forked from stichnot/subzero
-
Notifications
You must be signed in to change notification settings - Fork 0
/
IceTargetLoweringX8632.cpp
2040 lines (1935 loc) · 79.9 KB
/
IceTargetLoweringX8632.cpp
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
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* Copyright 2014 The Native Client Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can
* be found in the LICENSE file.
*/
#include "IceDefs.h"
#include "IceCfg.h"
#include "IceCfgNode.h"
#include "IceInstX8632.h"
#include "IceOperand.h"
#include "IceTargetLoweringX8632.h"
IceTargetX8632::IceTargetX8632(IceCfg *Cfg)
: IceTargetLowering(Cfg), IsEbpBasedFrame(false), FrameSizeLocals(0),
LocalsSizeBytes(0), NextLabelNumber(0), ComputedLiveRanges(false),
PhysicalRegisters(IceVarList(Reg_NUM)) {
llvm::SmallBitVector IntegerRegisters(Reg_NUM);
llvm::SmallBitVector FloatRegisters(Reg_NUM);
llvm::SmallBitVector InvalidRegisters(Reg_NUM);
for (unsigned i = Reg_eax; i <= Reg_edi; ++i)
IntegerRegisters[i] = true;
for (unsigned i = Reg_xmm0; i <= Reg_xmm7; ++i)
FloatRegisters[i] = true;
TypeToRegisterSet[IceType_void] = InvalidRegisters;
TypeToRegisterSet[IceType_i1] = IntegerRegisters;
TypeToRegisterSet[IceType_i8] = IntegerRegisters;
TypeToRegisterSet[IceType_i16] = IntegerRegisters;
TypeToRegisterSet[IceType_i32] = IntegerRegisters;
TypeToRegisterSet[IceType_i64] = IntegerRegisters;
TypeToRegisterSet[IceType_f32] = FloatRegisters;
TypeToRegisterSet[IceType_f64] = FloatRegisters;
ScratchRegs = FloatRegisters;
ScratchRegs[Reg_eax] = true;
ScratchRegs[Reg_ecx] = true;
ScratchRegs[Reg_edx] = true;
}
void IceTargetX8632::translate(void) {
IceTimer T_placePhiLoads;
Cfg->placePhiLoads();
if (Cfg->hasError())
return;
T_placePhiLoads.printElapsedUs(Cfg->Str, "placePhiLoads()");
IceTimer T_placePhiStores;
Cfg->placePhiStores();
if (Cfg->hasError())
return;
T_placePhiStores.printElapsedUs(Cfg->Str, "placePhiStores()");
IceTimer T_deletePhis;
Cfg->deletePhis();
if (Cfg->hasError())
return;
T_deletePhis.printElapsedUs(Cfg->Str, "deletePhis()");
IceTimer T_renumber1;
Cfg->renumberInstructions();
if (Cfg->hasError())
return;
T_renumber1.printElapsedUs(Cfg->Str, "renumberInstructions()");
if (Cfg->Str.isVerbose())
Cfg->Str << "================ After Phi lowering ================\n";
Cfg->dump();
IceTimer T_doAddressOpt;
Cfg->doAddressOpt();
T_doAddressOpt.printElapsedUs(Cfg->Str, "doAddressOpt()");
// Liveness may be incorrect after address mode optimization.
IceTimer T_renumber2;
Cfg->renumberInstructions();
if (Cfg->hasError())
return;
T_renumber2.printElapsedUs(Cfg->Str, "renumberInstructions()");
// TODO: It should be sufficient to use the fastest livness
// calculation, i.e. IceLiveness_LREndLightweight. However,
// currently this breaks one test (icmp-simple.ll) because with
// IceLiveness_LREndFull, the problematic instructions get dead-code
// eliminated.
IceTimer T_liveness1;
Cfg->liveness(IceLiveness_LREndFull);
if (Cfg->hasError())
return;
T_liveness1.printElapsedUs(Cfg->Str, "liveness()");
if (Cfg->Str.isVerbose())
Cfg->Str
<< "================ After x86 address mode opt ================\n";
Cfg->dump();
IceTimer T_genCode;
Cfg->genCode();
if (Cfg->hasError())
return;
T_genCode.printElapsedUs(Cfg->Str, "genCode()");
IceTimer T_renumber3;
Cfg->renumberInstructions();
if (Cfg->hasError())
return;
T_renumber3.printElapsedUs(Cfg->Str, "renumberInstructions()");
IceTimer T_liveness2;
Cfg->liveness(IceLiveness_RangesFull);
if (Cfg->hasError())
return;
T_liveness2.printElapsedUs(Cfg->Str, "liveness()");
ComputedLiveRanges = true;
if (Cfg->Str.isVerbose())
Cfg->Str
<< "================ After initial x8632 codegen ================\n";
Cfg->dump();
IceTimer T_regAlloc;
Cfg->regAlloc();
if (Cfg->hasError())
return;
T_regAlloc.printElapsedUs(Cfg->Str, "regAlloc()");
if (Cfg->Str.isVerbose())
Cfg->Str
<< "================ After linear scan regalloc ================\n";
Cfg->dump();
IceTimer T_genFrame;
Cfg->genFrame();
if (Cfg->hasError())
return;
T_genFrame.printElapsedUs(Cfg->Str, "genFrame()");
if (Cfg->Str.isVerbose())
Cfg->Str << "================ After stack frame mapping ================\n";
Cfg->dump();
}
IceString IceTargetX8632::RegNames[] = { "eax", "ecx", "edx", "ebx",
"esp", "ebp", "esi", "edi",
"xmm0", "xmm1", "xmm2", "xmm3",
"xmm4", "xmm5", "xmm6", "xmm7" };
IceVariable *IceTargetX8632::getPhysicalRegister(unsigned RegNum) {
assert(RegNum < PhysicalRegisters.size());
IceVariable *Reg = PhysicalRegisters[RegNum];
if (Reg == NULL) {
IceCfgNode *Node = NULL; // NULL means multi-block lifetime
Reg = Cfg->makeVariable(IceType_i32, Node);
Reg->setRegNum(RegNum);
PhysicalRegisters[RegNum] = Reg;
}
return Reg;
}
// Helper function for addProlog(). Sets the frame offset for Arg,
// updates InArgsSizeBytes according to Arg's width, and generates an
// instruction to copy Arg into its assigned register if applicable.
// For an I64 arg that has been split into Low and High components, it
// calls itself recursively on the components, taking care to handle
// Low first because of the little-endian architecture.
void IceTargetX8632::setArgOffsetAndCopy(IceVariable *Arg,
IceVariable *FramePtr,
int BasicFrameOffset,
int &InArgsSizeBytes,
IceInstList &Expansion) {
IceVariable *Low = Arg->getLow();
IceVariable *High = Arg->getHigh();
IceType Type = Arg->getType();
if (Low && High && Type == IceType_i64) {
assert(Low->getType() != IceType_i64); // don't want infinite recursion
assert(High->getType() != IceType_i64); // don't want infinite recursion
setArgOffsetAndCopy(Low, FramePtr, BasicFrameOffset, InArgsSizeBytes,
Expansion);
setArgOffsetAndCopy(High, FramePtr, BasicFrameOffset, InArgsSizeBytes,
Expansion);
return;
}
Arg->setStackOffset(BasicFrameOffset + InArgsSizeBytes);
if (Arg->getRegNum() >= 0) {
// TODO: Uncomment this assert when I64 lowering is complete.
// assert(Type != IceType_i64);
IceOperandX8632Mem *Mem = IceOperandX8632Mem::create(
Cfg, Type, FramePtr,
Cfg->getConstantInt(IceType_i32, Arg->getStackOffset()));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Arg, Mem));
}
InArgsSizeBytes += typeWidthOnStack(Type);
}
void IceTargetX8632::addProlog(IceCfgNode *Node) {
const bool SimpleCoalescing = true;
IceInstList Expansion;
int InArgsSizeBytes = 0;
int RetIpSizeBytes = 4;
int PreservedRegsSizeBytes = 0;
int LocalsSizeBytes = 0;
// Determine stack frame offsets for each IceVariable without a
// register assignment. This can be done as one variable per stack
// slot. Or, do coalescing by running the register allocator again
// with an infinite set of registers (as a side effect, this gives
// variables a second chance at physical register assignment).
//
// A middle ground approach is to leverage sparsity and allocate one
// block of space on the frame for globals (variables with
// multi-block lifetime), and one block to share for locals
// (single-block lifetime).
llvm::SmallBitVector CalleeSaves =
getRegisterSet(IceTargetLowering::RegMask_CalleeSave);
int GlobalsSize = 0;
std::vector<int> LocalsSize(Cfg->getNumNodes());
// Prepass. Compute RegsUsed, PreservedRegsSizeBytes, and
// LocalsSizeBytes.
RegsUsed = llvm::SmallBitVector(CalleeSaves.size());
const IceVarList &Variables = Cfg->getVariables();
const IceVarList &Args = Cfg->getArgs();
for (IceVarList::const_iterator I = Variables.begin(), E = Variables.end();
I != E; ++I) {
IceVariable *Var = *I;
if (!Var)
continue;
if (Var->getRegNum() >= 0) {
RegsUsed[Var->getRegNum()] = true;
continue;
}
if (Var->getIsArg())
continue;
if (ComputedLiveRanges && Var->getLiveRange().isEmpty())
continue;
int Increment = typeWidthOnStack(Var->getType());
if (SimpleCoalescing) {
if (Var->isMultiblockLife()) {
GlobalsSize += Increment;
} else {
unsigned NodeIndex = Var->getLocalUseNode()->getIndex();
LocalsSize[NodeIndex] += Increment;
if (LocalsSize[NodeIndex] > LocalsSizeBytes)
LocalsSizeBytes = LocalsSize[NodeIndex];
}
} else {
LocalsSizeBytes += Increment;
}
}
LocalsSizeBytes += GlobalsSize;
// Add push instructions for preserved registers.
for (unsigned i = 0; i < CalleeSaves.size(); ++i) {
if (CalleeSaves[i] && RegsUsed[i]) {
PreservedRegsSizeBytes += 4;
Expansion.push_back(
IceInstX8632Push::create(Cfg, getPhysicalRegister(i)));
}
}
// Generate "push ebp; mov ebp, esp"
if (IsEbpBasedFrame) {
assert((RegsUsed & getRegisterSet(IceTargetLowering::RegMask_FramePointer))
.count() == 0);
PreservedRegsSizeBytes += 4;
Expansion.push_back(
IceInstX8632Push::create(Cfg, getPhysicalRegister(Reg_ebp)));
Expansion.push_back(IceInstX8632Mov::create(
Cfg, getPhysicalRegister(Reg_ebp), getPhysicalRegister(Reg_esp)));
}
// Generate "sub esp, LocalsSizeBytes"
if (LocalsSizeBytes)
Expansion.push_back(IceInstX8632Sub::create(
Cfg, getPhysicalRegister(Reg_esp),
Cfg->getConstantInt(IceType_i32, LocalsSizeBytes)));
resetStackAdjustment();
// Fill in stack offsets for locals.
int TotalGlobalsSize = GlobalsSize;
GlobalsSize = 0;
LocalsSize.assign(LocalsSize.size(), 0);
int NextStackOffset = 0;
for (IceVarList::const_iterator I = Variables.begin(), E = Variables.end();
I != E; ++I) {
IceVariable *Var = *I;
if (!Var)
continue;
if (Var->getRegNum() >= 0) {
RegsUsed[Var->getRegNum()] = true;
continue;
}
if (Var->getIsArg())
continue;
if (ComputedLiveRanges && Var->getLiveRange().isEmpty())
continue;
int Increment = typeWidthOnStack(Var->getType());
if (SimpleCoalescing) {
if (Var->isMultiblockLife()) {
GlobalsSize += Increment;
NextStackOffset = GlobalsSize;
} else {
unsigned NodeIndex = Var->getLocalUseNode()->getIndex();
LocalsSize[NodeIndex] += Increment;
NextStackOffset = TotalGlobalsSize + LocalsSize[NodeIndex];
}
} else {
NextStackOffset += Increment;
}
if (IsEbpBasedFrame)
Var->setStackOffset(-NextStackOffset);
else
Var->setStackOffset(LocalsSizeBytes - NextStackOffset);
}
LocalsSizeBytes = NextStackOffset;
this->FrameSizeLocals = NextStackOffset;
this->HasComputedFrame = true;
// Fill in stack offsets for args, and copy args into registers for
// those that were register-allocated. Args are pushed right to
// left, so Arg[0] is closest to the stack/frame pointer.
//
// TODO: Make this right for different width args, calling
// conventions, etc. For one thing, args passed in registers will
// need to be copied/shuffled to their home registers (the
// IceRegManager code may have some permutation logic to leverage),
// and if they have no home register, home space will need to be
// allocated on the stack to copy into.
IceVariable *FramePtr = getPhysicalRegister(getFrameOrStackReg());
int BasicFrameOffset = PreservedRegsSizeBytes + RetIpSizeBytes;
if (!IsEbpBasedFrame)
BasicFrameOffset += LocalsSizeBytes;
for (unsigned i = 0; i < Args.size(); ++i) {
IceVariable *Arg = Args[i];
setArgOffsetAndCopy(Arg, FramePtr, BasicFrameOffset, InArgsSizeBytes,
Expansion);
}
// TODO: If esp is adjusted during out-arg writing for a Call, any
// accesses to stack variables need to have their esp or ebp offsets
// adjusted accordingly. This should be tracked by the assembler or
// emitter.
if (Cfg->Str.isVerbose(IceV_Frame)) {
Cfg->Str << "LocalsSizeBytes=" << LocalsSizeBytes << "\n"
<< "InArgsSizeBytes=" << InArgsSizeBytes << "\n"
<< "PreservedRegsSizeBytes=" << PreservedRegsSizeBytes << "\n";
}
Node->insertInsts(Node->getInsts().begin(), Expansion);
}
void IceTargetX8632::addEpilog(IceCfgNode *Node) {
IceInstList Expansion;
IceInstList &Insts = Node->getInsts();
IceInstList::reverse_iterator RI, E;
for (RI = Insts.rbegin(), E = Insts.rend(); RI != E; ++RI) {
if (llvm::isa<IceInstX8632Ret>(*RI))
break;
}
if (RI == E)
return;
if (IsEbpBasedFrame) {
// mov esp, ebp
Expansion.push_back(IceInstX8632Mov::create(
Cfg, getPhysicalRegister(Reg_esp), getPhysicalRegister(Reg_ebp)));
// pop ebp
Expansion.push_back(
IceInstX8632Pop::create(Cfg, getPhysicalRegister(Reg_ebp)));
} else {
// add esp, FrameSizeLocals
if (LocalsSizeBytes)
Expansion.push_back(IceInstX8632Add::create(
Cfg, getPhysicalRegister(Reg_esp),
Cfg->getConstantInt(IceType_i32, FrameSizeLocals)));
}
// Add pop instructions for preserved registers.
llvm::SmallBitVector CalleeSaves =
getRegisterSet(IceTargetLowering::RegMask_CalleeSave);
for (unsigned i = 0; i < CalleeSaves.size(); ++i) {
unsigned j = CalleeSaves.size() - i - 1;
if (j == Reg_ebp && IsEbpBasedFrame)
continue;
if (CalleeSaves[j] && RegsUsed[j]) {
Expansion.push_back(IceInstX8632Pop::create(Cfg, getPhysicalRegister(j)));
}
}
// Convert the reverse_iterator position into its corresponding
// (forward) iterator position.
IceInstList::iterator InsertPoint = RI.base();
--InsertPoint;
Node->insertInsts(InsertPoint, Expansion);
}
void IceTargetX8632::split64(IceVariable *Var) {
switch (Var->getType()) {
default:
return;
case IceType_i64:
// TODO: Only consider F64 if we need to push each half when
// passing as an argument to a function call. Note that each half
// is still typed as I32.
case IceType_f64:
break;
}
IceVariable *Low = Var->getLow();
if (Low) {
assert(Var->getHigh());
return;
}
Low =
Cfg->makeVariable(IceType_i32, CurrentNode, -1, Var->getName() + "__lo");
Var->setLow(Low);
assert(Var->getHigh() == NULL);
IceVariable *High =
Cfg->makeVariable(IceType_i32, CurrentNode, -1, Var->getName() + "__hi");
Var->setHigh(High);
if (Var->getIsArg()) {
Low->setIsArg(Cfg);
High->setIsArg(Cfg);
}
}
IceOperand *IceTargetX8632::makeLowOperand(IceOperand *Operand) {
assert(Operand->getType() == IceType_i64);
if (Operand->getType() != IceType_i64)
return Operand;
if (IceVariable *Var = llvm::dyn_cast<IceVariable>(Operand)) {
split64(Var);
return Var->getLow();
}
if (IceConstantInteger *Const = llvm::dyn_cast<IceConstantInteger>(Operand)) {
uint64_t Mask = (1ul << 32) - 1;
return Cfg->getConstantInt(IceType_i32, Const->getIntValue() & Mask);
}
if (IceOperandX8632Mem *Mem = llvm::dyn_cast<IceOperandX8632Mem>(Operand)) {
return IceOperandX8632Mem::create(Cfg, IceType_i32, Mem->getBase(),
Mem->getOffset(), Mem->getIndex(),
Mem->getShift());
}
assert(0 && "Unsupported operand type");
return NULL;
}
IceOperand *IceTargetX8632::makeHighOperand(IceOperand *Operand) {
assert(Operand->getType() == IceType_i64);
if (Operand->getType() != IceType_i64)
return Operand;
if (IceVariable *Var = llvm::dyn_cast<IceVariable>(Operand)) {
split64(Var);
return Var->getHigh();
}
if (IceConstantInteger *Const = llvm::dyn_cast<IceConstantInteger>(Operand)) {
return Cfg->getConstantInt(IceType_i32, Const->getIntValue() >> 32);
}
if (IceOperandX8632Mem *Mem = llvm::dyn_cast<IceOperandX8632Mem>(Operand)) {
IceConstant *Offset = Mem->getOffset();
if (Offset == NULL)
Offset = Cfg->getConstantInt(IceType_i32, 4);
else if (IceConstantInteger *IntOffset =
llvm::dyn_cast<IceConstantInteger>(Offset)) {
Offset = Cfg->getConstantInt(IceType_i32, 4 + IntOffset->getIntValue());
} else if (IceConstantRelocatable *SymOffset =
llvm::dyn_cast<IceConstantRelocatable>(Offset)) {
// TODO: This creates a new entry in the constant pool, instead
// of reusing the existing entry.
Offset =
Cfg->getConstant(IceType_i32, SymOffset->getHandle(),
4 + SymOffset->getOffset(), SymOffset->getName());
}
return IceOperandX8632Mem::create(Cfg, IceType_i32, Mem->getBase(), Offset,
Mem->getIndex(), Mem->getShift());
}
assert(0 && "Unsupported operand type");
return NULL;
}
llvm::SmallBitVector IceTargetX8632::getRegisterSet(RegSetMask Include,
RegSetMask Exclude) const {
llvm::SmallBitVector Registers(Reg_NUM);
bool Scratch = Include & ~Exclude & RegMask_CallerSave;
bool Preserved = Include & ~Exclude & RegMask_CalleeSave;
Registers[Reg_eax] = Scratch;
Registers[Reg_ecx] = Scratch;
Registers[Reg_edx] = Scratch;
Registers[Reg_ebx] = Preserved;
Registers[Reg_esp] = Include & ~Exclude & RegMask_StackPointer;
// ebp counts as both preserved and frame pointer
Registers[Reg_ebp] = Include & (RegMask_CalleeSave | RegMask_FramePointer);
if (Exclude & (RegMask_CalleeSave | RegMask_FramePointer))
Registers[Reg_ebp] = false;
Registers[Reg_esi] = Preserved;
Registers[Reg_edi] = Preserved;
Registers[Reg_xmm0] = Scratch;
Registers[Reg_xmm1] = Scratch;
Registers[Reg_xmm2] = Scratch;
Registers[Reg_xmm3] = Scratch;
Registers[Reg_xmm4] = Scratch;
Registers[Reg_xmm5] = Scratch;
Registers[Reg_xmm6] = Scratch;
Registers[Reg_xmm7] = Scratch;
return Registers;
}
IceInstList IceTargetX8632::lowerAlloca(const IceInstAlloca *Inst,
const IceInst *Next,
bool &DeleteNextInst) {
IceInstList Expansion;
IsEbpBasedFrame = true;
// TODO(sehr,stichnot): align allocated memory, keep stack aligned, minimize
// the number of adjustments of esp, etc.
IceVariable *Esp = Cfg->getTarget()->getPhysicalRegister(Reg_esp);
IceOperand *ByteCount = Inst->getSrc(0);
IceOperand *TotalSize = legalizeOperand(ByteCount, Legal_All, Expansion);
Expansion.push_back(IceInstX8632Sub::create(Cfg, Esp, TotalSize));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Inst->getDest(), Esp));
return Expansion;
}
IceInstList IceTargetX8632::lowerArithmetic(const IceInstArithmetic *Inst,
const IceInst *Next,
bool &DeleteNextInst) {
IceInstList Expansion;
IceVariable *Dest = Inst->getDest();
IceOperand *Src0 = legalizeOperand(Inst->getSrc(0), Legal_All, Expansion);
IceOperand *Src1 = legalizeOperand(Inst->getSrc(1), Legal_All, Expansion);
IceVariable *Reg0 = NULL;
IceVariable *Reg1 = NULL;
IceOperand *Reg2 = Src1;
bool LowerI64ToI32 = (Dest->getType() == IceType_i64);
IceVariable *DestLo = NULL, *DestHi = NULL;
IceVariable *TmpLo = NULL, *TmpHi = NULL;
IceOperand *Src0Lo = NULL, *Src0Hi = NULL, *Src1Lo = NULL, *Src1Hi = NULL;
if (LowerI64ToI32) {
DestLo = llvm::cast<IceVariable>(makeLowOperand(Dest));
DestHi = llvm::cast<IceVariable>(makeHighOperand(Dest));
Src0Lo = makeLowOperand(Src0);
Src0Hi = makeHighOperand(Src0);
Src1Lo = makeLowOperand(Src1);
Src1Hi = makeHighOperand(Src1);
}
switch (Inst->getOp()) {
case IceInstArithmetic::Add:
if (LowerI64ToI32) {
TmpLo = legalizeOperandToVar(Src0Lo, Expansion);
Expansion.push_back(IceInstX8632Add::create(Cfg, TmpLo, Src1Lo));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestLo, TmpLo));
TmpHi = legalizeOperandToVar(Src0Hi, Expansion);
Expansion.push_back(IceInstX8632Adc::create(Cfg, TmpHi, Src1Hi));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestHi, TmpHi));
} else {
Reg1 = legalizeOperandToVar(Src0, Expansion);
Reg2 = legalizeOperand(Src1, Legal_All, Expansion);
Expansion.push_back(IceInstX8632Add::create(Cfg, Reg1, Reg2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
}
break;
case IceInstArithmetic::And:
if (LowerI64ToI32) {
TmpLo = legalizeOperandToVar(Src0Lo, Expansion);
Expansion.push_back(IceInstX8632And::create(Cfg, TmpLo, Src1Lo));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestLo, TmpLo));
TmpHi = legalizeOperandToVar(Src0Hi, Expansion);
Expansion.push_back(IceInstX8632And::create(Cfg, TmpHi, Src1Hi));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestHi, TmpHi));
} else {
Reg1 = legalizeOperandToVar(Src0, Expansion);
Reg2 = legalizeOperand(Src1, Legal_All, Expansion);
Expansion.push_back(IceInstX8632And::create(Cfg, Reg1, Reg2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
}
break;
case IceInstArithmetic::Or:
if (LowerI64ToI32) {
TmpLo = legalizeOperandToVar(Src0Lo, Expansion);
Expansion.push_back(IceInstX8632Or::create(Cfg, TmpLo, Src1Lo));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestLo, TmpLo));
TmpHi = legalizeOperandToVar(Src0Hi, Expansion);
Expansion.push_back(IceInstX8632Or::create(Cfg, TmpHi, Src1Hi));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestHi, TmpHi));
} else {
Reg1 = legalizeOperandToVar(Src0, Expansion);
Reg2 = legalizeOperand(Src1, Legal_All, Expansion);
Expansion.push_back(IceInstX8632Or::create(Cfg, Reg1, Reg2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
}
break;
case IceInstArithmetic::Xor:
if (LowerI64ToI32) {
TmpLo = legalizeOperandToVar(Src0Lo, Expansion);
Expansion.push_back(IceInstX8632Xor::create(Cfg, TmpLo, Src1Lo));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestLo, TmpLo));
TmpHi = legalizeOperandToVar(Src0Hi, Expansion);
Expansion.push_back(IceInstX8632Xor::create(Cfg, TmpHi, Src1Hi));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestHi, TmpHi));
} else {
Reg1 = legalizeOperandToVar(Src0, Expansion);
Reg2 = legalizeOperand(Src1, Legal_All, Expansion);
Expansion.push_back(IceInstX8632Xor::create(Cfg, Reg1, Reg2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
}
break;
case IceInstArithmetic::Sub:
if (LowerI64ToI32) {
TmpLo = legalizeOperandToVar(Src0Lo, Expansion);
Expansion.push_back(IceInstX8632Sub::create(Cfg, TmpLo, Src1Lo));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestLo, TmpLo));
TmpHi = legalizeOperandToVar(Src0Hi, Expansion);
Expansion.push_back(IceInstX8632Sbb::create(Cfg, TmpHi, Src1Hi));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestHi, TmpHi));
} else {
Reg1 = legalizeOperandToVar(Src0, Expansion);
Reg2 = legalizeOperand(Src1, Legal_All, Expansion);
Expansion.push_back(IceInstX8632Sub::create(Cfg, Reg1, Reg2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
}
break;
case IceInstArithmetic::Mul:
if (LowerI64ToI32) {
IceVariable *Tmp1, *Tmp2, *Tmp3;
IceVariable *Tmp4Lo = Cfg->makeVariable(IceType_i32, CurrentNode);
IceVariable *Tmp4Hi = Cfg->makeVariable(IceType_i32, CurrentNode);
Tmp4Lo->setRegNum(Reg_eax);
Tmp4Hi->setRegNum(Reg_edx);
// gcc does the following:
// a=b*c ==>
// t1 = b.hi; t1 *=(imul) c.lo
// t2 = c.hi; t2 *=(imul) b.lo
// t3:eax = b.lo
// t4.hi:edx,t4.lo:eax = t3:eax *(mul) c.lo
// a.lo = t4.lo
// t4.hi += t1
// t4.hi += t2
// a.hi = t4.hi
Tmp1 = legalizeOperandToVar(Src0Hi, Expansion);
Expansion.push_back(IceInstX8632Imul::create(Cfg, Tmp1, Src1Lo));
Tmp2 = legalizeOperandToVar(Src1Hi, Expansion);
Expansion.push_back(IceInstX8632Imul::create(Cfg, Tmp2, Src0Lo));
Tmp3 = legalizeOperandToVar(Src0Lo, Expansion, false, Reg_eax);
Expansion.push_back(IceInstX8632Mul::create(Cfg, Tmp4Lo, Tmp3, Src1Lo));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestLo, Tmp4Lo));
Expansion.push_back(IceInstFakeDef::create(Cfg, Tmp4Hi, Tmp4Lo));
Expansion.push_back(IceInstX8632Add::create(Cfg, Tmp4Hi, Tmp1));
Expansion.push_back(IceInstX8632Add::create(Cfg, Tmp4Hi, Tmp2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestHi, Tmp4Hi));
} else {
// TODO: Optimize for llvm::isa<IceConstant>(Src1)
// TODO: Strength-reduce multiplications by a constant,
// particularly -1 and powers of 2. Advanced: use lea to
// multiply by 3, 5, 9.
Reg1 = legalizeOperandToVar(Src0, Expansion);
Reg2 = legalizeOperand(Src1, Legal_All, Expansion);
Expansion.push_back(IceInstX8632Imul::create(Cfg, Reg1, Reg2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
}
break;
case IceInstArithmetic::Shl:
if (LowerI64ToI32) {
// TODO: Refactor the similarities between Shl, Lshr, and Ashr.
// gcc does the following:
// a=b<<c ==>
// t1:ecx = c.lo & 0xff // via movzx, we can probably just t1=c.lo
// t2 = b.lo
// t3 = b.hi
// t3 = shld t3, t2, t1
// t2 = shl t2, t1
// test t1, 0x20
// je L1
// use(t3)
// t3 = t2
// t2 = 0
// L1:
// a.lo = t2
// a.hi = t3
IceVariable *Tmp1, *Tmp2, *Tmp3;
IceConstant *BitTest = Cfg->getConstantInt(IceType_i32, 0x20);
IceConstant *Zero = Cfg->getConstantInt(IceType_i32, 0);
IceInstX8632Label *Label = IceInstX8632Label::create(Cfg, this);
Tmp1 = legalizeOperandToVar(Src1Lo, Expansion, false, Reg_ecx);
Tmp2 = legalizeOperandToVar(Src0Lo, Expansion);
Tmp3 = legalizeOperandToVar(Src0Hi, Expansion);
Expansion.push_back(IceInstX8632Shld::create(Cfg, Tmp3, Tmp2, Tmp1));
Expansion.push_back(IceInstX8632Shl::create(Cfg, Tmp2, Tmp1));
Expansion.push_back(IceInstX8632Test::create(Cfg, Tmp1, BitTest));
Expansion.push_back(
IceInstX8632Br::create(Cfg, Label, IceInstX8632Br::Br_e));
Expansion.push_back(IceInstFakeUse::create(Cfg, Tmp3));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Tmp3, Tmp2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Tmp2, Zero));
Expansion.push_back(Label);
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestLo, Tmp2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestHi, Tmp3));
} else {
Reg1 = legalizeOperandToVar(Src0, Expansion);
if (!llvm::isa<IceConstant>(Src1))
Reg2 = legalizeOperandToVar(Src1, Expansion, false, Reg_ecx);
Expansion.push_back(IceInstX8632Shl::create(Cfg, Reg1, Reg2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
}
break;
case IceInstArithmetic::Lshr:
if (LowerI64ToI32) {
// a=b>>c (unsigned) ==>
// t1:ecx = c.lo & 0xff // via movzx, we can probably just t1=c.lo
// t2 = b.lo
// t3 = b.hi
// t2 = shrd t2, t3, t1
// t3 = shr t3, t1
// test t1, 0x20
// je L1
// use(t2)
// t2 = t3
// t3 = 0
// L1:
// a.lo = t2
// a.hi = t3
IceVariable *Tmp1, *Tmp2, *Tmp3;
IceConstant *BitTest = Cfg->getConstantInt(IceType_i32, 0x20);
IceConstant *Zero = Cfg->getConstantInt(IceType_i32, 0);
IceInstX8632Label *Label = IceInstX8632Label::create(Cfg, this);
Tmp1 = legalizeOperandToVar(Src1Lo, Expansion, false, Reg_ecx);
Tmp2 = legalizeOperandToVar(Src0Lo, Expansion);
Tmp3 = legalizeOperandToVar(Src0Hi, Expansion);
Expansion.push_back(IceInstX8632Shrd::create(Cfg, Tmp2, Tmp3, Tmp1));
Expansion.push_back(IceInstX8632Shr::create(Cfg, Tmp3, Tmp1));
Expansion.push_back(IceInstX8632Test::create(Cfg, Tmp1, BitTest));
Expansion.push_back(
IceInstX8632Br::create(Cfg, Label, IceInstX8632Br::Br_e));
Expansion.push_back(IceInstFakeUse::create(Cfg, Tmp2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Tmp2, Tmp3));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Tmp3, Zero));
Expansion.push_back(Label);
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestLo, Tmp2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestHi, Tmp3));
} else {
Reg1 = legalizeOperandToVar(Src0, Expansion);
if (!llvm::isa<IceConstant>(Src1))
Reg2 = legalizeOperandToVar(Src1, Expansion, false, Reg_ecx);
Expansion.push_back(IceInstX8632Shr::create(Cfg, Reg1, Reg2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
}
break;
case IceInstArithmetic::Ashr:
if (LowerI64ToI32) {
// a=b>>c (signed) ==>
// t1:ecx = c.lo & 0xff // via movzx, we can probably just t1=c.lo
// t2 = b.lo
// t3 = b.hi
// t2 = shrd t2, t3, t1
// t3 = sar t3, t1
// test t1, 0x20
// je L1
// use(t2)
// t2 = t3
// t3 = sar t3, 0x1f
// L1:
// a.lo = t2
// a.hi = t3
IceVariable *Tmp1, *Tmp2, *Tmp3;
IceConstant *BitTest = Cfg->getConstantInt(IceType_i32, 0x20);
IceConstant *SignExtend = Cfg->getConstantInt(IceType_i32, 0x1f);
IceInstX8632Label *Label = IceInstX8632Label::create(Cfg, this);
Tmp1 = legalizeOperandToVar(Src1Lo, Expansion, false, Reg_ecx);
Tmp2 = legalizeOperandToVar(Src0Lo, Expansion);
Tmp3 = legalizeOperandToVar(Src0Hi, Expansion);
Expansion.push_back(IceInstX8632Shrd::create(Cfg, Tmp2, Tmp3, Tmp1));
Expansion.push_back(IceInstX8632Sar::create(Cfg, Tmp3, Tmp1));
Expansion.push_back(IceInstX8632Test::create(Cfg, Tmp1, BitTest));
Expansion.push_back(
IceInstX8632Br::create(Cfg, Label, IceInstX8632Br::Br_e));
Expansion.push_back(IceInstFakeUse::create(Cfg, Tmp2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Tmp2, Tmp3));
// Expansion.push_back(IceInstX8632Mov::create(Cfg, Tmp3, Zero));
Expansion.push_back(IceInstX8632Sar::create(Cfg, Tmp3, SignExtend));
Expansion.push_back(Label);
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestLo, Tmp2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, DestHi, Tmp3));
} else {
Reg1 = legalizeOperandToVar(Src0, Expansion);
if (!llvm::isa<IceConstant>(Src1))
Reg2 = legalizeOperandToVar(Src1, Expansion, false, Reg_ecx);
Expansion.push_back(IceInstX8632Sar::create(Cfg, Reg1, Reg2));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
}
break;
case IceInstArithmetic::Udiv:
if (LowerI64ToI32) {
unsigned MaxSrcs = 2;
// TODO: Figure out how to properly construct CallTarget.
IceConstant *CallTarget =
Cfg->getConstant(IceType_i32, NULL, 0, "__udivdi3");
bool Tailcall = false;
// TODO: This instruction leaks.
IceInstCall *Call = IceInstCall::create(Cfg, MaxSrcs, Inst->getDest(),
CallTarget, Tailcall);
Call->addArg(Inst->getSrc(0));
Call->addArg(Inst->getSrc(1));
return lowerCall(Call, NULL, DeleteNextInst);
} else {
Reg1 = legalizeOperandToVar(Src0, Expansion, false, Reg_eax);
Reg0 = Cfg->makeVariable(IceType_i32, CurrentNode);
Reg0->setRegNum(Reg_edx);
IceConstant *ConstZero = Cfg->getConstantInt(IceType_i32, 0);
Expansion.push_back(IceInstX8632Mov::create(Cfg, Reg0, ConstZero));
Reg2 = legalizeOperand(Src1, Legal_All, Expansion);
Expansion.push_back(IceInstX8632Div::create(Cfg, Reg1, Reg2, Reg0));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
}
break;
case IceInstArithmetic::Sdiv:
if (LowerI64ToI32) {
unsigned MaxSrcs = 2;
// TODO: Figure out how to properly construct CallTarget.
IceConstant *CallTarget =
Cfg->getConstant(IceType_i32, NULL, 0, "__divdi3");
bool Tailcall = false;
// TODO: This instruction leaks.
IceInstCall *Call = IceInstCall::create(Cfg, MaxSrcs, Inst->getDest(),
CallTarget, Tailcall);
Call->addArg(Inst->getSrc(0));
Call->addArg(Inst->getSrc(1));
return lowerCall(Call, NULL, DeleteNextInst);
} else {
Reg1 = legalizeOperandToVar(Src0, Expansion, false, Reg_eax);
Reg0 = Cfg->makeVariable(IceType_i32, CurrentNode);
Reg0->setRegNum(Reg_edx);
Expansion.push_back(IceInstX8632Cdq::create(Cfg, Reg0, Reg1));
Reg2 = legalizeOperand(Src1, Legal_All, Expansion);
Expansion.push_back(IceInstX8632Idiv::create(Cfg, Reg1, Reg2, Reg0));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
}
break;
case IceInstArithmetic::Urem:
if (LowerI64ToI32) {
unsigned MaxSrcs = 2;
// TODO: Figure out how to properly construct CallTarget.
IceConstant *CallTarget =
Cfg->getConstant(IceType_i32, NULL, 0, "__umoddi3");
bool Tailcall = false;
// TODO: This instruction leaks.
IceInstCall *Call = IceInstCall::create(Cfg, MaxSrcs, Inst->getDest(),
CallTarget, Tailcall);
Call->addArg(Inst->getSrc(0));
Call->addArg(Inst->getSrc(1));
return lowerCall(Call, NULL, DeleteNextInst);
} else {
Reg1 = legalizeOperandToVar(Src0, Expansion, false, Reg_eax);
Reg0 = Cfg->makeVariable(IceType_i32, CurrentNode);
Reg0->setRegNum(Reg_edx);
IceConstant *ConstZero = Cfg->getConstantInt(IceType_i32, 0);
Expansion.push_back(IceInstX8632Mov::create(Cfg, Reg0, ConstZero));
Reg2 = legalizeOperand(Src1, Legal_All, Expansion);
Expansion.push_back(IceInstX8632Div::create(Cfg, Reg0, Reg2, Reg1));
Reg1 = Reg0;
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
}
break;
case IceInstArithmetic::Srem:
if (LowerI64ToI32) {
unsigned MaxSrcs = 2;
// TODO: Figure out how to properly construct CallTarget.
IceConstant *CallTarget =
Cfg->getConstant(IceType_i32, NULL, 0, "__moddi3");
bool Tailcall = false;
// TODO: This instruction leaks.
IceInstCall *Call = IceInstCall::create(Cfg, MaxSrcs, Inst->getDest(),
CallTarget, Tailcall);
Call->addArg(Inst->getSrc(0));
Call->addArg(Inst->getSrc(1));
return lowerCall(Call, NULL, DeleteNextInst);
} else {
Reg1 = legalizeOperandToVar(Src0, Expansion, false, Reg_eax);
Reg0 = Cfg->makeVariable(IceType_i32, CurrentNode);
Reg0->setRegNum(Reg_edx);
Expansion.push_back(IceInstX8632Cdq::create(Cfg, Reg0, Reg1));
Reg2 = legalizeOperand(Src1, Legal_All, Expansion);
Expansion.push_back(IceInstX8632Idiv::create(Cfg, Reg0, Reg2, Reg1));
Reg1 = Reg0;
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
}
break;
case IceInstArithmetic::Fadd:
// t=src0; t=addss/addsd t, src1; dst=movss/movsd t
Reg1 = legalizeOperandToVar(Src0, Expansion);
Expansion.push_back(IceInstX8632Addss::create(Cfg, Reg1, Src1));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
break;
case IceInstArithmetic::Fsub:
Reg1 = legalizeOperandToVar(Src0, Expansion);
Expansion.push_back(IceInstX8632Subss::create(Cfg, Reg1, Src1));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
break;
case IceInstArithmetic::Fmul:
Reg1 = legalizeOperandToVar(Src0, Expansion);
Expansion.push_back(IceInstX8632Mulss::create(Cfg, Reg1, Src1));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
break;
case IceInstArithmetic::Fdiv:
Reg1 = legalizeOperandToVar(Src0, Expansion);
Expansion.push_back(IceInstX8632Divss::create(Cfg, Reg1, Src1));
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg1));
break;
case IceInstArithmetic::Frem: {
unsigned MaxSrcs = 2;
IceType Type = Dest->getType();
// TODO: Figure out how to properly construct CallTarget.
IceConstant *CallTarget =
Cfg->getConstant(Type, NULL, 0, Type == IceType_f32 ? "fmodf" : "fmod");
bool Tailcall = false;
// TODO: This instruction leaks.
IceInstCall *Call = IceInstCall::create(Cfg, MaxSrcs, Inst->getDest(),
CallTarget, Tailcall);
Call->addArg(Inst->getSrc(0));
Call->addArg(Inst->getSrc(1));
return lowerCall(Call, NULL, DeleteNextInst);
} break;
case IceInstArithmetic::OpKind_NUM:
assert(0);
break;
}
return Expansion;
}
IceInstList IceTargetX8632::lowerAssign(const IceInstAssign *Inst,
const IceInst *Next,
bool &DeleteNextInst) {
IceInstList Expansion;
IceVariable *Dest = Inst->getDest();
IceOperand *Src0 = Inst->getSrc(0);
if (Dest->getType() == IceType_i64) {
// TODO: This seems broken if Src and Dest components are both on
// the stack and not register-allocated.
IceVariable *DestLo = llvm::cast<IceVariable>(makeLowOperand(Dest));
IceVariable *DestHi = llvm::cast<IceVariable>(makeHighOperand(Dest));
Expansion.push_back(
IceInstX8632Mov::create(Cfg, DestLo, makeLowOperand(Src0)));
Expansion.push_back(
IceInstX8632Mov::create(Cfg, DestHi, makeHighOperand(Src0)));
return Expansion;
}
// a=b ==> t=b; a=t; (link t->b)
assert(Dest->getType() == Src0->getType());
IceOperand *Reg =
legalizeOperand(Src0, Legal_Reg | Legal_Imm, Expansion, true);
Expansion.push_back(IceInstX8632Mov::create(Cfg, Dest, Reg));
return Expansion;
}
IceInstList IceTargetX8632::lowerBr(const IceInstBr *Inst, const IceInst *Next,
bool &DeleteNextInst) {
IceInstList Expansion;
if (Inst->getTargetTrue() == NULL) { // unconditional branch
Expansion.push_back(IceInstX8632Br::create(Cfg, Inst->getTargetFalse()));
return Expansion;
}
// cmp src, 0; br ne, labelTrue; br labelFalse
IceOperand *Src = legalizeOperand(Inst->getSrc(0), Legal_All, Expansion);
IceConstant *OpZero = Cfg->getConstantInt(IceType_i32, 0);
Expansion.push_back(IceInstX8632Icmp::create(Cfg, Src, OpZero));
Expansion.push_back(IceInstX8632Br::create(Cfg, Inst->getTargetTrue(),
Inst->getTargetFalse(),
IceInstX8632Br::Br_ne));
return Expansion;
}
IceInstList IceTargetX8632::lowerCall(const IceInstCall *Inst,
const IceInst *Next,
bool &DeleteNextInst) {
// TODO: what to do about tailcalls?
IceInstList Expansion;
// Generate a sequence of push instructions, pushing right to left,
// keeping track of stack offsets in case a push involves a stack
// operand and we are using an esp-based frame.
uint32_t StackOffset = 0;
// TODO: If for some reason the call instruction gets dead-code
// eliminated after lowering, we would need to ensure that the
// pre-call push instructions and the post-call esp adjustment get
// eliminated as well.
for (unsigned NumArgs = Inst->getNumArgs(), i = 0; i < NumArgs; ++i) {
IceOperand *Arg = Inst->getArg(NumArgs - i - 1);
Arg = legalizeOperand(Arg, Legal_All, Expansion);
assert(Arg);
if (Arg->getType() == IceType_i64) {
Expansion.push_back(IceInstX8632Push::create(Cfg, makeHighOperand(Arg)));
Expansion.push_back(IceInstX8632Push::create(Cfg, makeLowOperand(Arg)));
} else if (Arg->getType() == IceType_f64) {
// If the Arg turns out to be a memory operand, we need to push
// 8 bytes, which requires two push instructions. This ends up
// being somewhat clumsy in the current IR, so we use a
// workaround. Force the operand into a (xmm) register, and
// then push the register. An xmm register push is actually not
// possible in x86, but the Push instruction emitter handles
// this by decrementing the stack pointer and directly writing
// the xmm register value.
IceVariable *Var = legalizeOperandToVar(Arg, Expansion);
Expansion.push_back(IceInstX8632Push::create(Cfg, Var));
} else {
Expansion.push_back(IceInstX8632Push::create(Cfg, Arg));
}
StackOffset += typeWidthOnStack(Arg->getType());
}
// Generate the call instruction. Assign its result to a temporary
// with high register allocation weight.
IceVariable *Dest = Inst->getDest();
IceVariable *Reg = NULL; // doubles as RegLo as necessary
IceVariable *RegHi = NULL;
if (Dest) {
switch (Dest->getType()) {
case IceType_NUM: