atom_add - 64-bit atom_add functions.

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       Read the 64-bit value (referred to as old) stored at location pointed by p. Compute (old + val) and store
       result at location pointed by p. The function returns old.

       An application that wants to use this extension will need to include the #pragma OPENCL EXTENSION
       cl_khr_int64_base_atomics : enable in the OpenCL program source.

       This function is performed in one atomic transaction. These transactions are atomic for the device
       executing these atomic functions. There is no guarantee of atomicity if the atomic operations to the same
       memory location are being performed by kernels executing on multiple devices.

       Atomic operations on 64-bit integers and 32-bit integers (and float) are also atomic with regard to each
       other.

       atom_add - 64-bit atom_add functions.

       longatom_add(volatileglobal(3clc) long *p,longval);longatom_add(volatileglobal(3clc) long *p,longval);ulongatom_add(volatilelocal(3clc) ulong *p,ulongval);ulongatom_add(volatilelocal(3clc) ulong *p,ulongval);

        1. OpenCL Specification
           page 279, section 6.12.11 - Atomic Functions for 32-bit integers

The Khronos Group                                  11/18/2024                                     ATOM_ADD(3clc)

atomicFunctions(3clc), atomic_add(3clc), cl_khr_int64_base_atomics(3clc)

OpenCLSpecification[1]