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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Similar loops are not always vectorized"
href="http://llvm.org/bugs/show_bug.cgi?id=21065">21065</a>
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<th>Summary</th>
<td>Similar loops are not always vectorized
</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>
</tr>
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<th>OS</th>
<td>Linux
</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>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>calixte.denizet@gmail.com
</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>The generated IR (with clang -O3) from this code:
#include <stdlib.h>
void foo(double * d, unsigned int size)
{
for (unsigned int i = 0; i < size; ++i)
{
d[i] += 1;
}
}
void bar(unsigned int size)
{
double * d = malloc(size * sizeof(double));
for (unsigned int i = 0; i < size; ++i)
{
d[i] += 1;
}
foobar(d);
}
void oof(unsigned int size)
{
double * d = malloc(size * sizeof(double));
foo(d, size);
foobar(d);
}
shows that the loop in foo is vectorized but not in bar.
The call to foo in oof has been inlined but the vectorization has been removed.</pre>
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