cl_khr_global_int32_extended_atomics

Optional extensions that implement atomic operations on 32-bit signed and unsigned integers to locations in __global memory.

#pragma OPENCL EXTENSION cl_khr_global_int32_extended_atomics : enable

Description

An application that wants to use this extension will need to include the #pragma OPENCL EXTENSION cl_khr_global_int32_extended_atomics : enable directive in the OpenCL program source.

The atomic functions supported by the cl_khr_global_int32_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.

Function Description

int atom_min (__global int *p, int val)

unsigned int atom_min (__global unsigned int *p,
         unsigned int val)

Read the 32-bit value (referred to as old) stored at location pointed by p. Compute min(old, val) and store minimum value at location pointed by p. The function returns old.

int atom_max (__global int *p, int val)

unsigned int atom_max (__global unsigned int *p,
         unsigned int val)

Read the 32-bit value (referred to as old) stored at location pointed by p. Compute max(old, val) and store maximum value at location pointed by p. The function returns old.

int atom_and (__global int *p, int val)

unsigned int atom_and (__global unsigned int *p,
         unsigned int val)

Read the 32-bit value (referred to as old) stored at location p. Compute (old & val) and store result at location pointed to by p. The function returns old.

int atom_or (__global int *p, int val)

unsigned int atom_or (__global unsigned int *p,
         unsigned int val)

Read the 32-bit value (referred to as old) stored at location p. Compute (old | val) and store result at location pointed to by p. The function returns old.

int atom_xor (__global int *p, int val)

unsigned int atom_xor (__global unsigned int *p,
         unsigned int val)

Read the 32-bit value (referred to as old) stored at location p. Compute (old ^ val) and store result at location pointed to by p. The function returns old.

Specification

OpenCL Specification

Also see

EXTENSION

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