1// RUN: %libomptarget-compile-run-and-check-generic
2
3#include <cstdio>
4#include <cstdlib>
5
6#define NUM 1024
7
8class C {
9public:
10 int *a;
11};
12
13#pragma omp declare mapper(id : C s) map(s.a[0 : NUM])
14
15int main() {
16 C c;
17 int sum = 0;
18 c.a = (int *)malloc(size: sizeof(int) * NUM);
19 for (int i = 0; i < NUM; i++) {
20 c.a[i] = 1;
21 }
22#pragma omp target enter data map(mapper(id), alloc : c)
23#pragma omp target teams distribute parallel for
24 for (int i = 0; i < NUM; i++) {
25 c.a[i] = 0;
26 }
27#pragma omp target update from(mapper(id) : c)
28 for (int i = 0; i < NUM; i++) {
29 sum += c.a[i];
30 }
31 // CHECK: Sum (after first update from) = 0
32 printf(format: "Sum (after first update from) = %d\n", sum);
33 for (int i = 0; i < NUM; i++) {
34 c.a[i] = 1;
35 }
36#pragma omp target update to(mapper(id) : c)
37#pragma omp target teams distribute parallel for
38 for (int i = 0; i < NUM; i++) {
39 ++c.a[i];
40 }
41 sum = 0;
42 for (int i = 0; i < NUM; i++) {
43 sum += c.a[i];
44 }
45 // CHECK: Sum (after update to) = 1024
46 printf(format: "Sum (after update to) = %d\n", sum);
47#pragma omp target update from(mapper(id) : c)
48 sum = 0;
49 for (int i = 0; i < NUM; i++) {
50 sum += c.a[i];
51 }
52 // CHECK: Sum (after second update from) = 2048
53 printf(format: "Sum (after second update from) = %d\n", sum);
54#pragma omp target exit data map(mapper(id), delete : c)
55 return 0;
56}
57

source code of offload/test/mapping/declare_mapper_target_update.cpp