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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Seeing different schedule for similar program"
href="https://llvm.org/bugs/show_bug.cgi?id=26960">26960</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Seeing different schedule for similar program
</td>
</tr>
<tr>
<th>Product</th>
<td>Polly
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</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>Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>polly-dev@googlegroups.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>zinob@codeaurora.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16044" name="attach_16044" title="testb">attachment 16044</a> <a href="attachment.cgi?id=16044&action=edit" title="testb">[details]</a></span>
testb
I used the command below
opt -polly -polly-opt-isl -O3 -debug -polly-process-unprofitable
-polly-opt-fusion=max -polly-opt-max-coefficient=-1 < testa.ll
opt -polly -polly-opt-isl -O3 -debug -polly-process-unprofitable
-polly-opt-fusion=max -polly-opt-max-coefficient=-1 < testb.ll
testa.ll and testb.ll should have same schedule. I just swapped the trip count
between the adjacent loop. See below schedule:
Q1: Why loop fusion is not happening although I am using max strategy?
!2: Why in one case preheader of second loop is hoisted and other case is not?
testb:
: isl ast :: foo :: entry.split => for.cond.cleanup4
[m, n] -> { : -2147483648 <= m <= 2147483647 and -2147483648 <= n <=
2147483647 }
[m, n] -> { Stmt_for_body5[i0] -> [3, i0] : 0 <= i0 < n; Stmt_for_body_lr_ph[]
-> [1, 0] : m > 0; Stmt_for_body5_lr_ph[] -> [0, 0] : n > 0; Stmt_for_body[i0]
-> [2, i0] : 0 <= i0 < m }
if (1)
{
if (n >= 1)
Stmt_for_body5_lr_ph();
if (m >= 1)
Stmt_for_body_lr_ph();
for (int c0 = 0; c0 < m; c0 += 1)
Stmt_for_body(c0);
for (int c0 = 0; c0 < n; c0 += 1)
Stmt_for_body5(c0);
}
testa
:: isl ast :: foo :: entry.split => for.cond.cleanup4
[n, m] -> { : -2147483648 <= n <= 2147483647 and -2147483648 <= m <=
2147483647 }
[n, m] -> { Stmt_for_body5[i0] -> [3, i0] : 0 <= i0 < m; Stmt_for_body[i0] ->
[1, i0] : 0 <= i0 < n; Stmt_for_body_lr_ph[] -> [0, 0] : n > 0;
Stmt_for_body5_lr_ph[] -> [2, 0] : m > 0 }
if (1)
{
if (n >= 1)
Stmt_for_body_lr_ph();
for (int c0 = 0; c0 < n; c0 += 1)
Stmt_for_body(c0);
if (m >= 1)
Stmt_for_body5_lr_ph();
for (int c0 = 0; c0 < m; c0 += 1)
Stmt_for_body5(c0);
}</pre>
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