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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Combining comparisons to add and compare"
href="https://bugs.llvm.org/show_bug.cgi?id=42691">42691</a>
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<th>Summary</th>
<td>Combining comparisons to add and compare
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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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
</td>
</tr>
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<th>Reporter</th>
<td>nikita.ppv@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>define i1 @test(i32 %x) {
%c1 = icmp slt i32 %x, 0
%c2 = icmp eq i32 %x, 2147483647
%c = or i1 %c1, %c2
ret i1 %c
}
could be combined to
define i1 @test(i32 %x) {
%y = add i32 %x, 1
%c = icmp slt i32 %y, 1
ret i1 %c
}
which is especially profitable if the add is already being computed for other
reasons.
<a href="https://rise4fun.com/Alive/GFm">https://rise4fun.com/Alive/GFm</a></pre>
</div>
</p>
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