atom_or
atom_or
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3
atom_or 64-bit atom_or functions.

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long `atom_or` volatile __global long*p long val long `atom_or` volatile __local long*p long val ulong `atom_or` volatile __global ulong*p ulong val ulong `atom_or` volatile __local ulong*p ulong val

## Description

Read the 64-bit value (referred to as `old`) stored at location pointed by `p`. Compute (`old` | `val`) and store result at location pointed by `p`. The function returns `old`.

An application that wants to use this extension will need to include the `#pragma OPENCL EXTENSION cl_khr_int64_extended_atomics : enable` in the OpenCL program source.

This function is 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 with regard to each other.

## Specification

OpenCL Specification

## Also see

Atomic Functions, atomic_or, cl_khr_int64_extended_atomics

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