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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missed optimization for std::div"
href="https://bugs.llvm.org/show_bug.cgi?id=42818">42818</a>
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<th>Summary</th>
<td>Missed optimization for std::div
</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>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>std::div - Computes both the quotient and the remainder of the division of the
numerator x by the denominator y.
int d() {
std::div_t q = std::div(12, 6);
return q.rem;
}
Clang trunk -O3
d(): # @mxain()
push rax
mov edi, 12
mov esi, 6
call div
shr rax, 32
pop rcx
ret</pre>
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