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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Delinearization fails when loop indexes are in reverse order"
href="http://llvm.org/bugs/show_bug.cgi?id=19336">19336</a>
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<tr>
<th>Summary</th>
<td>Delinearization fails when loop indexes are in reverse order
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tobias@grosser.es
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</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=12342" name="attach_12342" title="Reduced test case">attachment 12342</a> <a href="attachment.cgi?id=12342&action=edit" title="Reduced test case">[details]</a></span>
Reduced test case
We can sucessfully delinearize this piece of code:
A[][dim_size];
for (i = 0; i < n; i++)_
for (j = 0; j < n; j++)
A[i][j]
AddRec: {{%A,+,(4 * %dim_size)}<%loop.i>,+,4}<%loop.j>
Base offset: %A
ArrayDecl[UnknownSize][%dim_size] with elements of 4 bytes.
ArrayRef[{0,+,1}<%loop.i>][{0,+,1}<%loop.j>]
but fail for:
A[][dim_size];
for (i = 0; i < n; i++)_
for (j = 0; j < n; j++)
A[j][i]
AddRec: {{%A,+,4}<%loop.i>,+,(4 * %dim_size)}<%loop.j>
Base offset: %A
ArrayDecl[UnknownSize][1] with elements of 4 bytes.
ArrayRef[{0,+,1}<%loop.i>][{0,+,%dim_size}<%loop.j>]</pre>
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