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[X86][SSE] Detect unary PBLEND shuffles. 

These can appear during shuffle combining.

llvm-svn: 293628
This commit is contained in:
Simon Pilgrim 2017-01-31 13:58:01 +00:00
parent c29eab52e8
commit 4eab18f6b8
2 changed files with 2 additions and 2 deletions
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1
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -5397,6 +5397,7 @@ static bool getTargetShuffleMask(SDNode *N, MVT VT, bool AllowSentinelZero,
case X86ISD::BLENDI:
ImmN = N->getOperand(N->getNumOperands()-1);
DecodeBLENDMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
IsUnary = IsFakeUnary = N->getOperand(0) == N->getOperand(1);
break;
case X86ISD::SHUFP:
ImmN = N->getOperand(N->getNumOperands()-1);

3
llvm/test/CodeGen/X86/clear_upper_vector_element_bits.ll
View File

@ -94,8 +94,7 @@ define <8 x i16> @_clearupper8xi16a(<8 x i16>) nounwind {
;
; AVX-LABEL: _clearupper8xi16a:
; AVX: # BB#0:
; AVX-NEXT: vpblendw {{.*#+}} xmm0 = xmm0[0,1,2,3,4,5,6,7]
; AVX-NEXT: vpand {{.*}}(%rip), %xmm0, %xmm0
; AVX-NEXT: vandps {{.*}}(%rip), %xmm0, %xmm0
; AVX-NEXT: retq
%x0 = extractelement <8 x i16> %0, i32 0
%x1 = extractelement <8 x i16> %0, i32 1