<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - '# pragma clang loop vectorize (disable) 'doesn't work when -fopenmp is added to compilation options"
href="https://bugs.llvm.org/show_bug.cgi?id=45753">45753</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>'# pragma clang loop vectorize (disable) 'doesn't work when -fopenmp is added to compilation options
</td>
</tr>
<tr>
<th>Product</th>
<td>OpenMP
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Clang Compiler Support
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>fj8765ah@aa.jp.fujitsu.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Some programs have both '# pragma clang loop vectorize (disable)' and '# pragma
omp parallel for' written.
Adding -fopenmp when compiling this program will run 'vectorized loop'.
I thought that 'vectorized loop' should not work with -fopenmp.
What do you think?
$ clang -O2 -Rpass=loop-vectorize a.c -S
openmp.c:9:3: remark: interleaved loop (interleaved count: 2)
[-Rpass=loop-vectorize]
for (i=0;i<n;++i) {
^
$ clang -O2 -Rpass=loop-vectorize a.c -S -fopenmp
openmp.c:7:1: remark: vectorized loop (vectorization width: 4, interleaved
count: 2) [-Rpass=loop-vectorize] #pragma omp parallel for ^
- a.c
void sub(float * restrict a,
float * restrict b,
float * restrict c,
int n) {
int i;
#pragma omp parallel for
#pragma clang loop vectorize(disable)
for (i=0;i<n;++i) {
c[i] = a[i] + b[i];
}
}</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>