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<body><span class="vcard"><a class="email" href="mailto:regehr@cs.utah.edu" title="John Regehr <regehr@cs.utah.edu>"> <span class="fn">John Regehr</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - LVI should understand conditional branches where the condition is a conjunction or disjunction"
href="https://llvm.org/bugs/show_bug.cgi?id=27296">bug 27296</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
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<td style="text-align:right;">Resolution</td>
<td>---
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<td>WORKSFORME
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - LVI should understand conditional branches where the condition is a conjunction or disjunction"
href="https://llvm.org/bugs/show_bug.cgi?id=27296#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - LVI should understand conditional branches where the condition is a conjunction or disjunction"
href="https://llvm.org/bugs/show_bug.cgi?id=27296">bug 27296</a>
from <span class="vcard"><a class="email" href="mailto:regehr@cs.utah.edu" title="John Regehr <regehr@cs.utah.edu>"> <span class="fn">John Regehr</span></a>
</span></b>
<pre>Well.... I made a fix for this which intersected any constant ranges found in a
tree of and instructions on taken branch of a conditional, and in a tree of or
instructions found on the false branch of a conditional. This logic fires a lot
but the increase in precision is very unimpressive and so are the resulting
optimizations. For example across all of SPEC CINT 2006 the binary size is
reduced by a few hundred bytes as a result of the added LVI precision. So
overall the benefit of this patch doesn't seem to outweigh the extra
complexity.</pre>
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