1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/*
* 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 <assert.h>
#include <emmintrin.h>
#include <stdio.h>
#include "./vpx_dsp_rtcd.h"
#include "vpx/vpx_integer.h"
#include "vpx_dsp/x86/mem_sse2.h"
extern const int16_t vpx_rv[];
void vpx_mbpost_proc_down_sse2(unsigned char *dst, int pitch, int rows,
int cols, int flimit) {
int col;
const __m128i zero = _mm_setzero_si128();
const __m128i f = _mm_set1_epi32(flimit);
DECLARE_ALIGNED(16, int16_t, above_context[8 * 8]);
// 8 columns are processed at a time.
// If rows is less than 8 the bottom border extension fails.
assert(cols % 8 == 0);
assert(rows >= 8);
for (col = 0; col < cols; col += 8) {
int row, i;
__m128i s = _mm_loadl_epi64((__m128i *)dst);
__m128i sum, sumsq_0, sumsq_1;
__m128i tmp_0, tmp_1;
__m128i below_context = _mm_setzero_si128();
s = _mm_unpacklo_epi8(s, zero);
for (i = 0; i < 8; ++i) {
_mm_store_si128((__m128i *)above_context + i, s);
}
// sum *= 9
sum = _mm_slli_epi16(s, 3);
sum = _mm_add_epi16(s, sum);
// sum^2 * 9 == (sum * 9) * sum
tmp_0 = _mm_mullo_epi16(sum, s);
tmp_1 = _mm_mulhi_epi16(sum, s);
sumsq_0 = _mm_unpacklo_epi16(tmp_0, tmp_1);
sumsq_1 = _mm_unpackhi_epi16(tmp_0, tmp_1);
// Prime sum/sumsq
for (i = 1; i <= 6; ++i) {
__m128i a = _mm_loadl_epi64((__m128i *)(dst + i * pitch));
a = _mm_unpacklo_epi8(a, zero);
sum = _mm_add_epi16(sum, a);
a = _mm_mullo_epi16(a, a);
sumsq_0 = _mm_add_epi32(sumsq_0, _mm_unpacklo_epi16(a, zero));
sumsq_1 = _mm_add_epi32(sumsq_1, _mm_unpackhi_epi16(a, zero));
}
for (row = 0; row < rows + 8; row++) {
const __m128i above =
_mm_load_si128((__m128i *)above_context + (row & 7));
__m128i this_row = _mm_loadl_epi64((__m128i *)(dst + row * pitch));
__m128i above_sq, below_sq;
__m128i mask_0, mask_1;
__m128i multmp_0, multmp_1;
__m128i rv;
__m128i out;
this_row = _mm_unpacklo_epi8(this_row, zero);
if (row + 7 < rows) {
// Instead of copying the end context we just stop loading when we get
// to the last one.
below_context = _mm_loadl_epi64((__m128i *)(dst + (row + 7) * pitch));
below_context = _mm_unpacklo_epi8(below_context, zero);
}
sum = _mm_sub_epi16(sum, above);
sum = _mm_add_epi16(sum, below_context);
// context^2 fits in 16 bits. Don't need to mulhi and combine. Just zero
// extend. Unfortunately we can't do below_sq - above_sq in 16 bits
// because x86 does not have unpack with sign extension.
above_sq = _mm_mullo_epi16(above, above);
sumsq_0 = _mm_sub_epi32(sumsq_0, _mm_unpacklo_epi16(above_sq, zero));
sumsq_1 = _mm_sub_epi32(sumsq_1, _mm_unpackhi_epi16(above_sq, zero));
below_sq = _mm_mullo_epi16(below_context, below_context);
sumsq_0 = _mm_add_epi32(sumsq_0, _mm_unpacklo_epi16(below_sq, zero));
sumsq_1 = _mm_add_epi32(sumsq_1, _mm_unpackhi_epi16(below_sq, zero));
// sumsq * 16 - sumsq == sumsq * 15
mask_0 = _mm_slli_epi32(sumsq_0, 4);
mask_0 = _mm_sub_epi32(mask_0, sumsq_0);
mask_1 = _mm_slli_epi32(sumsq_1, 4);
mask_1 = _mm_sub_epi32(mask_1, sumsq_1);
multmp_0 = _mm_mullo_epi16(sum, sum);
multmp_1 = _mm_mulhi_epi16(sum, sum);
mask_0 = _mm_sub_epi32(mask_0, _mm_unpacklo_epi16(multmp_0, multmp_1));
mask_1 = _mm_sub_epi32(mask_1, _mm_unpackhi_epi16(multmp_0, multmp_1));
// mask - f gives a negative value when mask < f
mask_0 = _mm_sub_epi32(mask_0, f);
mask_1 = _mm_sub_epi32(mask_1, f);
// Shift the sign bit down to create a mask
mask_0 = _mm_srai_epi32(mask_0, 31);
mask_1 = _mm_srai_epi32(mask_1, 31);
mask_0 = _mm_packs_epi32(mask_0, mask_1);
rv = _mm_loadu_si128((__m128i const *)(vpx_rv + (row & 127)));
mask_1 = _mm_add_epi16(rv, sum);
mask_1 = _mm_add_epi16(mask_1, this_row);
mask_1 = _mm_srai_epi16(mask_1, 4);
mask_1 = _mm_and_si128(mask_0, mask_1);
mask_0 = _mm_andnot_si128(mask_0, this_row);
out = _mm_or_si128(mask_1, mask_0);
_mm_storel_epi64((__m128i *)(dst + row * pitch),
_mm_packus_epi16(out, zero));
_mm_store_si128((__m128i *)above_context + ((row + 8) & 7), this_row);
}
dst += 8;
}
}
|
