least. | |
1184 | Say we did not modify any calculated costs. */ | |
1185 | return 0; | |
1186 | } | |
1187 | ||
1188 | /* ADDRESS_COST. */ | |
1189 | ||
1190 | int | |
1191 | mmix_address_cost (addr) | |
1192 | rtx addr ATTRIBUTE_UNUSED; | |
1193 | { | |
1194 | /* There's no difference in the address costs and we have lots of | |
1195 | registers. Some targets use constant 0, many others use 1 to say | |
1196 | this. Let's start with 1. */ | |
1197 | return 1; | |
1198 | } | |
1199 | ||
1200 | /* REGISTER_MOVE_COST. */ | |
1201 | ||
1202 | int | |
1203 | mmix_register_move_cost (mode, from, to) | |
1204 | enum machine_mode mode ATTRIBUTE_UNUSED; | |
1205 | enum reg_class from; | |
1206 | enum reg_class to; | |
1207 | { | |
1208 | return (from == GENERAL_REGS && from == to) ? 2 : 3; | |
1209 | } | |
1210 | ||
1211 | /* Note that we don't have a TEXT_SECTION_ASM_OP, because it has to be a | |
1212 | compile-time constant; it's used in an asm in crtstuff.c, compiled for | |
1213 | the target. */ | |
1214 | ||
1215 | /* DATA_SECTION_ASM_OP. */ | |
1216 | ||
1217 | const char * | |
1218 | mmix_data_section_asm_op () | |
1219 | { | |
1220 | return "\t.data ! mmixal:= 8H LOC 9B"; | |
1221 | } | |
1222 | ||
7811991d | 1223 | static void |
ae484cc8 | 1224 | mmix_encode_section_info (decl, first) |
68cbb7e3 | 1225 | tree decl; |
ae484cc8 | 1226 | int first; |
68cbb7e3 | 1227 | { |
1228 | /* Test for an external declaration, and do nothing if it is one. */ | |
1229 | if ((TREE_CODE (decl) == VAR_DECL | |
91009d64 | 1230 | && (DECL_EXTERNAL (decl) || TREE_PUBLIC (decl))) |
1231 | || (TREE_CODE (decl) == FUNCTION_DECL && TREE_PUBLIC (decl))) | |
68cbb7e3 | 1232 | ; |
ae484cc8 | 1233 | else if (first && DECL_P (decl)) |
68cbb7e3 | 1234 | { |
1235 | /* For non-visible declarations, add a "@" prefix, which we skip | |
1236 | when the label is output. If the label does not have this | |
f0b228a5 | 1237 | prefix, a ":" is output if -mtoplevel-symbols. |
68cbb7e3 | 1238 | |
1239 | Note that this does not work for data that is declared extern and | |
1240 | later defined as static. If there's code in between, that code | |
f0b228a5 | 1241 | will refer to the extern declaration, and vice versa. This just |
1242 | means that when -mtoplevel-symbols is in use, we can just handle | |
1243 | well-behaved ISO-compliant code. */ | |
68cbb7e3 | 1244 | |
1245 | const char *str = XSTR (XEXP (DECL_RTL (decl), 0), 0); | |
1246 | int len = strlen (str); | |
1247 | char *newstr; | |
1248 | ||
f0b228a5 | 1249 | /* Why is the return type of ggc_alloc_string const? */ |
1250 | newstr = (char *) ggc_alloc_string ("", len + 1); | |
68cbb7e3 | 1251 | |
1252 | strcpy (newstr + 1, str); | |
1253 | *newstr = '@'; | |
1254 | XSTR (XEXP (DECL_RTL (decl), 0), 0) = newstr; | |
1255 | } | |
1256 | ||
f0b228a5 | 1257 | /* Set SYMBOL_REF_FLAG for things that we want to access with GETA. We |
1258 | may need different options to reach for different things with GETA. | |
1259 | For now, functions and things we know or have been told are constant. */ | |
1260 | if (TREE_CODE (decl) == FUNCTION_DECL | |
1261 | || TREE_CONSTANT (decl) | |
1262 | || (TREE_CODE (decl) == VAR_DECL | |
1263 | && TREE_READONLY (decl) | |
1264 | && !TREE_SIDE_EFFECTS (decl) | |
1265 | && (!DECL_INITIAL (decl) | |
1266 | || TREE_CONSTANT (DECL_INITIAL (decl))))) | |
1267 | { | |
1268 | rtx rtl = (TREE_CODE_CLASS (TREE_CODE (decl)) != 'd' | |
1269 | ? TREE_CST_RTL (decl) : DECL_RTL (decl)); | |
1270 | SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1; | |
1271 | } | |
68cbb7e3 | 1272 | } |
1273 | ||
7b4a38a6 | 1274 | static const char * |
68cbb7e3 | 1275 | mmix_strip_name_encoding (name) |
1276 | const char *name; | |
1277 | { | |
1278 | for (; (*name == '@' || *name == '*'); name++) | |
1279 | ; | |
1280 | ||
1281 | return name; | |
1282 | } | |
1283 | ||
68cbb7e3 | 1284 | /* ASM_FILE_START. */ |
1285 | ||
1286 | void | |
1287 | mmix_asm_file_start (stream) | |
1288 | FILE * stream; | |
1289 | { | |
1290 | /* We just emit a little comment for the time being. FIXME: Perhaps add | |
1291 | -mstandalone and some segment and prefix setup here. */ | |
1292 | ASM_OUTPUT_SOURCE_FILENAME (stream, main_input_filename); | |
1293 | ||
1294 | fprintf (stream, "! mmixal:= 8H LOC Data_Section\n"); | |
1295 | ||
1296 | /* Make sure each file starts with the text section. */ | |
1297 | text_section (); | |
1298 | } | |
1299 | ||
1300 | /* ASM_FILE_END. */ | |
1301 | ||
1302 | void | |
1303 | mmix_asm_file_end (stream) | |
1304 | FILE * stream ATTRIBUTE_UNUSED; | |
1305 | { | |
1306 | /* Make sure each file ends with the data section. */ | |
1307 | data_section (); | |
1308 | } | |
1309 | ||
68cbb7e3 | 1310 | /* ASM_OUTPUT_SOURCE_FILENAME. */ |
1311 | ||
1312 | void | |
1313 | mmix_asm_output_source_filename (stream, name) | |
1314 | FILE * stream; | |
1315 | const char * name; | |
1316 | { | |
1317 | fprintf (stream, "# 1 "); | |
1318 | OUTPUT_QUOTED_STRING (stream, name); | |
1319 | fprintf (stream, "\n"); | |
1320 | } | |
1321 | ||
1322 | /* OUTPUT_QUOTED_STRING. */ | |
1323 | ||
1324 | void | |
1325 | mmix_output_quoted_string (stream, string, length) | |
1326 | FILE * stream; | |
1327 | const char * string; | |
1328 | int length; | |
1329 | { | |
1330 | const char * string_end = string + length; | |
25037517 | 1331 | static const char *const unwanted_chars = "\"[]\\"; |
68cbb7e3 | 1332 | |
1333 | /* Output "any character except newline and double quote character". We | |
1334 | play it safe and avoid all control characters too. We also do not | |
1335 | want [] as characters, should input be passed through m4 with [] as | |
1336 | quotes. Further, we avoid "\", because the GAS port handles it as a | |
1337 | quoting character. */ | |
1338 | while (string < string_end) | |
1339 | { | |
1340 | if (*string | |
1341 | && (unsigned char) *string < 128 | |
1342 | && !ISCNTRL (*string) | |
1343 | && strchr (unwanted_chars, *string) == NULL) | |
1344 | { | |
1345 | fputc ('"', stream); | |
1346 | while (*string | |
1347 | && (unsigned char) *string < 128 | |
1348 | && !ISCNTRL (*string) | |
1349 | && strchr (unwanted_chars, *string) == NULL | |
1350 | && string < string_end) | |
1351 | { | |
1352 | fputc (*string, stream); | |
1353 | string++; | |
1354 | } | |
1355 | fputc ('"', stream); | |
1356 | if (string < string_end) | |
1357 | fprintf (stream, ","); | |
1358 | } | |
1359 | if (string < string_end) | |
1360 | { | |
1361 | fprintf (stream, "#%x", *string & 255); | |
1362 | string++; | |
1363 | if (string < string_end) | |
1364 | fprintf (stream, ","); | |
1365 | } | |
1366 | } | |
1367 | } | |
1368 | ||
1369 | /* ASM_OUTPUT_SOURCE_LINE. */ | |
1370 | ||
1371 | void | |
1372 | mmix_asm_output_source_line (stream, lineno) | |
1373 | FILE * stream; | |
1374 | int lineno; | |
1375 | { | |
1376 | fprintf (stream, "# %d ", lineno); | |
1377 | OUTPUT_QUOTED_STRING (stream, main_input_filename); | |
1378 | fprintf (stream, "\n"); | |
1379 | } | |
1380 | ||
58356836 | 1381 | /* Target hook for assembling integer objects. Use mmix_print_operand |
1382 | for WYDE and TETRA. Use mmix_output_octa to output 8-byte | |
1383 | CONST_DOUBLEs. */ | |
68cbb7e3 | 1384 | |
58356836 | 1385 | static bool |
1386 | mmix_assemble_integer (x, size, aligned_p) | |
1387 | rtx x; | |
1388 | unsigned int size; | |
1389 | int aligned_p; | |
68cbb7e3 | 1390 | { |
58356836 | 1391 | if (aligned_p) |
1392 | switch (size) | |
1393 | { | |
4f4e478d | 1394 | /* We handle a limited number of types of operands in here. But |
1395 | that's ok, because we can punt to generic functions. We then | |
5c3d1711 | 1396 | pretend that aligned data isn't needed, so the usual .<pseudo> |
1397 | syntax is used (which works for aligned data too). We actually | |
1398 | *must* do that, since we say we don't have simple aligned | |
1399 | pseudos, causing this function to be called. We just try and | |
1400 | keep as much compatibility as possible with mmixal syntax for | |
1401 | normal cases (i.e. without GNU extensions and C only). */ | |
58356836 | 1402 | case 1: |
4f4e478d | 1403 | if (GET_CODE (x) != CONST_INT) |
1404 | { | |
1405 | aligned_p = 0; | |
1406 | break; | |
1407 | } | |
58356836 | 1408 | fputs ("\tBYTE\t", asm_out_file); |
1409 | mmix_print_operand (asm_out_file, x, 'B'); | |
1410 | fputc ('\n', asm_out_file); | |
1411 | return true; | |
1412 | ||
1413 | case 2: | |
4f4e478d | 1414 | if (GET_CODE (x) != CONST_INT) |
1415 | { | |
1416 | aligned_p = 0; | |
1417 | break; | |
1418 | } | |
58356836 | 1419 | fputs ("\tWYDE\t", asm_out_file); |
1420 | mmix_print_operand (asm_out_file, x, 'W'); | |
1421 | fputc ('\n', asm_out_file); | |
1422 | return true; | |
1423 | ||
1424 | case 4: | |
60bb373d | 1425 | if (GET_CODE (x) != CONST_INT) |
4f4e478d | 1426 | { |
1427 | aligned_p = 0; | |
1428 | break; | |
1429 | } | |
58356836 | 1430 | fputs ("\tTETRA\t", asm_out_file); |
1431 | mmix_print_operand (asm_out_file, x, 'L'); | |
1432 | fputc ('\n', asm_out_file); | |
1433 | return true; | |
1434 | ||
1435 | case 8: | |
1436 | if (GET_CODE (x) == CONST_DOUBLE) | |
4f4e478d | 1437 | /* We don't get here anymore for CONST_DOUBLE, because DImode |
1438 | isn't expressed as CONST_DOUBLE, and DFmode is handled | |
1439 | elsewhere. */ | |
1440 | abort (); | |
1441 | assemble_integer_with_op ("\tOCTA\t", x); | |
58356836 | 1442 | return true; |
1443 | } | |
1444 | return default_assemble_integer (x, size, aligned_p); | |
68cbb7e3 | 1445 | } |
1446 | ||
1447 | /* ASM_OUTPUT_ASCII. */ | |
1448 | ||
1449 | void | |
1450 | mmix_asm_output_ascii (stream, string, length) | |
1451 | FILE *stream; | |
1452 | const char *string; | |
1453 | int length; | |
1454 | { | |
1455 | while (length > 0) | |
1456 | { | |
1457 | int chunk_size = length > 60 ? 60 : length; | |
1458 | fprintf (stream, "\tBYTE "); | |
1459 | mmix_output_quoted_string (stream, string, chunk_size); | |
1460 | string += chunk_size; | |
1461 | length -= chunk_size; | |
1462 | fprintf (stream, "\n"); | |
1463 | } | |
1464 | } | |
1465 | ||
1466 | /* ASM_OUTPUT_ALIGNED_COMMON. */ | |
1467 | ||
1468 | void | |
1469 | mmix_asm_output_aligned_common (stream, name, size, align) | |
1470 | FILE *stream; | |
1471 | const char *name; | |
1472 | int size; | |
1473 | int align; | |
1474 | { | |
1475 | /* This is mostly the elfos.h one. There doesn't seem to be a way to | |
1476 | express this in a mmixal-compatible way. */ | |
1477 | fprintf (stream, "\t.comm\t"); | |
1478 | assemble_name (stream, name); | |
1479 | fprintf (stream, ",%u,%u ! mmixal-incompatible COMMON\n", | |
1480 | size, align / BITS_PER_UNIT); | |
1481 | } | |
1482 | ||
1483 | /* ASM_OUTPUT_ALIGNED_LOCAL. */ | |
1484 | ||
1485 | void | |
1486 | mmix_asm_output_aligned_local (stream, name, size, align) | |
1487 | FILE * stream; | |
1488 | const char * name; | |
1489 | int size; | |
1490 | int align; | |
1491 | { | |
1492 | data_section (); | |
1493 | ||
1494 | ASM_OUTPUT_ALIGN (stream, exact_log2 (align/BITS_PER_UNIT)); | |
1495 | assemble_name (stream, name); | |
1496 | fprintf (stream, "\tLOC @+%d\n", size); | |
1497 | } | |
1498 | ||
1499 | /* ASM_OUTPUT_LABEL. */ | |
1500 | ||
1501 | void | |
1502 | mmix_asm_output_label (stream, name) | |
1503 | FILE *stream; | |
1504 | const char * name; | |
1505 | { | |
1506 | assemble_name (stream, name); | |
1507 | fprintf (stream, "\tIS @\n"); | |
1508 | } | |
1509 | ||
1510 | /* ASM_DECLARE_REGISTER_GLOBAL. */ | |
1511 | ||
1512 | void | |
1513 | mmix_asm_declare_register_global (stream, decl, regno, name) | |
1514 | FILE *stream ATTRIBUTE_UNUSED; | |
1515 | tree decl ATTRIBUTE_UNUSED; | |
1516 | int regno ATTRIBUTE_UNUSED; | |
1517 | const char *name ATTRIBUTE_UNUSED; | |
1518 | { | |
1519 | /* Nothing to do here, but there *will* be, therefore the framework is | |
1520 | here. */ | |
1521 | } | |
1522 | ||
1523 | /* ASM_GLOBALIZE_LABEL. */ | |
1524 | ||
1525 | void | |
1526 | mmix_asm_globalize_label (stream, name) | |
1527 | FILE * stream ATTRIBUTE_UNUSED; | |
1528 | const char * name ATTRIBUTE_UNUSED; | |
1529 | { | |
1530 | asm_fprintf (stream, "\t.global "); | |
1531 | assemble_name (stream, name); | |
1532 | putc ('\n', stream); | |
1533 | } | |
1534 | ||
1535 | /* ASM_WEAKEN_LABEL. */ | |
1536 | ||
1537 | void | |
1538 | mmix_asm_weaken_label (stream, name) | |
1539 | FILE * stream ATTRIBUTE_UNUSED; | |
1540 | const char * name ATTRIBUTE_UNUSED; | |
1541 | { | |
1542 | asm_fprintf (stream, "\t.weak "); | |
1543 | assemble_name (stream, name); | |
1544 | asm_fprintf (stream, " ! mmixal-incompatible\n"); | |
1545 | } | |
1546 | ||
1547 | /* MAKE_DECL_ONE_ONLY. */ | |
1548 | ||
1549 | void | |
1550 | mmix_make_decl_one_only (decl) | |
1551 | tree decl; | |
1552 | { | |
1553 | DECL_WEAK (decl) = 1; | |
1554 | } | |
1555 | ||
1556 | /* ASM_OUTPUT_LABELREF. | |
1557 | Strip GCC's '*' and our own '@'. No order is assumed. */ | |
1558 | ||
1559 | void | |
1560 | mmix_asm_output_labelref (stream, name) | |
1561 | FILE *stream; | |
1562 | const char *name; | |
1563 | { | |
91009d64 | 1564 | int is_extern = 1; |
68cbb7e3 | 1565 | |
1566 | for (; (*name == '@' || *name == '*'); name++) | |
1567 | if (*name == '@') | |
91009d64 | 1568 | is_extern = 0; |
68cbb7e3 | 1569 | |
1570 | asm_fprintf (stream, "%s%U%s", | |
1571 | is_extern && TARGET_TOPLEVEL_SYMBOLS ? ":" : "", | |
1572 | name); | |
1573 | } | |
1574 | ||
1575 | /* ASM_OUTPUT_INTERNAL_LABEL. */ | |
1576 | ||
1577 | void | |
1578 | mmix_asm_output_internal_label (stream, name, num) | |
1579 | FILE * stream; | |
1580 | const char * name; | |
1581 | int num; | |
1582 | { | |
1583 | fprintf (stream, "%s:%d\tIS @\n", name, num); | |
1584 | } | |
1585 | ||
1586 | /* ASM_OUTPUT_DEF. */ | |
1587 | ||
1588 | void | |
1589 | mmix_asm_output_def (stream, name, value) | |
1590 | FILE * stream; | |
1591 | const char * name; | |
1592 | const char * value; | |
1593 | { | |
1594 | assemble_name (stream, name); | |
1595 | fprintf (stream, "\tIS "); | |
1596 | assemble_name (stream, value); | |
1597 | fputc ('\n', stream); | |
1598 | } | |
1599 | ||
68cbb7e3 | 1600 | /* PRINT_OPERAND. */ |
1601 | ||
1602 | void | |
1603 | mmix_print_operand (stream, x, code) | |
1604 | FILE * stream; | |
1605 | rtx x; | |
1606 | int code; | |
1607 | { | |
1608 | /* When we add support for different codes later, we can, when needed, | |
1609 | drop through to the main handler with a modified operand. */ | |
1610 | rtx modified_x = x; | |
d68ffc6f | 1611 | int regno = x != NULL_RTX && REG_P (x) ? REGNO (x) : 0; |
68cbb7e3 | 1612 | |
1613 | switch (code) | |
1614 | { | |
1615 | /* Unrelated codes are in alphabetic order. */ | |
1616 | ||
91009d64 | 1617 | case '+': |
1618 | /* For conditional branches, output "P" for a probable branch. */ | |
1619 | if (TARGET_BRANCH_PREDICT) | |
1620 | { | |
1621 | x = find_reg_note (current_output_insn, REG_BR_PROB, 0); | |
1622 | if (x && INTVAL (XEXP (x, 0)) > REG_BR_PROB_BASE / 2) | |
1623 | putc ('P', stream); | |
1624 | } | |
1625 | return; | |
1626 | ||
0b123c47 | 1627 | case '.': |
1628 | /* For the %d in POP %d,0. */ | |
1629 | fprintf (stream, "%d", MMIX_POP_ARGUMENT ()); | |
1630 | return; | |
1631 | ||
68cbb7e3 | 1632 | case 'B': |
1633 | if (GET_CODE (x) != CONST_INT) | |
1634 | fatal_insn ("MMIX Internal: Expected a CONST_INT, not this", x); | |
1635 | fprintf (stream, "%d", (int) (INTVAL (x) & 0xff)); | |
1636 | return; | |
1637 | ||
1638 | case 'H': | |
1639 | /* Highpart. Must be general register, and not the last one, as | |
1640 | that one cannot be part of a consecutive register pair. */ | |
d68ffc6f | 1641 | if (regno > MMIX_LAST_GENERAL_REGISTER - 1) |
1642 | internal_error ("MMIX Internal: Bad register: %d", regno); | |
68cbb7e3 | 1643 | |
1644 | /* This is big-endian, so the high-part is the first one. */ | |
d68ffc6f | 1645 | fprintf (stream, "%s", reg_names[MMIX_OUTPUT_REGNO (regno)]); |
68cbb7e3 | 1646 | return; |
1647 | ||
1648 | case 'L': | |
1649 | /* Lowpart. Must be CONST_INT or general register, and not the last | |
1650 | one, as that one cannot be part of a consecutive register pair. */ | |
1651 | if (GET_CODE (x) == CONST_INT) | |
1652 | { | |
1653 | fprintf (stream, "#%lx", | |
1654 | (unsigned long) (INTVAL (x) | |
1655 | & ((unsigned int) 0x7fffffff * 2 + 1))); | |
1656 | return; | |
1657 | } | |
1658 | ||
1659 | if (GET_CODE (x) == SYMBOL_REF) | |
1660 | { | |
1661 | output_addr_const (stream, x); | |
1662 | return; | |
1663 | } | |
1664 | ||
d68ffc6f | 1665 | if (regno > MMIX_LAST_GENERAL_REGISTER - 1) |
1666 | internal_error ("MMIX Internal: Bad register: %d", regno); | |
68cbb7e3 | 1667 | |
1668 | /* This is big-endian, so the low-part is + 1. */ | |
d68ffc6f | 1669 | fprintf (stream, "%s", reg_names[MMIX_OUTPUT_REGNO (regno) + 1]); |
68cbb7e3 | 1670 | return; |
1671 | ||
1672 | /* Can't use 'a' because that's a generic modifier for address | |
1673 | output. */ | |
1674 | case 'A': | |
1675 | mmix_output_shiftvalue_op_from_str (stream, "ANDN", | |
1676 | ~(unsigned HOST_WIDEST_INT) | |
1677 | mmix_intval (x)); | |
1678 | return; | |
1679 | ||
1680 | case 'i': | |
1681 | mmix_output_shiftvalue_op_from_str (stream, "INC", | |
1682 | (unsigned HOST_WIDEST_INT) | |
1683 | mmix_intval (x)); | |
1684 | return; | |
1685 | ||
1686 | case 'o': | |
1687 | mmix_output_shiftvalue_op_from_str (stream, "OR", | |
1688 | (unsigned HOST_WIDEST_INT) | |
1689 | mmix_intval (x)); | |
1690 | return; | |
1691 | ||
1692 | case 's': | |
1693 | mmix_output_shiftvalue_op_from_str (stream, "SET", | |
1694 | (unsigned HOST_WIDEST_INT) | |
1695 | mmix_intval (x)); | |
1696 | return; | |
1697 | ||
1698 | case 'd': | |
1699 | case 'D': | |
1700 | mmix_output_condition (stream, x, (code == 'D')); | |
1701 | return; | |
1702 | ||
1703 | case 'e': | |
1704 | /* Output an extra "e" to make fcmpe, fune. */ | |
1705 | if (TARGET_FCMP_EPSILON) | |
1706 | fprintf (stream, "e"); | |
1707 | return; | |
1708 | ||
1709 | case 'm': | |
1710 | /* Output the number minus 1. */ | |
1711 | if (GET_CODE (x) != CONST_INT) | |
1712 | { | |
1713 | fatal_insn ("MMIX Internal: Bad value for 'm', not a CONST_INT", | |
1714 | x); | |
1715 | } | |
1716 | fprintf (stream, HOST_WIDEST_INT_PRINT_DEC, | |
1717 | (HOST_WIDEST_INT) (mmix_intval (x) - 1)); | |
1718 | return; | |
1719 | ||
1720 | case 'p': | |
1721 | /* Store the number of registers we want to save. This was setup | |
1722 | by the prologue. The actual operand contains the number of | |
1723 | registers to pass, but we don't use it currently. Anyway, we | |
1724 | need to output the number of saved registers here. */ | |
d68ffc6f | 1725 | fprintf (stream, "%d", |
1726 | cfun->machine->highest_saved_stack_register + 1); | |
68cbb7e3 | 1727 | return; |
1728 | ||
1729 | case 'r': | |
1730 | /* Store the register to output a constant to. */ | |
1731 | if (! REG_P (x)) | |
68435912 | 1732 | fatal_insn ("MMIX Internal: Expected a register, not this", x); |
d68ffc6f | 1733 | mmix_output_destination_register = MMIX_OUTPUT_REGNO (regno); |
68cbb7e3 | 1734 | return; |
1735 | ||
1736 | case 'I': | |
1737 | /* Output the constant. Note that we use this for floats as well. */ | |
1738 | if (GET_CODE (x) != CONST_INT | |
1739 | && (GET_CODE (x) != CONST_DOUBLE | |
1740 | || (GET_MODE (x) != VOIDmode && GET_MODE (x) != DFmode | |
1741 | && GET_MODE (x) != SFmode))) | |
68435912 | 1742 | fatal_insn ("MMIX Internal: Expected a constant, not this", x); |
68cbb7e3 | 1743 | mmix_output_register_setting (stream, |
1744 | mmix_output_destination_register, | |
1745 | mmix_intval (x), 0); | |
1746 | return; | |
1747 | ||
1748 | case 'U': | |
1749 | /* An U for unsigned, if TARGET_ZERO_EXTEND. Ignore the operand. */ | |
1750 | if (TARGET_ZERO_EXTEND) | |
1751 | putc ('U', stream); | |
1752 | return; | |
1753 | ||
1754 | case 'v': | |
1755 | mmix_output_shifted_value (stream, (HOST_WIDEST_INT) mmix_intval (x)); | |
1756 | return; | |
1757 | ||
1758 | case 'V': | |
1759 | mmix_output_shifted_value (stream, (HOST_WIDEST_INT) ~mmix_intval (x)); | |
1760 | return; | |
1761 | ||
1762 | case 'W': | |
1763 | if (GET_CODE (x) != CONST_INT) | |
1764 | fatal_insn ("MMIX Internal: Expected a CONST_INT, not this", x); | |
1765 | fprintf (stream, "#%x", (int) (INTVAL (x) & 0xffff)); | |
1766 | return; | |
1767 | ||
1768 | case 0: | |
1769 | /* Nothing to do. */ | |
1770 | break; | |
1771 | ||
1772 | default: | |
1773 | /* Presumably there's a missing case above if we get here. */ | |
1774 | internal_error ("MMIX Internal: Missing `%c' case in mmix_print_operand", code); | |
1775 | } | |
1776 | ||
1777 | switch (GET_CODE (modified_x)) | |
1778 | { | |
1779 | case REG: | |
d68ffc6f | 1780 | regno = REGNO (modified_x); |
1781 | if (regno >= FIRST_PSEUDO_REGISTER) | |
1782 | internal_error ("MMIX Internal: Bad register: %d", regno); | |
1783 | fprintf (stream, "%s", reg_names[MMIX_OUTPUT_REGNO (regno)]); | |
68cbb7e3 | 1784 | return; |
1785 | ||
1786 | case MEM: | |
1787 | output_address (XEXP (modified_x, 0)); | |
1788 | return; | |
1789 | ||
1790 | case CONST_INT: | |
1791 | /* For -2147483648, mmixal complains that the constant does not fit | |
1792 | in 4 bytes, so let's output it as hex. Take care to handle hosts | |
1793 | where HOST_WIDE_INT is longer than an int. | |
1794 | ||
1795 | Print small constants +-255 using decimal. */ | |
1796 | ||
1797 | if (INTVAL (modified_x) > -256 && INTVAL (modified_x) < 256) | |
1798 | fprintf (stream, "%d", (int) (INTVAL (modified_x))); | |
1799 | else | |
1800 | fprintf (stream, "#%x", | |
1801 | (int) (INTVAL (modified_x)) & (unsigned int) ~0); | |
1802 | return; | |
1803 | ||
1804 | case CONST_DOUBLE: | |
1805 | /* Do somewhat as CONST_INT. */ | |
58356836 | 1806 | mmix_output_octa (stream, mmix_intval (modified_x), 0); |
68cbb7e3 | 1807 | return; |
1808 | ||
1809 | case CONST: | |
1810 | output_addr_const (stream, modified_x); | |
1811 | return; | |
1812 | ||
1813 | default: | |
1814 | /* No need to test for all strange things. Let output_addr_const do | |
1815 | it for us. */ | |
1816 | if (CONSTANT_P (modified_x) | |
1817 | /* Strangely enough, this is not included in CONSTANT_P. | |
1818 | FIXME: Ask/check about sanity here. */ | |
1819 | || GET_CODE (modified_x) == CODE_LABEL) | |
1820 | { | |
1821 | output_addr_const (stream, modified_x); | |
1822 | return; | |
1823 | } | |
1824 | ||
1825 | /* We need the original here. */ | |
1826 | fatal_insn ("MMIX Internal: Cannot decode this operand", x); | |
1827 | } | |
1828 | } | |
1829 | ||
1830 | /* PRINT_OPERAND_PUNCT_VALID_P. */ | |
1831 | ||
1832 | int | |
1833 | mmix_print_operand_punct_valid_p (code) | |
1834 | int code ATTRIBUTE_UNUSED; | |
1835 | { | |
91009d64 | 1836 | /* A '+' is used for branch prediction, similar to other ports. */ |
0b123c47 | 1837 | return code == '+' |
1838 | /* A '.' is used for the %d in the POP %d,0 return insn. */ | |
1839 | || code == '.'; | |
68cbb7e3 | 1840 | } |
1841 | ||
1842 | /* PRINT_OPERAND_ADDRESS. */ | |
1843 | ||
1844 | void | |
1845 | mmix_print_operand_address (stream, x) | |
1846 | FILE *stream; | |
1847 | rtx x; | |
1848 | { | |
1849 | if (REG_P (x)) | |
1850 | { | |
1851 | /* I find the generated assembly code harder to read without | |
1852 | the ",0". */ | |
d68ffc6f | 1853 | fprintf (stream, "%s,0", reg_names[MMIX_OUTPUT_REGNO (REGNO (x))]); |
68cbb7e3 | 1854 | return; |
1855 | } | |
1856 | else if (GET_CODE (x) == PLUS) | |
1857 | { | |
1858 | rtx x1 = XEXP (x, 0); | |
1859 | rtx x2 = XEXP (x, 1); | |
1860 | ||
68cbb7e3 | 1861 | if (REG_P (x1)) |
1862 | { | |
d68ffc6f | 1863 | fprintf (stream, "%s,", reg_names[MMIX_OUTPUT_REGNO (REGNO (x1))]); |
68cbb7e3 | 1864 | |
1865 | if (REG_P (x2)) | |
1866 | { | |
d68ffc6f | 1867 | fprintf (stream, "%s", |
1868 | reg_names[MMIX_OUTPUT_REGNO (REGNO (x2))]); | |
68cbb7e3 | 1869 | return; |
1870 | } | |
1871 | else if (GET_CODE (x2) == CONST_INT | |
1872 | && CONST_OK_FOR_LETTER_P (INTVAL (x2), 'I')) | |
1873 | { | |
1874 | output_addr_const (stream, x2); | |
1875 | return; | |
1876 | } | |
1877 | } | |
1878 | } | |
1879 | ||
f0b228a5 | 1880 | if (TARGET_BASE_ADDRESSES && mmix_legitimate_constant_p (x)) |
1881 | { | |
1882 | output_addr_const (stream, x); | |
1883 | return; | |
1884 | } | |
1885 | ||
68cbb7e3 | 1886 | fatal_insn ("MMIX Internal: This is not a recognized address", x); |
1887 | } | |
1888 | ||
1889 | /* ASM_OUTPUT_REG_PUSH. */ | |
1890 | ||
1891 | void | |
1892 | mmix_asm_output_reg_push (stream, regno) | |
1893 | FILE * stream; | |
1894 | int regno; | |
1895 | { | |
1896 | fprintf (stream, "\tSUBU %s,%s,8\n\tSTOU %s,%s,0\n", | |
1897 | reg_names[MMIX_STACK_POINTER_REGNUM], | |
1898 | reg_names[MMIX_STACK_POINTER_REGNUM], | |
d68ffc6f | 1899 | reg_names[MMIX_OUTPUT_REGNO (regno)], |
68cbb7e3 | 1900 | reg_names[MMIX_STACK_POINTER_REGNUM]); |
1901 | } | |
1902 | ||
1903 | /* ASM_OUTPUT_REG_POP. */ | |
1904 | ||
1905 | void | |
1906 | mmix_asm_output_reg_pop (stream, regno) | |
1907 | FILE * stream; | |
1908 | int regno; | |
1909 | { | |
1910 | fprintf (stream, "\tLDOU %s,%s,0\n\tINCL %s,8\n", | |
d68ffc6f | 1911 | reg_names[MMIX_OUTPUT_REGNO (regno)], |
68cbb7e3 | 1912 | reg_names[MMIX_STACK_POINTER_REGNUM], |
1913 | reg_names[MMIX_STACK_POINTER_REGNUM]); | |
1914 | } | |
1915 | ||
1916 | /* ASM_OUTPUT_ADDR_DIFF_ELT. */ | |
1917 | ||
1918 | void | |
1919 | mmix_asm_output_addr_diff_elt (stream, body, value, rel) | |
1920 | FILE *stream; | |
1921 | rtx body ATTRIBUTE_UNUSED; | |
1922 | int value; | |
1923 | int rel; | |
1924 | { | |
1925 | fprintf (stream, "\tTETRA L%d-L%d\n", value, rel); | |
1926 | } | |
1927 | ||
1928 | /* ASM_OUTPUT_ADDR_VEC_ELT. */ | |
1929 | ||
1930 | void | |
1931 | mmix_asm_output_addr_vec_elt (stream, value) | |
1932 | FILE *stream; | |
1933 | int value; | |
1934 | { | |
1935 | fprintf (stream, "\tOCTA L:%d\n", value); | |
1936 | } | |
1937 | ||
1938 | /* ASM_OUTPUT_SKIP. */ | |
1939 | ||
1940 | void | |
1941 | mmix_asm_output_skip (stream, nbytes) | |
1942 | FILE *stream; | |
1943 | int nbytes; | |
1944 | { | |
1945 | fprintf (stream, "\tLOC @+%d\n", nbytes); | |
1946 | } | |
1947 | ||
1948 | /* ASM_OUTPUT_ALIGN. */ | |
1949 | ||
1950 | void | |
1951 | mmix_asm_output_align (stream, power) | |
1952 | FILE *stream; | |
1953 | int power; | |
1954 | { | |
1955 | /* We need to record the needed alignment of this section in the object, | |
1956 | so we have to output an alignment directive. Use a .p2align (not | |
1957 | .align) so people will never have to wonder about whether the | |
1958 | argument is in number of bytes or the log2 thereof. We do it in | |
1959 | addition to the LOC directive, so nothing needs tweaking when | |
1960 | copy-pasting assembly into mmixal. */ | |
1961 | fprintf (stream, "\t.p2align %d\n", power); | |
1962 | fprintf (stream, "\tLOC @+(%d-@)&%d\n", 1 << power, (1 << power) - 1); | |
1963 | } | |
1964 | ||
1965 | /* DBX_REGISTER_NUMBER. */ | |
1966 | ||
1967 | int | |
1968 | mmix_dbx_register_number (regno) | |
1969 | int regno; | |
1970 | { | |
d68ffc6f | 1971 | /* Adjust the register number to the one it will be output as, dammit. |
1972 | It'd be nice if we could check the assumption that we're filling a | |
1973 | gap, but every register between the last saved register and parameter | |
1974 | registers might be a valid parameter register. */ | |
1975 | regno = MMIX_OUTPUT_REGNO (regno); | |
68cbb7e3 | 1976 | |
1977 | /* We need to renumber registers to get the number of the return address | |
1978 | register in the range 0..255. It is also space-saving if registers | |
1979 | mentioned in the call-frame information (which uses this function by | |
1980 | defaulting DWARF_FRAME_REGNUM to DBX_REGISTER_NUMBER) are numbered | |
1981 | 0 .. 63. So map 224 .. 256+15 -> 0 .. 47 and 0 .. 223 -> 48..223+48. */ | |
1982 | return regno >= 224 ? (regno - 224) : (regno + 48); | |
1983 | } | |
1984 | ||
35a3065a | 1985 | /* End of target macro support functions. |
68cbb7e3 | 1986 | |
1987 | Now MMIX's own functions. First the exported ones. */ | |
1988 | ||
d3310704 | 1989 | /* Wrapper for get_hard_reg_initial_val since integrate.h isn't included |
1990 | from insn-emit.c. */ | |
1991 | ||
1992 | rtx | |
1993 | mmix_get_hard_reg_initial_val (mode, regno) | |
1994 | enum machine_mode mode; | |
1995 | int regno; | |
1996 | { | |
1997 | return get_hard_reg_initial_val (mode, regno); | |
1998 | } | |
1999 | ||
0b123c47 | 2000 | /* Non-zero when the function epilogue is simple enough that a single |
d3310704 | 2001 | "POP %d,0" should be used even within the function. */ |
0b123c47 | 2002 | |
2003 | int | |
2004 | mmix_use_simple_return () | |
2005 | { | |
2006 | int regno; | |
2007 | ||
2008 | int stack_space_to_allocate | |
2009 | = (current_function_outgoing_args_size | |
2010 | + current_function_pretend_args_size | |
2011 | + get_frame_size () + 7) & ~7; | |
2012 | ||
2013 | if (!TARGET_USE_RETURN_INSN || !reload_completed) | |
2014 | return 0; | |
2015 | ||
2016 | for (regno = 255; | |
2017 | regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
2018 | regno--) | |
2019 | /* Note that we assume that the frame-pointer-register is one of these | |
2020 | registers, in which case we don't count it here. */ | |
2021 | if ((((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
2022 | && regs_ever_live[regno] && !call_used_regs[regno])) | |
2023 | || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
2024 | return 0; | |
2025 | ||
2026 | if (frame_pointer_needed) | |
2027 | stack_space_to_allocate += 8; | |
2028 | ||
2029 | if (MMIX_CFUN_HAS_LANDING_PAD) | |
2030 | stack_space_to_allocate += 16; | |
2031 | else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
2032 | stack_space_to_allocate += 8; | |
2033 | ||
2034 | return stack_space_to_allocate == 0; | |
2035 | } | |
2036 | ||
d3310704 | 2037 | |
2038 | /* Expands the function prologue into RTX. */ | |
2039 | ||
2040 | void | |
2041 | mmix_expand_prologue () | |
2042 | { | |
2043 | HOST_WIDE_INT locals_size = get_frame_size (); | |
2044 | int regno; | |
2045 | HOST_WIDE_INT stack_space_to_allocate | |
2046 | = (current_function_outgoing_args_size | |
2047 | + current_function_pretend_args_size | |
2048 | + locals_size + 7) & ~7; | |
2049 | HOST_WIDE_INT offset = -8; | |
2050 | ||
2051 | /* Add room needed to save global non-register-stack registers. */ | |
2052 | for (regno = 255; | |
2053 | regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
2054 | regno--) | |
2055 | /* Note that we assume that the frame-pointer-register is one of these | |
2056 | registers, in which case we don't count it here. */ | |
2057 | if ((((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
2058 | && regs_ever_live[regno] && !call_used_regs[regno])) | |
2059 | || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
2060 | stack_space_to_allocate += 8; | |
2061 | ||
2062 | /* If we do have a frame-pointer, add room for it. */ | |
2063 | if (frame_pointer_needed) | |
2064 | stack_space_to_allocate += 8; | |
2065 | ||
2066 | /* If we have a non-local label, we need to be able to unwind to it, so | |
2067 | store the current register stack pointer. Also store the return | |
2068 | address if we do that. */ | |
2069 | if (MMIX_CFUN_HAS_LANDING_PAD) | |
2070 | stack_space_to_allocate += 16; | |
2071 | else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
2072 | /* If we do have a saved return-address slot, add room for it. */ | |
2073 | stack_space_to_allocate += 8; | |
2074 | ||
2075 | /* Make sure we don't get an unaligned stack. */ | |
2076 | if ((stack_space_to_allocate % 8) != 0) | |
2077 | internal_error ("stack frame not a multiple of 8 bytes: %d", | |
2078 | stack_space_to_allocate); | |
2079 | ||
2080 | if (current_function_pretend_args_size) | |
2081 | { | |
2082 | int mmix_first_vararg_reg | |
2083 | = (MMIX_FIRST_INCOMING_ARG_REGNUM | |
2084 | + (MMIX_MAX_ARGS_IN_REGS | |
2085 | - current_function_pretend_args_size / 8)); | |
2086 | ||
2087 | for (regno | |
2088 | = MMIX_FIRST_INCOMING_ARG_REGNUM + MMIX_MAX_ARGS_IN_REGS - 1; | |
2089 | regno >= mmix_first_vararg_reg; | |
2090 | regno--) | |
2091 | { | |
2092 | if (offset < 0) | |
2093 | { | |
2094 | HOST_WIDE_INT stack_chunk | |
2095 | = stack_space_to_allocate > (256 - 8) | |
2096 | ? (256 - 8) : stack_space_to_allocate; | |
2097 | ||
2098 | mmix_emit_sp_add (-stack_chunk); | |
2099 | offset += stack_chunk; | |
2100 | stack_space_to_allocate -= stack_chunk; | |
2101 | } | |
2102 | ||
2103 | /* These registers aren't actually saved (as in "will be | |
2104 | restored"), so don't tell DWARF2 they're saved. */ | |
2105 | emit_move_insn (gen_rtx_MEM (DImode, | |
2106 | plus_constant (stack_pointer_rtx, | |
2107 | offset)), | |
2108 | gen_rtx_REG (DImode, regno)); | |
2109 | offset -= 8; | |
2110 | } | |
2111 | } | |
2112 | ||
2113 | /* Store the frame-pointer. */ | |
2114 | ||
2115 | if (frame_pointer_needed) | |
2116 | { | |
2117 | rtx insn; | |
2118 | ||
2119 | if (offset < 0) | |
2120 | { | |
2121 | /* Get 8 less than otherwise, since we need to reach offset + 8. */ | |
2122 | HOST_WIDE_INT stack_chunk | |
2123 | = stack_space_to_allocate > (256 - 8 - 8) | |
2124 | ? (256 - 8 - 8) : stack_space_to_allocate; | |
2125 | ||
2126 | mmix_emit_sp_add (-stack_chunk); | |
2127 | ||
2128 | offset += stack_chunk; | |
2129 | stack_space_to_allocate -= stack_chunk; | |
2130 | } | |
2131 | ||
2132 | insn = emit_move_insn (gen_rtx_MEM (DImode, | |
2133 | plus_constant (stack_pointer_rtx, | |
2134 | offset)), | |
2135 | hard_frame_pointer_rtx); | |
2136 | RTX_FRAME_RELATED_P (insn) = 1; | |
2137 | insn = emit_insn (gen_adddi3 (hard_frame_pointer_rtx, | |
2138 | stack_pointer_rtx, | |
2139 | GEN_INT (offset + 8))); | |
2140 | RTX_FRAME_RELATED_P (insn) = 1; | |
2141 | offset -= 8; | |
2142 | } | |
2143 | ||
2144 | if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
2145 | { | |
2146 | rtx tmpreg, retreg; | |
2147 | rtx insn; | |
2148 | ||
2149 | /* Store the return-address, if one is needed on the stack. We | |
2150 | usually store it in a register when needed, but that doesn't work | |
2151 | with -fexceptions. */ | |
2152 | ||
2153 | if (offset < 0) | |
2154 | { | |
2155 | /* Get 8 less than otherwise, since we need to reach offset + 8. */ | |
2156 | HOST_WIDE_INT stack_chunk | |
2157 | = stack_space_to_allocate > (256 - 8 - 8) | |
2158 | ? (256 - 8 - 8) : stack_space_to_allocate; | |
2159 | ||
2160 | mmix_emit_sp_add (-stack_chunk); | |
2161 | ||
2162 | offset += stack_chunk; | |
2163 | stack_space_to_allocate -= stack_chunk; | |
2164 | } | |
2165 | ||
2166 | tmpreg = gen_rtx_REG (DImode, 255); | |
2167 | retreg = gen_rtx_REG (DImode, MMIX_rJ_REGNUM); | |
2168 | ||
2169 | /* Dwarf2 code is confused by the use of a temporary register for | |
2170 | storing the return address, so we have to express it as a note, | |
2171 | which we attach to the actual store insn. */ | |
2172 | emit_move_insn (tmpreg, retreg); | |
2173 | ||
2174 | insn = emit_move_insn (gen_rtx_MEM (DImode, | |
2175 | plus_constant (stack_pointer_rtx, | |
2176 | offset)), | |
2177 | tmpreg); | |
2178 | RTX_FRAME_RELATED_P (insn) = 1; | |
2179 | REG_NOTES (insn) | |
2180 | = gen_rtx_EXPR_LIST (REG_FRAME_RELATED_EXPR, | |
2181 | gen_rtx_SET (VOIDmode, | |
2182 | gen_rtx_MEM (DImode, | |
2183 | plus_constant (stack_pointer_rtx, | |
2184 | offset)), | |
2185 | retreg), | |
2186 | REG_NOTES (insn)); | |
2187 | ||
2188 | offset -= 8; | |
2189 | } | |
2190 | else if (MMIX_CFUN_HAS_LANDING_PAD) | |
2191 | offset -= 8; | |
2192 | ||
2193 | if (MMIX_CFUN_HAS_LANDING_PAD) | |
2194 | { | |
2195 | /* Store the register defining the numbering of local registers, so | |
2196 | we know how long to unwind the register stack. */ | |
2197 | ||
2198 | if (offset < 0) | |
2199 | { | |
2200 | /* Get 8 less than otherwise, since we need to reach offset + 8. */ | |
2201 | HOST_WIDE_INT stack_chunk | |
2202 | = stack_space_to_allocate > (256 - 8 - 8) | |
2203 | ? (256 - 8 - 8) : stack_space_to_allocate; | |
2204 | ||
2205 | mmix_emit_sp_add (-stack_chunk); | |
2206 | ||
2207 | offset += stack_chunk; | |
2208 | stack_space_to_allocate -= stack_chunk; | |
2209 | } | |
2210 | ||
2211 | /* We don't tell dwarf2 about this one; we just have it to unwind | |
2212 | the register stack at landing pads. FIXME: It's a kludge because | |
2213 | we can't describe the effect of the PUSHJ and PUSHGO insns on the | |
2214 | register stack at the moment. Best thing would be to handle it | |
2215 | like stack-pointer offsets. Better: some hook into dwarf2out.c | |
2216 | to produce DW_CFA_expression:s that specify the increment of rO, | |
2217 | and unwind it at eh_return (preferred) or at the landing pad. | |
2218 | Then saves to $0..$G-1 could be specified through that register. */ | |
2219 | ||
2220 | emit_move_insn (gen_rtx_REG (DImode, 255), | |
2221 | gen_rtx_REG (DImode, | |
2222 | MMIX_rO_REGNUM)); | |
2223 | emit_move_insn (gen_rtx_MEM (DImode, | |
2224 | plus_constant (stack_pointer_rtx, offset)), | |
2225 | gen_rtx_REG (DImode, 255)); | |
2226 | offset -= 8; | |
2227 | } | |
2228 | ||
2229 | /* After the return-address and the frame-pointer, we have the local | |
2230 | variables. They're the ones that may have an "unaligned" size. */ | |
2231 | offset -= (locals_size + 7) & ~7; | |
2232 | ||
2233 | /* Now store all registers that are global, i.e. not saved by the | |
2234 | register file machinery. | |
2235 | ||
2236 | It is assumed that the frame-pointer is one of these registers, so it | |
2237 | is explicitly excluded in the count. */ | |
2238 | ||
2239 | for (regno = 255; | |
2240 | regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
2241 | regno--) | |
2242 | if (((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
2243 | && regs_ever_live[regno] && ! call_used_regs[regno]) | |
2244 | || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
2245 | { | |
2246 | rtx insn; | |
2247 | ||
2248 | if (offset < 0) | |
2249 | { | |
2250 | HOST_WIDE_INT stack_chunk | |
2251 | = (stack_space_to_allocate > (256 - offset - 8) | |
2252 | ? (256 - offset - 8) : stack_space_to_allocate); | |
2253 | ||
2254 | mmix_emit_sp_add (-stack_chunk); | |
2255 | offset += stack_chunk; | |
2256 | stack_space_to_allocate -= stack_chunk; | |
2257 | } | |
2258 | ||
2259 | insn = emit_move_insn (gen_rtx_MEM (DImode, | |
2260 | plus_constant (stack_pointer_rtx, | |
2261 | offset)), | |
2262 | gen_rtx_REG (DImode, regno)); | |
2263 | RTX_FRAME_RELATED_P (insn) = 1; | |
2264 | offset -= 8; | |
2265 | } | |
2266 | ||
2267 | /* Finally, allocate room for outgoing args and local vars if room | |
2268 | wasn't allocated above. */ | |
2269 | if (stack_space_to_allocate) | |
2270 | mmix_emit_sp_add (-stack_space_to_allocate); | |
2271 | } | |
2272 | ||
2273 | /* Expands the function epilogue into RTX. */ | |
2274 | ||
2275 | void | |
2276 | mmix_expand_epilogue () | |
2277 | { | |
2278 | HOST_WIDE_INT locals_size = get_frame_size (); | |
2279 | int regno; | |
2280 | HOST_WIDE_INT stack_space_to_deallocate | |
2281 | = (current_function_outgoing_args_size | |
2282 | + current_function_pretend_args_size | |
2283 | + locals_size + 7) & ~7; | |
2284 | ||
2285 | /* The assumption that locals_size fits in an int is asserted in | |
2286 | mmix_expand_prologue. */ | |
2287 | ||
2288 | /* The first address to access is beyond the outgoing_args area. */ | |
2289 | int offset = current_function_outgoing_args_size; | |
2290 | ||
2291 | /* Add the space for global non-register-stack registers. | |
2292 | It is assumed that the frame-pointer register can be one of these | |
2293 | registers, in which case it is excluded from the count when needed. */ | |
2294 | for (regno = 255; | |
2295 | regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
2296 | regno--) | |
2297 | if (((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
2298 | && regs_ever_live[regno] && !call_used_regs[regno]) | |
2299 | || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
2300 | stack_space_to_deallocate += 8; | |
2301 | ||
2302 | /* Add in the space for register stack-pointer. If so, always add room | |
2303 | for the saved PC. */ | |
2304 | if (MMIX_CFUN_HAS_LANDING_PAD) | |
2305 | stack_space_to_deallocate += 16; | |
2306 | else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
2307 | /* If we have a saved return-address slot, add it in. */ | |
2308 | stack_space_to_deallocate += 8; | |
2309 | ||
2310 | /* Add in the frame-pointer. */ | |
2311 | if (frame_pointer_needed) | |
2312 | stack_space_to_deallocate += 8; | |
2313 | ||
2314 | /* Make sure we don't get an unaligned stack. */ | |
2315 | if ((stack_space_to_deallocate % 8) != 0) | |
2316 | internal_error ("stack frame not a multiple of octabyte: %d", | |
2317 | stack_space_to_deallocate); | |
2318 | ||
2319 | /* We will add back small offsets to the stack pointer as we go. | |
2320 | First, we restore all registers that are global, i.e. not saved by | |
2321 | the register file machinery. */ | |
2322 | ||
2323 | for (regno = MMIX_FIRST_GLOBAL_REGNUM; | |
2324 | regno <= 255; | |
2325 | regno++) | |
2326 | if (((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
2327 | && regs_ever_live[regno] && !call_used_regs[regno]) | |
2328 | || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
2329 | { | |
2330 | if (offset > 255) | |
2331 | { | |
2332 | mmix_emit_sp_add (offset); | |
2333 | stack_space_to_deallocate -= offset; | |
2334 | offset = 0; | |
2335 | } | |
2336 | ||
2337 | emit_move_insn (gen_rtx_REG (DImode, regno), | |
2338 | gen_rtx_MEM (DImode, | |
2339 | plus_constant (stack_pointer_rtx, | |
2340 | offset))); | |
2341 | offset += 8; | |
2342 | } | |
2343 | ||
2344 | /* Here is where the local variables were. As in the prologue, they | |
2345 | might be of an unaligned size. */ | |
2346 | offset += (locals_size + 7) & ~7; | |
2347 | ||
2348 | ||
2349 | /* The saved register stack pointer is just below the frame-pointer | |
2350 | register. We don't need to restore it "manually"; the POP | |
2351 | instruction does that. */ | |
2352 | if (MMIX_CFUN_HAS_LANDING_PAD) | |
2353 | offset += 16; | |
2354 | else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
2355 | /* The return-address slot is just below the frame-pointer register. | |
2356 | We don't need to restore it because we don't really use it. */ | |
2357 | offset += 8; | |
2358 | ||
2359 | /* Get back the old frame-pointer-value. */ | |
2360 | if (frame_pointer_needed) | |
2361 | { | |
2362 | if (offset > 255) | |
2363 | { | |
2364 | mmix_emit_sp_add (offset); | |
2365 | ||
2366 | stack_space_to_deallocate -= offset; | |
2367 | offset = 0; | |
2368 | } | |
2369 | ||
2370 | emit_move_insn (hard_frame_pointer_rtx, | |
2371 | gen_rtx_MEM (DImode, | |
2372 | plus_constant (stack_pointer_rtx, | |
2373 | offset))); | |
2374 | offset += 8; | |
2375 | } | |
2376 | ||
2377 | /* We do not need to restore pretended incoming args, just add back | |
2378 | offset to sp. */ | |
2379 | if (stack_space_to_deallocate != 0) | |
2380 | mmix_emit_sp_add (stack_space_to_deallocate); | |
2381 | ||
2382 | if (current_function_calls_eh_return) | |
2383 | /* Adjust the (normal) stack-pointer to that of the receiver. | |
2384 | FIXME: It would be nice if we could also adjust the register stack | |
2385 | here, but we need to express it through DWARF 2 too. */ | |
2386 | emit_insn (gen_adddi3 (stack_pointer_rtx, stack_pointer_rtx, | |
2387 | gen_rtx_REG (DImode, | |
2388 | MMIX_EH_RETURN_STACKADJ_REGNUM))); | |
2389 | } | |
2390 | ||
68cbb7e3 | 2391 | /* Output an optimal sequence for setting a register to a specific |
2392 | constant. Used in an alternative for const_ints in movdi, and when | |
2393 | using large stack-frame offsets. | |
2394 | ||
2395 | Use do_begin_end to say if a line-starting TAB and newline before the | |
2396 | first insn and after the last insn is wanted. */ | |
2397 | ||
2398 | void | |
2399 | mmix_output_register_setting (stream, regno, value, do_begin_end) | |
2400 | FILE *stream; | |
2401 | int regno; | |
2402 | HOST_WIDEST_INT value; | |
2403 | int do_begin_end; | |
2404 | { | |
2405 | if (do_begin_end) | |
2406 | fprintf (stream, "\t"); | |
2407 | ||
2408 | if (mmix_shiftable_wyde_value ((unsigned HOST_WIDEST_INT) value)) | |
2409 | { | |
2410 | /* First, the one-insn cases. */ | |
2411 | mmix_output_shiftvalue_op_from_str (stream, "SET", | |
2412 | (unsigned HOST_WIDEST_INT) | |
2413 | value); | |
2414 | fprintf (stream, " %s,", reg_names[regno]); | |
2415 | mmix_output_shifted_value (stream, (unsigned HOST_WIDEST_INT) value); | |
2416 | } | |
2417 | else if (mmix_shiftable_wyde_value (-(unsigned HOST_WIDEST_INT) value)) | |
2418 | { | |
2419 | /* We do this to get a bit more legible assembly code. The next | |
2420 | alternative is mostly redundant with this. */ | |
2421 | ||
2422 | mmix_output_shiftvalue_op_from_str (stream, "SET", | |
2423 | -(unsigned HOST_WIDEST_INT) | |
2424 | value); | |
2425 | fprintf (stream, " %s,", reg_names[regno]); | |
2426 | mmix_output_shifted_value (stream, -(unsigned HOST_WIDEST_INT) value); | |
2427 | fprintf (stream, "\n\tNEGU %s,0,%s", reg_names[regno], | |
2428 | reg_names[regno]); | |
2429 | } | |
2430 | else if (mmix_shiftable_wyde_value (~(unsigned HOST_WIDEST_INT) value)) | |
2431 | { | |
2432 | /* Slightly more expensive, the two-insn cases. */ | |
2433 | ||
2434 | /* FIXME: We could of course also test if 0..255-N or ~(N | 1..255) | |
2435 | is shiftable, or any other one-insn transformation of the value. | |
2436 | FIXME: Check first if the value is "shiftable" by two loading | |
2437 | with two insns, since it makes more readable assembly code (if | |
2438 | anyone else cares). */ | |
2439 | ||
2440 | mmix_output_shiftvalue_op_from_str (stream, "SET", | |
2441 | ~(unsigned HOST_WIDEST_INT) | |
2442 | value); | |
2443 | fprintf (stream, " %s,", reg_names[regno]); | |
2444 | mmix_output_shifted_value (stream, ~(unsigned HOST_WIDEST_INT) value); | |
2445 | fprintf (stream, "\n\tNOR %s,%s,0", reg_names[regno], | |
2446 | reg_names[regno]); | |
2447 | } | |
2448 | else | |
2449 | { | |
2450 | /* The generic case. 2..4 insns. */ | |
25037517 | 2451 | static const char *const higher_parts[] = {"L", "ML", "MH", "H"}; |
68cbb7e3 | 2452 | const char *op = "SET"; |
2453 | const char *line_begin = ""; | |
f0b228a5 | 2454 | int insns = 0; |
68cbb7e3 | 2455 | int i; |
f0b228a5 | 2456 | HOST_WIDEST_INT tmpvalue = value; |
68cbb7e3 | 2457 | |
f0b228a5 | 2458 | /* Compute the number of insns needed to output this constant. */ |
2459 | for (i = 0; i < 4 && tmpvalue != 0; i++) | |
2460 | { | |
2461 | if (tmpvalue & 65535) | |
2462 | insns++; | |
2463 | tmpvalue >>= 16; | |
2464 | } | |
2465 | if (TARGET_BASE_ADDRESSES && insns == 3) | |
2466 | { | |
2467 | /* The number three is based on a static observation on | |
2468 | ghostscript-6.52. Two and four are excluded because there | |
2469 | are too many such constants, and each unique constant (maybe | |
2470 | offset by 1..255) were used few times compared to other uses, | |
2471 | e.g. addresses. | |
2472 | ||
2473 | We use base-plus-offset addressing to force it into a global | |
2474 | register; we just use a "LDA reg,VALUE", which will cause the | |
2475 | assembler and linker to DTRT (for constants as well as | |
2476 | addresses). */ | |
2477 | fprintf (stream, "LDA %s,", reg_names[regno]); | |
2478 | mmix_output_octa (stream, value, 0); | |
2479 | } | |
2480 | else | |
68cbb7e3 | 2481 | { |
f0b228a5 | 2482 | /* Output pertinent parts of the 4-wyde sequence. |
2483 | Still more to do if we want this to be optimal, but hey... | |
2484 | Note that the zero case has been handled above. */ | |
2485 | for (i = 0; i < 4 && value != 0; i++) | |
68cbb7e3 | 2486 | { |
f0b228a5 | 2487 | if (value & 65535) |
2488 | { | |
2489 | fprintf (stream, "%s%s%s %s,#%x", line_begin, op, | |
2490 | higher_parts[i], reg_names[regno], | |
2491 | (int) (value & 65535)); | |
2492 | /* The first one sets the rest of the bits to 0, the next | |
2493 | ones add set bits. */ | |
2494 | op = "INC"; | |
2495 | line_begin = "\n\t"; | |
2496 | } | |
68cbb7e3 | 2497 | |
f0b228a5 | 2498 | value >>= 16; |
2499 | } | |
68cbb7e3 | 2500 | } |
2501 | } | |
2502 | ||
2503 | if (do_begin_end) | |
2504 | fprintf (stream, "\n"); | |
2505 | } | |
2506 | ||
2507 | /* Return 1 if value is 0..65535*2**(16*N) for N=0..3. | |
2508 | else return 0. */ | |
2509 | ||
2510 | int | |
2511 | mmix_shiftable_wyde_value (value) | |
2512 | unsigned HOST_WIDEST_INT value; | |
2513 | { | |
2514 | /* Shift by 16 bits per group, stop when we've found two groups with | |
2515 | nonzero bits. */ | |
2516 | int i; | |
2517 | int has_candidate = 0; | |
2518 | ||
2519 | for (i = 0; i < 4; i++) | |
2520 | { | |
2521 | if (value & 65535) | |
2522 | { | |
2523 | if (has_candidate) | |
2524 | return 0; | |
2525 | else | |
2526 | has_candidate = 1; | |
2527 | } | |
2528 | ||
2529 | value >>= 16; | |
2530 | } | |
2531 | ||
2532 | return 1; | |
2533 | } | |
2534 | ||
2535 | /* True if this is an address_operand or a symbolic operand. */ | |
2536 | ||
2537 | int | |
2538 | mmix_symbolic_or_address_operand (op, mode) | |
2539 | rtx op; | |
2540 | enum machine_mode mode; | |
2541 | { | |
2542 | switch (GET_CODE (op)) | |
2543 | { | |
2544 | case SYMBOL_REF: | |
2545 | case LABEL_REF: | |
2546 | return 1; | |
2547 | case CONST: | |
2548 | op = XEXP (op, 0); | |
2549 | if ((GET_CODE (XEXP (op, 0)) == SYMBOL_REF | |
2550 | || GET_CODE (XEXP (op, 0)) == LABEL_REF) | |
2551 | && (GET_CODE (XEXP (op, 1)) == CONST_INT | |
2552 | || (GET_CODE (XEXP (op, 1)) == CONST_DOUBLE | |
2553 | && GET_MODE (XEXP (op, 1)) == VOIDmode))) | |
2554 | return 1; | |
2555 | /* FALLTHROUGH */ | |
2556 | default: | |
2557 | return address_operand (op, mode); | |
2558 | } | |
2559 | } | |
2560 | ||
2561 | /* True if this is a register or CONST_INT (or CONST_DOUBLE for DImode). | |
2562 | We could narrow the value down with a couple of predicated, but that | |
2563 | doesn't seem to be worth it at the moment. */ | |
2564 | ||
2565 | int | |
2566 | mmix_reg_or_constant_operand (op, mode) | |
2567 | rtx op; | |
2568 | enum machine_mode mode; | |
2569 | { | |
2570 | return register_operand (op, mode) | |
2571 | || (GET_CODE (op) == CONST_DOUBLE && GET_MODE (op) == VOIDmode) | |
2572 | || GET_CODE (op) == CONST_INT; | |
2573 | } | |
2574 | ||
2575 | /* True if this is a register with a condition-code mode. */ | |
2576 | ||
2577 | int | |
2578 | mmix_reg_cc_operand (op, mode) | |
2579 | rtx op; | |
2580 | enum machine_mode mode; | |
2581 | { | |
2582 | if (mode == VOIDmode) | |
2583 | mode = GET_MODE (op); | |
2584 | ||
2585 | return register_operand (op, mode) | |
2586 | && (mode == CCmode || mode == CC_UNSmode || mode == CC_FPmode | |
2587 | || mode == CC_FPEQmode || mode == CC_FUNmode); | |
2588 | } | |
2589 | ||
2590 | /* True if this is a foldable comparison operator | |
2591 | - one where a the result of (compare:CC (reg) (const_int 0)) can be | |
2592 | replaced by (reg). */ | |
2593 | ||
2594 | int | |
2595 | mmix_foldable_comparison_operator (op, mode) | |
2596 | rtx op; | |
2597 | enum machine_mode mode; | |
2598 | { | |
2599 | RTX_CODE code = GET_CODE (op); | |
2600 | ||
2601 | if (mode == VOIDmode) | |
2602 | mode = GET_MODE (op); | |
2603 | ||
2604 | if (mode == VOIDmode && GET_RTX_CLASS (GET_CODE (op)) == '<') | |
2605 | mode = GET_MODE (XEXP (op, 0)); | |
2606 | ||
2607 | return ((mode == CCmode || mode == DImode) | |
2608 | && (code == NE || code == EQ || code == GE || code == GT | |
2609 | || code == LE)) | |
2610 | /* FIXME: This may be a stupid trick. What happens when GCC wants to | |
2611 | reverse the condition? Can it do that by itself? Maybe it can | |
2612 | even reverse the condition to fit a foldable one in the first | |
2613 | place? */ | |
2614 | || (mode == CC_UNSmode && (code == GTU || code == LEU)); | |
2615 | } | |
2616 | ||
2617 | /* Like comparison_operator, but only true if this comparison operator is | |
2618 | applied to a valid mode. Needed to avoid jump.c generating invalid | |
2619 | code with -ffast-math (gcc.dg/20001228-1.c). */ | |
2620 | ||
2621 | int | |
2622 | mmix_comparison_operator (op, mode) | |
2623 | rtx op; | |
2624 | enum machine_mode mode; | |
2625 | { | |
2626 | RTX_CODE code = GET_CODE (op); | |
2627 | ||
2628 | /* Comparison operators usually don't have a mode, but let's try and get | |
2629 | one anyway for the day that changes. */ | |
2630 | if (mode == VOIDmode) | |
2631 | mode = GET_MODE (op); | |
2632 | ||
2633 | /* Get the mode from the first operand if we don't have one. */ | |
2634 | if (mode == VOIDmode && GET_RTX_CLASS (GET_CODE (op)) == '<') | |
2635 | mode = GET_MODE (XEXP (op, 0)); | |
2636 | ||
2637 | /* FIXME: This needs to be kept in sync with the tables in | |
2638 | mmix_output_condition. */ | |
2639 | return | |
2640 | (mode == VOIDmode && GET_RTX_CLASS (GET_CODE (op)) == '<') | |
2641 | || (mode == CC_FUNmode | |
2642 | && (code == ORDERED || code == UNORDERED)) | |
2643 | || (mode == CC_FPmode | |
2644 | && (code == GT || code == LT)) | |
2645 | || (mode == CC_FPEQmode | |
2646 | && (code == NE || code == EQ)) | |
2647 | || (mode == CC_UNSmode | |
2648 | && (code == GEU || code == GTU || code == LEU || code == LTU)) | |
2649 | || (mode == CCmode | |
2650 | && (code == NE || code == EQ || code == GE || code == GT | |
2651 | || code == LE || code == LT)) | |
2652 | || (mode == DImode | |
2653 | && (code == NE || code == EQ || code == GE || code == GT | |
2654 | || code == LE || code == LT || code == LEU || code == GTU)); | |
2655 | } | |
2656 | ||
2657 | /* True if this is a register or 0 (int or float). */ | |
2658 | ||
2659 | int | |
2660 | mmix_reg_or_0_operand (op, mode) | |
2661 | rtx op; | |
2662 | enum machine_mode mode; | |
2663 | { | |
2664 | /* FIXME: Is mode calculation necessary and correct? */ | |
2665 | return | |
2666 | op == CONST0_RTX (mode == VOIDmode ? GET_MODE (op) : mode) | |
2667 | || register_operand (op, mode); | |
2668 | } | |
2669 | ||
2670 | /* True if this is a register or an int 0..255. */ | |
2671 | ||
2672 | int | |
2673 | mmix_reg_or_8bit_operand (op, mode) | |
2674 | rtx op; | |
2675 | enum machine_mode mode; | |
2676 | { | |
2677 | return register_operand (op, mode) | |
2678 | || (GET_CODE (op) == CONST_INT | |
2679 | && CONST_OK_FOR_LETTER_P (INTVAL (op), 'I')); | |
2680 | } | |
2681 | ||
68cbb7e3 | 2682 | /* Returns zero if code and mode is not a valid condition from a |
2683 | compare-type insn. Nonzero if it is. The parameter op, if non-NULL, | |
2684 | is the comparison of mode is CC-somethingmode. */ | |
2685 | ||
2686 | int | |
2687 | mmix_valid_comparison (code, mode, op) | |
2688 | RTX_CODE code; | |
2689 | enum machine_mode mode; | |
2690 | rtx op; | |
2691 | { | |
2692 | if (mode == VOIDmode && op != NULL_RTX) | |
2693 | mode = GET_MODE (op); | |
2694 | ||
2695 | /* We don't care to look at these, they should always be valid. */ | |
2696 | if (mode == CCmode || mode == CC_UNSmode || mode == DImode) | |
2697 | return 1; | |
2698 | ||
2699 | if ((mode == CC_FPmode || mode == DFmode) | |
2700 | && (code == GT || code == LT)) | |
2701 | return 1; | |
2702 | ||
2703 | if ((mode == CC_FPEQmode || mode == DFmode) | |
2704 | && (code == EQ || code == NE)) | |
2705 | return 1; | |
2706 | ||
2707 | if ((mode == CC_FUNmode || mode == DFmode) | |
2708 | && (code == ORDERED || code == UNORDERED)) | |
2709 | return 1; | |
2710 | ||
2711 | return 0; | |
2712 | } | |
2713 | ||
2714 | /* X and Y are two things to compare using CODE. Emit a compare insn if | |
2715 | possible and return the rtx for the cc-reg in the proper mode, or | |
2716 | NULL_RTX if this is not a valid comparison. */ | |
2717 | ||
2718 | rtx | |
2719 | mmix_gen_compare_reg (code, x, y) | |
2720 | RTX_CODE code; | |
2721 | rtx x, y; | |
2722 | { | |
2723 | enum machine_mode ccmode = SELECT_CC_MODE (code, x, y); | |
2724 | rtx cc_reg; | |
2725 | ||
2726 | /* FIXME: Do we get constants here? Of double mode? */ | |
2727 | enum machine_mode mode | |
2728 | = GET_MODE (x) == VOIDmode | |
2729 | ? GET_MODE (y) | |
2730 | : GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT ? DFmode : DImode; | |
2731 | ||
2732 | if (! mmix_valid_comparison (code, mode, x)) | |
2733 | return NULL_RTX; | |
2734 | ||
2735 | cc_reg = gen_reg_rtx (ccmode); | |
2736 | ||
2737 | /* FIXME: Can we avoid emitting a compare insn here? */ | |
2738 | if (! REG_P (x) && ! REG_P (y)) | |
2739 | x = force_reg (mode, x); | |
2740 | ||
68cbb7e3 | 2741 | /* If it's not quite right yet, put y in a register. */ |
2742 | if (! REG_P (y) | |
2743 | && (GET_CODE (y) != CONST_INT | |
2744 | || ! CONST_OK_FOR_LETTER_P (INTVAL (y), 'I'))) | |
2745 | y = force_reg (mode, y); | |
2746 | ||
2747 | emit_insn (gen_rtx_SET (VOIDmode, cc_reg, | |
2748 | gen_rtx_COMPARE (ccmode, x, y))); | |
2749 | ||
2750 | return cc_reg; | |
2751 | } | |
2752 | ||
2753 | /* Local (static) helper functions. */ | |
2754 | ||
d3310704 | 2755 | static void |
2756 | mmix_emit_sp_add (offset) | |
2757 | HOST_WIDE_INT offset; | |
2758 | { | |
2759 | rtx insn; | |
2760 | ||
2761 | if (offset < 0) | |
2762 | { | |
2763 | /* Negative stack-pointer adjustments are allocations and appear in | |
2764 | the prologue only. We mark them as frame-related so unwind and | |
2765 | debug info is properly emitted for them. */ | |
2766 | if (offset > -255) | |
2767 | insn = emit_insn (gen_adddi3 (stack_pointer_rtx, | |
2768 | stack_pointer_rtx, | |
2769 | GEN_INT (offset))); | |
2770 | else | |
2771 | { | |
2772 | rtx tmpr = gen_rtx_REG (DImode, 255); | |
2773 | RTX_FRAME_RELATED_P (emit_move_insn (tmpr, GEN_INT (offset))) = 1; | |
2774 | insn = emit_insn (gen_adddi3 (stack_pointer_rtx, | |
2775 | stack_pointer_rtx, tmpr)); | |
2776 | } | |
2777 | RTX_FRAME_RELATED_P (insn) = 1; | |
2778 | } | |
2779 | else | |
2780 | { | |
2781 | /* Positive adjustments are in the epilogue only. Don't mark them | |
2782 | as "frame-related" for unwind info. */ | |
2783 | if (CONST_OK_FOR_LETTER_P (offset, 'L')) | |
2784 | emit_insn (gen_adddi3 (stack_pointer_rtx, | |
2785 | stack_pointer_rtx, | |
2786 | GEN_INT (offset))); | |
2787 | else | |
2788 | { | |
2789 | rtx tmpr = gen_rtx_REG (DImode, 255); | |
2790 | emit_move_insn (tmpr, GEN_INT (offset)); | |
2791 | insn = emit_insn (gen_adddi3 (stack_pointer_rtx, | |
2792 | stack_pointer_rtx, tmpr)); | |
2793 | } | |
2794 | } | |
2795 | } | |
2796 | ||
68cbb7e3 | 2797 | /* Print operator suitable for doing something with a shiftable |
ebb11c7b | 2798 | wyde. The type of operator is passed as an asm output modifier. */ |
68cbb7e3 | 2799 | |
2800 | static void | |
2801 | mmix_output_shiftvalue_op_from_str (stream, mainop, value) | |
2802 | FILE *stream; | |
2803 | const char *mainop; | |
2804 | HOST_WIDEST_INT value; | |
2805 | { | |
25037517 | 2806 | static const char *const op_part[] = {"L", "ML", "MH", "H"}; |
68cbb7e3 | 2807 | int i; |
2808 | ||
2809 | if (! mmix_shiftable_wyde_value (value)) | |
2810 | { | |
2811 | char s[sizeof ("0xffffffffffffffff")]; | |
2812 | sprintf (s, HOST_WIDEST_INT_PRINT_HEX, value); | |
2813 | internal_error ("MMIX Internal: %s is not a shiftable int", s); | |
2814 | } | |
2815 | ||
2816 | for (i = 0; i < 4; i++) | |
2817 | { | |
2818 | /* We know we're through when we find one-bits in the low | |
2819 | 16 bits. */ | |
2820 | if (value & 0xffff) | |
2821 | { | |
2822 | fprintf (stream, "%s%s", mainop, op_part[i]); | |
2823 | return; | |
2824 | } | |
2825 | value >>= 16; | |
2826 | } | |
2827 | ||
2828 | /* No bits set? Then it must have been zero. */ | |
2829 | fprintf (stream, "%sL", mainop); | |
2830 | } | |
2831 | ||
2832 | /* Print a 64-bit value, optionally prefixed by assembly pseudo. */ | |
2833 | ||
2834 | static void | |
2835 | mmix_output_octa (stream, value, do_begin_end) | |
2836 | FILE *stream; | |
2837 | HOST_WIDEST_INT value; | |
2838 | int do_begin_end; | |
2839 | { | |
2840 | /* Snipped from final.c:output_addr_const. We need to avoid the | |
2841 | presumed universal "0x" prefix. We can do it by replacing "0x" with | |
2842 | "#0" here; we must avoid a space in the operands and no, the zero | |
2843 | won't cause the number to be assumed in octal format. */ | |
2844 | char hex_format[sizeof (HOST_WIDEST_INT_PRINT_HEX)]; | |
2845 | ||
2846 | if (do_begin_end) | |
2847 | fprintf (stream, "\tOCTA "); | |
2848 | ||
2849 | strcpy (hex_format, HOST_WIDEST_INT_PRINT_HEX); | |
2850 | hex_format[0] = '#'; | |
2851 | hex_format[1] = '0'; | |
2852 | ||
2853 | /* Provide a few alternative output formats depending on the number, to | |
2854 | improve legibility of assembler output. */ | |
2855 | if ((value < (HOST_WIDEST_INT) 0 && value > (HOST_WIDEST_INT) -10000) | |
2856 | || (value >= (HOST_WIDEST_INT) 0 && value <= (HOST_WIDEST_INT) 16384)) | |
2857 | fprintf (stream, "%d", (int) value); | |
2858 | else if (value > (HOST_WIDEST_INT) 0 | |
2859 | && value < ((HOST_WIDEST_INT) 1 << 31) * 2) | |
2860 | fprintf (stream, "#%x", (unsigned int) value); | |
2861 | else | |
2862 | fprintf (stream, hex_format, value); | |
2863 | ||
2864 | if (do_begin_end) | |
2865 | fprintf (stream, "\n"); | |
2866 | } | |
2867 | ||
2868 | /* Print the presumed shiftable wyde argument shifted into place (to | |
2869 | be output with an operand). */ | |
2870 | ||
2871 | static void | |
2872 | mmix_output_shifted_value (stream, value) | |
2873 | FILE * stream; | |
2874 | HOST_WIDEST_INT value; | |
2875 | { | |
2876 | int i; | |
2877 | ||
2878 | if (! mmix_shiftable_wyde_value (value)) | |
2879 | { | |
2880 | char s[16+2+1]; | |
2881 | sprintf (s, HOST_WIDEST_INT_PRINT_HEX, value); | |
2882 | internal_error ("MMIX Internal: %s is not a shiftable int", s); | |
2883 | } | |
2884 | ||
2885 | for (i = 0; i < 4; i++) | |
2886 | { | |
2887 | /* We know we're through when we find one-bits in the low 16 bits. */ | |
2888 | if (value & 0xffff) | |
2889 | { | |
2890 | fprintf (stream, "#%x", (int) (value & 0xffff)); | |
2891 | return; | |
2892 | } | |
2893 | ||
2894 | value >>= 16; | |
2895 | } | |
2896 | ||
2897 | /* No bits set? Then it must have been zero. */ | |
2898 | fprintf (stream, "0"); | |
2899 | } | |
2900 | ||
2901 | /* Output an MMIX condition name corresponding to an operator | |
2902 | and operands: | |
2903 | (comparison_operator [(comparison_operator ...) (const_int 0)]) | |
2904 | which means we have to look at *two* operators. | |
2905 | ||
2906 | The argument "reversed" refers to reversal of the condition (not the | |
2907 | same as swapping the arguments). */ | |
2908 | ||
2909 | static void | |
2910 | mmix_output_condition (stream, x, reversed) | |
2911 | FILE *stream; | |
2912 | rtx x; | |
2913 | int reversed; | |
2914 | { | |
2915 | struct cc_conv | |
2916 | { | |
2917 | RTX_CODE cc; | |
2918 | ||
2919 | /* The normal output cc-code. */ | |
2920 | const char *const normal; | |
2921 | ||
2922 | /* The reversed cc-code, or NULL if invalid. */ | |
2923 | const char *const reversed; | |
2924 | }; | |
2925 | ||
2926 | struct cc_type_conv | |
2927 | { | |
2928 | enum machine_mode cc_mode; | |
2929 | ||
2930 | /* Terminated with {NIL, NULL, NULL} */ | |
2931 | const struct cc_conv *const convs; | |
2932 | }; | |
2933 | ||
2934 | #undef CCEND | |
2935 | #define CCEND {NIL, NULL, NULL} | |
2936 | ||
2937 | static const struct cc_conv cc_fun_convs[] | |
2938 | = {{ORDERED, "Z", "P"}, | |
2939 | {UNORDERED, "P", "Z"}, | |
2940 | CCEND}; | |
2941 | static const struct cc_conv cc_fp_convs[] | |
2942 | = {{GT, "P", NULL}, | |
2943 | {LT, "N", NULL}, | |
2944 | CCEND}; | |
2945 | static const struct cc_conv cc_fpeq_convs[] | |
2946 | = {{NE, "Z", "P"}, | |
2947 | {EQ, "P", "Z"}, | |
2948 | CCEND}; | |
2949 | static const struct cc_conv cc_uns_convs[] | |
2950 | = {{GEU, "NN", "N"}, | |
2951 | {GTU, "P", "NP"}, | |
2952 | {LEU, "NP", "P"}, | |
2953 | {LTU, "N", "NN"}, | |
2954 | CCEND}; | |
2955 | static const struct cc_conv cc_signed_convs[] | |
2956 | = {{NE, "NZ", "Z"}, | |
2957 | {EQ, "Z", "NZ"}, | |
2958 | {GE, "NN", "N"}, | |
2959 | {GT, "P", "NP"}, | |
2960 | {LE, "NP", "P"}, | |
2961 | {LT, "N", "NN"}, | |
2962 | CCEND}; | |
2963 | static const struct cc_conv cc_di_convs[] | |
2964 | = {{NE, "NZ", "Z"}, | |
2965 | {EQ, "Z", "NZ"}, | |
2966 | {GE, "NN", "N"}, | |
2967 | {GT, "P", "NP"}, | |
2968 | {LE, "NP", "P"}, | |
2969 | {LT, "N", "NN"}, | |
2970 | {GTU, "NZ", "Z"}, | |
2971 | {LEU, "Z", "NZ"}, | |
2972 | CCEND}; | |
2973 | #undef CCEND | |
2974 | ||
2975 | static const struct cc_type_conv cc_convs[] | |
2976 | = {{CC_FUNmode, cc_fun_convs}, | |
2977 | {CC_FPmode, cc_fp_convs}, | |
2978 | {CC_FPEQmode, cc_fpeq_convs}, | |
2979 | {CC_UNSmode, cc_uns_convs}, | |
2980 | {CCmode, cc_signed_convs}, | |
2981 | {DImode, cc_di_convs}}; | |
2982 | ||
3585dac7 | 2983 | size_t i; |
68cbb7e3 | 2984 | int j; |
2985 | ||
2986 | enum machine_mode mode = GET_MODE (XEXP (x, 0)); | |
2987 | RTX_CODE cc = GET_CODE (x); | |
2988 | ||
3585dac7 | 2989 | for (i = 0; i < ARRAY_SIZE (cc_convs); i++) |
68cbb7e3 | 2990 | { |
2991 | if (mode == cc_convs[i].cc_mode) | |
2992 | { | |
2993 | for (j = 0; cc_convs[i].convs[j].cc != NIL; j++) | |
2994 | if (cc == cc_convs[i].convs[j].cc) | |
2995 | { | |
2996 | const char *mmix_cc | |
2997 | = (reversed ? cc_convs[i].convs[j].reversed | |
2998 | : cc_convs[i].convs[j].normal); | |
2999 | ||
3000 | if (mmix_cc == NULL) | |
3001 | fatal_insn ("MMIX Internal: Trying to output invalidly\ | |
3002 | reversed condition:", x); | |
3003 | ||
3004 | fprintf (stream, "%s", mmix_cc); | |
3005 | return; | |
3006 | } | |
3007 | ||
3008 | fatal_insn ("MMIX Internal: What's the CC of this?", x); | |
3009 | } | |
3010 | } | |
3011 | ||
3012 | fatal_insn ("MMIX Internal: What is the CC of this?", x); | |
3013 | } | |
3014 | ||
3015 | /* Return the bit-value for a const_int or const_double. */ | |
3016 | ||
3017 | static HOST_WIDEST_INT | |
3018 | mmix_intval (x) | |
3019 | rtx x; | |
3020 | { | |
3021 | unsigned HOST_WIDEST_INT retval; | |
3022 | ||
3023 | if (GET_CODE (x) == CONST_INT) | |
3024 | return INTVAL (x); | |
3025 | ||
3026 | /* We make a little song and dance because converting to long long in | |
3027 | gcc-2.7.2 is broken. I still want people to be able to use it for | |
3028 | cross-compilation to MMIX. */ | |
3029 | if (GET_CODE (x) == CONST_DOUBLE && GET_MODE (x) == VOIDmode) | |
3030 | { | |
3031 | if (sizeof (HOST_WIDE_INT) < sizeof (HOST_WIDEST_INT)) | |
3032 | { | |
3033 | retval = (unsigned) CONST_DOUBLE_LOW (x) / 2; | |
3034 | retval *= 2; | |
3035 | retval |= CONST_DOUBLE_LOW (x) & 1; | |
3036 | ||
3037 | retval |= | |
3038 | (unsigned HOST_WIDEST_INT) CONST_DOUBLE_HIGH (x) | |
3039 | << (HOST_BITS_PER_LONG); | |
3040 | } | |
3041 | else | |
3042 | retval = CONST_DOUBLE_HIGH (x); | |
3043 | ||
3044 | return retval; | |
3045 | } | |
3046 | ||
3047 | if (GET_CODE (x) == CONST_DOUBLE) | |
3048 | { | |
3049 | REAL_VALUE_TYPE value; | |
3050 | ||
3051 | /* FIXME: This macro is not in the manual but should be. */ | |
3052 | REAL_VALUE_FROM_CONST_DOUBLE (value, x); | |
3053 | ||
3054 | if (GET_MODE (x) == DFmode) | |
3055 | { | |
3056 | long bits[2]; | |
dc8dc4ce | 3057 | |
68cbb7e3 | 3058 | REAL_VALUE_TO_TARGET_DOUBLE (value, bits); |
3059 | ||
3060 | if (sizeof (long) < sizeof (HOST_WIDEST_INT)) | |
3061 | { | |
3062 | retval = (unsigned long) bits[1] / 2; | |
3063 | retval *= 2; | |
3064 | retval |= (unsigned long) bits[1] & 1; | |
3065 | retval | |
3066 | |= (unsigned HOST_WIDEST_INT) bits[0] | |
3067 | << (sizeof (bits[0]) * 8); | |
3068 | } | |
3069 | else | |
3070 | retval = (unsigned long) bits[1]; | |
3071 | ||
3072 | return retval; | |
3073 | } | |
3074 | else if (GET_MODE (x) == SFmode) | |
3075 | { | |
3076 | long bits; | |
3077 | REAL_VALUE_TO_TARGET_SINGLE (value, bits); | |
3078 | ||
3079 | return (unsigned long) bits; | |
3080 | } | |
3081 | } | |
3082 | ||
3083 | fatal_insn ("MMIX Internal: This is not a constant:", x); | |
3084 | } | |
3085 | ||
3086 | /* | |
3087 | * Local variables: | |
3088 | * eval: (c-set-style "gnu") | |
3089 | * indent-tabs-mode: t | |
3090 | * End: | |
3091 | */ |