// Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2009 Rohit Garg <rpg.314@gmail.com>
// Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef EIGEN_GEOMETRY_SSE_H
#define EIGEN_GEOMETRY_SSE_H

namespace Eigen {

namespace internal {

template <class Derived, class OtherDerived>
struct quat_product<Architecture::SSE, Derived, OtherDerived, float> {
  enum {
    AAlignment = traits<Derived>::Alignment,
    BAlignment = traits<OtherDerived>::Alignment,
    ResAlignment = traits<Quaternion<float>>::Alignment
  };
  static inline Quaternion<float> run(const QuaternionBase<Derived>& _a,
                                      const QuaternionBase<OtherDerived>& _b) {
    evaluator<typename Derived::Coefficients> ae(_a.coeffs());
    evaluator<typename OtherDerived::Coefficients> be(_b.coeffs());
    Quaternion<float> res;
    const __m128 mask = _mm_setr_ps(0.f, 0.f, 0.f, -0.f);
    __m128 a = ae.template packet<AAlignment, __m128>(0);
    __m128 b = be.template packet<BAlignment, __m128>(0);
    __m128 s1 =
        pmul(vec4f_swizzle1(a, 1, 2, 0, 2), vec4f_swizzle1(b, 2, 0, 1, 2));
    __m128 s2 =
        pmul(vec4f_swizzle1(a, 3, 3, 3, 1), vec4f_swizzle1(b, 0, 1, 2, 1));
    pstoret<float, __m128, ResAlignment>(
        &res.x(),
        padd(psub(pmul(a, vec4f_swizzle1(b, 3, 3, 3, 3)),
                  pmul(vec4f_swizzle1(a, 2, 0, 1, 0),
                       vec4f_swizzle1(b, 1, 2, 0, 0))),
             pxor(mask, padd(s1, s2))));

    return res;
  }
};

template <class Derived>
struct quat_conj<Architecture::SSE, Derived, float> {
  enum { ResAlignment = traits<Quaternion<float>>::Alignment };
  static inline Quaternion<float> run(const QuaternionBase<Derived>& q) {
    evaluator<typename Derived::Coefficients> qe(q.coeffs());
    Quaternion<float> res;
    const Packet4f mask = _mm_setr_ps(-0.f, -0.f, -0.f, 0.f);
    pstoret<float, Packet4f, ResAlignment>(
        &res.x(),
        pxor(mask,
             qe.template packet<traits<Derived>::Alignment, Packet4f>(0)));
    return res;
  }
};

template <typename VectorLhs, typename VectorRhs>
struct cross3_impl<Architecture::SSE, VectorLhs, VectorRhs, float, true> {
  enum {
    ResAlignment =
        traits<typename plain_matrix_type<VectorLhs>::type>::Alignment
  };
  static inline typename plain_matrix_type<VectorLhs>::type run(
      const VectorLhs& lhs, const VectorRhs& rhs) {
    evaluator<VectorLhs> lhs_eval(lhs);
    evaluator<VectorRhs> rhs_eval(rhs);
    __m128 a =
        lhs_eval.template packet<traits<VectorLhs>::Alignment, __m128>(0);
    __m128 b =
        rhs_eval.template packet<traits<VectorRhs>::Alignment, __m128>(0);
    __m128 mul1 =
        pmul(vec4f_swizzle1(a, 1, 2, 0, 3), vec4f_swizzle1(b, 2, 0, 1, 3));
    __m128 mul2 =
        pmul(vec4f_swizzle1(a, 2, 0, 1, 3), vec4f_swizzle1(b, 1, 2, 0, 3));
    typename plain_matrix_type<VectorLhs>::type res;
    pstoret<float, __m128, ResAlignment>(&res.x(), psub(mul1, mul2));
    return res;
  }
};

template <class Derived, class OtherDerived>
struct quat_product<Architecture::SSE, Derived, OtherDerived, double> {
  enum {
    BAlignment = traits<OtherDerived>::Alignment,
    ResAlignment = traits<Quaternion<double>>::Alignment
  };

  static inline Quaternion<double> run(const QuaternionBase<Derived>& _a,
                                       const QuaternionBase<OtherDerived>& _b) {
    const Packet2d mask =
        _mm_castsi128_pd(_mm_set_epi32(0x0, 0x0, 0x80000000, 0x0));

    Quaternion<double> res;

    evaluator<typename Derived::Coefficients> ae(_a.coeffs());
    evaluator<typename OtherDerived::Coefficients> be(_b.coeffs());

    const double* a = _a.coeffs().data();
    Packet2d b_xy = be.template packet<BAlignment, Packet2d>(0);
    Packet2d b_zw = be.template packet<BAlignment, Packet2d>(2);
    Packet2d a_xx = pset1<Packet2d>(a[0]);
    Packet2d a_yy = pset1<Packet2d>(a[1]);
    Packet2d a_zz = pset1<Packet2d>(a[2]);
    Packet2d a_ww = pset1<Packet2d>(a[3]);

    // two temporaries:
    Packet2d t1, t2;

    /*
     * t1 = ww*xy + yy*zw
     * t2 = zz*xy - xx*zw
     * res.xy = t1 +/- swap(t2)
     */
    t1 = padd(pmul(a_ww, b_xy), pmul(a_yy, b_zw));
    t2 = psub(pmul(a_zz, b_xy), pmul(a_xx, b_zw));
#ifdef EIGEN_VECTORIZE_SSE3
    EIGEN_UNUSED_VARIABLE(mask)
    pstoret<double, Packet2d, ResAlignment>(&res.x(),
                                            _mm_addsub_pd(t1, preverse(t2)));
#else
    pstoret<double, Packet2d, ResAlignment>(&res.x(),
                                            padd(t1, pxor(mask, preverse(t2))));
#endif

    /*
     * t1 = ww*zw - yy*xy
     * t2 = zz*zw + xx*xy
     * res.zw = t1 -/+ swap(t2) = swap( swap(t1) +/- t2)
     */
    t1 = psub(pmul(a_ww, b_zw), pmul(a_yy, b_xy));
    t2 = padd(pmul(a_zz, b_zw), pmul(a_xx, b_xy));
#ifdef EIGEN_VECTORIZE_SSE3
    EIGEN_UNUSED_VARIABLE(mask)
    pstoret<double, Packet2d, ResAlignment>(
        &res.z(), preverse(_mm_addsub_pd(preverse(t1), t2)));
#else
    pstoret<double, Packet2d, ResAlignment>(&res.z(),
                                            psub(t1, pxor(mask, preverse(t2))));
#endif

    return res;
  }
};

template <class Derived>
struct quat_conj<Architecture::SSE, Derived, double> {
  enum { ResAlignment = traits<Quaternion<double>>::Alignment };
  static inline Quaternion<double> run(const QuaternionBase<Derived>& q) {
    evaluator<typename Derived::Coefficients> qe(q.coeffs());
    Quaternion<double> res;
    const Packet2d mask0 = _mm_setr_pd(-0., -0.);
    const Packet2d mask2 = _mm_setr_pd(-0., 0.);
    pstoret<double, Packet2d, ResAlignment>(
        &res.x(),
        pxor(mask0,
             qe.template packet<traits<Derived>::Alignment, Packet2d>(0)));
    pstoret<double, Packet2d, ResAlignment>(
        &res.z(),
        pxor(mask2,
             qe.template packet<traits<Derived>::Alignment, Packet2d>(2)));
    return res;
  }
};

}  // end namespace internal

}  // end namespace Eigen

#endif  // EIGEN_GEOMETRY_SSE_H