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/*
* Copyright (c) 2016 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 <assert.h>
#include <emmintrin.h>
#include "./vpx_dsp_rtcd.h"
#include "vpx_dsp/x86/mem_sse2.h"
uint64_t vpx_sum_squares_2d_i16_sse2(const int16_t *src, int stride, int size) {
// Over 75% of all calls are with size == 4.
if (size == 4) {
__m128i s[2], sq[2], ss;
s[0] = _mm_loadl_epi64((const __m128i *)(src + 0 * stride));
s[0] = loadh_epi64(s[0], src + 1 * stride);
s[1] = _mm_loadl_epi64((const __m128i *)(src + 2 * stride));
s[1] = loadh_epi64(s[1], src + 3 * stride);
sq[0] = _mm_madd_epi16(s[0], s[0]);
sq[1] = _mm_madd_epi16(s[1], s[1]);
sq[0] = _mm_add_epi32(sq[0], sq[1]);
ss = _mm_add_epi32(sq[0], _mm_srli_si128(sq[0], 8));
ss = _mm_add_epi32(ss, _mm_srli_epi64(ss, 32));
return (uint64_t)_mm_cvtsi128_si32(ss);
} else {
// Generic case
int r = size;
const __m128i v_zext_mask_q = _mm_set_epi32(0, -1, 0, -1);
__m128i v_acc_q = _mm_setzero_si128();
assert(size % 8 == 0);
do {
int c = 0;
__m128i v_acc_d = _mm_setzero_si128();
do {
const int16_t *const b = src + c;
const __m128i v_val_0_w =
_mm_load_si128((const __m128i *)(b + 0 * stride));
const __m128i v_val_1_w =
_mm_load_si128((const __m128i *)(b + 1 * stride));
const __m128i v_val_2_w =
_mm_load_si128((const __m128i *)(b + 2 * stride));
const __m128i v_val_3_w =
_mm_load_si128((const __m128i *)(b + 3 * stride));
const __m128i v_val_4_w =
_mm_load_si128((const __m128i *)(b + 4 * stride));
const __m128i v_val_5_w =
_mm_load_si128((const __m128i *)(b + 5 * stride));
const __m128i v_val_6_w =
_mm_load_si128((const __m128i *)(b + 6 * stride));
const __m128i v_val_7_w =
_mm_load_si128((const __m128i *)(b + 7 * stride));
const __m128i v_sq_0_d = _mm_madd_epi16(v_val_0_w, v_val_0_w);
const __m128i v_sq_1_d = _mm_madd_epi16(v_val_1_w, v_val_1_w);
const __m128i v_sq_2_d = _mm_madd_epi16(v_val_2_w, v_val_2_w);
const __m128i v_sq_3_d = _mm_madd_epi16(v_val_3_w, v_val_3_w);
const __m128i v_sq_4_d = _mm_madd_epi16(v_val_4_w, v_val_4_w);
const __m128i v_sq_5_d = _mm_madd_epi16(v_val_5_w, v_val_5_w);
const __m128i v_sq_6_d = _mm_madd_epi16(v_val_6_w, v_val_6_w);
const __m128i v_sq_7_d = _mm_madd_epi16(v_val_7_w, v_val_7_w);
const __m128i v_sum_01_d = _mm_add_epi32(v_sq_0_d, v_sq_1_d);
const __m128i v_sum_23_d = _mm_add_epi32(v_sq_2_d, v_sq_3_d);
const __m128i v_sum_45_d = _mm_add_epi32(v_sq_4_d, v_sq_5_d);
const __m128i v_sum_67_d = _mm_add_epi32(v_sq_6_d, v_sq_7_d);
const __m128i v_sum_0123_d = _mm_add_epi32(v_sum_01_d, v_sum_23_d);
const __m128i v_sum_4567_d = _mm_add_epi32(v_sum_45_d, v_sum_67_d);
v_acc_d = _mm_add_epi32(v_acc_d, v_sum_0123_d);
v_acc_d = _mm_add_epi32(v_acc_d, v_sum_4567_d);
c += 8;
} while (c < size);
v_acc_q = _mm_add_epi64(v_acc_q, _mm_and_si128(v_acc_d, v_zext_mask_q));
v_acc_q = _mm_add_epi64(v_acc_q, _mm_srli_epi64(v_acc_d, 32));
src += 8 * stride;
r -= 8;
} while (r);
v_acc_q = _mm_add_epi64(v_acc_q, _mm_srli_si128(v_acc_q, 8));
#if VPX_ARCH_X86_64
return (uint64_t)_mm_cvtsi128_si64(v_acc_q);
#else
{
uint64_t tmp;
_mm_storel_epi64((__m128i *)&tmp, v_acc_q);
return tmp;
}
#endif
}
}
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