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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. #if HAVE_ALTIVEC_H
  32. #include <altivec.h>
  33. #endif
  34.  
  35. #include "types_altivec.h"
  36.  
  37. #if HAVE_ALTIVEC
  38.  
  39. // used to build registers permutation vectors (vcprm)
  40. // the 's' are for words in the _s_econd vector
  41. #define WORD_0 0x00,0x01,0x02,0x03
  42. #define WORD_1 0x04,0x05,0x06,0x07
  43. #define WORD_2 0x08,0x09,0x0a,0x0b
  44. #define WORD_3 0x0c,0x0d,0x0e,0x0f
  45. #define WORD_s0 0x10,0x11,0x12,0x13
  46. #define WORD_s1 0x14,0x15,0x16,0x17
  47. #define WORD_s2 0x18,0x19,0x1a,0x1b
  48. #define WORD_s3 0x1c,0x1d,0x1e,0x1f
  49.  
  50. #define vcprm(a,b,c,d) (const vector unsigned char){WORD_ ## a, WORD_ ## b, WORD_ ## c, WORD_ ## d}
  51. #define vcii(a,b,c,d) (const vector float){FLOAT_ ## a, FLOAT_ ## b, FLOAT_ ## c, FLOAT_ ## d}
  52.  
  53. // vcprmle is used to keep the same index as in the SSE version.
  54. // it's the same as vcprm, with the index inversed
  55. // ('le' is Little Endian)
  56. #define vcprmle(a,b,c,d) vcprm(d,c,b,a)
  57.  
  58. // used to build inverse/identity vectors (vcii)
  59. // n is _n_egative, p is _p_ositive
  60. #define FLOAT_n -1.
  61. #define FLOAT_p 1.
  62.  
  63.  
  64. // Transpose 8x8 matrix of 16-bit elements (in-place)
  65. #define TRANSPOSE8(a,b,c,d,e,f,g,h) \
  66. do { \
  67.     vector signed short A1, B1, C1, D1, E1, F1, G1, H1; \
  68.     vector signed short A2, B2, C2, D2, E2, F2, G2, H2; \
  69.  \
  70.     A1 = vec_mergeh (a, e); \
  71.     B1 = vec_mergel (a, e); \
  72.     C1 = vec_mergeh (b, f); \
  73.     D1 = vec_mergel (b, f); \
  74.     E1 = vec_mergeh (c, g); \
  75.     F1 = vec_mergel (c, g); \
  76.     G1 = vec_mergeh (d, h); \
  77.     H1 = vec_mergel (d, h); \
  78.  \
  79.     A2 = vec_mergeh (A1, E1); \
  80.     B2 = vec_mergel (A1, E1); \
  81.     C2 = vec_mergeh (B1, F1); \
  82.     D2 = vec_mergel (B1, F1); \
  83.     E2 = vec_mergeh (C1, G1); \
  84.     F2 = vec_mergel (C1, G1); \
  85.     G2 = vec_mergeh (D1, H1); \
  86.     H2 = vec_mergel (D1, H1); \
  87.  \
  88.     a = vec_mergeh (A2, E2); \
  89.     b = vec_mergel (A2, E2); \
  90.     c = vec_mergeh (B2, F2); \
  91.     d = vec_mergel (B2, F2); \
  92.     e = vec_mergeh (C2, G2); \
  93.     f = vec_mergel (C2, G2); \
  94.     g = vec_mergeh (D2, H2); \
  95.     h = vec_mergel (D2, H2); \
  96. } while (0)
  97.  
  98.  
  99. /** @brief loads unaligned vector @a *src with offset @a offset
  100.     and returns it */
  101. static inline vector unsigned char unaligned_load(int offset, uint8_t *src)
  102. {
  103.     register vector unsigned char first = vec_ld(offset, src);
  104.     register vector unsigned char second = vec_ld(offset+15, src);
  105.     register vector unsigned char mask = vec_lvsl(offset, src);
  106.     return vec_perm(first, second, mask);
  107. }
  108.  
  109. /**
  110.  * loads vector known misalignment
  111.  * @param perm_vec the align permute vector to combine the two loads from lvsl
  112.  */
  113. static inline vec_u8 load_with_perm_vec(int offset, uint8_t *src, vec_u8 perm_vec)
  114. {
  115.     vec_u8 a = vec_ld(offset, src);
  116.     vec_u8 b = vec_ld(offset+15, src);
  117.     return vec_perm(a, b, perm_vec);
  118. }
  119.  
  120. #endif /* HAVE_ALTIVEC */
  121.  
  122. #endif /* AVUTIL_PPC_UTIL_ALTIVEC_H */
  123.