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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - r299387 introduced regression in performance of generate code for test-suite/SingleSource/Benchmarks/Misc/matmul_f64_4x4.c"
href="https://bugs.llvm.org/show_bug.cgi?id=32558">32558</a>
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<th>Summary</th>
<td>r299387 introduced regression in performance of generate code for test-suite/SingleSource/Benchmarks/Misc/matmul_f64_4x4.c
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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
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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
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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>zvi.rackover@intel.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18242" name="attach_18242" title="Module for which generated code has regressed">attachment 18242</a> <a href="attachment.cgi?id=18242&action=edit" title="Module for which generated code has regressed">[details]</a></span>
Module for which generated code has regressed
The attached LLVM-IR module was compiled from the LLVM test-suite file
test-suite/SingleSource/Benchmarks/Misc/matmul_-f64_4x4.c, with the option
-march=skx.
The performance quality of the generated code for the function 'wrap_mul4' has
regressed.
By examining the difference in the generated codes it seems that movsd+vpermpd
sequences are being generated instead single vbroadcastsd instructions.
Note: the commit log in r299387 mentions that
"There are a couple of minor regressions this patch unearths due to some
missing MOVDDUP/BROADCAST folds that I will address in a future patch."</pre>
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