shithub: libvpx

ref: 6dcd9b37eafa9f333efbcdc4c33e4e5d11480521
dir: /vp8/common/arm/neon/dc_only_idct_add_neon.c/

/*
 *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include <arm_neon.h>

#include "./vp8_rtcd.h"

void vp8_dc_only_idct_add_neon(int16_t input_dc, unsigned char *pred_ptr,
                               int pred_stride, unsigned char *dst_ptr,
                               int dst_stride) {
  int i;
  uint16_t a1 = ((input_dc + 4) >> 3);
  uint32x2_t d2u32 = vdup_n_u32(0);
  uint8x8_t d2u8;
  uint16x8_t q1u16;
  uint16x8_t qAdd;

  qAdd = vdupq_n_u16(a1);

  for (i = 0; i < 2; ++i) {
    d2u32 = vld1_lane_u32((const uint32_t *)pred_ptr, d2u32, 0);
    pred_ptr += pred_stride;
    d2u32 = vld1_lane_u32((const uint32_t *)pred_ptr, d2u32, 1);
    pred_ptr += pred_stride;

    q1u16 = vaddw_u8(qAdd, vreinterpret_u8_u32(d2u32));
    d2u8 = vqmovun_s16(vreinterpretq_s16_u16(q1u16));

    vst1_lane_u32((uint32_t *)dst_ptr, vreinterpret_u32_u8(d2u8), 0);
    dst_ptr += dst_stride;
    vst1_lane_u32((uint32_t *)dst_ptr, vreinterpret_u32_u8(d2u8), 1);
    dst_ptr += dst_stride;
  }
}