| // RUN: %libomptarget-compile-run-and-check-generic |
| |
| // REQUIRES: unified_shared_memory |
| // UNSUPPORTED: clang-6, clang-7, clang-8, clang-9 |
| |
| #include <assert.h> |
| #include <omp.h> |
| #include <stdio.h> |
| |
| #pragma omp requires unified_shared_memory |
| |
| int main(int argc, char *argv[]) { |
| int dev = omp_get_default_device(); |
| int x = 10; |
| int *x_dev = (int *)omp_target_alloc(sizeof x, dev); |
| assert(x_dev && "expected omp_target_alloc to succeed"); |
| int rc = omp_target_associate_ptr(&x, x_dev, sizeof x, 0, dev); |
| assert(!rc && "expected omp_target_associate_ptr to succeed"); |
| |
| // To determine whether x needs to be transfered, the runtime cannot simply |
| // check whether unified shared memory is enabled and the 'close' modifier is |
| // specified. It must check whether x was previously placed in device memory |
| // by, for example, omp_target_associate_ptr. |
| #pragma omp target map(always, tofrom : x) |
| x += 1; |
| |
| // CHECK: x=11 |
| printf("x=%d\n", x); |
| // CHECK: present: 1 |
| printf("present: %d\n", omp_target_is_present(&x, dev)); |
| |
| return 0; |
| } |