GNU libgomp: acc_memcpy_from_device

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### 5.31 `acc_memcpy_from_device` – Copy device memory to host memory.

Description

  This function copies host memory specified by host address of src from device memory specified by the device address dest for a length of bytes bytes.

C/C++:

  Prototype: | `acc_memcpy_from_device(d_void *dest, h_void *src, size_t bytes);`

Reference:

  OpenACC specification v2.0, section 3.2.31.