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2a2ab3f9 JVA |
1 | /* Subroutines for insn-output.c for Intel 80386. |
2 | Copyright (C) 1988 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include <stdio.h> | |
21 | #include "config.h" | |
22 | #include "rtl.h" | |
23 | #include "regs.h" | |
24 | #include "hard-reg-set.h" | |
25 | #include "real.h" | |
26 | #include "insn-config.h" | |
27 | #include "conditions.h" | |
28 | #include "insn-flags.h" | |
29 | #include "output.h" | |
30 | #include "insn-attr.h" | |
31 | #include "tree.h" | |
32 | #include "flags.h" | |
33 | ||
34 | #define AT_BP(mode) (gen_rtx (MEM, (mode), frame_pointer_rtx)) | |
35 | ||
36 | extern FILE *asm_out_file; | |
37 | extern char *strcat (); | |
38 | ||
39 | char *singlemove_string (); | |
40 | char *output_move_const_single (); | |
41 | ||
42 | static char *hi_reg_name[] = HI_REGISTER_NAMES; | |
43 | static char *qi_reg_name[] = QI_REGISTER_NAMES; | |
44 | static char *qi_high_reg_name[] = QI_HIGH_REGISTER_NAMES; | |
4c0d89b5 RS |
45 | |
46 | /* Array of the smallest class containing reg number REGNO, indexed by | |
47 | REGNO. Used by REGNO_REG_CLASS in i386.h. */ | |
48 | ||
49 | enum reg_class regclass_map[FIRST_PSEUDO_REGISTER] = | |
50 | { | |
51 | /* ax, dx, cx, bx */ | |
52 | AREG, DREG, CREG, Q_REGS, | |
53 | /* si, di, bp, sp */ | |
54 | SIREG, DIREG, INDEX_REGS, GENERAL_REGS, | |
55 | /* FP registers */ | |
56 | FP_TOP_REG, FP_SECOND_REG, FLOAT_REGS, FLOAT_REGS, | |
57 | FLOAT_REGS, FLOAT_REGS, FLOAT_REGS, FLOAT_REGS, | |
58 | /* arg pointer */ | |
59 | INDEX_REGS | |
60 | }; | |
2a2ab3f9 JVA |
61 | \f |
62 | /* Output an insn whose source is a 386 integer register. SRC is the | |
63 | rtx for the register, and TEMPLATE is the op-code template. SRC may | |
64 | be either SImode or DImode. | |
65 | ||
66 | The template will be output with operands[0] as SRC, and operands[1] | |
67 | as a pointer to the top of the 386 stack. So a call from floatsidf2 | |
68 | would look like this: | |
69 | ||
70 | output_op_from_reg (operands[1], AS1 (fild%z0,%1)); | |
71 | ||
72 | where %z0 corresponds to the caller's operands[1], and is used to | |
73 | emit the proper size suffix. | |
74 | ||
75 | ??? Extend this to handle HImode - a 387 can load and store HImode | |
76 | values directly. */ | |
77 | ||
78 | void | |
79 | output_op_from_reg (src, template) | |
80 | rtx src; | |
81 | char *template; | |
82 | { | |
83 | rtx xops[4]; | |
84 | ||
85 | xops[0] = src; | |
86 | xops[1] = AT_SP (Pmode); | |
87 | xops[2] = gen_rtx (CONST_INT, VOIDmode, GET_MODE_SIZE (GET_MODE (src))); | |
88 | xops[3] = stack_pointer_rtx; | |
89 | ||
90 | if (GET_MODE_SIZE (GET_MODE (src)) > UNITS_PER_WORD) | |
91 | { | |
92 | rtx high = gen_rtx (REG, SImode, REGNO (src) + 1); | |
93 | output_asm_insn (AS1 (push%L0,%0), &high); | |
94 | } | |
95 | output_asm_insn (AS1 (push%L0,%0), &src); | |
96 | ||
97 | output_asm_insn (template, xops); | |
98 | ||
99 | output_asm_insn (AS2 (add%L3,%2,%3), xops); | |
100 | } | |
101 | \f | |
102 | /* Output an insn to pop an value from the 387 top-of-stack to 386 | |
103 | register DEST. The 387 register stack is popped if DIES is true. If | |
104 | the mode of DEST is an integer mode, a `fist' integer store is done, | |
105 | otherwise a `fst' float store is done. */ | |
106 | ||
107 | void | |
108 | output_to_reg (dest, dies) | |
109 | rtx dest; | |
110 | int dies; | |
111 | { | |
112 | rtx xops[4]; | |
113 | ||
114 | xops[0] = AT_SP (Pmode); | |
115 | xops[1] = stack_pointer_rtx; | |
116 | xops[2] = gen_rtx (CONST_INT, VOIDmode, GET_MODE_SIZE (GET_MODE (dest))); | |
117 | xops[3] = dest; | |
118 | ||
119 | output_asm_insn (AS2 (sub%L1,%2,%1), xops); | |
120 | ||
121 | if (GET_MODE_CLASS (GET_MODE (dest)) == MODE_INT) | |
122 | { | |
123 | if (dies) | |
124 | output_asm_insn (AS1 (fistp%z3,%y0), xops); | |
125 | else | |
126 | output_asm_insn (AS1 (fist%z3,%y0), xops); | |
127 | } | |
128 | else if (GET_MODE_CLASS (GET_MODE (dest)) == MODE_FLOAT) | |
129 | { | |
130 | if (dies) | |
131 | output_asm_insn (AS1 (fstp%z3,%y0), xops); | |
132 | else | |
133 | output_asm_insn (AS1 (fst%z3,%y0), xops); | |
134 | } | |
135 | else | |
136 | abort (); | |
137 | ||
138 | output_asm_insn (AS1 (pop%L0,%0), &dest); | |
139 | ||
140 | if (GET_MODE_SIZE (GET_MODE (dest)) > UNITS_PER_WORD) | |
141 | { | |
142 | dest = gen_rtx (REG, SImode, REGNO (dest) + 1); | |
143 | output_asm_insn (AS1 (pop%L0,%0), &dest); | |
144 | } | |
145 | } | |
146 | \f | |
147 | char * | |
148 | singlemove_string (operands) | |
149 | rtx *operands; | |
150 | { | |
151 | rtx x; | |
152 | if (GET_CODE (operands[0]) == MEM | |
153 | && GET_CODE (x = XEXP (operands[0], 0)) == PRE_DEC) | |
154 | { | |
155 | if (XEXP (x, 0) != stack_pointer_rtx) | |
156 | abort (); | |
157 | return "push%L1 %1"; | |
158 | } | |
159 | else if (GET_CODE (operands[1]) == CONST_DOUBLE) | |
160 | { | |
161 | return output_move_const_single (operands); | |
162 | } | |
163 | else if (GET_CODE (operands[0]) == REG || GET_CODE (operands[1]) == REG) | |
164 | return AS2 (mov%L0,%1,%0); | |
165 | else if (CONSTANT_P (operands[1])) | |
166 | return AS2 (mov%L0,%1,%0); | |
167 | else | |
168 | { | |
169 | output_asm_insn ("push%L1 %1", operands); | |
170 | return "pop%L0 %0"; | |
171 | } | |
172 | } | |
173 | \f | |
174 | /* Return a REG that occurs in ADDR with coefficient 1. | |
175 | ADDR can be effectively incremented by incrementing REG. */ | |
176 | ||
177 | static rtx | |
178 | find_addr_reg (addr) | |
179 | rtx addr; | |
180 | { | |
181 | while (GET_CODE (addr) == PLUS) | |
182 | { | |
183 | if (GET_CODE (XEXP (addr, 0)) == REG) | |
184 | addr = XEXP (addr, 0); | |
185 | else if (GET_CODE (XEXP (addr, 1)) == REG) | |
186 | addr = XEXP (addr, 1); | |
187 | else if (CONSTANT_P (XEXP (addr, 0))) | |
188 | addr = XEXP (addr, 1); | |
189 | else if (CONSTANT_P (XEXP (addr, 1))) | |
190 | addr = XEXP (addr, 0); | |
191 | else | |
192 | abort (); | |
193 | } | |
194 | if (GET_CODE (addr) == REG) | |
195 | return addr; | |
196 | abort (); | |
197 | } | |
198 | ||
199 | /* Output an insn to add the constant N to the register X. */ | |
200 | ||
201 | static void | |
202 | asm_add (n, x) | |
203 | int n; | |
204 | rtx x; | |
205 | { | |
206 | rtx xops[2]; | |
207 | xops[1] = x; | |
208 | if (n < 0) | |
209 | { | |
210 | xops[0] = gen_rtx (CONST_INT, VOIDmode, -n); | |
211 | output_asm_insn (AS2 (sub%L0,%0,%1), xops); | |
212 | } | |
213 | else if (n > 0) | |
214 | { | |
215 | xops[0] = gen_rtx (CONST_INT, VOIDmode, n); | |
216 | output_asm_insn (AS2 (add%L0,%0,%1), xops); | |
217 | } | |
218 | } | |
219 | ||
220 | /* Output assembler code to perform a doubleword move insn | |
221 | with operands OPERANDS. */ | |
222 | ||
223 | char * | |
224 | output_move_double (operands) | |
225 | rtx *operands; | |
226 | { | |
227 | enum {REGOP, OFFSOP, MEMOP, PUSHOP, POPOP, CNSTOP, RNDOP } optype0, optype1; | |
228 | rtx latehalf[2]; | |
229 | rtx addreg0 = 0, addreg1 = 0; | |
230 | ||
231 | /* First classify both operands. */ | |
232 | ||
233 | if (REG_P (operands[0])) | |
234 | optype0 = REGOP; | |
235 | else if (offsettable_memref_p (operands[0])) | |
236 | optype0 = OFFSOP; | |
237 | else if (GET_CODE (XEXP (operands[0], 0)) == POST_INC) | |
238 | optype0 = POPOP; | |
239 | else if (GET_CODE (XEXP (operands[0], 0)) == PRE_DEC) | |
240 | optype0 = PUSHOP; | |
241 | else if (GET_CODE (operands[0]) == MEM) | |
242 | optype0 = MEMOP; | |
243 | else | |
244 | optype0 = RNDOP; | |
245 | ||
246 | if (REG_P (operands[1])) | |
247 | optype1 = REGOP; | |
248 | else if (CONSTANT_P (operands[1])) | |
249 | optype1 = CNSTOP; | |
250 | else if (offsettable_memref_p (operands[1])) | |
251 | optype1 = OFFSOP; | |
252 | else if (GET_CODE (XEXP (operands[1], 0)) == POST_INC) | |
253 | optype1 = POPOP; | |
254 | else if (GET_CODE (XEXP (operands[1], 0)) == PRE_DEC) | |
255 | optype1 = PUSHOP; | |
256 | else if (GET_CODE (operands[1]) == MEM) | |
257 | optype1 = MEMOP; | |
258 | else | |
259 | optype1 = RNDOP; | |
260 | ||
261 | /* Check for the cases that the operand constraints are not | |
262 | supposed to allow to happen. Abort if we get one, | |
263 | because generating code for these cases is painful. */ | |
264 | ||
265 | if (optype0 == RNDOP || optype1 == RNDOP) | |
266 | abort (); | |
267 | ||
268 | /* If one operand is decrementing and one is incrementing | |
269 | decrement the former register explicitly | |
270 | and change that operand into ordinary indexing. */ | |
271 | ||
272 | if (optype0 == PUSHOP && optype1 == POPOP) | |
273 | { | |
274 | operands[0] = XEXP (XEXP (operands[0], 0), 0); | |
275 | asm_add (-8, operands[0]); | |
276 | operands[0] = gen_rtx (MEM, DImode, operands[0]); | |
277 | optype0 = OFFSOP; | |
278 | } | |
279 | if (optype0 == POPOP && optype1 == PUSHOP) | |
280 | { | |
281 | operands[1] = XEXP (XEXP (operands[1], 0), 0); | |
282 | asm_add (-8, operands[1]); | |
283 | operands[1] = gen_rtx (MEM, DImode, operands[1]); | |
284 | optype1 = OFFSOP; | |
285 | } | |
286 | ||
287 | /* If an operand is an unoffsettable memory ref, find a register | |
288 | we can increment temporarily to make it refer to the second word. */ | |
289 | ||
290 | if (optype0 == MEMOP) | |
291 | addreg0 = find_addr_reg (XEXP (operands[0], 0)); | |
292 | ||
293 | if (optype1 == MEMOP) | |
294 | addreg1 = find_addr_reg (XEXP (operands[1], 0)); | |
295 | ||
296 | /* Ok, we can do one word at a time. | |
297 | Normally we do the low-numbered word first, | |
298 | but if either operand is autodecrementing then we | |
299 | do the high-numbered word first. | |
300 | ||
301 | In either case, set up in LATEHALF the operands to use | |
302 | for the high-numbered word and in some cases alter the | |
303 | operands in OPERANDS to be suitable for the low-numbered word. */ | |
304 | ||
305 | if (optype0 == REGOP) | |
306 | latehalf[0] = gen_rtx (REG, SImode, REGNO (operands[0]) + 1); | |
307 | else if (optype0 == OFFSOP) | |
308 | latehalf[0] = adj_offsettable_operand (operands[0], 4); | |
309 | else | |
310 | latehalf[0] = operands[0]; | |
311 | ||
312 | if (optype1 == REGOP) | |
313 | latehalf[1] = gen_rtx (REG, SImode, REGNO (operands[1]) + 1); | |
314 | else if (optype1 == OFFSOP) | |
315 | latehalf[1] = adj_offsettable_operand (operands[1], 4); | |
316 | else if (optype1 == CNSTOP) | |
317 | { | |
318 | if (GET_CODE (operands[1]) == CONST_DOUBLE) | |
319 | split_double (operands[1], &operands[1], &latehalf[1]); | |
320 | else if (CONSTANT_P (operands[1])) | |
321 | latehalf[1] = const0_rtx; | |
322 | } | |
323 | else | |
324 | latehalf[1] = operands[1]; | |
325 | ||
326 | /* If insn is effectively movd N (sp),-(sp) then we will do the | |
327 | high word first. We should use the adjusted operand 1 (which is N+4 (sp)) | |
328 | for the low word as well, to compensate for the first decrement of sp. */ | |
329 | if (optype0 == PUSHOP | |
330 | && REGNO (XEXP (XEXP (operands[0], 0), 0)) == STACK_POINTER_REGNUM | |
331 | && reg_overlap_mentioned_p (stack_pointer_rtx, operands[1])) | |
332 | operands[1] = latehalf[1]; | |
333 | ||
334 | /* If one or both operands autodecrementing, | |
335 | do the two words, high-numbered first. */ | |
336 | ||
337 | /* Likewise, the first move would clobber the source of the second one, | |
338 | do them in the other order. This happens only for registers; | |
339 | such overlap can't happen in memory unless the user explicitly | |
340 | sets it up, and that is an undefined circumstance. */ | |
341 | ||
342 | if (optype0 == PUSHOP || optype1 == PUSHOP | |
343 | || (optype0 == REGOP && optype1 == REGOP | |
344 | && REGNO (operands[0]) == REGNO (latehalf[1]))) | |
345 | { | |
346 | /* Make any unoffsettable addresses point at high-numbered word. */ | |
347 | if (addreg0) | |
348 | asm_add (4, addreg0); | |
349 | if (addreg1) | |
350 | asm_add (4, addreg1); | |
351 | ||
352 | /* Do that word. */ | |
353 | output_asm_insn (singlemove_string (latehalf), latehalf); | |
354 | ||
355 | /* Undo the adds we just did. */ | |
356 | if (addreg0) | |
357 | asm_add (-4, addreg0); | |
358 | if (addreg1) | |
359 | asm_add (-4, addreg1); | |
360 | ||
361 | /* Do low-numbered word. */ | |
362 | return singlemove_string (operands); | |
363 | } | |
364 | ||
365 | /* Normal case: do the two words, low-numbered first. */ | |
366 | ||
367 | output_asm_insn (singlemove_string (operands), operands); | |
368 | ||
369 | /* Make any unoffsettable addresses point at high-numbered word. */ | |
370 | if (addreg0) | |
371 | asm_add (4, addreg0); | |
372 | if (addreg1) | |
373 | asm_add (4, addreg1); | |
374 | ||
375 | /* Do that word. */ | |
376 | output_asm_insn (singlemove_string (latehalf), latehalf); | |
377 | ||
378 | /* Undo the adds we just did. */ | |
379 | if (addreg0) | |
380 | asm_add (-4, addreg0); | |
381 | if (addreg1) | |
382 | asm_add (-4, addreg1); | |
383 | ||
384 | return ""; | |
385 | } | |
386 | \f | |
387 | int | |
388 | standard_80387_constant_p (x) | |
389 | rtx x; | |
390 | { | |
391 | union real_extract u; | |
392 | register double d; | |
393 | ||
394 | bcopy (&CONST_DOUBLE_LOW (x), &u, sizeof u); | |
395 | d = u.d; | |
396 | ||
397 | if (d == 0) | |
398 | return 1; | |
399 | ||
400 | if (d == 1) | |
401 | return 2; | |
402 | ||
403 | /* Note that on the 80387, other constants, such as pi, | |
404 | are much slower to load as standard constants | |
405 | than to load from doubles in memory! */ | |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
410 | char * | |
411 | output_move_const_single (operands) | |
412 | rtx *operands; | |
413 | { | |
414 | if (FP_REG_P (operands[0])) | |
415 | { | |
416 | int conval = standard_80387_constant_p (operands[1]); | |
417 | ||
418 | if (conval == 1) | |
419 | return "fldz"; | |
420 | ||
421 | if (conval == 2) | |
422 | return "fld1"; | |
423 | } | |
424 | if (GET_CODE (operands[1]) == CONST_DOUBLE) | |
425 | { | |
426 | union { int i[2]; double d;} u1; | |
427 | union { int i; float f;} u2; | |
428 | u1.i[0] = CONST_DOUBLE_LOW (operands[1]); | |
429 | u1.i[1] = CONST_DOUBLE_HIGH (operands[1]); | |
430 | u2.f = u1.d; | |
431 | operands[1] = gen_rtx (CONST_INT, VOIDmode, u2.i); | |
432 | } | |
433 | return singlemove_string (operands); | |
434 | } | |
435 | \f | |
436 | /* Returns 1 if OP is either a symbol reference or a sum of a symbol | |
437 | reference and a constant. */ | |
438 | ||
439 | int | |
440 | symbolic_operand (op, mode) | |
441 | register rtx op; | |
442 | enum machine_mode mode; | |
443 | { | |
444 | switch (GET_CODE (op)) | |
445 | { | |
446 | case SYMBOL_REF: | |
447 | case LABEL_REF: | |
448 | return 1; | |
449 | case CONST: | |
450 | op = XEXP (op, 0); | |
451 | return ((GET_CODE (XEXP (op, 0)) == SYMBOL_REF | |
452 | || GET_CODE (XEXP (op, 0)) == LABEL_REF) | |
453 | && GET_CODE (XEXP (op, 1)) == CONST_INT); | |
454 | default: | |
455 | return 0; | |
456 | } | |
457 | } | |
458 | \f | |
459 | /* Returns 1 if OP contains a symbol reference */ | |
460 | ||
461 | int | |
462 | symbolic_reference_mentioned_p (op) | |
463 | rtx op; | |
464 | { | |
465 | register char *fmt; | |
466 | register int i; | |
467 | ||
468 | if (GET_CODE (op) == SYMBOL_REF || GET_CODE (op) == LABEL_REF) | |
469 | return 1; | |
470 | ||
471 | fmt = GET_RTX_FORMAT (GET_CODE (op)); | |
472 | for (i = GET_RTX_LENGTH (GET_CODE (op)) - 1; i >= 0; i--) | |
473 | { | |
474 | if (fmt[i] == 'E') | |
475 | { | |
476 | register int j; | |
477 | ||
478 | for (j = XVECLEN (op, i) - 1; j >= 0; j--) | |
479 | if (symbolic_reference_mentioned_p (XVECEXP (op, i, j))) | |
480 | return 1; | |
481 | } | |
482 | else if (fmt[i] == 'e' && symbolic_reference_mentioned_p (XEXP (op, i))) | |
483 | return 1; | |
484 | } | |
485 | ||
486 | return 0; | |
487 | } | |
488 | \f | |
489 | /* Return a legitimate reference for ORIG (an address) using the | |
490 | register REG. If REG is 0, a new pseudo is generated. | |
491 | ||
492 | There are three types of references that must be handled: | |
493 | ||
494 | 1. Global data references must load the address from the GOT, via | |
495 | the PIC reg. An insn is emitted to do this load, and the reg is | |
496 | returned. | |
497 | ||
498 | 2. Static data references must compute the address as an offset | |
499 | from the GOT, whose base is in the PIC reg. An insn is emitted to | |
500 | compute the address into a reg, and the reg is returned. Static | |
501 | data objects have SYMBOL_REF_FLAG set to differentiate them from | |
502 | global data objects. | |
503 | ||
504 | 3. Constant pool addresses must be handled special. They are | |
505 | considered legitimate addresses, but only if not used with regs. | |
506 | When printed, the output routines know to print the reference with the | |
507 | PIC reg, even though the PIC reg doesn't appear in the RTL. | |
508 | ||
509 | GO_IF_LEGITIMATE_ADDRESS rejects symbolic references unless the PIC | |
510 | reg also appears in the address (except for constant pool references, | |
511 | noted above). | |
512 | ||
513 | "switch" statements also require special handling when generating | |
514 | PIC code. See comments by the `casesi' insn in i386.md for details. */ | |
515 | ||
516 | rtx | |
517 | legitimize_pic_address (orig, reg) | |
518 | rtx orig; | |
519 | rtx reg; | |
520 | { | |
521 | rtx addr = orig; | |
522 | rtx new = orig; | |
523 | ||
524 | if (GET_CODE (addr) == SYMBOL_REF || GET_CODE (addr) == LABEL_REF) | |
525 | { | |
526 | if (GET_CODE (addr) == SYMBOL_REF && CONSTANT_POOL_ADDRESS_P (addr)) | |
527 | reg = new = orig; | |
528 | else | |
529 | { | |
530 | if (reg == 0) | |
531 | reg = gen_reg_rtx (Pmode); | |
532 | ||
533 | if (GET_CODE (addr) == SYMBOL_REF && SYMBOL_REF_FLAG (addr)) | |
534 | new = gen_rtx (PLUS, Pmode, pic_offset_table_rtx, orig); | |
535 | else | |
536 | new = gen_rtx (MEM, Pmode, | |
537 | gen_rtx (PLUS, Pmode, | |
538 | pic_offset_table_rtx, orig)); | |
539 | ||
540 | emit_move_insn (reg, new); | |
541 | } | |
542 | current_function_uses_pic_offset_table = 1; | |
543 | return reg; | |
544 | } | |
545 | else if (GET_CODE (addr) == CONST || GET_CODE (addr) == PLUS) | |
546 | { | |
547 | rtx base; | |
548 | ||
549 | if (GET_CODE (addr) == CONST) | |
550 | { | |
551 | addr = XEXP (addr, 0); | |
552 | if (GET_CODE (addr) != PLUS) | |
553 | abort (); | |
554 | } | |
555 | ||
556 | if (XEXP (addr, 0) == pic_offset_table_rtx) | |
557 | return orig; | |
558 | ||
559 | if (reg == 0) | |
560 | reg = gen_reg_rtx (Pmode); | |
561 | ||
562 | base = legitimize_pic_address (XEXP (addr, 0), reg); | |
563 | addr = legitimize_pic_address (XEXP (addr, 1), base == reg ? 0 : reg); | |
564 | ||
565 | if (GET_CODE (addr) == CONST_INT) | |
566 | return plus_constant (base, INTVAL (addr)); | |
567 | ||
568 | if (GET_CODE (addr) == PLUS && CONSTANT_P (XEXP (addr, 1))) | |
569 | { | |
570 | base = gen_rtx (PLUS, Pmode, base, XEXP (addr, 0)); | |
571 | addr = XEXP (addr, 1); | |
572 | } | |
573 | return gen_rtx (PLUS, Pmode, base, addr); | |
574 | } | |
575 | return new; | |
576 | } | |
577 | \f | |
578 | /* Emit insns to move operands[1] into operands[0]. */ | |
579 | ||
580 | void | |
581 | emit_pic_move (operands, mode) | |
582 | rtx *operands; | |
583 | enum machine_mode mode; | |
584 | { | |
585 | rtx temp = reload_in_progress ? operands[0] : gen_reg_rtx (Pmode); | |
586 | ||
587 | if (GET_CODE (operands[0]) == MEM && SYMBOLIC_CONST (operands[1])) | |
588 | operands[1] = (rtx) force_reg (SImode, operands[1]); | |
589 | else | |
590 | operands[1] = legitimize_pic_address (operands[1], temp); | |
591 | } | |
592 | \f | |
593 | /* This function generates the assembly code for function entry. | |
594 | FILE is an stdio stream to output the code to. | |
595 | SIZE is an int: how many units of temporary storage to allocate. */ | |
596 | ||
597 | void | |
598 | function_prologue (file, size) | |
599 | FILE *file; | |
600 | int size; | |
601 | { | |
602 | register int regno; | |
603 | int limit; | |
604 | rtx xops[4]; | |
605 | ||
606 | xops[0] = stack_pointer_rtx; | |
607 | xops[1] = frame_pointer_rtx; | |
608 | xops[2] = gen_rtx (CONST_INT, VOIDmode, size); | |
609 | if (frame_pointer_needed) | |
610 | { | |
611 | output_asm_insn ("push%L1 %1", xops); | |
612 | output_asm_insn (AS2 (mov%L0,%0,%1), xops); | |
613 | } | |
614 | ||
615 | if (size) | |
616 | output_asm_insn (AS2 (sub%L0,%2,%0), xops); | |
617 | ||
618 | /* Note If use enter it is NOT reversed args. | |
619 | This one is not reversed from intel!! | |
620 | I think enter is slower. Also sdb doesn't like it. | |
621 | But if you want it the code is: | |
622 | { | |
623 | xops[3] = const0_rtx; | |
624 | output_asm_insn ("enter %2,%3", xops); | |
625 | } | |
626 | */ | |
627 | limit = (frame_pointer_needed ? FRAME_POINTER_REGNUM : STACK_POINTER_REGNUM); | |
628 | for (regno = limit - 1; regno >= 0; regno--) | |
629 | if ((regs_ever_live[regno] && ! call_used_regs[regno]) | |
630 | || (current_function_uses_pic_offset_table | |
631 | && regno == PIC_OFFSET_TABLE_REGNUM)) | |
632 | { | |
633 | xops[0] = gen_rtx (REG, SImode, regno); | |
634 | output_asm_insn ("push%L0 %0", xops); | |
635 | } | |
636 | ||
637 | if (current_function_uses_pic_offset_table) | |
638 | { | |
639 | xops[0] = pic_offset_table_rtx; | |
640 | xops[1] = (rtx) gen_label_rtx (); | |
641 | ||
642 | output_asm_insn (AS1 (call,%P1), xops); | |
643 | ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (xops[1])); | |
644 | output_asm_insn (AS1 (pop%L0,%0), xops); | |
645 | output_asm_insn ("addl $_GLOBAL_OFFSET_TABLE_+[.-%P1],%0", xops); | |
646 | } | |
647 | } | |
648 | ||
649 | /* Return 1 if it is appropriate to emit `ret' instructions in the | |
650 | body of a function. Do this only if the epilogue is simple, needing a | |
651 | couple of insns. Prior to reloading, we can't tell how many registers | |
652 | must be saved, so return 0 then. | |
653 | ||
654 | If NON_SAVING_SETJMP is defined and true, then it is not possible | |
655 | for the epilogue to be simple, so return 0. This is a special case | |
656 | since NON_SAVING_SETJMP will not cause regs_ever_live to change until | |
657 | final, but jump_optimize may need to know sooner if a `return' is OK. */ | |
658 | ||
659 | int | |
660 | simple_386_epilogue () | |
661 | { | |
662 | int regno; | |
663 | int nregs = 0; | |
664 | int reglimit = (frame_pointer_needed | |
665 | ? FRAME_POINTER_REGNUM : STACK_POINTER_REGNUM); | |
666 | ||
667 | #ifdef NON_SAVING_SETJMP | |
668 | if (NON_SAVING_SETJMP && current_function_calls_setjmp) | |
669 | return 0; | |
670 | #endif | |
671 | ||
672 | if (! reload_completed) | |
673 | return 0; | |
674 | ||
675 | for (regno = reglimit - 1; regno >= 0; regno--) | |
676 | if ((regs_ever_live[regno] && ! call_used_regs[regno]) | |
677 | || (current_function_uses_pic_offset_table | |
678 | && regno == PIC_OFFSET_TABLE_REGNUM)) | |
679 | nregs++; | |
680 | ||
681 | return nregs == 0 || ! frame_pointer_needed; | |
682 | } | |
683 | ||
684 | /* This function generates the assembly code for function exit. | |
685 | FILE is an stdio stream to output the code to. | |
686 | SIZE is an int: how many units of temporary storage to deallocate. */ | |
687 | ||
688 | void | |
689 | function_epilogue (file, size) | |
690 | FILE *file; | |
691 | int size; | |
692 | { | |
693 | register int regno; | |
694 | register int nregs, limit; | |
695 | int offset; | |
696 | rtx xops[3]; | |
697 | ||
698 | /* Compute the number of registers to pop */ | |
699 | ||
700 | limit = (frame_pointer_needed | |
701 | ? FRAME_POINTER_REGNUM | |
702 | : STACK_POINTER_REGNUM); | |
703 | ||
704 | nregs = 0; | |
705 | ||
706 | for (regno = limit - 1; regno >= 0; regno--) | |
707 | if ((regs_ever_live[regno] && ! call_used_regs[regno]) | |
708 | || (current_function_uses_pic_offset_table | |
709 | && regno == PIC_OFFSET_TABLE_REGNUM)) | |
710 | nregs++; | |
711 | ||
712 | /* sp is often unreliable so we must go off the frame pointer, | |
713 | */ | |
714 | ||
715 | /* In reality, we may not care if sp is unreliable, because we can | |
716 | restore the register relative to the frame pointer. In theory, | |
717 | since each move is the same speed as a pop, and we don't need the | |
718 | leal, this is faster. For now restore multiple registers the old | |
719 | way. */ | |
720 | ||
721 | offset = -size - (nregs * UNITS_PER_WORD); | |
722 | ||
723 | xops[2] = stack_pointer_rtx; | |
724 | ||
725 | if (nregs > 1 || ! frame_pointer_needed) | |
726 | { | |
727 | if (frame_pointer_needed) | |
728 | { | |
729 | xops[0] = adj_offsettable_operand (AT_BP (Pmode), offset); | |
730 | output_asm_insn (AS2 (lea%L2,%0,%2), xops); | |
731 | } | |
732 | ||
733 | for (regno = 0; regno < limit; regno++) | |
734 | if ((regs_ever_live[regno] && ! call_used_regs[regno]) | |
735 | || (current_function_uses_pic_offset_table | |
736 | && regno == PIC_OFFSET_TABLE_REGNUM)) | |
737 | { | |
738 | xops[0] = gen_rtx (REG, SImode, regno); | |
739 | output_asm_insn ("pop%L0 %0", xops); | |
740 | } | |
741 | } | |
742 | else | |
743 | for (regno = 0; regno < limit; regno++) | |
744 | if ((regs_ever_live[regno] && ! call_used_regs[regno]) | |
745 | || (current_function_uses_pic_offset_table | |
746 | && regno == PIC_OFFSET_TABLE_REGNUM)) | |
747 | { | |
748 | xops[0] = gen_rtx (REG, SImode, regno); | |
749 | xops[1] = adj_offsettable_operand (AT_BP (Pmode), offset); | |
750 | output_asm_insn (AS2 (mov%L0,%1,%0), xops); | |
751 | offset += 4; | |
752 | } | |
753 | ||
754 | if (frame_pointer_needed) | |
755 | { | |
756 | /* On i486, mov & pop is faster than "leave". */ | |
757 | ||
758 | if (TARGET_486) | |
759 | { | |
760 | xops[0] = frame_pointer_rtx; | |
761 | output_asm_insn (AS2 (mov%L2,%0,%2), xops); | |
762 | output_asm_insn ("pop%L0 %0", xops); | |
763 | } | |
764 | else | |
765 | output_asm_insn ("leave", xops); | |
766 | } | |
767 | else if (size) | |
768 | { | |
769 | /* If there is no frame pointer, we must still release the frame. */ | |
770 | ||
771 | xops[0] = gen_rtx (CONST_INT, VOIDmode, size); | |
772 | output_asm_insn (AS2 (add%L2,%0,%2), xops); | |
773 | } | |
774 | ||
775 | if (current_function_pops_args && current_function_args_size) | |
776 | { | |
777 | xops[1] = gen_rtx (CONST_INT, VOIDmode, current_function_pops_args); | |
778 | ||
779 | /* i386 can only pop 32K bytes (maybe 64K? Is it signed?). If | |
780 | asked to pop more, pop return address, do explicit add, and jump | |
781 | indirectly to the caller. */ | |
782 | ||
783 | if (current_function_pops_args >= 32768) | |
784 | { | |
785 | /* ??? Which register to use here? */ | |
786 | xops[0] = gen_rtx (REG, SImode, 2); | |
787 | output_asm_insn ("pop%L0 %0", xops); | |
788 | output_asm_insn (AS2 (add%L2,%1,%2), xops); | |
789 | output_asm_insn ("jmp %*%0", xops); | |
790 | } | |
791 | else | |
792 | output_asm_insn ("ret %1", xops); | |
793 | } | |
794 | else if (current_function_returns_struct) | |
795 | { | |
796 | xops[0] = gen_rtx (CONST_INT, VOIDmode, 4); | |
797 | output_asm_insn ("ret %0", xops); | |
798 | } | |
799 | else | |
800 | output_asm_insn ("ret", xops); | |
801 | } | |
802 | \f | |
803 | /* Print an integer constant expression in assembler syntax. Addition | |
804 | and subtraction are the only arithmetic that may appear in these | |
805 | expressions. FILE is the stdio stream to write to, X is the rtx, and | |
806 | CODE is the operand print code from the output string. */ | |
807 | ||
808 | static void | |
809 | output_pic_addr_const (file, x, code) | |
810 | FILE *file; | |
811 | rtx x; | |
812 | int code; | |
813 | { | |
814 | char buf[256]; | |
815 | ||
816 | switch (GET_CODE (x)) | |
817 | { | |
818 | case PC: | |
819 | if (flag_pic) | |
820 | putc ('.', file); | |
821 | else | |
822 | abort (); | |
823 | break; | |
824 | ||
825 | case SYMBOL_REF: | |
826 | case LABEL_REF: | |
827 | if (GET_CODE (x) == SYMBOL_REF) | |
828 | assemble_name (file, XSTR (x, 0)); | |
829 | else | |
830 | { | |
831 | ASM_GENERATE_INTERNAL_LABEL (buf, "L", | |
832 | CODE_LABEL_NUMBER (XEXP (x, 0))); | |
833 | assemble_name (asm_out_file, buf); | |
834 | } | |
835 | ||
836 | if (GET_CODE (x) == SYMBOL_REF && CONSTANT_POOL_ADDRESS_P (x)) | |
837 | fprintf (file, "@GOTOFF(%%ebx)"); | |
838 | else if (code == 'P') | |
839 | fprintf (file, "@PLT"); | |
840 | else if (GET_CODE (x) == LABEL_REF || ! SYMBOL_REF_FLAG (x)) | |
841 | fprintf (file, "@GOT"); | |
842 | else | |
843 | fprintf (file, "@GOTOFF"); | |
844 | ||
845 | break; | |
846 | ||
847 | case CODE_LABEL: | |
848 | ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x)); | |
849 | assemble_name (asm_out_file, buf); | |
850 | break; | |
851 | ||
852 | case CONST_INT: | |
853 | fprintf (file, "%d", INTVAL (x)); | |
854 | break; | |
855 | ||
856 | case CONST: | |
857 | /* This used to output parentheses around the expression, | |
858 | but that does not work on the 386 (either ATT or BSD assembler). */ | |
859 | output_pic_addr_const (file, XEXP (x, 0), code); | |
860 | break; | |
861 | ||
862 | case CONST_DOUBLE: | |
863 | if (GET_MODE (x) == VOIDmode) | |
864 | { | |
865 | /* We can use %d if the number is <32 bits and positive. */ | |
866 | if (CONST_DOUBLE_HIGH (x) || CONST_DOUBLE_LOW (x) < 0) | |
867 | fprintf (file, "0x%x%08x", | |
868 | CONST_DOUBLE_HIGH (x), CONST_DOUBLE_LOW (x)); | |
869 | else | |
870 | fprintf (file, "%d", CONST_DOUBLE_LOW (x)); | |
871 | } | |
872 | else | |
873 | /* We can't handle floating point constants; | |
874 | PRINT_OPERAND must handle them. */ | |
875 | output_operand_lossage ("floating constant misused"); | |
876 | break; | |
877 | ||
878 | case PLUS: | |
879 | /* Some assemblers need integer constants to appear last (eg masm). */ | |
880 | if (GET_CODE (XEXP (x, 0)) == CONST_INT) | |
881 | { | |
882 | output_pic_addr_const (file, XEXP (x, 1), code); | |
883 | if (INTVAL (XEXP (x, 0)) >= 0) | |
884 | fprintf (file, "+"); | |
885 | output_pic_addr_const (file, XEXP (x, 0), code); | |
886 | } | |
887 | else | |
888 | { | |
889 | output_pic_addr_const (file, XEXP (x, 0), code); | |
890 | if (INTVAL (XEXP (x, 1)) >= 0) | |
891 | fprintf (file, "+"); | |
892 | output_pic_addr_const (file, XEXP (x, 1), code); | |
893 | } | |
894 | break; | |
895 | ||
896 | case MINUS: | |
897 | output_pic_addr_const (file, XEXP (x, 0), code); | |
898 | fprintf (file, "-"); | |
899 | output_pic_addr_const (file, XEXP (x, 1), code); | |
900 | break; | |
901 | ||
902 | default: | |
903 | output_operand_lossage ("invalid expression as operand"); | |
904 | } | |
905 | } | |
906 | \f | |
907 | /* Print the name of a register based on its machine mode and number. | |
908 | If CODE is 'w', pretend the mode is HImode. | |
909 | If CODE is 'b', pretend the mode is QImode. | |
910 | If CODE is 'k', pretend the mode is SImode. | |
911 | If CODE is 'h', pretend the reg is the `high' byte register. | |
912 | If CODE is 'y', print "st(0)" instead of "st", if the reg is stack op. */ | |
913 | ||
914 | #define PRINT_REG(X, CODE, FILE) \ | |
915 | do { if (REGNO (X) == ARG_POINTER_REGNUM) \ | |
916 | abort (); \ | |
917 | fprintf (FILE, "%s", RP); \ | |
918 | switch ((CODE == 'w' ? 2 \ | |
919 | : CODE == 'b' ? 1 \ | |
920 | : CODE == 'k' ? 4 \ | |
921 | : CODE == 'y' ? 3 \ | |
922 | : CODE == 'h' ? 0 \ | |
923 | : GET_MODE_SIZE (GET_MODE (X)))) \ | |
924 | { \ | |
925 | case 3: \ | |
926 | if (STACK_TOP_P (X)) \ | |
927 | { \ | |
928 | fputs ("st(0)", FILE); \ | |
929 | break; \ | |
930 | } \ | |
931 | case 4: \ | |
932 | case 8: \ | |
933 | if (!FP_REG_P (X)) fputs ("e", FILE); \ | |
934 | case 2: \ | |
935 | fputs (hi_reg_name[REGNO (X)], FILE); \ | |
936 | break; \ | |
937 | case 1: \ | |
938 | fputs (qi_reg_name[REGNO (X)], FILE); \ | |
939 | break; \ | |
940 | case 0: \ | |
941 | fputs (qi_high_reg_name[REGNO (X)], FILE); \ | |
942 | break; \ | |
943 | } \ | |
944 | } while (0) | |
945 | ||
946 | /* Meaning of CODE: | |
947 | f -- float insn (print a CONST_DOUBLE as a float rather than in hex). | |
948 | D,L,W,B,Q,S -- print the opcode suffix for specified size of operand. | |
949 | R -- print the prefix for register names. | |
950 | z -- print the opcode suffix for the size of the current operand. | |
951 | * -- print a star (in certain assembler syntax) | |
952 | w -- print the operand as if it's a "word" (HImode) even if it isn't. | |
953 | c -- don't print special prefixes before constant operands. | |
954 | */ | |
955 | ||
956 | void | |
957 | print_operand (file, x, code) | |
958 | FILE *file; | |
959 | rtx x; | |
960 | int code; | |
961 | { | |
962 | if (code) | |
963 | { | |
964 | switch (code) | |
965 | { | |
966 | case '*': | |
967 | if (USE_STAR) | |
968 | putc ('*', file); | |
969 | return; | |
970 | ||
971 | case 'D': | |
972 | PUT_OP_SIZE (code, 'l', file); | |
973 | case 'L': | |
974 | PUT_OP_SIZE (code, 'l', file); | |
975 | return; | |
976 | ||
977 | case 'W': | |
978 | PUT_OP_SIZE (code, 'w', file); | |
979 | return; | |
980 | ||
981 | case 'B': | |
982 | PUT_OP_SIZE (code, 'b', file); | |
983 | return; | |
984 | ||
985 | case 'Q': | |
986 | PUT_OP_SIZE (code, 'l', file); | |
987 | return; | |
988 | ||
989 | case 'S': | |
990 | PUT_OP_SIZE (code, 's', file); | |
991 | return; | |
992 | ||
993 | case 'R': | |
994 | fprintf (file, "%s", RP); | |
995 | return; | |
996 | ||
997 | case 'z': | |
998 | /* 387 opcodes don't get size suffixes if the operands are | |
999 | registers. */ | |
1000 | ||
1001 | if (STACK_REG_P (x)) | |
1002 | return; | |
1003 | ||
1004 | /* this is the size of op from size of operand */ | |
1005 | switch (GET_MODE_SIZE (GET_MODE (x))) | |
1006 | { | |
1007 | case 1: | |
1008 | PUT_OP_SIZE ('B', 'b', file); | |
1009 | return; | |
1010 | ||
1011 | case 2: | |
1012 | PUT_OP_SIZE ('W', 'w', file); | |
1013 | return; | |
1014 | ||
1015 | case 4: | |
1016 | if (GET_MODE (x) == SFmode) | |
1017 | { | |
1018 | PUT_OP_SIZE ('S', 's', file); | |
1019 | return; | |
1020 | } | |
1021 | else | |
1022 | PUT_OP_SIZE ('L', 'l', file); | |
1023 | return; | |
1024 | ||
1025 | case 8: | |
1026 | if (GET_MODE_CLASS (GET_MODE (x)) == MODE_INT) | |
1027 | PUT_OP_SIZE ('Q', 'l', file); | |
1028 | ||
1029 | PUT_OP_SIZE ('Q', 'l', file); | |
1030 | return; | |
1031 | } | |
1032 | } | |
1033 | } | |
1034 | if (GET_CODE (x) == REG) | |
1035 | { | |
1036 | PRINT_REG (x, code, file); | |
1037 | } | |
1038 | else if (GET_CODE (x) == MEM) | |
1039 | { | |
1040 | PRINT_PTR (x, file); | |
1041 | if (CONSTANT_ADDRESS_P (XEXP (x, 0))) | |
1042 | { | |
1043 | if (flag_pic) | |
1044 | output_pic_addr_const (file, XEXP (x, 0), code); | |
1045 | else | |
1046 | output_addr_const (file, XEXP (x, 0)); | |
1047 | } | |
1048 | else | |
1049 | output_address (XEXP (x, 0)); | |
1050 | } | |
1051 | else if (GET_CODE (x) == CONST_DOUBLE && GET_MODE (x) == SFmode) | |
1052 | { | |
1053 | union { double d; int i[2]; } u; | |
1054 | union { float f; int i; } u1; | |
1055 | u.i[0] = CONST_DOUBLE_LOW (x); | |
1056 | u.i[1] = CONST_DOUBLE_HIGH (x); | |
1057 | u1.f = u.d; | |
1058 | if (code == 'f') | |
1059 | fprintf (file, "%.22e", u1.f); | |
1060 | else | |
1061 | { | |
1062 | PRINT_IMMED_PREFIX (file); | |
1063 | fprintf (file, "0x%x", u1.i); | |
1064 | } | |
1065 | } | |
1066 | else if (GET_CODE (x) == CONST_DOUBLE && GET_MODE (x) == DFmode) | |
1067 | { | |
1068 | union { double d; int i[2]; } u; | |
1069 | u.i[0] = CONST_DOUBLE_LOW (x); | |
1070 | u.i[1] = CONST_DOUBLE_HIGH (x); | |
1071 | fprintf (file, "%.22e", u.d); | |
1072 | } | |
1073 | else | |
1074 | { | |
1075 | if (code != 'c' && code != 'P') | |
1076 | { | |
1077 | if (GET_CODE (x) == CONST_INT) | |
1078 | PRINT_IMMED_PREFIX (file); | |
1079 | else if (GET_CODE (x) == CONST || GET_CODE (x) == SYMBOL_REF | |
1080 | || GET_CODE (x) == LABEL_REF) | |
1081 | PRINT_OFFSET_PREFIX (file); | |
1082 | } | |
1083 | if (flag_pic) | |
1084 | output_pic_addr_const (file, x, code); | |
1085 | else | |
1086 | output_addr_const (file, x); | |
1087 | } | |
1088 | } | |
1089 | \f | |
1090 | /* Print a memory operand whose address is ADDR. */ | |
1091 | ||
1092 | void | |
1093 | print_operand_address (file, addr) | |
1094 | FILE *file; | |
1095 | register rtx addr; | |
1096 | { | |
1097 | register rtx reg1, reg2, breg, ireg; | |
1098 | rtx offset; | |
1099 | ||
1100 | switch (GET_CODE (addr)) | |
1101 | { | |
1102 | case REG: | |
1103 | ADDR_BEG (file); | |
1104 | fprintf (file, "%se", RP); | |
1105 | fputs (hi_reg_name[REGNO (addr)], file); | |
1106 | ADDR_END (file); | |
1107 | break; | |
1108 | ||
1109 | case PLUS: | |
1110 | reg1 = 0; | |
1111 | reg2 = 0; | |
1112 | ireg = 0; | |
1113 | breg = 0; | |
1114 | offset = 0; | |
1115 | if (CONSTANT_ADDRESS_P (XEXP (addr, 0))) | |
1116 | { | |
1117 | offset = XEXP (addr, 0); | |
1118 | addr = XEXP (addr, 1); | |
1119 | } | |
1120 | else if (CONSTANT_ADDRESS_P (XEXP (addr, 1))) | |
1121 | { | |
1122 | offset = XEXP (addr, 1); | |
1123 | addr = XEXP (addr, 0); | |
1124 | } | |
1125 | if (GET_CODE (addr) != PLUS) ; | |
1126 | else if (GET_CODE (XEXP (addr, 0)) == MULT) | |
1127 | { | |
1128 | reg1 = XEXP (addr, 0); | |
1129 | addr = XEXP (addr, 1); | |
1130 | } | |
1131 | else if (GET_CODE (XEXP (addr, 1)) == MULT) | |
1132 | { | |
1133 | reg1 = XEXP (addr, 1); | |
1134 | addr = XEXP (addr, 0); | |
1135 | } | |
1136 | else if (GET_CODE (XEXP (addr, 0)) == REG) | |
1137 | { | |
1138 | reg1 = XEXP (addr, 0); | |
1139 | addr = XEXP (addr, 1); | |
1140 | } | |
1141 | else if (GET_CODE (XEXP (addr, 1)) == REG) | |
1142 | { | |
1143 | reg1 = XEXP (addr, 1); | |
1144 | addr = XEXP (addr, 0); | |
1145 | } | |
1146 | if (GET_CODE (addr) == REG || GET_CODE (addr) == MULT) | |
1147 | { | |
1148 | if (reg1 == 0) reg1 = addr; | |
1149 | else reg2 = addr; | |
1150 | addr = 0; | |
1151 | } | |
1152 | if (offset != 0) | |
1153 | { | |
1154 | if (addr != 0) abort (); | |
1155 | addr = offset; | |
1156 | } | |
1157 | if ((reg1 && GET_CODE (reg1) == MULT) | |
1158 | || (reg2 != 0 && REGNO_OK_FOR_BASE_P (REGNO (reg2)))) | |
1159 | { | |
1160 | breg = reg2; | |
1161 | ireg = reg1; | |
1162 | } | |
1163 | else if (reg1 != 0 && REGNO_OK_FOR_BASE_P (REGNO (reg1))) | |
1164 | { | |
1165 | breg = reg1; | |
1166 | ireg = reg2; | |
1167 | } | |
1168 | ||
1169 | if (ireg != 0 || breg != 0) | |
1170 | { | |
1171 | int scale = 1; | |
1172 | ||
1173 | if (addr != 0) | |
1174 | { | |
1175 | if (GET_CODE (addr) == LABEL_REF) | |
1176 | output_asm_label (addr); | |
1177 | else | |
1178 | { | |
1179 | if (flag_pic) | |
1180 | output_pic_addr_const (file, addr, 0); | |
1181 | else | |
1182 | output_addr_const (file, addr); | |
1183 | } | |
1184 | } | |
1185 | ||
1186 | if (ireg != 0 && GET_CODE (ireg) == MULT) | |
1187 | { | |
1188 | scale = INTVAL (XEXP (ireg, 1)); | |
1189 | ireg = XEXP (ireg, 0); | |
1190 | } | |
1191 | ||
1192 | /* The stack pointer can only appear as a base register, | |
1193 | never an index register, so exchange the regs if it is wrong. */ | |
1194 | ||
1195 | if (scale == 1 && ireg && REGNO (ireg) == STACK_POINTER_REGNUM) | |
1196 | { | |
1197 | rtx tmp; | |
1198 | ||
1199 | tmp = breg; | |
1200 | breg = ireg; | |
1201 | ireg = tmp; | |
1202 | } | |
1203 | ||
1204 | /* output breg+ireg*scale */ | |
1205 | PRINT_B_I_S (breg, ireg, scale, file); | |
1206 | break; | |
1207 | } | |
1208 | ||
1209 | case MULT: | |
1210 | { | |
1211 | int scale; | |
1212 | if (GET_CODE (XEXP (addr, 0)) == CONST_INT) | |
1213 | { | |
1214 | scale = INTVAL (XEXP (addr, 0)); | |
1215 | ireg = XEXP (addr, 1); | |
1216 | } | |
1217 | else | |
1218 | { | |
1219 | scale = INTVAL (XEXP (addr, 1)); | |
1220 | ireg = XEXP (addr, 0); | |
1221 | } | |
1222 | output_addr_const (file, const0_rtx); | |
1223 | PRINT_B_I_S ((rtx) 0, ireg, scale, file); | |
1224 | } | |
1225 | break; | |
1226 | ||
1227 | default: | |
1228 | if (GET_CODE (addr) == CONST_INT | |
1229 | && INTVAL (addr) < 0x8000 | |
1230 | && INTVAL (addr) >= -0x8000) | |
1231 | fprintf (file, "%d", INTVAL (addr)); | |
1232 | else | |
1233 | { | |
1234 | if (flag_pic) | |
1235 | output_pic_addr_const (file, addr, 0); | |
1236 | else | |
1237 | output_addr_const (file, addr); | |
1238 | } | |
1239 | } | |
1240 | } | |
1241 | \f | |
1242 | /* Set the cc_status for the results of an insn whose pattern is EXP. | |
1243 | On the 80386, we assume that only test and compare insns, as well | |
1244 | as SI, HI, & DI mode ADD, SUB, NEG, AND, IOR, XOR, ASHIFT, LSHIFT, | |
1245 | ASHIFTRT, and LSHIFTRT instructions set the condition codes usefully. | |
4c0d89b5 RS |
1246 | Also, we assume that jumps, moves and sCOND don't affect the condition |
1247 | codes. All else clobbers the condition codes, by assumption. | |
1248 | ||
1249 | We assume that ALL integer add, minus, etc. instructions effect the | |
1250 | condition codes. This MUST be consistent with i386.md. | |
2a2ab3f9 | 1251 | |
4c0d89b5 RS |
1252 | We don't record any float test or compare - the redundant test & |
1253 | compare check in final.c does not handle stack-like regs correctly. */ | |
2a2ab3f9 JVA |
1254 | |
1255 | void | |
1256 | notice_update_cc (exp) | |
1257 | rtx exp; | |
1258 | { | |
1259 | if (GET_CODE (exp) == SET) | |
1260 | { | |
1261 | /* Jumps do not alter the cc's. */ | |
1262 | if (SET_DEST (exp) == pc_rtx) | |
1263 | return; | |
1264 | /* Moving register or memory into a register: | |
1265 | it doesn't alter the cc's, but it might invalidate | |
1266 | the RTX's which we remember the cc's came from. | |
1267 | (Note that moving a constant 0 or 1 MAY set the cc's). */ | |
1268 | if (REG_P (SET_DEST (exp)) | |
4c0d89b5 RS |
1269 | && (REG_P (SET_SRC (exp)) || GET_CODE (SET_SRC (exp)) == MEM |
1270 | || GET_RTX_CLASS (GET_CODE (SET_SRC (exp))) == '<')) | |
2a2ab3f9 JVA |
1271 | { |
1272 | if (cc_status.value1 | |
1273 | && reg_overlap_mentioned_p (SET_DEST (exp), cc_status.value1)) | |
1274 | cc_status.value1 = 0; | |
1275 | if (cc_status.value2 | |
1276 | && reg_overlap_mentioned_p (SET_DEST (exp), cc_status.value2)) | |
1277 | cc_status.value2 = 0; | |
1278 | return; | |
1279 | } | |
1280 | /* Moving register into memory doesn't alter the cc's. | |
1281 | It may invalidate the RTX's which we remember the cc's came from. */ | |
4c0d89b5 RS |
1282 | if (GET_CODE (SET_DEST (exp)) == MEM |
1283 | && (REG_P (SET_SRC (exp)) | |
1284 | || GET_RTX_CLASS (GET_CODE (SET_SRC (exp))) == '<')) | |
2a2ab3f9 JVA |
1285 | { |
1286 | if (cc_status.value1 && GET_CODE (cc_status.value1) == MEM) | |
1287 | cc_status.value1 = 0; | |
1288 | if (cc_status.value2 && GET_CODE (cc_status.value2) == MEM) | |
1289 | cc_status.value2 = 0; | |
1290 | return; | |
1291 | } | |
1292 | /* Function calls clobber the cc's. */ | |
1293 | else if (GET_CODE (SET_SRC (exp)) == CALL) | |
1294 | { | |
1295 | CC_STATUS_INIT; | |
1296 | return; | |
1297 | } | |
1298 | /* Tests and compares set the cc's in predictable ways. */ | |
1299 | else if (SET_DEST (exp) == cc0_rtx) | |
1300 | { | |
1301 | CC_STATUS_INIT; | |
1302 | cc_status.value1 = SET_SRC (exp); | |
1303 | return; | |
1304 | } | |
1305 | /* Certain instructions effect the condition codes. */ | |
1306 | else if (GET_MODE (SET_SRC (exp)) == SImode | |
1307 | || GET_MODE (SET_SRC (exp)) == HImode | |
1308 | || GET_MODE (SET_SRC (exp)) == QImode) | |
1309 | switch (GET_CODE (SET_SRC (exp))) | |
1310 | { | |
1311 | case ASHIFTRT: case LSHIFTRT: | |
1312 | case ASHIFT: case LSHIFT: | |
1313 | /* Shifts on the 386 don't set the condition codes if the | |
1314 | shift count is zero. */ | |
1315 | if (GET_CODE (XEXP (SET_SRC (exp), 1)) != CONST_INT) | |
1316 | { | |
1317 | CC_STATUS_INIT; | |
1318 | break; | |
1319 | } | |
1320 | /* We assume that the CONST_INT is non-zero (this rtx would | |
1321 | have been deleted if it were zero. */ | |
1322 | ||
1323 | case PLUS: case MINUS: case NEG: | |
1324 | case AND: case IOR: case XOR: | |
1325 | cc_status.flags = CC_NO_OVERFLOW; | |
1326 | cc_status.value1 = SET_SRC (exp); | |
1327 | cc_status.value2 = SET_DEST (exp); | |
1328 | break; | |
1329 | ||
1330 | default: | |
1331 | CC_STATUS_INIT; | |
1332 | } | |
1333 | else | |
1334 | { | |
1335 | CC_STATUS_INIT; | |
1336 | } | |
1337 | } | |
1338 | else if (GET_CODE (exp) == PARALLEL | |
1339 | && GET_CODE (XVECEXP (exp, 0, 0)) == SET) | |
1340 | { | |
1341 | if (SET_DEST (XVECEXP (exp, 0, 0)) == pc_rtx) | |
1342 | return; | |
1343 | if (SET_DEST (XVECEXP (exp, 0, 0)) == cc0_rtx) | |
1344 | { | |
1345 | CC_STATUS_INIT; | |
4c0d89b5 RS |
1346 | if (! stack_regs_mentioned_p (SET_SRC (XVECEXP (exp, 0, 0)))) |
1347 | cc_status.value1 = SET_SRC (XVECEXP (exp, 0, 0)); | |
2a2ab3f9 JVA |
1348 | return; |
1349 | } | |
1350 | CC_STATUS_INIT; | |
1351 | } | |
1352 | else | |
1353 | { | |
1354 | CC_STATUS_INIT; | |
1355 | } | |
1356 | } | |
1357 | \f | |
1358 | /* Split one or more DImode RTL references into pairs of SImode | |
1359 | references. The RTL can be REG, offsettable MEM, integer constant, or | |
1360 | CONST_DOUBLE. "operands" is a pointer to an array of DImode RTL to | |
1361 | split and "num" is its length. lo_half and hi_half are output arrays | |
1362 | that parallel "operands". */ | |
1363 | ||
1364 | void | |
1365 | split_di (operands, num, lo_half, hi_half) | |
1366 | rtx operands[]; | |
1367 | int num; | |
1368 | rtx lo_half[], hi_half[]; | |
1369 | { | |
1370 | while (num--) | |
1371 | { | |
1372 | if (GET_CODE (operands[num]) == REG) | |
1373 | { | |
1374 | lo_half[num] = gen_rtx (REG, SImode, REGNO (operands[num])); | |
1375 | hi_half[num] = gen_rtx (REG, SImode, REGNO (operands[num]) + 1); | |
1376 | } | |
1377 | else if (CONSTANT_P (operands[num])) | |
1378 | { | |
1379 | split_double (operands[num], &lo_half[num], &hi_half[num]); | |
1380 | } | |
1381 | else if (offsettable_memref_p (operands[num])) | |
1382 | { | |
1383 | lo_half[num] = operands[num]; | |
1384 | hi_half[num] = adj_offsettable_operand (operands[num], 4); | |
1385 | } | |
1386 | else | |
1387 | abort(); | |
1388 | } | |
1389 | } | |
1390 | \f | |
1391 | /* Return 1 if this is a valid binary operation on a 387. | |
1392 | OP is the expression matched, and MODE is its mode. */ | |
1393 | ||
1394 | int | |
1395 | binary_387_op (op, mode) | |
1396 | register rtx op; | |
1397 | enum machine_mode mode; | |
1398 | { | |
1399 | if (mode != VOIDmode && mode != GET_MODE (op)) | |
1400 | return 0; | |
1401 | ||
1402 | switch (GET_CODE (op)) | |
1403 | { | |
1404 | case PLUS: | |
1405 | case MINUS: | |
1406 | case MULT: | |
1407 | case DIV: | |
1408 | return GET_MODE_CLASS (GET_MODE (op)) == MODE_FLOAT; | |
1409 | ||
1410 | default: | |
1411 | return 0; | |
1412 | } | |
1413 | } | |
1414 | ||
1415 | /* Return 1 if this is a valid conversion operation on a 387. | |
1416 | OP is the expression matched, and MODE is its mode. */ | |
1417 | ||
1418 | int | |
1419 | convert_387_op (op, mode) | |
1420 | register rtx op; | |
1421 | enum machine_mode mode; | |
1422 | { | |
1423 | if (mode != VOIDmode && mode != GET_MODE (op)) | |
1424 | return 0; | |
1425 | ||
1426 | switch (GET_CODE (op)) | |
1427 | { | |
1428 | case FLOAT: | |
1429 | return GET_MODE (XEXP (op, 0)) == SImode; | |
1430 | ||
1431 | case FLOAT_EXTEND: | |
1432 | return mode == DFmode && GET_MODE (XEXP (op, 0)) == SFmode; | |
1433 | ||
1434 | default: | |
1435 | return 0; | |
1436 | } | |
1437 | } | |
1438 | ||
1439 | /* Return 1 if this is a valid "float from int" operation on a 387. | |
1440 | OP is the expression matched, and MODE is its mode. */ | |
1441 | ||
1442 | int | |
1443 | float_op (op, mode) | |
1444 | register rtx op; | |
1445 | enum machine_mode mode; | |
1446 | { | |
1447 | if (mode != VOIDmode && mode != GET_MODE (op)) | |
1448 | return 0; | |
1449 | ||
1450 | return GET_CODE (op) == FLOAT | |
1451 | && GET_MODE_CLASS (GET_MODE (op)) == MODE_FLOAT; | |
1452 | } | |
1453 | ||
1454 | /* Return 1 if this is a valid shift or rotate operation on a 386. | |
1455 | OP is the expression matched, and MODE is its mode. */ | |
1456 | ||
1457 | int | |
1458 | shift_op (op, mode) | |
1459 | register rtx op; | |
1460 | enum machine_mode mode; | |
1461 | { | |
1462 | rtx operand = XEXP (op, 0); | |
1463 | ||
1464 | if (mode != VOIDmode && mode != GET_MODE (op)) | |
1465 | return 0; | |
1466 | ||
1467 | if (GET_MODE (operand) != GET_MODE (op) | |
1468 | || GET_MODE_CLASS (GET_MODE (op)) != MODE_INT) | |
1469 | return 0; | |
1470 | ||
1471 | return (GET_CODE (op) == ASHIFT | |
1472 | || GET_CODE (op) == ASHIFTRT | |
1473 | || GET_CODE (op) == LSHIFTRT | |
1474 | || GET_CODE (op) == ROTATE | |
1475 | || GET_CODE (op) == ROTATERT); | |
1476 | } | |
1477 | \f | |
1478 | /* Output code to perform a 387 binary operation in INSN, one of PLUS, | |
1479 | MINUS, MULT or DIV. OPERANDS are the insn operands, where operands[3] | |
1480 | is the expression of the binary operation. The output may either be | |
1481 | emitted here, or returned to the caller, like all output_* functions. | |
1482 | ||
1483 | There is no guarantee that the operands are the same mode, as they | |
1484 | might be within FLOAT or FLOAT_EXTEND expressions. */ | |
1485 | ||
1486 | char * | |
1487 | output_387_binary_op (insn, operands) | |
1488 | rtx insn; | |
1489 | rtx *operands; | |
1490 | { | |
1491 | rtx temp; | |
1492 | char *base_op; | |
1493 | static char buf[100]; | |
1494 | ||
1495 | switch (GET_CODE (operands[3])) | |
1496 | { | |
1497 | case PLUS: | |
1498 | if (GET_MODE_CLASS (GET_MODE (operands[1])) == MODE_INT | |
1499 | || GET_MODE_CLASS (GET_MODE (operands[2])) == MODE_INT) | |
1500 | base_op = "fiadd"; | |
1501 | else | |
1502 | base_op = "fadd"; | |
1503 | break; | |
1504 | ||
1505 | case MINUS: | |
1506 | if (GET_MODE_CLASS (GET_MODE (operands[1])) == MODE_INT | |
1507 | || GET_MODE_CLASS (GET_MODE (operands[2])) == MODE_INT) | |
1508 | base_op = "fisub"; | |
1509 | else | |
1510 | base_op = "fsub"; | |
1511 | break; | |
1512 | ||
1513 | case MULT: | |
1514 | if (GET_MODE_CLASS (GET_MODE (operands[1])) == MODE_INT | |
1515 | || GET_MODE_CLASS (GET_MODE (operands[2])) == MODE_INT) | |
1516 | base_op = "fimul"; | |
1517 | else | |
1518 | base_op = "fmul"; | |
1519 | break; | |
1520 | ||
1521 | case DIV: | |
1522 | if (GET_MODE_CLASS (GET_MODE (operands[1])) == MODE_INT | |
1523 | || GET_MODE_CLASS (GET_MODE (operands[2])) == MODE_INT) | |
1524 | base_op = "fidiv"; | |
1525 | else | |
1526 | base_op = "fdiv"; | |
1527 | break; | |
1528 | ||
1529 | default: | |
1530 | abort (); | |
1531 | } | |
1532 | ||
1533 | strcpy (buf, base_op); | |
1534 | ||
1535 | switch (GET_CODE (operands[3])) | |
1536 | { | |
1537 | case MULT: | |
1538 | case PLUS: | |
1539 | if (REG_P (operands[2]) && REGNO (operands[0]) == REGNO (operands[2])) | |
1540 | { | |
1541 | temp = operands[2]; | |
1542 | operands[2] = operands[1]; | |
1543 | operands[1] = temp; | |
1544 | } | |
1545 | ||
1546 | if (GET_CODE (operands[2]) == MEM) | |
1547 | return strcat (buf, AS1 (%z2,%2)); | |
1548 | ||
1549 | if (NON_STACK_REG_P (operands[1])) | |
1550 | { | |
1551 | output_op_from_reg (operands[1], strcat (buf, AS1 (%z0,%1))); | |
1552 | RET; | |
1553 | } | |
1554 | else if (NON_STACK_REG_P (operands[2])) | |
1555 | { | |
1556 | output_op_from_reg (operands[2], strcat (buf, AS1 (%z0,%1))); | |
1557 | RET; | |
1558 | } | |
1559 | ||
1560 | if (find_regno_note (insn, REG_DEAD, REGNO (operands[2]))) | |
1561 | return strcat (buf, AS2 (p,%2,%0)); | |
1562 | ||
1563 | if (STACK_TOP_P (operands[0])) | |
1564 | return strcat (buf, AS2 (,%y2,%0)); | |
1565 | else | |
1566 | return strcat (buf, AS2 (,%2,%0)); | |
1567 | ||
1568 | case MINUS: | |
1569 | case DIV: | |
1570 | if (GET_CODE (operands[1]) == MEM) | |
1571 | return strcat (buf, AS1 (r%z1,%1)); | |
1572 | ||
1573 | if (GET_CODE (operands[2]) == MEM) | |
1574 | return strcat (buf, AS1 (%z2,%2)); | |
1575 | ||
1576 | if (NON_STACK_REG_P (operands[1])) | |
1577 | { | |
1578 | output_op_from_reg (operands[1], strcat (buf, AS1 (r%z0,%1))); | |
1579 | RET; | |
1580 | } | |
1581 | else if (NON_STACK_REG_P (operands[2])) | |
1582 | { | |
1583 | output_op_from_reg (operands[2], strcat (buf, AS1 (%z0,%1))); | |
1584 | RET; | |
1585 | } | |
1586 | ||
1587 | if (! STACK_REG_P (operands[1]) || ! STACK_REG_P (operands[2])) | |
1588 | abort (); | |
1589 | ||
1590 | if (find_regno_note (insn, REG_DEAD, REGNO (operands[2]))) | |
1591 | return strcat (buf, AS2 (rp,%2,%0)); | |
1592 | ||
1593 | if (find_regno_note (insn, REG_DEAD, REGNO (operands[1]))) | |
1594 | return strcat (buf, AS2 (p,%1,%0)); | |
1595 | ||
1596 | if (STACK_TOP_P (operands[0])) | |
1597 | { | |
1598 | if (STACK_TOP_P (operands[1])) | |
1599 | return strcat (buf, AS2 (,%y2,%0)); | |
1600 | else | |
1601 | return strcat (buf, AS2 (r,%y1,%0)); | |
1602 | } | |
1603 | else if (STACK_TOP_P (operands[1])) | |
1604 | return strcat (buf, AS2 (,%1,%0)); | |
1605 | else | |
1606 | return strcat (buf, AS2 (r,%2,%0)); | |
1607 | ||
1608 | default: | |
1609 | abort (); | |
1610 | } | |
1611 | } | |
1612 | \f | |
1613 | /* Output code for INSN to convert a float to a signed int. OPERANDS | |
1614 | are the insn operands. The output may be SFmode or DFmode and the | |
1615 | input operand may be SImode or DImode. As a special case, make sure | |
1616 | that the 387 stack top dies if the output mode is DImode, because the | |
1617 | hardware requires this. */ | |
1618 | ||
1619 | char * | |
1620 | output_fix_trunc (insn, operands) | |
1621 | rtx insn; | |
1622 | rtx *operands; | |
1623 | { | |
1624 | int stack_top_dies = find_regno_note (insn, REG_DEAD, FIRST_STACK_REG) != 0; | |
1625 | rtx xops[6]; | |
1626 | ||
1627 | if (! STACK_TOP_P (operands[1]) || | |
1628 | (GET_MODE (operands[0]) == DImode && ! stack_top_dies)) | |
1629 | abort (); | |
1630 | ||
1631 | xops[0] = stack_pointer_rtx; | |
1632 | xops[1] = AT_SP (SImode); | |
1633 | xops[2] = adj_offsettable_operand (xops[1], 2); | |
1634 | xops[3] = gen_rtx (CONST_INT, VOIDmode, 4); | |
1635 | xops[4] = gen_rtx (CONST_INT, VOIDmode, 0xc00); | |
1636 | xops[5] = operands[2]; | |
1637 | ||
1638 | output_asm_insn (AS2 (sub%L0,%3,%0), xops); | |
1639 | output_asm_insn (AS1 (fnstc%W5,%1), xops); | |
1640 | output_asm_insn (AS2 (mov%W5,%1,%5), xops); | |
1641 | output_asm_insn (AS2 (or%W5,%4,%5), xops); | |
1642 | output_asm_insn (AS2 (mov%W5,%5,%2), xops); | |
1643 | output_asm_insn (AS1 (fldc%W5,%2), xops); | |
1644 | ||
1645 | if (NON_STACK_REG_P (operands[0])) | |
1646 | output_to_reg (operands[0], stack_top_dies); | |
1647 | else if (GET_CODE (operands[0]) == MEM) | |
1648 | { | |
1649 | /* If frame pointer elimination is being done, the MEM reference | |
1650 | might be an index off of the stack pointer. In that case, | |
1651 | since we have already adjusted %esp above, adjust the operand | |
1652 | address so it points where it should. */ | |
1653 | ||
1654 | if (! frame_pointer_needed | |
1655 | && reg_mentioned_p (stack_pointer_rtx, operands[0])) | |
1656 | operands[0] = adj_offsettable_operand (operands[0], 4); | |
1657 | ||
1658 | if (stack_top_dies) | |
1659 | output_asm_insn (AS1 (fistp%z0,%0), operands); | |
1660 | else | |
1661 | output_asm_insn (AS1 (fist%z0,%0), operands); | |
1662 | } | |
1663 | else | |
1664 | abort (); | |
1665 | ||
1666 | output_asm_insn (AS1 (fldc%W5,%1), xops); | |
1667 | output_asm_insn (AS2 (add%L0,%3,%0), xops); | |
1668 | ||
1669 | RET; | |
1670 | } | |
1671 | \f | |
1672 | /* Output code for INSN to compare OPERANDS. The two operands might | |
1673 | not have the same mode: one might be within a FLOAT or FLOAT_EXTEND | |
1674 | expression. */ | |
1675 | ||
1676 | char * | |
1677 | output_float_compare (insn, operands) | |
1678 | rtx insn; | |
1679 | rtx *operands; | |
1680 | { | |
1681 | int stack_top_dies; | |
1682 | ||
1683 | if (! STACK_TOP_P (operands[0])) | |
1684 | abort (); | |
1685 | ||
1686 | stack_top_dies = find_regno_note (insn, REG_DEAD, FIRST_STACK_REG) != 0; | |
1687 | ||
1688 | if (STACK_REG_P (operands[1]) | |
1689 | && stack_top_dies | |
1690 | && find_regno_note (insn, REG_DEAD, REGNO (operands[1])) | |
1691 | && REGNO (operands[1]) != FIRST_STACK_REG) | |
1692 | { | |
1693 | /* If both the top of the 387 stack dies, and the other operand | |
1694 | is also a stack register that dies, then this must be a | |
1695 | `fcompp' float compare */ | |
1696 | ||
1697 | output_asm_insn ("fcompp", operands); | |
1698 | } | |
1699 | else | |
1700 | { | |
1701 | static char buf[100]; | |
1702 | ||
1703 | /* Decide if this is the integer or float compare opcode. */ | |
1704 | ||
1705 | if (GET_MODE_CLASS (GET_MODE (operands[1])) == MODE_FLOAT) | |
1706 | strcpy (buf, "fcom"); | |
1707 | else | |
1708 | strcpy (buf, "ficom"); | |
1709 | ||
1710 | /* Modify the opcode if the 387 stack is to be popped. */ | |
1711 | ||
1712 | if (stack_top_dies) | |
1713 | strcat (buf, "p"); | |
1714 | ||
1715 | if (NON_STACK_REG_P (operands[1])) | |
1716 | output_op_from_reg (operands[1], strcat (buf, AS1 (%z0,%1))); | |
1717 | else | |
1718 | output_asm_insn (strcat (buf, AS1 (%z1,%y1)), operands); | |
1719 | } | |
1720 | ||
1721 | /* Now retrieve the condition code. */ | |
1722 | ||
1723 | output_asm_insn (AS1 (fnsts%W2,%2), operands); | |
1724 | ||
1725 | cc_status.flags |= CC_IN_80387; | |
1726 | return "sahf"; | |
1727 | } | |
1728 | \f | |
1729 | #ifdef HANDLE_PRAGMA | |
1730 | ||
1731 | /* When structure field packing is in effect, this variable is the | |
1732 | number of bits to use as the maximum alignment. When packing is not | |
1733 | in effect, this is zero. */ | |
1734 | ||
1735 | int maximum_field_alignment = 0; | |
1736 | ||
1737 | /* Handle a pragma directive. HANDLE_PRAGMA conspires to parse the | |
1738 | input following #pragma into tokens based on yylex. TOKEN is the | |
1739 | current token, and STRING is its printable form. */ | |
1740 | ||
1741 | void | |
1742 | handle_pragma_token (string, token) | |
1743 | char *string; | |
1744 | tree token; | |
1745 | { | |
1746 | static enum pragma_state | |
1747 | { | |
1748 | ps_start, | |
1749 | ps_done, | |
1750 | ps_bad, | |
1751 | ps_weak, | |
1752 | ps_name, | |
1753 | ps_equals, | |
1754 | ps_value, | |
1755 | ps_pack, | |
1756 | ps_left, | |
1757 | ps_align, | |
1758 | ps_right | |
1759 | } state = ps_start, type; | |
1760 | static char *name; | |
1761 | static char *value; | |
1762 | static int align; | |
1763 | ||
1764 | if (string == 0) | |
1765 | { | |
1766 | if (type == ps_pack) | |
1767 | { | |
1768 | if (state == ps_right) | |
1769 | maximum_field_alignment = align * 8; | |
1770 | else | |
1771 | warning ("ignoring malformed #pragma pack( [ 1 | 2 | 4 ] )"); | |
1772 | } | |
1773 | #ifdef WEAK_ASM_OP | |
1774 | else if (type == ps_weak) | |
1775 | { | |
1776 | if (state == ps_name || state == ps_value) | |
1777 | { | |
1778 | fprintf (asm_out_file, "\t%s\t", WEAK_ASM_OP); | |
1779 | ASM_OUTPUT_LABELREF (asm_out_file, name); | |
1780 | fputc ('\n', asm_out_file); | |
1781 | if (state == ps_value) | |
1782 | { | |
1783 | fprintf (asm_out_file, "\t%s\t", DEF_ASM_OP); | |
1784 | ASM_OUTPUT_LABELREF (asm_out_file, name); | |
1785 | fputc (',', asm_out_file); | |
1786 | ASM_OUTPUT_LABELREF (asm_out_file, value); | |
1787 | fputc ('\n', asm_out_file); | |
1788 | } | |
1789 | } | |
1790 | else if (! (state == ps_done || state == ps_start)) | |
1791 | warning ("ignoring malformed #pragma weak symbol [=value]"); | |
1792 | } | |
1793 | #endif /* WEAK_ASM_OP */ | |
1794 | ||
1795 | type = state = ps_start; | |
1796 | return; | |
1797 | } | |
1798 | ||
1799 | switch (state) | |
1800 | { | |
1801 | case ps_start: | |
1802 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) | |
1803 | { | |
1804 | if (strcmp (IDENTIFIER_POINTER (token), "pack") == 0) | |
1805 | type = state = ps_pack; | |
1806 | #ifdef WEAK_ASM_OP | |
1807 | else if (strcmp (IDENTIFIER_POINTER (token), "weak") == 0) | |
1808 | type = state = ps_weak; | |
1809 | #endif | |
1810 | else | |
1811 | type = state = ps_done; | |
1812 | } | |
1813 | else | |
1814 | type = state = ps_done; | |
1815 | break; | |
1816 | ||
1817 | #ifdef WEAK_ASM_OP | |
1818 | case ps_weak: | |
1819 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) | |
1820 | { | |
1821 | name = IDENTIFIER_POINTER (token); | |
1822 | state = ps_name; | |
1823 | } | |
1824 | else | |
1825 | state = ps_bad; | |
1826 | break; | |
1827 | ||
1828 | case ps_name: | |
1829 | state = (strcmp (string, "=") ? ps_bad : ps_equals); | |
1830 | break; | |
1831 | ||
1832 | case ps_equals: | |
1833 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) | |
1834 | { | |
1835 | value = IDENTIFIER_POINTER (token); | |
1836 | state = ps_value; | |
1837 | } | |
1838 | else | |
1839 | state = ps_bad; | |
1840 | break; | |
1841 | ||
1842 | case ps_value: | |
1843 | state = ps_bad; | |
1844 | break; | |
1845 | #endif /* WEAK_ASM_OP */ | |
1846 | ||
1847 | case ps_pack: | |
1848 | if (strcmp (string, "(") == 0) | |
1849 | state = ps_left; | |
1850 | else | |
1851 | state = ps_bad; | |
1852 | break; | |
1853 | ||
1854 | case ps_left: | |
1855 | if (token && TREE_CODE (token) == INTEGER_CST | |
1856 | && TREE_INT_CST_HIGH (token) == 0) | |
1857 | switch (TREE_INT_CST_LOW (token)) | |
1858 | { | |
1859 | case 1: | |
1860 | case 2: | |
1861 | case 4: | |
1862 | align = TREE_INT_CST_LOW (token); | |
1863 | state = ps_align; | |
1864 | break; | |
1865 | ||
1866 | default: | |
1867 | state = ps_bad; | |
1868 | } | |
1869 | else if (! token && strcmp (string, ")") == 0) | |
1870 | { | |
1871 | align = 0; | |
1872 | state = ps_right; | |
1873 | } | |
1874 | else | |
1875 | state = ps_bad; | |
1876 | break; | |
1877 | ||
1878 | case ps_align: | |
1879 | if (strcmp (string, ")") == 0) | |
1880 | state = ps_right; | |
1881 | else | |
1882 | state = ps_bad; | |
1883 | break; | |
1884 | ||
1885 | case ps_right: | |
1886 | state = ps_bad; | |
1887 | break; | |
1888 | ||
1889 | case ps_bad: | |
1890 | case ps_done: | |
1891 | break; | |
1892 | ||
1893 | default: | |
1894 | abort (); | |
1895 | } | |
1896 | } | |
1897 | #endif /* HANDLE_PRAGMA */ |