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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Hosts.cpp: calls xgetbv before detecting xsave support"
href="https://bugs.llvm.org/show_bug.cgi?id=35208">35208</a>
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<th>Summary</th>
<td>Hosts.cpp: calls xgetbv before detecting xsave support
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Support Libraries
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>gonzalobg88@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<pre>In Hosts.cpp, the following code:
bool HasAVXSave = ((ECX >> 27) & 1) && ((ECX >> 28) & 1) &&
!getX86XCR0(&EAX, &EDX) && ((EAX & 0x6) == 0x6);
indirectly calls xgetbv through getX86XCR0 without checking whether the CPU
supports XSAVE before doing so. XSAVE is detected a bit after in:
// Only enable XSAVE if OS has enabled support for saving YMM state.
Features["xsave"] = HasAVXSave && (ECX >> 26) & 1;</pre>
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