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: unassignedb...@nondot.org
Reporter: mgr...@codeaurora.org
CC: llvm-bugs@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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