Altivec Patch (Mark III) by (Dieter Shirley <dieters at schemasoft dot com>)
[libav.git] / libavcodec / ppc / idct_altivec.c
1 /*
2 * Copyright (c) 2001 Michel Lespinasse
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 */
19
20 /*
21 * NOTE: This code is based on GPL code from the libmpeg2 project. The
22 * author, Michel Lespinasses, has given explicit permission to release
23 * under LGPL as part of ffmpeg.
24 *
25 */
26
27 /*
28 * FFMpeg integration by Dieter Shirley
29 *
30 * This file is a direct copy of the altivec idct module from the libmpeg2
31 * project. I've deleted all of the libmpeg2 specific code, renamed the functions and
32 * re-ordered the function parameters. The only change to the IDCT function
33 * itself was to factor out the partial transposition, and to perform a full
34 * transpose at the end of the function.
35 */
36
37
38 #include <stdlib.h> /* malloc(), free() */
39 #include <string.h>
40 #include "../dsputil.h"
41
42 #define vector_s16_t vector signed short
43 #define vector_u16_t vector unsigned short
44 #define vector_s8_t vector signed char
45 #define vector_u8_t vector unsigned char
46 #define vector_s32_t vector signed int
47 #define vector_u32_t vector unsigned int
48
49 #define IDCT_HALF \
50 /* 1st stage */ \
51 t1 = vec_mradds (a1, vx7, vx1 ); \
52 t8 = vec_mradds (a1, vx1, vec_subs (zero, vx7)); \
53 t7 = vec_mradds (a2, vx5, vx3); \
54 t3 = vec_mradds (ma2, vx3, vx5); \
55 \
56 /* 2nd stage */ \
57 t5 = vec_adds (vx0, vx4); \
58 t0 = vec_subs (vx0, vx4); \
59 t2 = vec_mradds (a0, vx6, vx2); \
60 t4 = vec_mradds (a0, vx2, vec_subs (zero, vx6)); \
61 t6 = vec_adds (t8, t3); \
62 t3 = vec_subs (t8, t3); \
63 t8 = vec_subs (t1, t7); \
64 t1 = vec_adds (t1, t7); \
65 \
66 /* 3rd stage */ \
67 t7 = vec_adds (t5, t2); \
68 t2 = vec_subs (t5, t2); \
69 t5 = vec_adds (t0, t4); \
70 t0 = vec_subs (t0, t4); \
71 t4 = vec_subs (t8, t3); \
72 t3 = vec_adds (t8, t3); \
73 \
74 /* 4th stage */ \
75 vy0 = vec_adds (t7, t1); \
76 vy7 = vec_subs (t7, t1); \
77 vy1 = vec_mradds (c4, t3, t5); \
78 vy6 = vec_mradds (mc4, t3, t5); \
79 vy2 = vec_mradds (c4, t4, t0); \
80 vy5 = vec_mradds (mc4, t4, t0); \
81 vy3 = vec_adds (t2, t6); \
82 vy4 = vec_subs (t2, t6);
83
84
85 #define IDCT \
86 vector_s16_t vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7; \
87 vector_s16_t vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7; \
88 vector_s16_t a0, a1, a2, ma2, c4, mc4, zero, bias; \
89 vector_s16_t t0, t1, t2, t3, t4, t5, t6, t7, t8; \
90 vector_u16_t shift; \
91 \
92 c4 = vec_splat (constants[0], 0); \
93 a0 = vec_splat (constants[0], 1); \
94 a1 = vec_splat (constants[0], 2); \
95 a2 = vec_splat (constants[0], 3); \
96 mc4 = vec_splat (constants[0], 4); \
97 ma2 = vec_splat (constants[0], 5); \
98 bias = (vector_s16_t)vec_splat ((vector_s32_t)constants[0], 3); \
99 \
100 zero = vec_splat_s16 (0); \
101 shift = vec_splat_u16 (4); \
102 \
103 vx0 = vec_mradds (vec_sl (block[0], shift), constants[1], zero); \
104 vx1 = vec_mradds (vec_sl (block[1], shift), constants[2], zero); \
105 vx2 = vec_mradds (vec_sl (block[2], shift), constants[3], zero); \
106 vx3 = vec_mradds (vec_sl (block[3], shift), constants[4], zero); \
107 vx4 = vec_mradds (vec_sl (block[4], shift), constants[1], zero); \
108 vx5 = vec_mradds (vec_sl (block[5], shift), constants[4], zero); \
109 vx6 = vec_mradds (vec_sl (block[6], shift), constants[3], zero); \
110 vx7 = vec_mradds (vec_sl (block[7], shift), constants[2], zero); \
111 \
112 IDCT_HALF \
113 \
114 vx0 = vec_mergeh (vy0, vy4); \
115 vx1 = vec_mergel (vy0, vy4); \
116 vx2 = vec_mergeh (vy1, vy5); \
117 vx3 = vec_mergel (vy1, vy5); \
118 vx4 = vec_mergeh (vy2, vy6); \
119 vx5 = vec_mergel (vy2, vy6); \
120 vx6 = vec_mergeh (vy3, vy7); \
121 vx7 = vec_mergel (vy3, vy7); \
122 \
123 vy0 = vec_mergeh (vx0, vx4); \
124 vy1 = vec_mergel (vx0, vx4); \
125 vy2 = vec_mergeh (vx1, vx5); \
126 vy3 = vec_mergel (vx1, vx5); \
127 vy4 = vec_mergeh (vx2, vx6); \
128 vy5 = vec_mergel (vx2, vx6); \
129 vy6 = vec_mergeh (vx3, vx7); \
130 vy7 = vec_mergel (vx3, vx7); \
131 \
132 vx0 = vec_adds (vec_mergeh (vy0, vy4), bias); \
133 vx1 = vec_mergel (vy0, vy4); \
134 vx2 = vec_mergeh (vy1, vy5); \
135 vx3 = vec_mergel (vy1, vy5); \
136 vx4 = vec_mergeh (vy2, vy6); \
137 vx5 = vec_mergel (vy2, vy6); \
138 vx6 = vec_mergeh (vy3, vy7); \
139 vx7 = vec_mergel (vy3, vy7); \
140 \
141 IDCT_HALF \
142 \
143 shift = vec_splat_u16 (6); \
144 vx0 = vec_sra (vy0, shift); \
145 vx1 = vec_sra (vy1, shift); \
146 vx2 = vec_sra (vy2, shift); \
147 vx3 = vec_sra (vy3, shift); \
148 vx4 = vec_sra (vy4, shift); \
149 vx5 = vec_sra (vy5, shift); \
150 vx6 = vec_sra (vy6, shift); \
151 vx7 = vec_sra (vy7, shift);
152
153 static const vector_s16_t constants[5] = {
154 (vector_s16_t)(23170, 13573, 6518, 21895, -23170, -21895, 32, 31),
155 (vector_s16_t)(16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725),
156 (vector_s16_t)(22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521),
157 (vector_s16_t)(21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692),
158 (vector_s16_t)(19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722)
159 };
160
161 void idct_put_altivec(uint8_t* dest, int stride, vector_s16_t* block)
162 {
163 vector_u8_t tmp;
164
165 IDCT
166
167 #define COPY(dest,src) \
168 tmp = vec_packsu (src, src); \
169 vec_ste ((vector_u32_t)tmp, 0, (unsigned int *)dest); \
170 vec_ste ((vector_u32_t)tmp, 4, (unsigned int *)dest);
171
172 COPY (dest, vx0) dest += stride;
173 COPY (dest, vx1) dest += stride;
174 COPY (dest, vx2) dest += stride;
175 COPY (dest, vx3) dest += stride;
176 COPY (dest, vx4) dest += stride;
177 COPY (dest, vx5) dest += stride;
178 COPY (dest, vx6) dest += stride;
179 COPY (dest, vx7)
180 }
181
182 void idct_add_altivec(uint8_t* dest, int stride, vector_s16_t* block)
183 {
184 vector_u8_t tmp;
185 vector_s16_t tmp2, tmp3;
186 vector_u8_t perm0;
187 vector_u8_t perm1;
188 vector_u8_t p0, p1, p;
189
190 IDCT
191
192 p0 = vec_lvsl (0, dest);
193 p1 = vec_lvsl (stride, dest);
194 p = vec_splat_u8 (-1);
195 perm0 = vec_mergeh (p, p0);
196 perm1 = vec_mergeh (p, p1);
197
198 #define ADD(dest,src,perm) \
199 /* *(uint64_t *)&tmp = *(uint64_t *)dest; */ \
200 tmp = vec_ld (0, dest); \
201 tmp2 = (vector_s16_t)vec_perm (tmp, (vector_u8_t)zero, perm); \
202 tmp3 = vec_adds (tmp2, src); \
203 tmp = vec_packsu (tmp3, tmp3); \
204 vec_ste ((vector_u32_t)tmp, 0, (unsigned int *)dest); \
205 vec_ste ((vector_u32_t)tmp, 4, (unsigned int *)dest);
206
207 ADD (dest, vx0, perm0) dest += stride;
208 ADD (dest, vx1, perm1) dest += stride;
209 ADD (dest, vx2, perm0) dest += stride;
210 ADD (dest, vx3, perm1) dest += stride;
211 ADD (dest, vx4, perm0) dest += stride;
212 ADD (dest, vx5, perm1) dest += stride;
213 ADD (dest, vx6, perm0) dest += stride;
214 ADD (dest, vx7, perm1)
215 }
216