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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [LV] Loop vectorizer crashes trying to version for unit stride at -Os/-Oz"
href="https://bugs.llvm.org/show_bug.cgi?id=46228">46228</a>
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<th>Summary</th>
<td>[LV] Loop vectorizer crashes trying to version for unit stride at -Os/-Oz
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Loop Optimizer
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>ayal.zaks@intel.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23585" name="attach_23585" title="Attached ll raises an assert compiled with "opt -loop-vectorize -S"">attachment 23585</a> <a href="attachment.cgi?id=23585&action=edit" title="Attached ll raises an assert compiled with "opt -loop-vectorize -S"">[details]</a></span>
Attached ll raises an assert compiled with "opt -loop-vectorize -S"
Loop access analysis may generate runtime checks to version a loop for unit
strides, under -Os/-Oz, when loop vectorization is enabled. This later raises
the loop vectorizer's assert: "Cannot SCEV check stride or overflow when
optimizing for size".
Reproduced by compiling the attached with "opt -loop-vectorize -S".</pre>
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