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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [loop vectorizer] Single extra copy of for loop breaks vectorization of the previous 4 copies."
href="https://bugs.llvm.org/show_bug.cgi?id=43161">43161</a>
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<th>Summary</th>
<td>[loop vectorizer] Single extra copy of for loop breaks vectorization of the previous 4 copies.
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>9.0
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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>normal
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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>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>manolismih@windowslive.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<pre>Created <span class=""><a href="attachment.cgi?id=22446" name="attach_22446" title="Code posted on godbolt">attachment 22446</a> <a href="attachment.cgi?id=22446&action=edit" title="Code posted on godbolt">[details]</a></span>
Code posted on godbolt
Hello, could you please have a look at this code posted on godbolt.org:
<a href="https://godbolt.org/z/O-O-Q7">https://godbolt.org/z/O-O-Q7</a>
(code also attached in case godbolt link breaks)
The problem is that inside the compute function, only the first loop vectorizes
while the rest copies of it don't. But if I remove any of the for loops, then
the rest vectorize successfully. The message "Cannot identify array bounds" is
not helpful.</pre>
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