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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - reassociate pass needs to check for function-level fast-ness"
href="http://llvm.org/bugs/show_bug.cgi?id=21291">21291</a>
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<th>Summary</th>
<td>reassociate pass needs to check for function-level fast-ness
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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>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>spatel+llvm@rotateright.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Filing this bug as requested in <a href="http://reviews.llvm.org/D5222">http://reviews.llvm.org/D5222</a> and discussed in
<a href="http://reviews.llvm.org/D5787">http://reviews.llvm.org/D5787</a>.
Currently, the reassociate pass checks for IR-level fast-math-flags (FMF) when
performing optimizations. It should also check function-level attributes to see
if reassociation is allowed.
LTO (and possibly just regular inlining?) creates a scenario where non-fast
instructions could end up in a function that has some level of fast-ness. In
that case, the parent function's attributes apply to whatever was inlined.
The other case where IR level FMF is not currently available is with FP
intrinsics. This is tracked by <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - FP intrinsics need to have fast-math-flags too"
href="show_bug.cgi?id=21290">bug 21290</a>.</pre>
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