acc_present_or_copyin– If the data is not present on the device, allocate device memory and copy from host memory.
This function tests if the host data specified by a and of length len is present or not. If it is not present, then device memory will be allocated and the host memory copied. The device address of the newly allocated device memory is returned.
In Fortran, two (2) forms are supported. In the first form, a specifies a contiguous array section. The second form a specifies a variable or array element and len specifies the length in bytes.
acc_pcopyin exist for
backward compatibility with OpenACC 2.0; use
acc_copyin – Allocate device memory and copy host memory to it. instead.
OpenACC specification v2.6, section 3.2.20.