[llvm] r293628 - [X86][SSE] Detect unary PBLEND shuffles.

[Simon Pilgrim via llvm-commits]

Author: rksimon
Date: Tue Jan 31 07:58:01 2017
New Revision: 293628

URL: http://llvm.org/viewvc/llvm-project?rev=293628&view=rev
Log:
[X86][SSE] Detect unary PBLEND shuffles.

These can appear during shuffle combining.

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
    llvm/trunk/test/CodeGen/X86/clear_upper_vector_element_bits.ll

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=293628&r1=293627&r2=293628&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Tue Jan 31 07:58:01 2017
@@ -5397,6 +5397,7 @@ static bool getTargetShuffleMask(SDNode
   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);

Modified: llvm/trunk/test/CodeGen/X86/clear_upper_vector_element_bits.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/clear_upper_vector_element_bits.ll?rev=293628&r1=293627&r2=293628&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/X86/clear_upper_vector_element_bits.ll (original)
+++ llvm/trunk/test/CodeGen/X86/clear_upper_vector_element_bits.ll Tue Jan 31 07:58:01 2017
@@ -94,8 +94,7 @@ define <8 x i16> @_clearupper8xi16a(<8 x
 ;
 ; 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