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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - IRCE breaks simplified of loops"
href="https://llvm.org/bugs/show_bug.cgi?id=28764">28764</a>
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<th>Summary</th>
<td>IRCE breaks simplified of loops
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</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>Loop Optimizer
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
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<th>Reporter</th>
<td>michael.v.zolotukhin@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16833" name="attach_16833" title="Patch for enabling verification in loop-simplify">attachment 16833</a> <a href="attachment.cgi?id=16833&action=edit" title="Patch for enabling verification in loop-simplify">[details]</a></span>
Patch for enabling verification in loop-simplify
IRCE seems to break simplified form of loops, i.e. after it loops might be
missing a preheader or their exits might be not dedicated (i.e. exits have a
predecessors outside the loop).
That (along with some other problems) stops us from enabling loop-simplify
verification in the pass pipeline.
To reproduce the issue apply the attached patch (it enables verification in
loop-simplify) and then run 'ninja check'. I get the following failures:
Failing Tests (8):
LLVM :: Transforms/IRCE/conjunctive-checks.ll
LLVM :: Transforms/IRCE/decrementing-loop.ll
LLVM :: Transforms/IRCE/multiple-access-no-preloop.ll
LLVM :: Transforms/IRCE/only-upper-check.ll
LLVM :: Transforms/IRCE/single-access-no-preloop.ll
LLVM :: Transforms/IRCE/single-access-with-preloop.ll
LLVM :: Transforms/IRCE/skip-profitability-checks.ll
LLVM :: Transforms/IRCE/with-parent-loops.ll</pre>
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