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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - AMDGPU backend doesn't support mempcpy builtin"
href="https://bugs.llvm.org/show_bug.cgi?id=43180">43180</a>
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<th>Summary</th>
<td>AMDGPU backend doesn't support mempcpy builtin
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: AMDGPU
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>gabravier@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22455" name="attach_22455" title="7z archive containing the attachments">attachment 22455</a> <a href="attachment.cgi?id=22455&action=edit" title="7z archive containing the attachments">[details]</a></span>
7z archive containing the attachments
Very weirdly, it would seem that __builtin_mempcpy is not supported on amdgcn,
when __builtin_memcpy is.
When trying to compile a simple code file simply containing a wrapper function
calling these two functions (with -target amdgcn -mcpu=gfx909 (gfx909 so that
loads and stores work)), compiling a memcpy wrapper works, but compiling a
mempcpy wrapper crashes with "fatal error: error in backend: unsupported
libcall legalization"
I attached a 7z archive containing relevant files.
BTW was just trying to see the code generation for these builtins on multiple
platforms
Files in 7z archive :
- builtinMemcpy.c : code file containing a wrapper around __builtin_memcpy,
compiled with "clang -c builtinMemcpy.c -target amdgcn -mcpu=gfx909 -S"
- builtinMemcpy.s : result of the compilation of builtinMemcpy.c
- builtinMempcpy.c : code file containing a wrapper around __builtin_mempcpy
- builtinMempcpyPreprocessed.c : Preprocessed version of builtinMempcpy
provided by clang after crash
- builtinMempcpyRunScript.sh : Run script for builtinMempcpy provided by clang
after crash</pre>
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