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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [postmisched] wrong code generated after post-mi scheduling"
href="https://bugs.llvm.org/show_bug.cgi?id=51711">51711</a>
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<th>Summary</th>
<td>[postmisched] wrong code generated after post-mi scheduling
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>wweiandrew@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>before post-ra scheduling:
...
renamable $w17 = ANDSWri renamable $w6, 15, implicit-def dead $nzcv
$w18 = SUBSWrs renamable $w13, renamable $w14, 0, implicit-def $nzcv,
implicit-def dead $nzcv
...
renamable $w11 = ANDSWri killed renamable $w2, 0, implicit-def $nzcv
renamable $w9 = CSINCWr killed renamable $w8, renamable $w8, 0, implicit killed
$nzcv
...
after post-ra scheduling:
...
$w18 = SUBSWrs renamable $w13, renamable $w14, 0, implicit-def $nzcv,
implicit-def dead $nzcv
...
renamable $w11 = ANDSWri killed renamable $w2, 0, implicit-def $nzcv
renamable $w17 = ANDSWri renamable $w6, 15, implicit-def dead $nzcv
renamable $w9 = CSINCWr killed renamable $w8, renamable $w8, 0, implicit killed
$nzcv
...
"renamable $w17 = ANDSWri renamable $w6, 15, implicit-def dead $nzcv" was wrong
scheduled, because "implicit-def dead $nzcv" in this inst will break the true
dependence between "renamable $w11 = ..." and "renamable $w9 = ..."</pre>
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</p>
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