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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [llvm-exegesis] Can't test any SSE/AVX instructions on pre-AVX hardware"
href="https://bugs.llvm.org/show_bug.cgi?id=38008">38008</a>
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<th>Summary</th>
<td>[llvm-exegesis] Can't test any SSE/AVX instructions on pre-AVX hardware
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<th>Product</th>
<td>new-bugs
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
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<th>CC</th>
<td>clement.courbet@gmail.com, craig.topper@gmail.com, gchatelet@google.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>It looks like llvm-exegesis is always using VEX encoded instructions in the
setRegToConstant function:
if (llvm::X86::VR128XRegClass.contains(Reg)) {
return setVectorRegToConstant(Reg, 16, llvm::X86::VMOVDQUrm);
For machines without AVX this will fail - it needs to be llvm::X86::MOVDQUrm on
those targets.
If we ever go as far as testing machines without SSE2 (PentiumIII etc) then we
would need to use the SSE1 llvm::X86::MOVUPSrm instead.
You might also want to check the reg classes as IIRC VR128X/VR256X are only
supposed to be used for AVX512 capable targets.</pre>
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