[llvm-bugs] [Bug 35374] New: SubRange join failure with odd SubRange segments

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35374

            Bug ID: 35374
           Summary: SubRange join failure with odd SubRange segments
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Register Allocator
          Assignee: unassignedbugs at nondot.org
          Reporter: david.stuttard at amd.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 19453
  --> https://bugs.llvm.org/attachment.cgi?id=19453&action=edit
llvm-ir based reproducer for the bug

Another SubRange join failure. Distinct from others already reported (as far as
I can tell).

See bug 35373, bug 33524, bug 33152 and bug 32773 for details of the others.

Attached is a reproducer - transforming this to .mir doesn't work as it no
longer provokes the problem so it's a .ll instead

Initial investigation seems to suggest this is probably due to SubRanges having
Segments of the form [1234r, 1234d:0) as in other cases (just in a different
place).

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