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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 - ~(~X + Y) -> X - Y"
href="https://bugs.llvm.org/show_bug.cgi?id=47051">47051</a>
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<th>Summary</th>
<td>~(~X + Y) -> X - Y
</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>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Common Code Generator Code
</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>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>LLVM should implement simplification ~(~X + Y) -> X - Y.
int bad (int x, int y)
{
return ~(~x + y);
}
Clang:
bad(int, int): # @bad(int, int)
not edi
lea eax, [rdi + rsi]
not eax
ret
GCC:
bad(int, int):
mov eax, edi
sub eax, esi
ret</pre>
</div>
</p>
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