1 // RUN: %libomp-compile-and-run
2 
3 // Parsing error until gcc8:
4 // UNSUPPORTED: gcc-4, gcc-5, gcc-6, gcc-7, gcc-8
5 
6 // Parsing error until clang11:
7 // UNSUPPORTED: clang-10, clang-9, clang-8, clang-7
8 
9 // Missing GOMP_taskgroup_reduction_(un)register in LLVM/OpenMP
10 // Should be removed once the functions are implemented
11 // XFAIL: gcc-9, gcc-10
12 
13 #include <stdio.h>
14 #include <omp.h>
15 
16 int r;
17 
18 int work(int k, int l)
19 {
20   return k + l + 1;
21 }
22 void bar(int i) {
23   #pragma omp taskgroup task_reduction(+:r)
24  { int th_gen = omp_get_thread_num();
25   #pragma omp task in_reduction(+:r) firstprivate(i, th_gen)
26   {
27     r += work(i, 0);
28 printf("executing task (%d, 0), th %d (gen by th %d)\n", i, omp_get_thread_num(), th_gen);
29   }
30   #pragma omp task in_reduction(+:r) firstprivate(i, th_gen)
31   {
32     r += work(i, 1);
33 printf("executing task (%d, 1), th %d (gen by th %d)\n", i, omp_get_thread_num(), th_gen);
34   }
35  }
36 }
37 int foo() {
38   int i;
39   int th_gen = omp_get_thread_num();
40   #pragma omp taskgroup task_reduction(+:r)
41   {
42     bar(0);
43   }
44 printf("th %d passed bar0\n", th_gen);
45   #pragma omp taskloop reduction(+:r) firstprivate(th_gen)
46   for (i = 1; i < 4; ++i) {
47     bar(i);
48 printf("th %d (gen by th %d) passed bar%d in taskloop\n", omp_get_thread_num(), th_gen, i);
49   #pragma omp task in_reduction(+:r)
50     r += i;
51   }
52   return 0;
53 }
54 // res = 2*((1+2)+(2+3)+(3+4)+(4+5)+1+2+3) = 60
55 #define res 60
56 int main()
57 {
58   r = 0;
59   #pragma omp parallel num_threads(2)
60     foo();
61   if (r == res) {
62     return 0;
63   } else {
64     printf("error r = %d (!= %d)\n", r, res);
65     return 1;
66   }
67 }
68