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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - constexpr can't handle vector types"
href="https://bugs.llvm.org/show_bug.cgi?id=42461">42461</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>constexpr can't handle vector types
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<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>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr>
<tr>
<th>Blocks</th>
<td>31446
</td>
</tr></table>
<p>
<div>
<pre>Godbolt: <a href="https://godbolt.org/z/l-RaB7">https://godbolt.org/z/l-RaB7</a>
We are unable to use __vector_size or ext_vector_type defined types in
constexpr functions.
typedef int __v4si __attribute__((__vector_size__(16)));
constexpr int sum_i32(__v4si x) {
return x[0] + x[1] + x[2] + x[3];
}
constexpr __v4si add_i32(__v4si x, __v4si y) {
return x + y;
}
clang -g0 -O3
<source>:3:18: error: constexpr function never produces a constant expression
[-Winvalid-constexpr]
constexpr __v4si add_i32(__v4si x, __v4si y) {
^
<source>:4:12: note: subexpression not valid in a constant expression
return x + y;
^
<source>:7:15: error: constexpr function never produces a constant expression
[-Winvalid-constexpr]
constexpr int sum_i32(__v4si x) {
^
<source>:8:10: note: subexpression not valid in a constant expression
return x[0] + x[1] + x[2] + x[3];</pre>
</div>
</p>
<div id="referenced">
<hr style="border: 1px dashed #969696">
<b>Referenced Bugs:</b>
<ul>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - [feature-request] make vector intrinsics constexpr"
href="https://bugs.llvm.org/show_bug.cgi?id=31446">Bug 31446</a>] [feature-request] make vector intrinsics constexpr
</li>
</ul>
</div>
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