ia32_emitter.c 94.7 KB
Newer Older
Christian Würdig's avatar
Christian Würdig committed
1
/*
2
 * Copyright (C) 1995-2011 University of Karlsruhe.  All right reserved.
Christian Würdig's avatar
Christian Würdig committed
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
 *
 * This file is part of libFirm.
 *
 * This file may be distributed and/or modified under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation and appearing in the file LICENSE.GPL included in the
 * packaging of this file.
 *
 * Licensees holding valid libFirm Professional Edition licenses may use
 * this file in accordance with the libFirm Commercial License.
 * Agreement provided with the Software.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.
 */

20
/**
21
 * @file
Christian Würdig's avatar
Christian Würdig committed
22
23
 * @brief       This file implements the ia32 node emitter.
 * @author      Christian Wuerdig, Matthias Braun
24
25
 *
 * Summary table for x86 floatingpoint compares:
26
27
 * (remember effect of unordered on x86: ZF=1, PF=1, CF=1)
 *
28
29
30
31
32
 *   pnc_Eq  => !P && E
 *   pnc_Lt  => !P && B
 *   pnc_Le  => !P && BE
 *   pnc_Gt  => A
 *   pnc_Ge  => AE
33
 *   pnc_Lg  => NE
34
35
36
37
38
39
40
 *   pnc_Leg => NP  (ordered)
 *   pnc_Uo  => P
 *   pnc_Ue  => E
 *   pnc_Ul  => B
 *   pnc_Ule => BE
 *   pnc_Ug  => P || A
 *   pnc_Uge => P || AE
41
 *   pnc_Ne  => P || NE
42
 */
43
#include "config.h"
Christian Würdig's avatar
Christian Würdig committed
44

Christian Würdig's avatar
Christian Würdig committed
45
46
#include <limits.h>

47
#include "xmalloc.h"
48
49
#include "tv.h"
#include "iredges.h"
Christian Würdig's avatar
Christian Würdig committed
50
51
52
53
#include "debug.h"
#include "irgwalk.h"
#include "irprintf.h"
#include "irop_t.h"
Christian Würdig's avatar
Christian Würdig committed
54
#include "irargs_t.h"
55
#include "irprog_t.h"
56
#include "iredges_t.h"
57
#include "irtools.h"
58
#include "execfreq.h"
59
#include "error.h"
Matthias Braun's avatar
Matthias Braun committed
60
#include "raw_bitset.h"
61
#include "dbginfo.h"
62
#include "lc_opts.h"
63
#include "ircons.h"
Christian Würdig's avatar
Christian Würdig committed
64

65
66
67
#include "besched.h"
#include "benode.h"
#include "beabi.h"
68
#include "bedwarf.h"
69
70
71
#include "beemitter.h"
#include "begnuas.h"
#include "beirg.h"
Christian Würdig's avatar
Christian Würdig committed
72

73
#include "ia32_emitter.h"
74
#include "ia32_common_transform.h"
Christian Würdig's avatar
Christian Würdig committed
75
#include "gen_ia32_emitter.h"
Christian Würdig's avatar
Christian Würdig committed
76
#include "gen_ia32_regalloc_if.h"
77
78
#include "ia32_nodes_attr.h"
#include "ia32_new_nodes.h"
79
#include "ia32_architecture.h"
Christian Würdig's avatar
Christian Würdig committed
80
#include "bearch_ia32_t.h"
Christian Würdig's avatar
Christian Würdig committed
81

82
83
DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)

84
static const ia32_isa_t *isa;
85
static char              pic_base_label[128];
86
static ir_label_t        exc_label_id;
87
static int               mark_spill_reload = 0;
88
static int               do_pic;
89

90
91
92
93
static bool              sp_relative;
static int               frame_type_size;
static int               callframe_offset;

94
95
96
/** Return the next block in Block schedule */
static ir_node *get_prev_block_sched(const ir_node *block)
{
97
	return (ir_node*)get_irn_link(block);
98
99
}

100
/** Checks if the current block is a fall-through target. */
101
static int is_fallthrough(const ir_node *cfgpred)
102
103
104
{
	ir_node *pred;

Christoph Mallon's avatar
Christoph Mallon committed
105
	if (!is_Proj(cfgpred))
106
		return 1;
107
	pred = get_Proj_pred(cfgpred);
Christoph Mallon's avatar
Christoph Mallon committed
108
	if (is_ia32_SwitchJmp(pred))
109
		return 0;
110

111
	return 1;
112
113
}

114
115
116
117
/**
 * returns non-zero if the given block needs a label
 * because of being a jump-target (and not a fall-through)
 */
118
static int block_needs_label(const ir_node *block)
119
{
120
	int need_label = 1;
121
122
	int  n_cfgpreds = get_Block_n_cfgpreds(block);

123
	if (get_Block_entity(block) != NULL)
124
125
		return 1;

126
	if (n_cfgpreds == 0) {
127
		need_label = 0;
128
	} else if (n_cfgpreds == 1) {
Christoph Mallon's avatar
Christoph Mallon committed
129
130
		ir_node *cfgpred       = get_Block_cfgpred(block, 0);
		ir_node *cfgpred_block = get_nodes_block(cfgpred);
131
132
133

		if (get_prev_block_sched(block) == cfgpred_block
				&& is_fallthrough(cfgpred)) {
134
			need_label = 0;
135
136
137
138
139
140
		}
	}

	return need_label;
}

Michael Beck's avatar
Michael Beck committed
141
/**
142
 * Add a number to a prefix. This number will not be used a second time.
Michael Beck's avatar
Michael Beck committed
143
 */
144
145
static char *get_unique_label(char *buf, size_t buflen, const char *prefix)
{
146
	static unsigned long id = 0;
147
	snprintf(buf, buflen, "%s%s%lu", be_gas_get_private_prefix(), prefix, ++id);
148
149
150
	return buf;
}

Michael Beck's avatar
Michael Beck committed
151
152
153
/**
 * Emit the name of the 8bit low register
 */
154
155
static void emit_8bit_register(const arch_register_t *reg)
{
156
	const char *reg_name = arch_register_get_name(reg);
157
158
	assert(reg->index == REG_GP_EAX || reg->index == REG_GP_EBX
			|| reg->index == REG_GP_ECX || reg->index == REG_GP_EDX);
Christian Würdig's avatar
Christian Würdig committed
159

160
	be_emit_char('%');
161
	be_emit_char(reg_name[1]); /* get the basic name of the register */
162
163
164
	be_emit_char('l');
}

Michael Beck's avatar
Michael Beck committed
165
166
167
168
169
170
/**
 * Emit the name of the 8bit high register
 */
static void emit_8bit_register_high(const arch_register_t *reg)
{
	const char *reg_name = arch_register_get_name(reg);
171
172
	assert(reg->index == REG_GP_EAX || reg->index == REG_GP_EBX
			|| reg->index == REG_GP_ECX || reg->index == REG_GP_EDX);
Michael Beck's avatar
Michael Beck committed
173
174

	be_emit_char('%');
175
	be_emit_char(reg_name[1]); /* get the basic name of the register */
Michael Beck's avatar
Michael Beck committed
176
177
178
	be_emit_char('h');
}

179
180
static void emit_16bit_register(const arch_register_t *reg)
{
181
	const char *reg_name = arch_register_get_name(reg);
Christian Würdig's avatar
Christian Würdig committed
182

183
	be_emit_char('%');
184
	be_emit_string(reg_name+1); /* skip the 'e' prefix of the 32bit names */
185
186
}

187
188
189
190
191
192
/**
 * emit a register, possible shortened by a mode
 *
 * @param reg   the register
 * @param mode  the mode of the register or NULL for full register
 */
193
194
195
196
static void emit_register(const arch_register_t *reg, const ir_mode *mode)
{
	const char *reg_name;

Christoph Mallon's avatar
Christoph Mallon committed
197
	if (mode != NULL) {
198
		int size = get_mode_size_bits(mode);
Christoph Mallon's avatar
Christoph Mallon committed
199
200
201
		switch (size) {
			case  8: emit_8bit_register(reg);  return;
			case 16: emit_16bit_register(reg); return;
202
		}
Christoph Mallon's avatar
Christoph Mallon committed
203
		assert(mode_is_float(mode) || size == 32);
204
205
206
	}

	reg_name = arch_register_get_name(reg);
Christian Würdig's avatar
Christian Würdig committed
207

208
209
	be_emit_char('%');
	be_emit_string(reg_name);
Christian Würdig's avatar
Christian Würdig committed
210
211
}

212
213
static void ia32_emit_entity(ir_entity *entity, int no_pic_adjust)
{
214
	be_gas_emit_entity(entity);
215
216

	if (get_entity_owner(entity) == get_tls_type()) {
Matthias Braun's avatar
Matthias Braun committed
217
		if (!entity_has_definition(entity)) {
218
219
220
221
222
223
			be_emit_cstring("@INDNTPOFF");
		} else {
			be_emit_cstring("@NTPOFF");
		}
	}

224
	if (do_pic && !no_pic_adjust) {
225
226
227
228
229
230
231
232
233
234
235
236
		be_emit_char('-');
		be_emit_string(pic_base_label);
	}
}

static void emit_ia32_Immediate_no_prefix(const ir_node *node)
{
	const ia32_immediate_attr_t *attr = get_ia32_immediate_attr_const(node);

	if (attr->symconst != NULL) {
		if (attr->sc_sign)
			be_emit_char('-');
237
		ia32_emit_entity(attr->symconst, attr->no_pic_adjust);
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
	}
	if (attr->symconst == NULL || attr->offset != 0) {
		if (attr->symconst != NULL) {
			be_emit_irprintf("%+d", attr->offset);
		} else {
			be_emit_irprintf("0x%X", attr->offset);
		}
	}
}

static void emit_ia32_Immediate(const ir_node *node)
{
	be_emit_char('$');
	emit_ia32_Immediate_no_prefix(node);
}
253

Matthias Braun's avatar
Matthias Braun committed
254
static void ia32_emit_mode_suffix_mode(const ir_mode *mode)
255
{
256
257
258
259
260
	assert(mode_is_int(mode) || mode_is_reference(mode));
	switch (get_mode_size_bits(mode)) {
		case 8:  be_emit_char('b');     return;
		case 16: be_emit_char('w');     return;
		case 32: be_emit_char('l');     return;
Christoph Mallon's avatar
Christoph Mallon committed
261
262
		/* gas docu says q is the suffix but gcc, objdump and icc use ll
		 * apparently */
Matthias Braun's avatar
Matthias Braun committed
263
264
		case 64: be_emit_cstring("ll"); return;
	}
265
	panic("Can't output mode_suffix for %+F", mode);
Christian Würdig's avatar
Christian Würdig committed
266
267
}

268
static void ia32_emit_x87_mode_suffix(ir_node const *const node)
269
{
270
271
	ir_mode *mode;

272
	/* we only need to emit the mode on address mode */
273
274
275
276
277
278
279
280
	if (get_ia32_op_type(node) == ia32_Normal)
		return;

	mode = get_ia32_ls_mode(node);
	assert(mode != NULL);

	if (mode_is_float(mode)) {
		switch (get_mode_size_bits(mode)) {
281
282
283
284
285
286
287
			case  32: be_emit_char('s'); return;
			case  64: be_emit_char('l'); return;
			/* long doubles have different sizes due to alignment on different
			 * platforms. */
			case  80:
			case  96:
			case 128: be_emit_char('t'); return;
288
289
		}
	} else {
290
		assert(mode_is_int(mode) || mode_is_reference(mode));
291
292
293
294
295
296
297
		switch (get_mode_size_bits(mode)) {
			case 16: be_emit_char('s');     return;
			case 32: be_emit_char('l');     return;
			/* gas docu says q is the suffix but gcc, objdump and icc use ll
			 * apparently */
			case 64: be_emit_cstring("ll"); return;
		}
298
	}
299
	panic("Can't output mode_suffix for %+F", mode);
300
301
}

302
static char get_xmm_mode_suffix(ir_mode *mode)
303
304
{
	assert(mode_is_float(mode));
305
	switch (get_mode_size_bits(mode)) {
Christoph Mallon's avatar
Christoph Mallon committed
306
307
308
	case 32: return 's';
	case 64: return 'd';
	default: panic("Invalid XMM mode");
309
310
311
	}
}

312
static void ia32_emit_xmm_mode_suffix(ir_node const *const node)
313
314
315
{
	ir_mode *mode = get_ia32_ls_mode(node);
	assert(mode != NULL);
316
	be_emit_char(get_xmm_mode_suffix(mode));
317
318
}

Christian Würdig's avatar
Christian Würdig committed
319
/**
320
 * Returns the target block for a control flow node.
Christian Würdig's avatar
Christian Würdig committed
321
 */
322
static ir_node *get_cfop_target_block(const ir_node *irn)
Christoph Mallon's avatar
Christoph Mallon committed
323
{
324
	assert(get_irn_mode(irn) == mode_X);
325
	return (ir_node*)get_irn_link(irn);
326
}
Christian Würdig's avatar
Christian Würdig committed
327

328
329
330
331
332
333
/**
 * Emits the target label for a control flow node.
 */
static void ia32_emit_cfop_target(const ir_node *node)
{
	ir_node *block = get_cfop_target_block(node);
334
	be_gas_emit_block_name(block);
335
336
}

Michael Beck's avatar
Michael Beck committed
337
338
339
/**
 * Emit the suffix for a compare instruction.
 */
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
static void ia32_emit_condition_code(ia32_condition_code_t cc)
{
	switch (cc) {
	case ia32_cc_overflow:      be_emit_cstring("o");  return;
	case ia32_cc_not_overflow:  be_emit_cstring("no"); return;
	case ia32_cc_float_below:
	case ia32_cc_float_unordered_below:
	case ia32_cc_below:         be_emit_cstring("b");  return;
	case ia32_cc_float_above_equal:
	case ia32_cc_float_unordered_above_equal:
	case ia32_cc_above_equal:   be_emit_cstring("ae"); return;
	case ia32_cc_float_equal:
	case ia32_cc_equal:         be_emit_cstring("e");  return;
	case ia32_cc_float_not_equal:
	case ia32_cc_not_equal:     be_emit_cstring("ne"); return;
	case ia32_cc_float_below_equal:
	case ia32_cc_float_unordered_below_equal:
	case ia32_cc_below_equal:   be_emit_cstring("be"); return;
	case ia32_cc_float_above:
	case ia32_cc_float_unordered_above:
	case ia32_cc_above:         be_emit_cstring("a");  return;
	case ia32_cc_sign:          be_emit_cstring("s");  return;
	case ia32_cc_not_sign:      be_emit_cstring("ns"); return;
	case ia32_cc_parity:        be_emit_cstring("p");  return;
	case ia32_cc_not_parity:    be_emit_cstring("np"); return;
	case ia32_cc_less:          be_emit_cstring("l");  return;
	case ia32_cc_greater_equal: be_emit_cstring("ge"); return;
	case ia32_cc_less_equal:    be_emit_cstring("le"); return;
	case ia32_cc_greater:       be_emit_cstring("g");  return;
	case ia32_cc_float_parity_cases:
	case ia32_cc_additional_float_cases:
		break;
372
	}
373
	panic("Invalid ia32 condition code");
374
375
}

376
typedef enum ia32_emit_mod_t {
377
	EMIT_NONE         = 0,
378
	EMIT_RESPECT_LS   = 1U << 0,
379
	EMIT_ALTERNATE_AM = 1U << 1,
380
381
	EMIT_LONG         = 1U << 2,
	EMIT_HIGH_REG     = 1U << 3,
382
383
	EMIT_LOW_REG      = 1U << 4,
	EMIT_16BIT_REG    = 1U << 5
384
} ia32_emit_mod_t;
385
ENUM_BITSET(ia32_emit_mod_t)
386

387
388
389
/**
 * Emits address mode.
 */
390
static void ia32_emit_am(ir_node const *const node)
391
392
393
394
395
{
	ir_entity *ent       = get_ia32_am_sc(node);
	int        offs      = get_ia32_am_offs_int(node);
	ir_node   *base      = get_irn_n(node, n_ia32_base);
	int        has_base  = !is_ia32_NoReg_GP(base);
396
397
	ir_node   *idx       = get_irn_n(node, n_ia32_index);
	int        has_index = !is_ia32_NoReg_GP(idx);
398
399
400
401

	/* just to be sure... */
	assert(!is_ia32_use_frame(node) || get_ia32_frame_ent(node) != NULL);

402
403
404
	if (get_ia32_am_tls_segment(node))
		be_emit_cstring("%gs:");

405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
	/* emit offset */
	if (ent != NULL) {
		const ia32_attr_t *attr = get_ia32_attr_const(node);
		if (is_ia32_am_sc_sign(node))
			be_emit_char('-');
		ia32_emit_entity(ent, attr->data.am_sc_no_pic_adjust);
	}

	/* also handle special case if nothing is set */
	if (offs != 0 || (ent == NULL && !has_base && !has_index)) {
		if (ent != NULL) {
			be_emit_irprintf("%+d", offs);
		} else {
			be_emit_irprintf("%d", offs);
		}
	}

	if (has_base || has_index) {
		be_emit_char('(');

		/* emit base */
		if (has_base) {
427
			const arch_register_t *reg = arch_get_irn_register_in(node, n_ia32_base);
428
429
430
431
432
			emit_register(reg, NULL);
		}

		/* emit index + scale */
		if (has_index) {
433
			const arch_register_t *reg = arch_get_irn_register_in(node, n_ia32_index);
434
435
436
437
438
439
440
441
442
443
444
445
446
			int scale;
			be_emit_char(',');
			emit_register(reg, NULL);

			scale = get_ia32_am_scale(node);
			if (scale > 0) {
				be_emit_irprintf(",%d", 1 << scale);
			}
		}
		be_emit_char(')');
	}
}

447
448
449
static ia32_condition_code_t determine_final_cc(ir_node const *node, int flags_pos, ia32_condition_code_t cc);

void ia32_emitf(ir_node const *const node, char const *fmt, ...)
450
451
452
453
{
	va_list ap;
	va_start(ap, fmt);

454
	be_emit_char('\t');
455
	for (;;) {
456
		const char      *start = fmt;
457
		ia32_emit_mod_t  mod   = EMIT_NONE;
458
459
460
461
462
463
464
465

		while (*fmt != '%' && *fmt != '\n' && *fmt != '\0')
			++fmt;
		if (fmt != start) {
			be_emit_string_len(start, fmt - start);
		}

		if (*fmt == '\n') {
466
467
468
			be_emit_char('\n');
			be_emit_write_line();
			be_emit_char('\t');
469
470
471
472
473
474
475
			++fmt;
			if (*fmt == '\0')
				break;
			continue;
		}

		if (*fmt == '\0')
Christian Würdig's avatar
Christian Würdig committed
476
			break;
477
478

		++fmt;
479
480
		for (;;) {
			switch (*fmt) {
481
482
483
			case '*': mod |= EMIT_ALTERNATE_AM; break;
			case '#': mod |= EMIT_RESPECT_LS;   break;
			case 'l': mod |= EMIT_LONG;         break;
484
485
			case '>': mod |= EMIT_HIGH_REG;     break;
			case '<': mod |= EMIT_LOW_REG;      break;
486
			case '^': mod |= EMIT_16BIT_REG;    break;
487
488
489
			default:
				goto end_of_mods;
			}
490
491
			++fmt;
		}
492
end_of_mods:
493

494
		switch (*fmt++) {
495
496
497
			arch_register_t const *reg;
			ir_node         const *imm;

498
499
500
501
502
503
			case '%':
				be_emit_char('%');
				break;

			case 'A': {
				switch (*fmt++) {
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
					case 'F':
						if (get_ia32_op_type(node) == ia32_AddrModeS) {
							goto emit_AM;
						} else {
							assert(get_ia32_op_type(node) == ia32_Normal);
							ia32_x87_attr_t const *const x87_attr = get_ia32_x87_attr_const(node);
							arch_register_t const *const in1      = x87_attr->x87[0];
							arch_register_t const *      in       = x87_attr->x87[1];
							arch_register_t const *      out      = x87_attr->x87[2];
							if (out == NULL) {
								out = in1;
							} else if (out == in) {
								in = in1;
							}
							be_emit_irprintf("%%%s, %%%s", arch_register_get_name(in), arch_register_get_name(out));
							break;
						}

522
emit_AM:
523
					case 'M':
524
525
						if (mod & EMIT_ALTERNATE_AM)
							be_emit_char('*');
526
527
528
						ia32_emit_am(node);
						break;

529
530
					case 'R':
						reg = va_arg(ap, const arch_register_t*);
531
						if (get_ia32_op_type(node) == ia32_AddrModeS) {
532
							goto emit_AM;
533
						} else {
534
							goto emit_R;
535
536
537
538
539
						}

					case 'S':
						if (get_ia32_op_type(node) == ia32_AddrModeS) {
							++fmt;
540
							goto emit_AM;
541
542
543
544
545
546
547
548
549
550
						} else {
							assert(get_ia32_op_type(node) == ia32_Normal);
							goto emit_S;
						}

					default: goto unknown;
				}
				break;
			}

551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
			case 'B':
				imm = get_irn_n(node, n_ia32_binary_right);
				if (is_ia32_Immediate(imm)) {
					emit_ia32_Immediate(imm);
					be_emit_cstring(", ");
					if (get_ia32_op_type(node) == ia32_AddrModeS) {
						ia32_emit_am(node);
					} else {
						assert(get_ia32_op_type(node) == ia32_Normal);
						reg = arch_get_irn_register_in(node, n_ia32_binary_left);
						emit_register(reg, get_ia32_ls_mode(node));
					}
				} else {
					if (get_ia32_op_type(node) == ia32_AddrModeS) {
						ia32_emit_am(node);
					} else {
						assert(get_ia32_op_type(node) == ia32_Normal);
						reg = arch_get_irn_register_in(node, n_ia32_binary_right);
						emit_register(reg, get_ia32_ls_mode(node));
					}
					be_emit_cstring(", ");
					reg = arch_get_irn_register_in(node, n_ia32_binary_left);
					emit_register(reg, get_ia32_ls_mode(node));
				}
				break;

577
			case 'D':
578
579
				if (*fmt < '0' || '9' <= *fmt)
					goto unknown;
580
				reg = arch_get_irn_register_out(node, *fmt++ - '0');
581
				goto emit_R;
582

583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
			case 'F':
				if (*fmt == 'M') {
					++fmt;
					ia32_emit_x87_mode_suffix(node);
				} else if (*fmt == 'X') {
					++fmt;
					ia32_emit_xmm_mode_suffix(node);
				} else if ('0' <= *fmt && *fmt <= '3') {
					const ia32_x87_attr_t *attr = get_ia32_x87_attr_const(node);
					be_emit_char('%');
					be_emit_string(attr->x87[*fmt++ - '0']->name);
				} else {
					goto unknown;
				}
				break;

599
			case 'I':
600
601
				imm = node;
emit_I:
602
603
				if (!(mod & EMIT_ALTERNATE_AM))
					be_emit_char('$');
604
				emit_ia32_Immediate_no_prefix(imm);
605
606
607
608
609
610
				break;

			case 'L':
				ia32_emit_cfop_target(node);
				break;

611
612
613
614
615
616
617
618
619
620
			case 'M': {
				ir_mode *mode = get_ia32_ls_mode(node);
				if (!mode)
					mode = mode_Iu;
				if (mod & EMIT_RESPECT_LS) {
					if (get_mode_size_bits(mode) == 32)
						break;
					be_emit_char(mode_is_signed(mode) ? 's' : 'z');
				}
				ia32_emit_mode_suffix_mode(mode);
621
				break;
622
			}
623
624

			case 'P': {
625
626
627
628
629
630
631
632
633
634
				ia32_condition_code_t cc;
				if (*fmt == 'X') {
					++fmt;
					cc = (ia32_condition_code_t)va_arg(ap, int);
				} else if ('0' <= *fmt && *fmt <= '9') {
					cc = get_ia32_condcode(node);
					cc = determine_final_cc(node, *fmt - '0', cc);
				} else {
					goto unknown;
				}
635
				ia32_emit_condition_code(cc);
636
637
638
				break;
			}

639
640
641
642
643
			case 'R':
				reg = va_arg(ap, const arch_register_t*);
emit_R:
				if (mod & EMIT_ALTERNATE_AM)
					be_emit_char('*');
644
645
646
647
				if (mod & EMIT_HIGH_REG) {
					emit_8bit_register_high(reg);
				} else if (mod & EMIT_LOW_REG) {
					emit_8bit_register(reg);
648
649
				} else if (mod & EMIT_16BIT_REG) {
					emit_16bit_register(reg);
650
651
652
				} else {
					emit_register(reg, mod & EMIT_RESPECT_LS ? get_ia32_ls_mode(node) : NULL);
				}
653
654
655
656
				break;

emit_S:
			case 'S': {
657
				unsigned pos;
658
659
660
661
662

				if (*fmt < '0' || '9' <= *fmt)
					goto unknown;

				pos = *fmt++ - '0';
663
664
665
				imm = get_irn_n(node, pos);
				if (is_ia32_Immediate(imm)) {
					goto emit_I;
666
				} else {
667
					reg = arch_get_irn_register_in(node, pos);
668
					goto emit_R;
669
670
671
672
673
674
675
676
677
				}
			}

			case 's': {
				const char *str = va_arg(ap, const char*);
				be_emit_string(str);
				break;
			}

678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
			case 'u':
				if (mod & EMIT_LONG) {
					unsigned long num = va_arg(ap, unsigned long);
					be_emit_irprintf("%lu", num);
				} else {
					unsigned num = va_arg(ap, unsigned);
					be_emit_irprintf("%u", num);
				}
				break;

			case 'd':
				if (mod & EMIT_LONG) {
					long num = va_arg(ap, long);
					be_emit_irprintf("%ld", num);
				} else {
					int num = va_arg(ap, int);
					be_emit_irprintf("%d", num);
				}
696
697
698
699
				break;

			default:
unknown:
700
				panic("unknown format conversion in ia32_emitf()");
701
		}
702
703
	}

704
	be_emit_finish_line_gas(node);
705
706
707
	va_end(ap);
}

Matthias Braun's avatar
Matthias Braun committed
708
709
710
static void emit_ia32_IMul(const ir_node *node)
{
	ir_node               *left    = get_irn_n(node, n_ia32_IMul_left);
711
	const arch_register_t *out_reg = arch_get_irn_register_out(node, pn_ia32_IMul_res);
Matthias Braun's avatar
Matthias Braun committed
712
713

	/* do we need the 3-address form? */
Christoph Mallon's avatar
Christoph Mallon committed
714
	if (is_ia32_NoReg_GP(left) ||
715
			arch_get_irn_register_in(node, n_ia32_IMul_left) != out_reg) {
716
		ia32_emitf(node, "imul%M %#S4, %#AS3, %#D0");
717
	} else {
718
		ia32_emitf(node, "imul%M %#AS4, %#S3");
Matthias Braun's avatar
Matthias Braun committed
719
720
721
	}
}

722
723
724
/**
 * walks up a tree of copies/perms/spills/reloads to find the original value
 * that is moved around
725
 */
726
727
static ir_node *find_original_value(ir_node *node)
{
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
	if (irn_visited(node))
		return NULL;

	mark_irn_visited(node);
	if (be_is_Copy(node)) {
		return find_original_value(be_get_Copy_op(node));
	} else if (be_is_CopyKeep(node)) {
		return find_original_value(be_get_CopyKeep_op(node));
	} else if (is_Proj(node)) {
		ir_node *pred = get_Proj_pred(node);
		if (be_is_Perm(pred)) {
			return find_original_value(get_irn_n(pred, get_Proj_proj(node)));
		} else if (be_is_MemPerm(pred)) {
			return find_original_value(get_irn_n(pred, get_Proj_proj(node) + 1));
		} else if (is_ia32_Load(pred)) {
			return find_original_value(get_irn_n(pred, n_ia32_Load_mem));
Andreas Zwinkau's avatar
Andreas Zwinkau committed
744
745
		} else if (is_ia32_Store(pred)) {
			return find_original_value(get_irn_n(pred, n_ia32_Store_val));
746
747
748
		} else {
			return node;
		}
749
750
751
752
753
754
755
756
757
758
759
760
761
	} else if (is_Phi(node)) {
		int i, arity;
		arity = get_irn_arity(node);
		for (i = 0; i < arity; ++i) {
			ir_node *in  = get_irn_n(node, i);
			ir_node *res = find_original_value(in);

			if (res != NULL)
				return res;
		}
		return NULL;
	} else {
		return node;
762
763
764
	}
}

765
766
static ia32_condition_code_t determine_final_cc(const ir_node *node,
		int flags_pos, ia32_condition_code_t cc)
767
{
768
769
770
771
	ir_node           *flags = get_irn_n(node, flags_pos);
	const ia32_attr_t *flags_attr;
	flags = skip_Proj(flags);

Christoph Mallon's avatar
Christoph Mallon committed
772
	if (is_ia32_Sahf(flags)) {
773
		ir_node *cmp = get_irn_n(flags, n_ia32_Sahf_val);
Christoph Mallon's avatar
Christoph Mallon committed
774
		if (!(is_ia32_FucomFnstsw(cmp) || is_ia32_FucompFnstsw(cmp)
775
				|| is_ia32_FucomppFnstsw(cmp) || is_ia32_FtstFnstsw(cmp))) {
776
			inc_irg_visited(current_ir_graph);
777
			cmp = find_original_value(cmp);
778
			assert(cmp != NULL);
779
			assert(is_ia32_FucomFnstsw(cmp) || is_ia32_FucompFnstsw(cmp)
780
			       || is_ia32_FucomppFnstsw(cmp) || is_ia32_FtstFnstsw(cmp));
781
		}
782

783
		flags_attr = get_ia32_attr_const(cmp);
784
	} else {
785
		flags_attr = get_ia32_attr_const(flags);
786
	}
787

788
789
790
	if (flags_attr->data.ins_permuted)
		cc = ia32_invert_condition_code(cc);
	return cc;
791
792
}

793
794
795
796
797
798
/**
 * Emits an exception label for a given node.
 */
static void ia32_emit_exc_label(const ir_node *node)
{
	be_emit_string(be_gas_insn_label_prefix());
799
	be_emit_irprintf("%lu", get_ia32_exc_label_id(node));
800
801
}

802
803
804
/**
 * Returns the Proj with projection number proj and NOT mode_M
 */
Christoph Mallon's avatar
Christoph Mallon committed
805
806
static ir_node *get_proj(const ir_node *node, long proj)
{
807
	ir_node *src;
808

809
	assert(get_irn_mode(node) == mode_T && "expected mode_T node");
810

811
	foreach_out_edge(node, edge) {
812
813
814
815
816
817
818
819
820
821
822
823
		src = get_edge_src_irn(edge);

		assert(is_Proj(src) && "Proj expected");
		if (get_irn_mode(src) == mode_M)
			continue;

		if (get_Proj_proj(src) == proj)
			return src;
	}
	return NULL;
}

824
static int can_be_fallthrough(const ir_node *node)
825
826
827
828
829
830
{
	ir_node *target_block = get_cfop_target_block(node);
	ir_node *block        = get_nodes_block(node);
	return get_prev_block_sched(target_block) == block;
}

Christian Würdig's avatar
Christian Würdig committed
831
832
833
/**
 * Emits the jump sequence for a conditional jump (cmp + jmp_true + jmp_false)
 */
834
static void emit_ia32_Jcc(const ir_node *node)
835
{
836
837
838
839
	int                   need_parity_label = 0;
	ia32_condition_code_t cc                = get_ia32_condcode(node);
	const ir_node        *proj_true;
	const ir_node        *proj_false;
Christian Würdig's avatar
Christian Würdig committed
840

841
	cc = determine_final_cc(node, 0, cc);
Christian Würdig's avatar
Christian Würdig committed
842

843
844
845
	/* get both Projs */
	proj_true = get_proj(node, pn_ia32_Jcc_true);
	assert(proj_true && "Jcc without true Proj");
846

847
848
	proj_false = get_proj(node, pn_ia32_Jcc_false);
	assert(proj_false && "Jcc without false Proj");
849

850
	if (can_be_fallthrough(proj_true)) {
851
		/* exchange both proj's so the second one can be omitted */
852
853
		const ir_node *t = proj_true;

854
855
		proj_true  = proj_false;
		proj_false = t;
856
		cc         = ia32_negate_condition_code(cc);
857
858
	}

859
	if (cc & ia32_cc_float_parity_cases) {
860
861
		/* Some floating point comparisons require a test of the parity flag,
		 * which indicates that the result is unordered */
862
		if (cc & ia32_cc_negated) {
863
			ia32_emitf(proj_true, "jp %L");
864
		} else {
865
866
867
868
			/* we need a local label if the false proj is a fallthrough
			 * as the falseblock might have no label emitted then */
			if (can_be_fallthrough(proj_false)) {
				need_parity_label = 1;
869
				ia32_emitf(proj_false, "jp 1f");
870
			} else {
871
				ia32_emitf(proj_false, "jp %L");
872
			}
873
		}
874
	}
875
	ia32_emitf(proj_true, "j%PX %L", (int)cc);
Christoph Mallon's avatar
Christoph Mallon committed
876
	if (need_parity_label) {
877
878
		be_emit_cstring("1:\n");
		be_emit_write_line();
879
880
	}

881
	/* the second Proj might be a fallthrough */
Matthias Braun's avatar
Matthias Braun committed
882
	if (can_be_fallthrough(proj_false)) {
883
		if (be_options.verbose_asm)
884
			ia32_emitf(proj_false, "/* fallthrough to %L */");
885
	} else {
886
		ia32_emitf(proj_false, "jmp %L");
887
	}
Michael Beck's avatar
Michael Beck committed
888
889
}

890
891
892
893
894
895
/**
 * Emits an ia32 Setcc. This is mostly easy but some floating point compares
 * are tricky.
 */
static void emit_ia32_Setcc(const ir_node *node)
{
896
	const arch_register_t *dreg = arch_get_irn_register_out(node, pn_ia32_Setcc_res);
897

898
899
900
901
	ia32_condition_code_t cc = get_ia32_condcode(node);
	cc = determine_final_cc(node, n_ia32_Setcc_eflags, cc);
	if (cc & ia32_cc_float_parity_cases) {
		if (cc & ia32_cc_negated) {
902
903
904
			ia32_emitf(node, "set%PX %<R", (int)cc, dreg);
			ia32_emitf(node, "setp %>R", dreg);
			ia32_emitf(node, "orb %>R, %<R", dreg, dreg);
905
		} else {
906
907
908
			ia32_emitf(node, "set%PX %<R", (int)cc, dreg);
			ia32_emitf(node, "setnp %>R", dreg);
			ia32_emitf(node, "andb %>R, %<R", dreg, dreg);
909
		}
910
	} else {
911
		ia32_emitf(node, "set%PX %#R", (int)cc, dreg);
912
913
914
915
	}
}

static void emit_ia32_CMovcc(const ir_node *node)
Matthias Braun's avatar
Matthias Braun committed
916
{
917
	const ia32_attr_t     *attr = get_ia32_attr_const(node);
918
	const arch_register_t *out  = arch_get_irn_register_out(node, pn_ia32_res);
919
	ia32_condition_code_t  cc   = get_ia32_condcode(node);
920
921
922
	const arch_register_t *in_true;
	const arch_register_t *in_false;

923
	cc = determine_final_cc(node, n_ia32_CMovcc_eflags, cc);
924
	/* although you can't set ins_permuted in the constructor it might still
925
926
927
	 * be set by memory operand folding
	 * Permuting inputs of a cmov means the condition is negated!
	 */
928
	if (attr->data.ins_permuted)
929
		cc = ia32_negate_condition_code(cc);
930

931
932
	in_true  = arch_get_irn_register(get_irn_n(node, n_ia32_CMovcc_val_true));
	in_false = arch_get_irn_register(get_irn_n(node, n_ia32_CMovcc_val_false));
933
934

	/* should be same constraint fullfilled? */
Christoph Mallon's avatar
Christoph Mallon committed
935
	if (out == in_false) {
936
		/* yes -> nothing to do */
Christoph Mallon's avatar
Christoph Mallon committed
937
	} else if (out == in_true) {
938
939
		const arch_register_t *tmp;

940
941
		assert(get_ia32_op_type(node) == ia32_Normal);

942
		cc = ia32_negate_condition_code(cc);
943
944
945
946

		tmp      = in_true;
		in_true  = in_false;
		in_false = tmp;
947
	} else {
948
		/* we need a mov */
949
		ia32_emitf(node, "movl %R, %R", in_false, out);
950
	}
951

952
953
	if (cc & ia32_cc_float_parity_cases) {
		panic("CMov with floatingpoint compare/parity not supported yet");
954
	}
955

956
	ia32_emitf(node, "cmov%PX %#AR, %#R", (int)cc, in_true, out);
957
958
}

959
/**
960
 * Emits code for a SwitchJmp
961
962
963
 */
static void emit_ia32_SwitchJmp(const ir_node *node)
{
Matthias Braun's avatar
Matthias Braun committed
964
965
	ir_entity             *jump_table = get_ia32_am_sc(node);
	const ir_switch_table *table      = get_ia32_switch_table(node);
Christian Würdig's avatar
Christian Würdig committed
966

967
	ia32_emitf(node, "jmp %*AM");
Matthias Braun's avatar
Matthias Braun committed
968
	be_emit_jump_table(node, table, jump_table, get_cfop_target_block);
Christian Würdig's avatar
Christian Würdig committed
969
970
971
972
973
}

/**
 * Emits code for a unconditional jump.
 */
974
static void emit_ia32_Jmp(const ir_node *node)
975
{
976
	/* we have a block schedule */
977
	if (can_be_fallthrough(node)) {
978
		if (be_options.verbose_asm)
979
			ia32_emitf(node, "/* fallthrough to %L */");
980
	} else {
981
		ia32_emitf(node, "jmp %L");
Christian Würdig's avatar
Christian Würdig committed
982
983
984
	}
}

Michael Beck's avatar
Michael Beck committed
985
986
987
988
989
990
991
992
/**
 * Emit an inline assembler operand.
 *
 * @param node  the ia32_ASM node
 * @param s     points to the operand (a %c)
 *
 * @return  pointer to the first char in s NOT in the current operand
 */
993
static const char* emit_asm_operand(const ir_node *node, const char *s)
994
{
995
996
997
	const ia32_attr_t     *ia32_attr = get_ia32_attr_const(node);
	const ia32_asm_attr_t *attr      = CONST_CAST_IA32_ATTR(ia32_asm_attr_t,
                                                            ia32_attr);
998
	const arch_register_t *reg;
999
1000
	const ia32_asm_reg_t  *asm_regs = attr->register_map;
	const ia32_asm_reg_t  *asm_reg;
1001
1002
	char                   c;
	char                   modifier = 0;
1003
	int                    num;
1004
	int                    p;
1005
1006
1007
1008
1009

	assert(*s == '%');
	c = *(++s);

	/* parse modifiers */
1010
	switch (c) {
1011
	case 0:
1012
		ir_fprintf(stderr, "Warning: asm text (%+F) ends with %%\n", node);
1013
		be_emit_char('%');