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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - OpenMP: array element not allowed in reduction clause"
href="https://bugs.llvm.org/show_bug.cgi?id=45717">45717</a>
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<th>Summary</th>
<td>OpenMP: array element not allowed in reduction clause
</td>
</tr>
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<th>Product</th>
<td>OpenMP
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<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
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</tr>
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<th>Reporter</th>
<td>david.pagan@intel.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Compiler generates an error when array element is referred to in a reduction
clause. Spec seems to say this is valid, and other compilers accept it.
Test case:
static short x[100];
static short y[100];
static const int N = 100;
void test() {
short (*yptr)[N] = &y;
#pragma omp parallel for simd reduction(+:yptr[0])
for(int i = 0; i < N; i++) {
yptr[0][25 + i/4] += x[i];
}
}
Compile: clang -fopenmp test.cpp
Error:
test.cpp:8:43: error: list item of type 'int [100]' is not valid for specified
reduction operation: unable to provide default initialization value
#pragma omp parallel for simd reduction(+:yptr[0])
~ ^
test.cpp:7:11: note: 'yptr' defined here
int (*yptr)[N] = &y;
^
1 error generated.</pre>
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