[llvm-bugs] [Bug 33057] New: Regalloc basic asserts with "Interference after spill."

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33057

            Bug ID: 33057
           Summary: Regalloc basic asserts with "Interference after
                    spill."
           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 18450
  --> https://bugs.llvm.org/attachment.cgi?id=18450&action=edit
reduced testcase

llc -mtriple=s390x-linux-gnu -mcpu=z13 -disable-cgp -disable-machine-dce
-regalloc=basic  -o /dev/null ./tc_regallocbasic.ll 

llc: llvm/lib/CodeGen/RegAllocBasic.cpp:253: virtual unsigned int
{anonymous}::RABasic::selectOrSplit(llvm::LiveInterval&,
llvm::SmallVectorImpl<unsigned int>&): Assertion
`!Matrix->checkInterference(VirtReg, *PhysRegI) && "Interference after spill."'
failed.

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