ref: c7f58bcc70f0d8fb7ff48c115f53f78165d26792
dir: /vp9/encoder/arm/neon/vp9_avg_neon.c/
/*
* Copyright (c) 2015 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 "./vp9_rtcd.h"
#include "./vpx_config.h"
#include "vpx/vpx_integer.h"
static INLINE unsigned int horizontal_add_u16x8(const uint16x8_t v_16x8) {
const uint32x4_t a = vpaddlq_u16(v_16x8);
const uint64x2_t b = vpaddlq_u32(a);
const uint32x2_t c = vadd_u32(vreinterpret_u32_u64(vget_low_u64(b)),
vreinterpret_u32_u64(vget_high_u64(b)));
return vget_lane_u32(c, 0);
}
unsigned int vp9_avg_8x8_neon(const uint8_t *s, int p) {
uint8x8_t v_s0 = vld1_u8(s);
const uint8x8_t v_s1 = vld1_u8(s + p);
uint16x8_t v_sum = vaddl_u8(v_s0, v_s1);
v_s0 = vld1_u8(s + 2 * p);
v_sum = vaddw_u8(v_sum, v_s0);
v_s0 = vld1_u8(s + 3 * p);
v_sum = vaddw_u8(v_sum, v_s0);
v_s0 = vld1_u8(s + 4 * p);
v_sum = vaddw_u8(v_sum, v_s0);
v_s0 = vld1_u8(s + 5 * p);
v_sum = vaddw_u8(v_sum, v_s0);
v_s0 = vld1_u8(s + 6 * p);
v_sum = vaddw_u8(v_sum, v_s0);
v_s0 = vld1_u8(s + 7 * p);
v_sum = vaddw_u8(v_sum, v_s0);
return (horizontal_add_u16x8(v_sum) + 32) >> 6;
}
void vp9_int_pro_row_neon(int16_t hbuf[16], uint8_t const *ref,
const int ref_stride, const int height) {
int i;
uint16x8_t vec_sum_lo = vdupq_n_u16(0);
uint16x8_t vec_sum_hi = vdupq_n_u16(0);
const int shift_factor = ((height >> 5) + 3) * -1;
const int16x8_t vec_shift = vdupq_n_s16(shift_factor);
for (i = 0; i < height; i += 8) {
const uint8x16_t vec_row1 = vld1q_u8(ref);
const uint8x16_t vec_row2 = vld1q_u8(ref + ref_stride);
const uint8x16_t vec_row3 = vld1q_u8(ref + ref_stride * 2);
const uint8x16_t vec_row4 = vld1q_u8(ref + ref_stride * 3);
const uint8x16_t vec_row5 = vld1q_u8(ref + ref_stride * 4);
const uint8x16_t vec_row6 = vld1q_u8(ref + ref_stride * 5);
const uint8x16_t vec_row7 = vld1q_u8(ref + ref_stride * 6);
const uint8x16_t vec_row8 = vld1q_u8(ref + ref_stride * 7);
vec_sum_lo = vaddw_u8(vec_sum_lo, vget_low_u8(vec_row1));
vec_sum_hi = vaddw_u8(vec_sum_hi, vget_high_u8(vec_row1));
vec_sum_lo = vaddw_u8(vec_sum_lo, vget_low_u8(vec_row2));
vec_sum_hi = vaddw_u8(vec_sum_hi, vget_high_u8(vec_row2));
vec_sum_lo = vaddw_u8(vec_sum_lo, vget_low_u8(vec_row3));
vec_sum_hi = vaddw_u8(vec_sum_hi, vget_high_u8(vec_row3));
vec_sum_lo = vaddw_u8(vec_sum_lo, vget_low_u8(vec_row4));
vec_sum_hi = vaddw_u8(vec_sum_hi, vget_high_u8(vec_row4));
vec_sum_lo = vaddw_u8(vec_sum_lo, vget_low_u8(vec_row5));
vec_sum_hi = vaddw_u8(vec_sum_hi, vget_high_u8(vec_row5));
vec_sum_lo = vaddw_u8(vec_sum_lo, vget_low_u8(vec_row6));
vec_sum_hi = vaddw_u8(vec_sum_hi, vget_high_u8(vec_row6));
vec_sum_lo = vaddw_u8(vec_sum_lo, vget_low_u8(vec_row7));
vec_sum_hi = vaddw_u8(vec_sum_hi, vget_high_u8(vec_row7));
vec_sum_lo = vaddw_u8(vec_sum_lo, vget_low_u8(vec_row8));
vec_sum_hi = vaddw_u8(vec_sum_hi, vget_high_u8(vec_row8));
ref += ref_stride * 8;
}
vec_sum_lo = vshlq_u16(vec_sum_lo, vec_shift);
vec_sum_hi = vshlq_u16(vec_sum_hi, vec_shift);
vst1q_s16(hbuf, vreinterpretq_s16_u16(vec_sum_lo));
hbuf += 8;
vst1q_s16(hbuf, vreinterpretq_s16_u16(vec_sum_hi));
}
int16_t vp9_int_pro_col_neon(uint8_t const *ref, const int width) {
int i;
uint16x8_t vec_sum = vdupq_n_u16(0);
for (i = 0; i < width; i += 16) {
const uint8x16_t vec_row = vld1q_u8(ref);
vec_sum = vaddw_u8(vec_sum, vget_low_u8(vec_row));
vec_sum = vaddw_u8(vec_sum, vget_high_u8(vec_row));
ref += 16;
}
return horizontal_add_u16x8(vec_sum);
}
// ref, src = [0, 510] - max diff = 16-bits
// bwl = {2, 3, 4}, width = {16, 32, 64}
int vp9_vector_var_neon(int16_t const *ref, int16_t const *src, const int bwl) {
int width = 4 << bwl;
int32x4_t sse = vdupq_n_s32(0);
int16x8_t total = vdupq_n_s16(0);
assert(width >= 8);
assert((width % 8) == 0);
do {
const int16x8_t r = vld1q_s16(ref);
const int16x8_t s = vld1q_s16(src);
const int16x8_t diff = vsubq_s16(r, s); // [-510, 510], 10 bits.
const int16x4_t diff_lo = vget_low_s16(diff);
const int16x4_t diff_hi = vget_high_s16(diff);
sse = vmlal_s16(sse, diff_lo, diff_lo); // dynamic range 26 bits.
sse = vmlal_s16(sse, diff_hi, diff_hi);
total = vaddq_s16(total, diff); // dynamic range 16 bits.
ref += 8;
src += 8;
width -= 8;
} while (width != 0);
{
// Note: 'total''s pairwise addition could be implemented similarly to
// horizontal_add_u16x8(), but one less vpaddl with 'total' when paired
// with the summation of 'sse' performed better on a Cortex-A15.
const int32x4_t t0 = vpaddlq_s16(total); // cascading summation of 'total'
const int32x2_t t1 = vadd_s32(vget_low_s32(t0), vget_high_s32(t0));
const int32x2_t t2 = vpadd_s32(t1, t1);
const int t = vget_lane_s32(t2, 0);
const int64x2_t s0 = vpaddlq_s32(sse); // cascading summation of 'sse'.
const int32x2_t s1 = vadd_s32(vreinterpret_s32_s64(vget_low_s64(s0)),
vreinterpret_s32_s64(vget_high_s64(s0)));
const int s = vget_lane_s32(s1, 0);
const int shift_factor = bwl + 2;
return s - ((t * t) >> shift_factor);
}
}