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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Large numbers of (e.g., 27) redundant vxorpd generated on loop entry"
href="https://bugs.llvm.org/show_bug.cgi?id=46118">46118</a>
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<th>Summary</th>
<td>Large numbers of (e.g., 27) redundant vxorpd generated on loop entry
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<th>Product</th>
<td>new-bugs
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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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>elrodc@gmail.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<p>
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<pre>The generated code does the following:
vxorp 27 registers
checks if the loop iterates at least once. If it doesn't, jump.
vxorp those exact same 27 registers
enters loop.
The second set of 27 vxorpd is unnecessary, those registers are all already 0.
Godbolt:
<a href="https://godbolt.org/z/nsc7kc">https://godbolt.org/z/nsc7kc</a></pre>
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