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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Add a unit test for frame index expansion"
href="https://bugs.llvm.org/show_bug.cgi?id=39554">39554</a>
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<th>Summary</th>
<td>Add a unit test for frame index expansion
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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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>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: AVR
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>me@dylanmckay.io
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>In avr-rust <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - casting a string constant to void crashes llvm-gcc"
href="show_bug.cgi?id=112">bug #112</a>, we encountered a backend bug caused by invalid expansion
of a FRMIDX instruction into a MOVWRdRr instruction. The backend would leave an
extraneous operand from the original FRMIDX that was not consistent with the
definition of MOVWRdRr.
This would trigger an assertion:
Assertion failed: ((isImpReg || Op.isRegMask() || MCID->isVariadic() ||
OpNo < MCID->getNumOperands() || isMetaDataOp) &&
"Trying to add an operand to a machine instr that is
already done!"),
function addOperand, file llvm/lib/CodeGen/MachineInstr.cpp
More informatiob about that bug can be found at:
<a href="https://github.com/avr-rust/rust/issues/112">https://github.com/avr-rust/rust/issues/112</a>
We should write unit tests that cover the expansion of FRMIDX nodes into
MOVWRdRr instructions.</pre>
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