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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [C++4OpenCL] reinterpret_cast from T to T not allowed in some cases"
href="https://bugs.llvm.org/show_bug.cgi?id=49221">49221</a>
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<th>Summary</th>
<td>[C++4OpenCL] reinterpret_cast from T to T not allowed in some cases
</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
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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>OpenCL
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>marco.antognini@arm.com
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<th>CC</th>
<td>anastasia.stulova@arm.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>When casting T to T using reinterpret_cast is often not allowed. This might be
on purpose sometimes, but there are cases when I believe it should be
supported. For example:
kernel void foo() {
int x;
auto y = reinterpret_cast<decltype(x)>(x);
// error: reinterpret_cast from 'int' to 'decltype(x)' (aka '__private int')
is not allowed
}
kernel void goo() {
reserve_id_t x;
auto y = reinterpret_cast<reserve_id_t>(x);
// error: reinterpret_cast from 'reserve_id_t' to 'reserve_id_t' is not
allowed
}
<a href="https://godbolt.org/z/e7zqTG">https://godbolt.org/z/e7zqTG</a>
While this is allowed:
kernel void foo() {
int x;
auto y = (decltype(x))(x);
}
kernel void goo() {
reserve_id_t x;
auto y = (reserve_id_t)(x);
}
<a href="https://godbolt.org/z/s7x5zd">https://godbolt.org/z/s7x5zd</a></pre>
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