1.. _omp130: 2 3Removing unused state machine from generic-mode kernel. [OMP130] 4================================================================ 5 6This optimization remark indicates that an unused state machine was removed from 7a target region. This occurs when there are no parallel regions inside of a 8target construct. Normally, a state machine is required to schedule the threads 9inside of a parallel region. If there are no parallel regions, the state machine 10is unnecessary because there is only a single thread active at any time. 11 12Examples 13-------- 14 15This optimization should occur on any target region that does not contain any 16parallel 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 33Diagnostic Scope 34---------------- 35 36OpenMP target offloading optimization remark. 37