trigonometric.h

/*  This file is part of the Vc library. {{{
Copyright © 2009-2015 Matthias Kretz <kretz@kde.org>

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the names of contributing organizations nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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}}}*/

#ifndef VC_COMMON_TRIGONOMETRIC_H_
#define VC_COMMON_TRIGONOMETRIC_H_

#include "macros.h"

#ifdef Vc_HAVE_LIBMVEC
extern "C" {
__m128 _ZGVbN4v_sinf(__m128);
__m128d _ZGVbN2v_sin(__m128d);
__m128 _ZGVbN4v_cosf(__m128);
__m128d _ZGVbN2v_cos(__m128d);
__m256 _ZGVdN8v_sinf(__m256);
__m256d _ZGVdN4v_sin(__m256d);
__m256 _ZGVdN8v_cosf(__m256);
__m256d _ZGVdN4v_cos(__m256d);
}
#endif

namespace Vc_VERSIONED_NAMESPACE
{
namespace Detail
{
template<Vc::Implementation Impl> struct MapImpl { enum Dummy { Value = Impl }; };
template<> struct MapImpl<Vc::SSE42Impl> { enum Dummy { Value = MapImpl<Vc::SSE41Impl>::Value }; };

template<Vc::Implementation Impl> using TrigonometricImplementation =
    ImplementationT<MapImpl<Impl>::Value
#if defined(Vc_IMPL_XOP) && defined(Vc_IMPL_FMA4)
    + Vc::XopInstructions
    + Vc::Fma4Instructions
#endif
    >;
}  // namespace Detail

namespace Common
{
template<typename Impl> struct Trigonometric
{
    template<typename T> static T sin(const T &_x);
    template<typename T> static T cos(const T &_x);
    template<typename T> static void sincos(const T &_x, T *_sin, T *_cos);
    template<typename T> static T asin (const T &_x);
    template<typename T> static T atan (const T &_x);
    template<typename T> static T atan2(const T &y, const T &x);
};
}  // namespace Common

#if defined Vc_IMPL_SSE || defined DOXYGEN
// this is either SSE, AVX, or AVX2
namespace Detail
{
template <typename T, typename Abi>
using Trig = Common::Trigonometric<Detail::TrigonometricImplementation<
    (std::is_same<Abi, VectorAbi::Sse>::value
         ? SSE42Impl
         : std::is_same<Abi, VectorAbi::Avx>::value ? AVXImpl : ScalarImpl)>>;
}  // namespace Detail

#ifdef Vc_HAVE_LIBMVEC
Vc_INTRINSIC __m128  sin_dispatch(__m128  x) { return ::_ZGVbN4v_sinf(x); }
Vc_INTRINSIC __m128d sin_dispatch(__m128d x) { return ::_ZGVbN2v_sin (x); }
Vc_INTRINSIC __m128  cos_dispatch(__m128  x) { return ::_ZGVbN4v_cosf(x); }
Vc_INTRINSIC __m128d cos_dispatch(__m128d x) { return ::_ZGVbN2v_cos (x); }
#ifdef Vc_IMPL_AVX
Vc_INTRINSIC __m256  sin_dispatch(__m256  x) { return ::_ZGVdN8v_sinf(x); }
Vc_INTRINSIC __m256d sin_dispatch(__m256d x) { return ::_ZGVdN4v_sin (x); }
Vc_INTRINSIC __m256  cos_dispatch(__m256  x) { return ::_ZGVdN8v_cosf(x); }
Vc_INTRINSIC __m256d cos_dispatch(__m256d x) { return ::_ZGVdN4v_cos (x); }
#endif

template <typename T, typename Abi>
Vc_INTRINSIC Vector<T, detail::not_fixed_size_abi<Abi>> sin(const Vector<T, Abi> &x)
{
    return sin_dispatch(x.data());
}
template <typename T, typename Abi>
Vc_INTRINSIC Vector<T, detail::not_fixed_size_abi<Abi>> cos(const Vector<T, Abi> &x)
{
    return cos_dispatch(x.data());
}
#else

template <typename T, typename Abi>
Vc_INTRINSIC Vector<T, detail::not_fixed_size_abi<Abi>> sin(const Vector<T, Abi> &x)
{
    return Detail::Trig<T, Abi>::sin(x);
}

template <typename T, typename Abi>
Vc_INTRINSIC Vector<T, detail::not_fixed_size_abi<Abi>> cos(const Vector<T, Abi> &x)
{
    return Detail::Trig<T, Abi>::cos(x);
}
#endif

template <typename T, typename Abi>
Vc_INTRINSIC Vector<T, detail::not_fixed_size_abi<Abi>> asin(const Vector<T, Abi> &x)
{
    return Detail::Trig<T, Abi>::asin(x);
}

template <typename T, typename Abi>
Vc_INTRINSIC Vector<T, detail::not_fixed_size_abi<Abi>> atan(const Vector<T, Abi> &x)
{
    return Detail::Trig<T, Abi>::atan(x);
}

template <typename T, typename Abi>
Vc_INTRINSIC Vector<T, detail::not_fixed_size_abi<Abi>> atan2(const Vector<T, Abi> &y,
                                                              const Vector<T, Abi> &x)
{
    return Detail::Trig<T, Abi>::atan2(y, x);
}

template <typename T, typename Abi>
Vc_INTRINSIC void sincos(const Vector<T, Abi> &x,
                         Vector<T, detail::not_fixed_size_abi<Abi>> *sin,
                         Vector<T, Abi> *cos)
{
    Detail::Trig<T, Abi>::sincos(x, sin, cos);
}
#endif
}  // namespace Vc_VERSIONED_NAMESPACE

#endif  // VC_COMMON_TRIGONOMETRIC_H_