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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ATOMIC_OP_NEEDS_MEMORY_BARRIER configure check shouldn't be false for ARM"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90302">90302</a>
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<th>Summary</th>
<td>ATOMIC_OP_NEEDS_MEMORY_BARRIER configure check shouldn't be false for ARM
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<th>Product</th>
<td>cairo
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>Other
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>general
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
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<th>Reporter</th>
<td>froydnj@gmail.com
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<th>QA Contact</th>
<td>cairo-bugs@cairographics.org
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<pre>ATOMIC_OP_NEEDS_MEMORY_BARRIER, set by configure:
<a href="http://cgit.freedesktop.org/cairo/tree/build/aclocal.cairo.m4#n203">http://cgit.freedesktop.org/cairo/tree/build/aclocal.cairo.m4#n203</a>
determines whether "atomic" loads need memory barriers prior to the load
itself. I assume this was put in for performance reasons.
>From the above link, I can see that it's defined to false for x86/x86-64, which
makes sense. What seems suspicious is that it's also defined to false for ARM,
which has much weaker memory ordering guarantees than x86 by default.</pre>
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