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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - AVX512: Invalid operand for vcvttss2siq instruction"
href="https://llvm.org/bugs/show_bug.cgi?id=28810">28810</a>
</td>
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<tr>
<th>Summary</th>
<td>AVX512: Invalid operand for vcvttss2siq instruction
</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>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>wenzel.jakob@epfl.ch
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</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=16859" name="attach_16859" title="Problematic assembly file">attachment 16859</a> <a href="attachment.cgi?id=16859&action=edit" title="Problematic assembly file">[details]</a></span>
Problematic assembly file
The LLVM assembler (trunk) is unable to compile the attached assembly file
generarated by GCC on MacOS X.
clang++-4 test.s -o test -mavx512f
test.s:555:14: error: invalid operand for instruction
vcvttss2siq %xmm18, %rax
^~~~~~
test.s:559:14: error: invalid operand for instruction
vcvttss2siq %xmm17, %rax
^~~~~~
test.s:561:14: error: invalid operand for instruction
vcvttss2siq %xmm16, %rax
^~~~~~
I see two possibilities:
1. The vcvttss2siq instrunction does not exist for new-style xmm register
arguments, and GCC should not have generated it
2. It is a valid instruction, and it's the Clang assembler's fault for not
recognizing it.
I am not familiar enough with the AVX512F assembly and will create a ticket in
both the GCC and LLVM bugtracker so that this problem can be addressed. The GCC
ticket is here: <a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72773">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72773</a></pre>
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