[llvm-branch-commits] [llvm] [SelectionDAG] Deal with POISON for INSERT_VECTOR_ELT/INSERT_SUBVECTOR (part 2) (PR #143103)

[Simon Pilgrim via llvm-branch-commits]

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@@ -1881,6 +1881,11 @@ LLVM_ABI SDValue peekThroughExtractSubvectors(SDValue V);
 /// If \p V is not a truncation, it is returned as-is.
 LLVM_ABI SDValue peekThroughTruncates(SDValue V);
 
+/// Recursively peek through INSERT_VECTOR_ELT nodes, returning the source
+/// vector operand of \p V, as long as \p V is an does INSERT_VECTOR_ELT
+/// operation that do not insert into any of the demanded vector elts.
+LLVM_ABI SDValue peekThroughInsertVectorElt(SDValue V, APInt DemandedElts);
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RKSimon wrote:

`const APInt &DemandedElts` (in case vector count > 64)

https://github.com/llvm/llvm-project/pull/143103