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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Document trap representations of _Bool"
href="https://bugs.llvm.org/show_bug.cgi?id=40192">40192</a>
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<th>Summary</th>
<td>Document trap representations of _Bool
</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>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Documentation
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>gonzalobg88@gmail.com
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>Compiling
unsigned int foo(unsigned int x, _Bool b) {
return x - (unsigned int)b;
}
only produces correct results if the value of `_Bool` is either `0` or `1`, see
<a href="https://gcc.godbolt.org/z/IqjQ">https://gcc.godbolt.org/z/IqjQ</a>-- :
foo: # @foo
mov eax, edi
sub eax, esi
ret
This probably means that all other representations of `_Bool` are trap
representations, but this does not appear to be documented anywhere.
>From my reading of the C standard, the role that padding bits play for `_Bool`
is unclear.</pre>
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</p>
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