From: Bruno Cardoso Lopes <bruno.cardoso@gmail.com>
Date: Thu, 25 Aug 2011 21:40:34 +0000 (+0000)
Subject: Make isMOVDDUP mask check more strict and update comments!
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=06ef923d1491b056555ebcb5cb276f8acd322187;p=oota-llvm.git

Make isMOVDDUP mask check more strict and update comments!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138587 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index eedb1ff7141..80f3e943b54 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -3914,10 +3914,15 @@ bool X86::isMOVSLDUPMask(ShuffleVectorSDNode *N,
 }
 
 /// isMOVDDUPMask - Return true if the specified VECTOR_SHUFFLE operand
-/// specifies a shuffle of elements that is suitable for input to MOVDDUP.
+/// specifies a shuffle of elements that is suitable for input to 128-bit
+/// version of MOVDDUP.
 bool X86::isMOVDDUPMask(ShuffleVectorSDNode *N) {
-  int e = N->getValueType(0).getVectorNumElements() / 2;
+  EVT VT = N->getValueType(0);
+
+  if (VT.getSizeInBits() != 128)
+    return false;
 
+  int e = VT.getVectorNumElements() / 2;
   for (int i = 0; i < e; ++i)
     if (!isUndefOrEqual(N->getMaskElt(i), i))
       return false;