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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 - SIMD & reduction on signed types emits sign-conversion diagnostic"
href="https://bugs.llvm.org/show_bug.cgi?id=45959">45959</a>
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<th>Summary</th>
<td>SIMD & reduction on signed types emits sign-conversion diagnostic
</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>
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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>clang@evan.coeusgroup.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>With -Wsign-conversion, an & reduction on an integer value will emit a
diagnostic. Here is a simple test case:
int foo(int* v);
int foo(int* v) {
int r = ~0;
#pragma omp simd reduction(&:r)
for (int i = 0 ; i < 8 ; i++) {
r &= v[i];
}
return r;
}
When compiling:
$ clang -Weverything -fopenmp-simd -c -o simd.o simd.c
simd.c:6:32: warning: implicit conversion changes signedness: 'unsigned int'
to 'int' [-Wsign-conversion]
#pragma omp simd reduction(&:r)
^
1 warning generated.</pre>
</div>
</p>
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