openmp/runtime/test/tasking/task_reduction4.c

   1 // RUN: %libomp-compile-and-run
   2
   3 // XFAIL: icc
   4 // UNSUPPORTED: clang-4, clang-5, clang-6, clang-7, clang-8, clang-9, clang-10
   5 // UNSUPPORTED: gcc-4, gcc-5, gcc-6, gcc-7, gcc-8
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9
  10 int a = 0, b = 1;
  11
  12 int main(int argc, char **argv) {
  13
  14   #pragma omp parallel reduction(task, +:a) reduction(task, *:b)
  15   {
  16     #pragma omp single
  17     {
  18       int i;
  19       for (i = 1; i <= 5; ++i) {
  20         #pragma omp task in_reduction(+: a) in_reduction(*: b)
  21         {
  22           a += i;
  23           b *= i;
  24         }
  25       }
  26     }
  27   }
  28
  29   if (a != 15) {
  30     fprintf(stderr, "error: a != 15. Instead a = %d\n", a);
  31     exit(EXIT_FAILURE);
  32   }
  33   if (b != 120) {
  34     fprintf(stderr, "error: b != 120. Instead b = %d\n", b);
  35     exit(EXIT_FAILURE);
  36   }
  37
  38   return EXIT_SUCCESS;
  39 }