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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Slow matrix vector product"
href="https://bugs.llvm.org/show_bug.cgi?id=43504">43504</a>
</td>
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<tr>
<th>Summary</th>
<td>Slow matrix vector product
</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>Linux
</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>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
</td>
</tr></table>
<p>
<div>
<pre><a href="https://gitlab.com/chriscox/CppPerformanceBenchmarks/blob/master/matrix_vector_product.cpp">https://gitlab.com/chriscox/CppPerformanceBenchmarks/blob/master/matrix_vector_product.cpp</a>
clang++-10 -Ofast matrix_vector_product.cpp -o mm
time ./mm 500
Total absolute time for int32_t matrix vector product: 2.63 sec (2.28 sec with
-march=haswell)
Total absolute time for float matrix vector product: 2.43 sec (2.61 sec with
-march=haswell)
Total absolute time for double matrix vector product: 1.77 sec (1.55 sec with
-march=haswell)
g++-10
Total absolute time for int32_t matrix vector product: 2.40 sec (1.68 sec with
-march=haswell)
Total absolute time for float matrix vector product: 1.75 sec (2.05 sec with
-march=haswell)
Total absolute time for double matrix vector product: 1.28 sec (1.49 sec with
-march=haswell)
icc-19
Total absolute time for int32_t matrix vector product: 2.49 sec (1.86 sec with
-march=haswell)
Total absolute time for float matrix vector product: 1.96 sec (1.86 sec with
-march=haswell)
Total absolute time for double matrix vector product: 1.29 sec (1.42 sec with
-march=haswell)</pre>
</div>
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