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annotate openmp/docs/remarks/OMP130.rst @ 266:00f31e85ec16 default tip
Added tag current for changeset 31d058e83c98
| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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| date | Sat, 14 Oct 2023 10:13:55 +0900 |
| parents | c4bab56944e8 |
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| rev | line source |
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1 .. _omp130: |
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70dce7da266c
llvm original Jul 20 16:41:34 2021
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
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| 223 | 3 Removing unused state machine from generic-mode kernel. [OMP130] |
| 4 ================================================================ | |
| 5 | |
| 6 This optimization remark indicates that an unused state machine was removed from | |
| 7 a target region. This occurs when there are no parallel regions inside of a | |
| 8 target construct. Normally, a state machine is required to schedule the threads | |
| 9 inside of a parallel region. If there are no parallel regions, the state machine | |
| 236 | 10 is unnecessary because there is only a single thread active at any time. |
| 223 | 11 |
| 12 Examples | |
| 13 -------- | |
| 14 | |
| 15 This optimization should occur on any target region that does not contain any | |
| 16 parallel work. | |
| 17 | |
| 18 .. code-block:: c++ | |
| 19 | |
| 20 void copy(int N, double *X, double *Y) { | |
| 21 #pragma omp target teams distribute map(tofrom: X[0:N]) map(tofrom: Y[0:N]) | |
| 22 for (int i = 0; i < N; ++i) | |
| 23 Y[i] = X[i]; | |
| 24 } | |
| 25 | |
| 26 .. code-block:: console | |
| 27 | |
| 28 $ clang++ -fopenmp -fopenmp-targets=nvptx64 -O2 -Rpass=openmp-opt omp130.cpp | |
| 29 omp130.cpp:2:1: remark: Removing unused state machine from generic-mode kernel. [OMP130] | |
| 30 #pragma omp target teams distribute map(tofrom: X[0:N]) map(tofrom: Y[0:N]) | |
| 31 ^ | |
| 32 | |
| 33 Diagnostic Scope | |
| 34 ---------------- | |
| 35 | |
| 36 OpenMP target offloading optimization remark. |