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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - __GCC_ATOMIC_SHORT_LOCK_FREE defined incorrectly for WebAssembly"
href="https://bugs.llvm.org/show_bug.cgi?id=33146">33146</a>
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<th>Summary</th>
<td>__GCC_ATOMIC_SHORT_LOCK_FREE defined incorrectly for WebAssembly
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>other
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>dan433584@gmail.com
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<th>CC</th>
<td>dschuff@google.com, jgravelle@google.com, llvm-bugs@lists.llvm.org
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<pre>8-bit and 16-bit atomics in the proposed WebAssembly memory model are not
guaranteed to be lock-free, even though 32-bit atomics are.
clang currently defines __GCC_ATOMIC_SHORT_LOCK_FREE and others to be 2, which
is incorrect; with current WebAssembly shared memory proposal, they should be
1.
A patch to implement this in clang is here: <a href="https://reviews.llvm.org/D31516">https://reviews.llvm.org/D31516</a>
The WebAssembly memory model proposal is here:
<a href="https://github.com/WebAssembly/threads">https://github.com/WebAssembly/threads</a></pre>
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