ia32_emitter.c 51.3 KB
Newer Older
Christian Würdig's avatar
Christian Würdig committed
1
/*
Michael Beck's avatar
Michael Beck committed
2
 * Copyright (C) 1995-2008 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
24
 * @brief       This file implements the ia32 node emitter.
 * @author      Christian Wuerdig, Matthias Braun
 * @version     $Id$
25
 */
Christian Würdig's avatar
Christian Würdig committed
26
#ifdef HAVE_CONFIG_H
27
#include "config.h"
Christian Würdig's avatar
Christian Würdig committed
28
29
#endif

Christian Würdig's avatar
Christian Würdig committed
30
31
#include <limits.h>

32
#include "xmalloc.h"
33
34
#include "tv.h"
#include "iredges.h"
Christian Würdig's avatar
Christian Würdig committed
35
36
37
38
#include "debug.h"
#include "irgwalk.h"
#include "irprintf.h"
#include "irop_t.h"
Christian Würdig's avatar
Christian Würdig committed
39
#include "irargs_t.h"
40
#include "irprog_t.h"
41
#include "iredges_t.h"
42
#include "execfreq.h"
43
#include "error.h"
Matthias Braun's avatar
Matthias Braun committed
44
#include "raw_bitset.h"
45
#include "dbginfo.h"
Christian Würdig's avatar
Christian Würdig committed
46

47
#include "../besched_t.h"
Christian Würdig's avatar
Christian Würdig committed
48
#include "../benode_t.h"
Michael Beck's avatar
Michael Beck committed
49
#include "../beabi.h"
50
#include "../be_dbgout.h"
Matthias Braun's avatar
Matthias Braun committed
51
52
#include "../beemitter.h"
#include "../begnuas.h"
53
#include "../beirg_t.h"
54
#include "../be_dbgout.h"
Christian Würdig's avatar
Christian Würdig committed
55

56
#include "ia32_emitter.h"
Christian Würdig's avatar
Christian Würdig committed
57
#include "gen_ia32_emitter.h"
Christian Würdig's avatar
Christian Würdig committed
58
#include "gen_ia32_regalloc_if.h"
59
60
#include "ia32_nodes_attr.h"
#include "ia32_new_nodes.h"
Christian Würdig's avatar
Christian Würdig committed
61
#include "ia32_map_regs.h"
62
#include "ia32_architecture.h"
Christian Würdig's avatar
Christian Würdig committed
63
#include "bearch_ia32_t.h"
Christian Würdig's avatar
Christian Würdig committed
64

65
66
DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)

67
#define BLOCK_PREFIX ".L"
Michael Beck's avatar
Michael Beck committed
68

Christian Würdig's avatar
Christian Würdig committed
69
70
#define SNPRINTF_BUF_LEN 128

71
72
73
74
static const arch_env_t *arch_env;
static const ia32_isa_t *isa;
static ia32_code_gen_t  *cg;

Christian Würdig's avatar
Christian Würdig committed
75
/**
Christian Würdig's avatar
Christian Würdig committed
76
 * Returns the register at in position pos.
Christian Würdig's avatar
Christian Würdig committed
77
 */
78
static const arch_register_t *get_in_reg(const ir_node *irn, int pos)
79
{
80
81
	ir_node               *op;
	const arch_register_t *reg = NULL;
Christian Würdig's avatar
Christian Würdig committed
82
83
84
85
86
87
88

	assert(get_irn_arity(irn) > pos && "Invalid IN position");

	/* The out register of the operator at position pos is the
	   in register we need. */
	op = get_irn_n(irn, pos);

Christian Würdig's avatar
Christian Würdig committed
89
	reg = arch_get_irn_register(arch_env, op);
Christian Würdig's avatar
Christian Würdig committed
90

Christian Würdig's avatar
Christian Würdig committed
91
	assert(reg && "no in register found");
92

93
	if(reg == &ia32_gp_regs[REG_GP_NOREG])
94
		panic("trying to emit noreg for %+F input %d", irn, pos);
95
96
97

	/* in case of unknown register: just return a valid register */
	if (reg == &ia32_gp_regs[REG_GP_UKNWN]) {
Matthias Braun's avatar
Matthias Braun committed
98
		const arch_register_req_t *req;
99
100

		/* ask for the requirements */
Matthias Braun's avatar
Matthias Braun committed
101
		req = arch_get_register_req(arch_env, irn, pos);
102

Matthias Braun's avatar
Matthias Braun committed
103
		if (arch_register_req_is(req, limited)) {
104
			/* in case of limited requirements: get the first allowed register */
Matthias Braun's avatar
Matthias Braun committed
105
106
			unsigned idx = rbitset_next(req->limited, 0, 1);
			reg = arch_register_for_index(req->cls, idx);
107
		} else {
108
			/* otherwise get first register in class */
Matthias Braun's avatar
Matthias Braun committed
109
			reg = arch_register_for_index(req->cls, 0);
110
111
		}
	}
112

Christian Würdig's avatar
Christian Würdig committed
113
114
115
116
117
118
	return reg;
}

/**
 * Returns the register at out position pos.
 */
119
static const arch_register_t *get_out_reg(const ir_node *irn, int pos)
120
121
122
{
	ir_node               *proj;
	const arch_register_t *reg = NULL;
Christian Würdig's avatar
Christian Würdig committed
123
124
125
126
127
128
129

	/* 1st case: irn is not of mode_T, so it has only                 */
	/*           one OUT register -> good                             */
	/* 2nd case: irn is of mode_T -> collect all Projs and ask the    */
	/*           Proj with the corresponding projnum for the register */

	if (get_irn_mode(irn) != mode_T) {
130
		assert(pos == 0);
Christian Würdig's avatar
Christian Würdig committed
131
		reg = arch_get_irn_register(arch_env, irn);
132
	} else if (is_ia32_irn(irn)) {
Christian Würdig's avatar
Christian Würdig committed
133
		reg = get_ia32_out_reg(irn, pos);
134
	} else {
Christian Würdig's avatar
Christian Würdig committed
135
136
137
138
139
140
141
142
143
144
145
146
147
		const ir_edge_t *edge;

		foreach_out_edge(irn, edge) {
			proj = get_edge_src_irn(edge);
			assert(is_Proj(proj) && "non-Proj from mode_T node");
			if (get_Proj_proj(proj) == pos) {
				reg = arch_get_irn_register(arch_env, proj);
				break;
			}
		}
	}

	assert(reg && "no out register found");
Christian Würdig's avatar
Christian Würdig committed
148
149
150
	return reg;
}

Michael Beck's avatar
Michael Beck committed
151
/**
152
 * Add a number to a prefix. This number will not be used a second time.
Michael Beck's avatar
Michael Beck committed
153
 */
154
155
static char *get_unique_label(char *buf, size_t buflen, const char *prefix)
{
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
	static unsigned long id = 0;
	snprintf(buf, buflen, "%s%lu", prefix, ++id);
	return buf;
}

/*************************************************************
 *             _       _    __   _          _
 *            (_)     | |  / _| | |        | |
 *  _ __  _ __ _ _ __ | |_| |_  | |__   ___| |_ __   ___ _ __
 * | '_ \| '__| | '_ \| __|  _| | '_ \ / _ \ | '_ \ / _ \ '__|
 * | |_) | |  | | | | | |_| |   | | | |  __/ | |_) |  __/ |
 * | .__/|_|  |_|_| |_|\__|_|   |_| |_|\___|_| .__/ \___|_|
 * | |                                       | |
 * |_|                                       |_|
 *************************************************************/

172
173
static void emit_8bit_register(const arch_register_t *reg)
{
174
	const char *reg_name = arch_register_get_name(reg);
Christian Würdig's avatar
Christian Würdig committed
175

176
177
178
179
180
181
182
183
	be_emit_char('%');
	be_emit_char(reg_name[1]);
	be_emit_char('l');
}

static void emit_16bit_register(const arch_register_t *reg)
{
	const char *reg_name = ia32_get_mapped_reg_name(isa->regs_16bit, reg);
Christian Würdig's avatar
Christian Würdig committed
184

185
186
	be_emit_char('%');
	be_emit_string(reg_name);
187
188
}

189
190
191
192
193
194
195
196
197
198
199
200
201
static void emit_register(const arch_register_t *reg, const ir_mode *mode)
{
	const char *reg_name;

	if(mode != NULL) {
		int size = get_mode_size_bits(mode);
		if(size == 8) {
			emit_8bit_register(reg);
			return;
		} else if(size == 16) {
			emit_16bit_register(reg);
			return;
		} else {
202
			assert(mode_is_float(mode) || size == 32);
203
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
void ia32_emit_source_register(const ir_node *node, int pos)
213
{
214
	const arch_register_t *reg      = get_in_reg(node, pos);
215

216
	emit_register(reg, NULL);
217
218
}

219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
static void emit_ia32_Immediate(const ir_node *node);

void ia32_emit_8bit_source_register_or_immediate(const ir_node *node, int pos)
{
	const arch_register_t *reg;
	ir_node               *in = get_irn_n(node, pos);
	if(is_ia32_Immediate(in)) {
		emit_ia32_Immediate(in);
		return;
	}

	reg = get_in_reg(node, pos);
	emit_8bit_register(reg);
}

void ia32_emit_dest_register(const ir_node *node, int pos)
{
	const arch_register_t *reg  = get_out_reg(node, pos);

	emit_register(reg, NULL);
}

void ia32_emit_8bit_dest_register(const ir_node *node, int pos)
{
	const arch_register_t *reg  = get_out_reg(node, pos);

	emit_register(reg, mode_Bu);
}

void ia32_emit_x87_register(const ir_node *node, int pos)
Christian Würdig's avatar
Christian Würdig committed
249
{
250
	const ia32_x87_attr_t *attr = get_ia32_x87_attr_const(node);
251

Matthias Braun's avatar
Matthias Braun committed
252
	assert(pos < 3);
253
254
	be_emit_char('%');
	be_emit_string(attr->x87[pos]->name);
255
}
Christian Würdig's avatar
Christian Würdig committed
256

Matthias Braun's avatar
Matthias Braun committed
257
static void ia32_emit_mode_suffix_mode(const ir_mode *mode)
258
{
Matthias Braun's avatar
Matthias Braun committed
259
260
261
262
	if(mode_is_float(mode)) {
		switch(get_mode_size_bits(mode)) {
		case 32: be_emit_char('s'); return;
		case 64: be_emit_char('l'); return;
263
264
		case 80:
		case 96: be_emit_char('t'); return;
Matthias Braun's avatar
Matthias Braun committed
265
266
267
268
269
270
271
272
273
274
275
276
277
		}
	} else {
		assert(mode_is_int(mode) || mode_is_reference(mode));
		switch(get_mode_size_bits(mode)) {
		case 64: be_emit_cstring("ll"); return;
				 /* gas docu says q is the suffix but gcc, objdump and icc use
				 	ll apparently */
		case 32: be_emit_char('l'); return;
		case 16: be_emit_char('w'); return;
		case 8:  be_emit_char('b'); return;
		}
	}
	panic("Can't output mode_suffix for %+F\n", mode);
Christian Würdig's avatar
Christian Würdig committed
278
279
}

280
void ia32_emit_mode_suffix(const ir_node *node)
281
282
{
	ir_mode *mode = get_ia32_ls_mode(node);
Matthias Braun's avatar
Matthias Braun committed
283
284
285
	if(mode == NULL)
		mode = mode_Iu;

286
	ia32_emit_mode_suffix_mode(mode);
287
288
}

289
void ia32_emit_x87_mode_suffix(const ir_node *node)
290
291
{
	ir_mode *mode = get_ia32_ls_mode(node);
292
293
294
	assert(mode != NULL);
	/* we only need to emit the mode on address mode */
	if(get_ia32_op_type(node) != ia32_Normal)
295
		ia32_emit_mode_suffix_mode(mode);
296
297
}

298
static char get_xmm_mode_suffix(ir_mode *mode)
299
300
301
302
303
304
305
306
307
308
309
310
311
{
	assert(mode_is_float(mode));
	switch(get_mode_size_bits(mode)) {
	case 32:
		return 's';
	case 64:
		return 'd';
	default:
		assert(0);
	}
	return '%';
}

312
void ia32_emit_xmm_mode_suffix(const ir_node *node)
313
314
{
	ir_mode *mode = get_ia32_ls_mode(node);
315
	assert(mode != NULL);
316
317
	be_emit_char('s');
	be_emit_char(get_xmm_mode_suffix(mode));
318
319
}

320
void ia32_emit_xmm_mode_suffix_s(const ir_node *node)
321
322
323
{
	ir_mode *mode = get_ia32_ls_mode(node);
	assert(mode != NULL);
324
	be_emit_char(get_xmm_mode_suffix(mode));
325
326
}

327
void ia32_emit_extend_suffix(const ir_mode *mode)
328
329
330
331
{
	if(get_mode_size_bits(mode) == 32)
		return;
	if(mode_is_signed(mode)) {
332
		be_emit_char('s');
333
	} else {
334
		be_emit_char('z');
Matthias Braun's avatar
Matthias Braun committed
335
336
337
	}
}

338
void ia32_emit_source_register_or_immediate(const ir_node *node, int pos)
339
340
341
{
	ir_node *in = get_irn_n(node, pos);
	if(is_ia32_Immediate(in)) {
342
		emit_ia32_Immediate(in);
343
	} else {
344
345
346
		const ir_mode         *mode = get_ia32_ls_mode(node);
		const arch_register_t *reg  = get_in_reg(node, pos);
		emit_register(reg, mode);
347
348
349
	}
}

Christian Würdig's avatar
Christian Würdig committed
350
351
352
/**
 * Emits registers and/or address mode of a binary operation.
 */
353
void ia32_emit_binop(const ir_node *node) {
354
355
356
	const ir_node         *right_op  = get_irn_n(node, n_ia32_binary_right);
	const ir_mode         *mode      = get_ia32_ls_mode(node);
	const arch_register_t *reg_left;
Christian Würdig's avatar
Christian Würdig committed
357

358
359
	switch(get_ia32_op_type(node)) {
	case ia32_Normal:
360
		reg_left = get_in_reg(node, n_ia32_binary_left);
361
		if(is_ia32_Immediate(right_op)) {
362
363
364
			emit_ia32_Immediate(right_op);
			be_emit_cstring(", ");
			emit_register(reg_left, mode);
Christian Würdig's avatar
Christian Würdig committed
365
			break;
366
		} else {
367
368
369
370
371
			const arch_register_t *reg_right
				= get_in_reg(node, n_ia32_binary_right);
			emit_register(reg_right, mode);
			be_emit_cstring(", ");
			emit_register(reg_left, mode);
372
373
374
		}
		break;
	case ia32_AddrModeS:
375
		if(is_ia32_Immediate(right_op)) {
376
377
378
			emit_ia32_Immediate(right_op);
			be_emit_cstring(", ");
			ia32_emit_am(node);
379
		} else {
380
381
382
383
			reg_left = get_in_reg(node, n_ia32_binary_left);
			ia32_emit_am(node);
			be_emit_cstring(", ");
			emit_register(reg_left, mode);
384
385
386
		}
		break;
	case ia32_AddrModeD:
387
		panic("DestMode can't be output by %%binop anymore");
388
389
390
		break;
	default:
		assert(0 && "unsupported op type");
Christian Würdig's avatar
Christian Würdig committed
391
	}
392
393
}

394
395
396
/**
 * Emits registers and/or address mode of a binary operation.
 */
397
void ia32_emit_x87_binop(const ir_node *node) {
398
	switch(get_ia32_op_type(node)) {
399
		case ia32_Normal:
400
			{
401
402
403
404
				const ia32_x87_attr_t *x87_attr = get_ia32_x87_attr_const(node);
				const arch_register_t *in1      = x87_attr->x87[0];
				const arch_register_t *in2      = x87_attr->x87[1];
				const arch_register_t *out      = x87_attr->x87[2];
405
406
				const arch_register_t *in;

407
				in  = out ? ((out == in2) ? in1 : in2) : in2;
408
				out = out ? out : in1;
409

410
411
412
413
				be_emit_char('%');
				be_emit_string(arch_register_get_name(in));
				be_emit_cstring(", %");
				be_emit_string(arch_register_get_name(out));
414
415
416
			}
			break;
		case ia32_AddrModeS:
417
			ia32_emit_am(node);
418
			break;
419
		case ia32_AddrModeD:
420
421
422
423
424
		default:
			assert(0 && "unsupported op type");
	}
}

425
void ia32_emit_am_or_dest_register(const ir_node *node,
426
427
                                   int pos) {
	if(get_ia32_op_type(node) == ia32_Normal) {
428
		ia32_emit_dest_register(node, pos);
429
430
	} else {
		assert(get_ia32_op_type(node) == ia32_AddrModeD);
431
		ia32_emit_am(node);
432
433
434
	}
}

Christian Würdig's avatar
Christian Würdig committed
435
436
437
/**
 * Emits registers and/or address mode of a unary operation.
 */
438
void ia32_emit_unop(const ir_node *node, int pos) {
439
440
	const ir_node *op;

441
	switch(get_ia32_op_type(node)) {
442
443
444
	case ia32_Normal:
		op = get_irn_n(node, pos);
		if (is_ia32_Immediate(op)) {
445
			emit_ia32_Immediate(op);
446
		} else {
447
			ia32_emit_source_register(node, pos);
448
449
450
451
		}
		break;
	case ia32_AddrModeS:
	case ia32_AddrModeD:
452
		ia32_emit_am(node);
453
454
455
		break;
	default:
		assert(0 && "unsupported op type");
Christian Würdig's avatar
Christian Würdig committed
456
457
458
	}
}

459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
static void ia32_emit_entity(ir_entity *entity)
{
	ident *id;

	set_entity_backend_marked(entity, 1);
	id = get_entity_ld_ident(entity);
	be_emit_ident(id);

	if(get_entity_owner(entity) == get_tls_type()) {
		if (get_entity_visibility(entity) == visibility_external_allocated) {
			be_emit_cstring("@INDNTPOFF");
		} else {
			be_emit_cstring("@NTPOFF");
		}
	}
}

Christian Würdig's avatar
Christian Würdig committed
476
/**
477
 * Emits address mode.
Christian Würdig's avatar
Christian Würdig committed
478
 */
479
void ia32_emit_am(const ir_node *node) {
480
481
482
483
484
485
	ir_entity *ent       = get_ia32_am_sc(node);
	int        offs      = get_ia32_am_offs_int(node);
	ir_node   *base      = get_irn_n(node, 0);
	int        has_base  = !is_ia32_NoReg_GP(base);
	ir_node   *index     = get_irn_n(node, 1);
	int        has_index = !is_ia32_NoReg_GP(index);
Christian Würdig's avatar
Christian Würdig committed
486

487
	/* just to be sure... */
488
	assert(!is_ia32_use_frame(node) || get_ia32_frame_ent(node) != NULL);
Christian Würdig's avatar
Christian Würdig committed
489

490
	/* emit offset */
491
	if (ent != NULL) {
492
		if (is_ia32_am_sc_sign(node))
493
			be_emit_char('-');
494
		ia32_emit_entity(ent);
Christian Würdig's avatar
Christian Würdig committed
495
496
	}

497
	if(offs != 0) {
498
		if(ent != NULL) {
499
			be_emit_irprintf("%+d", offs);
500
		} else {
501
			be_emit_irprintf("%d", offs);
502
		}
503
	}
Christian Würdig's avatar
Christian Würdig committed
504

505
	if (has_base || has_index) {
506
		be_emit_char('(');
Christian Würdig's avatar
Christian Würdig committed
507

508
		/* emit base */
509
		if (has_base) {
510
511
			const arch_register_t *reg = get_in_reg(node, n_ia32_base);
			emit_register(reg, NULL);
Christian Würdig's avatar
Christian Würdig committed
512
513
		}

514
		/* emit index + scale */
515
		if (has_index) {
516
			const arch_register_t *reg = get_in_reg(node, n_ia32_index);
517
			int scale;
518
519
			be_emit_char(',');
			emit_register(reg, NULL);
520

521
522
			scale = get_ia32_am_scale(node);
			if (scale > 0) {
523
				be_emit_irprintf(",%d", 1 << get_ia32_am_scale(node));
524
525
			}
		}
526
		be_emit_char(')');
Christian Würdig's avatar
Christian Würdig committed
527
	}
528
529
530

	/* special case if nothing is set */
	if(ent == NULL && offs == 0 && !has_base && !has_index) {
531
		be_emit_char('0');
532
	}
533
}
Christian Würdig's avatar
Christian Würdig committed
534

Matthias Braun's avatar
Matthias Braun committed
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
static void emit_ia32_IMul(const ir_node *node)
{
	ir_node               *left    = get_irn_n(node, n_ia32_IMul_left);
	const arch_register_t *out_reg = get_out_reg(node, pn_ia32_IMul_res);

	be_emit_cstring("\timul");
	ia32_emit_mode_suffix(node);
	be_emit_char(' ');

	ia32_emit_binop(node);

	/* do we need the 3-address form? */
	if(is_ia32_NoReg_GP(left) ||
			get_in_reg(node, n_ia32_IMul_left) != out_reg) {
		be_emit_cstring(", ");
		emit_register(out_reg, get_ia32_ls_mode(node));
	}
	be_emit_finish_line_gas(node);
}

Christian Würdig's avatar
Christian Würdig committed
555
556
557
558
559
560
561
562
563
564
/*************************************************
 *                 _ _                         _
 *                (_) |                       | |
 *   ___ _ __ ___  _| |_    ___ ___  _ __   __| |
 *  / _ \ '_ ` _ \| | __|  / __/ _ \| '_ \ / _` |
 * |  __/ | | | | | | |_  | (_| (_) | | | | (_| |
 *  \___|_| |_| |_|_|\__|  \___\___/|_| |_|\__,_|
 *
 *************************************************/

Christian Würdig's avatar
Christian Würdig committed
565
#undef IA32_DO_EMIT
Christian Würdig's avatar
Christian Würdig committed
566
#define IA32_DO_EMIT(irn) ia32_fprintf_format(F, irn, cmd_buf, cmnt_buf)
Christian Würdig's avatar
Christian Würdig committed
567

568
569
570
571
/*
 * coding of conditions
 */
struct cmp2conditon_t {
Christian Würdig's avatar
Christian Würdig committed
572
	const char *name;
573
	int         num;
574
575
576
577
578
};

/*
 * positive conditions for signed compares
 */
579
static const struct cmp2conditon_t cmp2condition_s[] = {
580
581
582
583
584
585
586
	{ NULL,              pn_Cmp_False },  /* always false */
	{ "e",               pn_Cmp_Eq },     /* == */
	{ "l",               pn_Cmp_Lt },     /* < */
	{ "le",              pn_Cmp_Le },     /* <= */
	{ "g",               pn_Cmp_Gt },     /* > */
	{ "ge",              pn_Cmp_Ge },     /* >= */
	{ "ne",              pn_Cmp_Lg },     /* != */
587
	{ NULL,              pn_Cmp_Leg},     /* always true */
588
589
590
591
592
};

/*
 * positive conditions for unsigned compares
 */
593
static const struct cmp2conditon_t cmp2condition_u[] = {
Christian Würdig's avatar
Christian Würdig committed
594
595
596
	{ NULL,              pn_Cmp_False },  /* always false */
	{ "e",               pn_Cmp_Eq },     /* == */
	{ "b",               pn_Cmp_Lt },     /* < */
Christian Würdig's avatar
Christian Würdig committed
597
	{ "be",              pn_Cmp_Le },     /* <= */
Christian Würdig's avatar
Christian Würdig committed
598
599
600
	{ "a",               pn_Cmp_Gt },     /* > */
	{ "ae",              pn_Cmp_Ge },     /* >= */
	{ "ne",              pn_Cmp_Lg },     /* != */
601
	{ NULL,              pn_Cmp_Leg },   /* always true  */
602
603
};

604
605
606
607
608
609
610
611
enum {
	ia32_pn_Cmp_unsigned = 0x1000,
	ia32_pn_Cmp_float    = 0x2000,
};

/**
 * walks up a tree of copies/perms/spills/reloads to find the original value
 * that is moved around
612
 */
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
static ir_node *find_original_value(ir_node *node)
{
	inc_irg_visited(current_ir_graph);
	while(1) {
		mark_irn_visited(node);
		if(be_is_Copy(node)) {
			node = be_get_Copy_op(node);
		} else if(be_is_CopyKeep(node)) {
			node = be_get_CopyKeep_op(node);
		} else if(is_Proj(node)) {
			ir_node *pred = get_Proj_pred(node);
			if(be_is_Perm(pred)) {
				node = get_irn_n(pred, get_Proj_proj(node));
			} else if(be_is_MemPerm(pred)) {
				node = get_irn_n(pred, get_Proj_proj(node) + 1);
			} else if(is_ia32_Load(pred)) {
				node = get_irn_n(pred, n_ia32_Load_mem);
			} else {
				return node;
			}
633
		} else if(is_ia32_Store(node)) {
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
			node = get_irn_n(node, n_ia32_Store_val);
		} 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);
				if(irn_visited(in))
					continue;
				node = in;
				break;
			}
			assert(i < arity);
		} else {
			return node;
		}
	}
}

static int determine_final_pnc(const ir_node *node, int flags_pos,
                               int pnc)
654
{
655
656
657
658
659
660
	ir_node           *flags = get_irn_n(node, flags_pos);
	const ia32_attr_t *flags_attr;
	flags = skip_Proj(flags);

	if(is_ia32_Sahf(flags)) {
		ir_node *cmp = get_irn_n(flags, n_ia32_Sahf_val);
661
662
		if(!(is_ia32_FucomFnstsw(cmp) || is_ia32_FucompFnstsw(cmp)
				|| is_ia32_FucomppFnstsw(cmp) || is_ia32_FtstFnstsw(cmp))) {
663
664
			cmp = find_original_value(cmp);
			assert(is_ia32_FucomFnstsw(cmp) || is_ia32_FucompFnstsw(cmp)
665
			       || is_ia32_FucomppFnstsw(cmp) || is_ia32_FtstFnstsw(cmp));
666
		}
667

668
		flags_attr = get_ia32_attr_const(cmp);
669
		if(flags_attr->data.ins_permuted)
670
671
			pnc = get_mirrored_pnc(pnc);
		pnc |= ia32_pn_Cmp_float;
Matthias Braun's avatar
Matthias Braun committed
672
673
	} else if(is_ia32_Ucomi(flags) || is_ia32_Fucomi(flags)
			|| is_ia32_Fucompi(flags)) {
674
675
		flags_attr = get_ia32_attr_const(flags);

676
		if(flags_attr->data.ins_permuted)
677
678
			pnc = get_mirrored_pnc(pnc);
		pnc |= ia32_pn_Cmp_float;
679
	} else {
680
#if 0
681
682
		assert(is_ia32_Cmp(flags) || is_ia32_Test(flags)
				|| is_ia32_Cmp8Bit(flags) || is_ia32_Test8Bit(flags));
683
#endif
684
685
		flags_attr = get_ia32_attr_const(flags);

686
		if(flags_attr->data.ins_permuted)
687
688
689
			pnc = get_mirrored_pnc(pnc);
		if(flags_attr->data.cmp_unsigned)
			pnc |= ia32_pn_Cmp_unsigned;
690
	}
691
692

	return pnc;
693
694
}

695
static void ia32_emit_cmp_suffix(int pnc)
696
{
697
698
699
700
701
702
703
704
705
706
707
708
	const char        *str;

	if((pnc & ia32_pn_Cmp_float) || (pnc & ia32_pn_Cmp_unsigned)) {
		pnc = pnc & 7;
		assert(cmp2condition_u[pnc].num == pnc);
		str = cmp2condition_u[pnc].name;
	} else {
		pnc = pnc & 7;
		assert(cmp2condition_s[pnc].num == pnc);
		str = cmp2condition_s[pnc].name;
	}

709
	be_emit_string(str);
710
711
}

712
void ia32_emit_cmp_suffix_node(const ir_node *node,
713
714
                               int flags_pos)
{
715
716
	const ia32_attr_t *attr = get_ia32_attr_const(node);

Michael Beck's avatar
Michael Beck committed
717
	pn_Cmp pnc = get_ia32_condcode(node);
718
719

	pnc = determine_final_pnc(node, flags_pos, pnc);
720
721
722
723
724
725
726
727
	if(attr->data.ins_permuted) {
		if(pnc & ia32_pn_Cmp_float) {
			pnc = get_negated_pnc(pnc, mode_F);
		} else {
			pnc = get_negated_pnc(pnc, mode_Iu);
		}
	}

728
	ia32_emit_cmp_suffix(pnc);
729
}
730

731
732
733
/**
 * Returns the target block for a control flow node.
 */
734
static ir_node *get_cfop_target_block(const ir_node *irn) {
735
736
737
	return get_irn_link(irn);
}

738
739
740
/**
 * Emits a block label for the given block.
 */
741
static void ia32_emit_block_name(const ir_node *block)
742
{
Michael Beck's avatar
Michael Beck committed
743
	if (has_Block_label(block)) {
744
745
		be_emit_string(be_gas_label_prefix());
		be_emit_irprintf("%u", (unsigned)get_Block_label(block));
Michael Beck's avatar
Michael Beck committed
746
	} else {
747
748
		be_emit_cstring(BLOCK_PREFIX);
		be_emit_irprintf("%d", get_irn_node_nr(block));
Michael Beck's avatar
Michael Beck committed
749
	}
750
751
}

Christian Würdig's avatar
Christian Würdig committed
752
/**
753
 * Emits the target label for a control flow node.
Christian Würdig's avatar
Christian Würdig committed
754
 */
755
756
static void ia32_emit_cfop_target(const ir_node *node)
{
757
	ir_node *block = get_cfop_target_block(node);
758

759
	ia32_emit_block_name(block);
Christian Würdig's avatar
Christian Würdig committed
760
}
761

762
/** Return the next block in Block schedule */
763
764
static ir_node *next_blk_sched(const ir_node *block)
{
Michael Beck's avatar
Michael Beck committed
765
	return get_irn_link(block);
766
767
}

768
769
770
/**
 * Returns the Proj with projection number proj and NOT mode_M
 */
771
static ir_node *get_proj(const ir_node *node, long proj) {
772
773
774
	const ir_edge_t *edge;
	ir_node         *src;

775
	assert(get_irn_mode(node) == mode_T && "expected mode_T node");
776

777
	foreach_out_edge(node, edge) {
778
779
780
781
782
783
784
785
786
787
788
789
		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;
}

Christian Würdig's avatar
Christian Würdig committed
790
791
792
/**
 * Emits the jump sequence for a conditional jump (cmp + jmp_true + jmp_false)
 */
793
static void emit_ia32_Jcc(const ir_node *node)
794
{
795
	int            need_parity_label = 0;
796
797
798
799
	const ir_node *proj_true;
	const ir_node *proj_false;
	const ir_node *block;
	const ir_node *next_block;
Michael Beck's avatar
Michael Beck committed
800
	pn_Cmp         pnc = get_ia32_condcode(node);
Christian Würdig's avatar
Christian Würdig committed
801

802
	pnc = determine_final_pnc(node, 0, pnc);
Christian Würdig's avatar
Christian Würdig committed
803

804
805
806
	/* get both Projs */
	proj_true = get_proj(node, pn_ia32_Jcc_true);
	assert(proj_true && "Jcc without true Proj");
807

808
809
	proj_false = get_proj(node, pn_ia32_Jcc_false);
	assert(proj_false && "Jcc without false Proj");
810

811
	block      = get_nodes_block(node);
812
	next_block = next_blk_sched(block);
813

814
	if (get_cfop_target_block(proj_true) == next_block) {
815
		/* exchange both proj's so the second one can be omitted */
816
817
		const ir_node *t = proj_true;

818
819
		proj_true  = proj_false;
		proj_false = t;
820
821
822
823
824
		if(pnc & ia32_pn_Cmp_float) {
			pnc = get_negated_pnc(pnc, mode_F);
		} else {
			pnc = get_negated_pnc(pnc, mode_Iu);
		}
825
826
	}

827
828
829
830
	if (pnc & ia32_pn_Cmp_float) {
		/* Some floating point comparisons require a test of the parity flag,
		 * which indicates that the result is unordered */
		switch (pnc & 15) {
831
			case pn_Cmp_Uo: {
832
833
834
				be_emit_cstring("\tjp ");
				ia32_emit_cfop_target(proj_true);
				be_emit_finish_line_gas(proj_true);
835
				break;
836
			}
837
838

			case pn_Cmp_Leg:
839
840
841
				be_emit_cstring("\tjnp ");
				ia32_emit_cfop_target(proj_true);
				be_emit_finish_line_gas(proj_true);
842
843
844
845
				break;

			case pn_Cmp_Eq:
			case pn_Cmp_Lt:
846
847
848
849
850
851
852
853
854
855
			case pn_Cmp_Le:
				/* we need a local label if the false proj is a fallthrough
				 * as the falseblock might have no label emitted then */
				if (get_cfop_target_block(proj_false) == next_block) {
					need_parity_label = 1;
					be_emit_cstring("\tjp 1f");
				} else {
					be_emit_cstring("\tjp ");
					ia32_emit_cfop_target(proj_false);
				}
856
				be_emit_finish_line_gas(proj_false);
857
				goto emit_jcc;
858
859
860

			case pn_Cmp_Ug:
			case pn_Cmp_Uge:
861
			case pn_Cmp_Ne:
862
863
864
				be_emit_cstring("\tjp ");
				ia32_emit_cfop_target(proj_true);
				be_emit_finish_line_gas(proj_true);
865
				goto emit_jcc;
866
867
868
869
870
871

			default:
				goto emit_jcc;
		}
	} else {
emit_jcc:
872
873
874
875
876
		be_emit_cstring("\tj");
		ia32_emit_cmp_suffix(pnc);
		be_emit_char(' ');
		ia32_emit_cfop_target(proj_true);
		be_emit_finish_line_gas(proj_true);
877
878
	}

879
880
881
882
883
	if(need_parity_label) {
		be_emit_cstring("1:");
		be_emit_write_line();
	}

884
	/* the second Proj might be a fallthrough */
885
	if (get_cfop_target_block(proj_false) != next_block) {
886
887
888
		be_emit_cstring("\tjmp ");
		ia32_emit_cfop_target(proj_false);
		be_emit_finish_line_gas(proj_false);
889
	} else {
890
891
892
893
		be_emit_cstring("\t/* fallthrough to ");
		ia32_emit_cfop_target(proj_false);
		be_emit_cstring(" */");
		be_emit_finish_line_gas(proj_false);
894
	}
Michael Beck's avatar
Michael Beck committed
895
896
}

897
static void emit_ia32_CMov(const ir_node *node)
Matthias Braun's avatar
Matthias Braun committed
898
{
899
900
901
	const ia32_attr_t     *attr         = get_ia32_attr_const(node);
	int                    ins_permuted = attr->data.ins_permuted;
	const arch_register_t *out          = arch_get_irn_register(arch_env, node);
Michael Beck's avatar
Michael Beck committed
902
	pn_Cmp                 pnc          = get_ia32_condcode(node);
903
904
905
906
907
	const arch_register_t *in_true;
	const arch_register_t *in_false;

	pnc = determine_final_pnc(node, n_ia32_CMov_eflags, pnc);

908
	in_true  = arch_get_irn_register(arch_env,
909
	                                 get_irn_n(node, n_ia32_CMov_val_true));
910
	in_false = arch_get_irn_register(arch_env,
911
912
913
914
915
916
917
918
	                                 get_irn_n(node, n_ia32_CMov_val_false));

	/* should be same constraint fullfilled? */
	if(out == in_false) {
		/* yes -> nothing to do */
	} else if(out == in_true) {
		const arch_register_t *tmp;

919
920
921
		assert(get_ia32_op_type(node) == ia32_Normal);

		ins_permuted = !ins_permuted;
922
923
924
925

		tmp      = in_true;
		in_true  = in_false;
		in_false = tmp;
926
	} else {
927
		/* we need a mov */
928
929
930
931
932
		be_emit_cstring("\tmovl ");
		emit_register(in_false, NULL);
		be_emit_cstring(", ");
		emit_register(out, NULL);
		be_emit_finish_line_gas(node);
933
	}
934

935
936
937
938
939
940
941
942
	if(ins_permuted) {
		if(pnc & ia32_pn_Cmp_float) {
			pnc = get_negated_pnc(pnc, mode_F);
		} else {
			pnc = get_negated_pnc(pnc, mode_Iu);
		}
	}

943
944
	/* TODO: handling of Nans isn't correct yet */

945
946
947
	be_emit_cstring("\tcmov");
	ia32_emit_cmp_suffix(pnc);
	be_emit_char(' ');
948
	if(get_ia32_op_type(node) == ia32_AddrModeS) {
949
		ia32_emit_am(node);
950
	} else {
951
		emit_register(in_true, get_ia32_ls_mode(node));
952
	}
953
954
955
	be_emit_cstring(", ");
	emit_register(out, get_ia32_ls_mode(node));
	be_emit_finish_line_gas(node);
956
957
}

Christian Würdig's avatar
Christian Würdig committed
958
959
960
961
962
963
964
965
966
967
968
969
/*********************************************************
 *                 _ _       _
 *                (_) |     (_)
 *   ___ _ __ ___  _| |_     _ _   _ _ __ ___  _ __  ___
 *  / _ \ '_ ` _ \| | __|   | | | | | '_ ` _ \| '_ \/ __|
 * |  __/ | | | | | | |_    | | |_| | | | | | | |_) \__ \
 *  \___|_| |_| |_|_|\__|   | |\__,_|_| |_| |_| .__/|___/
 *                         _/ |               | |
 *                        |__/                |_|
 *********************************************************/

/* jump table entry (target and corresponding number) */
Christian Würdig's avatar
Christian Würdig committed
970
971
972
973
974
typedef struct _branch_t {
	ir_node *target;
	int      value;
} branch_t;

Christian Würdig's avatar
Christian Würdig committed
975
/* jump table for switch generation */
Christian Würdig's avatar
Christian Würdig committed
976
typedef struct _jmp_tbl_t {
Christian Würdig's avatar
Christian Würdig committed
977
	ir_node  *defProj;         /**< default target */
Matthias Braun's avatar
Matthias Braun committed
978
979
980
	long      min_value;       /**< smallest switch case */
	long      max_value;       /**< largest switch case */
	long      num_branches;    /**< number of jumps */
Christian Würdig's avatar
Christian Würdig committed
981
982
	char     *label;           /**< label of the jump table */
	branch_t *branches;        /**< jump array */
Christian Würdig's avatar
Christian Würdig committed
983
984
} jmp_tbl_t;

Christian Würdig's avatar
Christian Würdig committed
985
986
987
/**
 * Compare two variables of type branch_t. Used to sort all switch cases
 */
988
static int ia32_cmp_branch_t(const void *a, const void *b) {
Christian Würdig's avatar
Christian Würdig committed
989
990
991
992
993
994
995
996
997
998
999
1000
	branch_t *b1 = (branch_t *)a;
	branch_t *b2 = (branch_t *)b;

	if (b1->value <= b2->value)
		return -1;
	else
		return 1;
}

/**
 * Emits code for a SwitchJmp (creates a jump table if
 * possible otherwise a cmp-jmp cascade). Port from
For faster browsing, not all history is shown. View entire blame