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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 - De morgan laws: fold not into other xor"
href="https://bugs.llvm.org/show_bug.cgi?id=38446">38446</a>
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<th>Summary</th>
<td>De morgan laws: fold not into other xor
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<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>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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>lebedev.ri@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre><a href="https://rise4fun.com/Alive/8iv">https://rise4fun.com/Alive/8iv</a>
Name: fold xor
%old0 = icmp slt i32 %x, 0
%old1 = icmp slt i8 %y, 0
%old2 = xor i1 %old0, %old1
%r = xor i1 %old2, true
=>
%new0 = icmp slt i32 %x, 0
%new1 = icmp sge i8 %y, 0
%r = xor i1 %new0, %new1
Name: fold xor, alternative
%old0 = icmp slt i32 %x, 0
%old1 = icmp slt i8 %y, 0
%old2 = xor i1 %old0, %old1
%r = xor i1 %old2, true
=>
%new0 = icmp sge i32 %x, 0
%new1 = icmp slt i8 %y, 0
%r = xor i1 %new0, %new1
<a href="https://godbolt.org/g/Jn8ZKQ">https://godbolt.org/g/Jn8ZKQ</a>
We'll be getting a lot of these from implicit conversion sanitizer.</pre>
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