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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Long compile time due to domain building"
href="https://llvm.org/bugs/show_bug.cgi?id=26382">26382</a>
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<th>Summary</th>
<td>Long compile time due to domain building
</td>
</tr>
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<th>Product</th>
<td>Polly
</td>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Optimizer
</td>
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<th>Assignee</th>
<td>polly-dev@googlegroups.com
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<th>Reporter</th>
<td>chrisj@codeaurora.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=15758" name="attach_15758" title="Test case">attachment 15758</a> <a href="attachment.cgi?id=15758&action=edit" title="Test case">[details]</a></span>
Test case
Command:
opt -polly-process-unprofitable -polly-code-generator=isl -polly-scops
-analyze long_compile.ll
The attached test is taking a very long time to compile and I noticed it was in
in the below set of complements and coalescing in buildConditionSets
(ScopInfo.cpp)
Function signature:
void buildConditionSets(Scop &S, Value *Condition, TerminatorInst *TI, Loop *L,
__isl_keep isl_set *Domain,
SmallVectorImpl<__isl_give isl_set *> &ConditionSets)
..
..
isl_set *AlternativeCondSet =
isl_set_complement(isl_set_copy(ConsequenceCondSet));
ConditionSets.push_back(isl_set_coalesce(
isl_set_intersect(ConsequenceCondSet, isl_set_copy(Domain))));
ConditionSets.push_back(isl_set_coalesce(
isl_set_intersect(AlternativeCondSet, isl_set_copy(Domain))));
..
..
The test finally got over after ~132 minutes and the number of sets in
ConsequenceCondSet grew to 2187. In buildDomainsWithBranchConstraints, size of
SuccDomain does cross the limit of 20 (MaxConjunctsInDomain) and we do make it
empty. I was wondering if we could safely bail out from domain building and
invalidate the current Scop in such a case rather than continuing with the
algorithm.</pre>
</div>
</p>
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