/* -----------------------------------------------------------------------------
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the Software are granted under this license.

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     this list of conditions and the following disclaimer.

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------------------------------------------------------------------------------------------- */

/** \file     mem_neon.h
    \brief    Helper functions for loading and storing vectors
*/

#pragma once

#include "CommonDef.h"
#include <string.h>

#if defined( TARGET_SIMD_ARM )

#include <arm_neon.h>

namespace vvdec
{
// Load helpers
static inline int8x16x2_t load_s8x16_x2( const int8_t* x )
{
  int8x16x2_t ret;
  ret.val[0] = vld1q_s8( x );
  ret.val[1] = vld1q_s8( x + 16 );
  return ret;
}

static inline int16x8x2_t load_s16x8_x2( const int16_t* x )
{
  int16x8x2_t ret;
  ret.val[0] = vld1q_s16( x );
  ret.val[1] = vld1q_s16( x + 8 );
  return ret;
}

static inline int16x4_t load_s16x2( const int16_t* src )
{
  uint32_t tmp;
  memcpy( &tmp, src, sizeof( uint32_t ) );
  return vreinterpret_s16_u32( vset_lane_u32( tmp, vdup_n_u32( 0 ), 0 ) );
}

static inline int16x8_t load_s16x6( const int16_t* src )
{
  int16x8_t ret = vcombine_s16( vld1_s16( src ), vdup_n_s16( 0 ) );
  uint32_t tmp;
  memcpy( &tmp, src + 4, sizeof( uint32_t ) );
  ret = vreinterpretq_s16_u32( vsetq_lane_u32( tmp, vreinterpretq_u32_s16( ret ), 2 ) );
  return ret;
}

static inline int16x4_t load_s16x2x2( const int16_t* src, ptrdiff_t stride )
{
  uint32x2_t ret = vdup_n_u32( 0 );
  uint32_t tmp0, tmp1;
  memcpy( &tmp0, src + 0 * stride, sizeof( uint32_t ) );
  memcpy( &tmp1, src + 1 * stride, sizeof( uint32_t ) );
  ret = vset_lane_u32( tmp0, ret, 0 );
  ret = vset_lane_u32( tmp1, ret, 1 );
  return vreinterpret_s16_u32( ret );
}

// Store helpers
static inline void store_s16x2( int16_t* dst, int16x4_t src )
{
  uint32_t tmp = vget_lane_u32( vreinterpret_u32_s16( src ), 0 );
  memcpy( dst, &tmp, sizeof( uint32_t ) );
}

static inline void store_s16x2x2( int16_t* dst, int16x4_t src, ptrdiff_t stride )
{
  uint32_t tmp0 = vget_lane_u32( vreinterpret_u32_s16( src ), 0 );
  uint32_t tmp1 = vget_lane_u32( vreinterpret_u32_s16( src ), 1 );
  memcpy( dst + 0 * stride, &tmp0, sizeof( uint32_t ) );
  memcpy( dst + 1 * stride, &tmp1, sizeof( uint32_t ) );
}

template<int Lane>
static inline void store_unaligned_u32_4x1( void* dst, uint32x4_t src )
{
  static_assert( Lane >= 0 && Lane < 4, "Lane must be in [0,3]" );
  uint32_t a = vgetq_lane_u32( src, Lane );
  memcpy( dst, &a, sizeof( uint32_t ) );
}

} // namespace vvdec

#endif
