    // Copyright (C) 2013  Davis E. King (davis@dlib.net)
    // License: Boost Software License   See LICENSE.txt for the full license.
    #ifndef DLIB_sIMD8F_H__
    #define DLIB_sIMD8F_H__

    #include "simd_check.h"
    #include "simd4f.h"
    #include "simd8i.h"

    namespace dlib
    {
    #ifdef DLIB_HAVE_AVX
        class simd8f
        {
        public:
            typedef float type;

            inline simd8f() {}
            inline simd8f(const simd4f& low, const simd4f& high)
            {
                x = _mm256_insertf128_ps(_mm256_castps128_ps256(low),high,1);
            }
            inline simd8f(float f) { x = _mm256_set1_ps(f); }
            inline simd8f(float r0, float r1, float r2, float r3, float r4, float r5, float r6, float r7)
            { x = _mm256_setr_ps(r0,r1,r2,r3,r4,r5,r6,r7); }

            inline simd8f(const simd8i& val):x(_mm256_cvtepi32_ps(val)) {}
            inline simd8f(const __m256& val):x(val) {}
            inline simd8f& operator=(const __m256& val)
            {
                x = val;
                return *this;
            }
            inline operator __m256() const { return x; }

            // truncate to 32bit integers
            inline operator __m256i() const { return _mm256_cvttps_epi32(x); }

            inline void load_aligned(const type* ptr)  { x = _mm256_load_ps(ptr); }
            inline void store_aligned(type* ptr) const { _mm256_store_ps(ptr, x); }
            inline void load(const type* ptr)          { x = _mm256_loadu_ps(ptr); }
            inline void store(type* ptr)         const { _mm256_storeu_ps(ptr, x); }

            inline unsigned int size() const { return 8; }
            inline float operator[](unsigned int idx) const
            {
                float temp[8];
                store(temp);
                return temp[idx];
            }

            inline simd4f low() const { return _mm256_castps256_ps128(x); }
            inline simd4f high() const { return _mm256_extractf128_ps(x,1); }

        private:
            __m256 x;
        };

        class simd8f_bool
        {
        public:
            typedef float type;

            inline simd8f_bool() {}
            inline simd8f_bool(const __m256& val):x(val) {}
            inline simd8f_bool(const simd4f_bool& low, const simd4f_bool& high)
            {
                x = _mm256_insertf128_ps(_mm256_castps128_ps256(low),high,1);
            }

            inline simd8f_bool& operator=(const __m256& val)
            {
                x = val;
                return *this;
            }

            inline operator __m256() const { return x; }

        private:
            __m256 x;
        };

    #else
        class simd8f
        {
        public:
            typedef float type;

            inline simd8f() {}
            inline simd8f(const simd4f& low_, const simd4f& high_): _low(low_),_high(high_){}
            inline simd8f(float f) :_low(f),_high(f) {}
            inline simd8f(float r0, float r1, float r2, float r3, float r4, float r5, float r6, float r7) :
                _low(r0,r1,r2,r3), _high(r4,r5,r6,r7) {}
            inline simd8f(const simd8i& val) : _low(val.low()), _high(val.high()) { }

            // truncate to 32bit integers
            inline operator simd8i::rawarray() const
            {
                simd8i::rawarray temp;
                temp.low = simd4i(_low);
                temp.high = simd4i(_high);
                return temp;
            }

            inline void load_aligned(const type* ptr)  { _low.load_aligned(ptr); _high.load_aligned(ptr+4); }
            inline void store_aligned(type* ptr) const { _low.store_aligned(ptr); _high.store_aligned(ptr+4); }
            inline void load(const type* ptr)          { _low.load(ptr); _high.load(ptr+4); }
            inline void store(type* ptr)         const { _low.store(ptr); _high.store(ptr+4); }

            inline unsigned int size() const { return 8; }
            inline float operator[](unsigned int idx) const
            {
                if (idx < 4)
                    return _low[idx];
                else
                    return _high[idx-4];
            }

            inline simd4f low() const { return _low; }
            inline simd4f high() const { return _high; }

        private:
            simd4f _low, _high;
        };

        class simd8f_bool
        {
        public:
            typedef float type;

            inline simd8f_bool() {}
            inline simd8f_bool(const simd4f_bool& low_, const simd4f_bool& high_): _low(low_),_high(high_){}

            inline simd4f_bool low() const { return _low; }
            inline simd4f_bool high() const { return _high; }
        private:
            simd4f_bool _low,_high;
        };
    #endif

    // ----------------------------------------------------------------------------------------

        inline std::ostream& operator<<(std::ostream& out, const simd8f& item)
        {
            float temp[8];
            item.store(temp);
            out << "(" << temp[0] << ", " << temp[1] << ", " << temp[2] << ", " << temp[3] << ", "
                       << temp[4] << ", " << temp[5] << ", " << temp[6] << ", " << temp[7] << ")";
            return out;
        }

    // ----------------------------------------------------------------------------------------

        inline simd8f operator+ (const simd8f& lhs, const simd8f& rhs)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_add_ps(lhs, rhs);
    #else
            return simd8f(lhs.low()+rhs.low(),
                          lhs.high()+rhs.high());
    #endif
        }
        inline simd8f& operator+= (simd8f& lhs, const simd8f& rhs)
        { return lhs = lhs + rhs; return lhs;}

    // ----------------------------------------------------------------------------------------

        inline simd8f operator- (const simd8f& lhs, const simd8f& rhs)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_sub_ps(lhs, rhs);
    #else
            return simd8f(lhs.low()-rhs.low(),
                          lhs.high()-rhs.high());
    #endif
        }
        inline simd8f& operator-= (simd8f& lhs, const simd8f& rhs)
        { return lhs = lhs - rhs; return lhs;}

    // ----------------------------------------------------------------------------------------

        inline simd8f operator* (const simd8f& lhs, const simd8f& rhs)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_mul_ps(lhs, rhs);
    #else
            return simd8f(lhs.low()*rhs.low(),
                          lhs.high()*rhs.high());
    #endif
        }
        inline simd8f& operator*= (simd8f& lhs, const simd8f& rhs)
        { return lhs = lhs * rhs; return lhs;}

    // ----------------------------------------------------------------------------------------

        inline simd8f operator/ (const simd8f& lhs, const simd8f& rhs)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_div_ps(lhs, rhs);
    #else
            return simd8f(lhs.low()/rhs.low(),
                          lhs.high()/rhs.high());
    #endif
        }
        inline simd8f& operator/= (simd8f& lhs, const simd8f& rhs)
        { return lhs = lhs / rhs; return lhs;}

    // ----------------------------------------------------------------------------------------

        inline simd8f_bool operator== (const simd8f& lhs, const simd8f& rhs)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_cmp_ps(lhs, rhs, 0);
    #else
            return simd8f_bool(lhs.low() ==rhs.low(),
                          lhs.high()==rhs.high());
    #endif
        }

    // ----------------------------------------------------------------------------------------

        inline simd8f_bool operator!= (const simd8f& lhs, const simd8f& rhs)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_cmp_ps(lhs, rhs, 4);
    #else
            return simd8f_bool(lhs.low() !=rhs.low(),
                          lhs.high()!=rhs.high());
    #endif
        }

    // ----------------------------------------------------------------------------------------

        inline simd8f_bool operator< (const simd8f& lhs, const simd8f& rhs)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_cmp_ps(lhs, rhs, 1);
    #else
            return simd8f_bool(lhs.low() <rhs.low(),
                          lhs.high()<rhs.high());
    #endif
        }

    // ----------------------------------------------------------------------------------------

        inline simd8f_bool operator> (const simd8f& lhs, const simd8f& rhs)
        {
            return rhs < lhs;
        }

    // ----------------------------------------------------------------------------------------

        inline simd8f_bool operator<= (const simd8f& lhs, const simd8f& rhs)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_cmp_ps(lhs, rhs, 2);
    #else
            return simd8f_bool(lhs.low() <=rhs.low(),
                          lhs.high()<=rhs.high());
    #endif
        }

    // ----------------------------------------------------------------------------------------

        inline simd8f_bool operator>= (const simd8f& lhs, const simd8f& rhs)
        {
            return rhs <= lhs;
        }

    // ----------------------------------------------------------------------------------------

        inline simd8f min (const simd8f& lhs, const simd8f& rhs)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_min_ps(lhs, rhs);
    #else
            return simd8f(min(lhs.low(), rhs.low()),
                          min(lhs.high(),rhs.high()));
    #endif
        }

    // ----------------------------------------------------------------------------------------

        inline simd8f max (const simd8f& lhs, const simd8f& rhs)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_max_ps(lhs, rhs);
    #else
            return simd8f(max(lhs.low(), rhs.low()),
                          max(lhs.high(),rhs.high()));
    #endif
        }

    // ----------------------------------------------------------------------------------------

        inline simd8f reciprocal (const simd8f& item)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_rcp_ps(item);
    #else
            return simd8f(reciprocal(item.low()),
                          reciprocal(item.high()));
    #endif
        }

    // ----------------------------------------------------------------------------------------

        inline simd8f reciprocal_sqrt (const simd8f& item)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_rsqrt_ps(item);
    #else
            return simd8f(reciprocal_sqrt(item.low()),
                          reciprocal_sqrt(item.high()));
    #endif
        }

    // ----------------------------------------------------------------------------------------

        inline float sum(const simd8f& item)
        {
    #ifdef DLIB_HAVE_AVX
            simd8f temp = _mm256_hadd_ps(item,item);
            simd8f temp2 = _mm256_hadd_ps(temp,temp);
            return _mm_cvtss_f32(_mm_add_ss(_mm256_castps256_ps128(temp2),_mm256_extractf128_ps(temp2,1)));
    #else
            return sum(item.low()+item.high());
    #endif
        }

    // ----------------------------------------------------------------------------------------

        inline float dot(const simd8f& lhs, const simd8f& rhs)
        {
            return sum(lhs*rhs);
        }

    // ----------------------------------------------------------------------------------------

        inline simd8f sqrt(const simd8f& item)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_sqrt_ps(item);
    #else
            return simd8f(sqrt(item.low()),
                          sqrt(item.high()));
    #endif
        }

    // ----------------------------------------------------------------------------------------

        inline simd8f ceil(const simd8f& item)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_ceil_ps(item);
    #else
            return simd8f(ceil(item.low()),
                          ceil(item.high()));
    #endif
        }

    // ----------------------------------------------------------------------------------------

        inline simd8f floor(const simd8f& item)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_floor_ps(item);
    #else
            return simd8f(floor(item.low()),
                          floor(item.high()));
    #endif
        }

    // ----------------------------------------------------------------------------------------

        // perform cmp ? a : b
        inline simd8f select(const simd8f_bool& cmp, const simd8f& a, const simd8f& b)
        {
    #ifdef DLIB_HAVE_AVX
            return _mm256_blendv_ps(b,a,cmp);
    #else
            return simd8f(select(cmp.low(),  a.low(),  b.low()),
                          select(cmp.high(), a.high(), b.high()));
    #endif
        }

    // ----------------------------------------------------------------------------------------

    }

    #endif // DLIB_sIMD8F_H__