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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Merge r281586 into 3.9.1"
href="https://llvm.org/bugs/show_bug.cgi?id=31320">31320</a>
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<th>Summary</th>
<td>Merge r281586 into 3.9.1
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>3.9
</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
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>dimitry@andric.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Please merge r281586 into 3.9.1:
------------------------------------------------------------------------
r281586 | wmi | 2016-09-15 08:28:34 +0200 (Thu, 15 Sep 2016) | 11 lines
Add some shortcuts in LazyValueInfo to reduce compile time of Correlated Value
Propagation.
The patch is to partially fix PR10584. Correlated Value Propagation queries LVI
to check non-null for pointer params of each callsite. If we know the def of
param is an alloca instruction, we know it is non-null and can return early
from
LVI. Similarly, CVP queries LVI to check whether pointer for each mem access is
constant. If the def of the pointer is an alloca instruction, we know it is not
a constant pointer. These shortcuts can reduce the cost of CVP significantly.
Differential Revision: <a href="https://reviews.llvm.org/D18066">https://reviews.llvm.org/D18066</a>
------------------------------------------------------------------------
This greatly increases the performance of the Value Propagation pass in some
cases, and it is (as far as I can see) a low-impact, non-API changing fix.</pre>
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