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 eedb1ff..80f3e94 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -3914,10 +3914,15 @@
}
/// 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;