libavcodec/ppc/gcc_fixes.h

   1 /*
   2  * gcc fixes for altivec.
   3  * Used to workaround broken gcc (FSF gcc-3 pre gcc-3.3)
   4  * and to stay somewhat compatible with Darwin.
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #ifndef FFMPEG_GCC_FIXES_H
  24 #define FFMPEG_GCC_FIXES_H
  25
  26 #include "config.h"
  27
  28 #ifdef HAVE_ALTIVEC_H
  29 #include <altivec.h>
  30 #endif
  31
  32 #if (__GNUC__ < 4)
  33 # define REG_v(a)
  34 #else
  35 # define REG_v(a) asm ( #a )
  36 #endif
  37
  38 #if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
  39
  40 /* This code was provided to me by Bartosch Pixa
  41  * as a separate header file (broken_mergel.h).
  42  * thanks to lu_zero for the workaround.
  43  *
  44  * See this mail for more information:
  45  * http://gcc.gnu.org/ml/gcc/2003-04/msg00967.html
  46  */
  47
  48 static inline vector signed char ff_vmrglb (vector signed char const A,
  49                                           vector signed char const B)
  50 {
  51     static const vector unsigned char lowbyte = {
  52         0x08, 0x18, 0x09, 0x19, 0x0a, 0x1a, 0x0b,  0x1b,
  53         0x0c, 0x1c, 0x0d, 0x1d, 0x0e, 0x1e, 0x0f, 0x1f
  54     };
  55     return vec_perm (A, B, lowbyte);
  56 }
  57
  58 static inline vector signed short ff_vmrglh (vector signed short const A,
  59                                           vector signed short const B)
  60 {
  61     static const vector unsigned char lowhalf = {
  62         0x08, 0x09, 0x18, 0x19, 0x0a, 0x0b, 0x1a, 0x1b,
  63         0x0c, 0x0d, 0x1c, 0x1d, 0x0e, 0x0f, 0x1e, 0x1f
  64     };
  65     return vec_perm (A, B, lowhalf);
  66 }
  67
  68 static inline vector signed int ff_vmrglw (vector signed int const A,
  69                                           vector signed int const B)
  70 {
  71     static const vector unsigned char lowword = {
  72         0x08, 0x09, 0x0a, 0x0b, 0x18, 0x19, 0x1a, 0x1b,
  73         0x0c, 0x0d, 0x0e, 0x0f, 0x1c, 0x1d, 0x1e, 0x1f
  74     };
  75     return vec_perm (A, B, lowword);
  76 }
  77 /*#define ff_vmrglb ff_vmrglb
  78 #define ff_vmrglh ff_vmrglh
  79 #define ff_vmrglw ff_vmrglw
  80 */
  81 #undef vec_mergel
  82
  83 #define vec_mergel(a1, a2) \
  84 __ch (__bin_args_eq (vector signed char, (a1), vector signed char, (a2)), \
  85       ((vector signed char) ff_vmrglb ((vector signed char) (a1), (vector signed char) (a2))), \
  86 __ch (__bin_args_eq (vector unsigned char, (a1), vector unsigned char, (a2)), \
  87       ((vector unsigned char) ff_vmrglb ((vector signed char) (a1), (vector signed char) (a2))), \
  88 __ch (__bin_args_eq (vector signed short, (a1), vector signed short, (a2)), \
  89       ((vector signed short) ff_vmrglh ((vector signed short) (a1), (vector signed short) (a2))), \
  90 __ch (__bin_args_eq (vector unsigned short, (a1), vector unsigned short, (a2)), \
  91       ((vector unsigned short) ff_vmrglh ((vector signed short) (a1), (vector signed short) (a2))), \
  92 __ch (__bin_args_eq (vector float, (a1), vector float, (a2)), \
  93       ((vector float) ff_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
  94 __ch (__bin_args_eq (vector signed int, (a1), vector signed int, (a2)), \
  95       ((vector signed int) ff_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
  96 __ch (__bin_args_eq (vector unsigned int, (a1), vector unsigned int, (a2)), \
  97       ((vector unsigned int) ff_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
  98     __altivec_link_error_invalid_argument ())))))))
  99
 100 #endif /* (__GNUC__ == 3 && __GNUC_MINOR__ < 3) */
 101
 102 #endif /* FFMPEG_GCC_FIXES_H */