/*
* Copyright (c) 2024, 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.
*/
#ifndef AOM_AOM_DSP_ARM_AOM_CONVOLVE8_NEON_H_
#define AOM_AOM_DSP_ARM_AOM_CONVOLVE8_NEON_H_
#include <arm_neon.h>
#include "aom_dsp/aom_filter.h"
#include "aom_dsp/arm/mem_neon.h"
#include "config/aom_config.h"
static inline int16x4_t convolve8_4(
const int16x4_t s0,
const int16x4_t s1,
const int16x4_t s2,
const int16x4_t s3,
const int16x4_t s4,
const int16x4_t s5,
const int16x4_t s6,
const int16x4_t s7,
const int16x8_t filter) {
const int16x4_t filter_lo = vget_low_s16(filter);
const int16x4_t filter_hi = vget_high_s16(filter);
int16x4_t sum = vmul_lane_s16(s0, filter_lo, 0);
sum = vmla_lane_s16(sum, s1, filter_lo, 1);
sum = vmla_lane_s16(sum, s2, filter_lo, 2);
sum = vmla_lane_s16(sum, s3, filter_lo, 3);
sum = vmla_lane_s16(sum, s4, filter_hi, 0);
sum = vmla_lane_s16(sum, s5, filter_hi, 1);
sum = vmla_lane_s16(sum, s6, filter_hi, 2);
sum = vmla_lane_s16(sum, s7, filter_hi, 3);
return sum;
}
static inline uint8x8_t convolve8_8(
const int16x8_t s0,
const int16x8_t s1,
const int16x8_t s2,
const int16x8_t s3,
const int16x8_t s4,
const int16x8_t s5,
const int16x8_t s6,
const int16x8_t s7,
const int16x8_t filter) {
const int16x4_t filter_lo = vget_low_s16(filter);
const int16x4_t filter_hi = vget_high_s16(filter);
int16x8_t sum = vmulq_lane_s16(s0, filter_lo, 0);
sum = vmlaq_lane_s16(sum, s1, filter_lo, 1);
sum = vmlaq_lane_s16(sum, s2, filter_lo, 2);
sum = vmlaq_lane_s16(sum, s3, filter_lo, 3);
sum = vmlaq_lane_s16(sum, s4, filter_hi, 0);
sum = vmlaq_lane_s16(sum, s5, filter_hi, 1);
sum = vmlaq_lane_s16(sum, s6, filter_hi, 2);
sum = vmlaq_lane_s16(sum, s7, filter_hi, 3);
// We halved the filter values so -1 from right shift.
return vqrshrun_n_s16(sum, FILTER_BITS - 1);
}
static inline void convolve8_horiz_2tap_neon(
const uint8_t *src,
ptrdiff_t src_stride, uint8_t *dst,
ptrdiff_t dst_stride,
const int16_t *filter_x,
int w,
int h) {
// Bilinear filter values are all positive.
const uint8x8_t f0 = vdup_n_u8((uint8_t)filter_x[3]);
const uint8x8_t f1 = vdup_n_u8((uint8_t)filter_x[4]);
if (w == 4) {
do {
uint8x8_t s0 =
load_unaligned_u8(src + 0 * src_stride + 0, (
int)src_stride);
uint8x8_t s1 =
load_unaligned_u8(src + 0 * src_stride + 1, (
int)src_stride);
uint8x8_t s2 =
load_unaligned_u8(src + 2 * src_stride + 0, (
int)src_stride);
uint8x8_t s3 =
load_unaligned_u8(src + 2 * src_stride + 1, (
int)src_stride);
uint16x8_t sum0 = vmull_u8(s0, f0);
sum0 = vmlal_u8(sum0, s1, f1);
uint16x8_t sum1 = vmull_u8(s2, f0);
sum1 = vmlal_u8(sum1, s3, f1);
uint8x8_t d0 = vqrshrn_n_u16(sum0, FILTER_BITS);
uint8x8_t d1 = vqrshrn_n_u16(sum1, FILTER_BITS);
store_u8x4_strided_x2(dst + 0 * dst_stride, dst_stride, d0);
store_u8x4_strided_x2(dst + 2 * dst_stride, dst_stride, d1);
src += 4 * src_stride;
dst += 4 * dst_stride;
h -= 4;
}
while (h > 0);
}
else if (w == 8) {
do {
uint8x8_t s0 = vld1_u8(src + 0 * src_stride + 0);
uint8x8_t s1 = vld1_u8(src + 0 * src_stride + 1);
uint8x8_t s2 = vld1_u8(src + 1 * src_stride + 0);
uint8x8_t s3 = vld1_u8(src + 1 * src_stride + 1);
uint16x8_t sum0 = vmull_u8(s0, f0);
sum0 = vmlal_u8(sum0, s1, f1);
uint16x8_t sum1 = vmull_u8(s2, f0);
sum1 = vmlal_u8(sum1, s3, f1);
uint8x8_t d0 = vqrshrn_n_u16(sum0, FILTER_BITS);
uint8x8_t d1 = vqrshrn_n_u16(sum1, FILTER_BITS);
vst1_u8(dst + 0 * dst_stride, d0);
vst1_u8(dst + 1 * dst_stride, d1);
src += 2 * src_stride;
dst += 2 * dst_stride;
h -= 2;
}
while (h > 0);
}
else {
do {
int width = w;
const uint8_t *s = src;
uint8_t *d = dst;
do {
uint8x16_t s0 = vld1q_u8(s + 0);
uint8x16_t s1 = vld1q_u8(s + 1);
uint16x8_t sum0 = vmull_u8(vget_low_u8(s0), f0);
sum0 = vmlal_u8(sum0, vget_low_u8(s1), f1);
uint16x8_t sum1 = vmull_u8(vget_high_u8(s0), f0);
sum1 = vmlal_u8(sum1, vget_high_u8(s1), f1);
uint8x8_t d0 = vqrshrn_n_u16(sum0, FILTER_BITS);
uint8x8_t d1 = vqrshrn_n_u16(sum1, FILTER_BITS);
vst1q_u8(d, vcombine_u8(d0, d1));
s += 16;
d += 16;
width -= 16;
}
while (width != 0);
src += src_stride;
dst += dst_stride;
}
while (--h > 0);
}
}
static inline uint8x8_t convolve4_8(
const int16x8_t s0,
const int16x8_t s1,
const int16x8_t s2,
const int16x8_t s3,
const int16x4_t filter) {
int16x8_t sum = vmulq_lane_s16(s0, filter, 0);
sum = vmlaq_lane_s16(sum, s1, filter, 1);
sum = vmlaq_lane_s16(sum, s2, filter, 2);
sum = vmlaq_lane_s16(sum, s3, filter, 3);
// We halved the filter values so -1 from right shift.
return vqrshrun_n_s16(sum, FILTER_BITS - 1);
}
static inline void convolve8_vert_4tap_neon(
const uint8_t *src,
ptrdiff_t src_stride, uint8_t *dst,
ptrdiff_t dst_stride,
const int16_t *filter_y,
int w,
int h) {
// All filter values are even, halve to reduce intermediate precision
// requirements.
const int16x4_t filter = vshr_n_s16(vld1_s16(filter_y + 2), 1);
if (w == 4) {
uint8x8_t t01 = load_unaligned_u8(src + 0 * src_stride, (
int)src_stride);
uint8x8_t t12 = load_unaligned_u8(src + 1 * src_stride, (
int)src_stride);
int16x8_t s01 = vreinterpretq_s16_u16(vmovl_u8(t01));
int16x8_t s12 = vreinterpretq_s16_u16(vmovl_u8(t12));
src += 2 * src_stride;
do {
uint8x8_t t23 = load_unaligned_u8(src + 0 * src_stride, (
int)src_stride);
uint8x8_t t34 = load_unaligned_u8(src + 1 * src_stride, (
int)src_stride);
uint8x8_t t45 = load_unaligned_u8(src + 2 * src_stride, (
int)src_stride);
uint8x8_t t56 = load_unaligned_u8(src + 3 * src_stride, (
int)src_stride);
int16x8_t s23 = vreinterpretq_s16_u16(vmovl_u8(t23));
int16x8_t s34 = vreinterpretq_s16_u16(vmovl_u8(t34));
int16x8_t s45 = vreinterpretq_s16_u16(vmovl_u8(t45));
int16x8_t s56 = vreinterpretq_s16_u16(vmovl_u8(t56));
uint8x8_t d01 = convolve4_8(s01, s12, s23, s34, filter);
uint8x8_t d23 = convolve4_8(s23, s34, s45, s56, filter);
store_u8x4_strided_x2(dst + 0 * dst_stride, dst_stride, d01);
store_u8x4_strided_x2(dst + 2 * dst_stride, dst_stride, d23);
s01 = s45;
s12 = s56;
src += 4 * src_stride;
dst += 4 * dst_stride;
h -= 4;
}
while (h != 0);
}
else {
do {
uint8x8_t t0, t1, t2;
load_u8_8x3(src, src_stride, &t0, &t1, &t2);
int16x8_t s0 = vreinterpretq_s16_u16(vmovl_u8(t0));
int16x8_t s1 = vreinterpretq_s16_u16(vmovl_u8(t1));
int16x8_t s2 = vreinterpretq_s16_u16(vmovl_u8(t2));
int height = h;
const uint8_t *s = src + 3 * src_stride;
uint8_t *d = dst;
do {
uint8x8_t t3;
load_u8_8x4(s, src_stride, &t0, &t1, &t2, &t3);
int16x8_t s3 = vreinterpretq_s16_u16(vmovl_u8(t0));
int16x8_t s4 = vreinterpretq_s16_u16(vmovl_u8(t1));
int16x8_t s5 = vreinterpretq_s16_u16(vmovl_u8(t2));
int16x8_t s6 = vreinterpretq_s16_u16(vmovl_u8(t3));
uint8x8_t d0 = convolve4_8(s0, s1, s2, s3, filter);
uint8x8_t d1 = convolve4_8(s1, s2, s3, s4, filter);
uint8x8_t d2 = convolve4_8(s2, s3, s4, s5, filter);
uint8x8_t d3 = convolve4_8(s3, s4, s5, s6, filter);
store_u8_8x4(d, dst_stride, d0, d1, d2, d3);
s0 = s4;
s1 = s5;
s2 = s6;
s += 4 * src_stride;
d += 4 * dst_stride;
height -= 4;
}
while (height != 0);
src += 8;
dst += 8;
w -= 8;
}
while (w != 0);
}
}
static inline void convolve8_vert_2tap_neon(
const uint8_t *src,
ptrdiff_t src_stride, uint8_t *dst,
ptrdiff_t dst_stride,
const int16_t *filter_y,
int w,
int h) {
// Bilinear filter values are all positive.
uint8x8_t f0 = vdup_n_u8((uint8_t)filter_y[3]);
uint8x8_t f1 = vdup_n_u8((uint8_t)filter_y[4]);
if (w == 4) {
do {
uint8x8_t s0 = load_unaligned_u8(src + 0 * src_stride, (
int)src_stride);
uint8x8_t s1 = load_unaligned_u8(src + 1 * src_stride, (
int)src_stride);
uint8x8_t s2 = load_unaligned_u8(src + 2 * src_stride, (
int)src_stride);
uint8x8_t s3 = load_unaligned_u8(src + 3 * src_stride, (
int)src_stride);
uint16x8_t sum0 = vmull_u8(s0, f0);
sum0 = vmlal_u8(sum0, s1, f1);
uint16x8_t sum1 = vmull_u8(s2, f0);
sum1 = vmlal_u8(sum1, s3, f1);
uint8x8_t d0 = vqrshrn_n_u16(sum0, FILTER_BITS);
uint8x8_t d1 = vqrshrn_n_u16(sum1, FILTER_BITS);
store_u8x4_strided_x2(dst + 0 * dst_stride, dst_stride, d0);
store_u8x4_strided_x2(dst + 2 * dst_stride, dst_stride, d1);
src += 4 * src_stride;
dst += 4 * dst_stride;
h -= 4;
}
while (h > 0);
}
else if (w == 8) {
do {
uint8x8_t s0, s1, s2;
load_u8_8x3(src, src_stride, &s0, &s1, &s2);
uint16x8_t sum0 = vmull_u8(s0, f0);
sum0 = vmlal_u8(sum0, s1, f1);
uint16x8_t sum1 = vmull_u8(s1, f0);
sum1 = vmlal_u8(sum1, s2, f1);
uint8x8_t d0 = vqrshrn_n_u16(sum0, FILTER_BITS);
uint8x8_t d1 = vqrshrn_n_u16(sum1, FILTER_BITS);
vst1_u8(dst + 0 * dst_stride, d0);
vst1_u8(dst + 1 * dst_stride, d1);
src += 2 * src_stride;
dst += 2 * dst_stride;
h -= 2;
}
while (h > 0);
}
else {
do {
int width = w;
const uint8_t *s = src;
uint8_t *d = dst;
do {
uint8x16_t s0 = vld1q_u8(s + 0 * src_stride);
uint8x16_t s1 = vld1q_u8(s + 1 * src_stride);
uint16x8_t sum0 = vmull_u8(vget_low_u8(s0), f0);
sum0 = vmlal_u8(sum0, vget_low_u8(s1), f1);
uint16x8_t sum1 = vmull_u8(vget_high_u8(s0), f0);
sum1 = vmlal_u8(sum1, vget_high_u8(s1), f1);
uint8x8_t d0 = vqrshrn_n_u16(sum0, FILTER_BITS);
uint8x8_t d1 = vqrshrn_n_u16(sum1, FILTER_BITS);
vst1q_u8(d, vcombine_u8(d0, d1));
s += 16;
d += 16;
width -= 16;
}
while (width != 0);
src += src_stride;
dst += dst_stride;
}
while (--h > 0);
}
}
#endif // AOM_AOM_DSP_ARM_AOM_CONVOLVE8_NEON_H_
