CoCalc -- sharpyuv

GitHub Repository: godotengine/godot
Path: blob/master/thirdparty/libwebp/sharpyuv/sharpyuv_sse2.c
⁹⁸⁹⁸ views
1
// Copyright 2022 Google Inc. All Rights Reserved.
2
//
3
// Use of this source code is governed by a BSD-style license
4
// that can be found in the COPYING file in the root of the source
5
// tree. An additional intellectual property rights grant can be found
6
// in the file PATENTS. All contributing project authors may
7
// be found in the AUTHORS file in the root of the source tree.
8
// -----------------------------------------------------------------------------
9
//
10
// Speed-critical functions for Sharp YUV.
11
//
12
// Author: Skal ([email protected])
13

14
#include "sharpyuv/sharpyuv_dsp.h"
15

16
#if defined(WEBP_USE_SSE2)
17
#include <stdlib.h>
18
#include <emmintrin.h>
19

20
static uint16_t clip_SSE2(int v, int max) {
21
  return (v < 0) ? 0 : (v > max) ? max : (uint16_t)v;
22
}
23

24
static uint64_t SharpYuvUpdateY_SSE2(const uint16_t* ref, const uint16_t* src,
25
                                     uint16_t* dst, int len, int bit_depth) {
26
  const int max_y = (1 << bit_depth) - 1;
27
  uint64_t diff = 0;
28
  uint32_t tmp[4];
29
  int i;
30
  const __m128i zero = _mm_setzero_si128();
31
  const __m128i max = _mm_set1_epi16(max_y);
32
  const __m128i one = _mm_set1_epi16(1);
33
  __m128i sum = zero;
34

35
  for (i = 0; i + 8 <= len; i += 8) {
36
    const __m128i A = _mm_loadu_si128((const __m128i*)(ref + i));
37
    const __m128i B = _mm_loadu_si128((const __m128i*)(src + i));
38
    const __m128i C = _mm_loadu_si128((const __m128i*)(dst + i));
39
    const __m128i D = _mm_sub_epi16(A, B);       // diff_y
40
    const __m128i E = _mm_cmpgt_epi16(zero, D);  // sign (-1 or 0)
41
    const __m128i F = _mm_add_epi16(C, D);       // new_y
42
    const __m128i G = _mm_or_si128(E, one);      // -1 or 1
43
    const __m128i H = _mm_max_epi16(_mm_min_epi16(F, max), zero);
44
    const __m128i I = _mm_madd_epi16(D, G);      // sum(abs(...))
45
    _mm_storeu_si128((__m128i*)(dst + i), H);
46
    sum = _mm_add_epi32(sum, I);
47
  }
48
  _mm_storeu_si128((__m128i*)tmp, sum);
49
  diff = tmp[3] + tmp[2] + tmp[1] + tmp[0];
50
  for (; i < len; ++i) {
51
    const int diff_y = ref[i] - src[i];
52
    const int new_y = (int)dst[i] + diff_y;
53
    dst[i] = clip_SSE2(new_y, max_y);
54
    diff += (uint64_t)abs(diff_y);
55
  }
56
  return diff;
57
}
58

59
static void SharpYuvUpdateRGB_SSE2(const int16_t* ref, const int16_t* src,
60
                                   int16_t* dst, int len) {
61
  int i = 0;
62
  for (i = 0; i + 8 <= len; i += 8) {
63
    const __m128i A = _mm_loadu_si128((const __m128i*)(ref + i));
64
    const __m128i B = _mm_loadu_si128((const __m128i*)(src + i));
65
    const __m128i C = _mm_loadu_si128((const __m128i*)(dst + i));
66
    const __m128i D = _mm_sub_epi16(A, B);   // diff_uv
67
    const __m128i E = _mm_add_epi16(C, D);   // new_uv
68
    _mm_storeu_si128((__m128i*)(dst + i), E);
69
  }
70
  for (; i < len; ++i) {
71
    const int diff_uv = ref[i] - src[i];
72
    dst[i] += diff_uv;
73
  }
74
}
75

76
static void SharpYuvFilterRow16_SSE2(const int16_t* A, const int16_t* B,
77
                                     int len, const uint16_t* best_y,
78
                                     uint16_t* out, int bit_depth) {
79
  const int max_y = (1 << bit_depth) - 1;
80
  int i;
81
  const __m128i kCst8 = _mm_set1_epi16(8);
82
  const __m128i max = _mm_set1_epi16(max_y);
83
  const __m128i zero = _mm_setzero_si128();
84
  for (i = 0; i + 8 <= len; i += 8) {
85
    const __m128i a0 = _mm_loadu_si128((const __m128i*)(A + i + 0));
86
    const __m128i a1 = _mm_loadu_si128((const __m128i*)(A + i + 1));
87
    const __m128i b0 = _mm_loadu_si128((const __m128i*)(B + i + 0));
88
    const __m128i b1 = _mm_loadu_si128((const __m128i*)(B + i + 1));
89
    const __m128i a0b1 = _mm_add_epi16(a0, b1);
90
    const __m128i a1b0 = _mm_add_epi16(a1, b0);
91
    const __m128i a0a1b0b1 = _mm_add_epi16(a0b1, a1b0);  // A0+A1+B0+B1
92
    const __m128i a0a1b0b1_8 = _mm_add_epi16(a0a1b0b1, kCst8);
93
    const __m128i a0b1_2 = _mm_add_epi16(a0b1, a0b1);    // 2*(A0+B1)
94
    const __m128i a1b0_2 = _mm_add_epi16(a1b0, a1b0);    // 2*(A1+B0)
95
    const __m128i c0 = _mm_srai_epi16(_mm_add_epi16(a0b1_2, a0a1b0b1_8), 3);
96
    const __m128i c1 = _mm_srai_epi16(_mm_add_epi16(a1b0_2, a0a1b0b1_8), 3);
97
    const __m128i d0 = _mm_add_epi16(c1, a0);
98
    const __m128i d1 = _mm_add_epi16(c0, a1);
99
    const __m128i e0 = _mm_srai_epi16(d0, 1);
100
    const __m128i e1 = _mm_srai_epi16(d1, 1);
101
    const __m128i f0 = _mm_unpacklo_epi16(e0, e1);
102
    const __m128i f1 = _mm_unpackhi_epi16(e0, e1);
103
    const __m128i g0 = _mm_loadu_si128((const __m128i*)(best_y + 2 * i + 0));
104
    const __m128i g1 = _mm_loadu_si128((const __m128i*)(best_y + 2 * i + 8));
105
    const __m128i h0 = _mm_add_epi16(g0, f0);
106
    const __m128i h1 = _mm_add_epi16(g1, f1);
107
    const __m128i i0 = _mm_max_epi16(_mm_min_epi16(h0, max), zero);
108
    const __m128i i1 = _mm_max_epi16(_mm_min_epi16(h1, max), zero);
109
    _mm_storeu_si128((__m128i*)(out + 2 * i + 0), i0);
110
    _mm_storeu_si128((__m128i*)(out + 2 * i + 8), i1);
111
  }
112
  for (; i < len; ++i) {
113
    //   (9 * A0 + 3 * A1 + 3 * B0 + B1 + 8) >> 4 =
114
    // = (8 * A0 + 2 * (A1 + B0) + (A0 + A1 + B0 + B1 + 8)) >> 4
115
    // We reuse the common sub-expressions.
116
    const int a0b1 = A[i + 0] + B[i + 1];
117
    const int a1b0 = A[i + 1] + B[i + 0];
118
    const int a0a1b0b1 = a0b1 + a1b0 + 8;
119
    const int v0 = (8 * A[i + 0] + 2 * a1b0 + a0a1b0b1) >> 4;
120
    const int v1 = (8 * A[i + 1] + 2 * a0b1 + a0a1b0b1) >> 4;
121
    out[2 * i + 0] = clip_SSE2(best_y[2 * i + 0] + v0, max_y);
122
    out[2 * i + 1] = clip_SSE2(best_y[2 * i + 1] + v1, max_y);
123
  }
124
}
125

126
static WEBP_INLINE __m128i s16_to_s32(__m128i in) {
127
  return _mm_srai_epi32(_mm_unpacklo_epi16(in, in), 16);
128
}
129

130
static void SharpYuvFilterRow32_SSE2(const int16_t* A, const int16_t* B,
131
                                     int len, const uint16_t* best_y,
132
                                     uint16_t* out, int bit_depth) {
133
  const int max_y = (1 << bit_depth) - 1;
134
  int i;
135
  const __m128i kCst8 = _mm_set1_epi32(8);
136
  const __m128i max = _mm_set1_epi16(max_y);
137
  const __m128i zero = _mm_setzero_si128();
138
  for (i = 0; i + 4 <= len; i += 4) {
139
    const __m128i a0 = s16_to_s32(_mm_loadl_epi64((const __m128i*)(A + i + 0)));
140
    const __m128i a1 = s16_to_s32(_mm_loadl_epi64((const __m128i*)(A + i + 1)));
141
    const __m128i b0 = s16_to_s32(_mm_loadl_epi64((const __m128i*)(B + i + 0)));
142
    const __m128i b1 = s16_to_s32(_mm_loadl_epi64((const __m128i*)(B + i + 1)));
143
    const __m128i a0b1 = _mm_add_epi32(a0, b1);
144
    const __m128i a1b0 = _mm_add_epi32(a1, b0);
145
    const __m128i a0a1b0b1 = _mm_add_epi32(a0b1, a1b0);  // A0+A1+B0+B1
146
    const __m128i a0a1b0b1_8 = _mm_add_epi32(a0a1b0b1, kCst8);
147
    const __m128i a0b1_2 = _mm_add_epi32(a0b1, a0b1);  // 2*(A0+B1)
148
    const __m128i a1b0_2 = _mm_add_epi32(a1b0, a1b0);  // 2*(A1+B0)
149
    const __m128i c0 = _mm_srai_epi32(_mm_add_epi32(a0b1_2, a0a1b0b1_8), 3);
150
    const __m128i c1 = _mm_srai_epi32(_mm_add_epi32(a1b0_2, a0a1b0b1_8), 3);
151
    const __m128i d0 = _mm_add_epi32(c1, a0);
152
    const __m128i d1 = _mm_add_epi32(c0, a1);
153
    const __m128i e0 = _mm_srai_epi32(d0, 1);
154
    const __m128i e1 = _mm_srai_epi32(d1, 1);
155
    const __m128i f0 = _mm_unpacklo_epi32(e0, e1);
156
    const __m128i f1 = _mm_unpackhi_epi32(e0, e1);
157
    const __m128i g = _mm_loadu_si128((const __m128i*)(best_y + 2 * i + 0));
158
    const __m128i h_16 = _mm_add_epi16(g, _mm_packs_epi32(f0, f1));
159
    const __m128i final = _mm_max_epi16(_mm_min_epi16(h_16, max), zero);
160
    _mm_storeu_si128((__m128i*)(out + 2 * i + 0), final);
161
  }
162
  for (; i < len; ++i) {
163
    //   (9 * A0 + 3 * A1 + 3 * B0 + B1 + 8) >> 4 =
164
    // = (8 * A0 + 2 * (A1 + B0) + (A0 + A1 + B0 + B1 + 8)) >> 4
165
    // We reuse the common sub-expressions.
166
    const int a0b1 = A[i + 0] + B[i + 1];
167
    const int a1b0 = A[i + 1] + B[i + 0];
168
    const int a0a1b0b1 = a0b1 + a1b0 + 8;
169
    const int v0 = (8 * A[i + 0] + 2 * a1b0 + a0a1b0b1) >> 4;
170
    const int v1 = (8 * A[i + 1] + 2 * a0b1 + a0a1b0b1) >> 4;
171
    out[2 * i + 0] = clip_SSE2(best_y[2 * i + 0] + v0, max_y);
172
    out[2 * i + 1] = clip_SSE2(best_y[2 * i + 1] + v1, max_y);
173
  }
174
}
175

176
static void SharpYuvFilterRow_SSE2(const int16_t* A, const int16_t* B, int len,
177
                                   const uint16_t* best_y, uint16_t* out,
178
                                   int bit_depth) {
179
  if (bit_depth <= 10) {
180
    SharpYuvFilterRow16_SSE2(A, B, len, best_y, out, bit_depth);
181
  } else {
182
    SharpYuvFilterRow32_SSE2(A, B, len, best_y, out, bit_depth);
183
  }
184
}
185

186
//------------------------------------------------------------------------------
187

188
extern void InitSharpYuvSSE2(void);
189

190
WEBP_TSAN_IGNORE_FUNCTION void InitSharpYuvSSE2(void) {
191
  SharpYuvUpdateY = SharpYuvUpdateY_SSE2;
192
  SharpYuvUpdateRGB = SharpYuvUpdateRGB_SSE2;
193
  SharpYuvFilterRow = SharpYuvFilterRow_SSE2;
194
}
195
#else  // !WEBP_USE_SSE2
196

197
extern void InitSharpYuvSSE2(void);
198

199
void InitSharpYuvSSE2(void) {}
200

201
#endif  // WEBP_USE_SSE2
202

203
Product

Resources

Company
