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       half_divide,_native_divide - Division functions.

       gentype half_divide(gentype x, gentype y);

       gentype native_divide(gentype x, gentype y);


       half_divide computes x / y. This function is implemented with a minimum of 10-bits of
       accuracy i.e. an ULP value less than or equal to 8192 ulp.

       native_cos computes cosine over an implementation-defined range. The maximum error is

       The vector versions of the math functions operate component-wise. The description is

       The built-in math functions are not affected by the prevailing rounding mode in the
       calling environment, and always return the same value as they would if called with the
       round to nearest even rounding mode.

       For any specific use of a function, the actual type has to be the same for all arguments
       and the return type, unless otherwise specified.

       The functions with the native_ prefix may map to one or more native device instructions
       and will typically have better performance compared to the corresponding functions
       (without the native__ prefix). The accuracy (and in some cases the input range(s)) of
       these functions is implementation-defined.

       gentype indicates that the functions can take float, float2, float3, float4, float8 or
       float16 as the type for the arguments.


       OpenCL Specification[1]




       The Khronos Group


       Copyright © 2007-2011 The Khronos Group Inc.
       Permission is hereby granted, free of charge, to any person obtaining a copy of this
       software and/or associated documentation files (the "Materials"), to deal in the Materials
       without restriction, including without limitation the rights to use, copy, modify, merge,
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       portions of the Materials.


        1. OpenCL Specification
           page 244, section 6.12.2 - Math Functions