Optional extensions that implement atomic operations
on 64bit signed and unsigned integers to locations in __global
and __local
memory.
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 

Read the 64bit 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
long 
Read the 64bit 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
long 
Read the 64bit 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
long 
Read the 64bit 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
long 
Read the 64bit 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 .
