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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Optimize strlen(foo) > x to strnlen(foo, x+1) > x"
href="https://bugs.llvm.org/show_bug.cgi?id=49596">49596</a>
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<th>Summary</th>
<td>Optimize strlen(foo) > x to strnlen(foo, x+1) > x
</td>
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<th>Product</th>
<td>libraries
</td>
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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
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Transformation Utilities
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>gbs@canishe.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<pre>A lot of code has comparisons of the form:
strlen(foo) > x
This is inefficient, because always we read every byte of the string, even
after we already know it's longer than x. This could be optimized to:
strnlen(foo, x + 1) > x
But Clang doesn't do this. (Neither does GCC.) I'd like to take a shot at
implementing this, but I wanted to make sure I'm not missing some obvious
reason it wouldn't work.</pre>
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