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[X86][AVX] Add X86ISD::VTRUNC handling to SimplifyDemandedVectorEltsForTargetNode 

llvm-svn: 356067
This commit is contained in:
Simon Pilgrim 2019-03-13 17:00:18 +00:00
parent 823d9f3cdf
commit bef4fe056d
2 changed files with 16 additions and 2 deletions
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14
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -33039,6 +33039,20 @@ bool X86TargetLowering::SimplifyDemandedVectorEltsForTargetNode(
return true;
break;
}
case X86ISD::VTRUNC:
case X86ISD::VTRUNCS:
case X86ISD::VTRUNCUS: {
SDValue Src = Op.getOperand(0);
MVT SrcVT = Src.getSimpleValueType();
APInt DemandedSrc = DemandedElts.zextOrTrunc(SrcVT.getVectorNumElements());
APInt SrcUndef, SrcZero;
if (SimplifyDemandedVectorElts(Src, DemandedSrc, SrcUndef, SrcZero, TLO,
Depth + 1))
return true;
KnownZero = SrcZero.zextOrTrunc(NumElts);
KnownUndef = SrcUndef.zextOrTrunc(NumElts);
break;
}
case X86ISD::BLENDV: {
APInt SelUndef, SelZero;
if (SimplifyDemandedVectorElts(Op.getOperand(0), DemandedElts, SelUndef,

4
llvm/test/CodeGen/X86/shuffle-vs-trunc-256-widen.ll
View File

@ -1179,7 +1179,7 @@ define void @trunc_v4i64_to_v4i8(<32 x i8>* %L, <4 x i8>* %S) nounwind {
;
; AVX512F-LABEL: trunc_v4i64_to_v4i8:
; AVX512F: # %bb.0:
; AVX512F-NEXT: vbroadcasti64x4 {{.*#+}} zmm0 = mem[0,1,2,3,0,1,2,3]
; AVX512F-NEXT: vmovdqa (%rdi), %ymm0
; AVX512F-NEXT: vpmovqb %zmm0, %xmm0
; AVX512F-NEXT: vmovd %xmm0, (%rsi)
; AVX512F-NEXT: vzeroupper
@ -1194,7 +1194,7 @@ define void @trunc_v4i64_to_v4i8(<32 x i8>* %L, <4 x i8>* %S) nounwind {
;
; AVX512BW-LABEL: trunc_v4i64_to_v4i8:
; AVX512BW: # %bb.0:
; AVX512BW-NEXT: vbroadcasti64x4 {{.*#+}} zmm0 = mem[0,1,2,3,0,1,2,3]
; AVX512BW-NEXT: vmovdqa (%rdi), %ymm0
; AVX512BW-NEXT: vpmovqb %zmm0, %xmm0
; AVX512BW-NEXT: vmovd %xmm0, (%rsi)
; AVX512BW-NEXT: vzeroupper