cl_khr_fp64 - Provided for backward compatibility if double floating-point precision is supported.

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       The 64-bit double scalar and corresponding vector types are optional types that are supported if
       CL_DEVICE_DOUBLE_FP_CONFIG in the table of allowed values for param_name for clGetDeviceInfo(3clc) for a
       device is not zero.

       The double data type must confirm to the IEEE-754 double precision storage format.

       cl_khr_fp64 - Provided for backward compatibility if double floating-point precision is supported.

       #pragma OPENCL EXTENSION cl_khr_fp64 : enable

        1. OpenCL Specification
           page 46, section 4.2 - Querying Devices

The Khronos Group                                  11/18/2024                                  CL_KHR_FP64(3clc)

clGetDeviceInfo(3clc)

OpenCLSpecification[1]