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

Description

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.

Function Description


long atom_min (__global long *p, long val)

long atom_min (__local long *p, long val)

ulong atom_min (__global ulong *p, ulong val)

ulong atom_min (__local ulong *p, ulong val)

 Read the 64-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.

long atom_max (__global long *p, long val)

long atom_max (__local long *p, long val)

ulong atom_max (__global ulong *p, ulong val)

ulong atom_max (__local ulong *p, ulong val)

Read the 64-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.

long atom_and (__global long *p, long val)

long atom_and (__local long *p, long val)

ulong atom_and (__global ulong *p, ulong val)

ulong atom_and (__local ulong *p, ulong val)

Read the 64-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.

long atom_or (__global long *p, long val)

long atom_or (__local long *p, long val)

ulong atom_or (__global ulong *p, ulong val)

ulong atom_or (__local ulong *p, ulong val)

Read the 64-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.

long atom_xor (__global long *p, long val)

long atom_xor (__local long *p, long val)

ulong atom_xor (__global ulong *p, ulong val)

ulong atom_xor (__local ulong *p, ulong val)

Read the 64-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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