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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - In case of -ffast-math, the Loop Vectorizer can generate mis-optimized code"
href="https://bugs.llvm.org/show_bug.cgi?id=34245">34245</a>
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<th>Summary</th>
<td>In case of -ffast-math, the Loop Vectorizer can generate mis-optimized code
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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
</td>
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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>Loop Optimizer
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>gareevroman@gmail.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=19009" name="attach_19009" title="Code generated using the -ffast-math option.">attachment 19009</a> <a href="attachment.cgi?id=19009&action=edit" title="Code generated using the -ffast-math option.">[details]</a></span>
Code generated using the -ffast-math option.
In case of -ffast-math, the Loop Vectorizer can generate mis-optimized code.
For example, in case of "opt without-ffast-math.ll -loop-vectorize -S", I get
without-ffast-math-result.ll, which contains 478 lines of code.
However,, if I run "opt with-ffast-math.ll -loop-vectorize -S", I get
with-ffast-math-result.ll, which contains 1432 lines of code and leads to
execution time regression.</pre>
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