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/*
* Copyright (c) 2021, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 3-Clause Clear License
* and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear
* License was not distributed with this source code in the LICENSE file, you
* can obtain it at aomedia.org/license/software-license/bsd-3-c-c/. 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
* aomedia.org/license/patent-license/.
*/
#include <arm_neon.h>
#include <assert.h>
#include <math.h>
#include "av1/common/txb_common.h"
#include "av1/encoder/encodetxb.h"
#include "av1/common/arm/mem_neon.h"
void av1_txb_init_levels_neon(const tran_low_t *const coeff, const int width,
const int height, uint8_t *const levels) {
const int stride = width + TX_PAD_HOR;
memset(levels - TX_PAD_TOP * stride, 0,
sizeof(*levels) * TX_PAD_TOP * stride);
memset(levels + stride * height, 0,
sizeof(*levels) * (TX_PAD_BOTTOM * stride + TX_PAD_END));
const int32x4_t zeros = vdupq_n_s32(0);
int i = 0;
uint8_t *ls = levels;
const tran_low_t *cf = coeff;
if (width == 4) {
do {
const int32x4_t coeffA = vld1q_s32(cf);
const int32x4_t coeffB = vld1q_s32(cf + width);
const int16x8_t coeffAB =
vcombine_s16(vqmovn_s32(coeffA), vqmovn_s32(coeffB));
const int16x8_t absAB = vqabsq_s16(coeffAB);
const int8x8_t absABs = vqmovn_s16(absAB);
#if defined(__aarch64__)
const int8x16_t absAB8 =
vcombine_s8(absABs, vreinterpret_s8_s32(vget_low_s32(zeros)));
const uint8x16_t lsAB =
vreinterpretq_u8_s32(vzip1q_s32(vreinterpretq_s32_s8(absAB8), zeros));
#else
const int32x2x2_t absAB8 =
vzip_s32(vreinterpret_s32_s8(absABs), vget_low_s32(zeros));
const uint8x16_t lsAB =
vreinterpretq_u8_s32(vcombine_s32(absAB8.val[0], absAB8.val[1]));
#endif
vst1q_u8(ls, lsAB);
ls += (stride << 1);
cf += (width << 1);
i += 2;
} while (i < height);
} else if (width == 8) {
do {
const int32x4_t coeffA = vld1q_s32(cf);
const int32x4_t coeffB = vld1q_s32(cf + 4);
const int16x8_t coeffAB =
vcombine_s16(vqmovn_s32(coeffA), vqmovn_s32(coeffB));
const int16x8_t absAB = vqabsq_s16(coeffAB);
const uint8x16_t absAB8 = vreinterpretq_u8_s8(vcombine_s8(
vqmovn_s16(absAB), vreinterpret_s8_s32(vget_low_s32(zeros))));
vst1q_u8(ls, absAB8);
ls += stride;
cf += width;
i += 1;
} while (i < height);
} else {
do {
int j = 0;
do {
const int32x4_t coeffA = vld1q_s32(cf);
const int32x4_t coeffB = vld1q_s32(cf + 4);
const int32x4_t coeffC = vld1q_s32(cf + 8);
const int32x4_t coeffD = vld1q_s32(cf + 12);
const int16x8_t coeffAB =
vcombine_s16(vqmovn_s32(coeffA), vqmovn_s32(coeffB));
const int16x8_t coeffCD =
vcombine_s16(vqmovn_s32(coeffC), vqmovn_s32(coeffD));
const int16x8_t absAB = vqabsq_s16(coeffAB);
const int16x8_t absCD = vqabsq_s16(coeffCD);
const uint8x16_t absABCD = vreinterpretq_u8_s8(
vcombine_s8(vqmovn_s16(absAB), vqmovn_s16(absCD)));
vst1q_u8((ls + j), absABCD);
j += 16;
cf += 16;
} while (j < width);
*(int32_t *)(ls + width) = 0;
ls += stride;
i += 1;
} while (i < height);
}
}
// get_4_nz_map_contexts_2d coefficients:
static const DECLARE_ALIGNED(16, uint8_t, c_4_po_2d[2][16]) = {
{ 0, 1, 6, 6, 1, 6, 6, 21, 6, 6, 21, 21, 6, 21, 21, 21 },
{ 0, 11, 11, 11, 11, 11, 11, 11, 6, 6, 21, 21, 6, 21, 21, 21 }
};
// get_4_nz_map_contexts_hor coefficients:
/* clang-format off */
#define SIG_COEF_CONTEXTS_2D_X4_051010 \
(SIG_COEF_CONTEXTS_2D + ((SIG_COEF_CONTEXTS_2D + 5) << 8) + \
((SIG_COEF_CONTEXTS_2D + 10) << 16) + ((SIG_COEF_CONTEXTS_2D + 10) << 24))
/* clang-format on */
// get_4_nz_map_contexts_ver coefficients:
static const DECLARE_ALIGNED(16, uint8_t, c_4_po_ver[16]) = {
SIG_COEF_CONTEXTS_2D + 0, SIG_COEF_CONTEXTS_2D + 0,
SIG_COEF_CONTEXTS_2D + 0, SIG_COEF_CONTEXTS_2D + 0,
SIG_COEF_CONTEXTS_2D + 5, SIG_COEF_CONTEXTS_2D + 5,
SIG_COEF_CONTEXTS_2D + 5, SIG_COEF_CONTEXTS_2D + 5,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10
};
// get_8_coeff_contexts_2d coefficients:
// if (height == 8)
static const DECLARE_ALIGNED(16, uint8_t, c_8_po_2d_8[2][16]) = {
{ 0, 1, 6, 6, 21, 21, 21, 21, 1, 6, 6, 21, 21, 21, 21, 21 },
{ 6, 6, 21, 21, 21, 21, 21, 21, 6, 21, 21, 21, 21, 21, 21, 21 }
};
// if (height < 8)
static const DECLARE_ALIGNED(16, uint8_t, c_8_po_2d_l[2][16]) = {
{ 0, 16, 6, 6, 21, 21, 21, 21, 16, 16, 6, 21, 21, 21, 21, 21 },
{ 16, 16, 21, 21, 21, 21, 21, 21, 16, 16, 21, 21, 21, 21, 21, 21 }
};
// if (height > 8)
static const DECLARE_ALIGNED(16, uint8_t, c_8_po_2d_g[2][16]) = {
{ 0, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11 },
{ 6, 6, 21, 21, 21, 21, 21, 21, 6, 21, 21, 21, 21, 21, 21, 21 }
};
// get_4_nz_map_contexts_ver coefficients:
static const DECLARE_ALIGNED(16, uint8_t, c_8_po_hor[16]) = {
SIG_COEF_CONTEXTS_2D + 0, SIG_COEF_CONTEXTS_2D + 5,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 0, SIG_COEF_CONTEXTS_2D + 5,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10
};
// get_16n_coeff_contexts_2d coefficients:
// real_width == real_height
static const DECLARE_ALIGNED(16, uint8_t, c_16_po_2d_e[4][16]) = {
{ 0, 1, 6, 6, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21 },
{ 1, 6, 6, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21 },
{ 6, 6, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21 },
{ 6, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21 }
};
// real_width > real_height
static const DECLARE_ALIGNED(16, uint8_t, c_16_po_2d_g[3][16]) = {
{ 0, 16, 6, 6, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21 },
{ 16, 16, 6, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21 },
{ 16, 16, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21 }
};
// real_width < real_height
static const DECLARE_ALIGNED(16, uint8_t, c_16_po_2d_l[3][16]) = {
{ 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11 },
{ 6, 6, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21 },
{ 6, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21 }
};
// get_16n_coeff_contexts_hor coefficients:
static const DECLARE_ALIGNED(16, uint8_t, c_16_po_hor[16]) = {
SIG_COEF_CONTEXTS_2D + 0, SIG_COEF_CONTEXTS_2D + 5,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10,
SIG_COEF_CONTEXTS_2D + 10, SIG_COEF_CONTEXTS_2D + 10
};
// end of coefficients declaration area
static INLINE uint8x16_t load_8bit_4x4_to_1_reg(const uint8_t *const src,
const int byte_stride) {
#ifdef __aarch64__
uint32x4_t v_data = vld1q_u32((uint32_t *)src);
v_data = vld1q_lane_u32((uint32_t *)(src + 1 * byte_stride), v_data, 1);
v_data = vld1q_lane_u32((uint32_t *)(src + 2 * byte_stride), v_data, 2);
v_data = vld1q_lane_u32((uint32_t *)(src + 3 * byte_stride), v_data, 3);
return vreinterpretq_u8_u32(v_data);
#else
return load_unaligned_u8q(src, byte_stride);
#endif
}
static INLINE uint8x16_t load_8bit_8x2_to_1_reg(const uint8_t *const src,
const int byte_stride) {
#ifdef __aarch64__
uint64x2_t v_data = vld1q_u64((uint64_t *)src);
v_data = vld1q_lane_u64((uint64_t *)(src + 1 * byte_stride), v_data, 1);
return vreinterpretq_u8_u64(v_data);
#else
uint8x8_t v_data_low = vld1_u8(src);
uint8x8_t v_data_high = vld1_u8(src + byte_stride);
return vcombine_u8(v_data_low, v_data_high);
#endif
}
static INLINE uint8x16_t load_8bit_16x1_to_1_reg(const uint8_t *const src,
const int byte_stride) {
(void)byte_stride;
return vld1q_u8(src);
}
static INLINE void load_levels_4x4x5(const uint8_t *const src, const int stride,
const ptrdiff_t *const offsets,
uint8x16_t *const level) {
level[0] = load_8bit_4x4_to_1_reg(&src[1], stride);
level[1] = load_8bit_4x4_to_1_reg(&src[stride], stride);
level[2] = load_8bit_4x4_to_1_reg(&src[offsets[0]], stride);
level[3] = load_8bit_4x4_to_1_reg(&src[offsets[1]], stride);
level[4] = load_8bit_4x4_to_1_reg(&src[offsets[2]], stride);
}
static INLINE void load_levels_8x2x5(const uint8_t *const src, const int stride,
const ptrdiff_t *const offsets,
uint8x16_t *const level) {
level[0] = load_8bit_8x2_to_1_reg(&src[1], stride);
level[1] = load_8bit_8x2_to_1_reg(&src[stride], stride);
level[2] = load_8bit_8x2_to_1_reg(&src[offsets[0]], stride);
level[3] = load_8bit_8x2_to_1_reg(&src[offsets[1]], stride);
level[4] = load_8bit_8x2_to_1_reg(&src[offsets[2]], stride);
}
static INLINE void load_levels_16x1x5(const uint8_t *const src,
const int stride,
const ptrdiff_t *const offsets,
uint8x16_t *const level) {
level[0] = load_8bit_16x1_to_1_reg(&src[1], stride);
level[1] = load_8bit_16x1_to_1_reg(&src[stride], stride);
level[2] = load_8bit_16x1_to_1_reg(&src[offsets[0]], stride);
level[3] = load_8bit_16x1_to_1_reg(&src[offsets[1]], stride);
level[4] = load_8bit_16x1_to_1_reg(&src[offsets[2]], stride);
}
static INLINE uint8x16_t get_coeff_contexts_kernel(uint8x16_t *const level) {
const uint8x16_t const_3 = vdupq_n_u8(3);
const uint8x16_t const_4 = vdupq_n_u8(4);
uint8x16_t count;
count = vminq_u8(level[0], const_3);
level[1] = vminq_u8(level[1], const_3);
level[2] = vminq_u8(level[2], const_3);
level[3] = vminq_u8(level[3], const_3);
level[4] = vminq_u8(level[4], const_3);
count = vaddq_u8(count, level[1]);
count = vaddq_u8(count, level[2]);
count = vaddq_u8(count, level[3]);
count = vaddq_u8(count, level[4]);
count = vrshrq_n_u8(count, 1);
count = vminq_u8(count, const_4);
return count;
}
static INLINE void get_4_nz_map_contexts_2d(const uint8_t *levels,
const int height,
const ptrdiff_t *const offsets,
uint8_t *const coeff_contexts) {
const int stride = 4 + TX_PAD_HOR;
const uint8x16_t pos_to_offset_large = vdupq_n_u8(21);
uint8x16_t pos_to_offset =
vld1q_u8((height == 4) ? c_4_po_2d[0] : c_4_po_2d[1]);
uint8x16_t count;
uint8x16_t level[5];
uint8_t *cc = coeff_contexts;
assert(!(height % 4));
int row = height;
do {
load_levels_4x4x5(levels, stride, offsets, level);
count = get_coeff_contexts_kernel(level);
count = vaddq_u8(count, pos_to_offset);
vst1q_u8(cc, count);
pos_to_offset = pos_to_offset_large;
levels += 4 * stride;
cc += 16;
row -= 4;
} while (row);
coeff_contexts[0] = 0;
}
static INLINE void get_4_nz_map_contexts_hor(const uint8_t *levels,
const int height,
const ptrdiff_t *const offsets,
uint8_t *coeff_contexts) {
const int stride = 4 + TX_PAD_HOR;
const uint8x16_t pos_to_offset =
vreinterpretq_u8_u32(vdupq_n_u32(SIG_COEF_CONTEXTS_2D_X4_051010));
uint8x16_t count;
uint8x16_t level[5];
assert(!(height % 4));
int row = height;
do {
load_levels_4x4x5(levels, stride, offsets, level);
count = get_coeff_contexts_kernel(level);
count = vaddq_u8(count, pos_to_offset);
vst1q_u8(coeff_contexts, count);
levels += 4 * stride;
coeff_contexts += 16;
row -= 4;
} while (row);
}
static INLINE void get_4_nz_map_contexts_ver(const uint8_t *levels,
const int height,
const ptrdiff_t *const offsets,
uint8_t *coeff_contexts) {
const int stride = 4 + TX_PAD_HOR;
const uint8x16_t pos_to_offset_large = vdupq_n_u8(SIG_COEF_CONTEXTS_2D + 10);
uint8x16_t pos_to_offset = vld1q_u8(c_4_po_ver);
uint8x16_t count;
uint8x16_t level[5];
assert(!(height % 4));
int row = height;
do {
load_levels_4x4x5(levels, stride, offsets, level);
count = get_coeff_contexts_kernel(level);
count = vaddq_u8(count, pos_to_offset);
vst1q_u8(coeff_contexts, count);
pos_to_offset = pos_to_offset_large;
levels += 4 * stride;
coeff_contexts += 16;
row -= 4;
} while (row);
}
static INLINE void get_8_coeff_contexts_2d(const uint8_t *levels,
const int height,
const ptrdiff_t *const offsets,
uint8_t *coeff_contexts) {
const int stride = 8 + TX_PAD_HOR;
uint8_t *cc = coeff_contexts;
uint8x16_t count;
uint8x16_t level[5];
uint8x16_t pos_to_offset[3];
assert(!(height % 2));
if (height == 8) {
pos_to_offset[0] = vld1q_u8(c_8_po_2d_8[0]);
pos_to_offset[1] = vld1q_u8(c_8_po_2d_8[1]);
} else if (height < 8) {
pos_to_offset[0] = vld1q_u8(c_8_po_2d_l[0]);
pos_to_offset[1] = vld1q_u8(c_8_po_2d_l[1]);
} else {
pos_to_offset[0] = vld1q_u8(c_8_po_2d_g[0]);
pos_to_offset[1] = vld1q_u8(c_8_po_2d_g[1]);
}
pos_to_offset[2] = vdupq_n_u8(21);
int row = height;
do {
load_levels_8x2x5(levels, stride, offsets, level);
count = get_coeff_contexts_kernel(level);
count = vaddq_u8(count, pos_to_offset[0]);
vst1q_u8(cc, count);
pos_to_offset[0] = pos_to_offset[1];
pos_to_offset[1] = pos_to_offset[2];
levels += 2 * stride;
cc += 16;
row -= 2;
} while (row);
coeff_contexts[0] = 0;
}
static INLINE void get_8_coeff_contexts_hor(const uint8_t *levels,
const int height,
const ptrdiff_t *const offsets,
uint8_t *coeff_contexts) {
const int stride = 8 + TX_PAD_HOR;
const uint8x16_t pos_to_offset = vld1q_u8(c_8_po_hor);
uint8x16_t count;
uint8x16_t level[5];
assert(!(height % 2));
int row = height;
do {
load_levels_8x2x5(levels, stride, offsets, level);
count = get_coeff_contexts_kernel(level);
count = vaddq_u8(count, pos_to_offset);
vst1q_u8(coeff_contexts, count);
levels += 2 * stride;
coeff_contexts += 16;
row -= 2;
} while (row);
}
static INLINE void get_8_coeff_contexts_ver(const uint8_t *levels,
const int height,
const ptrdiff_t *const offsets,
uint8_t *coeff_contexts) {
const int stride = 8 + TX_PAD_HOR;
const uint8x16_t pos_to_offset_large = vdupq_n_u8(SIG_COEF_CONTEXTS_2D + 10);
uint8x16_t pos_to_offset = vcombine_u8(vdup_n_u8(SIG_COEF_CONTEXTS_2D + 0),
vdup_n_u8(SIG_COEF_CONTEXTS_2D + 5));
uint8x16_t count;
uint8x16_t level[5];
assert(!(height % 2));
int row = height;
do {
load_levels_8x2x5(levels, stride, offsets, level);
count = get_coeff_contexts_kernel(level);
count = vaddq_u8(count, pos_to_offset);
vst1q_u8(coeff_contexts, count);
pos_to_offset = pos_to_offset_large;
levels += 2 * stride;
coeff_contexts += 16;
row -= 2;
} while (row);
}
static INLINE void get_16n_coeff_contexts_2d(const uint8_t *levels,
const int real_width,
const int real_height,
const int width, const int height,
const ptrdiff_t *const offsets,
uint8_t *coeff_contexts) {
const int stride = width + TX_PAD_HOR;
uint8_t *cc = coeff_contexts;
int row = height;
uint8x16_t pos_to_offset[5];
uint8x16_t pos_to_offset_large[3];
uint8x16_t count;
uint8x16_t level[5];
assert(!(width % 16));
pos_to_offset_large[2] = vdupq_n_u8(21);
if (real_width == real_height) {
pos_to_offset[0] = vld1q_u8(c_16_po_2d_e[0]);
pos_to_offset[1] = vld1q_u8(c_16_po_2d_e[1]);
pos_to_offset[2] = vld1q_u8(c_16_po_2d_e[2]);
pos_to_offset[3] = vld1q_u8(c_16_po_2d_e[3]);
pos_to_offset[4] = pos_to_offset_large[0] = pos_to_offset_large[1] =
pos_to_offset_large[2];
} else if (real_width > real_height) {
pos_to_offset[0] = vld1q_u8(c_16_po_2d_g[0]);
pos_to_offset[1] = vld1q_u8(c_16_po_2d_g[1]);
pos_to_offset[2] = pos_to_offset[3] = pos_to_offset[4] =
vld1q_u8(c_16_po_2d_g[2]);
pos_to_offset_large[0] = pos_to_offset_large[1] = pos_to_offset_large[2];
} else { // real_width < real_height
pos_to_offset[0] = pos_to_offset[1] = vld1q_u8(c_16_po_2d_l[0]);
pos_to_offset[2] = vld1q_u8(c_16_po_2d_l[1]);
pos_to_offset[3] = vld1q_u8(c_16_po_2d_l[2]);
pos_to_offset[4] = pos_to_offset_large[2];
pos_to_offset_large[0] = pos_to_offset_large[1] = vdupq_n_u8(11);
}
do {
int w = width;
do {
load_levels_16x1x5(levels, stride, offsets, level);
count = get_coeff_contexts_kernel(level);
count = vaddq_u8(count, pos_to_offset[0]);
vst1q_u8(cc, count);
levels += 16;
cc += 16;
w -= 16;
pos_to_offset[0] = pos_to_offset_large[0];
} while (w);
pos_to_offset[0] = pos_to_offset[1];
pos_to_offset[1] = pos_to_offset[2];
pos_to_offset[2] = pos_to_offset[3];
pos_to_offset[3] = pos_to_offset[4];
pos_to_offset_large[0] = pos_to_offset_large[1];
pos_to_offset_large[1] = pos_to_offset_large[2];
levels += TX_PAD_HOR;
} while (--row);
coeff_contexts[0] = 0;
}
static INLINE void get_16n_coeff_contexts_hor(const uint8_t *levels,
const int width, const int height,
const ptrdiff_t *const offsets,
uint8_t *coeff_contexts) {
const int stride = width + TX_PAD_HOR;
const uint8x16_t pos_to_offset_large = vdupq_n_u8(SIG_COEF_CONTEXTS_2D + 10);
uint8x16_t count;
uint8x16_t level[5];
assert(!(width % 16));
int row = height;
do {
uint8x16_t pos_to_offset = vld1q_u8(c_16_po_hor);
int w = width;
do {
load_levels_16x1x5(levels, stride, offsets, level);
count = get_coeff_contexts_kernel(level);
count = vaddq_u8(count, pos_to_offset);
vst1q_u8(coeff_contexts, count);
pos_to_offset = pos_to_offset_large;
levels += 16;
coeff_contexts += 16;
w -= 16;
} while (w);
levels += TX_PAD_HOR;
} while (--row);
}
static INLINE void get_16n_coeff_contexts_ver(const uint8_t *levels,
const int width, const int height,
const ptrdiff_t *const offsets,
uint8_t *coeff_contexts) {
const int stride = width + TX_PAD_HOR;
uint8x16_t pos_to_offset[3];
uint8x16_t count;
uint8x16_t level[5];
assert(!(width % 16));
pos_to_offset[0] = vdupq_n_u8(SIG_COEF_CONTEXTS_2D + 0);
pos_to_offset[1] = vdupq_n_u8(SIG_COEF_CONTEXTS_2D + 5);
pos_to_offset[2] = vdupq_n_u8(SIG_COEF_CONTEXTS_2D + 10);
int row = height;
do {
int w = width;
do {
load_levels_16x1x5(levels, stride, offsets, level);
count = get_coeff_contexts_kernel(level);
count = vaddq_u8(count, pos_to_offset[0]);
vst1q_u8(coeff_contexts, count);
levels += 16;
coeff_contexts += 16;
w -= 16;
} while (w);
pos_to_offset[0] = pos_to_offset[1];
pos_to_offset[1] = pos_to_offset[2];
levels += TX_PAD_HOR;
} while (--row);
}
// Note: levels[] must be in the range [0, 127], inclusive.
void av1_get_nz_map_contexts_neon(const uint8_t *const levels,
const int16_t *const scan, const uint16_t eob,
const TX_SIZE tx_size,
const TX_CLASS tx_class,
int8_t *const coeff_contexts) {
const int last_idx = eob - 1;
if (!last_idx) {
coeff_contexts[0] = 0;
return;
}
uint8_t *const coefficients = (uint8_t *const)coeff_contexts;
const int real_width = tx_size_wide[tx_size];
const int real_height = tx_size_high[tx_size];
const int width = get_txb_wide(tx_size);
const int height = get_txb_high(tx_size);
const int stride = width + TX_PAD_HOR;
ptrdiff_t offsets[3];
/* coeff_contexts must be 16 byte aligned. */
assert(!((intptr_t)coeff_contexts & 0xf));
if (tx_class == TX_CLASS_2D) {
offsets[0] = 0 * stride + 2;
offsets[1] = 1 * stride + 1;
offsets[2] = 2 * stride + 0;
if (width == 4) {
get_4_nz_map_contexts_2d(levels, height, offsets, coefficients);
} else if (width == 8) {
get_8_coeff_contexts_2d(levels, height, offsets, coefficients);
} else {
get_16n_coeff_contexts_2d(levels, real_width, real_height, width, height,
offsets, coefficients);
}
} else if (tx_class == TX_CLASS_HORIZ) {
offsets[0] = 2;
offsets[1] = 3;
offsets[2] = 4;
if (width == 4) {
get_4_nz_map_contexts_hor(levels, height, offsets, coefficients);
} else if (width == 8) {
get_8_coeff_contexts_hor(levels, height, offsets, coefficients);
} else {
get_16n_coeff_contexts_hor(levels, width, height, offsets, coefficients);
}
} else { // TX_CLASS_VERT
offsets[0] = 2 * stride;
offsets[1] = 3 * stride;
offsets[2] = 4 * stride;
if (width == 4) {
get_4_nz_map_contexts_ver(levels, height, offsets, coefficients);
} else if (width == 8) {
get_8_coeff_contexts_ver(levels, height, offsets, coefficients);
} else {
get_16n_coeff_contexts_ver(levels, width, height, offsets, coefficients);
}
}
const int bwl = get_txb_bwl(tx_size);
const int pos = scan[last_idx];
if (last_idx <= (height << bwl) / 8)
coeff_contexts[pos] = 1;
else if (last_idx <= (height << bwl) / 4)
coeff_contexts[pos] = 2;
else
coeff_contexts[pos] = 3;
}