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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 - Missed arithmetic fold"
href="https://bugs.llvm.org/show_bug.cgi?id=51783">51783</a>
</td>
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<tr>
<th>Summary</th>
<td>Missed arithmetic fold
</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>Windows NT
</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>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>llvm@rifkin.dev
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>LLVM optimizes bar into tgt here but not foo.
<a href="https://godbolt.org/z/jdeT7jbjd">https://godbolt.org/z/jdeT7jbjd</a>
int foo(int a, int b) {
return b * (1 + a / b) - a;
}
int bar(int a, int b) {
return b * (a / b) + b - a;
}
int tgt(int a, int b) {
return b - a % b;
}
<a href="https://alive2.llvm.org/ce/z/axgBxW">https://alive2.llvm.org/ce/z/axgBxW</a>
GCC appears to miss this too.</pre>
</div>
</p>
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