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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Incorrect codegen for enum with bool underlying type"
href="https://bugs.llvm.org/show_bug.cgi?id=47055">47055</a>
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<th>Summary</th>
<td>Incorrect codegen for enum with bool underlying type
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++11
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>aaron@aaronballman.com
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Consider the following code that appears to be valid C++11:
enum E : bool { Zero, One };
int f(int x) {
return (E)x;
}
Generates the following at -O0:
f(int): # @f(int)
push rbp
mov rbp, rsp
mov dword ptr [rbp - 4], edi
mov eax, dword ptr [rbp - 4]
and al, 1
movzx eax, al
pop rbp
ret
We are ANDing x with 0x1 rather than comparing it against zero as required by
[conv.bool] and [expr.static.cast]p10.</pre>
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</p>
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