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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/sum_neon.h"
#define MAX_UPSAMPLE_SZ 16
void av1_highbd_filter_intra_edge_neon(uint16_t *p, int sz, int strength) {
if (!strength) return;
assert(sz >= 0 && sz <= 129);
DECLARE_ALIGNED(16, static const uint16_t,
idx[8]) = { 0, 1, 2, 3, 4, 5, 6, 7 };
const uint16x8_t index = vld1q_u16(idx);
uint16_t edge[160]; // Max value of sz + enough padding for vector accesses.
memcpy(edge + 1, p, sz * sizeof(*p));
// Populate extra space appropriately.
edge[0] = edge[1];
edge[sz + 1] = edge[sz];
edge[sz + 2] = edge[sz];
// Don't overwrite first pixel.
uint16_t *dst = p + 1;
sz--;
if (strength == 1) { // Filter: {4, 8, 4}.
const uint16_t *src = edge + 1;
while (sz >= 8) {
uint16x8_t s0 = vld1q_u16(src);
uint16x8_t s1 = vld1q_u16(src + 1);
uint16x8_t s2 = vld1q_u16(src + 2);
// Make use of the identity:
// (4*a + 8*b + 4*c) >> 4 == (a + (b << 1) + c) >> 2
uint16x8_t t0 = vaddq_u16(s0, s2);
uint16x8_t t1 = vaddq_u16(s1, s1);
uint16x8_t sum = vaddq_u16(t0, t1);
uint16x8_t res = vrshrq_n_u16(sum, 2);
vst1q_u16(dst, res);
src += 8;
dst += 8;
sz -= 8;
}
if (sz > 0) { // Handle sz < 8 to avoid modifying out-of-bounds values.
uint16x8_t s0 = vld1q_u16(src);
uint16x8_t s1 = vld1q_u16(src + 1);
uint16x8_t s2 = vld1q_u16(src + 2);
// Make use of the identity:
// (4*a + 8*b + 4*c) >> 4 == (a + (b << 1) + c) >> 2
uint16x8_t t0 = vaddq_u16(s0, s2);
uint16x8_t t1 = vaddq_u16(s1, s1);
uint16x8_t sum = vaddq_u16(t0, t1);
uint16x8_t res = vrshrq_n_u16(sum, 2);
// Mask off out-of-bounds indices.
uint16x8_t current_dst = vld1q_u16(dst);
uint16x8_t mask = vcgtq_u16(vdupq_n_u16(sz), index);
res = vbslq_u16(mask, res, current_dst);
vst1q_u16(dst, res);
}
} else if (strength == 2) { // Filter: {5, 6, 5}.
const uint16_t *src = edge + 1;
const uint16x8x3_t filter = { { vdupq_n_u16(5), vdupq_n_u16(6),
vdupq_n_u16(5) } };
while (sz >= 8) {
uint16x8_t s0 = vld1q_u16(src);
uint16x8_t s1 = vld1q_u16(src + 1);
uint16x8_t s2 = vld1q_u16(src + 2);
uint16x8_t accum = vmulq_u16(s0, filter.val[0]);
accum = vmlaq_u16(accum, s1, filter.val[1]);
accum = vmlaq_u16(accum, s2, filter.val[2]);
uint16x8_t res = vrshrq_n_u16(accum, 4);
vst1q_u16(dst, res);
src += 8;
dst += 8;
sz -= 8;
}
if (sz > 0) { // Handle sz < 8 to avoid modifying out-of-bounds values.
uint16x8_t s0 = vld1q_u16(src);
uint16x8_t s1 = vld1q_u16(src + 1);
uint16x8_t s2 = vld1q_u16(src + 2);
uint16x8_t accum = vmulq_u16(s0, filter.val[0]);
accum = vmlaq_u16(accum, s1, filter.val[1]);
accum = vmlaq_u16(accum, s2, filter.val[2]);
uint16x8_t res = vrshrq_n_u16(accum, 4);
// Mask off out-of-bounds indices.
uint16x8_t current_dst = vld1q_u16(dst);
uint16x8_t mask = vcgtq_u16(vdupq_n_u16(sz), index);
res = vbslq_u16(mask, res, current_dst);
vst1q_u16(dst, res);
}
} else { // Filter {2, 4, 4, 4, 2}.
const uint16_t *src = edge;
while (sz >= 8) {
uint16x8_t s0 = vld1q_u16(src);
uint16x8_t s1 = vld1q_u16(src + 1);
uint16x8_t s2 = vld1q_u16(src + 2);
uint16x8_t s3 = vld1q_u16(src + 3);
uint16x8_t s4 = vld1q_u16(src + 4);
// Make use of the identity:
// (2*a + 4*b + 4*c + 4*d + 2*e) >> 4 == (a + ((b + c + d) << 1) + e) >> 3
uint16x8_t t0 = vaddq_u16(s0, s4);
uint16x8_t t1 = vaddq_u16(s1, s2);
t1 = vaddq_u16(t1, s3);
t1 = vaddq_u16(t1, t1);
uint16x8_t sum = vaddq_u16(t0, t1);
uint16x8_t res = vrshrq_n_u16(sum, 3);
vst1q_u16(dst, res);
src += 8;
dst += 8;
sz -= 8;
}
if (sz > 0) { // Handle sz < 8 to avoid modifying out-of-bounds values.
uint16x8_t s0 = vld1q_u16(src);
uint16x8_t s1 = vld1q_u16(src + 1);
uint16x8_t s2 = vld1q_u16(src + 2);
uint16x8_t s3 = vld1q_u16(src + 3);
uint16x8_t s4 = vld1q_u16(src + 4);
// Make use of the identity:
// (2*a + 4*b + 4*c + 4*d + 2*e) >> 4 == (a + ((b + c + d) << 1) + e) >> 3
uint16x8_t t0 = vaddq_u16(s0, s4);
uint16x8_t t1 = vaddq_u16(s1, s2);
t1 = vaddq_u16(t1, s3);
t1 = vaddq_u16(t1, t1);
uint16x8_t sum = vaddq_u16(t0, t1);
uint16x8_t res = vrshrq_n_u16(sum, 3);
// Mask off out-of-bounds indices.
uint16x8_t current_dst = vld1q_u16(dst);
uint16x8_t mask = vcgtq_u16(vdupq_n_u16(sz), index);
res = vbslq_u16(mask, res, current_dst);
vst1q_u16(dst, res);
}
}
}
void av1_highbd_upsample_intra_edge_neon(uint16_t *p, int sz, int bd) {
if (!sz) return;
assert(sz <= MAX_UPSAMPLE_SZ);
uint16_t edge[MAX_UPSAMPLE_SZ + 3];
const uint16_t *src = edge;
// Copy p[-1..(sz-1)] and pad out both ends.
edge[0] = p[-1];
edge[1] = p[-1];
memcpy(edge + 2, p, sz * 2);
edge[sz + 2] = p[sz - 1];
p[-2] = p[-1];
uint16x8_t pixel_val_max = vdupq_n_u16((1 << bd) - 1);
uint16_t *dst = p - 1;
if (bd == 12) {
do {
uint16x8_t s0 = vld1q_u16(src);
uint16x8_t s1 = vld1q_u16(src + 1);
uint16x8_t s2 = vld1q_u16(src + 2);
uint16x8_t s3 = vld1q_u16(src + 3);
uint16x8_t t0 = vaddq_u16(s1, s2);
uint16x8_t t1 = vaddq_u16(s0, s3);
uint32x4_t acc0 = vmull_n_u16(vget_low_u16(t0), 9);
acc0 = vqsubq_u32(acc0, vmovl_u16(vget_low_u16(t1)));
uint32x4_t acc1 = vmull_n_u16(vget_high_u16(t0), 9);
acc1 = vqsubq_u32(acc1, vmovl_u16(vget_high_u16(t1)));
uint16x8x2_t res;
res.val[0] = vcombine_u16(vrshrn_n_u32(acc0, 4), vrshrn_n_u32(acc1, 4));
// Clamp pixel values at bitdepth maximum.
res.val[0] = vminq_u16(res.val[0], pixel_val_max);
res.val[1] = s2;
vst2q_u16(dst, res);
src += 8;
dst += 16;
sz -= 8;
} while (sz > 0);
} else { // Bit depth is 8 or 10.
do {
uint16x8_t s0 = vld1q_u16(src);
uint16x8_t s1 = vld1q_u16(src + 1);
uint16x8_t s2 = vld1q_u16(src + 2);
uint16x8_t s3 = vld1q_u16(src + 3);
uint16x8_t t0 = vaddq_u16(s0, s3);
uint16x8_t t1 = vaddq_u16(s1, s2);
t1 = vmulq_n_u16(t1, 9);
t1 = vqsubq_u16(t1, t0);
uint16x8x2_t res;
res.val[0] = vrshrq_n_u16(t1, 4);
// Clamp pixel values at bitdepth maximum.
res.val[0] = vminq_u16(res.val[0], pixel_val_max);
res.val[1] = s2;
vst2q_u16(dst, res);
src += 8;
dst += 16;
sz -= 8;
} while (sz > 0);
}
}
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