[llvm-bugs] [Bug 48362] New: opt -jump-threading hangs

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48362

            Bug ID: 48362
           Summary: opt -jump-threading hangs
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: mikael.holmen at ericsson.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 24227
  --> https://bugs.llvm.org/attachment.cgi?id=24227&action=edit
bbi-50589_reduced.ll reproducer

Reproduce with:
 opt -o - bbi-50589_reduced.ll -S -jump-threading 

It doesn't seem to terminate.

This starts happening after 5486e00dc3e3:

    [InstSimplify] remove poison-unsafe insertelement of undef value

    PR45481:
    https://bugs.llvm.org/show_bug.cgi?id=45481

    SDAG has an identical transform to this, so there's little
    chance of any real-world impact. OTOH, that means we are
    effectively sweeping the bug out of sight because poison
    exists in codegen too.

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