summaryrefslogtreecommitdiff
path: root/pcre/sljit/sljitNativeX86_32.c
blob: 34a3a3d940247ab513b8a2d2c283b1edd823b16a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
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
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
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
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
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
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
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
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
/*
 *    Stack-less Just-In-Time compiler
 *
 *    Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright notice, this list of
 *      conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright notice, this list
 *      of conditions and the following disclaimer in the documentation and/or other materials
 *      provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/* x86 32-bit arch dependent functions. */

static sljit_s32 emit_do_imm(struct sljit_compiler *compiler, sljit_u8 opcode, sljit_sw imm)
{
	sljit_u8 *inst;

	inst = (sljit_u8*)ensure_buf(compiler, 1 + 1 + sizeof(sljit_sw));
	FAIL_IF(!inst);
	INC_SIZE(1 + sizeof(sljit_sw));
	*inst++ = opcode;
	sljit_unaligned_store_sw(inst, imm);
	return SLJIT_SUCCESS;
}

static sljit_u8* generate_far_jump_code(struct sljit_jump *jump, sljit_u8 *code_ptr, sljit_sw executable_offset)
{
	sljit_s32 type = jump->flags >> TYPE_SHIFT;

	if (type == SLJIT_JUMP) {
		*code_ptr++ = JMP_i32;
		jump->addr++;
	}
	else if (type >= SLJIT_FAST_CALL) {
		*code_ptr++ = CALL_i32;
		jump->addr++;
	}
	else {
		*code_ptr++ = GROUP_0F;
		*code_ptr++ = get_jump_code(type);
		jump->addr += 2;
	}

	if (jump->flags & JUMP_LABEL)
		jump->flags |= PATCH_MW;
	else
		sljit_unaligned_store_sw(code_ptr, jump->u.target - (jump->addr + 4) - (sljit_uw)executable_offset);
	code_ptr += 4;

	return code_ptr;
}

SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_enter(struct sljit_compiler *compiler,
	sljit_s32 options, sljit_s32 arg_types, sljit_s32 scratches, sljit_s32 saveds,
	sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size)
{
	sljit_s32 args, size;
	sljit_u8 *inst;

	CHECK_ERROR();
	CHECK(check_sljit_emit_enter(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size));
	set_emit_enter(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size);

	args = get_arg_count(arg_types);
	compiler->args = args;

	/* [esp+0] for saving temporaries and function calls. */
	compiler->stack_tmp_size = 2 * sizeof(sljit_sw);

#if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	if (scratches > 3)
		compiler->stack_tmp_size = 3 * sizeof(sljit_sw);
#endif

	compiler->saveds_offset = compiler->stack_tmp_size;
	if (scratches > 3)
		compiler->saveds_offset += ((scratches > (3 + 6)) ? 6 : (scratches - 3)) * sizeof(sljit_sw);

	compiler->locals_offset = compiler->saveds_offset;

	if (saveds > 3)
		compiler->locals_offset += (saveds - 3) * sizeof(sljit_sw);

	if (options & SLJIT_F64_ALIGNMENT)
		compiler->locals_offset = (compiler->locals_offset + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1);

	size = 1 + (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3);
#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	size += (args > 0 ? (args * 2) : 0) + (args > 2 ? 2 : 0);
#else
	size += (args > 0 ? (2 + args * 3) : 0);
#endif
	inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
	FAIL_IF(!inst);

	INC_SIZE(size);
	PUSH_REG(reg_map[TMP_REG1]);
#if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	if (args > 0) {
		*inst++ = MOV_r_rm;
		*inst++ = MOD_REG | (reg_map[TMP_REG1] << 3) | 0x4 /* esp */;
	}
#endif
	if (saveds > 2 || scratches > 9)
		PUSH_REG(reg_map[SLJIT_S2]);
	if (saveds > 1 || scratches > 10)
		PUSH_REG(reg_map[SLJIT_S1]);
	if (saveds > 0 || scratches > 11)
		PUSH_REG(reg_map[SLJIT_S0]);

#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	if (args > 0) {
		inst[0] = MOV_r_rm;
		inst[1] = MOD_REG | (reg_map[SLJIT_S0] << 3) | reg_map[SLJIT_R2];
		inst += 2;
	}
	if (args > 1) {
		inst[0] = MOV_r_rm;
		inst[1] = MOD_REG | (reg_map[SLJIT_S1] << 3) | reg_map[SLJIT_R1];
		inst += 2;
	}
	if (args > 2) {
		inst[0] = MOV_r_rm;
		inst[1] = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | 0x4 /* esp */;
		inst[2] = 0x24;
		inst[3] = sizeof(sljit_sw) * (3 + 2); /* saveds >= 3 as well. */
	}
#else
	if (args > 0) {
		inst[0] = MOV_r_rm;
		inst[1] = MOD_DISP8 | (reg_map[SLJIT_S0] << 3) | reg_map[TMP_REG1];
		inst[2] = sizeof(sljit_sw) * 2;
		inst += 3;
	}
	if (args > 1) {
		inst[0] = MOV_r_rm;
		inst[1] = MOD_DISP8 | (reg_map[SLJIT_S1] << 3) | reg_map[TMP_REG1];
		inst[2] = sizeof(sljit_sw) * 3;
		inst += 3;
	}
	if (args > 2) {
		inst[0] = MOV_r_rm;
		inst[1] = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | reg_map[TMP_REG1];
		inst[2] = sizeof(sljit_sw) * 4;
	}
#endif

	SLJIT_ASSERT(SLJIT_LOCALS_OFFSET > 0);

#if defined(__APPLE__)
	/* Ignore pushed registers and SLJIT_LOCALS_OFFSET when computing the aligned local size. */
	saveds = (2 + (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
	local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
#else
	if (options & SLJIT_F64_ALIGNMENT)
		local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1));
	else
		local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_sw) - 1) & ~(sizeof(sljit_sw) - 1));
#endif

	compiler->local_size = local_size;

#ifdef _WIN32
	if (local_size > 0) {
		if (local_size <= 4 * 4096) {
			if (local_size > 4096)
				EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -4096);
			if (local_size > 2 * 4096)
				EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -4096 * 2);
			if (local_size > 3 * 4096)
				EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -4096 * 3);
		}
		else {
			EMIT_MOV(compiler, SLJIT_R0, 0, SLJIT_SP, 0);
			EMIT_MOV(compiler, SLJIT_R1, 0, SLJIT_IMM, (local_size - 1) >> 12);

			SLJIT_ASSERT (reg_map[SLJIT_R0] == 0);

			EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_R0), -4096);
			FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
				SLJIT_R0, 0, SLJIT_R0, 0, SLJIT_IMM, 4096));
			FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
				SLJIT_R1, 0, SLJIT_R1, 0, SLJIT_IMM, 1));

			inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
			FAIL_IF(!inst);

			INC_SIZE(2);
			inst[0] = JNE_i8;
			inst[1] = (sljit_s8) -16;
		}

		EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -local_size);
	}
#endif

	SLJIT_ASSERT(local_size > 0);

#if !defined(__APPLE__)
	if (options & SLJIT_F64_ALIGNMENT) {
		EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_SP, 0);

		/* Some space might allocated during sljit_grow_stack() above on WIN32. */
		FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
			SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, local_size + sizeof(sljit_sw)));

#if defined _WIN32 && !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
		if (compiler->local_size > 1024)
			FAIL_IF(emit_cum_binary(compiler, BINARY_OPCODE(ADD),
				TMP_REG1, 0, TMP_REG1, 0, SLJIT_IMM, sizeof(sljit_sw)));
#endif

		inst = (sljit_u8*)ensure_buf(compiler, 1 + 6);
		FAIL_IF(!inst);

		INC_SIZE(6);
		inst[0] = GROUP_BINARY_81;
		inst[1] = MOD_REG | AND | reg_map[SLJIT_SP];
		sljit_unaligned_store_sw(inst + 2, ~(sizeof(sljit_f64) - 1));

		/* The real local size must be used. */
		return emit_mov(compiler, SLJIT_MEM1(SLJIT_SP), compiler->local_size, TMP_REG1, 0);
	}
#endif
	return emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
		SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, local_size);
}

SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_set_context(struct sljit_compiler *compiler,
	sljit_s32 options, sljit_s32 arg_types, sljit_s32 scratches, sljit_s32 saveds,
	sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size)
{
	CHECK_ERROR();
	CHECK(check_sljit_set_context(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size));
	set_set_context(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size);

	compiler->args = get_arg_count(arg_types);

	/* [esp+0] for saving temporaries and function calls. */
	compiler->stack_tmp_size = 2 * sizeof(sljit_sw);

#if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	if (scratches > 3)
		compiler->stack_tmp_size = 3 * sizeof(sljit_sw);
#endif

	compiler->saveds_offset = compiler->stack_tmp_size;
	if (scratches > 3)
		compiler->saveds_offset += ((scratches > (3 + 6)) ? 6 : (scratches - 3)) * sizeof(sljit_sw);

	compiler->locals_offset = compiler->saveds_offset;

	if (saveds > 3)
		compiler->locals_offset += (saveds - 3) * sizeof(sljit_sw);

	if (options & SLJIT_F64_ALIGNMENT)
		compiler->locals_offset = (compiler->locals_offset + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1);

#if defined(__APPLE__)
	saveds = (2 + (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
	compiler->local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
#else
	if (options & SLJIT_F64_ALIGNMENT)
		compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1));
	else
		compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_sw) - 1) & ~(sizeof(sljit_sw) - 1));
#endif
	return SLJIT_SUCCESS;
}

SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_return(struct sljit_compiler *compiler, sljit_s32 op, sljit_s32 src, sljit_sw srcw)
{
	sljit_s32 size;
	sljit_u8 *inst;

	CHECK_ERROR();
	CHECK(check_sljit_emit_return(compiler, op, src, srcw));
	SLJIT_ASSERT(compiler->args >= 0);

	FAIL_IF(emit_mov_before_return(compiler, op, src, srcw));

	SLJIT_ASSERT(compiler->local_size > 0);

#if !defined(__APPLE__)
	if (compiler->options & SLJIT_F64_ALIGNMENT)
		EMIT_MOV(compiler, SLJIT_SP, 0, SLJIT_MEM1(SLJIT_SP), compiler->local_size)
	else
		FAIL_IF(emit_cum_binary(compiler, BINARY_OPCODE(ADD),
			SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, compiler->local_size));
#else
	FAIL_IF(emit_cum_binary(compiler, BINARY_OPCODE(ADD),
		SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, compiler->local_size));
#endif

	size = 2 + (compiler->scratches > 7 ? (compiler->scratches - 7) : 0) +
		(compiler->saveds <= 3 ? compiler->saveds : 3);
#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	if (compiler->args > 2)
		size += 2;
#else
	if (compiler->args > 0)
		size += 2;
#endif
	inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
	FAIL_IF(!inst);

	INC_SIZE(size);

	if (compiler->saveds > 0 || compiler->scratches > 11)
		POP_REG(reg_map[SLJIT_S0]);
	if (compiler->saveds > 1 || compiler->scratches > 10)
		POP_REG(reg_map[SLJIT_S1]);
	if (compiler->saveds > 2 || compiler->scratches > 9)
		POP_REG(reg_map[SLJIT_S2]);
	POP_REG(reg_map[TMP_REG1]);
#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	if (compiler->args > 2)
		RET_I16(sizeof(sljit_sw));
	else
		RET();
#else
	RET();
#endif

	return SLJIT_SUCCESS;
}

/* --------------------------------------------------------------------- */
/*  Operators                                                            */
/* --------------------------------------------------------------------- */

/* Size contains the flags as well. */
static sljit_u8* emit_x86_instruction(struct sljit_compiler *compiler, sljit_s32 size,
	/* The register or immediate operand. */
	sljit_s32 a, sljit_sw imma,
	/* The general operand (not immediate). */
	sljit_s32 b, sljit_sw immb)
{
	sljit_u8 *inst;
	sljit_u8 *buf_ptr;
	sljit_s32 flags = size & ~0xf;
	sljit_s32 inst_size;

	/* Both cannot be switched on. */
	SLJIT_ASSERT((flags & (EX86_BIN_INS | EX86_SHIFT_INS)) != (EX86_BIN_INS | EX86_SHIFT_INS));
	/* Size flags not allowed for typed instructions. */
	SLJIT_ASSERT(!(flags & (EX86_BIN_INS | EX86_SHIFT_INS)) || (flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) == 0);
	/* Both size flags cannot be switched on. */
	SLJIT_ASSERT((flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) != (EX86_BYTE_ARG | EX86_HALF_ARG));
	/* SSE2 and immediate is not possible. */
	SLJIT_ASSERT(!(a & SLJIT_IMM) || !(flags & EX86_SSE2));
	SLJIT_ASSERT((flags & (EX86_PREF_F2 | EX86_PREF_F3)) != (EX86_PREF_F2 | EX86_PREF_F3)
		&& (flags & (EX86_PREF_F2 | EX86_PREF_66)) != (EX86_PREF_F2 | EX86_PREF_66)
		&& (flags & (EX86_PREF_F3 | EX86_PREF_66)) != (EX86_PREF_F3 | EX86_PREF_66));

	size &= 0xf;
	inst_size = size;

	if (flags & (EX86_PREF_F2 | EX86_PREF_F3))
		inst_size++;
	if (flags & EX86_PREF_66)
		inst_size++;

	/* Calculate size of b. */
	inst_size += 1; /* mod r/m byte. */
	if (b & SLJIT_MEM) {
		if ((b & REG_MASK) == SLJIT_UNUSED)
			inst_size += sizeof(sljit_sw);
		else if (immb != 0 && !(b & OFFS_REG_MASK)) {
			/* Immediate operand. */
			if (immb <= 127 && immb >= -128)
				inst_size += sizeof(sljit_s8);
			else
				inst_size += sizeof(sljit_sw);
		}

		if ((b & REG_MASK) == SLJIT_SP && !(b & OFFS_REG_MASK))
			b |= TO_OFFS_REG(SLJIT_SP);

		if ((b & OFFS_REG_MASK) != SLJIT_UNUSED)
			inst_size += 1; /* SIB byte. */
	}

	/* Calculate size of a. */
	if (a & SLJIT_IMM) {
		if (flags & EX86_BIN_INS) {
			if (imma <= 127 && imma >= -128) {
				inst_size += 1;
				flags |= EX86_BYTE_ARG;
			} else
				inst_size += 4;
		}
		else if (flags & EX86_SHIFT_INS) {
			imma &= 0x1f;
			if (imma != 1) {
				inst_size ++;
				flags |= EX86_BYTE_ARG;
			}
		} else if (flags & EX86_BYTE_ARG)
			inst_size++;
		else if (flags & EX86_HALF_ARG)
			inst_size += sizeof(short);
		else
			inst_size += sizeof(sljit_sw);
	}
	else
		SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG);

	inst = (sljit_u8*)ensure_buf(compiler, 1 + inst_size);
	PTR_FAIL_IF(!inst);

	/* Encoding the byte. */
	INC_SIZE(inst_size);
	if (flags & EX86_PREF_F2)
		*inst++ = 0xf2;
	if (flags & EX86_PREF_F3)
		*inst++ = 0xf3;
	if (flags & EX86_PREF_66)
		*inst++ = 0x66;

	buf_ptr = inst + size;

	/* Encode mod/rm byte. */
	if (!(flags & EX86_SHIFT_INS)) {
		if ((flags & EX86_BIN_INS) && (a & SLJIT_IMM))
			*inst = (flags & EX86_BYTE_ARG) ? GROUP_BINARY_83 : GROUP_BINARY_81;

		if (a & SLJIT_IMM)
			*buf_ptr = 0;
		else if (!(flags & EX86_SSE2_OP1))
			*buf_ptr = reg_map[a] << 3;
		else
			*buf_ptr = a << 3;
	}
	else {
		if (a & SLJIT_IMM) {
			if (imma == 1)
				*inst = GROUP_SHIFT_1;
			else
				*inst = GROUP_SHIFT_N;
		} else
			*inst = GROUP_SHIFT_CL;
		*buf_ptr = 0;
	}

	if (!(b & SLJIT_MEM))
		*buf_ptr++ |= MOD_REG + ((!(flags & EX86_SSE2_OP2)) ? reg_map[b] : b);
	else if ((b & REG_MASK) != SLJIT_UNUSED) {
		if ((b & OFFS_REG_MASK) == SLJIT_UNUSED || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP)) {
			if (immb != 0) {
				if (immb <= 127 && immb >= -128)
					*buf_ptr |= 0x40;
				else
					*buf_ptr |= 0x80;
			}

			if ((b & OFFS_REG_MASK) == SLJIT_UNUSED)
				*buf_ptr++ |= reg_map[b & REG_MASK];
			else {
				*buf_ptr++ |= 0x04;
				*buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3);
			}

			if (immb != 0) {
				if (immb <= 127 && immb >= -128)
					*buf_ptr++ = immb; /* 8 bit displacement. */
				else {
					sljit_unaligned_store_sw(buf_ptr, immb); /* 32 bit displacement. */
					buf_ptr += sizeof(sljit_sw);
				}
			}
		}
		else {
			*buf_ptr++ |= 0x04;
			*buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3) | (immb << 6);
		}
	}
	else {
		*buf_ptr++ |= 0x05;
		sljit_unaligned_store_sw(buf_ptr, immb); /* 32 bit displacement. */
		buf_ptr += sizeof(sljit_sw);
	}

	if (a & SLJIT_IMM) {
		if (flags & EX86_BYTE_ARG)
			*buf_ptr = imma;
		else if (flags & EX86_HALF_ARG)
			sljit_unaligned_store_s16(buf_ptr, imma);
		else if (!(flags & EX86_SHIFT_INS))
			sljit_unaligned_store_sw(buf_ptr, imma);
	}

	return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1);
}

/* --------------------------------------------------------------------- */
/*  Call / return instructions                                           */
/* --------------------------------------------------------------------- */

#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)

static sljit_s32 c_fast_call_get_stack_size(sljit_s32 arg_types, sljit_s32 *word_arg_count_ptr)
{
	sljit_s32 stack_size = 0;
	sljit_s32 word_arg_count = 0;

	arg_types >>= SLJIT_DEF_SHIFT;

	while (arg_types) {
		switch (arg_types & SLJIT_DEF_MASK) {
		case SLJIT_ARG_TYPE_F32:
			stack_size += sizeof(sljit_f32);
			break;
		case SLJIT_ARG_TYPE_F64:
			stack_size += sizeof(sljit_f64);
			break;
		default:
			word_arg_count++;
			if (word_arg_count > 2)
				stack_size += sizeof(sljit_sw);
			break;
		}

		arg_types >>= SLJIT_DEF_SHIFT;
	}

	if (word_arg_count_ptr)
		*word_arg_count_ptr = word_arg_count;

	return stack_size;
}

static sljit_s32 c_fast_call_with_args(struct sljit_compiler *compiler,
	sljit_s32 arg_types, sljit_s32 stack_size, sljit_s32 word_arg_count, sljit_s32 swap_args)
{
	sljit_u8 *inst;
	sljit_s32 float_arg_count;

	if (stack_size == sizeof(sljit_sw) && word_arg_count == 3) {
		inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
		FAIL_IF(!inst);
		INC_SIZE(1);
		PUSH_REG(reg_map[SLJIT_R2]);
	}
	else if (stack_size > 0) {
		if (word_arg_count >= 4)
			EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), compiler->saveds_offset - sizeof(sljit_sw));

		FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
			SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, stack_size));

		stack_size = 0;
		arg_types >>= SLJIT_DEF_SHIFT;
		word_arg_count = 0;
		float_arg_count = 0;
		while (arg_types) {
			switch (arg_types & SLJIT_DEF_MASK) {
			case SLJIT_ARG_TYPE_F32:
				float_arg_count++;
				FAIL_IF(emit_sse2_store(compiler, 1, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
				stack_size += sizeof(sljit_f32);
				break;
			case SLJIT_ARG_TYPE_F64:
				float_arg_count++;
				FAIL_IF(emit_sse2_store(compiler, 0, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
				stack_size += sizeof(sljit_f64);
				break;
			default:
				word_arg_count++;
				if (word_arg_count == 3) {
					EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), stack_size, SLJIT_R2, 0);
					stack_size += sizeof(sljit_sw);
				}
				else if (word_arg_count == 4) {
					EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), stack_size, TMP_REG1, 0);
					stack_size += sizeof(sljit_sw);
				}
				break;
			}

			arg_types >>= SLJIT_DEF_SHIFT;
		}
	}

	if (word_arg_count > 0) {
		if (swap_args) {
			inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
			FAIL_IF(!inst);
			INC_SIZE(1);

			*inst++ = XCHG_EAX_r | reg_map[SLJIT_R2];
		}
		else {
			inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
			FAIL_IF(!inst);
			INC_SIZE(2);

			*inst++ = MOV_r_rm;
			*inst++ = MOD_REG | (reg_map[SLJIT_R2] << 3) | reg_map[SLJIT_R0];
		}
	}

	return SLJIT_SUCCESS;
}

#endif

static sljit_s32 cdecl_call_get_stack_size(struct sljit_compiler *compiler, sljit_s32 arg_types, sljit_s32 *word_arg_count_ptr)
{
	sljit_s32 stack_size = 0;
	sljit_s32 word_arg_count = 0;

	arg_types >>= SLJIT_DEF_SHIFT;

	while (arg_types) {
		switch (arg_types & SLJIT_DEF_MASK) {
		case SLJIT_ARG_TYPE_F32:
			stack_size += sizeof(sljit_f32);
			break;
		case SLJIT_ARG_TYPE_F64:
			stack_size += sizeof(sljit_f64);
			break;
		default:
			word_arg_count++;
			stack_size += sizeof(sljit_sw);
			break;
		}

		arg_types >>= SLJIT_DEF_SHIFT;
	}

	if (word_arg_count_ptr)
		*word_arg_count_ptr = word_arg_count;

	if (stack_size <= compiler->stack_tmp_size)
		return 0;

#if defined(__APPLE__)
	return ((stack_size - compiler->stack_tmp_size + 15) & ~15);
#else
	return stack_size - compiler->stack_tmp_size;
#endif
}

static sljit_s32 cdecl_call_with_args(struct sljit_compiler *compiler,
	sljit_s32 arg_types, sljit_s32 stack_size, sljit_s32 word_arg_count)
{
	sljit_s32 float_arg_count = 0;

	if (word_arg_count >= 4)
		EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), compiler->saveds_offset - sizeof(sljit_sw));

	if (stack_size > 0)
		FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
			SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, stack_size));

	stack_size = 0;
	word_arg_count = 0;
	arg_types >>= SLJIT_DEF_SHIFT;

	while (arg_types) {
		switch (arg_types & SLJIT_DEF_MASK) {
		case SLJIT_ARG_TYPE_F32:
			float_arg_count++;
			FAIL_IF(emit_sse2_store(compiler, 1, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
			stack_size += sizeof(sljit_f32);
			break;
		case SLJIT_ARG_TYPE_F64:
			float_arg_count++;
			FAIL_IF(emit_sse2_store(compiler, 0, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
			stack_size += sizeof(sljit_f64);
			break;
		default:
			word_arg_count++;
			EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), stack_size, (word_arg_count >= 4) ? TMP_REG1 : word_arg_count, 0);
			stack_size += sizeof(sljit_sw);
			break;
		}

		arg_types >>= SLJIT_DEF_SHIFT;
	}

	return SLJIT_SUCCESS;
}

static sljit_s32 post_call_with_args(struct sljit_compiler *compiler,
	sljit_s32 arg_types, sljit_s32 stack_size)
{
	sljit_u8 *inst;
	sljit_s32 single;

	if (stack_size > 0)
		FAIL_IF(emit_cum_binary(compiler, BINARY_OPCODE(ADD),
			SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, stack_size));

	if ((arg_types & SLJIT_DEF_MASK) < SLJIT_ARG_TYPE_F32)
		return SLJIT_SUCCESS;

	single = ((arg_types & SLJIT_DEF_MASK) == SLJIT_ARG_TYPE_F32);

	inst = (sljit_u8*)ensure_buf(compiler, 1 + 3);
	FAIL_IF(!inst);
	INC_SIZE(3);
	inst[0] = single ? FSTPS : FSTPD;
	inst[1] = (0x03 << 3) | 0x04;
	inst[2] = (0x04 << 3) | reg_map[SLJIT_SP];

	return emit_sse2_load(compiler, single, SLJIT_FR0, SLJIT_MEM1(SLJIT_SP), 0);
}

SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_call(struct sljit_compiler *compiler, sljit_s32 type,
	sljit_s32 arg_types)
{
	struct sljit_jump *jump;
	sljit_s32 stack_size = 0;
	sljit_s32 word_arg_count;

	CHECK_ERROR_PTR();
	CHECK_PTR(check_sljit_emit_call(compiler, type, arg_types));

#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	if ((type & 0xff) == SLJIT_CALL) {
		stack_size = c_fast_call_get_stack_size(arg_types, &word_arg_count);
		PTR_FAIL_IF(c_fast_call_with_args(compiler, arg_types, stack_size, word_arg_count, 0));

#if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \
		|| (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
		compiler->skip_checks = 1;
#endif

		jump = sljit_emit_jump(compiler, type);
		PTR_FAIL_IF(jump == NULL);

		PTR_FAIL_IF(post_call_with_args(compiler, arg_types, 0));
		return jump;
	}
#endif

	stack_size = cdecl_call_get_stack_size(compiler, arg_types, &word_arg_count);
	PTR_FAIL_IF(cdecl_call_with_args(compiler, arg_types, stack_size, word_arg_count));

#if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \
		|| (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
	compiler->skip_checks = 1;
#endif

	jump = sljit_emit_jump(compiler, type);
	PTR_FAIL_IF(jump == NULL);

	PTR_FAIL_IF(post_call_with_args(compiler, arg_types, stack_size));
	return jump;
}

SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_icall(struct sljit_compiler *compiler, sljit_s32 type,
	sljit_s32 arg_types,
	sljit_s32 src, sljit_sw srcw)
{
	sljit_s32 stack_size = 0;
	sljit_s32 word_arg_count;
#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	sljit_s32 swap_args;
#endif

	CHECK_ERROR();
	CHECK(check_sljit_emit_icall(compiler, type, arg_types, src, srcw));

#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	SLJIT_ASSERT(reg_map[SLJIT_R0] == 0 && reg_map[SLJIT_R2] == 1 && SLJIT_R0 == 1 && SLJIT_R2 == 3);

	if ((type & 0xff) == SLJIT_CALL) {
		stack_size = c_fast_call_get_stack_size(arg_types, &word_arg_count);
		swap_args = 0;

		if (word_arg_count > 0) {
			if ((src & REG_MASK) == SLJIT_R2 || OFFS_REG(src) == SLJIT_R2) {
				swap_args = 1;
				if (((src & REG_MASK) | 0x2) == SLJIT_R2)
					src ^= 0x2;
				if ((OFFS_REG(src) | 0x2) == SLJIT_R2)
					src ^= TO_OFFS_REG(0x2);
			}
		}

		FAIL_IF(c_fast_call_with_args(compiler, arg_types, stack_size, word_arg_count, swap_args));

		compiler->saveds_offset += stack_size;
		compiler->locals_offset += stack_size;

#if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \
		|| (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
		compiler->skip_checks = 1;
#endif
		FAIL_IF(sljit_emit_ijump(compiler, type, src, srcw));

		compiler->saveds_offset -= stack_size;
		compiler->locals_offset -= stack_size;

		return post_call_with_args(compiler, arg_types, 0);
	}
#endif

	stack_size = cdecl_call_get_stack_size(compiler, arg_types, &word_arg_count);
	FAIL_IF(cdecl_call_with_args(compiler, arg_types, stack_size, word_arg_count));

	compiler->saveds_offset += stack_size;
	compiler->locals_offset += stack_size;

#if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \
		|| (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
	compiler->skip_checks = 1;
#endif
	FAIL_IF(sljit_emit_ijump(compiler, type, src, srcw));

	compiler->saveds_offset -= stack_size;
	compiler->locals_offset -= stack_size;

	return post_call_with_args(compiler, arg_types, stack_size);
}

SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw dstw)
{
	sljit_u8 *inst;

	CHECK_ERROR();
	CHECK(check_sljit_emit_fast_enter(compiler, dst, dstw));
	ADJUST_LOCAL_OFFSET(dst, dstw);

	CHECK_EXTRA_REGS(dst, dstw, (void)0);

	/* For UNUSED dst. Uncommon, but possible. */
	if (dst == SLJIT_UNUSED)
		dst = TMP_REG1;

	if (FAST_IS_REG(dst)) {
		/* Unused dest is possible here. */
		inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
		FAIL_IF(!inst);

		INC_SIZE(1);
		POP_REG(reg_map[dst]);
		return SLJIT_SUCCESS;
	}

	/* Memory. */
	inst = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw);
	FAIL_IF(!inst);
	*inst++ = POP_rm;
	return SLJIT_SUCCESS;
}

SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_s32 src, sljit_sw srcw)
{
	sljit_u8 *inst;

	CHECK_ERROR();
	CHECK(check_sljit_emit_fast_return(compiler, src, srcw));
	ADJUST_LOCAL_OFFSET(src, srcw);

	CHECK_EXTRA_REGS(src, srcw, (void)0);

	if (FAST_IS_REG(src)) {
		inst = (sljit_u8*)ensure_buf(compiler, 1 + 1 + 1);
		FAIL_IF(!inst);

		INC_SIZE(1 + 1);
		PUSH_REG(reg_map[src]);
	}
	else {
		inst = emit_x86_instruction(compiler, 1, 0, 0, src, srcw);
		FAIL_IF(!inst);
		*inst++ = GROUP_FF;
		*inst |= PUSH_rm;

		inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
		FAIL_IF(!inst);
		INC_SIZE(1);
	}

	RET();
	return SLJIT_SUCCESS;
}