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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - LoopVectorizer fails to vectorize loops with increasing integer induction variable"
href="http://llvm.org/bugs/show_bug.cgi?id=15720">15720</a>
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<th>Summary</th>
<td>LoopVectorizer fails to vectorize loops with increasing integer induction variable
</td>
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<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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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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
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</tr>
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<th>Reporter</th>
<td>reachanadi@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Loops having integer induction variable running from lower value to higher
value as shown in example below(0 to SIZE) are not vectorized.
int foo(int *aa, int *bb, int SIZE) {
int count = 190;
for(int i=0;i<SIZE;i++) {
aa[i] = bb[i] + count;
count++;
}
}
However, loops with integer induction variable running from higher value to
lower value(SIZE to 0) are successfully vectorized as in the example below.
int foo(int *aa, int *bb, int SIZE) {
int count = 190;
for(int i=SIZE;i > 0;i--) {
aa[i] = bb[i] + count;
count++;
}
}</pre>
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</p>
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