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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Debuginfo] @llvm.dbg.value in loop prevents optimization in LoopIdiomRecognize"
href="https://bugs.llvm.org/show_bug.cgi?id=40564">40564</a>
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<th>Summary</th>
<td>[Debuginfo] @llvm.dbg.value in loop prevents optimization in LoopIdiomRecognize
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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>Linux
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<th>Status</th>
<td>NEW
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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>Loop Optimizer
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21418" name="attach_21418" title="reduced testcase">attachment 21418</a> <a href="attachment.cgi?id=21418&action=edit" title="reduced testcase">[details]</a></span>
reduced testcase
In LoopIdiomRecognize.cpp at line 1464 there is a check
if (CurLoop->getHeader()->size() != IdiomCanonicalSize ...
It seems that a llvm.dbg.value affects the header size value, and so prevents
this optimization. If they are removed from the loop (bb8) in the test case,
the loop is later removed.
bin/opt -mtriple=systemz-unknown -mcpu=z13 -S tc_loopidioms_delete.ll -o -
-loop-idiom -loop-deletion</pre>
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