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<body><span class="vcard"><a class="email" href="mailto:wenzel.jakob@epfl.ch" title="Wenzel Jakob <wenzel.jakob@epfl.ch>"> <span class="fn">Wenzel Jakob</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - AVX512: Support passing ZMM vectors via registers (via __regcall or other calling convention)"
href="https://llvm.org/bugs/show_bug.cgi?id=28963">bug 28963</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>REOPENED
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<td>RESOLVED
</td>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - AVX512: Support passing ZMM vectors via registers (via __regcall or other calling convention)"
href="https://llvm.org/bugs/show_bug.cgi?id=28963#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - AVX512: Support passing ZMM vectors via registers (via __regcall or other calling convention)"
href="https://llvm.org/bugs/show_bug.cgi?id=28963">bug 28963</a>
from <span class="vcard"><a class="email" href="mailto:wenzel.jakob@epfl.ch" title="Wenzel Jakob <wenzel.jakob@epfl.ch>"> <span class="fn">Wenzel Jakob</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=28963#c3">comment #3</a>)
<span class="quote">> > 1. GCC does this by default, even without specifying specific calling
> > conventions. (!). This is ideal from a performance perspective albeit
> > perhaps a bit unorthodox.
>
> This is a serious compatibility problem, it means that we aren't doing the
> right thing. Please file a bug showing clang performing a parameter access
> via an inappropriate register (while showing what GCC does).</span >
That's a good point -- thank you for clarifying. I've opened another ticket
about that (<a class="bz_bug_link
bz_status_NEW "
title="NEW --- - ABI incompatibilities between Clang and GCC (calling conventions for AVX512 vector arguments)"
href="show_bug.cgi?id=28975">Bug 28975</a>) and will close this ticket then.</pre>
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