[llvm-bugs] [Bug 42689] New: [DAGCombine] insert/extract_vector_elt with undef index -> undef

[via llvm-bugs]

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: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: llvm-bugs at lists.llvm.org, spatel+llvm at 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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