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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [llvm-mca][x86] Teach how to identify optimizable register-register moves and zero-idioms."
href="https://bugs.llvm.org/show_bug.cgi?id=36671">36671</a>
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<th>Summary</th>
<td>[llvm-mca][x86] Teach how to identify optimizable register-register moves and zero-idioms.
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<th>Product</th>
<td>new-bugs
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>andrea.dibiagio@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
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<pre>This is currently marked as x86. However, it may apply to other targets other
than x86.
Most modern Intel/AMD processors know how to eliminate register-register moves
and zero idioms at register renaming stage. The tool currently doesn't know
about these patterns, and this may negatively impact the performance analysis.
We want to expose this information to llvm-mca. Ideally, the tool should have a
View to generate performance counters for the:
- number of register moves eliminated
- number of zero idioms eliminated</pre>
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