text: // Copyright (C) 2013  Davis E. King (davis@dlib.net)
  // License: Boost Software License   See LICENSE.txt for the full license.
  #ifndef DLIB_sIMD4F_H__
  #define DLIB_sIMD4F_H__
  
  #include "simd_check.h"
  #include "simd4i.h"
  #include <cmath>
  #include <iostream>
  
  namespace dlib
  {
  
  #ifdef DLIB_HAVE_SSE2
      class simd4f
      {
      public:
          typedef float type;
  
          inline simd4f() {}
          inline simd4f(float f) { x = _mm_set1_ps(f); }
          inline simd4f(float r0, float r1, float r2, float r3) { x = _mm_setr_ps(r0,r1,r2,r3); }
          inline simd4f(const __m128& val):x(val) {}
          inline simd4f(const simd4i& val):x(_mm_cvtepi32_ps(val)) {}
  
          inline simd4f& operator=(const simd4i& val)
          {
              x = simd4f(val);
              return *this;
          }
  
          inline simd4f& operator=(const __m128& val)
          {
              x = val;
              return *this;
          }
  
          inline operator __m128() const { return x; }
  
          // truncate to 32bit integers
          inline operator __m128i() const { return _mm_cvttps_epi32(x); }
  
          inline void load_aligned(const type* ptr)  { x = _mm_load_ps(ptr); }
          inline void store_aligned(type* ptr) const { _mm_store_ps(ptr, x); }
          inline void load(const type* ptr)          { x = _mm_loadu_ps(ptr); }
          inline void store(type* ptr)         const { _mm_storeu_ps(ptr, x); }
  
          inline unsigned int size() const { return 4; }
          inline float operator[](unsigned int idx) const 
          {
              float temp[4];
              store(temp);
              return temp[idx];
          }
  
      private:
          __m128 x;
      };
  
      class simd4f_bool
      {
      public:
          typedef float type;
  
          inline simd4f_bool() {}
          inline simd4f_bool(const __m128& val):x(val) {}
  
          inline simd4f_bool& operator=(const __m128& val)
          {
              x = val;
              return *this;
          }
  
          inline operator __m128() const { return x; }
  
  
      private:
          __m128 x;
      };
  #else
      class simd4f
      {
      public:
          typedef float type;
  
          inline simd4f() {}
          inline simd4f(float f) { x[0]=f; x[1]=f; x[2]=f; x[3]=f; }
          inline simd4f(float r0, float r1, float r2, float r3) { x[0]=r0; x[1]=r1; x[2]=r2; x[3]=r3;}
          inline simd4f(const simd4i& val) { x[0]=val[0]; x[1]=val[1]; x[2]=val[2]; x[3]=val[3];}
  
          // truncate to 32bit integers
          inline operator simd4i::rawarray() const 
          { 
              simd4i::rawarray temp;
              temp.a[0] = (int32)x[0];
              temp.a[1] = (int32)x[1];
              temp.a[2] = (int32)x[2];
              temp.a[3] = (int32)x[3];
              return temp;
          }
  
          inline simd4f& operator=(const simd4i& val)
          {
              x[0] = val[0];
              x[1] = val[1];
              x[2] = val[2];
              x[3] = val[3];
              return *this;
          }
  
  
          inline void load_aligned(const type* ptr)
          {
              x[0] = ptr[0];
              x[1] = ptr[1];
              x[2] = ptr[2];
              x[3] = ptr[3];
          }
  
          inline void store_aligned(type* ptr) const
          {
              ptr[0] = x[0];
              ptr[1] = x[1];
              ptr[2] = x[2];
              ptr[3] = x[3];
          }
  
          inline void load(const type* ptr)
          {
              x[0] = ptr[0];
              x[1] = ptr[1];
              x[2] = ptr[2];
              x[3] = ptr[3];
          }
  
          inline void store(type* ptr) const
          {
              ptr[0] = x[0];
              ptr[1] = x[1];
              ptr[2] = x[2];
              ptr[3] = x[3];
          }
  
          inline unsigned int size() const { return 4; }
          inline float operator[](unsigned int idx) const { return x[idx]; }
  
      private:
          float x[4];
      };
  
      class simd4f_bool
      {
      public:
          typedef float type;
  
          inline simd4f_bool() {}
          inline simd4f_bool(bool r0, bool r1, bool r2, bool r3) { x[0]=r0; x[1]=r1; x[2]=r2; x[3]=r3;}
  
          inline bool operator[](unsigned int idx) const { return x[idx]; }
      private:
          bool x[4];
      };
  #endif
  
  // ----------------------------------------------------------------------------------------
  
      inline std::ostream& operator<<(std::ostream& out, const simd4f& item)
      {
          float temp[4];
          item.store(temp);
          out << "(" << temp[0] << ", " << temp[1] << ", " << temp[2] << ", " << temp[3] << ")";
          return out;
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f operator+ (const simd4f& lhs, const simd4f& rhs) 
      { 
  #ifdef DLIB_HAVE_SSE2
          return _mm_add_ps(lhs, rhs); 
  #else
          return simd4f(lhs[0]+rhs[0],
                        lhs[1]+rhs[1],
                        lhs[2]+rhs[2],
                        lhs[3]+rhs[3]);
  #endif
      }
      inline simd4f& operator+= (simd4f& lhs, const simd4f& rhs) 
      { return lhs = lhs + rhs; return lhs;}
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f operator- (const simd4f& lhs, const simd4f& rhs) 
      { 
  #ifdef DLIB_HAVE_SSE2
          return _mm_sub_ps(lhs, rhs); 
  #else
          return simd4f(lhs[0]-rhs[0],
                        lhs[1]-rhs[1],
                        lhs[2]-rhs[2],
                        lhs[3]-rhs[3]);
  #endif
      }
      inline simd4f& operator-= (simd4f& lhs, const simd4f& rhs) 
      { return lhs = lhs - rhs; return lhs;}
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f operator* (const simd4f& lhs, const simd4f& rhs) 
      { 
  #ifdef DLIB_HAVE_SSE2
          return _mm_mul_ps(lhs, rhs); 
  #else
          return simd4f(lhs[0]*rhs[0],
                        lhs[1]*rhs[1],
                        lhs[2]*rhs[2],
                        lhs[3]*rhs[3]);
  #endif
      }
      inline simd4f& operator*= (simd4f& lhs, const simd4f& rhs) 
      { return lhs = lhs * rhs; return lhs;}
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f operator/ (const simd4f& lhs, const simd4f& rhs) 
      { 
  #ifdef DLIB_HAVE_SSE2
          return _mm_div_ps(lhs, rhs); 
  #else
          return simd4f(lhs[0]/rhs[0],
                        lhs[1]/rhs[1],
                        lhs[2]/rhs[2],
                        lhs[3]/rhs[3]);
  #endif
      }
      inline simd4f& operator/= (simd4f& lhs, const simd4f& rhs) 
      { return lhs = lhs / rhs; return lhs;}
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f_bool operator== (const simd4f& lhs, const simd4f& rhs) 
      { 
  #ifdef DLIB_HAVE_SSE2
          return _mm_cmpeq_ps(lhs, rhs); 
  #else
          return simd4f_bool(lhs[0]==rhs[0],
                             lhs[1]==rhs[1],
                             lhs[2]==rhs[2],
                             lhs[3]==rhs[3]);
  #endif
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f_bool operator!= (const simd4f& lhs, const simd4f& rhs) 
      { 
  #ifdef DLIB_HAVE_SSE2
          return _mm_cmpneq_ps(lhs, rhs); 
  #else
          return simd4f_bool(lhs[0]!=rhs[0],
                             lhs[1]!=rhs[1],
                             lhs[2]!=rhs[2],
                             lhs[3]!=rhs[3]);
  #endif
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f_bool operator< (const simd4f& lhs, const simd4f& rhs) 
      { 
  #ifdef DLIB_HAVE_SSE2
          return _mm_cmplt_ps(lhs, rhs); 
  #else
          return simd4f_bool(lhs[0]<rhs[0],
                             lhs[1]<rhs[1],
                             lhs[2]<rhs[2],
                             lhs[3]<rhs[3]);
  #endif
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f_bool operator> (const simd4f& lhs, const simd4f& rhs) 
      { 
          return rhs < lhs;
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f_bool operator<= (const simd4f& lhs, const simd4f& rhs) 
      { 
  #ifdef DLIB_HAVE_SSE2
          return _mm_cmple_ps(lhs, rhs); 
  #else
          return simd4f_bool(lhs[0]<=rhs[0],
                             lhs[1]<=rhs[1],
                             lhs[2]<=rhs[2],
                             lhs[3]<=rhs[3]);
  #endif
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f_bool operator>= (const simd4f& lhs, const simd4f& rhs) 
      { 
          return rhs <= lhs;
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f min (const simd4f& lhs, const simd4f& rhs) 
      { 
  #ifdef DLIB_HAVE_SSE2
          return _mm_min_ps(lhs, rhs); 
  #else
          return simd4f(std::min(lhs[0],rhs[0]),
                        std::min(lhs[1],rhs[1]),
                        std::min(lhs[2],rhs[2]),
                        std::min(lhs[3],rhs[3]));
  #endif
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f max (const simd4f& lhs, const simd4f& rhs) 
      { 
  #ifdef DLIB_HAVE_SSE2
          return _mm_max_ps(lhs, rhs); 
  #else
          return simd4f(std::max(lhs[0],rhs[0]),
                        std::max(lhs[1],rhs[1]),
                        std::max(lhs[2],rhs[2]),
                        std::max(lhs[3],rhs[3]));
  #endif
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f reciprocal (const simd4f& item) 
      { 
  #ifdef DLIB_HAVE_SSE2
          return _mm_rcp_ps(item); 
  #else
          return simd4f(1.0f/item[0],
                        1.0f/item[1],
                        1.0f/item[2],
                        1.0f/item[3]);
  #endif
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f reciprocal_sqrt (const simd4f& item) 
      { 
  #ifdef DLIB_HAVE_SSE2
          return _mm_rsqrt_ps(item); 
  #else
          return simd4f(1.0f/std::sqrt(item[0]),
                        1.0f/std::sqrt(item[1]),
                        1.0f/std::sqrt(item[2]),
                        1.0f/std::sqrt(item[3]));
  #endif
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline float dot(const simd4f& lhs, const simd4f& rhs);
      inline float sum(const simd4f& item)
      {
  #ifdef DLIB_HAVE_SSE41
          return dot(simd4f(1), item);
  #elif defined(DLIB_HAVE_SSE3)
          simd4f temp = _mm_hadd_ps(item,item);
          return _mm_cvtss_f32(_mm_hadd_ps(temp,temp));
  #elif defined(DLIB_HAVE_SSE2) && (!defined(_MSC_VER) || _MSC_VER!=1400)
          simd4f temp = _mm_add_ps(item,_mm_movehl_ps(item,item));
          simd4f temp2 = _mm_shuffle_ps(temp,temp,1);
          return _mm_cvtss_f32(_mm_add_ss(temp,temp2));
  #else
          return item[0]+item[1]+item[2]+item[3];
  #endif
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline float dot(const simd4f& lhs, const simd4f& rhs)
      {
  #ifdef DLIB_HAVE_SSE41
          return _mm_cvtss_f32(_mm_dp_ps(lhs, rhs, 0xff));
  #else
          return sum(lhs*rhs);
  #endif
      }
     
  // ----------------------------------------------------------------------------------------
  
      inline simd4f sqrt(const simd4f& item)
      {
  #ifdef DLIB_HAVE_SSE2
          return _mm_sqrt_ps(item);
  #else
          return simd4f(std::sqrt(item[0]),
                        std::sqrt(item[1]),
                        std::sqrt(item[2]),
                        std::sqrt(item[3]));
  #endif
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f ceil(const simd4f& item)
      {
  #ifdef DLIB_HAVE_SSE41
          return _mm_ceil_ps(item);
  #elif defined(DLIB_HAVE_SSE2)
          float temp[4];
          item.store(temp);
          temp[0] = std::ceil(temp[0]);
          temp[1] = std::ceil(temp[1]);
          temp[2] = std::ceil(temp[2]);
          temp[3] = std::ceil(temp[3]);
          simd4f temp2;
          temp2.load(temp);
          return temp2;
  #else
          return simd4f(std::ceil(item[0]),
                        std::ceil(item[1]),
                        std::ceil(item[2]),
                        std::ceil(item[3]));
  #endif
      }
  
  // ----------------------------------------------------------------------------------------
  
      inline simd4f floor(const simd4f& item)
      {
  #ifdef DLIB_HAVE_SSE41
          return _mm_floor_ps(item);
  #elif defined(DLIB_HAVE_SSE2)
          float temp[4];
          item.store(temp);
          temp[0] = std::floor(temp[0]);
          temp[1] = std::floor(temp[1]);
          temp[2] = std::floor(temp[2]);
          temp[3] = std::floor(temp[3]);
          simd4f temp2;
          temp2.load(temp);
          return temp2;
  #else
          return simd4f(std::floor(item[0]),
                        std::floor(item[1]),
                        std::floor(item[2]),
                        std::floor(item[3]));
  #endif
      }
  
  // ----------------------------------------------------------------------------------------
  
      // perform cmp ? a : b
      inline simd4f select(const simd4f_bool& cmp, const simd4f& a, const simd4f& b)
      {
  #ifdef DLIB_HAVE_SSE41
          return _mm_blendv_ps(b,a,cmp);
  #elif defined(DLIB_HAVE_SSE2)
          return _mm_or_ps(_mm_and_ps(cmp,a) , _mm_andnot_ps(cmp,b));
  #else
          return simd4f(cmp[0]?a[0]:b[0],
                        cmp[1]?a[1]:b[1],
                        cmp[2]?a[2]:b[2],
                        cmp[3]?a[3]:b[3]);
  #endif
      }
  
  // ----------------------------------------------------------------------------------------
  
  }
  
  #endif // DLIB_sIMD4F_H__
  
  