[llvm-bugs] [Bug 41372] New: [Subreg liveness] Assertion `INext != E && "Must have following segment"' failed

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41372

            Bug ID: 41372
           Summary: [Subreg liveness]  Assertion `INext != E && "Must have
                    following segment"' 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 21726
  --> https://bugs.llvm.org/attachment.cgi?id=21726&action=edit
reduced testcase

llc -mcpu=z13 -O3 -o out.s -misched=ilpmin -systemz-subreg-liveness
tc_musthavefollseg.ll

llc: llvm/llvm-dev/lib/CodeGen/LiveIntervals.cpp:1142: void
llvm::LiveIntervals::HMEditor::handleMoveDown(llvm::LiveRange&)
: Assertion `INext != E && "Must have following segment"' failed.

Stack dump:
0.      Program arguments: llc -mcpu=z13 -O3 -o out.s -misched=ilpmin
-systemz-subreg-liveness tc_musthavefollseg.ll 
2.      Running pass 'Machine Instruction Scheduler' on function '@main'

...
 #9 0x000002aa3522b370
llvm::LiveIntervals::HMEditor::updateRange(llvm::LiveRange&, unsigned int,
llvm::LaneBitmask)
#10 0x000002aa3522bae4
llvm::LiveIntervals::HMEditor::updateAllRanges(llvm::MachineInstr*) 
#11 0x000002aa3522eb50 llvm::LiveIntervals::handleMove(llvm::MachineInstr&,
bool) 
#12 0x000002aa353563d4
llvm::ScheduleDAGMI::moveInstruction(llvm::MachineInstr*,
llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>)
...

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