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<body><span class="vcard"><a class="email" href="mailto:brzycki@gmail.com" title="Brian Rzycki <brzycki@gmail.com>"> <span class="fn">Brian Rzycki</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - SimplifyCFG is not collapsing unneeded switches"
href="http://bugs.llvm.org/show_bug.cgi?id=2563">bug 2563</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>brzycki@gmail.com
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>WORKSFORME
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - SimplifyCFG is not collapsing unneeded switches"
href="http://bugs.llvm.org/show_bug.cgi?id=2563#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - SimplifyCFG is not collapsing unneeded switches"
href="http://bugs.llvm.org/show_bug.cgi?id=2563">bug 2563</a>
from <span class="vcard"><a class="email" href="mailto:brzycki@gmail.com" title="Brian Rzycki <brzycki@gmail.com>"> <span class="fn">Brian Rzycki</span></a>
</span></b>
<pre>While inspecting ComputeValueKnownInPredecessors() in JumpThreading.cpp we came
across the following comment:
/// TODO: Per PR2563, we could infer value range information about a
/// predecessor based on its terminator.
We went to see if this is still an issue given the age of this ticket with a
recent tip build of LLVM.
The output at -O3 looks like the following:
cond.false3.i17.i: ; preds = %grad.exit48.i
%27 = or i32 %and.i12.i, 2
%28 = icmp eq i32 %27, 14
%cond9.i16.i = select i1 %28, double %sub.i, double 0xBFCE147AE147B000
br label %grad.exit28.i
This is almost identical to the code transform Eli suggested in <a href="show_bug.cgi?id=2563#c3">Comment 3</a>. I
think this ticket can be closed as done.</pre>
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