Mercurial > hg > CbC > CbC_gcc
comparison gcc/config/mmix/mmix.c @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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children | 77e2b8dfacca |
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1 /* Definitions of target machine for GNU compiler, for MMIX. | |
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 | |
3 Free Software Foundation, Inc. | |
4 Contributed by Hans-Peter Nilsson (hp@bitrange.com) | |
5 | |
6 This file is part of GCC. | |
7 | |
8 GCC is free software; you can redistribute it and/or modify | |
9 it under the terms of the GNU General Public License as published by | |
10 the Free Software Foundation; either version 3, or (at your option) | |
11 any later version. | |
12 | |
13 GCC is distributed in the hope that it will be useful, | |
14 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 GNU General Public License for more details. | |
17 | |
18 You should have received a copy of the GNU General Public License | |
19 along with GCC; see the file COPYING3. If not see | |
20 <http://www.gnu.org/licenses/>. */ | |
21 | |
22 #include "config.h" | |
23 #include "system.h" | |
24 #include "coretypes.h" | |
25 #include "tm.h" | |
26 #include "rtl.h" | |
27 #include "regs.h" | |
28 #include "hard-reg-set.h" | |
29 #include "hashtab.h" | |
30 #include "insn-config.h" | |
31 #include "output.h" | |
32 #include "flags.h" | |
33 #include "tree.h" | |
34 #include "function.h" | |
35 #include "expr.h" | |
36 #include "toplev.h" | |
37 #include "recog.h" | |
38 #include "ggc.h" | |
39 #include "dwarf2.h" | |
40 #include "debug.h" | |
41 #include "tm_p.h" | |
42 #include "integrate.h" | |
43 #include "target.h" | |
44 #include "target-def.h" | |
45 #include "real.h" | |
46 | |
47 /* First some local helper definitions. */ | |
48 #define MMIX_FIRST_GLOBAL_REGNUM 32 | |
49 | |
50 /* We'd need a current_function_has_landing_pad. It's marked as such when | |
51 a nonlocal_goto_receiver is expanded. Not just a C++ thing, but | |
52 mostly. */ | |
53 #define MMIX_CFUN_HAS_LANDING_PAD (cfun->machine->has_landing_pad != 0) | |
54 | |
55 /* We have no means to tell DWARF 2 about the register stack, so we need | |
56 to store the return address on the stack if an exception can get into | |
57 this function. FIXME: Narrow condition. Before any whole-function | |
58 analysis, df_regs_ever_live_p () isn't initialized. We know it's up-to-date | |
59 after reload_completed; it may contain incorrect information some time | |
60 before that. Within a RTL sequence (after a call to start_sequence, | |
61 such as in RTL expanders), leaf_function_p doesn't see all insns | |
62 (perhaps any insn). But regs_ever_live is up-to-date when | |
63 leaf_function_p () isn't, so we "or" them together to get accurate | |
64 information. FIXME: Some tweak to leaf_function_p might be | |
65 preferable. */ | |
66 #define MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS \ | |
67 (flag_exceptions \ | |
68 && ((reload_completed && df_regs_ever_live_p (MMIX_rJ_REGNUM)) \ | |
69 || !leaf_function_p ())) | |
70 | |
71 #define IS_MMIX_EH_RETURN_DATA_REG(REGNO) \ | |
72 (crtl->calls_eh_return \ | |
73 && (EH_RETURN_DATA_REGNO (0) == REGNO \ | |
74 || EH_RETURN_DATA_REGNO (1) == REGNO \ | |
75 || EH_RETURN_DATA_REGNO (2) == REGNO \ | |
76 || EH_RETURN_DATA_REGNO (3) == REGNO)) | |
77 | |
78 /* For the default ABI, we rename registers at output-time to fill the gap | |
79 between the (statically partitioned) saved registers and call-clobbered | |
80 registers. In effect this makes unused call-saved registers to be used | |
81 as call-clobbered registers. The benefit comes from keeping the number | |
82 of local registers (value of rL) low, since there's a cost of | |
83 increasing rL and clearing unused (unset) registers with lower numbers. | |
84 Don't translate while outputting the prologue. */ | |
85 #define MMIX_OUTPUT_REGNO(N) \ | |
86 (TARGET_ABI_GNU \ | |
87 || (int) (N) < MMIX_RETURN_VALUE_REGNUM \ | |
88 || (int) (N) > MMIX_LAST_STACK_REGISTER_REGNUM \ | |
89 || cfun == NULL \ | |
90 || cfun->machine == NULL \ | |
91 || cfun->machine->in_prologue \ | |
92 ? (N) : ((N) - MMIX_RETURN_VALUE_REGNUM \ | |
93 + cfun->machine->highest_saved_stack_register + 1)) | |
94 | |
95 /* The %d in "POP %d,0". */ | |
96 #define MMIX_POP_ARGUMENT() \ | |
97 ((! TARGET_ABI_GNU \ | |
98 && crtl->return_rtx != NULL \ | |
99 && ! cfun->returns_struct) \ | |
100 ? (GET_CODE (crtl->return_rtx) == PARALLEL \ | |
101 ? GET_NUM_ELEM (XVEC (crtl->return_rtx, 0)) : 1) \ | |
102 : 0) | |
103 | |
104 /* The canonical saved comparison operands for non-cc0 machines, set in | |
105 the compare expander. */ | |
106 rtx mmix_compare_op0; | |
107 rtx mmix_compare_op1; | |
108 | |
109 /* Declarations of locals. */ | |
110 | |
111 /* Intermediate for insn output. */ | |
112 static int mmix_output_destination_register; | |
113 | |
114 static void mmix_output_shiftvalue_op_from_str | |
115 (FILE *, const char *, HOST_WIDEST_INT); | |
116 static void mmix_output_shifted_value (FILE *, HOST_WIDEST_INT); | |
117 static void mmix_output_condition (FILE *, rtx, int); | |
118 static HOST_WIDEST_INT mmix_intval (rtx); | |
119 static void mmix_output_octa (FILE *, HOST_WIDEST_INT, int); | |
120 static bool mmix_assemble_integer (rtx, unsigned int, int); | |
121 static struct machine_function *mmix_init_machine_status (void); | |
122 static void mmix_encode_section_info (tree, rtx, int); | |
123 static const char *mmix_strip_name_encoding (const char *); | |
124 static void mmix_emit_sp_add (HOST_WIDE_INT offset); | |
125 static void mmix_target_asm_function_prologue (FILE *, HOST_WIDE_INT); | |
126 static void mmix_target_asm_function_end_prologue (FILE *); | |
127 static void mmix_target_asm_function_epilogue (FILE *, HOST_WIDE_INT); | |
128 static void mmix_reorg (void); | |
129 static void mmix_asm_output_mi_thunk | |
130 (FILE *, tree, HOST_WIDE_INT, HOST_WIDE_INT, tree); | |
131 static void mmix_setup_incoming_varargs | |
132 (CUMULATIVE_ARGS *, enum machine_mode, tree, int *, int); | |
133 static void mmix_file_start (void); | |
134 static void mmix_file_end (void); | |
135 static bool mmix_rtx_costs (rtx, int, int, int *, bool); | |
136 static rtx mmix_struct_value_rtx (tree, int); | |
137 static bool mmix_pass_by_reference (CUMULATIVE_ARGS *, | |
138 enum machine_mode, const_tree, bool); | |
139 | |
140 /* Target structure macros. Listed by node. See `Using and Porting GCC' | |
141 for a general description. */ | |
142 | |
143 /* Node: Function Entry */ | |
144 | |
145 #undef TARGET_ASM_BYTE_OP | |
146 #define TARGET_ASM_BYTE_OP NULL | |
147 #undef TARGET_ASM_ALIGNED_HI_OP | |
148 #define TARGET_ASM_ALIGNED_HI_OP NULL | |
149 #undef TARGET_ASM_ALIGNED_SI_OP | |
150 #define TARGET_ASM_ALIGNED_SI_OP NULL | |
151 #undef TARGET_ASM_ALIGNED_DI_OP | |
152 #define TARGET_ASM_ALIGNED_DI_OP NULL | |
153 #undef TARGET_ASM_INTEGER | |
154 #define TARGET_ASM_INTEGER mmix_assemble_integer | |
155 | |
156 #undef TARGET_ASM_FUNCTION_PROLOGUE | |
157 #define TARGET_ASM_FUNCTION_PROLOGUE mmix_target_asm_function_prologue | |
158 | |
159 #undef TARGET_ASM_FUNCTION_END_PROLOGUE | |
160 #define TARGET_ASM_FUNCTION_END_PROLOGUE mmix_target_asm_function_end_prologue | |
161 | |
162 #undef TARGET_ASM_FUNCTION_EPILOGUE | |
163 #define TARGET_ASM_FUNCTION_EPILOGUE mmix_target_asm_function_epilogue | |
164 | |
165 #undef TARGET_ENCODE_SECTION_INFO | |
166 #define TARGET_ENCODE_SECTION_INFO mmix_encode_section_info | |
167 #undef TARGET_STRIP_NAME_ENCODING | |
168 #define TARGET_STRIP_NAME_ENCODING mmix_strip_name_encoding | |
169 | |
170 #undef TARGET_ASM_OUTPUT_MI_THUNK | |
171 #define TARGET_ASM_OUTPUT_MI_THUNK mmix_asm_output_mi_thunk | |
172 #undef TARGET_ASM_CAN_OUTPUT_MI_THUNK | |
173 #define TARGET_ASM_CAN_OUTPUT_MI_THUNK default_can_output_mi_thunk_no_vcall | |
174 #undef TARGET_ASM_FILE_START | |
175 #define TARGET_ASM_FILE_START mmix_file_start | |
176 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE | |
177 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true | |
178 #undef TARGET_ASM_FILE_END | |
179 #define TARGET_ASM_FILE_END mmix_file_end | |
180 | |
181 #undef TARGET_RTX_COSTS | |
182 #define TARGET_RTX_COSTS mmix_rtx_costs | |
183 #undef TARGET_ADDRESS_COST | |
184 #define TARGET_ADDRESS_COST hook_int_rtx_bool_0 | |
185 | |
186 #undef TARGET_MACHINE_DEPENDENT_REORG | |
187 #define TARGET_MACHINE_DEPENDENT_REORG mmix_reorg | |
188 | |
189 #undef TARGET_PROMOTE_FUNCTION_ARGS | |
190 #define TARGET_PROMOTE_FUNCTION_ARGS hook_bool_const_tree_true | |
191 #if 0 | |
192 /* Apparently not doing TRT if int < register-size. FIXME: Perhaps | |
193 FUNCTION_VALUE and LIBCALL_VALUE needs tweaking as some ports say. */ | |
194 #undef TARGET_PROMOTE_FUNCTION_RETURN | |
195 #define TARGET_PROMOTE_FUNCTION_RETURN hook_bool_tree_true | |
196 #endif | |
197 | |
198 #undef TARGET_STRUCT_VALUE_RTX | |
199 #define TARGET_STRUCT_VALUE_RTX mmix_struct_value_rtx | |
200 #undef TARGET_SETUP_INCOMING_VARARGS | |
201 #define TARGET_SETUP_INCOMING_VARARGS mmix_setup_incoming_varargs | |
202 #undef TARGET_PASS_BY_REFERENCE | |
203 #define TARGET_PASS_BY_REFERENCE mmix_pass_by_reference | |
204 #undef TARGET_CALLEE_COPIES | |
205 #define TARGET_CALLEE_COPIES hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true | |
206 #undef TARGET_DEFAULT_TARGET_FLAGS | |
207 #define TARGET_DEFAULT_TARGET_FLAGS TARGET_DEFAULT | |
208 | |
209 struct gcc_target targetm = TARGET_INITIALIZER; | |
210 | |
211 /* Functions that are expansions for target macros. | |
212 See Target Macros in `Using and Porting GCC'. */ | |
213 | |
214 /* OVERRIDE_OPTIONS. */ | |
215 | |
216 void | |
217 mmix_override_options (void) | |
218 { | |
219 /* Should we err or should we warn? Hmm. At least we must neutralize | |
220 it. For example the wrong kind of case-tables will be generated with | |
221 PIC; we use absolute address items for mmixal compatibility. FIXME: | |
222 They could be relative if we just elide them to after all pertinent | |
223 labels. */ | |
224 if (flag_pic) | |
225 { | |
226 warning (0, "-f%s not supported: ignored", (flag_pic > 1) ? "PIC" : "pic"); | |
227 flag_pic = 0; | |
228 } | |
229 } | |
230 | |
231 /* INIT_EXPANDERS. */ | |
232 | |
233 void | |
234 mmix_init_expanders (void) | |
235 { | |
236 init_machine_status = mmix_init_machine_status; | |
237 } | |
238 | |
239 /* Set the per-function data. */ | |
240 | |
241 static struct machine_function * | |
242 mmix_init_machine_status (void) | |
243 { | |
244 return GGC_CNEW (struct machine_function); | |
245 } | |
246 | |
247 /* DATA_ALIGNMENT. | |
248 We have trouble getting the address of stuff that is located at other | |
249 than 32-bit alignments (GETA requirements), so try to give everything | |
250 at least 32-bit alignment. */ | |
251 | |
252 int | |
253 mmix_data_alignment (tree type ATTRIBUTE_UNUSED, int basic_align) | |
254 { | |
255 if (basic_align < 32) | |
256 return 32; | |
257 | |
258 return basic_align; | |
259 } | |
260 | |
261 /* CONSTANT_ALIGNMENT. */ | |
262 | |
263 int | |
264 mmix_constant_alignment (tree constant ATTRIBUTE_UNUSED, int basic_align) | |
265 { | |
266 if (basic_align < 32) | |
267 return 32; | |
268 | |
269 return basic_align; | |
270 } | |
271 | |
272 /* LOCAL_ALIGNMENT. */ | |
273 | |
274 int | |
275 mmix_local_alignment (tree type ATTRIBUTE_UNUSED, int basic_align) | |
276 { | |
277 if (basic_align < 32) | |
278 return 32; | |
279 | |
280 return basic_align; | |
281 } | |
282 | |
283 /* CONDITIONAL_REGISTER_USAGE. */ | |
284 | |
285 void | |
286 mmix_conditional_register_usage (void) | |
287 { | |
288 int i; | |
289 | |
290 if (TARGET_ABI_GNU) | |
291 { | |
292 static const int gnu_abi_reg_alloc_order[] | |
293 = MMIX_GNU_ABI_REG_ALLOC_ORDER; | |
294 | |
295 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
296 reg_alloc_order[i] = gnu_abi_reg_alloc_order[i]; | |
297 | |
298 /* Change the default from the mmixware ABI. For the GNU ABI, | |
299 $15..$30 are call-saved just as $0..$14. There must be one | |
300 call-clobbered local register for the "hole" that holds the | |
301 number of saved local registers saved by PUSHJ/PUSHGO during the | |
302 function call, receiving the return value at return. So best is | |
303 to use the highest, $31. It's already marked call-clobbered for | |
304 the mmixware ABI. */ | |
305 for (i = 15; i <= 30; i++) | |
306 call_used_regs[i] = 0; | |
307 | |
308 /* "Unfix" the parameter registers. */ | |
309 for (i = MMIX_RESERVED_GNU_ARG_0_REGNUM; | |
310 i < MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS; | |
311 i++) | |
312 fixed_regs[i] = 0; | |
313 } | |
314 | |
315 /* Step over the ":" in special register names. */ | |
316 if (! TARGET_TOPLEVEL_SYMBOLS) | |
317 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
318 if (reg_names[i][0] == ':') | |
319 reg_names[i]++; | |
320 } | |
321 | |
322 /* INCOMING_REGNO and OUTGOING_REGNO worker function. | |
323 Those two macros must only be applied to function argument | |
324 registers. FIXME: for their current use in gcc, it'd be better | |
325 with an explicit specific additional FUNCTION_INCOMING_ARG_REGNO_P | |
326 a'la FUNCTION_ARG / FUNCTION_INCOMING_ARG instead of forcing the | |
327 target to commit to a fixed mapping and for any unspecified | |
328 register use. */ | |
329 | |
330 int | |
331 mmix_opposite_regno (int regno, int incoming) | |
332 { | |
333 if (!mmix_function_arg_regno_p (regno, incoming)) | |
334 return regno; | |
335 | |
336 return | |
337 regno - (incoming | |
338 ? MMIX_FIRST_INCOMING_ARG_REGNUM - MMIX_FIRST_ARG_REGNUM | |
339 : MMIX_FIRST_ARG_REGNUM - MMIX_FIRST_INCOMING_ARG_REGNUM); | |
340 } | |
341 | |
342 /* LOCAL_REGNO. | |
343 All registers that are part of the register stack and that will be | |
344 saved are local. */ | |
345 | |
346 int | |
347 mmix_local_regno (int regno) | |
348 { | |
349 return regno <= MMIX_LAST_STACK_REGISTER_REGNUM && !call_used_regs[regno]; | |
350 } | |
351 | |
352 /* PREFERRED_RELOAD_CLASS. | |
353 We need to extend the reload class of REMAINDER_REG and HIMULT_REG. */ | |
354 | |
355 enum reg_class | |
356 mmix_preferred_reload_class (rtx x ATTRIBUTE_UNUSED, enum reg_class rclass) | |
357 { | |
358 /* FIXME: Revisit. */ | |
359 return GET_CODE (x) == MOD && GET_MODE (x) == DImode | |
360 ? REMAINDER_REG : rclass; | |
361 } | |
362 | |
363 /* PREFERRED_OUTPUT_RELOAD_CLASS. | |
364 We need to extend the reload class of REMAINDER_REG and HIMULT_REG. */ | |
365 | |
366 enum reg_class | |
367 mmix_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED, | |
368 enum reg_class rclass) | |
369 { | |
370 /* FIXME: Revisit. */ | |
371 return GET_CODE (x) == MOD && GET_MODE (x) == DImode | |
372 ? REMAINDER_REG : rclass; | |
373 } | |
374 | |
375 /* SECONDARY_RELOAD_CLASS. | |
376 We need to reload regs of REMAINDER_REG and HIMULT_REG elsewhere. */ | |
377 | |
378 enum reg_class | |
379 mmix_secondary_reload_class (enum reg_class rclass, | |
380 enum machine_mode mode ATTRIBUTE_UNUSED, | |
381 rtx x ATTRIBUTE_UNUSED, | |
382 int in_p ATTRIBUTE_UNUSED) | |
383 { | |
384 if (rclass == REMAINDER_REG | |
385 || rclass == HIMULT_REG | |
386 || rclass == SYSTEM_REGS) | |
387 return GENERAL_REGS; | |
388 | |
389 return NO_REGS; | |
390 } | |
391 | |
392 /* CONST_OK_FOR_LETTER_P. */ | |
393 | |
394 int | |
395 mmix_const_ok_for_letter_p (HOST_WIDE_INT value, int c) | |
396 { | |
397 return | |
398 (c == 'I' ? value >= 0 && value <= 255 | |
399 : c == 'J' ? value >= 0 && value <= 65535 | |
400 : c == 'K' ? value <= 0 && value >= -255 | |
401 : c == 'L' ? mmix_shiftable_wyde_value (value) | |
402 : c == 'M' ? value == 0 | |
403 : c == 'N' ? mmix_shiftable_wyde_value (~value) | |
404 : c == 'O' ? (value == 3 || value == 5 || value == 9 | |
405 || value == 17) | |
406 : 0); | |
407 } | |
408 | |
409 /* CONST_DOUBLE_OK_FOR_LETTER_P. */ | |
410 | |
411 int | |
412 mmix_const_double_ok_for_letter_p (rtx value, int c) | |
413 { | |
414 return | |
415 (c == 'G' ? value == CONST0_RTX (GET_MODE (value)) | |
416 : 0); | |
417 } | |
418 | |
419 /* EXTRA_CONSTRAINT. | |
420 We need this since our constants are not always expressible as | |
421 CONST_INT:s, but rather often as CONST_DOUBLE:s. */ | |
422 | |
423 int | |
424 mmix_extra_constraint (rtx x, int c, int strict) | |
425 { | |
426 HOST_WIDEST_INT value; | |
427 | |
428 /* When checking for an address, we need to handle strict vs. non-strict | |
429 register checks. Don't use address_operand, but instead its | |
430 equivalent (its callee, which it is just a wrapper for), | |
431 memory_operand_p and the strict-equivalent strict_memory_address_p. */ | |
432 if (c == 'U') | |
433 return | |
434 strict | |
435 ? strict_memory_address_p (Pmode, x) | |
436 : memory_address_p (Pmode, x); | |
437 | |
438 /* R asks whether x is to be loaded with GETA or something else. Right | |
439 now, only a SYMBOL_REF and LABEL_REF can fit for | |
440 TARGET_BASE_ADDRESSES. | |
441 | |
442 Only constant symbolic addresses apply. With TARGET_BASE_ADDRESSES, | |
443 we just allow straight LABEL_REF or SYMBOL_REFs with SYMBOL_REF_FLAG | |
444 set right now; only function addresses and code labels. If we change | |
445 to let SYMBOL_REF_FLAG be set on other symbols, we have to check | |
446 inside CONST expressions. When TARGET_BASE_ADDRESSES is not in | |
447 effect, a "raw" constant check together with mmix_constant_address_p | |
448 is all that's needed; we want all constant addresses to be loaded | |
449 with GETA then. */ | |
450 if (c == 'R') | |
451 return | |
452 GET_CODE (x) != CONST_INT && GET_CODE (x) != CONST_DOUBLE | |
453 && mmix_constant_address_p (x) | |
454 && (! TARGET_BASE_ADDRESSES | |
455 || (GET_CODE (x) == LABEL_REF | |
456 || (GET_CODE (x) == SYMBOL_REF && SYMBOL_REF_FLAG (x)))); | |
457 | |
458 if (GET_CODE (x) != CONST_DOUBLE || GET_MODE (x) != VOIDmode) | |
459 return 0; | |
460 | |
461 value = mmix_intval (x); | |
462 | |
463 /* We used to map Q->J, R->K, S->L, T->N, U->O, but we don't have to any | |
464 more ('U' taken for address_operand, 'R' similarly). Some letters map | |
465 outside of CONST_INT, though; we still use 'S' and 'T'. */ | |
466 if (c == 'S') | |
467 return mmix_shiftable_wyde_value (value); | |
468 else if (c == 'T') | |
469 return mmix_shiftable_wyde_value (~value); | |
470 return 0; | |
471 } | |
472 | |
473 /* DYNAMIC_CHAIN_ADDRESS. */ | |
474 | |
475 rtx | |
476 mmix_dynamic_chain_address (rtx frame) | |
477 { | |
478 /* FIXME: the frame-pointer is stored at offset -8 from the current | |
479 frame-pointer. Unfortunately, the caller assumes that a | |
480 frame-pointer is present for *all* previous frames. There should be | |
481 a way to say that that cannot be done, like for RETURN_ADDR_RTX. */ | |
482 return plus_constant (frame, -8); | |
483 } | |
484 | |
485 /* STARTING_FRAME_OFFSET. */ | |
486 | |
487 int | |
488 mmix_starting_frame_offset (void) | |
489 { | |
490 /* The old frame pointer is in the slot below the new one, so | |
491 FIRST_PARM_OFFSET does not need to depend on whether the | |
492 frame-pointer is needed or not. We have to adjust for the register | |
493 stack pointer being located below the saved frame pointer. | |
494 Similarly, we store the return address on the stack too, for | |
495 exception handling, and always if we save the register stack pointer. */ | |
496 return | |
497 (-8 | |
498 + (MMIX_CFUN_HAS_LANDING_PAD | |
499 ? -16 : (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS ? -8 : 0))); | |
500 } | |
501 | |
502 /* RETURN_ADDR_RTX. */ | |
503 | |
504 rtx | |
505 mmix_return_addr_rtx (int count, rtx frame ATTRIBUTE_UNUSED) | |
506 { | |
507 return count == 0 | |
508 ? (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS | |
509 /* FIXME: Set frame_alias_set on the following. (Why?) | |
510 See mmix_initial_elimination_offset for the reason we can't use | |
511 get_hard_reg_initial_val for both. Always using a stack slot | |
512 and not a register would be suboptimal. */ | |
513 ? validize_mem (gen_rtx_MEM (Pmode, plus_constant (frame_pointer_rtx, -16))) | |
514 : get_hard_reg_initial_val (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)) | |
515 : NULL_RTX; | |
516 } | |
517 | |
518 /* SETUP_FRAME_ADDRESSES. */ | |
519 | |
520 void | |
521 mmix_setup_frame_addresses (void) | |
522 { | |
523 /* Nothing needed at the moment. */ | |
524 } | |
525 | |
526 /* The difference between the (imaginary) frame pointer and the stack | |
527 pointer. Used to eliminate the frame pointer. */ | |
528 | |
529 int | |
530 mmix_initial_elimination_offset (int fromreg, int toreg) | |
531 { | |
532 int regno; | |
533 int fp_sp_offset | |
534 = (get_frame_size () + crtl->outgoing_args_size + 7) & ~7; | |
535 | |
536 /* There is no actual offset between these two virtual values, but for | |
537 the frame-pointer, we have the old one in the stack position below | |
538 it, so the offset for the frame-pointer to the stack-pointer is one | |
539 octabyte larger. */ | |
540 if (fromreg == MMIX_ARG_POINTER_REGNUM | |
541 && toreg == MMIX_FRAME_POINTER_REGNUM) | |
542 return 0; | |
543 | |
544 /* The difference is the size of local variables plus the size of | |
545 outgoing function arguments that would normally be passed as | |
546 registers but must be passed on stack because we're out of | |
547 function-argument registers. Only global saved registers are | |
548 counted; the others go on the register stack. | |
549 | |
550 The frame-pointer is counted too if it is what is eliminated, as we | |
551 need to balance the offset for it from STARTING_FRAME_OFFSET. | |
552 | |
553 Also add in the slot for the register stack pointer we save if we | |
554 have a landing pad. | |
555 | |
556 Unfortunately, we can't access $0..$14, from unwinder code easily, so | |
557 store the return address in a frame slot too. FIXME: Only for | |
558 non-leaf functions. FIXME: Always with a landing pad, because it's | |
559 hard to know whether we need the other at the time we know we need | |
560 the offset for one (and have to state it). It's a kludge until we | |
561 can express the register stack in the EH frame info. | |
562 | |
563 We have to do alignment here; get_frame_size will not return a | |
564 multiple of STACK_BOUNDARY. FIXME: Add note in manual. */ | |
565 | |
566 for (regno = MMIX_FIRST_GLOBAL_REGNUM; | |
567 regno <= 255; | |
568 regno++) | |
569 if ((df_regs_ever_live_p (regno) && ! call_used_regs[regno]) | |
570 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
571 fp_sp_offset += 8; | |
572 | |
573 return fp_sp_offset | |
574 + (MMIX_CFUN_HAS_LANDING_PAD | |
575 ? 16 : (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS ? 8 : 0)) | |
576 + (fromreg == MMIX_ARG_POINTER_REGNUM ? 0 : 8); | |
577 } | |
578 | |
579 /* Return an rtx for a function argument to go in a register, and 0 for | |
580 one that must go on stack. */ | |
581 | |
582 rtx | |
583 mmix_function_arg (const CUMULATIVE_ARGS *argsp, | |
584 enum machine_mode mode, | |
585 tree type, | |
586 int named ATTRIBUTE_UNUSED, | |
587 int incoming) | |
588 { | |
589 /* Last-argument marker. */ | |
590 if (type == void_type_node) | |
591 return (argsp->regs < MMIX_MAX_ARGS_IN_REGS) | |
592 ? gen_rtx_REG (mode, | |
593 (incoming | |
594 ? MMIX_FIRST_INCOMING_ARG_REGNUM | |
595 : MMIX_FIRST_ARG_REGNUM) + argsp->regs) | |
596 : NULL_RTX; | |
597 | |
598 return (argsp->regs < MMIX_MAX_ARGS_IN_REGS | |
599 && !targetm.calls.must_pass_in_stack (mode, type) | |
600 && (GET_MODE_BITSIZE (mode) <= 64 | |
601 || argsp->lib | |
602 || TARGET_LIBFUNC)) | |
603 ? gen_rtx_REG (mode, | |
604 (incoming | |
605 ? MMIX_FIRST_INCOMING_ARG_REGNUM | |
606 : MMIX_FIRST_ARG_REGNUM) | |
607 + argsp->regs) | |
608 : NULL_RTX; | |
609 } | |
610 | |
611 /* Returns nonzero for everything that goes by reference, 0 for | |
612 everything that goes by value. */ | |
613 | |
614 static bool | |
615 mmix_pass_by_reference (CUMULATIVE_ARGS *argsp, enum machine_mode mode, | |
616 const_tree type, bool named ATTRIBUTE_UNUSED) | |
617 { | |
618 /* FIXME: Check: I'm not sure the must_pass_in_stack check is | |
619 necessary. */ | |
620 if (targetm.calls.must_pass_in_stack (mode, type)) | |
621 return true; | |
622 | |
623 if (MMIX_FUNCTION_ARG_SIZE (mode, type) > 8 | |
624 && !TARGET_LIBFUNC | |
625 && (!argsp || !argsp->lib)) | |
626 return true; | |
627 | |
628 return false; | |
629 } | |
630 | |
631 /* Return nonzero if regno is a register number where a parameter is | |
632 passed, and 0 otherwise. */ | |
633 | |
634 int | |
635 mmix_function_arg_regno_p (int regno, int incoming) | |
636 { | |
637 int first_arg_regnum | |
638 = incoming ? MMIX_FIRST_INCOMING_ARG_REGNUM : MMIX_FIRST_ARG_REGNUM; | |
639 | |
640 return regno >= first_arg_regnum | |
641 && regno < first_arg_regnum + MMIX_MAX_ARGS_IN_REGS; | |
642 } | |
643 | |
644 /* FUNCTION_OUTGOING_VALUE. */ | |
645 | |
646 rtx | |
647 mmix_function_outgoing_value (const_tree valtype, const_tree func ATTRIBUTE_UNUSED) | |
648 { | |
649 enum machine_mode mode = TYPE_MODE (valtype); | |
650 enum machine_mode cmode; | |
651 int first_val_regnum = MMIX_OUTGOING_RETURN_VALUE_REGNUM; | |
652 rtx vec[MMIX_MAX_REGS_FOR_VALUE]; | |
653 int i; | |
654 int nregs; | |
655 | |
656 /* Return values that fit in a register need no special handling. | |
657 There's no register hole when parameters are passed in global | |
658 registers. */ | |
659 if (TARGET_ABI_GNU | |
660 || GET_MODE_BITSIZE (mode) <= BITS_PER_WORD) | |
661 return | |
662 gen_rtx_REG (mode, MMIX_OUTGOING_RETURN_VALUE_REGNUM); | |
663 | |
664 if (COMPLEX_MODE_P (mode)) | |
665 /* A complex type, made up of components. */ | |
666 cmode = TYPE_MODE (TREE_TYPE (valtype)); | |
667 else | |
668 { | |
669 /* Of the other larger-than-register modes, we only support | |
670 scalar mode TImode. (At least, that's the only one that's | |
671 been rudimentally tested.) Make sure we're alerted for | |
672 unexpected cases. */ | |
673 if (mode != TImode) | |
674 sorry ("support for mode %qs", GET_MODE_NAME (mode)); | |
675 | |
676 /* In any case, we will fill registers to the natural size. */ | |
677 cmode = DImode; | |
678 } | |
679 | |
680 nregs = ((GET_MODE_BITSIZE (mode) + BITS_PER_WORD - 1) / BITS_PER_WORD); | |
681 | |
682 /* We need to take care of the effect of the register hole on return | |
683 values of large sizes; the last register will appear as the first | |
684 register, with the rest shifted. (For complex modes, this is just | |
685 swapped registers.) */ | |
686 | |
687 if (nregs > MMIX_MAX_REGS_FOR_VALUE) | |
688 internal_error ("too large function value type, needs %d registers,\ | |
689 have only %d registers for this", nregs, MMIX_MAX_REGS_FOR_VALUE); | |
690 | |
691 /* FIXME: Maybe we should handle structure values like this too | |
692 (adjusted for BLKmode), perhaps for both ABI:s. */ | |
693 for (i = 0; i < nregs - 1; i++) | |
694 vec[i] | |
695 = gen_rtx_EXPR_LIST (VOIDmode, | |
696 gen_rtx_REG (cmode, first_val_regnum + i), | |
697 GEN_INT ((i + 1) * BITS_PER_UNIT)); | |
698 | |
699 vec[nregs - 1] | |
700 = gen_rtx_EXPR_LIST (VOIDmode, | |
701 gen_rtx_REG (cmode, first_val_regnum + nregs - 1), | |
702 const0_rtx); | |
703 | |
704 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nregs, vec)); | |
705 } | |
706 | |
707 /* FUNCTION_VALUE_REGNO_P. */ | |
708 | |
709 int | |
710 mmix_function_value_regno_p (int regno) | |
711 { | |
712 return regno == MMIX_RETURN_VALUE_REGNUM; | |
713 } | |
714 | |
715 /* EH_RETURN_DATA_REGNO. */ | |
716 | |
717 int | |
718 mmix_eh_return_data_regno (int n) | |
719 { | |
720 if (n >= 0 && n < 4) | |
721 return MMIX_EH_RETURN_DATA_REGNO_START + n; | |
722 | |
723 return INVALID_REGNUM; | |
724 } | |
725 | |
726 /* EH_RETURN_STACKADJ_RTX. */ | |
727 | |
728 rtx | |
729 mmix_eh_return_stackadj_rtx (void) | |
730 { | |
731 return gen_rtx_REG (Pmode, MMIX_EH_RETURN_STACKADJ_REGNUM); | |
732 } | |
733 | |
734 /* EH_RETURN_HANDLER_RTX. */ | |
735 | |
736 rtx | |
737 mmix_eh_return_handler_rtx (void) | |
738 { | |
739 return gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM); | |
740 } | |
741 | |
742 /* ASM_PREFERRED_EH_DATA_FORMAT. */ | |
743 | |
744 int | |
745 mmix_asm_preferred_eh_data_format (int code ATTRIBUTE_UNUSED, | |
746 int global ATTRIBUTE_UNUSED) | |
747 { | |
748 /* This is the default (was at 2001-07-20). Revisit when needed. */ | |
749 return DW_EH_PE_absptr; | |
750 } | |
751 | |
752 /* Make a note that we've seen the beginning of the prologue. This | |
753 matters to whether we'll translate register numbers as calculated by | |
754 mmix_reorg. */ | |
755 | |
756 static void | |
757 mmix_target_asm_function_prologue (FILE *stream ATTRIBUTE_UNUSED, | |
758 HOST_WIDE_INT framesize ATTRIBUTE_UNUSED) | |
759 { | |
760 cfun->machine->in_prologue = 1; | |
761 } | |
762 | |
763 /* Make a note that we've seen the end of the prologue. */ | |
764 | |
765 static void | |
766 mmix_target_asm_function_end_prologue (FILE *stream ATTRIBUTE_UNUSED) | |
767 { | |
768 cfun->machine->in_prologue = 0; | |
769 } | |
770 | |
771 /* Implement TARGET_MACHINE_DEPENDENT_REORG. No actual rearrangements | |
772 done here; just virtually by calculating the highest saved stack | |
773 register number used to modify the register numbers at output time. */ | |
774 | |
775 static void | |
776 mmix_reorg (void) | |
777 { | |
778 int regno; | |
779 | |
780 /* We put the number of the highest saved register-file register in a | |
781 location convenient for the call-patterns to output. Note that we | |
782 don't tell dwarf2 about these registers, since it can't restore them | |
783 anyway. */ | |
784 for (regno = MMIX_LAST_STACK_REGISTER_REGNUM; | |
785 regno >= 0; | |
786 regno--) | |
787 if ((df_regs_ever_live_p (regno) && !call_used_regs[regno]) | |
788 || (regno == MMIX_FRAME_POINTER_REGNUM && frame_pointer_needed)) | |
789 break; | |
790 | |
791 /* Regardless of whether they're saved (they might be just read), we | |
792 mustn't include registers that carry parameters. We could scan the | |
793 insns to see whether they're actually used (and indeed do other less | |
794 trivial register usage analysis and transformations), but it seems | |
795 wasteful to optimize for unused parameter registers. As of | |
796 2002-04-30, df_regs_ever_live_p (n) seems to be set for only-reads too, but | |
797 that might change. */ | |
798 if (!TARGET_ABI_GNU && regno < crtl->args.info.regs - 1) | |
799 { | |
800 regno = crtl->args.info.regs - 1; | |
801 | |
802 /* We don't want to let this cause us to go over the limit and make | |
803 incoming parameter registers be misnumbered and treating the last | |
804 parameter register and incoming return value register call-saved. | |
805 Stop things at the unmodified scheme. */ | |
806 if (regno > MMIX_RETURN_VALUE_REGNUM - 1) | |
807 regno = MMIX_RETURN_VALUE_REGNUM - 1; | |
808 } | |
809 | |
810 cfun->machine->highest_saved_stack_register = regno; | |
811 } | |
812 | |
813 /* TARGET_ASM_FUNCTION_EPILOGUE. */ | |
814 | |
815 static void | |
816 mmix_target_asm_function_epilogue (FILE *stream, | |
817 HOST_WIDE_INT locals_size ATTRIBUTE_UNUSED) | |
818 { | |
819 /* Emit an \n for readability of the generated assembly. */ | |
820 fputc ('\n', stream); | |
821 } | |
822 | |
823 /* TARGET_ASM_OUTPUT_MI_THUNK. */ | |
824 | |
825 static void | |
826 mmix_asm_output_mi_thunk (FILE *stream, | |
827 tree fndecl ATTRIBUTE_UNUSED, | |
828 HOST_WIDE_INT delta, | |
829 HOST_WIDE_INT vcall_offset ATTRIBUTE_UNUSED, | |
830 tree func) | |
831 { | |
832 /* If you define TARGET_STRUCT_VALUE_RTX that returns 0 (i.e. pass | |
833 location of structure to return as invisible first argument), you | |
834 need to tweak this code too. */ | |
835 const char *regname = reg_names[MMIX_FIRST_INCOMING_ARG_REGNUM]; | |
836 | |
837 if (delta >= 0 && delta < 65536) | |
838 fprintf (stream, "\tINCL %s,%d\n", regname, (int)delta); | |
839 else if (delta < 0 && delta >= -255) | |
840 fprintf (stream, "\tSUBU %s,%s,%d\n", regname, regname, (int)-delta); | |
841 else | |
842 { | |
843 mmix_output_register_setting (stream, 255, delta, 1); | |
844 fprintf (stream, "\tADDU %s,%s,$255\n", regname, regname); | |
845 } | |
846 | |
847 fprintf (stream, "\tJMP "); | |
848 assemble_name (stream, XSTR (XEXP (DECL_RTL (func), 0), 0)); | |
849 fprintf (stream, "\n"); | |
850 } | |
851 | |
852 /* FUNCTION_PROFILER. */ | |
853 | |
854 void | |
855 mmix_function_profiler (FILE *stream ATTRIBUTE_UNUSED, | |
856 int labelno ATTRIBUTE_UNUSED) | |
857 { | |
858 sorry ("function_profiler support for MMIX"); | |
859 } | |
860 | |
861 /* Worker function for TARGET_SETUP_INCOMING_VARARGS. For the moment, | |
862 let's stick to pushing argument registers on the stack. Later, we | |
863 can parse all arguments in registers, to improve performance. */ | |
864 | |
865 static void | |
866 mmix_setup_incoming_varargs (CUMULATIVE_ARGS *args_so_farp, | |
867 enum machine_mode mode, | |
868 tree vartype, | |
869 int *pretend_sizep, | |
870 int second_time ATTRIBUTE_UNUSED) | |
871 { | |
872 /* The last named variable has been handled, but | |
873 args_so_farp has not been advanced for it. */ | |
874 if (args_so_farp->regs + 1 < MMIX_MAX_ARGS_IN_REGS) | |
875 *pretend_sizep = (MMIX_MAX_ARGS_IN_REGS - (args_so_farp->regs + 1)) * 8; | |
876 | |
877 /* We assume that one argument takes up one register here. That should | |
878 be true until we start messing with multi-reg parameters. */ | |
879 if ((7 + (MMIX_FUNCTION_ARG_SIZE (mode, vartype))) / 8 != 1) | |
880 internal_error ("MMIX Internal: Last named vararg would not fit in a register"); | |
881 } | |
882 | |
883 /* TRAMPOLINE_SIZE. */ | |
884 /* Four 4-byte insns plus two 8-byte values. */ | |
885 int mmix_trampoline_size = 32; | |
886 | |
887 | |
888 /* TRAMPOLINE_TEMPLATE. */ | |
889 | |
890 void | |
891 mmix_trampoline_template (FILE *stream) | |
892 { | |
893 /* Read a value into the static-chain register and jump somewhere. The | |
894 static chain is stored at offset 16, and the function address is | |
895 stored at offset 24. */ | |
896 /* FIXME: GCC copies this using *intsize* (tetra), when it should use | |
897 register size (octa). */ | |
898 fprintf (stream, "\tGETA $255,1F\n\t"); | |
899 fprintf (stream, "LDOU %s,$255,0\n\t", | |
900 reg_names[MMIX_STATIC_CHAIN_REGNUM]); | |
901 fprintf (stream, "LDOU $255,$255,8\n\t"); | |
902 fprintf (stream, "GO $255,$255,0\n"); | |
903 fprintf (stream, "1H\tOCTA 0\n\t"); | |
904 fprintf (stream, "OCTA 0\n"); | |
905 } | |
906 | |
907 /* INITIALIZE_TRAMPOLINE. */ | |
908 /* Set the static chain and function pointer field in the trampoline. | |
909 We also SYNCID here to be sure (doesn't matter in the simulator, but | |
910 some day it will). */ | |
911 | |
912 void | |
913 mmix_initialize_trampoline (rtx trampaddr, rtx fnaddr, rtx static_chain) | |
914 { | |
915 emit_move_insn (gen_rtx_MEM (DImode, plus_constant (trampaddr, 16)), | |
916 static_chain); | |
917 emit_move_insn (gen_rtx_MEM (DImode, | |
918 plus_constant (trampaddr, 24)), | |
919 fnaddr); | |
920 emit_insn (gen_sync_icache (validize_mem (gen_rtx_MEM (DImode, | |
921 trampaddr)), | |
922 GEN_INT (mmix_trampoline_size - 1))); | |
923 } | |
924 | |
925 /* We must exclude constant addresses that have an increment that is not a | |
926 multiple of four bytes because of restrictions of the GETA | |
927 instruction, unless TARGET_BASE_ADDRESSES. */ | |
928 | |
929 int | |
930 mmix_constant_address_p (rtx x) | |
931 { | |
932 RTX_CODE code = GET_CODE (x); | |
933 int addend = 0; | |
934 /* When using "base addresses", anything constant goes. */ | |
935 int constant_ok = TARGET_BASE_ADDRESSES != 0; | |
936 | |
937 switch (code) | |
938 { | |
939 case LABEL_REF: | |
940 case SYMBOL_REF: | |
941 return 1; | |
942 | |
943 case HIGH: | |
944 /* FIXME: Don't know how to dissect these. Avoid them for now, | |
945 except we know they're constants. */ | |
946 return constant_ok; | |
947 | |
948 case CONST_INT: | |
949 addend = INTVAL (x); | |
950 break; | |
951 | |
952 case CONST_DOUBLE: | |
953 if (GET_MODE (x) != VOIDmode) | |
954 /* Strange that we got here. FIXME: Check if we do. */ | |
955 return constant_ok; | |
956 addend = CONST_DOUBLE_LOW (x); | |
957 break; | |
958 | |
959 case CONST: | |
960 /* Note that expressions with arithmetic on forward references don't | |
961 work in mmixal. People using gcc assembly code with mmixal might | |
962 need to move arrays and such to before the point of use. */ | |
963 if (GET_CODE (XEXP (x, 0)) == PLUS) | |
964 { | |
965 rtx x0 = XEXP (XEXP (x, 0), 0); | |
966 rtx x1 = XEXP (XEXP (x, 0), 1); | |
967 | |
968 if ((GET_CODE (x0) == SYMBOL_REF | |
969 || GET_CODE (x0) == LABEL_REF) | |
970 && (GET_CODE (x1) == CONST_INT | |
971 || (GET_CODE (x1) == CONST_DOUBLE | |
972 && GET_MODE (x1) == VOIDmode))) | |
973 addend = mmix_intval (x1); | |
974 else | |
975 return constant_ok; | |
976 } | |
977 else | |
978 return constant_ok; | |
979 break; | |
980 | |
981 default: | |
982 return 0; | |
983 } | |
984 | |
985 return constant_ok || (addend & 3) == 0; | |
986 } | |
987 | |
988 /* Return 1 if the address is OK, otherwise 0. | |
989 Used by GO_IF_LEGITIMATE_ADDRESS. */ | |
990 | |
991 int | |
992 mmix_legitimate_address (enum machine_mode mode ATTRIBUTE_UNUSED, | |
993 rtx x, | |
994 int strict_checking) | |
995 { | |
996 #define MMIX_REG_OK(X) \ | |
997 ((strict_checking \ | |
998 && (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \ | |
999 || (reg_renumber[REGNO (X)] > 0 \ | |
1000 && reg_renumber[REGNO (X)] <= MMIX_LAST_GENERAL_REGISTER))) \ | |
1001 || (!strict_checking \ | |
1002 && (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \ | |
1003 || REGNO (X) >= FIRST_PSEUDO_REGISTER \ | |
1004 || REGNO (X) == ARG_POINTER_REGNUM))) | |
1005 | |
1006 /* We only accept: | |
1007 (mem reg) | |
1008 (mem (plus reg reg)) | |
1009 (mem (plus reg 0..255)). | |
1010 unless TARGET_BASE_ADDRESSES, in which case we accept all | |
1011 (mem constant_address) too. */ | |
1012 | |
1013 | |
1014 /* (mem reg) */ | |
1015 if (REG_P (x) && MMIX_REG_OK (x)) | |
1016 return 1; | |
1017 | |
1018 if (GET_CODE(x) == PLUS) | |
1019 { | |
1020 rtx x1 = XEXP (x, 0); | |
1021 rtx x2 = XEXP (x, 1); | |
1022 | |
1023 /* Try swapping the order. FIXME: Do we need this? */ | |
1024 if (! REG_P (x1)) | |
1025 { | |
1026 rtx tem = x1; | |
1027 x1 = x2; | |
1028 x2 = tem; | |
1029 } | |
1030 | |
1031 /* (mem (plus (reg?) (?))) */ | |
1032 if (!REG_P (x1) || !MMIX_REG_OK (x1)) | |
1033 return TARGET_BASE_ADDRESSES && mmix_constant_address_p (x); | |
1034 | |
1035 /* (mem (plus (reg) (reg?))) */ | |
1036 if (REG_P (x2) && MMIX_REG_OK (x2)) | |
1037 return 1; | |
1038 | |
1039 /* (mem (plus (reg) (0..255?))) */ | |
1040 if (GET_CODE (x2) == CONST_INT | |
1041 && CONST_OK_FOR_LETTER_P (INTVAL (x2), 'I')) | |
1042 return 1; | |
1043 | |
1044 return 0; | |
1045 } | |
1046 | |
1047 return TARGET_BASE_ADDRESSES && mmix_constant_address_p (x); | |
1048 } | |
1049 | |
1050 /* LEGITIMATE_CONSTANT_P. */ | |
1051 | |
1052 int | |
1053 mmix_legitimate_constant_p (rtx x) | |
1054 { | |
1055 RTX_CODE code = GET_CODE (x); | |
1056 | |
1057 /* We must allow any number due to the way the cse passes works; if we | |
1058 do not allow any number here, general_operand will fail, and insns | |
1059 will fatally fail recognition instead of "softly". */ | |
1060 if (code == CONST_INT || code == CONST_DOUBLE) | |
1061 return 1; | |
1062 | |
1063 return CONSTANT_ADDRESS_P (x); | |
1064 } | |
1065 | |
1066 /* SELECT_CC_MODE. */ | |
1067 | |
1068 enum machine_mode | |
1069 mmix_select_cc_mode (RTX_CODE op, rtx x, rtx y ATTRIBUTE_UNUSED) | |
1070 { | |
1071 /* We use CCmode, CC_UNSmode, CC_FPmode, CC_FPEQmode and CC_FUNmode to | |
1072 output different compare insns. Note that we do not check the | |
1073 validity of the comparison here. */ | |
1074 | |
1075 if (GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT) | |
1076 { | |
1077 if (op == ORDERED || op == UNORDERED || op == UNGE | |
1078 || op == UNGT || op == UNLE || op == UNLT) | |
1079 return CC_FUNmode; | |
1080 | |
1081 if (op == EQ || op == NE) | |
1082 return CC_FPEQmode; | |
1083 | |
1084 return CC_FPmode; | |
1085 } | |
1086 | |
1087 if (op == GTU || op == LTU || op == GEU || op == LEU) | |
1088 return CC_UNSmode; | |
1089 | |
1090 return CCmode; | |
1091 } | |
1092 | |
1093 /* REVERSIBLE_CC_MODE. */ | |
1094 | |
1095 int | |
1096 mmix_reversible_cc_mode (enum machine_mode mode) | |
1097 { | |
1098 /* That is, all integer and the EQ, NE, ORDERED and UNORDERED float | |
1099 compares. */ | |
1100 return mode != CC_FPmode; | |
1101 } | |
1102 | |
1103 /* TARGET_RTX_COSTS. */ | |
1104 | |
1105 static bool | |
1106 mmix_rtx_costs (rtx x ATTRIBUTE_UNUSED, | |
1107 int code ATTRIBUTE_UNUSED, | |
1108 int outer_code ATTRIBUTE_UNUSED, | |
1109 int *total ATTRIBUTE_UNUSED, | |
1110 bool speed ATTRIBUTE_UNUSED) | |
1111 { | |
1112 /* For the time being, this is just a stub and we'll accept the | |
1113 generic calculations, until we can do measurements, at least. | |
1114 Say we did not modify any calculated costs. */ | |
1115 return false; | |
1116 } | |
1117 | |
1118 /* REGISTER_MOVE_COST. */ | |
1119 | |
1120 int | |
1121 mmix_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED, | |
1122 enum reg_class from, | |
1123 enum reg_class to) | |
1124 { | |
1125 return (from == GENERAL_REGS && from == to) ? 2 : 3; | |
1126 } | |
1127 | |
1128 /* Note that we don't have a TEXT_SECTION_ASM_OP, because it has to be a | |
1129 compile-time constant; it's used in an asm in crtstuff.c, compiled for | |
1130 the target. */ | |
1131 | |
1132 /* DATA_SECTION_ASM_OP. */ | |
1133 | |
1134 const char * | |
1135 mmix_data_section_asm_op (void) | |
1136 { | |
1137 return "\t.data ! mmixal:= 8H LOC 9B"; | |
1138 } | |
1139 | |
1140 static void | |
1141 mmix_encode_section_info (tree decl, rtx rtl, int first) | |
1142 { | |
1143 /* Test for an external declaration, and do nothing if it is one. */ | |
1144 if ((TREE_CODE (decl) == VAR_DECL | |
1145 && (DECL_EXTERNAL (decl) || TREE_PUBLIC (decl))) | |
1146 || (TREE_CODE (decl) == FUNCTION_DECL && TREE_PUBLIC (decl))) | |
1147 ; | |
1148 else if (first && DECL_P (decl)) | |
1149 { | |
1150 /* For non-visible declarations, add a "@" prefix, which we skip | |
1151 when the label is output. If the label does not have this | |
1152 prefix, a ":" is output if -mtoplevel-symbols. | |
1153 | |
1154 Note that this does not work for data that is declared extern and | |
1155 later defined as static. If there's code in between, that code | |
1156 will refer to the extern declaration, and vice versa. This just | |
1157 means that when -mtoplevel-symbols is in use, we can just handle | |
1158 well-behaved ISO-compliant code. */ | |
1159 | |
1160 const char *str = XSTR (XEXP (rtl, 0), 0); | |
1161 int len = strlen (str); | |
1162 char *newstr = XALLOCAVEC (char, len + 2); | |
1163 newstr[0] = '@'; | |
1164 strcpy (newstr + 1, str); | |
1165 XSTR (XEXP (rtl, 0), 0) = ggc_alloc_string (newstr, len + 1); | |
1166 } | |
1167 | |
1168 /* Set SYMBOL_REF_FLAG for things that we want to access with GETA. We | |
1169 may need different options to reach for different things with GETA. | |
1170 For now, functions and things we know or have been told are constant. */ | |
1171 if (TREE_CODE (decl) == FUNCTION_DECL | |
1172 || TREE_CONSTANT (decl) | |
1173 || (TREE_CODE (decl) == VAR_DECL | |
1174 && TREE_READONLY (decl) | |
1175 && !TREE_SIDE_EFFECTS (decl) | |
1176 && (!DECL_INITIAL (decl) | |
1177 || TREE_CONSTANT (DECL_INITIAL (decl))))) | |
1178 SYMBOL_REF_FLAG (XEXP (rtl, 0)) = 1; | |
1179 } | |
1180 | |
1181 static const char * | |
1182 mmix_strip_name_encoding (const char *name) | |
1183 { | |
1184 for (; (*name == '@' || *name == '*'); name++) | |
1185 ; | |
1186 | |
1187 return name; | |
1188 } | |
1189 | |
1190 /* TARGET_ASM_FILE_START. | |
1191 We just emit a little comment for the time being. */ | |
1192 | |
1193 static void | |
1194 mmix_file_start (void) | |
1195 { | |
1196 default_file_start (); | |
1197 | |
1198 fputs ("! mmixal:= 8H LOC Data_Section\n", asm_out_file); | |
1199 | |
1200 /* Make sure each file starts with the text section. */ | |
1201 switch_to_section (text_section); | |
1202 } | |
1203 | |
1204 /* TARGET_ASM_FILE_END. */ | |
1205 | |
1206 static void | |
1207 mmix_file_end (void) | |
1208 { | |
1209 /* Make sure each file ends with the data section. */ | |
1210 switch_to_section (data_section); | |
1211 } | |
1212 | |
1213 /* ASM_OUTPUT_SOURCE_FILENAME. */ | |
1214 | |
1215 void | |
1216 mmix_asm_output_source_filename (FILE *stream, const char *name) | |
1217 { | |
1218 fprintf (stream, "# 1 "); | |
1219 OUTPUT_QUOTED_STRING (stream, name); | |
1220 fprintf (stream, "\n"); | |
1221 } | |
1222 | |
1223 /* OUTPUT_QUOTED_STRING. */ | |
1224 | |
1225 void | |
1226 mmix_output_quoted_string (FILE *stream, const char *string, int length) | |
1227 { | |
1228 const char * string_end = string + length; | |
1229 static const char *const unwanted_chars = "\"[]\\"; | |
1230 | |
1231 /* Output "any character except newline and double quote character". We | |
1232 play it safe and avoid all control characters too. We also do not | |
1233 want [] as characters, should input be passed through m4 with [] as | |
1234 quotes. Further, we avoid "\", because the GAS port handles it as a | |
1235 quoting character. */ | |
1236 while (string < string_end) | |
1237 { | |
1238 if (*string | |
1239 && (unsigned char) *string < 128 | |
1240 && !ISCNTRL (*string) | |
1241 && strchr (unwanted_chars, *string) == NULL) | |
1242 { | |
1243 fputc ('"', stream); | |
1244 while (*string | |
1245 && (unsigned char) *string < 128 | |
1246 && !ISCNTRL (*string) | |
1247 && strchr (unwanted_chars, *string) == NULL | |
1248 && string < string_end) | |
1249 { | |
1250 fputc (*string, stream); | |
1251 string++; | |
1252 } | |
1253 fputc ('"', stream); | |
1254 if (string < string_end) | |
1255 fprintf (stream, ","); | |
1256 } | |
1257 if (string < string_end) | |
1258 { | |
1259 fprintf (stream, "#%x", *string & 255); | |
1260 string++; | |
1261 if (string < string_end) | |
1262 fprintf (stream, ","); | |
1263 } | |
1264 } | |
1265 } | |
1266 | |
1267 /* Target hook for assembling integer objects. Use mmix_print_operand | |
1268 for WYDE and TETRA. Use mmix_output_octa to output 8-byte | |
1269 CONST_DOUBLEs. */ | |
1270 | |
1271 static bool | |
1272 mmix_assemble_integer (rtx x, unsigned int size, int aligned_p) | |
1273 { | |
1274 if (aligned_p) | |
1275 switch (size) | |
1276 { | |
1277 /* We handle a limited number of types of operands in here. But | |
1278 that's ok, because we can punt to generic functions. We then | |
1279 pretend that aligned data isn't needed, so the usual .<pseudo> | |
1280 syntax is used (which works for aligned data too). We actually | |
1281 *must* do that, since we say we don't have simple aligned | |
1282 pseudos, causing this function to be called. We just try and | |
1283 keep as much compatibility as possible with mmixal syntax for | |
1284 normal cases (i.e. without GNU extensions and C only). */ | |
1285 case 1: | |
1286 if (GET_CODE (x) != CONST_INT) | |
1287 { | |
1288 aligned_p = 0; | |
1289 break; | |
1290 } | |
1291 fputs ("\tBYTE\t", asm_out_file); | |
1292 mmix_print_operand (asm_out_file, x, 'B'); | |
1293 fputc ('\n', asm_out_file); | |
1294 return true; | |
1295 | |
1296 case 2: | |
1297 if (GET_CODE (x) != CONST_INT) | |
1298 { | |
1299 aligned_p = 0; | |
1300 break; | |
1301 } | |
1302 fputs ("\tWYDE\t", asm_out_file); | |
1303 mmix_print_operand (asm_out_file, x, 'W'); | |
1304 fputc ('\n', asm_out_file); | |
1305 return true; | |
1306 | |
1307 case 4: | |
1308 if (GET_CODE (x) != CONST_INT) | |
1309 { | |
1310 aligned_p = 0; | |
1311 break; | |
1312 } | |
1313 fputs ("\tTETRA\t", asm_out_file); | |
1314 mmix_print_operand (asm_out_file, x, 'L'); | |
1315 fputc ('\n', asm_out_file); | |
1316 return true; | |
1317 | |
1318 case 8: | |
1319 /* We don't get here anymore for CONST_DOUBLE, because DImode | |
1320 isn't expressed as CONST_DOUBLE, and DFmode is handled | |
1321 elsewhere. */ | |
1322 gcc_assert (GET_CODE (x) != CONST_DOUBLE); | |
1323 assemble_integer_with_op ("\tOCTA\t", x); | |
1324 return true; | |
1325 } | |
1326 return default_assemble_integer (x, size, aligned_p); | |
1327 } | |
1328 | |
1329 /* ASM_OUTPUT_ASCII. */ | |
1330 | |
1331 void | |
1332 mmix_asm_output_ascii (FILE *stream, const char *string, int length) | |
1333 { | |
1334 while (length > 0) | |
1335 { | |
1336 int chunk_size = length > 60 ? 60 : length; | |
1337 fprintf (stream, "\tBYTE "); | |
1338 mmix_output_quoted_string (stream, string, chunk_size); | |
1339 string += chunk_size; | |
1340 length -= chunk_size; | |
1341 fprintf (stream, "\n"); | |
1342 } | |
1343 } | |
1344 | |
1345 /* ASM_OUTPUT_ALIGNED_COMMON. */ | |
1346 | |
1347 void | |
1348 mmix_asm_output_aligned_common (FILE *stream, | |
1349 const char *name, | |
1350 int size, | |
1351 int align) | |
1352 { | |
1353 /* This is mostly the elfos.h one. There doesn't seem to be a way to | |
1354 express this in a mmixal-compatible way. */ | |
1355 fprintf (stream, "\t.comm\t"); | |
1356 assemble_name (stream, name); | |
1357 fprintf (stream, ",%u,%u ! mmixal-incompatible COMMON\n", | |
1358 size, align / BITS_PER_UNIT); | |
1359 } | |
1360 | |
1361 /* ASM_OUTPUT_ALIGNED_LOCAL. */ | |
1362 | |
1363 void | |
1364 mmix_asm_output_aligned_local (FILE *stream, | |
1365 const char *name, | |
1366 int size, | |
1367 int align) | |
1368 { | |
1369 switch_to_section (data_section); | |
1370 | |
1371 ASM_OUTPUT_ALIGN (stream, exact_log2 (align/BITS_PER_UNIT)); | |
1372 assemble_name (stream, name); | |
1373 fprintf (stream, "\tLOC @+%d\n", size); | |
1374 } | |
1375 | |
1376 /* ASM_OUTPUT_LABEL. */ | |
1377 | |
1378 void | |
1379 mmix_asm_output_label (FILE *stream, const char *name) | |
1380 { | |
1381 assemble_name (stream, name); | |
1382 fprintf (stream, "\tIS @\n"); | |
1383 } | |
1384 | |
1385 /* ASM_OUTPUT_INTERNAL_LABEL. */ | |
1386 | |
1387 void | |
1388 mmix_asm_output_internal_label (FILE *stream, const char *name) | |
1389 { | |
1390 assemble_name_raw (stream, name); | |
1391 fprintf (stream, "\tIS @\n"); | |
1392 } | |
1393 | |
1394 /* ASM_DECLARE_REGISTER_GLOBAL. */ | |
1395 | |
1396 void | |
1397 mmix_asm_declare_register_global (FILE *stream ATTRIBUTE_UNUSED, | |
1398 tree decl ATTRIBUTE_UNUSED, | |
1399 int regno ATTRIBUTE_UNUSED, | |
1400 const char *name ATTRIBUTE_UNUSED) | |
1401 { | |
1402 /* Nothing to do here, but there *will* be, therefore the framework is | |
1403 here. */ | |
1404 } | |
1405 | |
1406 /* ASM_WEAKEN_LABEL. */ | |
1407 | |
1408 void | |
1409 mmix_asm_weaken_label (FILE *stream ATTRIBUTE_UNUSED, | |
1410 const char *name ATTRIBUTE_UNUSED) | |
1411 { | |
1412 fprintf (stream, "\t.weak "); | |
1413 assemble_name (stream, name); | |
1414 fprintf (stream, " ! mmixal-incompatible\n"); | |
1415 } | |
1416 | |
1417 /* MAKE_DECL_ONE_ONLY. */ | |
1418 | |
1419 void | |
1420 mmix_make_decl_one_only (tree decl) | |
1421 { | |
1422 DECL_WEAK (decl) = 1; | |
1423 } | |
1424 | |
1425 /* ASM_OUTPUT_LABELREF. | |
1426 Strip GCC's '*' and our own '@'. No order is assumed. */ | |
1427 | |
1428 void | |
1429 mmix_asm_output_labelref (FILE *stream, const char *name) | |
1430 { | |
1431 int is_extern = 1; | |
1432 | |
1433 for (; (*name == '@' || *name == '*'); name++) | |
1434 if (*name == '@') | |
1435 is_extern = 0; | |
1436 | |
1437 asm_fprintf (stream, "%s%U%s", | |
1438 is_extern && TARGET_TOPLEVEL_SYMBOLS ? ":" : "", | |
1439 name); | |
1440 } | |
1441 | |
1442 /* ASM_OUTPUT_DEF. */ | |
1443 | |
1444 void | |
1445 mmix_asm_output_def (FILE *stream, const char *name, const char *value) | |
1446 { | |
1447 assemble_name (stream, name); | |
1448 fprintf (stream, "\tIS "); | |
1449 assemble_name (stream, value); | |
1450 fputc ('\n', stream); | |
1451 } | |
1452 | |
1453 /* PRINT_OPERAND. */ | |
1454 | |
1455 void | |
1456 mmix_print_operand (FILE *stream, rtx x, int code) | |
1457 { | |
1458 /* When we add support for different codes later, we can, when needed, | |
1459 drop through to the main handler with a modified operand. */ | |
1460 rtx modified_x = x; | |
1461 int regno = x != NULL_RTX && REG_P (x) ? REGNO (x) : 0; | |
1462 | |
1463 switch (code) | |
1464 { | |
1465 /* Unrelated codes are in alphabetic order. */ | |
1466 | |
1467 case '+': | |
1468 /* For conditional branches, output "P" for a probable branch. */ | |
1469 if (TARGET_BRANCH_PREDICT) | |
1470 { | |
1471 x = find_reg_note (current_output_insn, REG_BR_PROB, 0); | |
1472 if (x && INTVAL (XEXP (x, 0)) > REG_BR_PROB_BASE / 2) | |
1473 putc ('P', stream); | |
1474 } | |
1475 return; | |
1476 | |
1477 case '.': | |
1478 /* For the %d in POP %d,0. */ | |
1479 fprintf (stream, "%d", MMIX_POP_ARGUMENT ()); | |
1480 return; | |
1481 | |
1482 case 'B': | |
1483 if (GET_CODE (x) != CONST_INT) | |
1484 fatal_insn ("MMIX Internal: Expected a CONST_INT, not this", x); | |
1485 fprintf (stream, "%d", (int) (INTVAL (x) & 0xff)); | |
1486 return; | |
1487 | |
1488 case 'H': | |
1489 /* Highpart. Must be general register, and not the last one, as | |
1490 that one cannot be part of a consecutive register pair. */ | |
1491 if (regno > MMIX_LAST_GENERAL_REGISTER - 1) | |
1492 internal_error ("MMIX Internal: Bad register: %d", regno); | |
1493 | |
1494 /* This is big-endian, so the high-part is the first one. */ | |
1495 fprintf (stream, "%s", reg_names[MMIX_OUTPUT_REGNO (regno)]); | |
1496 return; | |
1497 | |
1498 case 'L': | |
1499 /* Lowpart. Must be CONST_INT or general register, and not the last | |
1500 one, as that one cannot be part of a consecutive register pair. */ | |
1501 if (GET_CODE (x) == CONST_INT) | |
1502 { | |
1503 fprintf (stream, "#%lx", | |
1504 (unsigned long) (INTVAL (x) | |
1505 & ((unsigned int) 0x7fffffff * 2 + 1))); | |
1506 return; | |
1507 } | |
1508 | |
1509 if (GET_CODE (x) == SYMBOL_REF) | |
1510 { | |
1511 output_addr_const (stream, x); | |
1512 return; | |
1513 } | |
1514 | |
1515 if (regno > MMIX_LAST_GENERAL_REGISTER - 1) | |
1516 internal_error ("MMIX Internal: Bad register: %d", regno); | |
1517 | |
1518 /* This is big-endian, so the low-part is + 1. */ | |
1519 fprintf (stream, "%s", reg_names[MMIX_OUTPUT_REGNO (regno) + 1]); | |
1520 return; | |
1521 | |
1522 /* Can't use 'a' because that's a generic modifier for address | |
1523 output. */ | |
1524 case 'A': | |
1525 mmix_output_shiftvalue_op_from_str (stream, "ANDN", | |
1526 ~(unsigned HOST_WIDEST_INT) | |
1527 mmix_intval (x)); | |
1528 return; | |
1529 | |
1530 case 'i': | |
1531 mmix_output_shiftvalue_op_from_str (stream, "INC", | |
1532 (unsigned HOST_WIDEST_INT) | |
1533 mmix_intval (x)); | |
1534 return; | |
1535 | |
1536 case 'o': | |
1537 mmix_output_shiftvalue_op_from_str (stream, "OR", | |
1538 (unsigned HOST_WIDEST_INT) | |
1539 mmix_intval (x)); | |
1540 return; | |
1541 | |
1542 case 's': | |
1543 mmix_output_shiftvalue_op_from_str (stream, "SET", | |
1544 (unsigned HOST_WIDEST_INT) | |
1545 mmix_intval (x)); | |
1546 return; | |
1547 | |
1548 case 'd': | |
1549 case 'D': | |
1550 mmix_output_condition (stream, x, (code == 'D')); | |
1551 return; | |
1552 | |
1553 case 'e': | |
1554 /* Output an extra "e" to make fcmpe, fune. */ | |
1555 if (TARGET_FCMP_EPSILON) | |
1556 fprintf (stream, "e"); | |
1557 return; | |
1558 | |
1559 case 'm': | |
1560 /* Output the number minus 1. */ | |
1561 if (GET_CODE (x) != CONST_INT) | |
1562 { | |
1563 fatal_insn ("MMIX Internal: Bad value for 'm', not a CONST_INT", | |
1564 x); | |
1565 } | |
1566 fprintf (stream, HOST_WIDEST_INT_PRINT_DEC, | |
1567 (HOST_WIDEST_INT) (mmix_intval (x) - 1)); | |
1568 return; | |
1569 | |
1570 case 'p': | |
1571 /* Store the number of registers we want to save. This was setup | |
1572 by the prologue. The actual operand contains the number of | |
1573 registers to pass, but we don't use it currently. Anyway, we | |
1574 need to output the number of saved registers here. */ | |
1575 fprintf (stream, "%d", | |
1576 cfun->machine->highest_saved_stack_register + 1); | |
1577 return; | |
1578 | |
1579 case 'r': | |
1580 /* Store the register to output a constant to. */ | |
1581 if (! REG_P (x)) | |
1582 fatal_insn ("MMIX Internal: Expected a register, not this", x); | |
1583 mmix_output_destination_register = MMIX_OUTPUT_REGNO (regno); | |
1584 return; | |
1585 | |
1586 case 'I': | |
1587 /* Output the constant. Note that we use this for floats as well. */ | |
1588 if (GET_CODE (x) != CONST_INT | |
1589 && (GET_CODE (x) != CONST_DOUBLE | |
1590 || (GET_MODE (x) != VOIDmode && GET_MODE (x) != DFmode | |
1591 && GET_MODE (x) != SFmode))) | |
1592 fatal_insn ("MMIX Internal: Expected a constant, not this", x); | |
1593 mmix_output_register_setting (stream, | |
1594 mmix_output_destination_register, | |
1595 mmix_intval (x), 0); | |
1596 return; | |
1597 | |
1598 case 'U': | |
1599 /* An U for unsigned, if TARGET_ZERO_EXTEND. Ignore the operand. */ | |
1600 if (TARGET_ZERO_EXTEND) | |
1601 putc ('U', stream); | |
1602 return; | |
1603 | |
1604 case 'v': | |
1605 mmix_output_shifted_value (stream, (HOST_WIDEST_INT) mmix_intval (x)); | |
1606 return; | |
1607 | |
1608 case 'V': | |
1609 mmix_output_shifted_value (stream, (HOST_WIDEST_INT) ~mmix_intval (x)); | |
1610 return; | |
1611 | |
1612 case 'W': | |
1613 if (GET_CODE (x) != CONST_INT) | |
1614 fatal_insn ("MMIX Internal: Expected a CONST_INT, not this", x); | |
1615 fprintf (stream, "#%x", (int) (INTVAL (x) & 0xffff)); | |
1616 return; | |
1617 | |
1618 case 0: | |
1619 /* Nothing to do. */ | |
1620 break; | |
1621 | |
1622 default: | |
1623 /* Presumably there's a missing case above if we get here. */ | |
1624 internal_error ("MMIX Internal: Missing %qc case in mmix_print_operand", code); | |
1625 } | |
1626 | |
1627 switch (GET_CODE (modified_x)) | |
1628 { | |
1629 case REG: | |
1630 regno = REGNO (modified_x); | |
1631 if (regno >= FIRST_PSEUDO_REGISTER) | |
1632 internal_error ("MMIX Internal: Bad register: %d", regno); | |
1633 fprintf (stream, "%s", reg_names[MMIX_OUTPUT_REGNO (regno)]); | |
1634 return; | |
1635 | |
1636 case MEM: | |
1637 output_address (XEXP (modified_x, 0)); | |
1638 return; | |
1639 | |
1640 case CONST_INT: | |
1641 /* For -2147483648, mmixal complains that the constant does not fit | |
1642 in 4 bytes, so let's output it as hex. Take care to handle hosts | |
1643 where HOST_WIDE_INT is longer than an int. | |
1644 | |
1645 Print small constants +-255 using decimal. */ | |
1646 | |
1647 if (INTVAL (modified_x) > -256 && INTVAL (modified_x) < 256) | |
1648 fprintf (stream, "%d", (int) (INTVAL (modified_x))); | |
1649 else | |
1650 fprintf (stream, "#%x", | |
1651 (int) (INTVAL (modified_x)) & (unsigned int) ~0); | |
1652 return; | |
1653 | |
1654 case CONST_DOUBLE: | |
1655 /* Do somewhat as CONST_INT. */ | |
1656 mmix_output_octa (stream, mmix_intval (modified_x), 0); | |
1657 return; | |
1658 | |
1659 case CONST: | |
1660 output_addr_const (stream, modified_x); | |
1661 return; | |
1662 | |
1663 default: | |
1664 /* No need to test for all strange things. Let output_addr_const do | |
1665 it for us. */ | |
1666 if (CONSTANT_P (modified_x) | |
1667 /* Strangely enough, this is not included in CONSTANT_P. | |
1668 FIXME: Ask/check about sanity here. */ | |
1669 || GET_CODE (modified_x) == CODE_LABEL) | |
1670 { | |
1671 output_addr_const (stream, modified_x); | |
1672 return; | |
1673 } | |
1674 | |
1675 /* We need the original here. */ | |
1676 fatal_insn ("MMIX Internal: Cannot decode this operand", x); | |
1677 } | |
1678 } | |
1679 | |
1680 /* PRINT_OPERAND_PUNCT_VALID_P. */ | |
1681 | |
1682 int | |
1683 mmix_print_operand_punct_valid_p (int code ATTRIBUTE_UNUSED) | |
1684 { | |
1685 /* A '+' is used for branch prediction, similar to other ports. */ | |
1686 return code == '+' | |
1687 /* A '.' is used for the %d in the POP %d,0 return insn. */ | |
1688 || code == '.'; | |
1689 } | |
1690 | |
1691 /* PRINT_OPERAND_ADDRESS. */ | |
1692 | |
1693 void | |
1694 mmix_print_operand_address (FILE *stream, rtx x) | |
1695 { | |
1696 if (REG_P (x)) | |
1697 { | |
1698 /* I find the generated assembly code harder to read without | |
1699 the ",0". */ | |
1700 fprintf (stream, "%s,0", reg_names[MMIX_OUTPUT_REGNO (REGNO (x))]); | |
1701 return; | |
1702 } | |
1703 else if (GET_CODE (x) == PLUS) | |
1704 { | |
1705 rtx x1 = XEXP (x, 0); | |
1706 rtx x2 = XEXP (x, 1); | |
1707 | |
1708 if (REG_P (x1)) | |
1709 { | |
1710 fprintf (stream, "%s,", reg_names[MMIX_OUTPUT_REGNO (REGNO (x1))]); | |
1711 | |
1712 if (REG_P (x2)) | |
1713 { | |
1714 fprintf (stream, "%s", | |
1715 reg_names[MMIX_OUTPUT_REGNO (REGNO (x2))]); | |
1716 return; | |
1717 } | |
1718 else if (GET_CODE (x2) == CONST_INT | |
1719 && CONST_OK_FOR_LETTER_P (INTVAL (x2), 'I')) | |
1720 { | |
1721 output_addr_const (stream, x2); | |
1722 return; | |
1723 } | |
1724 } | |
1725 } | |
1726 | |
1727 if (TARGET_BASE_ADDRESSES && mmix_legitimate_constant_p (x)) | |
1728 { | |
1729 output_addr_const (stream, x); | |
1730 return; | |
1731 } | |
1732 | |
1733 fatal_insn ("MMIX Internal: This is not a recognized address", x); | |
1734 } | |
1735 | |
1736 /* ASM_OUTPUT_REG_PUSH. */ | |
1737 | |
1738 void | |
1739 mmix_asm_output_reg_push (FILE *stream, int regno) | |
1740 { | |
1741 fprintf (stream, "\tSUBU %s,%s,8\n\tSTOU %s,%s,0\n", | |
1742 reg_names[MMIX_STACK_POINTER_REGNUM], | |
1743 reg_names[MMIX_STACK_POINTER_REGNUM], | |
1744 reg_names[MMIX_OUTPUT_REGNO (regno)], | |
1745 reg_names[MMIX_STACK_POINTER_REGNUM]); | |
1746 } | |
1747 | |
1748 /* ASM_OUTPUT_REG_POP. */ | |
1749 | |
1750 void | |
1751 mmix_asm_output_reg_pop (FILE *stream, int regno) | |
1752 { | |
1753 fprintf (stream, "\tLDOU %s,%s,0\n\tINCL %s,8\n", | |
1754 reg_names[MMIX_OUTPUT_REGNO (regno)], | |
1755 reg_names[MMIX_STACK_POINTER_REGNUM], | |
1756 reg_names[MMIX_STACK_POINTER_REGNUM]); | |
1757 } | |
1758 | |
1759 /* ASM_OUTPUT_ADDR_DIFF_ELT. */ | |
1760 | |
1761 void | |
1762 mmix_asm_output_addr_diff_elt (FILE *stream, | |
1763 rtx body ATTRIBUTE_UNUSED, | |
1764 int value, | |
1765 int rel) | |
1766 { | |
1767 fprintf (stream, "\tTETRA L%d-L%d\n", value, rel); | |
1768 } | |
1769 | |
1770 /* ASM_OUTPUT_ADDR_VEC_ELT. */ | |
1771 | |
1772 void | |
1773 mmix_asm_output_addr_vec_elt (FILE *stream, int value) | |
1774 { | |
1775 fprintf (stream, "\tOCTA L:%d\n", value); | |
1776 } | |
1777 | |
1778 /* ASM_OUTPUT_SKIP. */ | |
1779 | |
1780 void | |
1781 mmix_asm_output_skip (FILE *stream, int nbytes) | |
1782 { | |
1783 fprintf (stream, "\tLOC @+%d\n", nbytes); | |
1784 } | |
1785 | |
1786 /* ASM_OUTPUT_ALIGN. */ | |
1787 | |
1788 void | |
1789 mmix_asm_output_align (FILE *stream, int power) | |
1790 { | |
1791 /* We need to record the needed alignment of this section in the object, | |
1792 so we have to output an alignment directive. Use a .p2align (not | |
1793 .align) so people will never have to wonder about whether the | |
1794 argument is in number of bytes or the log2 thereof. We do it in | |
1795 addition to the LOC directive, so nothing needs tweaking when | |
1796 copy-pasting assembly into mmixal. */ | |
1797 fprintf (stream, "\t.p2align %d\n", power); | |
1798 fprintf (stream, "\tLOC @+(%d-@)&%d\n", 1 << power, (1 << power) - 1); | |
1799 } | |
1800 | |
1801 /* DBX_REGISTER_NUMBER. */ | |
1802 | |
1803 int | |
1804 mmix_dbx_register_number (int regno) | |
1805 { | |
1806 /* Adjust the register number to the one it will be output as, dammit. | |
1807 It'd be nice if we could check the assumption that we're filling a | |
1808 gap, but every register between the last saved register and parameter | |
1809 registers might be a valid parameter register. */ | |
1810 regno = MMIX_OUTPUT_REGNO (regno); | |
1811 | |
1812 /* We need to renumber registers to get the number of the return address | |
1813 register in the range 0..255. It is also space-saving if registers | |
1814 mentioned in the call-frame information (which uses this function by | |
1815 defaulting DWARF_FRAME_REGNUM to DBX_REGISTER_NUMBER) are numbered | |
1816 0 .. 63. So map 224 .. 256+15 -> 0 .. 47 and 0 .. 223 -> 48..223+48. */ | |
1817 return regno >= 224 ? (regno - 224) : (regno + 48); | |
1818 } | |
1819 | |
1820 /* End of target macro support functions. | |
1821 | |
1822 Now the MMIX port's own functions. First the exported ones. */ | |
1823 | |
1824 /* Wrapper for get_hard_reg_initial_val since integrate.h isn't included | |
1825 from insn-emit.c. */ | |
1826 | |
1827 rtx | |
1828 mmix_get_hard_reg_initial_val (enum machine_mode mode, int regno) | |
1829 { | |
1830 return get_hard_reg_initial_val (mode, regno); | |
1831 } | |
1832 | |
1833 /* Nonzero when the function epilogue is simple enough that a single | |
1834 "POP %d,0" should be used even within the function. */ | |
1835 | |
1836 int | |
1837 mmix_use_simple_return (void) | |
1838 { | |
1839 int regno; | |
1840 | |
1841 int stack_space_to_allocate | |
1842 = (crtl->outgoing_args_size | |
1843 + crtl->args.pretend_args_size | |
1844 + get_frame_size () + 7) & ~7; | |
1845 | |
1846 if (!TARGET_USE_RETURN_INSN || !reload_completed) | |
1847 return 0; | |
1848 | |
1849 for (regno = 255; | |
1850 regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
1851 regno--) | |
1852 /* Note that we assume that the frame-pointer-register is one of these | |
1853 registers, in which case we don't count it here. */ | |
1854 if ((((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
1855 && df_regs_ever_live_p (regno) && !call_used_regs[regno])) | |
1856 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
1857 return 0; | |
1858 | |
1859 if (frame_pointer_needed) | |
1860 stack_space_to_allocate += 8; | |
1861 | |
1862 if (MMIX_CFUN_HAS_LANDING_PAD) | |
1863 stack_space_to_allocate += 16; | |
1864 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
1865 stack_space_to_allocate += 8; | |
1866 | |
1867 return stack_space_to_allocate == 0; | |
1868 } | |
1869 | |
1870 | |
1871 /* Expands the function prologue into RTX. */ | |
1872 | |
1873 void | |
1874 mmix_expand_prologue (void) | |
1875 { | |
1876 HOST_WIDE_INT locals_size = get_frame_size (); | |
1877 int regno; | |
1878 HOST_WIDE_INT stack_space_to_allocate | |
1879 = (crtl->outgoing_args_size | |
1880 + crtl->args.pretend_args_size | |
1881 + locals_size + 7) & ~7; | |
1882 HOST_WIDE_INT offset = -8; | |
1883 | |
1884 /* Add room needed to save global non-register-stack registers. */ | |
1885 for (regno = 255; | |
1886 regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
1887 regno--) | |
1888 /* Note that we assume that the frame-pointer-register is one of these | |
1889 registers, in which case we don't count it here. */ | |
1890 if ((((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
1891 && df_regs_ever_live_p (regno) && !call_used_regs[regno])) | |
1892 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
1893 stack_space_to_allocate += 8; | |
1894 | |
1895 /* If we do have a frame-pointer, add room for it. */ | |
1896 if (frame_pointer_needed) | |
1897 stack_space_to_allocate += 8; | |
1898 | |
1899 /* If we have a non-local label, we need to be able to unwind to it, so | |
1900 store the current register stack pointer. Also store the return | |
1901 address if we do that. */ | |
1902 if (MMIX_CFUN_HAS_LANDING_PAD) | |
1903 stack_space_to_allocate += 16; | |
1904 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
1905 /* If we do have a saved return-address slot, add room for it. */ | |
1906 stack_space_to_allocate += 8; | |
1907 | |
1908 /* Make sure we don't get an unaligned stack. */ | |
1909 if ((stack_space_to_allocate % 8) != 0) | |
1910 internal_error ("stack frame not a multiple of 8 bytes: %wd", | |
1911 stack_space_to_allocate); | |
1912 | |
1913 if (crtl->args.pretend_args_size) | |
1914 { | |
1915 int mmix_first_vararg_reg | |
1916 = (MMIX_FIRST_INCOMING_ARG_REGNUM | |
1917 + (MMIX_MAX_ARGS_IN_REGS | |
1918 - crtl->args.pretend_args_size / 8)); | |
1919 | |
1920 for (regno | |
1921 = MMIX_FIRST_INCOMING_ARG_REGNUM + MMIX_MAX_ARGS_IN_REGS - 1; | |
1922 regno >= mmix_first_vararg_reg; | |
1923 regno--) | |
1924 { | |
1925 if (offset < 0) | |
1926 { | |
1927 HOST_WIDE_INT stack_chunk | |
1928 = stack_space_to_allocate > (256 - 8) | |
1929 ? (256 - 8) : stack_space_to_allocate; | |
1930 | |
1931 mmix_emit_sp_add (-stack_chunk); | |
1932 offset += stack_chunk; | |
1933 stack_space_to_allocate -= stack_chunk; | |
1934 } | |
1935 | |
1936 /* These registers aren't actually saved (as in "will be | |
1937 restored"), so don't tell DWARF2 they're saved. */ | |
1938 emit_move_insn (gen_rtx_MEM (DImode, | |
1939 plus_constant (stack_pointer_rtx, | |
1940 offset)), | |
1941 gen_rtx_REG (DImode, regno)); | |
1942 offset -= 8; | |
1943 } | |
1944 } | |
1945 | |
1946 /* Store the frame-pointer. */ | |
1947 | |
1948 if (frame_pointer_needed) | |
1949 { | |
1950 rtx insn; | |
1951 | |
1952 if (offset < 0) | |
1953 { | |
1954 /* Get 8 less than otherwise, since we need to reach offset + 8. */ | |
1955 HOST_WIDE_INT stack_chunk | |
1956 = stack_space_to_allocate > (256 - 8 - 8) | |
1957 ? (256 - 8 - 8) : stack_space_to_allocate; | |
1958 | |
1959 mmix_emit_sp_add (-stack_chunk); | |
1960 | |
1961 offset += stack_chunk; | |
1962 stack_space_to_allocate -= stack_chunk; | |
1963 } | |
1964 | |
1965 insn = emit_move_insn (gen_rtx_MEM (DImode, | |
1966 plus_constant (stack_pointer_rtx, | |
1967 offset)), | |
1968 hard_frame_pointer_rtx); | |
1969 RTX_FRAME_RELATED_P (insn) = 1; | |
1970 insn = emit_insn (gen_adddi3 (hard_frame_pointer_rtx, | |
1971 stack_pointer_rtx, | |
1972 GEN_INT (offset + 8))); | |
1973 RTX_FRAME_RELATED_P (insn) = 1; | |
1974 offset -= 8; | |
1975 } | |
1976 | |
1977 if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
1978 { | |
1979 rtx tmpreg, retreg; | |
1980 rtx insn; | |
1981 | |
1982 /* Store the return-address, if one is needed on the stack. We | |
1983 usually store it in a register when needed, but that doesn't work | |
1984 with -fexceptions. */ | |
1985 | |
1986 if (offset < 0) | |
1987 { | |
1988 /* Get 8 less than otherwise, since we need to reach offset + 8. */ | |
1989 HOST_WIDE_INT stack_chunk | |
1990 = stack_space_to_allocate > (256 - 8 - 8) | |
1991 ? (256 - 8 - 8) : stack_space_to_allocate; | |
1992 | |
1993 mmix_emit_sp_add (-stack_chunk); | |
1994 | |
1995 offset += stack_chunk; | |
1996 stack_space_to_allocate -= stack_chunk; | |
1997 } | |
1998 | |
1999 tmpreg = gen_rtx_REG (DImode, 255); | |
2000 retreg = gen_rtx_REG (DImode, MMIX_rJ_REGNUM); | |
2001 | |
2002 /* Dwarf2 code is confused by the use of a temporary register for | |
2003 storing the return address, so we have to express it as a note, | |
2004 which we attach to the actual store insn. */ | |
2005 emit_move_insn (tmpreg, retreg); | |
2006 | |
2007 insn = emit_move_insn (gen_rtx_MEM (DImode, | |
2008 plus_constant (stack_pointer_rtx, | |
2009 offset)), | |
2010 tmpreg); | |
2011 RTX_FRAME_RELATED_P (insn) = 1; | |
2012 REG_NOTES (insn) | |
2013 = gen_rtx_EXPR_LIST (REG_FRAME_RELATED_EXPR, | |
2014 gen_rtx_SET (VOIDmode, | |
2015 gen_rtx_MEM (DImode, | |
2016 plus_constant (stack_pointer_rtx, | |
2017 offset)), | |
2018 retreg), | |
2019 REG_NOTES (insn)); | |
2020 | |
2021 offset -= 8; | |
2022 } | |
2023 else if (MMIX_CFUN_HAS_LANDING_PAD) | |
2024 offset -= 8; | |
2025 | |
2026 if (MMIX_CFUN_HAS_LANDING_PAD) | |
2027 { | |
2028 /* Store the register defining the numbering of local registers, so | |
2029 we know how long to unwind the register stack. */ | |
2030 | |
2031 if (offset < 0) | |
2032 { | |
2033 /* Get 8 less than otherwise, since we need to reach offset + 8. */ | |
2034 HOST_WIDE_INT stack_chunk | |
2035 = stack_space_to_allocate > (256 - 8 - 8) | |
2036 ? (256 - 8 - 8) : stack_space_to_allocate; | |
2037 | |
2038 mmix_emit_sp_add (-stack_chunk); | |
2039 | |
2040 offset += stack_chunk; | |
2041 stack_space_to_allocate -= stack_chunk; | |
2042 } | |
2043 | |
2044 /* We don't tell dwarf2 about this one; we just have it to unwind | |
2045 the register stack at landing pads. FIXME: It's a kludge because | |
2046 we can't describe the effect of the PUSHJ and PUSHGO insns on the | |
2047 register stack at the moment. Best thing would be to handle it | |
2048 like stack-pointer offsets. Better: some hook into dwarf2out.c | |
2049 to produce DW_CFA_expression:s that specify the increment of rO, | |
2050 and unwind it at eh_return (preferred) or at the landing pad. | |
2051 Then saves to $0..$G-1 could be specified through that register. */ | |
2052 | |
2053 emit_move_insn (gen_rtx_REG (DImode, 255), | |
2054 gen_rtx_REG (DImode, | |
2055 MMIX_rO_REGNUM)); | |
2056 emit_move_insn (gen_rtx_MEM (DImode, | |
2057 plus_constant (stack_pointer_rtx, offset)), | |
2058 gen_rtx_REG (DImode, 255)); | |
2059 offset -= 8; | |
2060 } | |
2061 | |
2062 /* After the return-address and the frame-pointer, we have the local | |
2063 variables. They're the ones that may have an "unaligned" size. */ | |
2064 offset -= (locals_size + 7) & ~7; | |
2065 | |
2066 /* Now store all registers that are global, i.e. not saved by the | |
2067 register file machinery. | |
2068 | |
2069 It is assumed that the frame-pointer is one of these registers, so it | |
2070 is explicitly excluded in the count. */ | |
2071 | |
2072 for (regno = 255; | |
2073 regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
2074 regno--) | |
2075 if (((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
2076 && df_regs_ever_live_p (regno) && ! call_used_regs[regno]) | |
2077 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
2078 { | |
2079 rtx insn; | |
2080 | |
2081 if (offset < 0) | |
2082 { | |
2083 HOST_WIDE_INT stack_chunk | |
2084 = (stack_space_to_allocate > (256 - offset - 8) | |
2085 ? (256 - offset - 8) : stack_space_to_allocate); | |
2086 | |
2087 mmix_emit_sp_add (-stack_chunk); | |
2088 offset += stack_chunk; | |
2089 stack_space_to_allocate -= stack_chunk; | |
2090 } | |
2091 | |
2092 insn = emit_move_insn (gen_rtx_MEM (DImode, | |
2093 plus_constant (stack_pointer_rtx, | |
2094 offset)), | |
2095 gen_rtx_REG (DImode, regno)); | |
2096 RTX_FRAME_RELATED_P (insn) = 1; | |
2097 offset -= 8; | |
2098 } | |
2099 | |
2100 /* Finally, allocate room for outgoing args and local vars if room | |
2101 wasn't allocated above. */ | |
2102 if (stack_space_to_allocate) | |
2103 mmix_emit_sp_add (-stack_space_to_allocate); | |
2104 } | |
2105 | |
2106 /* Expands the function epilogue into RTX. */ | |
2107 | |
2108 void | |
2109 mmix_expand_epilogue (void) | |
2110 { | |
2111 HOST_WIDE_INT locals_size = get_frame_size (); | |
2112 int regno; | |
2113 HOST_WIDE_INT stack_space_to_deallocate | |
2114 = (crtl->outgoing_args_size | |
2115 + crtl->args.pretend_args_size | |
2116 + locals_size + 7) & ~7; | |
2117 | |
2118 /* The first address to access is beyond the outgoing_args area. */ | |
2119 HOST_WIDE_INT offset = crtl->outgoing_args_size; | |
2120 | |
2121 /* Add the space for global non-register-stack registers. | |
2122 It is assumed that the frame-pointer register can be one of these | |
2123 registers, in which case it is excluded from the count when needed. */ | |
2124 for (regno = 255; | |
2125 regno >= MMIX_FIRST_GLOBAL_REGNUM; | |
2126 regno--) | |
2127 if (((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
2128 && df_regs_ever_live_p (regno) && !call_used_regs[regno]) | |
2129 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
2130 stack_space_to_deallocate += 8; | |
2131 | |
2132 /* Add in the space for register stack-pointer. If so, always add room | |
2133 for the saved PC. */ | |
2134 if (MMIX_CFUN_HAS_LANDING_PAD) | |
2135 stack_space_to_deallocate += 16; | |
2136 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
2137 /* If we have a saved return-address slot, add it in. */ | |
2138 stack_space_to_deallocate += 8; | |
2139 | |
2140 /* Add in the frame-pointer. */ | |
2141 if (frame_pointer_needed) | |
2142 stack_space_to_deallocate += 8; | |
2143 | |
2144 /* Make sure we don't get an unaligned stack. */ | |
2145 if ((stack_space_to_deallocate % 8) != 0) | |
2146 internal_error ("stack frame not a multiple of octabyte: %wd", | |
2147 stack_space_to_deallocate); | |
2148 | |
2149 /* We will add back small offsets to the stack pointer as we go. | |
2150 First, we restore all registers that are global, i.e. not saved by | |
2151 the register file machinery. */ | |
2152 | |
2153 for (regno = MMIX_FIRST_GLOBAL_REGNUM; | |
2154 regno <= 255; | |
2155 regno++) | |
2156 if (((regno != MMIX_FRAME_POINTER_REGNUM || !frame_pointer_needed) | |
2157 && df_regs_ever_live_p (regno) && !call_used_regs[regno]) | |
2158 || IS_MMIX_EH_RETURN_DATA_REG (regno)) | |
2159 { | |
2160 if (offset > 255) | |
2161 { | |
2162 mmix_emit_sp_add (offset); | |
2163 stack_space_to_deallocate -= offset; | |
2164 offset = 0; | |
2165 } | |
2166 | |
2167 emit_move_insn (gen_rtx_REG (DImode, regno), | |
2168 gen_rtx_MEM (DImode, | |
2169 plus_constant (stack_pointer_rtx, | |
2170 offset))); | |
2171 offset += 8; | |
2172 } | |
2173 | |
2174 /* Here is where the local variables were. As in the prologue, they | |
2175 might be of an unaligned size. */ | |
2176 offset += (locals_size + 7) & ~7; | |
2177 | |
2178 /* The saved register stack pointer is just below the frame-pointer | |
2179 register. We don't need to restore it "manually"; the POP | |
2180 instruction does that. */ | |
2181 if (MMIX_CFUN_HAS_LANDING_PAD) | |
2182 offset += 16; | |
2183 else if (MMIX_CFUN_NEEDS_SAVED_EH_RETURN_ADDRESS) | |
2184 /* The return-address slot is just below the frame-pointer register. | |
2185 We don't need to restore it because we don't really use it. */ | |
2186 offset += 8; | |
2187 | |
2188 /* Get back the old frame-pointer-value. */ | |
2189 if (frame_pointer_needed) | |
2190 { | |
2191 if (offset > 255) | |
2192 { | |
2193 mmix_emit_sp_add (offset); | |
2194 | |
2195 stack_space_to_deallocate -= offset; | |
2196 offset = 0; | |
2197 } | |
2198 | |
2199 emit_move_insn (hard_frame_pointer_rtx, | |
2200 gen_rtx_MEM (DImode, | |
2201 plus_constant (stack_pointer_rtx, | |
2202 offset))); | |
2203 offset += 8; | |
2204 } | |
2205 | |
2206 /* We do not need to restore pretended incoming args, just add back | |
2207 offset to sp. */ | |
2208 if (stack_space_to_deallocate != 0) | |
2209 mmix_emit_sp_add (stack_space_to_deallocate); | |
2210 | |
2211 if (crtl->calls_eh_return) | |
2212 /* Adjust the (normal) stack-pointer to that of the receiver. | |
2213 FIXME: It would be nice if we could also adjust the register stack | |
2214 here, but we need to express it through DWARF 2 too. */ | |
2215 emit_insn (gen_adddi3 (stack_pointer_rtx, stack_pointer_rtx, | |
2216 gen_rtx_REG (DImode, | |
2217 MMIX_EH_RETURN_STACKADJ_REGNUM))); | |
2218 } | |
2219 | |
2220 /* Output an optimal sequence for setting a register to a specific | |
2221 constant. Used in an alternative for const_ints in movdi, and when | |
2222 using large stack-frame offsets. | |
2223 | |
2224 Use do_begin_end to say if a line-starting TAB and newline before the | |
2225 first insn and after the last insn is wanted. */ | |
2226 | |
2227 void | |
2228 mmix_output_register_setting (FILE *stream, | |
2229 int regno, | |
2230 HOST_WIDEST_INT value, | |
2231 int do_begin_end) | |
2232 { | |
2233 if (do_begin_end) | |
2234 fprintf (stream, "\t"); | |
2235 | |
2236 if (mmix_shiftable_wyde_value ((unsigned HOST_WIDEST_INT) value)) | |
2237 { | |
2238 /* First, the one-insn cases. */ | |
2239 mmix_output_shiftvalue_op_from_str (stream, "SET", | |
2240 (unsigned HOST_WIDEST_INT) | |
2241 value); | |
2242 fprintf (stream, " %s,", reg_names[regno]); | |
2243 mmix_output_shifted_value (stream, (unsigned HOST_WIDEST_INT) value); | |
2244 } | |
2245 else if (mmix_shiftable_wyde_value (-(unsigned HOST_WIDEST_INT) value)) | |
2246 { | |
2247 /* We do this to get a bit more legible assembly code. The next | |
2248 alternative is mostly redundant with this. */ | |
2249 | |
2250 mmix_output_shiftvalue_op_from_str (stream, "SET", | |
2251 -(unsigned HOST_WIDEST_INT) | |
2252 value); | |
2253 fprintf (stream, " %s,", reg_names[regno]); | |
2254 mmix_output_shifted_value (stream, -(unsigned HOST_WIDEST_INT) value); | |
2255 fprintf (stream, "\n\tNEGU %s,0,%s", reg_names[regno], | |
2256 reg_names[regno]); | |
2257 } | |
2258 else if (mmix_shiftable_wyde_value (~(unsigned HOST_WIDEST_INT) value)) | |
2259 { | |
2260 /* Slightly more expensive, the two-insn cases. */ | |
2261 | |
2262 /* FIXME: We could of course also test if 0..255-N or ~(N | 1..255) | |
2263 is shiftable, or any other one-insn transformation of the value. | |
2264 FIXME: Check first if the value is "shiftable" by two loading | |
2265 with two insns, since it makes more readable assembly code (if | |
2266 anyone else cares). */ | |
2267 | |
2268 mmix_output_shiftvalue_op_from_str (stream, "SET", | |
2269 ~(unsigned HOST_WIDEST_INT) | |
2270 value); | |
2271 fprintf (stream, " %s,", reg_names[regno]); | |
2272 mmix_output_shifted_value (stream, ~(unsigned HOST_WIDEST_INT) value); | |
2273 fprintf (stream, "\n\tNOR %s,%s,0", reg_names[regno], | |
2274 reg_names[regno]); | |
2275 } | |
2276 else | |
2277 { | |
2278 /* The generic case. 2..4 insns. */ | |
2279 static const char *const higher_parts[] = {"L", "ML", "MH", "H"}; | |
2280 const char *op = "SET"; | |
2281 const char *line_begin = ""; | |
2282 int insns = 0; | |
2283 int i; | |
2284 HOST_WIDEST_INT tmpvalue = value; | |
2285 | |
2286 /* Compute the number of insns needed to output this constant. */ | |
2287 for (i = 0; i < 4 && tmpvalue != 0; i++) | |
2288 { | |
2289 if (tmpvalue & 65535) | |
2290 insns++; | |
2291 tmpvalue >>= 16; | |
2292 } | |
2293 if (TARGET_BASE_ADDRESSES && insns == 3) | |
2294 { | |
2295 /* The number three is based on a static observation on | |
2296 ghostscript-6.52. Two and four are excluded because there | |
2297 are too many such constants, and each unique constant (maybe | |
2298 offset by 1..255) were used few times compared to other uses, | |
2299 e.g. addresses. | |
2300 | |
2301 We use base-plus-offset addressing to force it into a global | |
2302 register; we just use a "LDA reg,VALUE", which will cause the | |
2303 assembler and linker to DTRT (for constants as well as | |
2304 addresses). */ | |
2305 fprintf (stream, "LDA %s,", reg_names[regno]); | |
2306 mmix_output_octa (stream, value, 0); | |
2307 } | |
2308 else | |
2309 { | |
2310 /* Output pertinent parts of the 4-wyde sequence. | |
2311 Still more to do if we want this to be optimal, but hey... | |
2312 Note that the zero case has been handled above. */ | |
2313 for (i = 0; i < 4 && value != 0; i++) | |
2314 { | |
2315 if (value & 65535) | |
2316 { | |
2317 fprintf (stream, "%s%s%s %s,#%x", line_begin, op, | |
2318 higher_parts[i], reg_names[regno], | |
2319 (int) (value & 65535)); | |
2320 /* The first one sets the rest of the bits to 0, the next | |
2321 ones add set bits. */ | |
2322 op = "INC"; | |
2323 line_begin = "\n\t"; | |
2324 } | |
2325 | |
2326 value >>= 16; | |
2327 } | |
2328 } | |
2329 } | |
2330 | |
2331 if (do_begin_end) | |
2332 fprintf (stream, "\n"); | |
2333 } | |
2334 | |
2335 /* Return 1 if value is 0..65535*2**(16*N) for N=0..3. | |
2336 else return 0. */ | |
2337 | |
2338 int | |
2339 mmix_shiftable_wyde_value (unsigned HOST_WIDEST_INT value) | |
2340 { | |
2341 /* Shift by 16 bits per group, stop when we've found two groups with | |
2342 nonzero bits. */ | |
2343 int i; | |
2344 int has_candidate = 0; | |
2345 | |
2346 for (i = 0; i < 4; i++) | |
2347 { | |
2348 if (value & 65535) | |
2349 { | |
2350 if (has_candidate) | |
2351 return 0; | |
2352 else | |
2353 has_candidate = 1; | |
2354 } | |
2355 | |
2356 value >>= 16; | |
2357 } | |
2358 | |
2359 return 1; | |
2360 } | |
2361 | |
2362 /* Returns zero if code and mode is not a valid condition from a | |
2363 compare-type insn. Nonzero if it is. The parameter op, if non-NULL, | |
2364 is the comparison of mode is CC-somethingmode. */ | |
2365 | |
2366 int | |
2367 mmix_valid_comparison (RTX_CODE code, enum machine_mode mode, rtx op) | |
2368 { | |
2369 if (mode == VOIDmode && op != NULL_RTX) | |
2370 mode = GET_MODE (op); | |
2371 | |
2372 /* We don't care to look at these, they should always be valid. */ | |
2373 if (mode == CCmode || mode == CC_UNSmode || mode == DImode) | |
2374 return 1; | |
2375 | |
2376 if ((mode == CC_FPmode || mode == DFmode) | |
2377 && (code == GT || code == LT)) | |
2378 return 1; | |
2379 | |
2380 if ((mode == CC_FPEQmode || mode == DFmode) | |
2381 && (code == EQ || code == NE)) | |
2382 return 1; | |
2383 | |
2384 if ((mode == CC_FUNmode || mode == DFmode) | |
2385 && (code == ORDERED || code == UNORDERED)) | |
2386 return 1; | |
2387 | |
2388 return 0; | |
2389 } | |
2390 | |
2391 /* X and Y are two things to compare using CODE. Emit a compare insn if | |
2392 possible and return the rtx for the cc-reg in the proper mode, or | |
2393 NULL_RTX if this is not a valid comparison. */ | |
2394 | |
2395 rtx | |
2396 mmix_gen_compare_reg (RTX_CODE code, rtx x, rtx y) | |
2397 { | |
2398 enum machine_mode ccmode = SELECT_CC_MODE (code, x, y); | |
2399 rtx cc_reg; | |
2400 | |
2401 /* FIXME: Do we get constants here? Of double mode? */ | |
2402 enum machine_mode mode | |
2403 = GET_MODE (x) == VOIDmode | |
2404 ? GET_MODE (y) | |
2405 : GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT ? DFmode : DImode; | |
2406 | |
2407 if (! mmix_valid_comparison (code, mode, x)) | |
2408 return NULL_RTX; | |
2409 | |
2410 cc_reg = gen_reg_rtx (ccmode); | |
2411 | |
2412 /* FIXME: Can we avoid emitting a compare insn here? */ | |
2413 if (! REG_P (x) && ! REG_P (y)) | |
2414 x = force_reg (mode, x); | |
2415 | |
2416 /* If it's not quite right yet, put y in a register. */ | |
2417 if (! REG_P (y) | |
2418 && (GET_CODE (y) != CONST_INT | |
2419 || ! CONST_OK_FOR_LETTER_P (INTVAL (y), 'I'))) | |
2420 y = force_reg (mode, y); | |
2421 | |
2422 emit_insn (gen_rtx_SET (VOIDmode, cc_reg, | |
2423 gen_rtx_COMPARE (ccmode, x, y))); | |
2424 | |
2425 return cc_reg; | |
2426 } | |
2427 | |
2428 /* Local (static) helper functions. */ | |
2429 | |
2430 static void | |
2431 mmix_emit_sp_add (HOST_WIDE_INT offset) | |
2432 { | |
2433 rtx insn; | |
2434 | |
2435 if (offset < 0) | |
2436 { | |
2437 /* Negative stack-pointer adjustments are allocations and appear in | |
2438 the prologue only. We mark them as frame-related so unwind and | |
2439 debug info is properly emitted for them. */ | |
2440 if (offset > -255) | |
2441 insn = emit_insn (gen_adddi3 (stack_pointer_rtx, | |
2442 stack_pointer_rtx, | |
2443 GEN_INT (offset))); | |
2444 else | |
2445 { | |
2446 rtx tmpr = gen_rtx_REG (DImode, 255); | |
2447 RTX_FRAME_RELATED_P (emit_move_insn (tmpr, GEN_INT (offset))) = 1; | |
2448 insn = emit_insn (gen_adddi3 (stack_pointer_rtx, | |
2449 stack_pointer_rtx, tmpr)); | |
2450 } | |
2451 RTX_FRAME_RELATED_P (insn) = 1; | |
2452 } | |
2453 else | |
2454 { | |
2455 /* Positive adjustments are in the epilogue only. Don't mark them | |
2456 as "frame-related" for unwind info. */ | |
2457 if (CONST_OK_FOR_LETTER_P (offset, 'L')) | |
2458 emit_insn (gen_adddi3 (stack_pointer_rtx, | |
2459 stack_pointer_rtx, | |
2460 GEN_INT (offset))); | |
2461 else | |
2462 { | |
2463 rtx tmpr = gen_rtx_REG (DImode, 255); | |
2464 emit_move_insn (tmpr, GEN_INT (offset)); | |
2465 insn = emit_insn (gen_adddi3 (stack_pointer_rtx, | |
2466 stack_pointer_rtx, tmpr)); | |
2467 } | |
2468 } | |
2469 } | |
2470 | |
2471 /* Print operator suitable for doing something with a shiftable | |
2472 wyde. The type of operator is passed as an asm output modifier. */ | |
2473 | |
2474 static void | |
2475 mmix_output_shiftvalue_op_from_str (FILE *stream, | |
2476 const char *mainop, | |
2477 HOST_WIDEST_INT value) | |
2478 { | |
2479 static const char *const op_part[] = {"L", "ML", "MH", "H"}; | |
2480 int i; | |
2481 | |
2482 if (! mmix_shiftable_wyde_value (value)) | |
2483 { | |
2484 char s[sizeof ("0xffffffffffffffff")]; | |
2485 sprintf (s, HOST_WIDEST_INT_PRINT_HEX, value); | |
2486 internal_error ("MMIX Internal: %s is not a shiftable int", s); | |
2487 } | |
2488 | |
2489 for (i = 0; i < 4; i++) | |
2490 { | |
2491 /* We know we're through when we find one-bits in the low | |
2492 16 bits. */ | |
2493 if (value & 0xffff) | |
2494 { | |
2495 fprintf (stream, "%s%s", mainop, op_part[i]); | |
2496 return; | |
2497 } | |
2498 value >>= 16; | |
2499 } | |
2500 | |
2501 /* No bits set? Then it must have been zero. */ | |
2502 fprintf (stream, "%sL", mainop); | |
2503 } | |
2504 | |
2505 /* Print a 64-bit value, optionally prefixed by assembly pseudo. */ | |
2506 | |
2507 static void | |
2508 mmix_output_octa (FILE *stream, HOST_WIDEST_INT value, int do_begin_end) | |
2509 { | |
2510 /* Snipped from final.c:output_addr_const. We need to avoid the | |
2511 presumed universal "0x" prefix. We can do it by replacing "0x" with | |
2512 "#0" here; we must avoid a space in the operands and no, the zero | |
2513 won't cause the number to be assumed in octal format. */ | |
2514 char hex_format[sizeof (HOST_WIDEST_INT_PRINT_HEX)]; | |
2515 | |
2516 if (do_begin_end) | |
2517 fprintf (stream, "\tOCTA "); | |
2518 | |
2519 strcpy (hex_format, HOST_WIDEST_INT_PRINT_HEX); | |
2520 hex_format[0] = '#'; | |
2521 hex_format[1] = '0'; | |
2522 | |
2523 /* Provide a few alternative output formats depending on the number, to | |
2524 improve legibility of assembler output. */ | |
2525 if ((value < (HOST_WIDEST_INT) 0 && value > (HOST_WIDEST_INT) -10000) | |
2526 || (value >= (HOST_WIDEST_INT) 0 && value <= (HOST_WIDEST_INT) 16384)) | |
2527 fprintf (stream, "%d", (int) value); | |
2528 else if (value > (HOST_WIDEST_INT) 0 | |
2529 && value < ((HOST_WIDEST_INT) 1 << 31) * 2) | |
2530 fprintf (stream, "#%x", (unsigned int) value); | |
2531 else | |
2532 fprintf (stream, hex_format, value); | |
2533 | |
2534 if (do_begin_end) | |
2535 fprintf (stream, "\n"); | |
2536 } | |
2537 | |
2538 /* Print the presumed shiftable wyde argument shifted into place (to | |
2539 be output with an operand). */ | |
2540 | |
2541 static void | |
2542 mmix_output_shifted_value (FILE *stream, HOST_WIDEST_INT value) | |
2543 { | |
2544 int i; | |
2545 | |
2546 if (! mmix_shiftable_wyde_value (value)) | |
2547 { | |
2548 char s[16+2+1]; | |
2549 sprintf (s, HOST_WIDEST_INT_PRINT_HEX, value); | |
2550 internal_error ("MMIX Internal: %s is not a shiftable int", s); | |
2551 } | |
2552 | |
2553 for (i = 0; i < 4; i++) | |
2554 { | |
2555 /* We know we're through when we find one-bits in the low 16 bits. */ | |
2556 if (value & 0xffff) | |
2557 { | |
2558 fprintf (stream, "#%x", (int) (value & 0xffff)); | |
2559 return; | |
2560 } | |
2561 | |
2562 value >>= 16; | |
2563 } | |
2564 | |
2565 /* No bits set? Then it must have been zero. */ | |
2566 fprintf (stream, "0"); | |
2567 } | |
2568 | |
2569 /* Output an MMIX condition name corresponding to an operator | |
2570 and operands: | |
2571 (comparison_operator [(comparison_operator ...) (const_int 0)]) | |
2572 which means we have to look at *two* operators. | |
2573 | |
2574 The argument "reversed" refers to reversal of the condition (not the | |
2575 same as swapping the arguments). */ | |
2576 | |
2577 static void | |
2578 mmix_output_condition (FILE *stream, rtx x, int reversed) | |
2579 { | |
2580 struct cc_conv | |
2581 { | |
2582 RTX_CODE cc; | |
2583 | |
2584 /* The normal output cc-code. */ | |
2585 const char *const normal; | |
2586 | |
2587 /* The reversed cc-code, or NULL if invalid. */ | |
2588 const char *const reversed; | |
2589 }; | |
2590 | |
2591 struct cc_type_conv | |
2592 { | |
2593 enum machine_mode cc_mode; | |
2594 | |
2595 /* Terminated with {UNKNOWN, NULL, NULL} */ | |
2596 const struct cc_conv *const convs; | |
2597 }; | |
2598 | |
2599 #undef CCEND | |
2600 #define CCEND {UNKNOWN, NULL, NULL} | |
2601 | |
2602 static const struct cc_conv cc_fun_convs[] | |
2603 = {{ORDERED, "Z", "P"}, | |
2604 {UNORDERED, "P", "Z"}, | |
2605 CCEND}; | |
2606 static const struct cc_conv cc_fp_convs[] | |
2607 = {{GT, "P", NULL}, | |
2608 {LT, "N", NULL}, | |
2609 CCEND}; | |
2610 static const struct cc_conv cc_fpeq_convs[] | |
2611 = {{NE, "Z", "P"}, | |
2612 {EQ, "P", "Z"}, | |
2613 CCEND}; | |
2614 static const struct cc_conv cc_uns_convs[] | |
2615 = {{GEU, "NN", "N"}, | |
2616 {GTU, "P", "NP"}, | |
2617 {LEU, "NP", "P"}, | |
2618 {LTU, "N", "NN"}, | |
2619 CCEND}; | |
2620 static const struct cc_conv cc_signed_convs[] | |
2621 = {{NE, "NZ", "Z"}, | |
2622 {EQ, "Z", "NZ"}, | |
2623 {GE, "NN", "N"}, | |
2624 {GT, "P", "NP"}, | |
2625 {LE, "NP", "P"}, | |
2626 {LT, "N", "NN"}, | |
2627 CCEND}; | |
2628 static const struct cc_conv cc_di_convs[] | |
2629 = {{NE, "NZ", "Z"}, | |
2630 {EQ, "Z", "NZ"}, | |
2631 {GE, "NN", "N"}, | |
2632 {GT, "P", "NP"}, | |
2633 {LE, "NP", "P"}, | |
2634 {LT, "N", "NN"}, | |
2635 {GTU, "NZ", "Z"}, | |
2636 {LEU, "Z", "NZ"}, | |
2637 CCEND}; | |
2638 #undef CCEND | |
2639 | |
2640 static const struct cc_type_conv cc_convs[] | |
2641 = {{CC_FUNmode, cc_fun_convs}, | |
2642 {CC_FPmode, cc_fp_convs}, | |
2643 {CC_FPEQmode, cc_fpeq_convs}, | |
2644 {CC_UNSmode, cc_uns_convs}, | |
2645 {CCmode, cc_signed_convs}, | |
2646 {DImode, cc_di_convs}}; | |
2647 | |
2648 size_t i; | |
2649 int j; | |
2650 | |
2651 enum machine_mode mode = GET_MODE (XEXP (x, 0)); | |
2652 RTX_CODE cc = GET_CODE (x); | |
2653 | |
2654 for (i = 0; i < ARRAY_SIZE (cc_convs); i++) | |
2655 { | |
2656 if (mode == cc_convs[i].cc_mode) | |
2657 { | |
2658 for (j = 0; cc_convs[i].convs[j].cc != UNKNOWN; j++) | |
2659 if (cc == cc_convs[i].convs[j].cc) | |
2660 { | |
2661 const char *mmix_cc | |
2662 = (reversed ? cc_convs[i].convs[j].reversed | |
2663 : cc_convs[i].convs[j].normal); | |
2664 | |
2665 if (mmix_cc == NULL) | |
2666 fatal_insn ("MMIX Internal: Trying to output invalidly\ | |
2667 reversed condition:", x); | |
2668 | |
2669 fprintf (stream, "%s", mmix_cc); | |
2670 return; | |
2671 } | |
2672 | |
2673 fatal_insn ("MMIX Internal: What's the CC of this?", x); | |
2674 } | |
2675 } | |
2676 | |
2677 fatal_insn ("MMIX Internal: What is the CC of this?", x); | |
2678 } | |
2679 | |
2680 /* Return the bit-value for a const_int or const_double. */ | |
2681 | |
2682 static HOST_WIDEST_INT | |
2683 mmix_intval (rtx x) | |
2684 { | |
2685 unsigned HOST_WIDEST_INT retval; | |
2686 | |
2687 if (GET_CODE (x) == CONST_INT) | |
2688 return INTVAL (x); | |
2689 | |
2690 /* We make a little song and dance because converting to long long in | |
2691 gcc-2.7.2 is broken. I still want people to be able to use it for | |
2692 cross-compilation to MMIX. */ | |
2693 if (GET_CODE (x) == CONST_DOUBLE && GET_MODE (x) == VOIDmode) | |
2694 { | |
2695 if (sizeof (HOST_WIDE_INT) < sizeof (HOST_WIDEST_INT)) | |
2696 { | |
2697 retval = (unsigned) CONST_DOUBLE_LOW (x) / 2; | |
2698 retval *= 2; | |
2699 retval |= CONST_DOUBLE_LOW (x) & 1; | |
2700 | |
2701 retval |= | |
2702 (unsigned HOST_WIDEST_INT) CONST_DOUBLE_HIGH (x) | |
2703 << (HOST_BITS_PER_LONG); | |
2704 } | |
2705 else | |
2706 retval = CONST_DOUBLE_HIGH (x); | |
2707 | |
2708 return retval; | |
2709 } | |
2710 | |
2711 if (GET_CODE (x) == CONST_DOUBLE) | |
2712 { | |
2713 REAL_VALUE_TYPE value; | |
2714 | |
2715 /* FIXME: This macro is not in the manual but should be. */ | |
2716 REAL_VALUE_FROM_CONST_DOUBLE (value, x); | |
2717 | |
2718 if (GET_MODE (x) == DFmode) | |
2719 { | |
2720 long bits[2]; | |
2721 | |
2722 REAL_VALUE_TO_TARGET_DOUBLE (value, bits); | |
2723 | |
2724 /* The double cast is necessary to avoid getting the long | |
2725 sign-extended to unsigned long long(!) when they're of | |
2726 different size (usually 32-bit hosts). */ | |
2727 return | |
2728 ((unsigned HOST_WIDEST_INT) (unsigned long) bits[0] | |
2729 << (unsigned HOST_WIDEST_INT) 32U) | |
2730 | (unsigned HOST_WIDEST_INT) (unsigned long) bits[1]; | |
2731 } | |
2732 else if (GET_MODE (x) == SFmode) | |
2733 { | |
2734 long bits; | |
2735 REAL_VALUE_TO_TARGET_SINGLE (value, bits); | |
2736 | |
2737 return (unsigned long) bits; | |
2738 } | |
2739 } | |
2740 | |
2741 fatal_insn ("MMIX Internal: This is not a constant:", x); | |
2742 } | |
2743 | |
2744 /* Worker function for TARGET_STRUCT_VALUE_RTX. */ | |
2745 | |
2746 static rtx | |
2747 mmix_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED, | |
2748 int incoming ATTRIBUTE_UNUSED) | |
2749 { | |
2750 return gen_rtx_REG (Pmode, MMIX_STRUCT_VALUE_REGNUM); | |
2751 } | |
2752 | |
2753 /* | |
2754 * Local variables: | |
2755 * eval: (c-set-style "gnu") | |
2756 * indent-tabs-mode: t | |
2757 * End: | |
2758 */ |