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/** \file     TrafoX86.h
    \brief    SIMD trafo
*/

//! \ingroup CommonLib
//! \{


#include "CommonLib/CommonDef.h"
#include "CommonLib/Rom.h"

#include "CommonDefX86.h"

#include "TrQuant.h"
#include "TrQuant_EMT.h"

namespace vvdec
{

#if ENABLE_SIMD_TCOEFF_OPS
#ifdef TARGET_SIMD_X86

template< X86_VEXT vext, int trSize >
void fastInv_SSE( const TMatrixCoeff* it, const TCoeff* src, TCoeff* dst, unsigned lines, unsigned reducedLines, unsigned rows )
{
  unsigned maxLoopL = std::min<int>( reducedLines, 4 );

#if USE_AVX2
  if( trSize >= 8 && vext >= AVX2 )
  {
    if( ( trSize & 15 ) == 0 )
    {
      static constexpr unsigned trLoops = trSize >= 16 ? trSize >> 4 : 1;

      for( int k = 0; k < rows; k += 2 )
      {
              TCoeff* dstPtr =  dst;

        const TCoeff* srcPtr0 = &src[ k      * lines];
        const TCoeff* srcPtr1 = &src[(k + 1) * lines];

        __m256i vsrc1v[trLoops][2];
        
        const TMatrixCoeff*  itPtr0 = &it[ k      * trSize];
        const TMatrixCoeff*  itPtr1 = &it[(k + 1) * trSize];

        for( int col = 0; col < trLoops; col++, itPtr0 += 16, itPtr1 += 16 )
        {
#if defined( _MSC_VER ) && _MSC_VER > 1900
          __m256i vit16_0 = _mm256_permute4x64_epi64( _mm256_stream_load_si256( ( const __m256i * ) itPtr0 ), ( 0 << 0 ) + ( 1 << 4 ) + ( 2 << 2 ) + ( 3 << 6 ) );
          __m256i vit16_1 = _mm256_permute4x64_epi64( _mm256_stream_load_si256( ( const __m256i * ) itPtr1 ), ( 0 << 0 ) + ( 1 << 4 ) + ( 2 << 2 ) + ( 3 << 6 ) );
#else
          __m256i vit16_0 = _mm256_permute4x64_epi64( _mm256_stream_load_si256( (       __m256i * ) itPtr0 ), ( 0 << 0 ) + ( 1 << 4 ) + ( 2 << 2 ) + ( 3 << 6 ) );
          __m256i vit16_1 = _mm256_permute4x64_epi64( _mm256_stream_load_si256( (       __m256i * ) itPtr1 ), ( 0 << 0 ) + ( 1 << 4 ) + ( 2 << 2 ) + ( 3 << 6 ) );
#endif

          vsrc1v[col][0] = _mm256_unpacklo_epi16( vit16_0, vit16_1 );
          vsrc1v[col][1] = _mm256_unpackhi_epi16( vit16_0, vit16_1 );
        }

        for( int i = 0; i < reducedLines; i += 4, srcPtr0 += maxLoopL, srcPtr1 += maxLoopL )
        {
          __m128i xscale = maxLoopL == 4
                         ? _mm_packs_epi32( _mm_load_si128( ( const __m128i* )srcPtr0 ), _mm_load_si128( ( const __m128i* )srcPtr1 ) )
                         : _mm_packs_epi32( _mm_loadu_si64( ( const __m128i* )srcPtr0 ), _mm_loadu_si64( ( const __m128i* )srcPtr1 ) );

          if( _mm_test_all_zeros( xscale, xscale ) ) { dstPtr += ( trSize * maxLoopL ); continue; }

          xscale = _mm_shuffle_epi8( xscale, _mm_setr_epi8( 0, 1, 8, 9, 2, 3, 10, 11, 4, 5, 12, 13, 6, 7, 14, 15 ) );
          for( int l = 0; l < maxLoopL; l++ )
          {
            __m256i
            vscale = _mm256_broadcastd_epi32( xscale );
            xscale = _mm_bsrli_si128( xscale, 4 );

            for( int col = 0; col < trLoops; col++, dstPtr += 16 )
            {
              __m256i vsrc0 = _mm256_load_si256       ( ( const __m256i * ) dstPtr );

              __m256i
              vsrc1 = vsrc1v[col][0];
              vsrc1 = _mm256_madd_epi16    ( vsrc1, vscale );
              vsrc0 = _mm256_add_epi32     ( vsrc0, vsrc1 );

              _mm256_store_si256           ( ( __m256i * ) dstPtr, vsrc0 );
            
              vsrc0 = _mm256_load_si256    ( ( const __m256i * ) &dstPtr[8] );

              vsrc1 = vsrc1v[col][1];
              vsrc1 = _mm256_madd_epi16    ( vsrc1, vscale );
              vsrc0 = _mm256_add_epi32     ( vsrc0, vsrc1 );

              _mm256_store_si256           ( ( __m256i * ) &dstPtr[8], vsrc0 );
            }
          }
        }
      }
    }
    else
    {
      for( int k = 0; k < rows; k += 2 )
      {
              TCoeff* dstPtr  =  dst;

        const TCoeff* srcPtr0 = &src[ k      * lines];
        const TCoeff* srcPtr1 = &src[(k + 1) * lines];

        const TMatrixCoeff*  itPtr0 = &it[  k      * trSize];
        const TMatrixCoeff*  itPtr1 = &it[( k + 1 ) * trSize];

        __m256i vit;

        {
#if defined( _MSC_VER ) && _MSC_VER > 1900
          __m256i vsrc1 = _mm256_permute4x64_epi64( _mm256_castsi128_si256( _mm_stream_load_si128( ( const __m128i * ) itPtr0 ) ), ( 0 << 0 ) + ( 1 << 4 ) );
#else
          __m256i vsrc1 = _mm256_permute4x64_epi64( _mm256_castsi128_si256( _mm_stream_load_si128( ( __m128i * ) itPtr0 ) ), ( 0 << 0 ) + ( 1 << 4 ) );
#endif
#if defined( _MSC_VER ) && _MSC_VER > 1900
          __m256i vsrc2 = _mm256_permute4x64_epi64( _mm256_castsi128_si256( _mm_stream_load_si128( ( const __m128i * ) itPtr1 ) ), ( 0 << 0 ) + ( 1 << 4 ) );
#else
          __m256i vsrc2 = _mm256_permute4x64_epi64( _mm256_castsi128_si256( _mm_stream_load_si128( ( __m128i * ) itPtr1 ) ), ( 0 << 0 ) + ( 1 << 4 ) );
#endif

          vit = _mm256_unpacklo_epi16( vsrc1, vsrc2 );
        }
        
        for( int i = 0; i < reducedLines; i += 4, srcPtr0 += maxLoopL, srcPtr1 += maxLoopL )
        {
          __m128i xscale = maxLoopL == 4
                         ? _mm_packs_epi32( _mm_load_si128( ( const __m128i* )srcPtr0 ), _mm_load_si128( ( const __m128i* )srcPtr1 ) )
                         : _mm_packs_epi32( _mm_loadu_si64( ( const __m128i* )srcPtr0 ), _mm_loadu_si64( ( const __m128i* )srcPtr1 ) );

          if( _mm_test_all_zeros( xscale, xscale ) ) { dstPtr += ( trSize * maxLoopL ); continue; }

          xscale = _mm_shuffle_epi8( xscale, _mm_setr_epi8( 0, 1, 8, 9, 2, 3, 10, 11, 4, 5, 12, 13, 6, 7, 14, 15 ) );
          for( int l = 0; l < maxLoopL; l++ )
          {
            __m256i
            vscale = _mm256_broadcastd_epi32( xscale );
            xscale = _mm_bsrli_si128( xscale, 4 );

            for( int col = 0; col < trSize; col += 8, dstPtr += 8, itPtr0 += 8, itPtr1 += 8 )
            {
              __m256i
              vsrc0 = _mm256_load_si256    ( ( const __m256i * ) dstPtr );
              __m256i
              vsrc1 = _mm256_madd_epi16    ( vit, vscale );
              vsrc0 = _mm256_add_epi32     ( vsrc0, vsrc1 );

              _mm256_store_si256           ( ( __m256i * ) dstPtr, vsrc0 );
            }
          }
        }
      }
    }
  }
#else
  if( trSize >= 8 )
  {
    for( int k = 0; k < rows; k += 2 )
    {
            TCoeff* dstPtr  =  dst;

      const TCoeff* srcPtr0 = &src[ k      * lines];
      const TCoeff* srcPtr1 = &src[(k + 1) * lines];
        
      for( int i = 0; i < reducedLines; i += 4, srcPtr0 += maxLoopL, srcPtr1 += maxLoopL )
      {
        __m128i xscale = maxLoopL == 4
                        ? _mm_packs_epi32( _mm_load_si128( ( const __m128i* )srcPtr0 ), _mm_load_si128( ( const __m128i* )srcPtr1 ) )
                        : _mm_packs_epi32( _mm_loadu_si64( ( const __m128i* )srcPtr0 ), _mm_loadu_si64( ( const __m128i* )srcPtr1 ) );

        if( _mm_test_all_zeros( xscale, xscale ) ) { dstPtr += ( trSize * maxLoopL ); continue; }

        xscale = _mm_shuffle_epi8( xscale, _mm_setr_epi8( 0, 1, 8, 9, 2, 3, 10, 11, 4, 5, 12, 13, 6, 7, 14, 15 ) );
        for( int l = 0; l < maxLoopL; l++ )
        {
          const TMatrixCoeff*  itPtr0 = &it[k         * trSize];
          const TMatrixCoeff*  itPtr1 = &it[( k + 1 ) * trSize];

          __m128i
          vscale = _mm_set1_epi32( _mm_cvtsi128_si32( xscale ) );
          xscale = _mm_bsrli_si128( xscale, 4 );

          for( int col = 0; col < trSize; col += 8, dstPtr += 8, itPtr0 += 8, itPtr1 += 8 )
          {
            __m128i vsrc0   = _mm_load_si128       ( ( const __m128i * ) dstPtr );
#if defined( _MSC_VER ) && _MSC_VER > 1900
            __m128i vit16_0 = _mm_stream_load_si128( ( const __m128i * ) itPtr0 );
            __m128i vit16_1 = _mm_stream_load_si128( ( const __m128i * ) itPtr1 );
#else
            __m128i vit16_0 = _mm_stream_load_si128( (       __m128i * ) itPtr0 );
            __m128i vit16_1 = _mm_stream_load_si128( (       __m128i * ) itPtr1 );
#endif

            __m128i vsrc1 = _mm_unpacklo_epi16( vit16_0, vit16_1 );

            vsrc1 = _mm_madd_epi16 ( vsrc1, vscale );
            vsrc0 = _mm_add_epi32  ( vsrc0, vsrc1 );

            _mm_store_si128        ( ( __m128i * ) dstPtr, vsrc0 );
          
            vsrc0 = _mm_load_si128 ( ( const __m128i * ) &dstPtr[4] );
          
            vsrc1 = _mm_unpackhi_epi16( vit16_0, vit16_1 );

            vsrc1 = _mm_madd_epi16 ( vsrc1, vscale );
            vsrc0 = _mm_add_epi32  ( vsrc0, vsrc1 );
          
            _mm_store_si128        ( ( __m128i * ) &dstPtr[4], vsrc0 );
          }
        }
      }
    }
  }
#endif
  else if( trSize == 4 )
  {
    for( int k = 0; k < rows; k += 2 )
    {
            TCoeff* dstPtr  =  dst;

      const TCoeff* srcPtr0 = &src[ k      * lines];
      const TCoeff* srcPtr1 = &src[(k + 1) * lines];

      const TMatrixCoeff*  itPtr0 = &it[  k       * trSize];
      const TMatrixCoeff*  itPtr1 = &it[( k + 1 ) * trSize];

      __m128i vit = _mm_unpacklo_epi16( _mm_loadu_si64( ( const __m128i * ) itPtr0 ), _mm_loadu_si64( ( const __m128i * ) itPtr1 ) );
 
      for( int i = 0; i < reducedLines; i += 4, srcPtr0 += maxLoopL, srcPtr1 += maxLoopL )
      {
        __m128i xscale = maxLoopL == 4
                        ? _mm_packs_epi32( _mm_load_si128( ( const __m128i* )srcPtr0 ), _mm_load_si128( ( const __m128i* )srcPtr1 ) )
                        : _mm_packs_epi32( _mm_loadu_si64( ( const __m128i* )srcPtr0 ), _mm_loadu_si64( ( const __m128i* )srcPtr1 ) );

        if( _mm_test_all_zeros( xscale, xscale ) ) { dstPtr += ( trSize * maxLoopL ); continue; }

        xscale = _mm_shuffle_epi8( xscale, _mm_setr_epi8( 0, 1, 8, 9, 2, 3, 10, 11, 4, 5, 12, 13, 6, 7, 14, 15 ) );
        for( int l = 0; l < maxLoopL; l++ )
        {
          __m128i
          vscale = _mm_set1_epi32( _mm_cvtsi128_si32( xscale ) );
          xscale = _mm_bsrli_si128( xscale, 4 );

          for( int col = 0; col < trSize; col += 4, dstPtr += 4 )
          {
            __m128i
            vsrc0 = _mm_load_si128 ( ( const __m128i * ) dstPtr );
            __m128i 
            vsrc1 = _mm_madd_epi16 ( vit, vscale );
            vsrc0 = _mm_add_epi32  ( vsrc0, vsrc1 );

            _mm_store_si128        ( ( __m128i * ) dstPtr, vsrc0 );
          }
        }
      }
    }
  }
  else
  {
    THROW_FATAL( "Unsupported size" );
  }
#if USE_AVX2

  _mm256_zeroupper();
#endif
}

template< X86_VEXT vext, int W >
void roundClip_SSE( TCoeff *dst, unsigned width, unsigned height, unsigned stride, const TCoeff outputMin, const TCoeff outputMax, const TCoeff round, const TCoeff shift )
{
#if USE_AVX2
  if( W >= 8 && vext >= AVX2 )
  {
    __m256i vmin = _mm256_set1_epi32( outputMin );
    __m256i vmax = _mm256_set1_epi32( outputMax );
    __m256i vrnd = _mm256_set1_epi32( round );

    while( height-- )
    {
      for( int col = 0; col < width; col += 8 )
      {
        __m256i
        vdst = _mm256_load_si256( ( __m256i * ) &dst[col] );
        vdst = _mm256_add_epi32 ( vdst, vrnd );
        vdst = _mm256_srai_epi32( vdst, shift );
        vdst = _mm256_max_epi32 ( vdst, vmin );
        vdst = _mm256_min_epi32 ( vdst, vmax );
        _mm256_store_si256      ( ( __m256i * ) &dst[col], vdst );
      }

      dst += stride;
    }
  }
  else
#endif
  if( W >= 4 )
  {
    __m128i vmin = _mm_set1_epi32( outputMin );
    __m128i vmax = _mm_set1_epi32( outputMax );
    __m128i vrnd = _mm_set1_epi32( round );

    while( height-- )
    {
      for( int col = 0; col < width; col += 4 )
      {
        __m128i
        vdst = _mm_load_si128 ( ( __m128i * ) &dst[col] );
        vdst = _mm_add_epi32  ( vdst, vrnd );
        vdst = _mm_srai_epi32 ( vdst, shift );
        vdst = _mm_max_epi32  ( vdst, vmin );
        vdst = _mm_min_epi32  ( vdst, vmax );
        _mm_store_si128       ( ( __m128i * ) &dst[col], vdst );
      }

      dst += stride;
    }
  }
  else
  {
    THROW_FATAL( "Unsupported size" );
  }
#if USE_AVX2

  _mm256_zeroupper();
#endif
}

template< X86_VEXT vext, int W >
void cpyResiClip_SSE( const TCoeff* src, Pel* dst, ptrdiff_t stride, unsigned width, unsigned height, const TCoeff outputMin, const TCoeff outputMax, const TCoeff round, const TCoeff shift )
{
#if USE_AVX2
  if( W >= 16 )
  {
    __m256i vmin = _mm256_set1_epi32( outputMin );
    __m256i vmax = _mm256_set1_epi32( outputMax );
    __m256i vrnd = _mm256_set1_epi32( round );

    while( height-- )
    {
      for( int col = 0; col < width; col += 16 )
      {
        __m256i
        vsrc1 = _mm256_load_si256 ( ( const __m256i * ) &src[col] );
        vsrc1 = _mm256_add_epi32  ( vsrc1, vrnd );
        vsrc1 = _mm256_srai_epi32 ( vsrc1, shift );
        vsrc1 = _mm256_max_epi32  ( _mm256_min_epi32( vsrc1, vmax ), vmin );

        __m256i                
        vsrc2 = _mm256_load_si256 ( ( const __m256i * ) &src[col+8] );
        vsrc2 = _mm256_add_epi32  ( vsrc2, vrnd );
        vsrc2 = _mm256_srai_epi32 ( vsrc2, shift );
        vsrc2 = _mm256_max_epi32  ( _mm256_min_epi32( vsrc2, vmax ), vmin );

        __m256i
        vdst  = _mm256_packs_epi32( vsrc1, vsrc2 );
        vdst  = _mm256_permute4x64_epi64( vdst, ( 0 << 0 ) + ( 1 << 4 ) + ( 2 << 2 ) + ( 3 << 6 ) );
        _mm256_storeu_si256       ( ( __m256i * ) &dst[col], vdst );
      }

      src += width;
      dst += stride;
    }
  }
  else
#endif
  if( W >= 8 )
  {
    __m128i vmin = _mm_set1_epi32( outputMin );
    __m128i vmax = _mm_set1_epi32( outputMax );
    __m128i vrnd = _mm_set1_epi32( round );

    while( height-- )
    {
      for( int col = 0; col < width; col += 8 )
      {
        __m128i
        vsrc1 = _mm_load_si128 ( ( const __m128i * ) &src[col] );
        vsrc1 = _mm_add_epi32  ( vsrc1, vrnd );
        vsrc1 = _mm_srai_epi32 ( vsrc1, shift );
        vsrc1 = _mm_max_epi32  ( _mm_min_epi32( vsrc1, vmax ), vmin );
        __m128i                
        vsrc2 = _mm_load_si128 ( ( const __m128i * ) &src[col+4] );
        vsrc2 = _mm_add_epi32  ( vsrc2, vrnd );
        vsrc2 = _mm_srai_epi32 ( vsrc2, shift );
        vsrc2 = _mm_max_epi32  ( _mm_min_epi32( vsrc2, vmax ), vmin );
        __m128i
        vdst  = _mm_packs_epi32( vsrc1, vsrc2 );
        _mm_storeu_si128       ( ( __m128i * ) &dst[col], vdst );
      }

      src += width;
      dst += stride;
    }
  }
  else if( W >= 4 )
  {
    __m128i vmin = _mm_set1_epi32( outputMin );
    __m128i vmax = _mm_set1_epi32( outputMax );
    __m128i vrnd = _mm_set1_epi32( round );

    __m128i vzero = _mm_setzero_si128();
    __m128i vdst;

    while( height-- )
    {
      for( int col = 0; col < width; col += 4 )
      {
        vdst = _mm_load_si128 ( ( const __m128i * ) &src[col] );
        vdst = _mm_add_epi32  ( vdst, vrnd );
        vdst = _mm_srai_epi32 ( vdst, shift );
        vdst = _mm_max_epi32  ( _mm_min_epi32( vdst, vmax ), vmin );
        vdst = _mm_packs_epi32( vdst, vzero );
        _mm_storeu_si64       ( ( __m128i * ) &dst[col], vdst );
      }

      src += width;
      dst += stride;
    }
  }
  else
  {
    THROW_FATAL( "Unsupported size" );
  }
}

template<X86_VEXT vext>
static void simdInvLfnstNxNCore( int* src, int* dst, const uint32_t mode, const uint32_t index, const uint32_t size, int zeroOutSize )
{
  CHECK( index > 2 || ( zeroOutSize != 8 && zeroOutSize != 16 ), "Wrong parameters" );

  static constexpr int maxLog2TrDynamicRange = 15;
  const TCoeff    outputMinimum = -( 1 << maxLog2TrDynamicRange );
  const TCoeff    outputMaximum =  ( 1 << maxLog2TrDynamicRange ) - 1;
  const int8_t*   trMat         = ( size > 4 ) ? g_lfnst8x8[mode][index][0] : g_lfnst4x4[mode][index][0];
  const int       trSize        = ( size > 4 ) ? 48 : 16;
  int*            out           = dst;

  const __m128i vzero = _mm_setzero_si128();
  const __m128i vmin  = _mm_set1_epi32( outputMinimum );
  const __m128i vmax  = _mm_set1_epi32( outputMaximum );

  for( int j = 0; j < trSize; j += 4, out += 4 )
  {
    __m128i       vsum[4];

    for( int k = 0; k < 4; k++, trMat += 16 )
    {
      const int8_t* trMatTmp = trMat;
      int* srcPtr = src;

      __m128i vsrc;
      __m128i vtr;
      __m128i vtmp;
      __m128i vcur = vzero;

      for( int i = 0; i < zeroOutSize; i += 8, srcPtr += 8, trMatTmp += 8 )
      {
        vsrc = _mm_loadu_si128( ( const __m128i* ) srcPtr );
        vtr  = _mm_loadu_si64( ( const __m128i* ) trMatTmp );
        vtr  = _mm_cvtepi8_epi16( vtr );
        vtmp = _mm_cvtepi16_epi32( vtr );

        vtmp = _mm_mullo_epi32( vsrc, vtmp );
        vcur = _mm_add_epi32( vtmp, vcur );

        vsrc = _mm_loadu_si128( ( const __m128i* ) &srcPtr[4] );
        vtmp = _mm_cvtepi16_epi32( _mm_unpackhi_epi64( vtr, vzero ) );
      
        vtmp = _mm_mullo_epi32( vsrc, vtmp );
        vcur = _mm_add_epi32( vtmp, vcur );
      }

      vsum[k] = vcur;
    }

    __m128i vout = _mm_hadd_epi32( _mm_hadd_epi32( vsum[0], vsum[1] ), _mm_hadd_epi32( vsum[2], vsum[3] ) );
    vout = _mm_add_epi32( vout, _mm_set1_epi32( 64 ) );
    vout = _mm_srai_epi32( vout, 7 );
    vout = _mm_min_epi32( _mm_max_epi32( vmin, vout ), vmax );

    _mm_storeu_si128( ( __m128i* ) out, vout );
  }
}

template<X86_VEXT vext>
void TCoeffOps::_initTCoeffOpsX86()
{
  cpyResiClip[2] = cpyResiClip_SSE<vext,  4>;
  cpyResiClip[3] = cpyResiClip_SSE<vext,  8>;
  cpyResiClip[4] = cpyResiClip_SSE<vext, 16>;
  cpyResiClip[5] = cpyResiClip_SSE<vext, 32>;
  cpyResiClip[6] = cpyResiClip_SSE<vext, 64>;
  roundClip4     = roundClip_SSE<vext,  4>;
  roundClip8     = roundClip_SSE<vext,  8>;
  fastInvCore[0] = fastInv_SSE  <vext,  4>;
  fastInvCore[1] = fastInv_SSE  <vext,  8>;
  fastInvCore[2] = fastInv_SSE  <vext, 16>;
  fastInvCore[3] = fastInv_SSE  <vext, 32>;
  fastInvCore[4] = fastInv_SSE  <vext, 64>;
}

template<X86_VEXT vext>
void TrQuant::_initTrQuantX86()
{
  m_invLfnstNxN = simdInvLfnstNxNCore<vext>;
}

template void TCoeffOps::_initTCoeffOpsX86<SIMDX86>();
template void TrQuant::_initTrQuantX86<SIMDX86>();

#endif // TARGET_SIMD_X86
#endif

}
