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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - PPC64: atomic store results in bus error if type i8 is used"
href="http://llvm.org/bugs/show_bug.cgi?id=15630">15630</a>
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<th>Summary</th>
<td>PPC64: atomic store results in bus error if type i8 is used
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: PowerPC
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>kai@redstar.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10259" name="attach_10259" title="IR file demonstrating the problem.">attachment 10259</a> <a href="attachment.cgi?id=10259&action=edit" title="IR file demonstrating the problem.">[details]</a></span>
IR file demonstrating the problem.
The attached atomicbug_ubyte.ll results in a bus error if compiled with these
steps:
llc -O0 -filetype=obj atomicbug_ubyte.ll
gcc -m64 atomicbug_ubyte.o
./a.out
The code was produced by LDC from the following source and hand-edited to
reduce size:
module atomicbug;
import core.atomic;
void main()
{
shared ubyte val = 0;
atomicStore!(MemoryOrder.seq,ubyte,ubyte)(val, cast(ubyte)1);
}
There is no bus error if I use type i64 (ulong) instead. Maybe an alignment
problem?
The LLVM language reference tells me: "An alignment of 1 is always safe."
(which is used in this file).</pre>
</div>
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