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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - implement __builtin_assume_aligned()"
href="http://llvm.org/bugs/show_bug.cgi?id=16294">16294</a>
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<th>Summary</th>
<td>implement __builtin_assume_aligned()
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</td>
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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
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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>conradsand.arma@gmail.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Hello,
Thanks for your work on clang. It would be very useful to implement the
__builtin_assume_aligned() function, which allows the compiler to assume that
the returned pointer is aligned (to a user specified number of bytes). This can
help in automatic vectorisation, allowing the compiler to use aligned SSE2
instructions.
GCC 4.7+ has this:
<a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html">http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html</a>
The __builtin_assume_aligned() function is used to speed up software such as
the Armadillo C++ linear algebra library:
<a href="http://arma.sourceforge.net/">http://arma.sourceforge.net/</a></pre>
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