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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang does not optimize alignment checks"
href="https://bugs.llvm.org/show_bug.cgi?id=50421">50421</a>
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<th>Summary</th>
<td>clang does not optimize alignment checks
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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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>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>gonzalo.gadeschi@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Example: <a href="https://godbolt.org/z/G8j6dbG6T">https://godbolt.org/z/G8j6dbG6T</a>
#include <cstdint>
bool copy(int* out, int* in) {
*out = *in;
return (std::uintptr_t)in % 4 == 0;
}
does not optimize the alignment check away:
copy(int*, int*): # @copy(int*, int*)
mov eax, dword ptr [rsi]
mov dword ptr [rdi], eax
test sil, 3
sete al
ret</pre>
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