[llvm-bugs] [Bug 26655] New: [Thumb2] Incorrect CPSR<kill> liveness for bundled instructions

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26655

            Bug ID: 26655
           Summary: [Thumb2] Incorrect CPSR<kill> liveness for bundled
                    instructions
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: llc
          Assignee: unassignedbugs at nondot.org
          Reporter: mgrang at codeaurora.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

For Thumb2 instructions which have the CPSR<kill marker> and which are part of
an instruction bundle, the CPSR liveness is always false.

But the function UpdateCPSRUse does not recognize this and expects the liveness
to be true and hence asserts:

clang-3.8:
/prj/llvm-arm/home/nightly/src/qc-38/llvm/lib/Target/ARM/Thumb2SizeReduction.cpp:1381:
bool UpdateCPSRUse(llvm::MachineInstr &, bool): Assertion `LiveCPSR && "CPSR
liveness tracking is wrong!"' failed.

We need to fix this by skipping the assert for such instructions.

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