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[X86] Don't add DELETED_NODES to DAG combine worklist after calling SimplifyDemandedBits/SimplifyDemandedVectorElts.

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These AddToWorklist calls were added in 84cd968f75bbd6e0fbabecc29d2c1090263adec7.
It's possible the SimplifyDemandedBits/SimplifyDemandedVectorElts
triggered CSE that deleted N. Detect that and avoid adding N
to the worklist.

Fixes PR45067.
This commit is contained in:
Craig Topper 2020-03-01 00:01:38 -08:00
parent ed889a7401
commit b8eb0ad623
2 changed files with 35 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
lib/Target/X86/X86ISelLowering.cpp
View File

@ -42212,6 +42212,7 @@ static SDValue combineMaskedStore(SDNode *N, SelectionDAG &DAG,
if (Mask.getScalarValueSizeInBits() != 1) {
APInt DemandedBits(APInt::getSignMask(VT.getScalarSizeInBits()));
if (TLI.SimplifyDemandedBits(Mask, DemandedBits, DCI)) {
if (N->getOpcode() != ISD::DELETED_NODE)
DCI.AddToWorklist(N);
return SDValue(N, 0);
}
@ -42479,6 +42480,7 @@ static SDValue combineVEXTRACT_STORE(SDNode *N, SelectionDAG &DAG,
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
if (TLI.SimplifyDemandedVectorElts(StoredVal, DemandedElts, KnownUndef,
KnownZero, DCI)) {
if (N->getOpcode() != ISD::DELETED_NODE)
DCI.AddToWorklist(N);
return SDValue(N, 0);
}
@ -43828,6 +43830,7 @@ static SDValue combineBT(SDNode *N, SelectionDAG &DAG,
unsigned BitWidth = N1.getValueSizeInBits();
APInt DemandedMask = APInt::getLowBitsSet(BitWidth, Log2_32(BitWidth));
if (DAG.getTargetLoweringInfo().SimplifyDemandedBits(N1, DemandedMask, DCI)) {
if (N->getOpcode() != ISD::DELETED_NODE)
DCI.AddToWorklist(N);
return SDValue(N, 0);
}
@ -43846,6 +43849,7 @@ static SDValue combineCVTPH2PS(SDNode *N, SelectionDAG &DAG,
APInt DemandedElts = APInt::getLowBitsSet(8, 4);
if (TLI.SimplifyDemandedVectorElts(Src, DemandedElts, KnownUndef, KnownZero,
DCI)) {
if (N->getOpcode() != ISD::DELETED_NODE)
DCI.AddToWorklist(N);
return SDValue(N, 0);
}
@ -44755,6 +44759,7 @@ static SDValue combineX86GatherScatter(SDNode *N, SelectionDAG &DAG,
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
APInt DemandedMask(APInt::getSignMask(Mask.getScalarValueSizeInBits()));
if (TLI.SimplifyDemandedBits(Mask, DemandedMask, DCI)) {
if (N->getOpcode() != ISD::DELETED_NODE)
DCI.AddToWorklist(N);
return SDValue(N, 0);
}
@ -44847,6 +44852,7 @@ static SDValue combineGatherScatter(SDNode *N, SelectionDAG &DAG,
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
APInt DemandedMask(APInt::getSignMask(Mask.getScalarValueSizeInBits()));
if (TLI.SimplifyDemandedBits(Mask, DemandedMask, DCI)) {
if (N->getOpcode() != ISD::DELETED_NODE)
DCI.AddToWorklist(N);
return SDValue(N, 0);
}

23
test/CodeGen/X86/pr45067.ll Normal file
View File

@ -0,0 +1,23 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=skylake | FileCheck %s
@global = external global i32, align 4
define void @foo(<8 x i32>* %x, <8 x i1> %y) {
; CHECK-LABEL: foo:
; CHECK: ## %bb.0:
; CHECK-NEXT: vpcmpeqd %xmm1, %xmm1, %xmm1
; CHECK-NEXT: vpbroadcastq _global@{{.*}}(%rip), %ymm2
; CHECK-NEXT: vpgatherqd %xmm1, (,%ymm2), %xmm3
; CHECK-NEXT: vpmovzxwd {{.*#+}} ymm0 = xmm0[0],zero,xmm0[1],zero,xmm0[2],zero,xmm0[3],zero,xmm0[4],zero,xmm0[5],zero,xmm0[6],zero,xmm0[7],zero
; CHECK-NEXT: vpslld $31, %ymm0, %ymm0
; CHECK-NEXT: vinserti128 $1, %xmm3, %ymm3, %ymm1
; CHECK-NEXT: vpmaskmovd %ymm1, %ymm0, (%rdi)
; CHECK-NEXT: ud2
%tmp = call <8 x i32> @llvm.masked.gather.v8i32.v8p0i32(<8 x i32*> <i32* @global, i32* @global, i32* @global, i32* @global, i32* @global, i32* @global, i32* @global, i32* @global>, i32 4, <8 x i1> <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>, <8 x i32> undef)
call void @llvm.masked.store.v8i32.p0v8i32(<8 x i32> %tmp, <8 x i32>* %x, i32 4, <8 x i1> %y)
unreachable
}
declare <8 x i32> @llvm.masked.gather.v8i32.v8p0i32(<8 x i32*>, i32, <8 x i1>, <8 x i32>)
declare void @llvm.masked.store.v8i32.p0v8i32(<8 x i32>, <8 x i32>*, i32, <8 x i1>)