[llvm-bugs] [Bug 35373] New: SubRange join failure

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35373

            Bug ID: 35373
           Summary: SubRange join failure
           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 19452
  --> https://bugs.llvm.org/attachment.cgi?id=19452&action=edit
Reproducer for subrange join failure

There are some other SubRange join failures reported, but since the ones I've
investigated have resulted in different fixes I'm filing a fresh one for this
reproducer.

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

The attached reproducer will provoke the problem.

Easiest way to do this is:
llc -march=amdgcn -run-pass simple-register-coalescer -o -
regcoal-subrange-join-seg.mir

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