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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - An iteration of a loop execute more than one ordered region which throw an error"
href="https://bugs.llvm.org/show_bug.cgi?id=46347">46347</a>
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<th>Summary</th>
<td>An iteration of a loop execute more than one ordered region which throw an error
</td>
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<th>Product</th>
<td>OpenMP
</td>
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<th>Version</th>
<td>unspecified
</td>
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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>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Clang Compiler Support
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>yangzh.fnst@cn.fujitsu.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Hi,
Follow the OpenMP's Specfications:
During execution of an iteration of a worksharing-loop or a loop nest within a
worksharing-loop, simd, or worksharing-loop SIMD region, a thread must not
execute more than one ordered region corresponding to an ordered construct
without a depend clause.
<a href="https://www.openmp.org/spec-html/5.0/openmpsu97.html#x128-5010002.17.9">https://www.openmp.org/spec-html/5.0/openmpsu97.html#x128-5010002.17.9</a>
The following code shoule be error. But there is no error.
Example_ordered.2.c: This code comes 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>
void work(int i) {}
void ordered_wrong(int n)
{
int i;
#pragma omp for ordered
for (i=0; i<n; i++) {
/* incorrect because an iteration may not execute more than one
ordered region */
#pragma omp ordered
work(i);
#pragma omp ordered
work(i+1);
}
}
clang version: clang10.0.0
command:
clang -fopenmp -S test.c</pre>
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