<html>
<head>
<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 --- - vectorization remark is printed multiple times"
href="https://llvm.org/bugs/show_bug.cgi?id=27618">27618</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>vectorization remark is printed multiple times
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.8
</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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>albertnetymk@gmail.com
</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>```
#define SIZE (1 << 15)
#define MINDEX(n, m) (SIZE*(n)+(m))
#define XMM_ALIGNMENT_BYTES 16
float *restrict mat_a __attribute__((aligned (XMM_ALIGNMENT_BYTES)));
float *restrict vec_b __attribute__((aligned (XMM_ALIGNMENT_BYTES)));
float *restrict vec_c __attribute__((aligned (XMM_ALIGNMENT_BYTES)));
// __attribute__ ((noinline))
void matvec_autovec()
{
int i, j;
float tmp;
for (i = 0; i < SIZE; i++) {
tmp = 0;
for (j = 0; j < SIZE; j++) {
tmp += mat_a[MINDEX(i, j)] * vec_b[j];
}
vec_c[i] = tmp;
}
}
void multiple()
{
matvec_autovec();
}
int main(int argc, char **argv)
{
return 0;
}
```
The command I used is `clang-3.8 -Ofast test.c -Rpass=loop-vectorize`
```
test.c:22:9: remark: vectorized loop (vectorization width: 4, interleaved
count: 1) [-Rpass=loop-vectorize]
for (j = 0; j < SIZE; j++) {
^
test.c:22:9: remark: vectorized loop (vectorization width: 4, interleaved
count: 1) [-Rpass=loop-vectorize]
```
The output reduces to 1 after I uncomment the `noinline` attribute.</pre>
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