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/*
* Copyright (c) 2019, Alliance for Open Media. 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 "config/aom_dsp_rtcd.h"
#include "aom/aom_integer.h"
#include "aom_dsp/arm/sum_neon.h"
#include "av1/common/arm/mem_neon.h"
#include "av1/common/arm/transpose_neon.h"
unsigned int aom_avg_4x4_neon(const uint8_t *a, int a_stride) {
const uint8x16_t b = load_unaligned_u8q(a, a_stride);
const uint16x8_t c = vaddl_u8(vget_low_u8(b), vget_high_u8(b));
#if defined(__aarch64__)
const uint32_t d = vaddlvq_u16(c);
return (d + 8) >> 4;
#else
const uint32x2_t d = horizontal_add_u16x8(c);
return vget_lane_u32(vrshr_n_u32(d, 4), 0);
#endif
}
unsigned int aom_avg_8x8_neon(const uint8_t *a, int a_stride) {
uint16x8_t sum;
uint32x2_t d;
uint8x8_t b = vld1_u8(a);
a += a_stride;
uint8x8_t c = vld1_u8(a);
a += a_stride;
sum = vaddl_u8(b, c);
for (int i = 0; i < 6; ++i) {
const uint8x8_t e = vld1_u8(a);
a += a_stride;
sum = vaddw_u8(sum, e);
}
d = horizontal_add_u16x8(sum);
return vget_lane_u32(vrshr_n_u32(d, 6), 0);
}
int aom_satd_lp_neon(const int16_t *coeff, int length) {
const int16x4_t zero = vdup_n_s16(0);
int32x4_t accum = vdupq_n_s32(0);
do {
const int16x8_t src0 = vld1q_s16(coeff);
const int16x8_t src8 = vld1q_s16(coeff + 8);
accum = vabal_s16(accum, vget_low_s16(src0), zero);
accum = vabal_s16(accum, vget_high_s16(src0), zero);
accum = vabal_s16(accum, vget_low_s16(src8), zero);
accum = vabal_s16(accum, vget_high_s16(src8), zero);
length -= 16;
coeff += 16;
} while (length != 0);
{
// satd: 26 bits, dynamic range [-32640 * 1024, 32640 * 1024]
const int64x2_t s0 = vpaddlq_s32(accum); // cascading summation of 'accum'.
const int32x2_t s1 = vadd_s32(vreinterpret_s32_s64(vget_low_s64(s0)),
vreinterpret_s32_s64(vget_high_s64(s0)));
const int satd = vget_lane_s32(s1, 0);
return satd;
}
}
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