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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - X86FastISel::X86FastEmitLoad - unsafe NT vector load"
href="https://bugs.llvm.org/show_bug.cgi?id=41837">41837</a>
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<th>Summary</th>
<td>X86FastISel::X86FastEmitLoad - unsafe NT vector load
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</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<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: X86
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</td>
</tr>
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<pre>For V4f32/v2f64 we only attempt NT loads when SSE41 is enabled:
case MVT::v4f32:
if (IsNonTemporal && Alignment >= 16 && HasSSE41)
Opc = HasVLX ? X86::VMOVNTDQAZ128rm :
HasAVX ? X86::VMOVNTDQArm : X86::MOVNTDQArm;
else if (Alignment >= 16)
Opc = HasVLX ? X86::VMOVAPSZ128rm :
HasAVX ? X86::VMOVAPSrm : X86::MOVAPSrm;
else
Opc = HasVLX ? X86::VMOVUPSZ128rm :
HasAVX ? X86::VMOVUPSrm : X86::MOVUPSrm;
RC = HasVLX ? &X86::VR128XRegClass : &X86::VR128RegClass;
break;
But this limit appears to be missing for 128-bit integer vectors:
case MVT::v4i32:
case MVT::v2i64:
case MVT::v8i16:
case MVT::v16i8:
if (IsNonTemporal && Alignment >= 16)
Opc = HasVLX ? X86::VMOVNTDQAZ128rm :
HasAVX ? X86::VMOVNTDQArm : X86::MOVNTDQArm;
else if (Alignment >= 16)
Opc = HasVLX ? X86::VMOVDQA64Z128rm :
HasAVX ? X86::VMOVDQArm : X86::MOVDQArm;
else
Opc = HasVLX ? X86::VMOVDQU64Z128rm :
HasAVX ? X86::VMOVDQUrm : X86::MOVDQUrm;
RC = HasVLX ? &X86::VR128XRegClass : &X86::VR128RegClass;
break;</pre>
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