summaryrefslogtreecommitdiffstats
path: root/media/libjpeg/simd/powerpc/jfdctint-altivec.c
blob: 3d4f017103d5545375b9366557403742b1aff242 (plain)
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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/*
 * AltiVec optimizations for libjpeg-turbo
 *
 * Copyright (C) 2014, 2020, D. R. Commander.  All Rights Reserved.
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */

/* ACCURATE INTEGER FORWARD DCT */

#include "jsimd_altivec.h"


#define F_0_298  2446   /* FIX(0.298631336) */
#define F_0_390  3196   /* FIX(0.390180644) */
#define F_0_541  4433   /* FIX(0.541196100) */
#define F_0_765  6270   /* FIX(0.765366865) */
#define F_0_899  7373   /* FIX(0.899976223) */
#define F_1_175  9633   /* FIX(1.175875602) */
#define F_1_501  12299  /* FIX(1.501321110) */
#define F_1_847  15137  /* FIX(1.847759065) */
#define F_1_961  16069  /* FIX(1.961570560) */
#define F_2_053  16819  /* FIX(2.053119869) */
#define F_2_562  20995  /* FIX(2.562915447) */
#define F_3_072  25172  /* FIX(3.072711026) */

#define CONST_BITS  13
#define PASS1_BITS  2
#define DESCALE_P1  (CONST_BITS - PASS1_BITS)
#define DESCALE_P2  (CONST_BITS + PASS1_BITS)


#define DO_FDCT_COMMON(PASS) { \
  /* (Original) \
   * z1 = (tmp12 + tmp13) * 0.541196100; \
   * data2 = z1 + tmp13 * 0.765366865; \
   * data6 = z1 + tmp12 * -1.847759065; \
   * \
   * (This implementation) \
   * data2 = tmp13 * (0.541196100 + 0.765366865) + tmp12 * 0.541196100; \
   * data6 = tmp13 * 0.541196100 + tmp12 * (0.541196100 - 1.847759065); \
   */ \
  \
  tmp1312l = vec_mergeh(tmp13, tmp12); \
  tmp1312h = vec_mergel(tmp13, tmp12); \
  \
  out2l = vec_msums(tmp1312l, pw_f130_f054, pd_descale_p##PASS); \
  out2h = vec_msums(tmp1312h, pw_f130_f054, pd_descale_p##PASS); \
  out6l = vec_msums(tmp1312l, pw_f054_mf130, pd_descale_p##PASS); \
  out6h = vec_msums(tmp1312h, pw_f054_mf130, pd_descale_p##PASS); \
  \
  out2l = vec_sra(out2l, descale_p##PASS); \
  out2h = vec_sra(out2h, descale_p##PASS); \
  out6l = vec_sra(out6l, descale_p##PASS); \
  out6h = vec_sra(out6h, descale_p##PASS); \
  \
  out2 = vec_pack(out2l, out2h); \
  out6 = vec_pack(out6l, out6h); \
  \
  /* Odd part */ \
  \
  z3 = vec_add(tmp4, tmp6); \
  z4 = vec_add(tmp5, tmp7); \
  \
  /* (Original) \
   * z5 = (z3 + z4) * 1.175875602; \
   * z3 = z3 * -1.961570560;  z4 = z4 * -0.390180644; \
   * z3 += z5;  z4 += z5; \
   * \
   * (This implementation) \
   * z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602; \
   * z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644); \
   */ \
  \
  z34l = vec_mergeh(z3, z4); \
  z34h = vec_mergel(z3, z4); \
  \
  z3l = vec_msums(z34l, pw_mf078_f117, pd_descale_p##PASS); \
  z3h = vec_msums(z34h, pw_mf078_f117, pd_descale_p##PASS); \
  z4l = vec_msums(z34l, pw_f117_f078, pd_descale_p##PASS); \
  z4h = vec_msums(z34h, pw_f117_f078, pd_descale_p##PASS); \
  \
  /* (Original) \
   * z1 = tmp4 + tmp7;  z2 = tmp5 + tmp6; \
   * tmp4 = tmp4 * 0.298631336;  tmp5 = tmp5 * 2.053119869; \
   * tmp6 = tmp6 * 3.072711026;  tmp7 = tmp7 * 1.501321110; \
   * z1 = z1 * -0.899976223;  z2 = z2 * -2.562915447; \
   * data7 = tmp4 + z1 + z3;  data5 = tmp5 + z2 + z4; \
   * data3 = tmp6 + z2 + z3;  data1 = tmp7 + z1 + z4; \
   * \
   * (This implementation) \
   * tmp4 = tmp4 * (0.298631336 - 0.899976223) + tmp7 * -0.899976223; \
   * tmp5 = tmp5 * (2.053119869 - 2.562915447) + tmp6 * -2.562915447; \
   * tmp6 = tmp5 * -2.562915447 + tmp6 * (3.072711026 - 2.562915447); \
   * tmp7 = tmp4 * -0.899976223 + tmp7 * (1.501321110 - 0.899976223); \
   * data7 = tmp4 + z3;  data5 = tmp5 + z4; \
   * data3 = tmp6 + z3;  data1 = tmp7 + z4; \
   */ \
  \
  tmp47l = vec_mergeh(tmp4, tmp7); \
  tmp47h = vec_mergel(tmp4, tmp7); \
  \
  out7l = vec_msums(tmp47l, pw_mf060_mf089, z3l); \
  out7h = vec_msums(tmp47h, pw_mf060_mf089, z3h); \
  out1l = vec_msums(tmp47l, pw_mf089_f060, z4l); \
  out1h = vec_msums(tmp47h, pw_mf089_f060, z4h); \
  \
  out7l = vec_sra(out7l, descale_p##PASS); \
  out7h = vec_sra(out7h, descale_p##PASS); \
  out1l = vec_sra(out1l, descale_p##PASS); \
  out1h = vec_sra(out1h, descale_p##PASS); \
  \
  out7 = vec_pack(out7l, out7h); \
  out1 = vec_pack(out1l, out1h); \
  \
  tmp56l = vec_mergeh(tmp5, tmp6); \
  tmp56h = vec_mergel(tmp5, tmp6); \
  \
  out5l = vec_msums(tmp56l, pw_mf050_mf256, z4l); \
  out5h = vec_msums(tmp56h, pw_mf050_mf256, z4h); \
  out3l = vec_msums(tmp56l, pw_mf256_f050, z3l); \
  out3h = vec_msums(tmp56h, pw_mf256_f050, z3h); \
  \
  out5l = vec_sra(out5l, descale_p##PASS); \
  out5h = vec_sra(out5h, descale_p##PASS); \
  out3l = vec_sra(out3l, descale_p##PASS); \
  out3h = vec_sra(out3h, descale_p##PASS); \
  \
  out5 = vec_pack(out5l, out5h); \
  out3 = vec_pack(out3l, out3h); \
}

#define DO_FDCT_PASS1() { \
  /* Even part */ \
  \
  tmp10 = vec_add(tmp0, tmp3); \
  tmp13 = vec_sub(tmp0, tmp3); \
  tmp11 = vec_add(tmp1, tmp2); \
  tmp12 = vec_sub(tmp1, tmp2); \
  \
  out0  = vec_add(tmp10, tmp11); \
  out0  = vec_sl(out0, pass1_bits); \
  out4  = vec_sub(tmp10, tmp11); \
  out4  = vec_sl(out4, pass1_bits); \
  \
  DO_FDCT_COMMON(1); \
}

#define DO_FDCT_PASS2() { \
  /* Even part */ \
  \
  tmp10 = vec_add(tmp0, tmp3); \
  tmp13 = vec_sub(tmp0, tmp3); \
  tmp11 = vec_add(tmp1, tmp2); \
  tmp12 = vec_sub(tmp1, tmp2); \
  \
  out0  = vec_add(tmp10, tmp11); \
  out0  = vec_add(out0, pw_descale_p2x); \
  out0  = vec_sra(out0, pass1_bits); \
  out4  = vec_sub(tmp10, tmp11); \
  out4  = vec_add(out4, pw_descale_p2x); \
  out4  = vec_sra(out4, pass1_bits); \
  \
  DO_FDCT_COMMON(2); \
}


void jsimd_fdct_islow_altivec(DCTELEM *data)
{
  __vector short row0, row1, row2, row3, row4, row5, row6, row7,
    col0, col1, col2, col3, col4, col5, col6, col7,
    tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp10, tmp11, tmp12, tmp13,
    tmp47l, tmp47h, tmp56l, tmp56h, tmp1312l, tmp1312h,
    z3, z4, z34l, z34h,
    out0, out1, out2, out3, out4, out5, out6, out7;
  __vector int z3l, z3h, z4l, z4h,
    out1l, out1h, out2l, out2h, out3l, out3h, out5l, out5h, out6l, out6h,
    out7l, out7h;

  /* Constants */
  __vector short
    pw_f130_f054 = { __4X2(F_0_541 + F_0_765, F_0_541) },
    pw_f054_mf130 = { __4X2(F_0_541, F_0_541 - F_1_847) },
    pw_mf078_f117 = { __4X2(F_1_175 - F_1_961, F_1_175) },
    pw_f117_f078 = { __4X2(F_1_175, F_1_175 - F_0_390) },
    pw_mf060_mf089 = { __4X2(F_0_298 - F_0_899, -F_0_899) },
    pw_mf089_f060 = { __4X2(-F_0_899, F_1_501 - F_0_899) },
    pw_mf050_mf256 = { __4X2(F_2_053 - F_2_562, -F_2_562) },
    pw_mf256_f050 = { __4X2(-F_2_562, F_3_072 - F_2_562) },
    pw_descale_p2x = { __8X(1 << (PASS1_BITS - 1)) };
  __vector unsigned short pass1_bits = { __8X(PASS1_BITS) };
  __vector int pd_descale_p1 = { __4X(1 << (DESCALE_P1 - 1)) },
    pd_descale_p2 = { __4X(1 << (DESCALE_P2 - 1)) };
  __vector unsigned int descale_p1 = { __4X(DESCALE_P1) },
    descale_p2 = { __4X(DESCALE_P2) };

  /* Pass 1: process rows */

  row0 = vec_ld(0, data);
  row1 = vec_ld(16, data);
  row2 = vec_ld(32, data);
  row3 = vec_ld(48, data);
  row4 = vec_ld(64, data);
  row5 = vec_ld(80, data);
  row6 = vec_ld(96, data);
  row7 = vec_ld(112, data);

  TRANSPOSE(row, col);

  tmp0 = vec_add(col0, col7);
  tmp7 = vec_sub(col0, col7);
  tmp1 = vec_add(col1, col6);
  tmp6 = vec_sub(col1, col6);
  tmp2 = vec_add(col2, col5);
  tmp5 = vec_sub(col2, col5);
  tmp3 = vec_add(col3, col4);
  tmp4 = vec_sub(col3, col4);

  DO_FDCT_PASS1();

  /* Pass 2: process columns */

  TRANSPOSE(out, row);

  tmp0 = vec_add(row0, row7);
  tmp7 = vec_sub(row0, row7);
  tmp1 = vec_add(row1, row6);
  tmp6 = vec_sub(row1, row6);
  tmp2 = vec_add(row2, row5);
  tmp5 = vec_sub(row2, row5);
  tmp3 = vec_add(row3, row4);
  tmp4 = vec_sub(row3, row4);

  DO_FDCT_PASS2();

  vec_st(out0, 0, data);
  vec_st(out1, 16, data);
  vec_st(out2, 32, data);
  vec_st(out3, 48, data);
  vec_st(out4, 64, data);
  vec_st(out5, 80, data);
  vec_st(out6, 96, data);
  vec_st(out7, 112, data);
}