Atomic_Functions - The atomic functions are shown below. Click an item in the table below for details

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       These functions provide atomic operations on 32-bit signed, unsigned integers and single precision
       floating-point to locations in global(3clc) or local(3clc) memory. Only the atomic_xchg operation is
       supported for single precision floating-point data type.

       The atomic built-in functions that use the atom_ prefix and are described in the OpenCLExtensionSpecification[1] and are enabled by: cl_khr_global_int32_base_atomics,
       cl_khr_global_int32_extended_atomics, cl_khr_local_int32_base_atomics, and
       cl_khr_local_int32_extended_atomics in sections 9.5 and 9.6 of the OpenCL 1.0 specification are also
       supported. .

       The 64-bit 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_Functions - The atomic functions are shown below. Click an item in the table below for details
       about that function.

       ┌──────────────────┬──────────────────────┬───────────────────┬──────────────────┐
       │ atomic_add(3clc) │ atomic_sub(3clc)     │ atomic_xchg(3clc) │ atomic_inc(3clc) │
       ├──────────────────┼──────────────────────┼───────────────────┼──────────────────┤
       │ atomic_dec(3clc) │ atomic_cmpxchg(3clc) │ atomic_min(3clc)  │ atomic_max(3clc) │
       ├──────────────────┼──────────────────────┼───────────────────┼──────────────────┤
       │ atomic_and(3clc) │ atomic_or(3clc)      │ atomic_xor(3clc)  │                  │
       └──────────────────┴──────────────────────┴───────────────────┴──────────────────┘

       The cl_khr_int64_base_atomics(3clc) extension enables additional atomic functions using types long and
       unsignedlong. An application that wants to use this extension will need to include the #pragma OPENCL
       EXTENSION cl_khr_int64_base_atomics(3clc) : enable in the OpenCL program source.
       ┌────────────────┬────────────────────┬─────────────────┬────────────────┐
       │ atom_add(3clc) │ atom_sub(3clc)     │ atom_xchg(3clc) │ atom_inc(3clc) │
       ├────────────────┼────────────────────┼─────────────────┼────────────────┤
       │ atom_dec(3clc) │ atom_cmpxchg(3clc) │                 │                │
       └────────────────┴────────────────────┴─────────────────┴────────────────┘

       The cl_khr_int64_extended_atomics(3clc) extension enables additional atomic functions using types long
       and unsignedlong. An application that wants to use this extension will need to include the #pragma
       OPENCL EXTENSION cl_khr_int64_extended_atomics(3clc) : enable in the OpenCL program source.
       ┌────────────────┬────────────────┬────────────────┐
       │ atom_min(3clc) │ atom_max(3clc) │ atom_xor(3clc) │
       ├────────────────┼────────────────┼────────────────┤
       │ atom_and(3clc) │ atom_or(3clc)  │                │
       └────────────────┴────────────────┴────────────────┘

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

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

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

OpenCLSpecification[2]