https://bugs.llvm.org/show_bug.cgi?id=42689
Bug ID: 42689
Summary: [DAGCombine] insert/extract_vector_elt with undef
index -> undef
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: llvm-bugs@lists.llvm.org, spatel+l...@rotateright.com
https://godbolt.org/z/Ycu5dN
I noticed this while triaging
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6674
InstSimplify will fold insert/extract vector element nodes with an UNDEF index
to an UNDEF result, but we don't touch them in DAG.
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