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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Implement MMX intrinsics with SSE equivalents"
href="https://bugs.llvm.org/show_bug.cgi?id=42320">42320</a>
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<th>Summary</th>
<td>[X86] Implement MMX intrinsics with SSE equivalents
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<pre>Similar to what's been proposed recently for gcc, we should investigate
promoting MMX intrinsics to SSE equivalents:
<a href="https://gcc.gnu.org/ml/gcc-patches/2019-02/msg00061.html">https://gcc.gnu.org/ml/gcc-patches/2019-02/msg00061.html</a>
This probably would be best handled in CGBuiltin.cpp - replacing the MMX
builtins with SSE equivalents, although some can probably done in headers as
well behind a suitable define.
NOTE: This will cause a high number of subvector insertions/extractions, we
might need some mechanism to reduce this even without optimizations.</pre>
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