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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 - [OpenMP5.0] Wrong behavior when use array sections in map clauses on target and target data constructs"
href="https://bugs.llvm.org/show_bug.cgi?id=46426">46426</a>
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<th>Summary</th>
<td>[OpenMP5.0] Wrong behavior when use array sections in map clauses on target and target data constructs
</td>
</tr>
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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>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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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>
<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>In the examples below, clang has opposite behavior when compile:
These examples 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>
4.4 Array Sections in Device Constructs
According to the examples specification in the above url,
Example_array_sections.1.c should throw error,
Example_array_sections.3.c and,
Example_array_sections.4.c should not throw error,
but clang act opposite when compile, details are as below:
test case:
-----------------------------------
Example_array_sections.1.c
void foo ()
{
int A[30];
#pragma omp target data map( A[0:4] )
{
/* Cannot map distinct parts of the same array */
#pragma omp target map( A[7:20] )
{
A[2] = 0;
}
}
}
Example_array_sections.3.c
void foo ()
{
int A[30], *p;
#pragma omp target data map( A[0:4] )
{
p = &A[0];
#pragma omp target map( p[7:20] )
{
A[2] = 0;
p[8] = 0;
}
}
}
Example_array_sections.4.c
void foo ()
{
int A[30], *p;
#pragma omp target data map( A[0:10] )
{
p = &A[0];
#pragma omp target map( p[3:7] )
{
A[2] = 0;
p[8] = 0;
A[8] = 1;
}
}
}
test command:
------------------
# clang --version
clang version 10.0.0
Target: x86_64-unknown-linux-gnu
Thread model: posix
# clang -fopenmp-version=50 -fopenmp -S Example_array_sections.1.c
# clang -fopenmp-version=50 -fopenmp -S Example_array_sections.3.c
Example_array_sections.3.c:16:7: error: original storage of expression in data
environment is shared but data environment do not fully contain mapped
expression storage
A[2] = 0;
^
Example_array_sections.3.c:11:30: note: used here
#pragma omp target data map( A[0:4] )
^~~~~~
1 error generated.
]# clang -fopenmp-version=50 -fopenmp -S Example_array_sections.4.c
Example_array_sections.4.c:16:7: error: original storage of expression in data
environment is shared but data environment do not fully contain mapped
expression storage
A[2] = 0;
^
Example_array_sections.4.c:11:30: note: used here
#pragma omp target data map( A[0:10] )
^~~~~~~
1 error generated.</pre>
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