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 // flags, 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
i_comb(void * lhs,void * rhs)48 void i_comb(void *lhs, void *rhs) { *(int *)lhs += *(int *)rhs; }
49
main()50 int main() {
51 int var = INIT;
52 int *p_var_orig = &var;
53 int i;
54 omp_set_dynamic(0);
55 omp_set_num_threads(NT);
56 #pragma omp parallel private(i) shared(p_var_orig)
57 // #pragma omp for reduction(task,+:var)
58 #pragma omp for reduction(+ : var)
59 for (i = 0; i < NT; ++i) // single iteration per thread
60 {
61 // generated code, which actually should be placed before
62 // loop iterations distribution, but placed here just to show the idea,
63 // and to keep correctness the loop count is equal to number of threads
64 int gtid = __kmpc_global_thread_num(NULL);
65 void *tg; // pointer to taskgroup (optional)
66 red_input_t r_var;
67 r_var.reduce_shar = &var;
68 r_var.reduce_orig =
69 p_var_orig; // not used in this test but illustrates codegen
70 r_var.reduce_size = sizeof(var);
71 r_var.reduce_init = NULL;
72 r_var.reduce_fini = NULL;
73 r_var.reduce_comb = (void *)&i_comb;
74 tg = __kmpc_taskred_modifier_init(
75 NULL, // ident_t loc;
76 gtid,
77 1, // 1 - worksharing construct, 0 - parallel
78 1, // number of reduction objects
79 &r_var // related data
80 );
81 // end of generated code
82 var++;
83 #pragma omp task /*in_reduction(+:var)*/ shared(var)
84 {
85 // emulate task reduction here because of compiler bug:
86 // it mistakenly declines to accept in_reduction because var is private
87 // outside.
88 int gtid = __kmpc_global_thread_num(NULL);
89 int *p_var = (int *)__kmpc_task_reduction_get_th_data(gtid, tg, &var);
90 *p_var += 1;
91 }
92 if (omp_get_thread_num() > 0) {
93 #pragma omp task /*in_reduction(+:var)*/ shared(var)
94 {
95 int gtid = __kmpc_global_thread_num(NULL);
96 int *p_var = (int *)__kmpc_task_reduction_get_th_data(gtid, tg, &var);
97 *p_var += 1;
98 }
99 }
100 // generated code, which actually should be placed after loop completion
101 // but before barrier and before loop reduction. It placed here just to show
102 // the idea,
103 // and to keep correctness the loop count is equal to number of threads
104 __kmpc_task_reduction_modifier_fini(NULL, gtid, 1);
105 // end of generated code
106 }
107 if (var == INIT + NT * 3 - 1) {
108 printf("passed\n");
109 return 0;
110 } else {
111 printf("failed: var = %d (!= %d)\n", var, INIT + NT * 3 - 1);
112 return 1;
113 }
114 }
115