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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Variable used by task inside a template function is not made firstprivate by default"
href="https://bugs.llvm.org/show_bug.cgi?id=47621">47621</a>
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<th>Summary</th>
<td>Variable used by task inside a template function is not made firstprivate by default
</td>
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<th>Product</th>
<td>OpenMP
</td>
</tr>
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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>
</tr>
<tr>
<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>Clang Compiler Support
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>fmorac@udel.edu
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23992" name="attach_23992" title="Full test">attachment 23992</a> <a href="attachment.cgi?id=23992&action=edit" title="Full test">[details]</a></span>
Full test
Description:
Variable used by a task region inside a template function is not made
firstprivate by default as per defined in the OpenMP specification at the end
of section 2.19.1.1.
Extract from test.cpp where the bug is located:
====================================================================
template <typename T = void> int template_test(int n) {
std::vector<int> values(n, 0);
#pragma omp parallel
{
#pragma omp single
{
for (int i = 0; i < n; ++i)
#pragma omp task
values[i] = i;
}
}
int diffs = 0;
for (int i = 0; i < n; ++i)
if (values[i] != i)
++diffs;
return diffs;
}
====================================================================
The expected return value for the template_test function is 0.
Expected test results:
====================================================================
Non-template test: PASS
Template test: PASS
Template test with first-private clause: PASS
====================================================================
Tested compilers:
clang-9, clang-10, clang-12
Compilers where the bug can be found:
clang-9, clang-10, clang-12
Testing platform:
Debian testing, Ubuntu Bionic Beaver
Current test results:
====================================================================
Non-template test: PASS
Template test: FAIL
Template test with first-private clause: PASS
====================================================================
Steps to reproduce:
1. clang++ -fopenmp test.cpp -o test
2. ./test
Related bug:
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Variable used by task is not made firstprivate by default as suggested by the Spec (end of section 2.15.1.1)"
href="show_bug.cgi?id=39422">https://bugs.llvm.org/show_bug.cgi?id=39422</a></pre>
</div>
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