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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang should support gcc's __builtin_alloca_with_align()"
href="https://llvm.org/bugs/show_bug.cgi?id=30658">30658</a>
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<th>Summary</th>
<td>Clang should support gcc's __builtin_alloca_with_align()
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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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
</td>
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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>jobstz@yahoo.de
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Clang already supports __builtin_alloca() but not with an extra alignment
specifier.
IMHO this function without alignment guarantees is almost useless, because e.g
it is inherently unsafe to attempt to stuff a c++ type into the allocated
memory.
Trying to implement this function outside of the compiler stack is also not a
good idea, because it is by nature very platform dependent and any efficient
implementation would have to use inline assembly.
Still the function is abstract enough to be supported on most machines (just as
__buitin_alloca()) so that it makes sense to insert into the compiler.</pre>
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</p>
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