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[X86] Call SimplifyDemandedBits on conditions of X86ISD::SHRUNKBLEND
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This extends to combineVSelectToShrunkBlend to be able to resimplify SHRUNKBLENDS that have already been created.

This should help some of the regressions from D56387

Differential Revision: https://reviews.llvm.org/D56421

llvm-svn: 350875
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@topperc
topperc committed Jan 10, 2019
1 parent 5610cd8 commit 844f989
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Showing 6 changed files with 105 additions and 111 deletions.
12 changes: 10 additions & 2 deletions llvm/lib/Target/X86/X86ISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -33947,11 +33947,14 @@ static SDValue combineSelectOfTwoConstants(SDNode *N, SelectionDAG &DAG) {
/// If this is a *dynamic* select (non-constant condition) and we can match
/// this node with one of the variable blend instructions, restructure the
/// condition so that blends can use the high (sign) bit of each element.
/// This function will also call SimplfiyDemandedBits on already created
/// SHRUNKBLENDS to perform additional simplifications.
static SDValue combineVSelectToShrunkBlend(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const X86Subtarget &Subtarget) {
SDValue Cond = N->getOperand(0);
if (N->getOpcode() != ISD::VSELECT ||
if ((N->getOpcode() != ISD::VSELECT &&
N->getOpcode() != X86ISD::SHRUNKBLEND) ||
ISD::isBuildVectorOfConstantSDNodes(Cond.getNode()))
return SDValue();

Expand Down Expand Up @@ -33993,7 +33996,9 @@ static SDValue combineVSelectToShrunkBlend(SDNode *N, SelectionDAG &DAG,
// TODO: Add other opcodes eventually lowered into BLEND.
for (SDNode::use_iterator UI = Cond->use_begin(), UE = Cond->use_end();
UI != UE; ++UI)
if (UI->getOpcode() != ISD::VSELECT || UI.getOperandNo() != 0)
if ((UI->getOpcode() != ISD::VSELECT &&
UI->getOpcode() != X86ISD::SHRUNKBLEND) ||
UI.getOperandNo() != 0)
return SDValue();

APInt DemandedMask(APInt::getSignMask(BitWidth));
Expand All @@ -34009,6 +34014,9 @@ static SDValue combineVSelectToShrunkBlend(SDNode *N, SelectionDAG &DAG,
// optimizations as we messed with the actual expectation for the vector
// boolean values.
for (SDNode *U : Cond->uses()) {
if (U->getOpcode() == X86ISD::SHRUNKBLEND)
continue;

SDValue SB = DAG.getNode(X86ISD::SHRUNKBLEND, SDLoc(U), U->getValueType(0),
Cond, U->getOperand(1), U->getOperand(2));
DAG.ReplaceAllUsesOfValueWith(SDValue(U, 0), SB);
Expand Down
2 changes: 0 additions & 2 deletions llvm/test/CodeGen/X86/avx2-logic.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -91,14 +91,12 @@ define <32 x i8> @vpblendvb(<32 x i1> %cond, <32 x i8> %x, <32 x i8> %y) {
; X32-LABEL: vpblendvb:
; X32: # %bb.0:
; X32-NEXT: vpsllw $7, %ymm0, %ymm0
; X32-NEXT: vpand {{\.LCPI.*}}, %ymm0, %ymm0
; X32-NEXT: vpblendvb %ymm0, %ymm1, %ymm2, %ymm0
; X32-NEXT: retl
;
; X64-LABEL: vpblendvb:
; X64: # %bb.0:
; X64-NEXT: vpsllw $7, %ymm0, %ymm0
; X64-NEXT: vpand {{.*}}(%rip), %ymm0, %ymm0
; X64-NEXT: vpblendvb %ymm0, %ymm1, %ymm2, %ymm0
; X64-NEXT: retq
%min = select <32 x i1> %cond, <32 x i8> %x, <32 x i8> %y
Expand Down
43 changes: 20 additions & 23 deletions llvm/test/CodeGen/X86/vector-reduce-smax.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -709,17 +709,16 @@ define i32 @test_v2i32(<2 x i32> %a0) {
; SSE41-NEXT: pshufd {{.*#+}} xmm3 = xmm0[0,2,2,3]
; SSE41-NEXT: psrad $31, %xmm3
; SSE41-NEXT: pblendw {{.*#+}} xmm3 = xmm2[0,1],xmm3[2,3],xmm2[4,5],xmm3[6,7]
; SSE41-NEXT: movdqa {{.*#+}} xmm0 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm3, %xmm2
; SSE41-NEXT: pxor %xmm0, %xmm2
; SSE41-NEXT: pxor %xmm1, %xmm0
; SSE41-NEXT: movdqa %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm2, %xmm4
; SSE41-NEXT: pshufd {{.*#+}} xmm5 = xmm4[0,0,2,2]
; SSE41-NEXT: pcmpeqd %xmm2, %xmm0
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,1,3,3]
; SSE41-NEXT: pand %xmm5, %xmm0
; SSE41-NEXT: por %xmm4, %xmm0
; SSE41-NEXT: movdqa {{.*#+}} xmm2 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm3, %xmm0
; SSE41-NEXT: pxor %xmm2, %xmm0
; SSE41-NEXT: pxor %xmm1, %xmm2
; SSE41-NEXT: movdqa %xmm2, %xmm4
; SSE41-NEXT: pcmpeqd %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm2
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm2[0,0,2,2]
; SSE41-NEXT: pand %xmm4, %xmm0
; SSE41-NEXT: por %xmm2, %xmm0
; SSE41-NEXT: blendvpd %xmm0, %xmm1, %xmm3
; SSE41-NEXT: movd %xmm3, %eax
; SSE41-NEXT: retq
Expand Down Expand Up @@ -1171,12 +1170,11 @@ define i16 @test_v2i16(<2 x i16> %a0) {
; SSE41-NEXT: pxor %xmm0, %xmm2
; SSE41-NEXT: pxor %xmm1, %xmm0
; SSE41-NEXT: movdqa %xmm2, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm4
; SSE41-NEXT: pshufd {{.*#+}} xmm5 = xmm4[0,0,2,2]
; SSE41-NEXT: pcmpeqd %xmm2, %xmm0
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,1,3,3]
; SSE41-NEXT: pand %xmm5, %xmm0
; SSE41-NEXT: por %xmm4, %xmm0
; SSE41-NEXT: pcmpeqd %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm2
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm2[0,0,2,2]
; SSE41-NEXT: pand %xmm4, %xmm0
; SSE41-NEXT: por %xmm2, %xmm0
; SSE41-NEXT: blendvpd %xmm0, %xmm3, %xmm1
; SSE41-NEXT: movd %xmm1, %eax
; SSE41-NEXT: # kill: def $ax killed $ax killed $eax
Expand Down Expand Up @@ -1658,12 +1656,11 @@ define i8 @test_v2i8(<2 x i8> %a0) {
; SSE41-NEXT: pxor %xmm0, %xmm2
; SSE41-NEXT: pxor %xmm1, %xmm0
; SSE41-NEXT: movdqa %xmm2, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm4
; SSE41-NEXT: pshufd {{.*#+}} xmm5 = xmm4[0,0,2,2]
; SSE41-NEXT: pcmpeqd %xmm2, %xmm0
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,1,3,3]
; SSE41-NEXT: pand %xmm5, %xmm0
; SSE41-NEXT: por %xmm4, %xmm0
; SSE41-NEXT: pcmpeqd %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm2
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm2[0,0,2,2]
; SSE41-NEXT: pand %xmm4, %xmm0
; SSE41-NEXT: por %xmm2, %xmm0
; SSE41-NEXT: blendvpd %xmm0, %xmm3, %xmm1
; SSE41-NEXT: pextrb $0, %xmm1, %eax
; SSE41-NEXT: # kill: def $al killed $al killed $eax
Expand Down
63 changes: 30 additions & 33 deletions llvm/test/CodeGen/X86/vector-reduce-smin.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -708,17 +708,16 @@ define i32 @test_v2i32(<2 x i32> %a0) {
; SSE41-NEXT: pshufd {{.*#+}} xmm3 = xmm0[0,2,2,3]
; SSE41-NEXT: psrad $31, %xmm3
; SSE41-NEXT: pblendw {{.*#+}} xmm3 = xmm2[0,1],xmm3[2,3],xmm2[4,5],xmm3[6,7]
; SSE41-NEXT: movdqa {{.*#+}} xmm0 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm1, %xmm2
; SSE41-NEXT: pxor %xmm0, %xmm2
; SSE41-NEXT: pxor %xmm3, %xmm0
; SSE41-NEXT: movdqa %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm2, %xmm4
; SSE41-NEXT: pshufd {{.*#+}} xmm5 = xmm4[0,0,2,2]
; SSE41-NEXT: pcmpeqd %xmm2, %xmm0
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,1,3,3]
; SSE41-NEXT: pand %xmm5, %xmm0
; SSE41-NEXT: por %xmm4, %xmm0
; SSE41-NEXT: movdqa {{.*#+}} xmm2 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm1, %xmm0
; SSE41-NEXT: pxor %xmm2, %xmm0
; SSE41-NEXT: pxor %xmm3, %xmm2
; SSE41-NEXT: movdqa %xmm2, %xmm4
; SSE41-NEXT: pcmpeqd %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm2
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm2[0,0,2,2]
; SSE41-NEXT: pand %xmm4, %xmm0
; SSE41-NEXT: por %xmm2, %xmm0
; SSE41-NEXT: blendvpd %xmm0, %xmm1, %xmm3
; SSE41-NEXT: movd %xmm3, %eax
; SSE41-NEXT: retq
Expand Down Expand Up @@ -1165,17 +1164,16 @@ define i16 @test_v2i16(<2 x i16> %a0) {
; SSE41-NEXT: psrad $16, %xmm1
; SSE41-NEXT: pshufd {{.*#+}} xmm1 = xmm1[1,1,3,3]
; SSE41-NEXT: pblendw {{.*#+}} xmm1 = xmm1[0,1],xmm0[2,3],xmm1[4,5],xmm0[6,7]
; SSE41-NEXT: movdqa {{.*#+}} xmm0 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm3, %xmm2
; SSE41-NEXT: pxor %xmm0, %xmm2
; SSE41-NEXT: pxor %xmm1, %xmm0
; SSE41-NEXT: movdqa %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm2, %xmm4
; SSE41-NEXT: pshufd {{.*#+}} xmm5 = xmm4[0,0,2,2]
; SSE41-NEXT: pcmpeqd %xmm2, %xmm0
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,1,3,3]
; SSE41-NEXT: pand %xmm5, %xmm0
; SSE41-NEXT: por %xmm4, %xmm0
; SSE41-NEXT: movdqa {{.*#+}} xmm2 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm3, %xmm0
; SSE41-NEXT: pxor %xmm2, %xmm0
; SSE41-NEXT: pxor %xmm1, %xmm2
; SSE41-NEXT: movdqa %xmm2, %xmm4
; SSE41-NEXT: pcmpeqd %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm2
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm2[0,0,2,2]
; SSE41-NEXT: pand %xmm4, %xmm0
; SSE41-NEXT: por %xmm2, %xmm0
; SSE41-NEXT: blendvpd %xmm0, %xmm3, %xmm1
; SSE41-NEXT: movd %xmm1, %eax
; SSE41-NEXT: # kill: def $ax killed $ax killed $eax
Expand Down Expand Up @@ -1652,17 +1650,16 @@ define i8 @test_v2i8(<2 x i8> %a0) {
; SSE41-NEXT: psrad $24, %xmm1
; SSE41-NEXT: pshufd {{.*#+}} xmm1 = xmm1[1,1,3,3]
; SSE41-NEXT: pblendw {{.*#+}} xmm1 = xmm1[0,1],xmm0[2,3],xmm1[4,5],xmm0[6,7]
; SSE41-NEXT: movdqa {{.*#+}} xmm0 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm3, %xmm2
; SSE41-NEXT: pxor %xmm0, %xmm2
; SSE41-NEXT: pxor %xmm1, %xmm0
; SSE41-NEXT: movdqa %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm2, %xmm4
; SSE41-NEXT: pshufd {{.*#+}} xmm5 = xmm4[0,0,2,2]
; SSE41-NEXT: pcmpeqd %xmm2, %xmm0
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,1,3,3]
; SSE41-NEXT: pand %xmm5, %xmm0
; SSE41-NEXT: por %xmm4, %xmm0
; SSE41-NEXT: movdqa {{.*#+}} xmm2 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm3, %xmm0
; SSE41-NEXT: pxor %xmm2, %xmm0
; SSE41-NEXT: pxor %xmm1, %xmm2
; SSE41-NEXT: movdqa %xmm2, %xmm4
; SSE41-NEXT: pcmpeqd %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm2
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm2[0,0,2,2]
; SSE41-NEXT: pand %xmm4, %xmm0
; SSE41-NEXT: por %xmm2, %xmm0
; SSE41-NEXT: blendvpd %xmm0, %xmm3, %xmm1
; SSE41-NEXT: pextrb $0, %xmm1, %eax
; SSE41-NEXT: # kill: def $al killed $al killed $eax
Expand Down
33 changes: 15 additions & 18 deletions llvm/test/CodeGen/X86/vector-reduce-umax.ll
View file
Original file line number Diff line number Diff line change
Expand Up @@ -760,12 +760,11 @@ define i32 @test_v2i32(<2 x i32> %a0) {
; SSE41-NEXT: pxor %xmm0, %xmm3
; SSE41-NEXT: pxor %xmm2, %xmm0
; SSE41-NEXT: movdqa %xmm3, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm4
; SSE41-NEXT: pshufd {{.*#+}} xmm5 = xmm4[0,0,2,2]
; SSE41-NEXT: pcmpeqd %xmm3, %xmm0
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,1,3,3]
; SSE41-NEXT: pand %xmm5, %xmm0
; SSE41-NEXT: por %xmm4, %xmm0
; SSE41-NEXT: pcmpeqd %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm3
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm3[0,0,2,2]
; SSE41-NEXT: pand %xmm4, %xmm0
; SSE41-NEXT: por %xmm3, %xmm0
; SSE41-NEXT: blendvpd %xmm0, %xmm1, %xmm2
; SSE41-NEXT: movd %xmm2, %eax
; SSE41-NEXT: retq
Expand Down Expand Up @@ -1248,12 +1247,11 @@ define i16 @test_v2i16(<2 x i16> %a0) {
; SSE41-NEXT: por %xmm0, %xmm3
; SSE41-NEXT: por %xmm2, %xmm0
; SSE41-NEXT: movdqa %xmm3, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm4
; SSE41-NEXT: pshufd {{.*#+}} xmm5 = xmm4[0,0,2,2]
; SSE41-NEXT: pcmpeqd %xmm3, %xmm0
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,1,3,3]
; SSE41-NEXT: pand %xmm5, %xmm0
; SSE41-NEXT: por %xmm4, %xmm0
; SSE41-NEXT: pcmpeqd %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm3
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm3[0,0,2,2]
; SSE41-NEXT: pand %xmm4, %xmm0
; SSE41-NEXT: por %xmm3, %xmm0
; SSE41-NEXT: blendvpd %xmm0, %xmm1, %xmm2
; SSE41-NEXT: movd %xmm2, %eax
; SSE41-NEXT: # kill: def $ax killed $ax killed $eax
Expand Down Expand Up @@ -1803,12 +1801,11 @@ define i8 @test_v2i8(<2 x i8> %a0) {
; SSE41-NEXT: por %xmm3, %xmm4
; SSE41-NEXT: por %xmm2, %xmm3
; SSE41-NEXT: movdqa %xmm4, %xmm0
; SSE41-NEXT: pcmpgtd %xmm3, %xmm0
; SSE41-NEXT: pshufd {{.*#+}} xmm5 = xmm0[0,0,2,2]
; SSE41-NEXT: pcmpeqd %xmm4, %xmm3
; SSE41-NEXT: pshufd {{.*#+}} xmm3 = xmm3[1,1,3,3]
; SSE41-NEXT: pand %xmm5, %xmm3
; SSE41-NEXT: por %xmm3, %xmm0
; SSE41-NEXT: pcmpeqd %xmm3, %xmm0
; SSE41-NEXT: pcmpgtd %xmm3, %xmm4
; SSE41-NEXT: pshufd {{.*#+}} xmm3 = xmm4[0,0,2,2]
; SSE41-NEXT: pand %xmm3, %xmm0
; SSE41-NEXT: por %xmm4, %xmm0
; SSE41-NEXT: blendvpd %xmm0, %xmm1, %xmm2
; SSE41-NEXT: pextrb $0, %xmm2, %eax
; SSE41-NEXT: # kill: def $al killed $al killed $eax
Expand Down
63 changes: 30 additions & 33 deletions llvm/test/CodeGen/X86/vector-reduce-umin.ll
View file
Original file line number Diff line number Diff line change
Expand Up @@ -754,17 +754,16 @@ define i32 @test_v2i32(<2 x i32> %a0) {
; SSE41-NEXT: pblendw {{.*#+}} xmm1 = xmm0[0,1],xmm1[2,3],xmm0[4,5],xmm1[6,7]
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[2,3,0,1]
; SSE41-NEXT: pmovzxdq {{.*#+}} xmm2 = xmm0[0],zero,xmm0[1],zero
; SSE41-NEXT: movdqa {{.*#+}} xmm0 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm1, %xmm3
; SSE41-NEXT: pxor %xmm0, %xmm3
; SSE41-NEXT: pxor %xmm2, %xmm0
; SSE41-NEXT: movdqa %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm3, %xmm4
; SSE41-NEXT: pshufd {{.*#+}} xmm5 = xmm4[0,0,2,2]
; SSE41-NEXT: pcmpeqd %xmm3, %xmm0
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,1,3,3]
; SSE41-NEXT: pand %xmm5, %xmm0
; SSE41-NEXT: por %xmm4, %xmm0
; SSE41-NEXT: movdqa {{.*#+}} xmm3 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm1, %xmm0
; SSE41-NEXT: pxor %xmm3, %xmm0
; SSE41-NEXT: pxor %xmm2, %xmm3
; SSE41-NEXT: movdqa %xmm3, %xmm4
; SSE41-NEXT: pcmpeqd %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm3
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm3[0,0,2,2]
; SSE41-NEXT: pand %xmm4, %xmm0
; SSE41-NEXT: por %xmm3, %xmm0
; SSE41-NEXT: blendvpd %xmm0, %xmm1, %xmm2
; SSE41-NEXT: movd %xmm2, %eax
; SSE41-NEXT: retq
Expand Down Expand Up @@ -1242,17 +1241,16 @@ define i16 @test_v2i16(<2 x i16> %a0) {
; SSE41-NEXT: pblendw {{.*#+}} xmm1 = xmm0[0],xmm1[1,2,3],xmm0[4],xmm1[5,6,7]
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[2,3,0,1]
; SSE41-NEXT: pmovzxwq {{.*#+}} xmm2 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero
; SSE41-NEXT: movdqa {{.*#+}} xmm0 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm1, %xmm3
; SSE41-NEXT: por %xmm0, %xmm3
; SSE41-NEXT: por %xmm2, %xmm0
; SSE41-NEXT: movdqa %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm3, %xmm4
; SSE41-NEXT: pshufd {{.*#+}} xmm5 = xmm4[0,0,2,2]
; SSE41-NEXT: pcmpeqd %xmm3, %xmm0
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,1,3,3]
; SSE41-NEXT: pand %xmm5, %xmm0
; SSE41-NEXT: por %xmm4, %xmm0
; SSE41-NEXT: movdqa {{.*#+}} xmm3 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm1, %xmm0
; SSE41-NEXT: por %xmm3, %xmm0
; SSE41-NEXT: por %xmm2, %xmm3
; SSE41-NEXT: movdqa %xmm3, %xmm4
; SSE41-NEXT: pcmpeqd %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm3
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm3[0,0,2,2]
; SSE41-NEXT: pand %xmm4, %xmm0
; SSE41-NEXT: por %xmm3, %xmm0
; SSE41-NEXT: blendvpd %xmm0, %xmm1, %xmm2
; SSE41-NEXT: movd %xmm2, %eax
; SSE41-NEXT: # kill: def $ax killed $ax killed $eax
Expand Down Expand Up @@ -1704,17 +1702,16 @@ define i8 @test_v2i8(<2 x i8> %a0) {
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[2,3,0,1]
; SSE41-NEXT: pand {{.*}}(%rip), %xmm1
; SSE41-NEXT: pmovzxbq {{.*#+}} xmm2 = xmm0[0],zero,zero,zero,zero,zero,zero,zero,xmm0[1],zero,zero,zero,zero,zero,zero,zero
; SSE41-NEXT: movdqa {{.*#+}} xmm0 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm1, %xmm3
; SSE41-NEXT: por %xmm0, %xmm3
; SSE41-NEXT: por %xmm2, %xmm0
; SSE41-NEXT: movdqa %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm3, %xmm4
; SSE41-NEXT: pshufd {{.*#+}} xmm5 = xmm4[0,0,2,2]
; SSE41-NEXT: pcmpeqd %xmm3, %xmm0
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,1,3,3]
; SSE41-NEXT: pand %xmm5, %xmm0
; SSE41-NEXT: por %xmm4, %xmm0
; SSE41-NEXT: movdqa {{.*#+}} xmm3 = [2147483648,2147483648]
; SSE41-NEXT: movdqa %xmm1, %xmm0
; SSE41-NEXT: por %xmm3, %xmm0
; SSE41-NEXT: por %xmm2, %xmm3
; SSE41-NEXT: movdqa %xmm3, %xmm4
; SSE41-NEXT: pcmpeqd %xmm0, %xmm4
; SSE41-NEXT: pcmpgtd %xmm0, %xmm3
; SSE41-NEXT: pshufd {{.*#+}} xmm0 = xmm3[0,0,2,2]
; SSE41-NEXT: pand %xmm4, %xmm0
; SSE41-NEXT: por %xmm3, %xmm0
; SSE41-NEXT: blendvpd %xmm0, %xmm1, %xmm2
; SSE41-NEXT: pextrb $0, %xmm2, %eax
; SSE41-NEXT: # kill: def $al killed $al killed $eax
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