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/*
* Copyright (c) 2020, 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/aom_integer.h"
#include "aom_dsp/arm/sum_neon.h"
#include "common/tools_common.h"
DECLARE_ALIGNED(16, const int8_t,
av1_filter_intra_taps_neon[FILTER_INTRA_MODES][8][8]) = {
{
{ -6, 0, 0, 0, -5, 10, 0, 0 },
{ 10, 0, 12, 0, 2, 0, 9, 0 },
{ -3, 1, 0, 0, -3, 1, 10, 0 },
{ 1, 10, 7, 0, 1, 2, 5, 0 },
{ -4, 0, 0, 12, -3, 6, 0, 9 },
{ 6, 0, 2, 0, 2, 0, 2, 0 },
{ -3, 2, 0, 7, -3, 2, 6, 5 },
{ 2, 6, 2, 0, 1, 2, 3, 0 },
},
{
{ -10, 0, 0, 0, -6, 16, 0, 0 },
{ 16, 0, 10, 0, 0, 0, 6, 0 },
{ -4, 0, 0, 0, -2, 0, 16, 0 },
{ 0, 16, 4, 0, 0, 0, 2, 0 },
{ -10, 0, 0, 10, -6, 16, 0, 6 },
{ 16, 0, 0, 0, 0, 0, 0, 0 },
{ -4, 0, 0, 4, -2, 0, 16, 2 },
{ 0, 16, 0, 0, 0, 0, 0, 0 },
},
{
{ -8, 0, 0, 0, -8, 8, 0, 0 },
{ 8, 0, 16, 0, 0, 0, 16, 0 },
{ -8, 0, 0, 0, -8, 0, 8, 0 },
{ 0, 8, 16, 0, 0, 0, 16, 0 },
{ -4, 0, 0, 16, -4, 4, 0, 16 },
{ 4, 0, 0, 0, 0, 0, 0, 0 },
{ -4, 0, 0, 16, -4, 0, 4, 16 },
{ 0, 4, 0, 0, 0, 0, 0, 0 },
},
{
{ -2, 0, 0, 0, -1, 8, 0, 0 },
{ 8, 0, 10, 0, 3, 0, 6, 0 },
{ -1, 3, 0, 0, 0, 2, 8, 0 },
{ 2, 8, 4, 0, 1, 3, 2, 0 },
{ -1, 0, 0, 10, -1, 4, 0, 6 },
{ 4, 0, 3, 0, 3, 0, 4, 0 },
{ -1, 3, 0, 4, -1, 2, 4, 3 },
{ 2, 4, 4, 0, 2, 3, 3, 0 },
},
{
{ -12, 0, 0, 0, -10, 14, 0, 0 },
{ 14, 0, 14, 0, 0, 0, 12, 0 },
{ -9, 0, 0, 0, -8, 0, 14, 0 },
{ 0, 14, 11, 0, 0, 0, 10, 0 },
{ -10, 0, 0, 14, -9, 12, 0, 12 },
{ 12, 0, 0, 0, 1, 0, 0, 0 },
{ -8, 0, 0, 11, -7, 0, 12, 9 },
{ 0, 12, 1, 0, 0, 1, 1, 0 },
},
};
#define FILTER_INTRA_SCALE_BITS 4
#define SHIFT_INTRA_SCALE_BITS 15 - FILTER_INTRA_SCALE_BITS
#define MASK_LOW \
0x604020006040200 // (0 | (2 << 8) | (4 << 16) | (6 << 24)) x 2
#define MASK_HIGH \
0x705030107050301 // (1 | (3 << 8) | (5 << 16) | (7 << 24)) x 2
void av1_filter_intra_predictor_neon(uint8_t *dst, ptrdiff_t stride,
TX_SIZE tx_size, const uint8_t *above,
const uint8_t *left, int mode) {
int r, c;
uint8_t buffer[33][33];
const int bw = tx_size_wide[tx_size];
const int bh = tx_size_high[tx_size];
const int8x16_t f1f0 = vld1q_s8(av1_filter_intra_taps_neon[mode][0]);
const int8x16_t f3f2 = vld1q_s8(av1_filter_intra_taps_neon[mode][2]);
const int8x16_t f5f4 = vld1q_s8(av1_filter_intra_taps_neon[mode][4]);
const int8x16_t f7f6 = vld1q_s8(av1_filter_intra_taps_neon[mode][6]);
const int16x8_t f1f0_lo = vmovl_s8(vget_low_s8(f1f0));
const int16x8_t f1f0_hi = vmovl_s8(vget_high_s8(f1f0));
const int16x8_t f3f2_lo = vmovl_s8(vget_low_s8(f3f2));
const int16x8_t f3f2_hi = vmovl_s8(vget_high_s8(f3f2));
const int16x8_t f5f4_lo = vmovl_s8(vget_low_s8(f5f4));
const int16x8_t f5f4_hi = vmovl_s8(vget_high_s8(f5f4));
const int16x8_t f7f6_lo = vmovl_s8(vget_low_s8(f7f6));
const int16x8_t f7f6_hi = vmovl_s8(vget_high_s8(f7f6));
const uint8x8_t vmask_low = vcreate_u8(MASK_LOW);
const uint8x8_t vmask_high = vcreate_u8(MASK_HIGH);
assert(bw <= 32 && bh <= 32);
// The initialization is just for silencing Jenkins static analysis warnings
for (r = 0; r < bh + 1; ++r)
memset(buffer[r], 0, (bw + 1) * sizeof(buffer[0][0]));
for (r = 0; r < bh; ++r) buffer[r + 1][0] = left[r];
memcpy(buffer[0], &above[-1], (bw + 1) * sizeof(uint8_t));
for (r = 1; r < bh + 1; r += 2) {
for (c = 1; c < bw + 1; c += 4) {
DECLARE_ALIGNED(16, uint8_t, p[8]);
memcpy(p, &buffer[r - 1][c - 1], 5 * sizeof(uint8_t));
p[5] = buffer[r][c - 1];
p[6] = buffer[r + 1][c - 1];
p[7] = 0;
const uint8x8_t p_b = vld1_u8(p);
const uint16x8_t p_b_lo = vmovl_u8(vtbl1_u8(p_b, vmask_low));
const uint16x8_t p_b_hi = vmovl_u8(vtbl1_u8(p_b, vmask_high));
int16x8_t out_01 = vmulq_s16(vreinterpretq_s16_u16(p_b_lo), f1f0_lo);
out_01 = vmlaq_s16(out_01, vreinterpretq_s16_u16(p_b_hi), f1f0_hi);
int16x8_t out_23 = vmulq_s16(vreinterpretq_s16_u16(p_b_lo), f3f2_lo);
out_23 = vmlaq_s16(out_23, vreinterpretq_s16_u16(p_b_hi), f3f2_hi);
int16x8_t out_45 = vmulq_s16(vreinterpretq_s16_u16(p_b_lo), f5f4_lo);
out_45 = vmlaq_s16(out_45, vreinterpretq_s16_u16(p_b_hi), f5f4_hi);
int16x8_t out_67 = vmulq_s16(vreinterpretq_s16_u16(p_b_lo), f7f6_lo);
out_67 = vmlaq_s16(out_67, vreinterpretq_s16_u16(p_b_hi), f7f6_hi);
#if defined(__aarch64__)
const int16x8_t out_0123 = vpaddq_s16(out_01, out_23);
const int16x8_t out_4567 = vpaddq_s16(out_45, out_67);
const int16x8_t out_01234567 = vpaddq_s16(out_0123, out_4567);
#else
const int16x8_t out_0123 = vcombine_s16(vqmovn_s32(vpaddlq_s16(out_01)),
vqmovn_s32(vpaddlq_s16(out_23)));
const int16x8_t out_4567 = vcombine_s16(vqmovn_s32(vpaddlq_s16(out_45)),
vqmovn_s32(vpaddlq_s16(out_67)));
const int16x8_t out_01234567 = vcombine_s16(
vqmovn_s32(vpaddlq_s16(out_0123)), vqmovn_s32(vpaddlq_s16(out_4567)));
#endif // (__aarch64__)
const uint32x2_t out_r =
vreinterpret_u32_u8(vqmovun_s16(vrshrq_n_s16(out_01234567, 4)));
// Storing
vst1_lane_u32((uint32_t *)&buffer[r][c], out_r, 0);
vst1_lane_u32((uint32_t *)&buffer[r + 1][c], out_r, 1);
}
}
for (r = 0; r < bh; ++r) {
memcpy(dst, &buffer[r + 1][1], bw * sizeof(uint8_t));
dst += stride;
}
}