[llvm-bugs] [Bug 40215] New: [RegisterCoalescer] Assertion `ASubValNo != nullptr' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40215

            Bug ID: 40215
           Summary: [RegisterCoalescer]  Assertion `ASubValNo != nullptr'
                    failed.
           Product: libraries
           Version: trunk
          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, quentin.colombet at gmail.com

Created attachment 21290
  --> https://bugs.llvm.org/attachment.cgi?id=21290&action=edit
reduced test case

bin/llc -mcpu=z13 -O3 -systemz-subreg-liveness tc_asubvalno.ll

lib/CodeGen/RegisterCoalescer.cpp:908: std::pair<bool, bool>
{anonymous}::RegisterCoalescer::removeCopyByCommutingDef(const
llvm::CoalescerPair&, llvm::MachineInstr*): Assertion `ASubValNo != nullptr'
failed.

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