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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang-cl support for MSVC overload of __builtin_assume_aligned"
href="https://bugs.llvm.org/show_bug.cgi?id=42263">42263</a>
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<th>Summary</th>
<td>Clang-cl support for MSVC overload of __builtin_assume_aligned
</td>
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<th>Product</th>
<td>new-bugs
</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>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>kile@microsoft.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22087" name="attach_22087" title="example">attachment 22087</a> <a href="attachment.cgi?id=22087&action=edit" title="example">[details]</a></span>
example
As part of the C++20 work for std::assume_aligned, MSVC has implemented an
intrinsic that has an already existing counterpart on clang, gcc, etc. The
declaration is almost identical to those except that it's constexpr. Function
declaration:
constexpr void* __builtin_assume_aligned(const void*, size_t, ... ) noexcept;
Clang/GCC delcaration:
void* __builtin_assume_aligned(const void*, size_t, ... ) noexcept;
Currently the MSVC intrinsic isn't accepted due to it's constexprness (or at
least on clang-cl it's not right now) but we'd like this to work on that front
end at some point.
Current error:
error: constexpr declaration of '__builtin_assume_aligned' follows
non-constexpr declaration
constexpr void* __builtin_assume_aligned(const void*, size_t, ... /* size_t
misalignmentOffset */) noexcept;
^
bug.cpp(2,17): note: previous declaration is here</pre>
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