[llvm-bugs] [Bug 33038] New: [PBQP] Assertion `!empty() && "empty range"'

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33038

            Bug ID: 33038
           Summary: [PBQP]   Assertion `!empty() && "empty range"'
           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 18440
  --> https://bugs.llvm.org/attachment.cgi?id=18440&action=edit
reduced testcase

It seems that there is an empty LiveRange during PBQP register allocation.

lib/CodeGen/LiveInterval.cpp:392: bool llvm::LiveRange::overlapsFrom(const
llvm::LiveRange&, llvm::LiveRange::const_iterator) const: Assertion `!empty()
&& "empty range"' failed.

llc tc_pbqp.ll -mtriple=s390x-linux-gnu -mcpu=z13 -disable-machine-dce
-regalloc=pbqp

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