cl_khr_int64_base_atomics3clc
Optional extensions that implement atomic operations on 64-bit signed and unsigned integers to locations in __global and __local memory.
Overview
An application that wants to use this extension will need to include the #pragma OPENCL EXTENSION cl_khr_int64_base_atomics : enable directive in the OpenCL program source.
The atomic functions supported by the cl_khr_int64_base_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.
Atomic operations on 64-bit integers and 32-bit integers (and float) are also atomic w.r.t. each other.
| Function | Description |
| atom_add(3clc) | Compute (old + val) |
| atom_sub(3clc) | Compute (old - val) |
| atom_xchg(3clc) | Swaps the 32-bit value (old) stored at location p with new value val. |
| atom_inc(3clc) | Compute (old + 1) |
| atom_dec(3clc) | Compute (old - 1) |
| atom_cmpxchg(3clc) | Compute (old == cmp) ? val : old |
Specification
OpenCL Specification[1]
Notes
- 1.
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OpenCL Specification
page 10, section 9.3 - 64-bit Atomics
Releases
5 releases since Debian 8 (Jessie); the text changed 3 times.