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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missed 'compress' codegen opportunity"
href="https://bugs.llvm.org/show_bug.cgi?id=42865">42865</a>
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<th>Summary</th>
<td>Missed 'compress' codegen opportunity
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
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<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
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<p>
<div>
<pre>int floatcompress(float* __restrict__ in, float* __restrict__ out, int N,
float T) {
int n = 0;
for (int i = 0; i < N; ++i) {
if (in[i] > T) out[n++] = in[i];
}
return n;
}
int intcompress(int* __restrict__ in, int* __restrict__ out, int N,
int T) {
int n = 0;
for (int i = 0; i < N; ++i) {
if (in[i] > T) out[n++] = in[i];
}
return n;
}
-Ofast -march=icelake-server
ICC uses 'vcompressps' / 'vpcompressd', Clang's codegen should be improved to
use them too..
Current codegen: <a href="https://godbolt.org/z/eS733l">https://godbolt.org/z/eS733l</a></pre>
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</p>
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