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<body><span class="vcard"><a class="email" href="mailto:james.molloy@arm.com" title="James Molloy <james.molloy@arm.com>"> <span class="fn">James Molloy</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Crash Using Clang on Android"
href="http://llvm.org/bugs/show_bug.cgi?id=19451">bug 19451</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<td style="text-align:right;">CC</td>
<td>
</td>
<td>james.molloy@arm.com
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Crash Using Clang on Android"
href="http://llvm.org/bugs/show_bug.cgi?id=19451#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Crash Using Clang on Android"
href="http://llvm.org/bugs/show_bug.cgi?id=19451">bug 19451</a>
from <span class="vcard"><a class="email" href="mailto:james.molloy@arm.com" title="James Molloy <james.molloy@arm.com>"> <span class="fn">James Molloy</span></a>
</span></b>
<pre>Hi,
I have reproduced the failure locally, but this is not a compiler bug.
The testcase creates a structure "foo" and uses it in a std::vector. "foo" has
an alignment constraint due to it containing a float32x4_t member of 16 bytes.
The compiler honours this in all code it generates. The underlying allocator
used by std::vector just calls operator new (_Znwj), and uses the memory
returned. operator new calls malloc, and malloc returns memory aligned to 8
bytes.
Memory corruption follows due to NEON instructions with :128 alignment hints
being used on unaligned addresses.
A similar question is asked at StackOverflow here:
<a href="http://stackoverflow.com/questions/12942548/making-stdvector-allocate-aligned-memory">http://stackoverflow.com/questions/12942548/making-stdvector-allocate-aligned-memory</a>
.
I'll resolve this as "not a bug".
Cheers,
James</pre>
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