<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 - [OpenMP5.0] A worksharing region closely nested inside a worksharing region should return an error"
href="https://bugs.llvm.org/show_bug.cgi?id=46359">46359</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[OpenMP5.0] A worksharing region closely nested inside a worksharing region should return an error
</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>sulinna@cn.fujitsu.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>According to OpenMP5.0's Restriction：
2.20 Nesting of Regions
A worksharing region may not be closely nested inside a worksharing, loop,
task, taskloop, critical, ordered, atomic, or master region.
<a href="https://www.openmp.org/spec-html/5.0/openmpse28.html#x143-6330002.20">https://www.openmp.org/spec-html/5.0/openmpse28.html#x143-6330002.20</a>
closely nested construct：
A construct nested inside another construct with no other construct nested
between them.
<a href="https://www.openmp.org/spec-html/5.0/openmpsu2.html#x9-80001.2.2">https://www.openmp.org/spec-html/5.0/openmpsu2.html#x9-80001.2.2</a>
The following examples are non-conforming because the inner and outer loop
regions are closely nested，clang should report an error for case
nesting_restrict.2.c as nesting_restrict.1.c.
These testcases are from：
<a href="https://www.openmp.org/wp-content/uploads/openmp-examples-5.0.0.pdf">https://www.openmp.org/wp-content/uploads/openmp-examples-5.0.0.pdf</a>
p378
nesting_restrict.1.c
-----------------------
void work(int i, int j) {}
void wrong1(int n)
{
#pragma omp parallel default(shared)
{
int i, j;
#pragma omp for
for (i=0; i<n; i++) {
/* incorrect nesting of loop regions */
#pragma omp for
for (j=0; j<n; j++)
work(i, j);
}
}
}
------------------------
# clang -fopenmp-version=50 -fopenmp -S Example_nesting_restrict.1.c
Example_nesting_restrict.1.c:20:8: error: region cannot be closely nested
inside 'for' region; perhaps you forget to enclose 'omp for' directive into a
parallel region?
#pragma omp for
^
1 error generated.
nesting_restrict.2.c
----------------------
void work(int i, int j) {}
void work1(int i, int n)
{
int j;
/* incorrect nesting of loop regions */
#pragma omp for
for (j=0; j<n; j++)
work(i, j);
}
void wrong2(int n)
{
#pragma omp parallel default(shared)
{
int i;
#pragma omp for
for (i=0; i<n; i++)
work1(i, n);
}
}
-----------------------
# clang -fopenmp-version=50 -fopenmp -S Example_nesting_restrict.2.c</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>