ref: d8497e1fcda2a13d9871d2bcae9c52a03498cd69
dir: /vpx_dsp/arm/avg_pred_neon.c/
/*
* Copyright (c) 2017 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 <assert.h>
#include "./vpx_dsp_rtcd.h"
#include "vpx_dsp/arm/mem_neon.h"
void vpx_comp_avg_pred_neon(uint8_t *comp, const uint8_t *pred, int width,
int height, const uint8_t *ref, int ref_stride) {
if (width > 8) {
int x, y;
for (y = 0; y < height; ++y) {
for (x = 0; x < width; x += 16) {
const uint8x16_t p = vld1q_u8(pred + x);
const uint8x16_t r = vld1q_u8(ref + x);
const uint8x16_t avg = vrhaddq_u8(p, r);
vst1q_u8(comp + x, avg);
}
comp += width;
pred += width;
ref += ref_stride;
}
} else {
int i;
for (i = 0; i < width * height; i += 16) {
const uint8x16_t p = vld1q_u8(pred);
uint8x16_t r;
if (width == 4) {
r = load_unaligned_u8q(ref, ref_stride);
ref += 4 * ref_stride;
} else {
const uint8x8_t r_0 = vld1_u8(ref);
const uint8x8_t r_1 = vld1_u8(ref + ref_stride);
assert(width == 8);
r = vcombine_u8(r_0, r_1);
ref += 2 * ref_stride;
}
r = vrhaddq_u8(r, p);
vst1q_u8(comp, r);
pred += 16;
comp += 16;
}
}
}