NAME

       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
       unsigned long. 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 unsigned long. 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)  │                │
       └────────────────┴────────────────┴────────────────┘

DESCRIPTION

       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 OpenCL Extension
       Specification[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.

SPECIFICATION

       OpenCL Specification[2]

AUTHORS

       The Khronos Group

COPYRIGHT

       Copyright © 2007-2011 The Khronos Group Inc.
       Permission is hereby granted, free of charge, to any person obtaining a copy of this software and/or
       associated documentation files (the "Materials"), to deal in the Materials without restriction, including
       without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
       copies of the Materials, and to permit persons to whom the Materials are furnished to do so, subject to
       the condition that this copyright notice and permission notice shall be included in all copies or
       substantial portions of the Materials.

NOTES

        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                                  01/14/2021                             ATOMIC FUNCTIONS(3clc)