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[X86][SSE] Add SimplifyDemandedVectorElts support for X86ISD::BLENDV

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llvm-svn: 353165
This commit is contained in:
Simon Pilgrim 2019-02-05 12:27:29 +00:00
parent 6a67c3821a
commit e83a6e5ac6
2 changed files with 25 additions and 11 deletions
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21
lib/Target/X86/X86ISelLowering.cpp
View File

@ -32838,6 +32838,27 @@ bool X86TargetLowering::SimplifyDemandedVectorEltsForTargetNode(
return true;
break;
}
case X86ISD::BLENDV: {
APInt SelUndef, SelZero;
if (SimplifyDemandedVectorElts(Op.getOperand(0), DemandedElts, SelUndef,
SelZero, TLO, Depth + 1))
return true;
// TODO: Use SelZero to adjust LHS/RHS DemandedElts.
APInt LHSUndef, LHSZero;
if (SimplifyDemandedVectorElts(Op.getOperand(1), DemandedElts, LHSUndef,
LHSZero, TLO, Depth + 1))
return true;
APInt RHSUndef, RHSZero;
if (SimplifyDemandedVectorElts(Op.getOperand(2), DemandedElts, RHSUndef,
RHSZero, TLO, Depth + 1))
return true;
KnownZero = LHSZero & RHSZero;
KnownUndef = LHSUndef & RHSUndef;
break;
}
case X86ISD::VBROADCAST: {
SDValue Src = Op.getOperand(0);
MVT SrcVT = Src.getSimpleValueType();

15
test/CodeGen/X86/combine-sse41-intrinsics.ll
View File

@ -80,9 +80,8 @@ define <8 x i16> @test3_x86_sse41_pblend_w(<8 x i16> %a0) {
define double @demanded_blendvpd(<2 x double> %a0, <2 x double> %a1, <2 x double> %a2) {
; CHECK-LABEL: demanded_blendvpd:
; CHECK: # %bb.0:
; CHECK-NEXT: movddup {{.*#+}} xmm3 = xmm0[0,0]
; CHECK-NEXT: movddup {{.*#+}} xmm1 = xmm1[0,0]
; CHECK-NEXT: movddup {{.*#+}} xmm0 = xmm2[0,0]
; CHECK-NEXT: movapd %xmm0, %xmm3
; CHECK-NEXT: movaps %xmm2, %xmm0
; CHECK-NEXT: blendvpd %xmm0, %xmm1, %xmm3
; CHECK-NEXT: movapd %xmm3, %xmm0
; CHECK-NEXT: retq
@ -98,9 +97,6 @@ define float @demanded_blendvps(<4 x float> %a0, <4 x float> %a1, <4 x float> %a
; CHECK-LABEL: demanded_blendvps:
; CHECK: # %bb.0:
; CHECK-NEXT: movaps %xmm0, %xmm3
; CHECK-NEXT: shufps {{.*#+}} xmm3 = xmm3[0,0],xmm0[0,0]
; CHECK-NEXT: shufps {{.*#+}} xmm1 = xmm1[0,0,0,0]
; CHECK-NEXT: shufps {{.*#+}} xmm2 = xmm2[0,0,0,0]
; CHECK-NEXT: movaps %xmm2, %xmm0
; CHECK-NEXT: blendvps %xmm0, %xmm1, %xmm3
; CHECK-NEXT: movaps %xmm3, %xmm0
@ -117,13 +113,10 @@ define <16 x i8> @demanded_pblendvb(<16 x i8> %a0, <16 x i8> %a1, <16 x i8> %a2)
; CHECK-LABEL: demanded_pblendvb:
; CHECK: # %bb.0:
; CHECK-NEXT: movdqa %xmm0, %xmm3
; CHECK-NEXT: pxor %xmm4, %xmm4
; CHECK-NEXT: pshufb %xmm4, %xmm3
; CHECK-NEXT: pshufb %xmm4, %xmm1
; CHECK-NEXT: pshufb %xmm4, %xmm2
; CHECK-NEXT: movdqa %xmm2, %xmm0
; CHECK-NEXT: pblendvb %xmm0, %xmm1, %xmm3
; CHECK-NEXT: pshufb %xmm4, %xmm3
; CHECK-NEXT: pxor %xmm0, %xmm0
; CHECK-NEXT: pshufb %xmm0, %xmm3
; CHECK-NEXT: movdqa %xmm3, %xmm0
; CHECK-NEXT: retq
%1 = shufflevector <16 x i8> %a0, <16 x i8> undef, <16 x i32> zeroinitializer