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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Suspected bug on nested union type-punning"
href="https://bugs.llvm.org/show_bug.cgi?id=36050">36050</a>
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</tr>
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<th>Summary</th>
<td>Suspected bug on nested union type-punning
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</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>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chen.pang.he@jdh8.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>#define reinterpret(T, x) ((union { __typeof__(x) from; T to; }){ x }.to)
float fail(float x)
{
// error: initializer element is not a compile-time constant
return reinterpret(float, reinterpret(int, x) | 0x7FC00000);
}
float pass(float x)
{
unsigned i = reinterpret(int, x);
return reinterpret(int, i | 0x7FC00000);
}</pre>
</div>
</p>
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