FFmpeg
util_altivec.h
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg 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 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg 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 FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 /**
20  * @file
21  * Contains misc utility macros and inline functions
22  */
23 
24 #ifndef AVUTIL_PPC_UTIL_ALTIVEC_H
25 #define AVUTIL_PPC_UTIL_ALTIVEC_H
26 
27 #include <stdint.h>
28 
29 #include "config.h"
30 
31 /***********************************************************************
32  * Vector types
33  **********************************************************************/
34 #define vec_u8 vector unsigned char
35 #define vec_s8 vector signed char
36 #define vec_u16 vector unsigned short
37 #define vec_s16 vector signed short
38 #define vec_u32 vector unsigned int
39 #define vec_s32 vector signed int
40 #define vec_f vector float
41 
42 /***********************************************************************
43  * Null vector
44  **********************************************************************/
45 #define LOAD_ZERO const vec_u8 zerov = vec_splat_u8( 0 )
46 
47 #define zero_u8v (vec_u8) zerov
48 #define zero_s8v (vec_s8) zerov
49 #define zero_u16v (vec_u16) zerov
50 #define zero_s16v (vec_s16) zerov
51 #define zero_u32v (vec_u32) zerov
52 #define zero_s32v (vec_s32) zerov
53 
54 #if HAVE_ALTIVEC
55 #include <altivec.h>
56 
57 // used to build registers permutation vectors (vcprm)
58 // the 's' are for words in the _s_econd vector
59 #define WORD_0 0x00,0x01,0x02,0x03
60 #define WORD_1 0x04,0x05,0x06,0x07
61 #define WORD_2 0x08,0x09,0x0a,0x0b
62 #define WORD_3 0x0c,0x0d,0x0e,0x0f
63 #define WORD_s0 0x10,0x11,0x12,0x13
64 #define WORD_s1 0x14,0x15,0x16,0x17
65 #define WORD_s2 0x18,0x19,0x1a,0x1b
66 #define WORD_s3 0x1c,0x1d,0x1e,0x1f
67 #define vcprm(a,b,c,d) (const vec_u8){WORD_ ## a, WORD_ ## b, WORD_ ## c, WORD_ ## d}
68 
69 #define SWP_W2S0 0x02,0x03,0x00,0x01
70 #define SWP_W2S1 0x06,0x07,0x04,0x05
71 #define SWP_W2S2 0x0a,0x0b,0x08,0x09
72 #define SWP_W2S3 0x0e,0x0f,0x0c,0x0d
73 #define SWP_W2Ss0 0x12,0x13,0x10,0x11
74 #define SWP_W2Ss1 0x16,0x17,0x14,0x15
75 #define SWP_W2Ss2 0x1a,0x1b,0x18,0x19
76 #define SWP_W2Ss3 0x1e,0x1f,0x1c,0x1d
77 #define vcswapi2s(a,b,c,d) (const vector unsigned char){SWP_W2S ## a, SWP_W2S ## b, SWP_W2S ## c, SWP_W2S ## d}
78 
79 #define vcswapc() \
80  (const vector unsigned char){0x0f,0x0e,0x0d,0x0c,0x0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x01,0x00}
81 
82 
83 // Transpose 8x8 matrix of 16-bit elements (in-place)
84 #define TRANSPOSE8(a,b,c,d,e,f,g,h) \
85 do { \
86  vec_s16 A1, B1, C1, D1, E1, F1, G1, H1; \
87  vec_s16 A2, B2, C2, D2, E2, F2, G2, H2; \
88  \
89  A1 = vec_mergeh (a, e); \
90  B1 = vec_mergel (a, e); \
91  C1 = vec_mergeh (b, f); \
92  D1 = vec_mergel (b, f); \
93  E1 = vec_mergeh (c, g); \
94  F1 = vec_mergel (c, g); \
95  G1 = vec_mergeh (d, h); \
96  H1 = vec_mergel (d, h); \
97  \
98  A2 = vec_mergeh (A1, E1); \
99  B2 = vec_mergel (A1, E1); \
100  C2 = vec_mergeh (B1, F1); \
101  D2 = vec_mergel (B1, F1); \
102  E2 = vec_mergeh (C1, G1); \
103  F2 = vec_mergel (C1, G1); \
104  G2 = vec_mergeh (D1, H1); \
105  H2 = vec_mergel (D1, H1); \
106  \
107  a = vec_mergeh (A2, E2); \
108  b = vec_mergel (A2, E2); \
109  c = vec_mergeh (B2, F2); \
110  d = vec_mergel (B2, F2); \
111  e = vec_mergeh (C2, G2); \
112  f = vec_mergel (C2, G2); \
113  g = vec_mergeh (D2, H2); \
114  h = vec_mergel (D2, H2); \
115 } while (0)
116 
117 
118 #if HAVE_BIGENDIAN
119 #define VEC_LD(offset,b) \
120  vec_perm(vec_ld(offset, b), vec_ld((offset)+15, b), vec_lvsl(offset, b))
121 #else
122 #define VEC_LD(offset,b) \
123  vec_vsx_ld(offset, b)
124 #endif
125 
126 /** @brief loads unaligned vector @a *src with offset @a offset
127  and returns it */
128 #if HAVE_BIGENDIAN
129 static inline vec_u8 unaligned_load(int offset, const uint8_t *src)
130 {
131  register vec_u8 first = vec_ld(offset, src);
132  register vec_u8 second = vec_ld(offset + 15, src);
133  register vec_u8 mask = vec_lvsl(offset, src);
134  return vec_perm(first, second, mask);
135 }
136 static inline vec_u8 load_with_perm_vec(int offset, const uint8_t *src, vec_u8 perm_vec)
137 {
138  vec_u8 a = vec_ld(offset, src);
139  vec_u8 b = vec_ld(offset + 15, src);
140  return vec_perm(a, b, perm_vec);
141 }
142 #else
143 #define unaligned_load(a,b) VEC_LD(a,b)
144 #define load_with_perm_vec(a,b,c) VEC_LD(a,b)
145 #endif
146 
147 
148 /**
149  * loads vector known misalignment
150  * @param perm_vec the align permute vector to combine the two loads from lvsl
151  */
152 
153 #define vec_unaligned_load(b) VEC_LD(0, b)
154 
155 #if HAVE_BIGENDIAN
156 #define VEC_MERGEH(a, b) vec_mergeh(a, b)
157 #define VEC_MERGEL(a, b) vec_mergel(a, b)
158 #else
159 #define VEC_MERGEH(a, b) vec_mergeh(b, a)
160 #define VEC_MERGEL(a, b) vec_mergel(b, a)
161 #endif
162 
163 #if HAVE_BIGENDIAN
164 #define VEC_ST(a,b,c) vec_st(a,b,c)
165 #else
166 #define VEC_ST(a,b,c) vec_vsx_st(a,b,c)
167 #endif
168 
169 #if HAVE_BIGENDIAN
170 #define VEC_SPLAT16(a,b) vec_splat((vec_s16)(a), b)
171 #else
172 #define VEC_SPLAT16(a,b) vec_splat((vec_s16)(vec_perm(a, a, vcswapi2s(0,1,2,3))), b)
173 #endif
174 
175 #if HAVE_BIGENDIAN
176 #define VEC_SLD16(a,b,c) vec_sld(a, b, c)
177 #else
178 #define VEC_SLD16(a,b,c) vec_sld(b, a, c)
179 #endif
180 
181 #endif /* HAVE_ALTIVEC */
182 
183 #if HAVE_VSX
184 #if HAVE_BIGENDIAN
185 #define vsx_ld_u8_s16(off, p) \
186  ((vec_s16)vec_mergeh((vec_u8)vec_splat_u8(0), \
187  (vec_u8)vec_vsx_ld((off), (p))))
188 #else
189 #define vsx_ld_u8_s16(off, p) \
190  ((vec_s16)vec_mergeh((vec_u8)vec_vsx_ld((off), (p)), \
191  (vec_u8)vec_splat_u8(0)))
192 #endif /* HAVE_BIGENDIAN */
193 #endif /* HAVE_VSX */
194 
195 #endif /* AVUTIL_PPC_UTIL_ALTIVEC_H */
b
#define b
Definition: input.c:41
first
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But first
Definition: rate_distortion.txt:12
mask
static const uint16_t mask[17]
Definition: lzw.c:38
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
vec_u8
#define vec_u8
Definition: util_altivec.h:34
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
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