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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - m[ft]ppr instruction aliases not implemented"
href="https://bugs.llvm.org/show_bug.cgi?id=44264">44264</a>
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<th>Summary</th>
<td>m[ft]ppr instruction aliases not implemented
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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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
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: PowerPC
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>colin.samples@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, nemanja.i.ibm@gmail.com
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22924" name="attach_22924" title="patch to implement aliases">attachment 22924</a> <a href="attachment.cgi?id=22924&action=edit" title="patch to implement aliases">[details]</a></span>
patch to implement aliases
The mfppr and mtppr instruction aliases are not implemented in LLVM, but they
are in GCC and xlC. m[ft]ppr32 and quite a number of other m[tf]spr aliases are
also not implemented in LLVM.
I stumbled across this when trying to use the `_mm_pause` function
`clang/lib/Headers/ppc_wrappers/xmmintrin.h`, which uses these instructions in
its implementation.
The attached patch adds the instructions. AFAICT, the PPR was introduced in
POWER6, so this patch checks for that, although it seems like a bit much just
to implement an instruction alias.
Another option would be to just change the implementation in `xmmintrin.h` to
use `mfspr Rx,896`. Thoughts?</pre>
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