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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Regression(r304267): clang miscompiles chrome on arm32"
href="https://bugs.llvm.org/show_bug.cgi?id=34056">34056</a>
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<th>Summary</th>
<td>Regression(r304267): clang miscompiles chrome on arm32
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: ARM
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>nicolasweber@gmx.de
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
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<pre>Chrome and all of its test binaries fail when built in a debug build on arm32.
We bisected this down to r304267.
<a href="https://bugs.chromium.org/p/chromium/issues/detail?id=742563#c15">https://bugs.chromium.org/p/chromium/issues/detail?id=742563#c15</a> has some
analysis on what's wrong. The file mentioned there is
<a href="https://cs.chromium.org/chromium/src/base/threading/thread_local_storage.cc?q=base/threading/thread_local_storage.cc&sq=package:chromium&dr&l=320">https://cs.chromium.org/chromium/src/base/threading/thread_local_storage.cc?q=base/threading/thread_local_storage.cc&sq=package:chromium&dr&l=320</a>
TlsVectorEntry* tls_data = static_cast<TlsVectorEntry*>(
PlatformThreadLocalStorage::GetTLSValue(
base::subtle::NoBarrier_Load(&g_native_tls_key)));
if (!tls_data)
tls_data = ConstructTlsVector();
DCHECK_NE(slot_, kInvalidSlotValue);
DCHECK_LT(slot_, kThreadLocalStorageSize);
tls_data[slot_].data = value;
tls_data[slot_].version = version_;
"First ThreadLocalStorage::StaticSlot::Set(void* value) gets called, then when
ThreadLocalStorage::StaticSlot::Get() is called later on, tls_data is null, and
ConstructTlsVector() is called again." (this is the bug)</pre>
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