From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Tue, 31 Jan 2017 13:58:01 +0000 (+0000)
Subject: [X86][SSE] Detect unary PBLEND shuffles.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=438897d8deb61cfd39e6e5d0c789e7b86afd68c2;p=llvm

[X86][SSE] Detect unary PBLEND shuffles.

These can appear during shuffle combining.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293628 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 6b235d08ce3..f1d6c704017 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -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);
diff --git a/test/CodeGen/X86/clear_upper_vector_element_bits.ll b/test/CodeGen/X86/clear_upper_vector_element_bits.ll
index d22c2e3d98c..bedc68e0000 100644
--- a/test/CodeGen/X86/clear_upper_vector_element_bits.ll
+++ b/test/CodeGen/X86/clear_upper_vector_element_bits.ll
@@ -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