cl_khr_int64_base_atomics - Optional extensions that implement atomic operations on 64-bit signed and

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       An application that wants to use this extension will need to include the #pragmaOPENCLEXTENSIONcl_khr_int64_base_atomics:enable directive in the OpenCL program source.

       The atomic functions supported by the cl_khr_int64_base_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.
       ┌────────────────────┬─────────────────────────────────────┐
       │ Function           │ Description                         │
       ├────────────────────┼─────────────────────────────────────┤
       │ atom_add(3clc)     │ Compute (old + val)                 │
       ├────────────────────┼─────────────────────────────────────┤
       │ atom_sub(3clc)     │ Compute (old - val)                 │
       ├────────────────────┼─────────────────────────────────────┤
       │ atom_xchg(3clc)    │ Swaps the 32-bit value (old) stored │
       │                    │ at location p with new value val.   │
       ├────────────────────┼─────────────────────────────────────┤
       │ atom_inc(3clc)     │ Compute (old + 1)                   │
       ├────────────────────┼─────────────────────────────────────┤
       │ atom_dec(3clc)     │ Compute (old - 1)                   │
       ├────────────────────┼─────────────────────────────────────┤
       │ atom_cmpxchg(3clc) │ Compute (old == cmp) ? val : old    │
       └────────────────────┴─────────────────────────────────────┘

       cl_khr_int64_base_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_base_atomics :
       enable

        1. OpenCL Specification
           page 10, section 9.3 - 64-bit Atomics

The Khronos Group                                  11/18/2024                         CL_KHR_INT64_BASE_AT(3clc)

EXTENSION(3clc), cl_khr_int64_extended_atomics(3clc), atomicFunctions(3clc)

OpenCLSpecification[1]