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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Review current scheduler classes to minimise need for InstRW overrides"
href="https://bugs.llvm.org/show_bug.cgi?id=37131">37131</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[X86] Review current scheduler classes to minimise need for InstRW overrides
</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>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<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>andrea.dibiagio@gmail.com, clement.courbet@gmail.com, craig.topper@gmail.com, llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
</td>
</tr>
<tr>
<th>Depends on</th>
<td>32857, 35608, 36726, 36911, 36924, 36930, 36931
</td>
</tr>
<tr>
<th>Blocks</th>
<td>32325, 35548
</td>
</tr></table>
<p>
<div>
<pre>Many models are making very poor use of the default scheduler classes, with
many using InstrRW, resulting in cases such as:
1 - A default class isn't used at all, and all its instructions use InstrRW -
we should be able to at least move some instructions to the default, or split
the class to match as many instructions as possible across all targets.
2 - An instruction uses InstrRW but in fact matches the default class values
(<a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Warn if a scheduling instrs/instregex entry doesn't alter the default schedule"
href="show_bug.cgi?id=35548">Bug #35548</a>).
3 - Some targets just don't need to use some scheduler classes at all (Bug
#35608).
This patch is to track possible splits to the classes that would help us move
away from unnecessary InstRW usage and make the scheduler models more easily
maintainable.</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 - [META][X86] Improve implementation and use of X86 scheduler models"
href="https://bugs.llvm.org/show_bug.cgi?id=32325">Bug 32325</a>] [META][X86] Improve implementation and use of X86 scheduler models
</li>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - Add scheduler classes for vector masked load/store operations"
href="https://bugs.llvm.org/show_bug.cgi?id=32857">Bug 32857</a>] Add scheduler classes for vector masked load/store operations
</li>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Warn if a scheduling instrs/instregex entry doesn't alter the default schedule"
href="https://bugs.llvm.org/show_bug.cgi?id=35548">Bug 35548</a>] [X86] Warn if a scheduling instrs/instregex entry doesn't alter the default schedule
</li>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Remove Schedule classes from models that don't use them"
href="https://bugs.llvm.org/show_bug.cgi?id=35608">Bug 35608</a>] [X86] Remove Schedule classes from models that don't use them
</li>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86][SSE] Split gpr/vector WriteMove, WriteLoad, WriteStore scheduler classes"
href="https://bugs.llvm.org/show_bug.cgi?id=36726">Bug 36726</a>] [X86][SSE] Split gpr/vector WriteMove, WriteLoad, WriteStore scheduler classes
</li>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Add scheduler classes that account for GPR<->XMM transfers"
href="https://bugs.llvm.org/show_bug.cgi?id=36911">Bug 36911</a>] [X86] Add scheduler classes that account for GPR<->XMM transfers
</li>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Split vector schedule classes by vector width only as necessary"
href="https://bugs.llvm.org/show_bug.cgi?id=36924">Bug 36924</a>] [X86] Split vector schedule classes by vector width only as necessary
</li>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Split WriteIDiv into 8/16/32/64 implementations"
href="https://bugs.llvm.org/show_bug.cgi?id=36930">Bug 36930</a>] [X86] Split WriteIDiv into 8/16/32/64 implementations
</li>
<li>
[<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">Bug 36931</a>] [X86] Split WriteIMul into 8/16/32/64 implementations
</li>
</ul>
</div>
<br>
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