================
@@ -5665,6 +5665,32 @@ bool
SelectionDAG::isGuaranteedNotToBeUndefOrPoison(SDValue Op,
}
return true;
+ case ISD::CONCAT_VECTORS: {
+ if (!DemandedElts)
+ return true;
+
+ EVT VT = Op.getValueType();
+ if (!VT.isFixedLengthVector())
+ return all_of(Op->ops(), [&](SDValue V) {
+ return isGuaranteedNotToBeUndefOrPoison(V, Kind, Depth + 1);
+ });
+
+ assert(DemandedElts.getBitWidth() == VT.getVectorNumElements() &&
+ "Unexpected demanded element mask width");
+
+ EVT SubVT = Op.getOperand(0).getValueType();
+ unsigned NumSubElts = SubVT.getVectorNumElements();
+ for (unsigned i = 0, e = Op.getNumOperands(); i != e; ++i) {
----------------
RKSimon wrote:
(style)
```suggestion
for (unsigned I = 0, E = Op.getNumOperands(); I != E; ++I) {
```
https://github.com/llvm/llvm-project/pull/200932
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