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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [Polly] Schedule does not model irreducible control flow"
href="https://llvm.org/bugs/show_bug.cgi?id=25909">25909</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[Polly] Schedule does not model irreducible control flow
</td>
</tr>
<tr>
<th>Product</th>
<td>Projects
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Polly
</td>
</tr>
<tr>
<th>Assignee</th>
<td>polly-dev@googlegroups.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tobias@grosser.es
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=15507" name="attach_15507" title="Irredubicle control flow">attachment 15507</a> <a href="attachment.cgi?id=15507&action=edit" title="Irredubicle control flow">[details]</a></span>
Irredubicle control flow
For a test cast that contains irregular control flow with loops (attached)
we do not generate loop dimensions in the schedule:
Stmt_start_split
Domain :=
[p] -> { Stmt_start_split[] };
Schedule :=
[p] -> { Stmt_start_split[] -> [0] };
MustWriteAccess := [Reduction Type: NONE] [Scalar: 1]
[p] -> { Stmt_start_split[] -> MemRef_cmp[] };
Stmt_S1
Domain :=
[p] -> { Stmt_S1[] : p <= 0 };
Schedule :=
[p] -> { Stmt_S1[] -> [1] };
MustWriteAccess := [Reduction Type: NONE] [Scalar: 0]
[p] -> { Stmt_S1[] -> MemRef_A[0] };
Stmt_S2
Domain :=
[p] -> { Stmt_S2[] : p >= 1 };
Schedule :=
[p] -> { Stmt_S2[] -> [2] };
MustWriteAccess := [Reduction Type: NONE] [Scalar: 0]
[p] -> { Stmt_S2[] -> MemRef_A[0] };
This is likely to be wrong and we should probably just detect irregular control
flow and bail out if found.</pre>
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