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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [InstSimplify] Failure to drop check-for-zero after uadd_with_overflow"
href="https://bugs.llvm.org/show_bug.cgi?id=43246">43246</a>
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<th>Summary</th>
<td>[InstSimplify] Failure to drop check-for-zero after uadd_with_overflow
</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>
</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>
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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>
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<p>
<div>
<pre><a href="https://rise4fun.com/Alive/yFB">https://rise4fun.com/Alive/yFB</a>
Name: zz
Pre: C != 0
%1 = add i64 C, %offset
%2 = icmp ne i64 %1, 0
%3 = icmp uge i64 %1, C
%r = and i1 %2, %3
=>
%r = icmp uge i64 %1, C
This comes up in <a href="https://reviews.llvm.org/D67122">https://reviews.llvm.org/D67122</a>
for the code like
char* test(char& base, unsigned long offset) {
return &base + offset;
}</pre>
</div>
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