exp2_horner() [1/2]

template<typename Derived, int IntBits, int FracBits>

template<typename PolyType>

static FASTLED_FORCE_INLINE Derived fl::fixed_point_base< Derived, IntBits, FracBits >::exp2_horner ( raw_type int_pow, PolyType fr_ifrac, PolyType d0, PolyType d1, PolyType d2, PolyType d3, fl::false_type  )

inlinestaticprivate

Definition at line 458 of file base.h.

                                                                   {
        constexpr int IFRAC = traits::IFRAC;
        constexpr PolyType one_ifrac = static_cast<PolyType>(1) << IFRAC;
        PolyType acc = d3;
        acc = d2 + ((acc * fr_ifrac) >> IFRAC);
        acc = d1 + ((acc * fr_ifrac) >> IFRAC);
        acc = d0 + ((acc * fr_ifrac) >> IFRAC);
        PolyType frac_pow_ifrac = one_ifrac + ((acc * fr_ifrac) >> IFRAC);
        raw_type frac_pow = static_cast<raw_type>(frac_pow_ifrac >> (IFRAC - FRAC_BITS));
        intermediate_type result = (static_cast<intermediate_type>(int_pow) * frac_pow) >> FRAC_BITS;
        return Derived::from_raw(static_cast<raw_type>(result));
    }

References FASTLED_FORCE_INLINE, FRAC_BITS, and fl::fixed_point_traits< IntBits, FracBits >::IFRAC.