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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 pairs of adjacent operations that can be macro fused."
href="https://bugs.llvm.org/show_bug.cgi?id=36670">36670</a>
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<th>Summary</th>
<td>[llvm-mca][x86] Teach how to identify pairs of adjacent operations that can be macro fused.
</td>
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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>
<div>
<pre>On modern x86 processors, a 'cmp/test' followed by a conditional jump can be
micro fused. The advantage is that the fused pair only consumes a single slot
in the dispatch group.
The tool should be extended to address macro-fusion. Ideally, LLVM should
expose this information (possibly through the MC subtarget interface; this is
just an idea...).</pre>
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