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libavcodec/ppc/util_altivec.h

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00001 /*
00002  * This file is part of Libav.
00003  *
00004  * Libav is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU Lesser General Public
00006  * License as published by the Free Software Foundation; either
00007  * version 2.1 of the License, or (at your option) any later version.
00008  *
00009  * Libav is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * Lesser General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU Lesser General Public
00015  * License along with Libav; if not, write to the Free Software
00016  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00017  */
00018 
00024 #ifndef AVCODEC_PPC_UTIL_ALTIVEC_H
00025 #define AVCODEC_PPC_UTIL_ALTIVEC_H
00026 
00027 #include <stdint.h>
00028 
00029 #include "config.h"
00030 
00031 #if HAVE_ALTIVEC_H
00032 #include <altivec.h>
00033 #endif
00034 
00035 #include "types_altivec.h"
00036 
00037 // used to build registers permutation vectors (vcprm)
00038 // the 's' are for words in the _s_econd vector
00039 #define WORD_0 0x00,0x01,0x02,0x03
00040 #define WORD_1 0x04,0x05,0x06,0x07
00041 #define WORD_2 0x08,0x09,0x0a,0x0b
00042 #define WORD_3 0x0c,0x0d,0x0e,0x0f
00043 #define WORD_s0 0x10,0x11,0x12,0x13
00044 #define WORD_s1 0x14,0x15,0x16,0x17
00045 #define WORD_s2 0x18,0x19,0x1a,0x1b
00046 #define WORD_s3 0x1c,0x1d,0x1e,0x1f
00047 
00048 #define vcprm(a,b,c,d) (const vector unsigned char){WORD_ ## a, WORD_ ## b, WORD_ ## c, WORD_ ## d}
00049 #define vcii(a,b,c,d) (const vector float){FLOAT_ ## a, FLOAT_ ## b, FLOAT_ ## c, FLOAT_ ## d}
00050 
00051 // vcprmle is used to keep the same index as in the SSE version.
00052 // it's the same as vcprm, with the index inversed
00053 // ('le' is Little Endian)
00054 #define vcprmle(a,b,c,d) vcprm(d,c,b,a)
00055 
00056 // used to build inverse/identity vectors (vcii)
00057 // n is _n_egative, p is _p_ositive
00058 #define FLOAT_n -1.
00059 #define FLOAT_p 1.
00060 
00061 
00062 // Transpose 8x8 matrix of 16-bit elements (in-place)
00063 #define TRANSPOSE8(a,b,c,d,e,f,g,h) \
00064 do { \
00065     vector signed short A1, B1, C1, D1, E1, F1, G1, H1; \
00066     vector signed short A2, B2, C2, D2, E2, F2, G2, H2; \
00067  \
00068     A1 = vec_mergeh (a, e); \
00069     B1 = vec_mergel (a, e); \
00070     C1 = vec_mergeh (b, f); \
00071     D1 = vec_mergel (b, f); \
00072     E1 = vec_mergeh (c, g); \
00073     F1 = vec_mergel (c, g); \
00074     G1 = vec_mergeh (d, h); \
00075     H1 = vec_mergel (d, h); \
00076  \
00077     A2 = vec_mergeh (A1, E1); \
00078     B2 = vec_mergel (A1, E1); \
00079     C2 = vec_mergeh (B1, F1); \
00080     D2 = vec_mergel (B1, F1); \
00081     E2 = vec_mergeh (C1, G1); \
00082     F2 = vec_mergel (C1, G1); \
00083     G2 = vec_mergeh (D1, H1); \
00084     H2 = vec_mergel (D1, H1); \
00085  \
00086     a = vec_mergeh (A2, E2); \
00087     b = vec_mergel (A2, E2); \
00088     c = vec_mergeh (B2, F2); \
00089     d = vec_mergel (B2, F2); \
00090     e = vec_mergeh (C2, G2); \
00091     f = vec_mergel (C2, G2); \
00092     g = vec_mergeh (D2, H2); \
00093     h = vec_mergel (D2, H2); \
00094 } while (0)
00095 
00096 
00099 static inline vector unsigned char unaligned_load(int offset, uint8_t *src)
00100 {
00101     register vector unsigned char first = vec_ld(offset, src);
00102     register vector unsigned char second = vec_ld(offset+15, src);
00103     register vector unsigned char mask = vec_lvsl(offset, src);
00104     return vec_perm(first, second, mask);
00105 }
00106 
00111 static inline vec_u8 load_with_perm_vec(int offset, uint8_t *src, vec_u8 perm_vec)
00112 {
00113     vec_u8 a = vec_ld(offset, src);
00114     vec_u8 b = vec_ld(offset+15, src);
00115     return vec_perm(a, b, perm_vec);
00116 }
00117 
00118 #endif /* AVCODEC_PPC_UTIL_ALTIVEC_H */
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