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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Cannot canonicalize (x & 1) || (x & 2) well"
href="http://llvm.org/bugs/show_bug.cgi?id=17564">17564</a>
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<th>Summary</th>
<td>Cannot canonicalize (x & 1) || (x & 2) well
</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>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</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>david.majnemer@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>On clang-3.3, consider:
define i32 @foo(int)(i32 %x) #0 {
%1 = and i32 %x, 1
%2 = icmp eq i32 %1, 0
br i1 %2, label %3, label %6
; <label>:3 ; preds = %0
%4 = and i32 %x, 2
%5 = icmp ne i32 %4, 0
br label %6
; <label>:6 ; preds = %0, %3
%7 = phi i1 [ true, %0 ], [ %5, %3 ]
%8 = zext i1 %7 to i32
ret i32 %8
}
this should be canonicalized into:
define i32 @foo(int)(i32 %x) #0 {
%1 = and i32 %x, 3
ret i32 %1
}</pre>
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