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/** \file     InterpolationFilter_neon.h
    \brief    SIMD for InterpolationFilter
*/

#pragma once

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

#include <arm_neon.h>

//! \ingroup CommonLib
//! \{

#if defined( TARGET_SIMD_ARM ) && ENABLE_SIMD_OPT_MCIF

namespace vvdec
{

template<bool isLast>
static inline int16x4_t pack_sum_s32_to_s16x4( int32x4_t vsuma, int16x4_t vibdimax )
{
  if( isLast )
  {
    // Narrow to u16 with saturation (clamp negatives to 0), then clamp at vibdimax.
    uint16x4_t usum = vqmovun_s32( vsuma );
    return vmin_s16( vibdimax, vreinterpret_s16_u16( usum ) );
  }
  else
  {
    // Narrow to s16 with saturation.
    return vqmovn_s32( vsuma );
  }
}

template<bool isLast>
static inline int16x8_t pack_sum_s32_to_s16x8( int32x4_t vsuma, int32x4_t vsumb, int16x8_t vibdimax )
{
  if( isLast )
  {
    // Narrow to u16 with saturation (clamp negatives to 0), then clamp at vibdimax.
    uint16x8_t usum = vcombine_u16( vqmovun_s32( vsuma ), vqmovun_s32( vsumb ) );
    return vminq_s16( vibdimax, vreinterpretq_s16_u16( usum ) );
  }
  else
  {
    // Narrow to s16 with saturation.
    return vcombine_s16( vqmovn_s32( vsuma ), vqmovn_s32( vsumb ) );
  }
}

static inline int32x4_t filter_vert_4x1_N6_neon( int16x4_t const vsrc[6], int16x8_t cv, int32x4_t voffset2 )
{
  // For 6-tap, the 0th and 7th cv coefficients are zeros so remove them.
  int32x4_t vsum = vmlal_lane_s16( voffset2, vsrc[0], vget_low_s16( cv ), 1 );
  vsum = vmlal_lane_s16( vsum, vsrc[1], vget_low_s16( cv ), 2 );
  vsum = vmlal_lane_s16( vsum, vsrc[2], vget_low_s16( cv ), 3 );
  vsum = vmlal_lane_s16( vsum, vsrc[3], vget_high_s16( cv ), 0 );
  vsum = vmlal_lane_s16( vsum, vsrc[4], vget_high_s16( cv ), 1 );
  vsum = vmlal_lane_s16( vsum, vsrc[5], vget_high_s16( cv ), 2 );
  return vsum;
}

static inline int32x4x2_t filter_vert_8x1_N8_neon( int16x8_t const vsrc[8], int16x8_t cv, int32x4_t voffset2 )
{
  int32x4x2_t vsum;
  vsum.val[0] = vmlal_lane_s16( voffset2, vget_low_s16( vsrc[0] ), vget_low_s16( cv ), 0 );
  vsum.val[1] = vmlal_lane_s16( voffset2, vget_high_s16( vsrc[0] ), vget_low_s16( cv ), 0 );
  vsum.val[0] = vmlal_lane_s16( vsum.val[0], vget_low_s16( vsrc[1] ), vget_low_s16( cv ), 1 );
  vsum.val[1] = vmlal_lane_s16( vsum.val[1], vget_high_s16( vsrc[1] ), vget_low_s16( cv ), 1 );
  vsum.val[0] = vmlal_lane_s16( vsum.val[0], vget_low_s16( vsrc[2] ), vget_low_s16( cv ), 2 );
  vsum.val[1] = vmlal_lane_s16( vsum.val[1], vget_high_s16( vsrc[2] ), vget_low_s16( cv ), 2 );
  vsum.val[0] = vmlal_lane_s16( vsum.val[0], vget_low_s16( vsrc[3] ), vget_low_s16( cv ), 3 );
  vsum.val[1] = vmlal_lane_s16( vsum.val[1], vget_high_s16( vsrc[3] ), vget_low_s16( cv ), 3 );
  vsum.val[0] = vmlal_lane_s16( vsum.val[0], vget_low_s16( vsrc[4] ), vget_high_s16( cv ), 0 );
  vsum.val[1] = vmlal_lane_s16( vsum.val[1], vget_high_s16( vsrc[4] ), vget_high_s16( cv ), 0 );
  vsum.val[0] = vmlal_lane_s16( vsum.val[0], vget_low_s16( vsrc[5] ), vget_high_s16( cv ), 1 );
  vsum.val[1] = vmlal_lane_s16( vsum.val[1], vget_high_s16( vsrc[5] ), vget_high_s16( cv ), 1 );
  vsum.val[0] = vmlal_lane_s16( vsum.val[0], vget_low_s16( vsrc[6] ), vget_high_s16( cv ), 2 );
  vsum.val[1] = vmlal_lane_s16( vsum.val[1], vget_high_s16( vsrc[6] ), vget_high_s16( cv ), 2 );
  vsum.val[0] = vmlal_lane_s16( vsum.val[0], vget_low_s16( vsrc[7] ), vget_high_s16( cv ), 3 );
  vsum.val[1] = vmlal_lane_s16( vsum.val[1], vget_high_s16( vsrc[7] ), vget_high_s16( cv ), 3 );
  return vsum;
}

static inline int32x4x4_t filter_vert_16x1_N8_neon( int16x8x2_t const vsrc[8], int16x8_t cv, int32x4_t voffset2 )
{
  int16x8_t vsrc0[8] = { vsrc[0].val[0], vsrc[1].val[0], vsrc[2].val[0], vsrc[3].val[0],
                         vsrc[4].val[0], vsrc[5].val[0], vsrc[6].val[0], vsrc[7].val[0] };
  int16x8_t vsrc1[8] = { vsrc[0].val[1], vsrc[1].val[1], vsrc[2].val[1], vsrc[3].val[1],
                         vsrc[4].val[1], vsrc[5].val[1], vsrc[6].val[1], vsrc[7].val[1] };

  int32x4x2_t vsum0 = filter_vert_8x1_N8_neon( vsrc0, cv, voffset2 );
  int32x4x2_t vsum1 = filter_vert_8x1_N8_neon( vsrc1, cv, voffset2 );

  int32x4x4_t vsum;
  vsum.val[0] = vsum0.val[0];
  vsum.val[1] = vsum0.val[1];
  vsum.val[2] = vsum1.val[0];
  vsum.val[3] = vsum1.val[1];
  return vsum;
}

static inline int32x4_t filter_vert_4x1_N4_neon( int16x4_t const vsrc[4], int16x4_t cv, int32x4_t voffset2 )
{
  int32x4_t vsum = vmlal_lane_s16( voffset2, vsrc[0], cv, 0 );
  vsum = vmlal_lane_s16( vsum, vsrc[1], cv, 1 );
  vsum = vmlal_lane_s16( vsum, vsrc[2], cv, 2 );
  vsum = vmlal_lane_s16( vsum, vsrc[3], cv, 3 );
  return vsum;
}

static inline int32x4x2_t filter_vert_8x1_N4_neon( int16x8_t const vsrc[4], int16x4_t cv, int32x4_t voffset2 )
{
  int32x4x2_t vsum;
  vsum.val[0] = vmlal_lane_s16( voffset2, vget_low_s16( vsrc[0] ), cv, 0 );
  vsum.val[1] = vmlal_lane_s16( voffset2, vget_high_s16( vsrc[0] ), cv, 0 );
  vsum.val[0] = vmlal_lane_s16( vsum.val[0], vget_low_s16( vsrc[1] ), cv, 1 );
  vsum.val[1] = vmlal_lane_s16( vsum.val[1], vget_high_s16( vsrc[1] ), cv, 1 );
  vsum.val[0] = vmlal_lane_s16( vsum.val[0], vget_low_s16( vsrc[2] ), cv, 2 );
  vsum.val[1] = vmlal_lane_s16( vsum.val[1], vget_high_s16( vsrc[2] ), cv, 2 );
  vsum.val[0] = vmlal_lane_s16( vsum.val[0], vget_low_s16( vsrc[3] ), cv, 3 );
  vsum.val[1] = vmlal_lane_s16( vsum.val[1], vget_high_s16( vsrc[3] ), cv, 3 );
  return vsum;
}

static inline int32x4x4_t filter_vert_16x1_N4_neon( int16x8x2_t const vsrc[4], int16x4_t cv, int32x4_t voffset2 )
{
  int32x4x4_t vsum;
  vsum.val[0] = vmlal_lane_s16( voffset2, vget_low_s16( vsrc[0].val[0] ), cv, 0 );
  vsum.val[1] = vmlal_lane_s16( voffset2, vget_high_s16( vsrc[0].val[0] ), cv, 0 );
  vsum.val[2] = vmlal_lane_s16( voffset2, vget_low_s16( vsrc[0].val[1] ), cv, 0 );
  vsum.val[3] = vmlal_lane_s16( voffset2, vget_high_s16( vsrc[0].val[1] ), cv, 0 );
  vsum.val[0] = vmlal_lane_s16( vsum.val[0], vget_low_s16( vsrc[1].val[0] ), cv, 1 );
  vsum.val[1] = vmlal_lane_s16( vsum.val[1], vget_high_s16( vsrc[1].val[0] ), cv, 1 );
  vsum.val[2] = vmlal_lane_s16( vsum.val[2], vget_low_s16( vsrc[1].val[1] ), cv, 1 );
  vsum.val[3] = vmlal_lane_s16( vsum.val[3], vget_high_s16( vsrc[1].val[1] ), cv, 1 );
  vsum.val[0] = vmlal_lane_s16( vsum.val[0], vget_low_s16( vsrc[2].val[0] ), cv, 2 );
  vsum.val[1] = vmlal_lane_s16( vsum.val[1], vget_high_s16( vsrc[2].val[0] ), cv, 2 );
  vsum.val[2] = vmlal_lane_s16( vsum.val[2], vget_low_s16( vsrc[2].val[1] ), cv, 2 );
  vsum.val[3] = vmlal_lane_s16( vsum.val[3], vget_high_s16( vsrc[2].val[1] ), cv, 2 );
  vsum.val[0] = vmlal_lane_s16( vsum.val[0], vget_low_s16( vsrc[3].val[0] ), cv, 3 );
  vsum.val[1] = vmlal_lane_s16( vsum.val[1], vget_high_s16( vsrc[3].val[0] ), cv, 3 );
  vsum.val[2] = vmlal_lane_s16( vsum.val[2], vget_low_s16( vsrc[3].val[1] ), cv, 3 );
  vsum.val[3] = vmlal_lane_s16( vsum.val[3], vget_high_s16( vsrc[3].val[1] ), cv, 3 );
  return vsum;
}

} // namespace vvdec

#endif // defined( TARGET_SIMD_ARM ) && ENABLE_SIMD_OPT_MCIF

//! \}