Archives Discussions

[akumar8]

Use of atomic_add for "int" work fine but, throws following error when used for "long int"

/tmp/OCLt2TJtm.cl(33): error: function "atom_add" declared implicitly

When any of the following line is include in the source code

#pragma OPENCL EXTENSION cl_khr_global_int64_base_atomics : enable
#pragma OPENCL EXTENSION cl_khr_int64_base_atomics : enable

new error of the form shown below is thrown

/tmp/OCLt2TJtm.cl(9): error: can't enable all OpenCL extensions or
          unrecognized OpenCL extension
  #pragma OPENCL EXTENSION cl_khr_int64_base_atomics : enable

I have installed APP-SDK-2.4 on 64-bit Ubuntu.

[MicahVillmow]

64bit atomics are not supported on the device you are attempting to compile for, so it is failing with an error.

[akumar8]

Thank you.

That means it is not possible to perform 64 bit atomics on any of the ATI Radeon HD 5xxx or 6xxx series devices. Please correct me if wrong. I have no idea about the devices.

[MicahVillmow]

These devices do not support 64bit atomics. You can query what a device supports with the OpenCL api with the clGetDeviceInfo query. I believe we also state this information in the programming guide.

[akumar8]

Thanks. Found it in the programming guide about 5xxx series.