1 // RUN: %libomp-cxx-compile-and-run
2 
3 #include <stdio.h>
4 #include <omp.h>
5 
6 #define NT 4
7 #define INIT 10
8 
9 /*
10 The test emulates code generation needed for reduction with task modifier on
11 parallel construct.
12 
13 Note: tasks could just use in_reduction clause, but compiler does not accept
14 this because of bug: it mistakenly requires reduction item to be shared, which
15 is only true for reduction on worksharing and wrong for task reductions.
16 */
17 
18 //------------------------------------------------
19 // OpenMP runtime library routines
20 #ifdef __cplusplus
21 extern "C" {
22 #endif
23 extern void *__kmpc_task_reduction_get_th_data(int gtid, void *tg, void *item);
24 // extern void* __kmpc_task_reduction_modifier_init(void *loc, int gtid, int
25 // is_ws, int num, void* data);
26 extern void *__kmpc_taskred_modifier_init(void *loc, int gtid, int is_ws,
27                                           int num, void *data);
28 extern void __kmpc_task_reduction_modifier_fini(void *loc, int gtid, int is_ws);
29 extern int __kmpc_global_thread_num(void *);
30 #ifdef __cplusplus
31 }
32 #endif
33 
34 //------------------------------------------------
35 // Compiler-generated code
36 
37 typedef struct red_input {
38   void *reduce_shar; /**< shared between tasks item to reduce into */
39   void *reduce_orig; /**< original reduction item used for initialization */
40   size_t reduce_size; /**< size of data item in bytes */
41   // three compiler-generated routines (init, fini are optional):
42   void *reduce_init; /**< data initialization routine (single parameter) */
43   void *reduce_fini; /**< data finalization routine */
44   void *reduce_comb; /**< data combiner routine */
45   unsigned flags; /**< flags for additional info from compiler */
46 } red_input_t;
47 
48 void i_comb(void *lhs, void *rhs) { *(int *)lhs += *(int *)rhs; }
49 
50 int main() {
51   int var = INIT;
52   int *p_var_orig = &var;
53   omp_set_dynamic(0);
54   omp_set_num_threads(NT);
55 //  #pragma omp parallel reduction(task,+:var)
56 #pragma omp parallel reduction(+ : var) shared(p_var_orig)
57   {
58     int gtid = __kmpc_global_thread_num(NULL);
59     void *tg; // pointer to taskgroup (optional)
60     red_input_t r_var;
61     r_var.reduce_shar = &var;
62     r_var.reduce_orig =
63         p_var_orig; // not used in this test but illustrates codegen
64     r_var.reduce_size = sizeof(var);
65     r_var.reduce_init = NULL;
66     r_var.reduce_fini = NULL;
67     r_var.reduce_comb = (void *)&i_comb;
68     tg = __kmpc_taskred_modifier_init(
69         NULL, // ident_t loc;
70         gtid,
71         0, // 1 - worksharing construct, 0 - parallel
72         1, // number of reduction objects
73         &r_var // related data
74         );
75     var++;
76 #pragma omp task /*in_reduction(+:var)*/ shared(var)
77     {
78       int gtid = __kmpc_global_thread_num(NULL);
79       int *p_var = (int *)__kmpc_task_reduction_get_th_data(gtid, tg, &var);
80       *p_var += 1;
81     }
82     if (omp_get_thread_num() > 0) {
83 #pragma omp task /*in_reduction(+:var)*/ shared(var)
84       {
85         int gtid = __kmpc_global_thread_num(NULL);
86         int *p_var = (int *)__kmpc_task_reduction_get_th_data(gtid, tg, &var);
87         *p_var += 1;
88       }
89     }
90     __kmpc_task_reduction_modifier_fini(NULL, gtid, 0);
91   }
92   if (var == INIT + NT * 3 - 1) {
93     printf("passed\n");
94     return 0;
95   } else {
96     printf("failed: var = %d (!= %d)\n", var, INIT + NT * 3 - 1);
97     return 1;
98   }
99 }
100