[AArch64] Don't assume extractelt constant index when matching shuffle.
llvm-svn: 257735
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index 4ecfbe9..7763736 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -4864,9 +4864,10 @@
SDValue V = Op.getOperand(i);
if (V.getOpcode() == ISD::UNDEF)
continue;
- else if (V.getOpcode() != ISD::EXTRACT_VECTOR_ELT) {
+ else if (V.getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
+ !isa<ConstantSDNode>(V.getOperand(1))) {
// A shuffle can only come from building a vector from various
- // elements of other vectors.
+ // elements of other vectors, provided their indices are constant.
return SDValue();
}