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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Split WriteIMul into 8/16/32/64 implementations"
href="https://bugs.llvm.org/show_bug.cgi?id=36931">36931</a>
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<th>Summary</th>
<td>[X86] Split WriteIMul into 8/16/32/64 implementations
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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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>
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<th>Component</th>
<td>Backend: X86
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>a.bataev@hotmail.com, andrea.dibiagio@gmail.com, clement.courbet@gmail.com, craig.topper@gmail.com, llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
</td>
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<th>Blocks</th>
<td>36550, 36908
</td>
</tr></table>
<p>
<div>
<pre>MUL64 definitely needs its own scheduler class, possibly the others as well.
Multiply by constant (IMUL32rmi etc.) may need splitting off as well.
Note: Integer multiplies seem to be a common issue in vectorization regressions
(incorrectly comparing scalar/vector integer multiply costs), so all need to be
accurate for [<a class="bz_bug_link
bz_status_NEW "
title="NEW - Derive TTI instruction costs from scheduling models"
href="show_bug.cgi?id=36550">Bug #36550</a>] to work well.</pre>
</div>
</p>
<div id="referenced">
<hr style="border: 1px dashed #969696">
<b>Referenced Bugs:</b>
<ul>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - Derive TTI instruction costs from scheduling models"
href="https://bugs.llvm.org/show_bug.cgi?id=36550">Bug 36550</a>] Derive TTI instruction costs from scheduling models
</li>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - [meta][x86] Improve scheduler classes instruction coverage"
href="https://bugs.llvm.org/show_bug.cgi?id=36908">Bug 36908</a>] [meta][x86] Improve scheduler classes instruction coverage
</li>
</ul>
</div>
<br>
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