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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]'isa' and 'arch' trait in 'device' context selector not supported"
href="https://bugs.llvm.org/show_bug.cgi?id=46338">46338</a>
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<th>Summary</th>
<td>[OpenMP5.0]'isa' and 'arch' trait in 'device' context selector not supported
</td>
</tr>
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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>
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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>
</tr>
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<th>Reporter</th>
<td>sulinna@cn.fujitsu.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<pre>In OpenMP5.0's specifiction(2.3.1 OpenMP Context) of the url below, device set
includes traits: kind, isa, arch, but clang seems not supported the 'isa',
'arch' trait.
<a href="https://www.openmp.org/spec-html/5.0/openmpsu25.html#x42-490002.3.1">https://www.openmp.org/spec-html/5.0/openmpsu25.html#x42-490002.3.1</a>
test case:
----------------------
#include <omp.h>
void base_saxpy(int, float, float *, float *);
void avx512_saxpy(int, float, float *, float *);
#pragma omp declare variant( avx512_saxpy ) \
match( device={isa("core-avx512")} )
void base_saxpy(int n, float s, float *x, float *y) // base function
{
#pragma omp parallel for
for(int i=0; i<n; i++) y[i] = s*x[i] + y[i];
}
void avx512_saxpy(int n, float s, float *x, float *y) //function variant
{
//assume 64-byte alignment for AVX-512
#pragma omp parallel for simd simdlen(16) aligned(x,y:64)
for(int i=0; i<n; i++) y[i] = s*x[i] + y[i];
}
test command:
-------------------------
# clang --version
clang version 10.0.0
Target: x86_64-unknown-linux-gnu
Thread model: posix
# clang -fopenmp-version=50 -fopenmp -S declare_variant.2.c
declare_variant.2.c:7:41: warning: unknown context selector in 'device' context
selector set of 'omp declare variant' directive, ignored [-Wopenmp-clauses]
match( device={isa("core-avx512")} )
^
1 warning generated.
When i change test case selector to 'match( device={arch("x86")} )', It
unrecognized device selector 'arch' too.
declare_variant.2.c:7:42: warning: unknown context selector in 'device' context
selector set of 'omp declare variant' directive, ignored [-Wopenmp-clauses]
match( device={arch("x86")} )
^
1 warning generated.
Is Clang supposed not to support 'isa', 'arch' trait in 'device' context
selector?</pre>
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