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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Extend the expressivity of isCommutable"
href="http://llvm.org/bugs/show_bug.cgi?id=19693">19693</a>
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<th>Summary</th>
<td>Extend the expressivity of isCommutable
</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>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>TableGen
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>qcolombet@apple.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Currently when an instruction has commutable arguments, one can set the
isCommutable bit on the definition of the instruction.
By default the isCommutable flag implies that the first two register arguments
of the instruction are commutable.
To change that, one has to implement the related logic in
XXXXTarget::findCommutedOpIndices.
This is error prone and it would be nice to have this information in the td
file instead of having to write separate C++ code.
X86 has one such example with the vfmadd231XXX instruction.</pre>
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