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       half_recip,_native_recip - Floating point reciprocal.

       gentype half_recip(gentype x);

       gentype native_recip(gentype x);


       The half_recip computes reciprocal.

       native_recip computes reciprocal over an implementation-defined range. The maximum error
       is implementation-defined.


       This built-in math function takes scalar or vector arguments. The generic type name
       gentype is used to indicate that the function can take float, float2, float4, float8, or
       float16 as the type for the arguments. For any specific use of these function, the actual
       type has to be the same for all arguments and the return type.

       Functions with the half_ prefix are implemented with a minimum of 10-bits of accuracy i.e.
       an ULP value less than or equal to 8192 ulp.

       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.

       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.


       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
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       portions of the Materials.


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