[llvm-bugs] [Bug 34280] New: coalescer crash

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34280

            Bug ID: 34280
           Summary: coalescer crash
           Product: libraries
           Version: 3.9
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Register Allocator
          Assignee: unassignedbugs at nondot.org
          Reporter: paulsson at linux.vnet.ibm.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 19027
  --> https://bugs.llvm.org/attachment.cgi?id=19027&action=edit
reduced testcase

This is a test case that crashes with seg fault during reg-coalescing. It was
discovered a while back ago and can unfortunately not be reproduced on trunk.
Looking at the logs of the RegisterCoalescer, I suspect the bud may very
well just be hidden now, since I don't see any bugfix for it.

Please check out 4b01366 (r307747) and build llc, and run with:

llc -mtriple=s390x-linux-gnu -mcpu=z13 -O3 -pre-RA-sched=source
./tc_coalescercrash.ll

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