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       cl_khr_int64_extended_atomics - Optional extensions that implement atomic operations on
       64-bit signed and unsigned integers to locations in __global and __local memory.

       #pragma OPENCL EXTENSION
       cl_khr_int64_extended_atomics : enable


       An application that wants to use this extension will need to include the #pragma OPENCL
       EXTENSION cl_khr_int64_extended_atomics : enable directive in the OpenCL program source.

       The atomic functions supported by the cl_khr_int64_extended_atomics extension are
       described in the following table. All of the functions listed in the following table are
       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
       w.r.t. each other.

       │FunctionDescription             │
       │atom_min(3clc) │ Compute min (old, val)  │
       │atom_max(3clc) │ Compute max (old, val)> │
       │atom_and(3clc) │ Compute (old & val)     │
       │atom_or(3clc)  │ Compute (old | val)     │
       │atom_xor(3clc) │ Compute (old ^ val)     │


       OpenCL Specification[1]


       EXTENSION(3clc), cl_khr_int64_base_atomics(3clc), atomicFunctions(3clc)


       The Khronos Group


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       Permission is hereby granted, free of charge, to any person obtaining a copy of this
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        1. OpenCL Specification
           page 10, section 9.3 - 64-bit Atomics