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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertion failed: !(isAtomic() && getAlignment() == 0) && "Alignment required for atomic load""
href="https://bugs.llvm.org/show_bug.cgi?id=45010">45010</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Assertion failed: !(isAtomic() && getAlignment() == 0) && "Alignment required for atomic load"
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>10.0
</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>release blocker
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>gchatelet@google.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>alexandre.ganea@ubisoft.com
</td>
</tr>
<tr>
<th>CC</th>
<td>hans@chromium.org, htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr>
<tr>
<th>Blocks</th>
<td>44555
</td>
</tr></table>
<p>
<div>
<pre>When compiling Clang with assertions enabled, I'm seeing the assert I've
mentioned here: <a href="https://reviews.llvm.org/D71547#1824272">https://reviews.llvm.org/D71547#1824272</a>
Repro:
// a.cpp
// Build with: clang-cl a.cpp /c /O1
#include <vector>
struct SP {
void WeakAddRef();
void WeakRelease();
};
template <typename T> struct PtrBase {
T *volatile P;
~PtrBase() {
if (R)
R->WeakRelease();
}
PtrBase(const PtrBase &O) : R(O.R) {
if (R)
R->WeakAddRef();
}
SP *R;
bool IsValid() const { return P != nullptr; }
};
struct alignas(16) VectorSIMD4f {
float V;
};
unsigned __int64 countAF() {
class AF {
VectorSIMD4f B;
};
struct PD {
PtrBase<AF> P;
};
std::vector<PD> AFs;
unsigned __int64 C = 0;
for (auto A : AFs) {
if (A.P.IsValid())
++C;
}
return C;
}</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_CONFIRMED "
title="CONFIRMED - [meta] 10.0.0 Release Blockers"
href="https://bugs.llvm.org/show_bug.cgi?id=44555">Bug 44555</a>] [meta] 10.0.0 Release Blockers
</li>
</ul>
</div>
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