[llvm-bugs] [Bug 33524] New: Couldn't join subrange unreachable for RegisterCoalescer remat

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Jun 20 02:20:12 PDT 2017


            Bug ID: 33524
           Summary: Couldn't join subrange unreachable for
                    RegisterCoalescer remat
           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 18668
  --> https://bugs.llvm.org/attachment.cgi?id=18668&action=edit
Test case

I'm seeing an issue for the AMDGCN backend (llc -march=amdgcn <testcase>.ll)
where the RegisterCoalescer hits unreachable for a SubRange join

I think I've narrowed this down to an issue in a remat (hence the name)

I've got a potential fix for this that I'll post to reviews.llvm.org (and link
from here)

I've already verified that the fix doesn't make any difference to bug 33152
which superficially seems similar.
bug 32773 may also be related

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