[llvm-bugs] [Bug 51097] New: GVN crashes (possible cache bug)

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Wed Jul 14 17:13:55 PDT 2021


            Bug ID: 51097
           Summary: GVN crashes (possible cache bug)
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: jdoerfert at anl.gov
                CC: lebedev.ri at gmail.com, llvm-bugs at lists.llvm.org,
                    wmoses at mit.edu

Created attachment 25025
  --> https://bugs.llvm.org/attachment.cgi?id=25025&action=edit
dominance issue (reduced, still large)

The two attachments crash with different errors after gvn.
One is reduced by llvm-reduce from the other. Manually trimming
some otherwise trivial control flow, e.g. the following empty

A:  br undef, B, C,
B:  br J
C:  br J
J:  br ...

will hide the bug.

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