[llvm-bugs] [Bug 26991] New: Assertion failure in register coalescer with AMDGPU backend

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26991

            Bug ID: 26991
           Summary: Assertion failure in register coalescer with AMDGPU
                    backend
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Register Allocator
          Assignee: unassignedbugs at nondot.org
          Reporter: tstellar at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 16050
  --> https://llvm.org/bugs/attachment.cgi?id=16050&action=edit
Failing test case

I'm seeing an assertion failure with the attached testcase:

llc: ../include/llvm/CodeGen/SlotIndexes.h:124: llvm::IndexListEntry*
llvm::SlotIndex::listEntry() const: Assertion `isValid() && "Attempt to compare
reserved index."' failed.

To reproduce:

llc -mtriple=amdgcn--amdhsa -mcpu=fiji amdgpu-coalescer-assert.ll -o - 
-verify-machineinstrs

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