commit 2091df3d09bba0705fc62d020e5177a246d67978
author Craig Topper <craig.topper@gmail.com> Tue Apr 17 05:54:54 2012 +0000
committer Craig Topper <craig.topper@gmail.com> Tue Apr 17 05:54:54 2012 +0000
tree 51bac4d8849f7e8bf6085f62747cd84260eb4ec1
parent e4576266f49169ad0ae112d9cb565e7d7c4bf24e

Don't decode vperm2i128 or vperm2f128 into a shuffle if bit 3 or 7 of the immediate is set.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154907 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86ISelLowering.cpp

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 8418bb1..1ff60dc 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -4430,6 +4430,7 @@
   case X86ISD::VPERM2X128:
     ImmN = N->getOperand(N->getNumOperands()-1);
     DecodeVPERM2X128Mask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
+    if (Mask.empty()) return false;
     break;
   case X86ISD::MOVDDUP:
   case X86ISD::MOVLHPD: