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/*
* Copyright (c) 2023, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#include <arm_neon.h>
#include <assert.h>
#include "aom_dsp/arm/mem_neon.h"
#include "aom_dsp/arm/sum_neon.h"
#include "config/aom_dsp_rtcd.h"
static INLINE uint64_t aom_var_2d_u8_4xh_neon_dotprod(uint8_t *src,
int src_stride, int width,
int height) {
uint64_t sum = 0;
uint64_t sse = 0;
uint32x2_t sum_u32 = vdup_n_u32(0);
uint32x2_t sse_u32 = vdup_n_u32(0);
int h = height / 2;
do {
int w = width;
uint8_t *src_ptr = src;
do {
uint8x8_t s0 = load_unaligned_u8(src_ptr, src_stride);
sum_u32 = vdot_u32(sum_u32, s0, vdup_n_u8(1));
sse_u32 = vdot_u32(sse_u32, s0, s0);
src_ptr += 8;
w -= 8;
} while (w >= 8);
// Process remaining columns in the row using C.
while (w > 0) {
int idx = width - w;
const uint8_t v = src[idx];
sum += v;
sse += v * v;
w--;
}
src += 2 * src_stride;
} while (--h != 0);
sum += horizontal_long_add_u32x2(sum_u32);
sse += horizontal_long_add_u32x2(sse_u32);
return sse - sum * sum / (width * height);
}
static INLINE uint64_t aom_var_2d_u8_8xh_neon_dotprod(uint8_t *src,
int src_stride, int width,
int height) {
uint64_t sum = 0;
uint64_t sse = 0;
uint32x2_t sum_u32 = vdup_n_u32(0);
uint32x2_t sse_u32 = vdup_n_u32(0);
int h = height;
do {
int w = width;
uint8_t *src_ptr = src;
do {
uint8x8_t s0 = vld1_u8(src_ptr);
sum_u32 = vdot_u32(sum_u32, s0, vdup_n_u8(1));
sse_u32 = vdot_u32(sse_u32, s0, s0);
src_ptr += 8;
w -= 8;
} while (w >= 8);
// Process remaining columns in the row using C.
while (w > 0) {
int idx = width - w;
const uint8_t v = src[idx];
sum += v;
sse += v * v;
w--;
}
src += src_stride;
} while (--h != 0);
sum += horizontal_long_add_u32x2(sum_u32);
sse += horizontal_long_add_u32x2(sse_u32);
return sse - sum * sum / (width * height);
}
static INLINE uint64_t aom_var_2d_u8_16xh_neon_dotprod(uint8_t *src,
int src_stride,
int width, int height) {
uint64_t sum = 0;
uint64_t sse = 0;
uint32x4_t sum_u32 = vdupq_n_u32(0);
uint32x4_t sse_u32 = vdupq_n_u32(0);
int h = height;
do {
int w = width;
uint8_t *src_ptr = src;
do {
uint8x16_t s0 = vld1q_u8(src_ptr);
sum_u32 = vdotq_u32(sum_u32, s0, vdupq_n_u8(1));
sse_u32 = vdotq_u32(sse_u32, s0, s0);
src_ptr += 16;
w -= 16;
} while (w >= 16);
// Process remaining columns in the row using C.
while (w > 0) {
int idx = width - w;
const uint8_t v = src[idx];
sum += v;
sse += v * v;
w--;
}
src += src_stride;
} while (--h != 0);
sum += horizontal_long_add_u32x4(sum_u32);
sse += horizontal_long_add_u32x4(sse_u32);
return sse - sum * sum / (width * height);
}
uint64_t aom_var_2d_u8_neon_dotprod(uint8_t *src, int src_stride, int width,
int height) {
if (width >= 16) {
return aom_var_2d_u8_16xh_neon_dotprod(src, src_stride, width, height);
}
if (width >= 8) {
return aom_var_2d_u8_8xh_neon_dotprod(src, src_stride, width, height);
}
if (width >= 4 && height % 2 == 0) {
return aom_var_2d_u8_4xh_neon_dotprod(src, src_stride, width, height);
}
return aom_var_2d_u8_c(src, src_stride, width, height);
}
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