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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 peephole: xor-inc-add to xor-sub"
href="https://bugs.llvm.org/show_bug.cgi?id=45647">45647</a>
</td>
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<th>Summary</th>
<td>Missed peephole: xor-inc-add to xor-sub
</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>
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<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>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>lebedev.ri@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>define i8 @square(i8 %x, i8 %y) {
%t0 = xor i8 %x, -43
%t1 = add i8 %t0, 1
%r = add i8 %t1, %y
ret i8 %r
}
<a href="https://godbolt.org/z/EpjvTY">https://godbolt.org/z/EpjvTY</a>
----------------------------------------
Name: zz
%t0 = xor i8 %x, -43
%t1 = add i8 %t0, 1
%r = add i8 %t1, %y
ret i8 %r
=>
%n0 = xor i8 %x, 42
%r = sub i8 %y, %n0
ret i8 %r
%t0 = xor i8 %x, -43
%t1 = add i8 %t0, 1
Done: 1
Transformation seems to be correct!</pre>
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</p>
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