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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SystemZ] '0 == memcmp(...)' not optimized anymore"
href="https://bugs.llvm.org/show_bug.cgi?id=47420">47420</a>
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<th>Summary</th>
<td>[SystemZ] '0 == memcmp(...)' not optimized anymore
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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>URL</th>
<td>https://godbolt.org/z/q45ocv
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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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: SystemZ
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>slavomir.kucera@broadcom.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, uweigand@de.ibm.com
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<p>
<div>
<pre>Starting with LLVM 9, the following code
int test1(const char* l, const char* r) {
return memcmp(l,r,2) == 0;
}
is basically transformed into
int test1(const char* l, const char* r) {
return bcmp(l,r,2) == 0;
}
which is not optimized by the SystemZ backend anymore - an actual function call
is generated.
<a href="https://godbolt.org/z/q45ocv">https://godbolt.org/z/q45ocv</a></pre>
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