[llvm-bugs] [Bug 39276] New: [SystemZ + SubregLiveness] Assertion `!NodePtr->isKnownSentinel()' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39276

            Bug ID: 39276
           Summary: [SystemZ + SubregLiveness] Assertion
                    `!NodePtr->isKnownSentinel()' 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

Created attachment 21000
  --> https://bugs.llvm.org/attachment.cgi?id=21000&action=edit
reduced testcase

llc -mtriple=s390x-linux-gnu -mcpu=z13 ./tc-subregliven-coal.ll
-systemz-subreg-liveness -disable-machine-dce

clang-8: /home/ijonpan/llvm/llvm-dev/include/llvm/ADT/ilist_iterator.h:140:
Assertion `!NodePtr->isKnownSentinel()' failed.

#8 0x000002aa30e16ed0 llvm::SystemZRegisterInfo::shouldCoalesce
#9 0x000002aa3119dd8c (anonymous namespace)::RegisterCoalescer::joinCopy

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