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 _GCC_FIXES_
  24 #define _GCC_FIXES_
  25
  26 #ifdef HAVE_ALTIVEC_H
  27 #include <altivec.h>
  28 #endif
  29
  30 #ifdef CONFIG_DARWIN
  31 # ifndef __MWERKS__
  32 #  define AVV(x...) (x)
  33 # else
  34 #  define AVV
  35 # endif
  36 #define REG_v(a) asm ( #a )
  37 #else
  38
  39 #define AVV(x...) {x}
  40
  41 #if (__GNUC__ < 4)
  42 # define REG_v(a)
  43 #else
  44 # define REG_v(a) asm ( #a )
  45 #endif
  46
  47 #if (__GNUC__ * 100 + __GNUC_MINOR__ < 303)
  48
  49 /* This code was provided to me by Bartosch Pixa
  50  * as a separate header file (broken_mergel.h).
  51  * thanks to lu_zero for the workaround.
  52  *
  53  * See this mail for more information:
  54  * http://gcc.gnu.org/ml/gcc/2003-04/msg00967.html
  55  */
  56
  57 static inline vector signed char ff_vmrglb (vector signed char const A,
  58                                           vector signed char const B)
  59 {
  60     static const vector unsigned char lowbyte = {
  61         0x08, 0x18, 0x09, 0x19, 0x0a, 0x1a, 0x0b,  0x1b,
  62         0x0c, 0x1c, 0x0d, 0x1d, 0x0e, 0x1e, 0x0f, 0x1f
  63     };
  64     return vec_perm (A, B, lowbyte);
  65 }
  66
  67 static inline vector signed short ff_vmrglh (vector signed short const A,
  68                                           vector signed short const B)
  69 {
  70     static const vector unsigned char lowhalf = {
  71         0x08, 0x09, 0x18, 0x19, 0x0a, 0x0b, 0x1a, 0x1b,
  72         0x0c, 0x0d, 0x1c, 0x1d, 0x0e, 0x0f, 0x1e, 0x1f
  73     };
  74     return vec_perm (A, B, lowhalf);
  75 }
  76
  77 static inline vector signed int ff_vmrglw (vector signed int const A,
  78                                           vector signed int const B)
  79 {
  80     static const vector unsigned char lowword = {
  81         0x08, 0x09, 0x0a, 0x0b, 0x18, 0x19, 0x1a, 0x1b,
  82         0x0c, 0x0d, 0x0e, 0x0f, 0x1c, 0x1d, 0x1e, 0x1f
  83     };
  84     return vec_perm (A, B, lowword);
  85 }
  86 /*#define ff_vmrglb ff_vmrglb
  87 #define ff_vmrglh ff_vmrglh
  88 #define ff_vmrglw ff_vmrglw
  89 */
  90 #undef vec_mergel
  91
  92 #define vec_mergel(a1, a2) \
  93 __ch (__bin_args_eq (vector signed char, (a1), vector signed char, (a2)), \
  94       ((vector signed char) ff_vmrglb ((vector signed char) (a1), (vector signed char) (a2))), \
  95 __ch (__bin_args_eq (vector unsigned char, (a1), vector unsigned char, (a2)), \
  96       ((vector unsigned char) ff_vmrglb ((vector signed char) (a1), (vector signed char) (a2))), \
  97 __ch (__bin_args_eq (vector signed short, (a1), vector signed short, (a2)), \
  98       ((vector signed short) ff_vmrglh ((vector signed short) (a1), (vector signed short) (a2))), \
  99 __ch (__bin_args_eq (vector unsigned short, (a1), vector unsigned short, (a2)), \
 100       ((vector unsigned short) ff_vmrglh ((vector signed short) (a1), (vector signed short) (a2))), \
 101 __ch (__bin_args_eq (vector float, (a1), vector float, (a2)), \
 102       ((vector float) ff_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
 103 __ch (__bin_args_eq (vector signed int, (a1), vector signed int, (a2)), \
 104       ((vector signed int) ff_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
 105 __ch (__bin_args_eq (vector unsigned int, (a1), vector unsigned int, (a2)), \
 106       ((vector unsigned int) ff_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
 107     __altivec_link_error_invalid_argument ())))))))
 108
 109 #endif
 110
 111 #endif /* CONFIG_DARWIN */
 112
 113 #ifndef __MWERKS__
 114 #define const_vector const vector
 115 #else
 116 #define const_vector vector
 117 #endif
 118
 119 #endif /* _GCC_FIXES_ */