ia32_emitter.c 82.9 KB
Newer Older
Christian Würdig's avatar
Christian Würdig committed
1
2
/*
 * This file is part of libFirm.
3
 * Copyright (C) 2012 University of Karlsruhe.
Christian Würdig's avatar
Christian Würdig committed
4
5
 */

6
/**
7
 * @file
Christian Würdig's avatar
Christian Würdig committed
8
9
 * @brief       This file implements the ia32 node emitter.
 * @author      Christian Wuerdig, Matthias Braun
10
11
 *
 * Summary table for x86 floatingpoint compares:
12
13
 * (remember effect of unordered on x86: ZF=1, PF=1, CF=1)
 *
14
15
16
17
18
 *   pnc_Eq  => !P && E
 *   pnc_Lt  => !P && B
 *   pnc_Le  => !P && BE
 *   pnc_Gt  => A
 *   pnc_Ge  => AE
19
 *   pnc_Lg  => NE
20
21
22
23
24
25
26
 *   pnc_Leg => NP  (ordered)
 *   pnc_Uo  => P
 *   pnc_Ue  => E
 *   pnc_Ul  => B
 *   pnc_Ule => BE
 *   pnc_Ug  => P || A
 *   pnc_Uge => P || AE
27
 *   pnc_Ne  => P || NE
28
 */
29
#include <inttypes.h>
Christian Würdig's avatar
Christian Würdig committed
30

31
32
#include "be_t.h"
#include "bearch_ia32_t.h"
33
#include "beblocksched.h"
34
#include "bediagnostic.h"
35
#include "begnuas.h"
36
#include "besched.h"
37
#include "bestack.h"
38
#include "beutil.h"
39
#include "execfreq.h"
Christian Würdig's avatar
Christian Würdig committed
40
#include "gen_ia32_emitter.h"
Christian Würdig's avatar
Christian Würdig committed
41
#include "gen_ia32_regalloc_if.h"
42
#include "ia32_architecture.h"
43
44
45
46
47
48
#include "ia32_emitter.h"
#include "ia32_new_nodes.h"
#include "irgwalk.h"
#include "irtools.h"
#include "lc_opts.h"
#include "panic.h"
Christian Würdig's avatar
Christian Würdig committed
49

50
51
DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)

52
53
54
static char       pic_base_label[128];
static ir_label_t exc_label_id;
static bool       mark_spill_reload;
55

56
57
58
static bool       sp_relative;
static int        frame_type_size;
static int        callframe_offset;
59

60
61
62
/** Return the next block in Block schedule */
static ir_node *get_prev_block_sched(const ir_node *block)
{
63
	return (ir_node*)get_irn_link(block);
64
65
}

66
/** Checks if the current block is a fall-through target. */
67
static bool is_fallthrough(const ir_node *cfgpred)
68
{
Christoph Mallon's avatar
Christoph Mallon committed
69
	if (!is_Proj(cfgpred))
70
71
		return true;
	ir_node *pred = get_Proj_pred(cfgpred);
Christoph Mallon's avatar
Christoph Mallon committed
72
	if (is_ia32_SwitchJmp(pred))
73
74
		return false;
	return true;
75
76
}

77
78
79
80
/**
 * returns non-zero if the given block needs a label
 * because of being a jump-target (and not a fall-through)
 */
81
static bool block_needs_label(const ir_node *block)
82
{
83
	if (get_Block_entity(block) != NULL)
84
		return true;
85

86
87
	int  n_cfgpreds = get_Block_n_cfgpreds(block);
	bool need_label = true;
88
	if (n_cfgpreds == 0) {
89
		need_label = 0;
90
	} else if (n_cfgpreds == 1) {
Christoph Mallon's avatar
Christoph Mallon committed
91
92
		ir_node *cfgpred       = get_Block_cfgpred(block, 0);
		ir_node *cfgpred_block = get_nodes_block(cfgpred);
93
		if (get_prev_block_sched(block) == cfgpred_block
94
		    && is_fallthrough(cfgpred)) {
95
			need_label = 0;
96
97
98
99
100
101
		}
	}

	return need_label;
}

Michael Beck's avatar
Michael Beck committed
102
/**
103
 * Add a number to a prefix. This number will not be used a second time.
Michael Beck's avatar
Michael Beck committed
104
 */
105
106
static char *get_unique_label(char *buf, size_t buflen, const char *prefix)
{
107
	static unsigned long id = 0;
108
	snprintf(buf, buflen, "%s%s%lu", be_gas_get_private_prefix(), prefix, ++id);
109
110
111
	return buf;
}

112
static const char *get_register_name_8bit_low(const arch_register_t *reg)
113
{
114
115
116
117
118
119
120
	switch (reg->global_index) {
	case REG_EAX: return "al";
	case REG_EBX: return "bl";
	case REG_ECX: return "cl";
	case REG_EDX: return "dl";
	}
	panic("unexpected register");
121
122
}

123
static const char *get_register_name_8bit_high(const arch_register_t *reg)
Michael Beck's avatar
Michael Beck committed
124
{
125
126
127
128
129
130
131
132
	switch (reg->global_index) {
	case REG_EAX: return "ah";
	case REG_EBX: return "bh";
	case REG_ECX: return "ch";
	case REG_EDX: return "dh";
	}
	panic("unexpected register");
}
Michael Beck's avatar
Michael Beck committed
133

134
135
136
137
138
139
140
141
142
143
144
145
146
static const char *get_register_name_16bit(const arch_register_t *reg)
{
	switch (reg->global_index) {
	case REG_EAX: return "ax";
	case REG_EBX: return "bx";
	case REG_ECX: return "cx";
	case REG_EDX: return "dx";
	case REG_ESI: return "si";
	case REG_EDI: return "di";
	case REG_ESP: return "sp";
	case REG_EBP: return "bp";
	}
	panic("unexpected register");
Michael Beck's avatar
Michael Beck committed
147
148
}

149
150
static const char *get_register_name_mode(const arch_register_t *reg,
                                          ir_mode *mode)
151
{
152
153
154
155
156
157
158
159
160
	if (mode == NULL)
		return reg->name;
	unsigned size = get_mode_size_bits(mode);
	if (size == 8)
		return get_register_name_8bit_low(reg);
	else if (size == 16)
		return get_register_name_16bit(reg);
	else
		return reg->name;
161
162
}

163
164
165
166
167
/**
 * emit a register, possible shortened by a mode
 * @param reg   the register
 * @param mode  the mode of the register or NULL for full register
 */
168
static void emit_register(const arch_register_t *reg, ir_mode *mode)
169
{
170
	const char *name = get_register_name_mode(reg, mode);
171
	be_emit_char('%');
172
	be_emit_string(name);
Christian Würdig's avatar
Christian Würdig committed
173
174
}

175
176
static void ia32_emit_entity(ir_entity *entity, int no_pic_adjust)
{
177
	be_gas_emit_entity(entity);
178

179
	if (is_tls_entity(entity)) {
Matthias Braun's avatar
Matthias Braun committed
180
		if (!entity_has_definition(entity)) {
181
182
183
184
185
186
			be_emit_cstring("@INDNTPOFF");
		} else {
			be_emit_cstring("@NTPOFF");
		}
	}

187
	if (be_options.pic && !no_pic_adjust && get_entity_type(entity) != get_code_type()) {
188
189
190
191
192
		be_emit_char('-');
		be_emit_string(pic_base_label);
	}
}

193
static void emit_ia32_immediate(bool const prefix, bool const no_pic_adjust, ir_entity *const entity, int32_t const offset)
194
{
195
196
197
198
199
200
	if (prefix)
		be_emit_char('$');
	if (entity) {
		ia32_emit_entity(entity, no_pic_adjust);
		if (offset != 0)
			be_emit_irprintf("%+"PRId32, offset);
201
	} else {
202
		be_emit_irprintf("0x%"PRIX32, (uint32_t)offset);
203
204
205
	}
}

206
static void emit_ia32_immediate_attr(bool const prefix, ir_node const *const node)
207
{
208
209
	ia32_immediate_attr_t const *const attr = get_ia32_immediate_attr_const(node);
	emit_ia32_immediate(prefix, attr->no_pic_adjust, attr->entity, attr->offset);
210
}
211

Matthias Braun's avatar
Matthias Braun committed
212
static void ia32_emit_mode_suffix_mode(const ir_mode *mode)
213
{
214
215
216
217
218
	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
219
220
		/* gas docu says q is the suffix but gcc, objdump and icc use ll
		 * apparently */
Matthias Braun's avatar
Matthias Braun committed
221
222
		case 64: be_emit_cstring("ll"); return;
	}
223
	panic("cannot output mode_suffix for %+F", mode);
Christian Würdig's avatar
Christian Würdig committed
224
225
}

226
static void ia32_emit_x87_mode_suffix(ir_node const *const node)
227
{
228
	/* we only need to emit the mode on address mode */
229
230
231
	if (get_ia32_op_type(node) == ia32_Normal)
		return;

232
	ir_mode *mode = get_ia32_ls_mode(node);
233
234
235
236
	assert(mode != NULL);

	if (mode_is_float(mode)) {
		switch (get_mode_size_bits(mode)) {
237
238
239
240
241
242
243
			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;
244
245
		}
	} else {
246
		assert(mode_is_int(mode) || mode_is_reference(mode));
247
248
249
250
251
252
253
		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;
		}
254
	}
255
	panic("cannot output mode_suffix for %+F", mode);
256
257
}

258
static char get_xmm_mode_suffix(ir_mode *mode)
259
260
{
	assert(mode_is_float(mode));
261
	switch (get_mode_size_bits(mode)) {
Christoph Mallon's avatar
Christoph Mallon committed
262
263
	case 32: return 's';
	case 64: return 'd';
264
	default: panic("invalid XMM mode");
265
266
267
	}
}

268
static void ia32_emit_xmm_mode_suffix(ir_node const *const node)
269
270
271
{
	ir_mode *mode = get_ia32_ls_mode(node);
	assert(mode != NULL);
272
	be_emit_char(get_xmm_mode_suffix(mode));
273
274
}

Christian Würdig's avatar
Christian Würdig committed
275
/**
276
 * Returns the target block for a control flow node.
Christian Würdig's avatar
Christian Würdig committed
277
 */
278
static ir_node *get_cfop_target_block(const ir_node *irn)
Christoph Mallon's avatar
Christoph Mallon committed
279
{
280
	assert(get_irn_mode(irn) == mode_X);
281
	return (ir_node*)get_irn_link(irn);
282
}
Christian Würdig's avatar
Christian Würdig committed
283

284
285
286
287
288
289
/**
 * 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);
290
	be_gas_emit_block_name(block);
291
292
}

293
void x86_emit_condition_code(x86_condition_code_t cc)
294
295
{
	switch (cc) {
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
	case x86_cc_overflow:      be_emit_cstring("o");  return;
	case x86_cc_not_overflow:  be_emit_cstring("no"); return;
	case x86_cc_float_below:
	case x86_cc_float_unordered_below:
	case x86_cc_below:         be_emit_cstring("b");  return;
	case x86_cc_float_above_equal:
	case x86_cc_float_unordered_above_equal:
	case x86_cc_above_equal:   be_emit_cstring("ae"); return;
	case x86_cc_float_equal:
	case x86_cc_equal:         be_emit_cstring("e");  return;
	case x86_cc_float_not_equal:
	case x86_cc_not_equal:     be_emit_cstring("ne"); return;
	case x86_cc_float_below_equal:
	case x86_cc_float_unordered_below_equal:
	case x86_cc_below_equal:   be_emit_cstring("be"); return;
	case x86_cc_float_above:
	case x86_cc_float_unordered_above:
	case x86_cc_above:         be_emit_cstring("a");  return;
	case x86_cc_sign:          be_emit_cstring("s");  return;
	case x86_cc_not_sign:      be_emit_cstring("ns"); return;
	case x86_cc_parity:        be_emit_cstring("p");  return;
	case x86_cc_not_parity:    be_emit_cstring("np"); return;
	case x86_cc_less:          be_emit_cstring("l");  return;
	case x86_cc_greater_equal: be_emit_cstring("ge"); return;
	case x86_cc_less_equal:    be_emit_cstring("le"); return;
	case x86_cc_greater:       be_emit_cstring("g");  return;
	case x86_cc_float_parity_cases:
	case x86_cc_additional_float_cases:
324
		break;
325
	}
326
	panic("invalid ia32 condition code");
327
328
}

329
typedef enum ia32_emit_mod_t {
330
	EMIT_NONE         = 0,
331
	EMIT_RESPECT_LS   = 1U << 0,
332
	EMIT_ALTERNATE_AM = 1U << 1,
333
334
	EMIT_LONG         = 1U << 2,
	EMIT_HIGH_REG     = 1U << 3,
335
	EMIT_LOW_REG      = 1U << 4,
336
337
	EMIT_16BIT_REG    = 1U << 5,
	EMIT_SHIFT_COMMA  = 1U << 6,
338
} ia32_emit_mod_t;
339
ENUM_BITSET(ia32_emit_mod_t)
340

341
342
343
344
345
346
static ir_node const *get_irn_n_reg(ir_node const *const node, int const pos)
{
	ir_node *const in = get_irn_n(node, pos);
	return is_ia32_NoReg_GP(in) ? NULL : in;
}

347
348
349
/**
 * Emits address mode.
 */
350
static void ia32_emit_am(ir_node const *const node)
351
352
{
	/* just to be sure... */
353
	assert(get_ia32_frame_use(node) == IA32_FRAME_USE_NONE || get_ia32_frame_ent(node));
354

355
356
357
	if (get_ia32_am_tls_segment(node))
		be_emit_cstring("%gs:");

358
359
360
	ir_node const *const base = get_irn_n_reg(node, n_ia32_base);
	ir_node const *const idx  = get_irn_n_reg(node, n_ia32_index);

361
	/* emit offset */
362
363
364
	int32_t    const offs = get_ia32_am_offs_int(node);
	ir_entity *const ent  = get_ia32_am_ent(node);
	if (ent) {
365
		const ia32_attr_t *attr = get_ia32_attr_const(node);
366
		ia32_emit_entity(ent, attr->am_sc_no_pic_adjust);
367
		if (offs != 0)
368
			be_emit_irprintf("%+"PRId32, offs);
369
370
371
	} else if (offs != 0 || (!base && !idx)) {
		/* also handle special case if nothing is set */
		be_emit_irprintf("%"PRId32, offs);
372
373
	}

374
	if (base || idx) {
375
376
377
		be_emit_char('(');

		/* emit base */
378
		if (base) {
379
			arch_register_t const *const reg = arch_get_irn_register(base);
380
381
382
383
			emit_register(reg, NULL);
		}

		/* emit index + scale */
384
		if (idx) {
385
			be_emit_char(',');
386
			arch_register_t const *const reg = arch_get_irn_register(idx);
387
388
			emit_register(reg, NULL);

389
			int const scale = get_ia32_am_scale(node);
390
			if (scale > 0)
391
392
393
394
395
396
				be_emit_irprintf(",%d", 1 << scale);
		}
		be_emit_char(')');
	}
}

397
static x86_condition_code_t determine_final_cc(ir_node const *node, int flags_pos);
398
399

void ia32_emitf(ir_node const *const node, char const *fmt, ...)
400
401
402
403
{
	va_list ap;
	va_start(ap, fmt);

404
	be_emit_char('\t');
405
	for (;;) {
406
		const char      *start = fmt;
407
		ia32_emit_mod_t  mod   = EMIT_NONE;
408
409
410
411
412
413
414
415

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

		if (*fmt == '\n') {
416
417
418
			be_emit_char('\n');
			be_emit_write_line();
			be_emit_char('\t');
419
420
421
422
423
424
425
			++fmt;
			if (*fmt == '\0')
				break;
			continue;
		}

		if (*fmt == '\0')
Christian Würdig's avatar
Christian Würdig committed
426
			break;
427
428

		++fmt;
429
430
		for (;;) {
			switch (*fmt) {
431
432
433
			case '*': mod |= EMIT_ALTERNATE_AM; break;
			case '#': mod |= EMIT_RESPECT_LS;   break;
			case 'l': mod |= EMIT_LONG;         break;
434
435
			case '>': mod |= EMIT_HIGH_REG;     break;
			case '<': mod |= EMIT_LOW_REG;      break;
436
			case '^': mod |= EMIT_16BIT_REG;    break;
437
			case ',': mod |= EMIT_SHIFT_COMMA;  break;
438
439
440
			default:
				goto end_of_mods;
			}
441
442
			++fmt;
		}
443
end_of_mods:
444

445
		switch (*fmt++) {
446
447
448
			arch_register_t const *reg;
			ir_node         const *imm;

449
450
451
452
453
454
			case '%':
				be_emit_char('%');
				break;

			case 'A': {
				switch (*fmt++) {
455
					case 'F':
456
						if (get_ia32_op_type(node) == ia32_Normal) {
457
458
459
							ia32_x87_attr_t const *const attr = get_ia32_x87_attr_const(node);
							char            const *const fmt  = attr->res_in_reg ? "%%st, %%%s" : "%%%s, %%st";
							be_emit_irprintf(fmt, attr->reg->name);
460
							break;
461
462
						} else {
							goto emit_AM;
463
464
						}

465
emit_AM:
466
					case 'M':
467
468
						if (mod & EMIT_ALTERNATE_AM)
							be_emit_char('*');
469
470
471
						ia32_emit_am(node);
						break;

472
473
					case 'R':
						reg = va_arg(ap, const arch_register_t*);
474
						if (get_ia32_op_type(node) == ia32_Normal) {
475
							goto emit_R;
476
477
						} else {
							goto emit_AM;
478
479
480
						}

					case 'S':
481
482
483
						if (get_ia32_op_type(node) == ia32_Normal) {
							goto emit_S;
						} else {
484
							++fmt;
485
							goto emit_AM;
486
487
488
489
490
491
492
						}

					default: goto unknown;
				}
				break;
			}

493
494
495
			case 'B': {
				ir_node const *const src = get_irn_n(node, n_ia32_binary_right);
				if (is_ia32_Immediate(src)) {
496
					emit_ia32_immediate_attr(true, src);
497
					be_emit_cstring(", ");
498
499
					if (get_ia32_op_type(node) == ia32_Normal) {
						goto destination_operand;
500
					} else {
501
						ia32_emit_am(node);
502
503
					}
				} else {
504
					if (get_ia32_op_type(node) == ia32_Normal) {
505
						reg = arch_get_irn_register(src);
506
						emit_register(reg, get_ia32_ls_mode(node));
507
508
					} else {
						ia32_emit_am(node);
509
510
					}
					be_emit_cstring(", ");
511
destination_operand:
512
513
514
515
					reg = arch_get_irn_register_in(node, n_ia32_binary_left);
					emit_register(reg, get_ia32_ls_mode(node));
				}
				break;
516
			}
517

518
			case 'D':
519
				if (!is_digit(*fmt))
520
					goto unknown;
521
				reg = arch_get_irn_register_out(node, *fmt++ - '0');
522
				goto emit_R;
523

524
525
526
			case 'F':
				if (*fmt == 'M') {
					ia32_emit_x87_mode_suffix(node);
527
528
529
530
				} else if (*fmt == 'P') {
					ia32_x87_attr_t const *const attr = get_ia32_x87_attr_const(node);
					if (attr->pop)
						be_emit_char('p');
531
532
533
534
535
536
537
538
539
540
541
542
				} else if (*fmt == 'R') {
					/* NOTE: Work around a gas quirk for non-commutative operations if the
					 * destination register is not %st0.  In this case r/non-r is swapped.
					 * %st0 = %st0 - %st1 -> fsub  %st1, %st0 (as expected)
					 * %st0 = %st1 - %st0 -> fsubr %st1, %st0 (as expected)
					 * %st1 = %st0 - %st1 -> fsub  %st0, %st1 (expected: fsubr)
					 * %st1 = %st1 - %st0 -> fsubr %st0, %st1 (expected: fsub)
					 * In fact this corresponds to the encoding of the instruction:
					 * - The r suffix selects whether %st0 is on the left (no r) or on the
					 *   right (r) side of the executed operation.
					 * - The placement of %st0 selects whether the result is written to
					 *   %st0 (right) or the other register (left).
543
544
545
					 * This means that it is sufficient to test whether the operands are
					 * permuted.  In particular it is not necessary to consider wether the
					 * result is to be placed into the explicit register operand. */
546
					if (get_ia32_x87_attr_const(node)->attr.ins_permuted)
547
						be_emit_char('r');
548
549
				} else if (*fmt == 'X') {
					ia32_emit_xmm_mode_suffix(node);
550
				} else if (*fmt == '0') {
551
					be_emit_char('%');
552
					be_emit_string(get_ia32_x87_attr_const(node)->reg->name);
553
554
555
				} else {
					goto unknown;
				}
556
				++fmt;
557
558
				break;

559
			case 'I':
560
561
				imm = node;
emit_I:
562
563
564
				if (mod & EMIT_SHIFT_COMMA) {
					const ia32_immediate_attr_t *attr
						= get_ia32_immediate_attr_const(imm);
565
					if (attr->entity == NULL && attr->offset == 1)
566
567
						break;
				}
568
				emit_ia32_immediate_attr(!(mod & EMIT_ALTERNATE_AM), imm);
569
570
571
				if (mod & EMIT_SHIFT_COMMA) {
					be_emit_char(',');
				}
572
573
574
575
576
577
				break;

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

578
579
580
			case 'M': {
				ir_mode *mode = get_ia32_ls_mode(node);
				if (!mode)
581
					mode = ia32_mode_gp;
582
583
584
585
586
587
				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);
588
				break;
589
			}
590
591

			case 'P': {
592
				x86_condition_code_t cc;
593
594
				if (*fmt == 'X') {
					++fmt;
595
					cc = (x86_condition_code_t)va_arg(ap, int);
596
				} else if (is_digit(*fmt)) {
597
					cc = determine_final_cc(node, *fmt - '0');
yb9976's avatar
yb9976 committed
598
					++fmt;
599
600
601
				} else {
					goto unknown;
				}
602
				x86_emit_condition_code(cc);
603
604
605
				break;
			}

606
607
608
609
610
			case 'R':
				reg = va_arg(ap, const arch_register_t*);
emit_R:
				if (mod & EMIT_ALTERNATE_AM)
					be_emit_char('*');
611
				const char *name;
612
				if (mod & EMIT_HIGH_REG) {
613
					name = get_register_name_8bit_high(reg);
614
				} else if (mod & EMIT_LOW_REG) {
615
					name = get_register_name_8bit_low(reg);
616
				} else if (mod & EMIT_16BIT_REG) {
617
					name = get_register_name_16bit(reg);
618
				} else {
619
620
621
					name = mod & EMIT_RESPECT_LS
						 ? get_register_name_mode(reg, get_ia32_ls_mode(node))
						 : reg->name;
622
				}
623
624
				be_emit_char('%');
				be_emit_string(name);
625
626
627
				if (mod & EMIT_SHIFT_COMMA) {
					be_emit_char(',');
				}
628
629
630
631
				break;

emit_S:
			case 'S': {
632
				if (!is_digit(*fmt))
633
634
					goto unknown;

635
				unsigned pos = *fmt++ - '0';
636
637
638
				ir_node const *const src = get_irn_n(node, pos);
				if (is_ia32_Immediate(src)) {
					imm = src;
639
					goto emit_I;
640
				} else {
641
					reg = arch_get_irn_register(src);
642
					goto emit_R;
643
644
645
646
647
648
649
650
651
				}
			}

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

652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
			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);
				}
670
671
672
673
				break;

			default:
unknown:
674
				panic("unknown format conversion");
675
		}
676
677
	}

678
	be_emit_finish_line_gas(node);
679
680
681
	va_end(ap);
}

682
683
684
/**
 * walks up a tree of copies/perms/spills/reloads to find the original value
 * that is moved around
685
 */
686
687
static ir_node *find_original_value(ir_node *node)
{
688
689
690
691
692
693
694
695
696
697
698
	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)) {
699
			return find_original_value(get_irn_n(pred, get_Proj_num(node)));
700
		} else if (be_is_MemPerm(pred)) {
701
			return find_original_value(get_irn_n(pred, get_Proj_num(node)));
702
703
		} 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
704
705
		} else if (is_ia32_Store(pred)) {
			return find_original_value(get_irn_n(pred, n_ia32_Store_val));
706
707
708
		} else {
			return node;
		}
709
	} else if (is_Phi(node)) {
710
		foreach_irn_in(node, i, in) {
711
712
713
714
715
716
717
			ir_node *res = find_original_value(in);
			if (res != NULL)
				return res;
		}
		return NULL;
	} else {
		return node;
718
719
720
	}
}

721
static x86_condition_code_t determine_final_cc(ir_node const *const node, int const flags_pos)
722
{
723
724
725
726
727
	ia32_condcode_attr_t const *const attr = get_ia32_condcode_attr_const(node);
	x86_condition_code_t              cc   = attr->condition_code;
	if (attr->attr.ins_permuted)
		cc = x86_negate_condition_code(cc);

728
	ir_node *flags = skip_Proj(get_irn_n(node, flags_pos));
729

730
	/* Permuted operands of a test instruction do not change the result. */
731
	if (is_ia32_Test(flags))
732
733
		return cc;

Christoph Mallon's avatar
Christoph Mallon committed
734
	if (is_ia32_Sahf(flags)) {
735
736
737
		flags = get_irn_n(flags, n_ia32_Sahf_val);
		if (!is_ia32_FucomFnstsw(flags) && !is_ia32_FucomppFnstsw(flags) && !is_ia32_FtstFnstsw(flags)) {
			ir_graph *const irg = get_irn_irg(node);
738
			inc_irg_visited(irg);
739
740
			flags = find_original_value(flags);
			assert(is_ia32_FucomFnstsw(flags) || is_ia32_FucomppFnstsw(flags) || is_ia32_FtstFnstsw(flags));
741
		}
742
	}
743

744
	ia32_attr_t const *const flags_attr = get_ia32_attr_const(flags);
745
	if (flags_attr->ins_permuted)
746
		cc = x86_invert_condition_code(cc);
747
	return cc;
748
749
}

750
751
752
753
754
755
/**
 * 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());
756
	be_emit_irprintf("%lu", get_ia32_exc_label_id(node));
757
758
}

759
static bool fallthrough_possible(const ir_node *block, const ir_node *target)
760
{
761
	return get_prev_block_sched(target) == block;
762
763
}

Christian Würdig's avatar
Christian Würdig committed
764
765
766
/**
 * Emits the jump sequence for a conditional jump (cmp + jmp_true + jmp_false)
 */
767
static void emit_ia32_Jcc(const ir_node *node)
768
{
769
	x86_condition_code_t cc = determine_final_cc(node, n_ia32_Jcc_eflags);
Christian Würdig's avatar
Christian Würdig committed
770

771
	/* get both Projs */
772
	ir_node const *proj_true   = get_Proj_for_pn(node, pn_ia32_Jcc_true);
773
	ir_node const *target_true = get_cfop_target_block(proj_true);
774
	ir_node const *proj_false  = get_Proj_for_pn(node, pn_ia32_Jcc_false);
775
776
	ir_node const *block       = get_nodes_block(node);
	if (fallthrough_possible(block, target_true)) {
777
		/* exchange both proj's so the second one can be omitted */
778
779
		const ir_node *t = proj_true;

780
781
		proj_true  = proj_false;
		proj_false = t;
782
		cc         = x86_negate_condition_code(cc);
783
	}
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
	const ir_node *target_false = get_cfop_target_block(proj_false);
	bool           fallthrough  = fallthrough_possible(block, target_false);
	/* if we can't have a fallthrough anyway, put the more likely case first */
	if (!fallthrough) {
		/* We would need execfreq for the concrete edge, but don't have it
		 * available here, so we use the block execfreq :-( */
		double freq_true  = get_block_execfreq(target_true);
		double freq_false = get_block_execfreq(target_false);
		if (freq_false > freq_true) {
			const ir_node *t = proj_true;
			proj_true  = proj_false;
			proj_false = t;
			cc         = x86_negate_condition_code(cc);
		}
	}
799

800
	bool need_parity_label = false;
801
	if (cc & x86_cc_float_parity_cases) {
802
803
		/* Some floating point comparisons require a test of the parity flag,
		 * which indicates that the result is unordered */
804
		if (cc & x86_cc_negated) {
805
			ia32_emitf(proj_true, "jp %L");
806
		} else {
807
808
			/* we need a local label if the false proj is a fallthrough
			 * as the falseblock might have no label emitted then */
809
810
			if (fallthrough) {
				need_parity_label = true;
811
				ia32_emitf(proj_false, "jp 1f");
812
			} else {
813
				ia32_emitf(proj_false, "jp %L");
814
			}
815
		}
816
	}
817
	ia32_emitf(proj_true, "j%PX %L", (int)cc);
Christoph Mallon's avatar
Christoph Mallon committed
818
	if (need_parity_label) {
819
820
		be_emit_cstring("1:\n");
		be_emit_write_line();
821
822
	}

823
	/* the second Proj might be a fallthrough */
824
	if (fallthrough) {
825
		if (be_options.verbose_asm)
826
			ia32_emitf(proj_false, "/* fallthrough to %L */");
827
	} else {
828
		ia32_emitf(proj_false, "jmp %L");
829
	}
Michael Beck's avatar
Michael Beck committed
830
831
}

832
833
834
835
836
837
/**
 * Emits an ia32 Setcc. This is mostly easy but some floating point compares
 * are tricky.
 */
static void emit_ia32_Setcc(const ir_node *node)
{
838
	const arch_register_t *dreg = arch_get_irn_register_out(node, pn_ia32_Setcc_res);
839

840
	x86_condition_code_t const cc = determine_final_cc(node, n_ia32_Setcc_eflags);
841
842
	if (cc & x86_cc_float_parity_cases) {
		if (cc & x86_cc_negated) {
843
844
845
			ia32_emitf(node, "set%PX %<R", (int)cc, dreg);
			ia32_emitf(node, "setp %>R", dreg);
			ia32_emitf(node, "orb %>R, %<R", dreg, dreg);
846
		} else {
847
848
849
			ia32_emitf(node, "set%PX %<R", (int)cc, dreg);
			ia32_emitf(node, "setnp %>R", dreg);
			ia32_emitf(node, "andb %>R, %<R", dreg, dreg);
850
		}
851
	} else {
852
		ia32_emitf(node, "set%PX %#R", (int)cc, dreg);
853
854
855
	}
}

856
/**
857
 * Emits code for a SwitchJmp
858
859
860
 */
static void emit_ia32_SwitchJmp(const ir_node *node)
{
861
	ir_entity             *jump_table = get_ia32_am_ent(node);
Matthias Braun's avatar
Matthias Braun committed
862
	const ir_switch_table *table      = get_ia32_switch_table(node);
Christian Würdig's avatar
Christian Würdig committed
863

864
	ia32_emitf(node, "jmp %*AM");
Matthias Braun's avatar
Matthias Braun committed
865
	be_emit_jump_table(node, table, jump_table, get_cfop_target_block);
Christian Würdig's avatar
Christian Würdig committed
866
867
868
869
870
}

/**
 * Emits code for a unconditional jump.
 */
871
static void emit_ia32_Jmp(const ir_node *node)
872
{
873
	/* we have a block schedule */
874
875
876
	ir_node *block  = get_nodes_block(node);
	ir_node *target = get_cfop_target_block(node);
	if (fallthrough_possible(block, target)) {
877
		if (be_options.verbose_asm)
878
			ia32_emitf(node, "/* fallthrough to %L */");
879
	} else {
880
		ia32_emitf(node, "jmp %L");
Christian Würdig's avatar
Christian Würdig committed
881
882
883
	}
}

884
885
886
887
888
889
890
891
892
static void emit_ia32_asm_register(const arch_register_t *reg, char modifier,
                                   ir_mode *mode)
{
	const char *name;
	switch (modifier) {
	case '\0': name = get_register_name_mode(reg, mode); break;
	case  'b': name = get_register_name_8bit_low(reg); break;
	case  'h': name = get_register_name_8bit_high(reg); break;
	case  'w': name = get_register_name_16bit(reg); break;
893
	case  'k': name = reg->name; break;
894
	default:
895
		panic("invalid asm op modifier");
896
	}
897
898
	be_emit_char('%');
	be_emit_string(name);
899
900
}

901
902
903
904
905
906
907
908