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37 lines
1.2 KiB
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37 lines
1.2 KiB
ReStructuredText
.. _omp130:
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Removing unused state machine from generic-mode kernel. [OMP130]
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================================================================
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This optimization remark indicates that an unused state machine was removed from
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a target region. This occurs when there are no parallel regions inside of a
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target construct. Normally, a state machine is required to schedule the threads
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inside of a parallel region. If there are no parallel regions, the state machine
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is unnecessary because there is only a single thread active at any time.
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Examples
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--------
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This optimization should occur on any target region that does not contain any
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parallel work.
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.. code-block:: c++
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void copy(int N, double *X, double *Y) {
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#pragma omp target teams distribute map(tofrom: X[0:N]) map(tofrom: Y[0:N])
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for (int i = 0; i < N; ++i)
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Y[i] = X[i];
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}
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.. code-block:: console
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$ clang++ -fopenmp -fopenmp-targets=nvptx64 -O2 -Rpass=openmp-opt omp130.cpp
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omp130.cpp:2:1: remark: Removing unused state machine from generic-mode kernel. [OMP130]
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#pragma omp target teams distribute map(tofrom: X[0:N]) map(tofrom: Y[0:N])
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^
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Diagnostic Scope
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----------------
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OpenMP target offloading optimization remark.
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