ref: e6509742028631e4a02014cf6fc684eebf39c5d8
dir: /vpx_dsp/arm/sum_squares_neon.c/
/*
* Copyright (c) 2018 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 "./vpx_dsp_rtcd.h"
uint64_t vpx_sum_squares_2d_i16_neon(const int16_t *src, int stride, int size) {
uint64x1_t s2;
if (size == 4) {
int16x4_t s[4];
int32x4_t s0;
uint32x2_t s1;
s[0] = vld1_s16(src + 0 * stride);
s[1] = vld1_s16(src + 1 * stride);
s[2] = vld1_s16(src + 2 * stride);
s[3] = vld1_s16(src + 3 * stride);
s0 = vmull_s16(s[0], s[0]);
s0 = vmlal_s16(s0, s[1], s[1]);
s0 = vmlal_s16(s0, s[2], s[2]);
s0 = vmlal_s16(s0, s[3], s[3]);
s1 = vpadd_u32(vget_low_u32(vreinterpretq_u32_s32(s0)),
vget_high_u32(vreinterpretq_u32_s32(s0)));
s2 = vpaddl_u32(s1);
} else {
int r = size;
uint64x2_t s1 = vdupq_n_u64(0);
do {
int c = size;
int32x4_t s0 = vdupq_n_s32(0);
const int16_t *src_t = src;
do {
int16x8_t s[8];
s[0] = vld1q_s16(src_t + 0 * stride);
s[1] = vld1q_s16(src_t + 1 * stride);
s[2] = vld1q_s16(src_t + 2 * stride);
s[3] = vld1q_s16(src_t + 3 * stride);
s[4] = vld1q_s16(src_t + 4 * stride);
s[5] = vld1q_s16(src_t + 5 * stride);
s[6] = vld1q_s16(src_t + 6 * stride);
s[7] = vld1q_s16(src_t + 7 * stride);
s0 = vmlal_s16(s0, vget_low_s16(s[0]), vget_low_s16(s[0]));
s0 = vmlal_s16(s0, vget_low_s16(s[1]), vget_low_s16(s[1]));
s0 = vmlal_s16(s0, vget_low_s16(s[2]), vget_low_s16(s[2]));
s0 = vmlal_s16(s0, vget_low_s16(s[3]), vget_low_s16(s[3]));
s0 = vmlal_s16(s0, vget_low_s16(s[4]), vget_low_s16(s[4]));
s0 = vmlal_s16(s0, vget_low_s16(s[5]), vget_low_s16(s[5]));
s0 = vmlal_s16(s0, vget_low_s16(s[6]), vget_low_s16(s[6]));
s0 = vmlal_s16(s0, vget_low_s16(s[7]), vget_low_s16(s[7]));
s0 = vmlal_s16(s0, vget_high_s16(s[0]), vget_high_s16(s[0]));
s0 = vmlal_s16(s0, vget_high_s16(s[1]), vget_high_s16(s[1]));
s0 = vmlal_s16(s0, vget_high_s16(s[2]), vget_high_s16(s[2]));
s0 = vmlal_s16(s0, vget_high_s16(s[3]), vget_high_s16(s[3]));
s0 = vmlal_s16(s0, vget_high_s16(s[4]), vget_high_s16(s[4]));
s0 = vmlal_s16(s0, vget_high_s16(s[5]), vget_high_s16(s[5]));
s0 = vmlal_s16(s0, vget_high_s16(s[6]), vget_high_s16(s[6]));
s0 = vmlal_s16(s0, vget_high_s16(s[7]), vget_high_s16(s[7]));
src_t += 8;
c -= 8;
} while (c);
s1 = vaddw_u32(s1, vget_low_u32(vreinterpretq_u32_s32(s0)));
s1 = vaddw_u32(s1, vget_high_u32(vreinterpretq_u32_s32(s0)));
src += 8 * stride;
r -= 8;
} while (r);
s2 = vadd_u64(vget_low_u64(s1), vget_high_u64(s1));
}
return vget_lane_u64(s2, 0);
}