text: // RUN: %libomp-compile-and-run
  
  // Parsing error until gcc8:
  // UNSUPPORTED: gcc-4, gcc-5, gcc-6, gcc-7, gcc-8
  
  // Missing GOMP_taskgroup_reduction_(un)register in LLVM/OpenMP
  // Should be removed once the functions are implemented
  // XFAIL: gcc-9, gcc-10
  
  #include <stdio.h>
  #include <omp.h>
  
  int r;
  
  int work(int k, int l)
  {
    return k + l + 1;
  }
  void bar(int i) {
    #pragma omp taskgroup task_reduction(+:r)
   { int th_gen = omp_get_thread_num();
    #pragma omp task in_reduction(+:r) firstprivate(i, th_gen)
    {
      r += work(i, 0);
  printf("executing task (%d, 0), th %d (gen by th %d)\n", i, omp_get_thread_num(), th_gen);
    }
    #pragma omp task in_reduction(+:r) firstprivate(i, th_gen)
    {
      r += work(i, 1);
  printf("executing task (%d, 1), th %d (gen by th %d)\n", i, omp_get_thread_num(), th_gen);
    }
   }
  }
  int foo() {
    int i;
    int th_gen = omp_get_thread_num();
    #pragma omp taskgroup task_reduction(+:r)
    {
      bar(0);
    }
  printf("th %d passed bar0\n", th_gen);
    #pragma omp taskloop reduction(+:r) firstprivate(th_gen)
    for (i = 1; i < 4; ++i) {
      bar(i);
  printf("th %d (gen by th %d) passed bar%d in taskloop\n", omp_get_thread_num(), th_gen, i);
    #pragma omp task in_reduction(+:r)
      r += i;
    }
    return 0;
  }
  // res = 2*((1+2)+(2+3)+(3+4)+(4+5)+1+2+3) = 60
  #define res 60
  int main()
  {
    r = 0;
    #pragma omp parallel num_threads(2)
      foo();
    if (r == res) {
      return 0;
    } else {
      printf("error r = %d (!= %d)\n", r, res);
      return 1;
    }
  }
  