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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [Thumb2] Incorrect CPSR<kill> liveness for bundled instructions"
href="https://llvm.org/bugs/show_bug.cgi?id=26655">26655</a>
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<th>Summary</th>
<td>[Thumb2] Incorrect CPSR<kill> liveness for bundled instructions
</td>
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<th>Product</th>
<td>tools
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>llc
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>mgrang@codeaurora.org
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>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.</pre>
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</p>
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