[llvm-bugs] [Bug 39037] New: llvm-diff fails with "structural differences second time around?" on simple testcase

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39037

            Bug ID: 39037
           Summary: llvm-diff fails with "structural differences second
                    time around?" on simple testcase
           Product: tools
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: analyze
          Assignee: unassignedbugs at nondot.org
          Reporter: Matthew.Arsenault at amd.com
                CC: llvm-bugs at lists.llvm.org, rjmccall at apple.com

Created attachment 20904
  --> https://bugs.llvm.org/attachment.cgi?id=20904&action=edit
Patch with reduced testcase

Reordering the instructions or commuting the operands manages to hide this.

I don't really understand what the assert is complaining about. If I remove it,
it seems to report the correct diff. So far I haven't been able to figure out
exactly what the "first time" would mean here.

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