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
   7 #ifndef _GCC_FIXES_
   8 #define _GCC_FIXES_
   9
  10 #ifdef HAVE_ALTIVEC_H
  11 #include <altivec.h>
  12 #endif
  13
  14 #ifdef CONFIG_DARWIN
  15 #define AVV(x...) (x)
  16 /* The Apple assembler shipped w/ gcc-3.3 knows about DCBZL, previous assemblers don't
  17    We assume here that the Darwin GCC is from Apple.... */
  18 #if (__GNUC__ * 100 + __GNUC_MINOR__ < 303)
  19 #define NO_DCBZL
  20 #endif
  21 #else
  22 #define AVV(x...) {x}
  23 /* I don't think any non-Apple assembler knows about DCBZL */
  24 #define NO_DCBZL
  25 #if (__GNUC__ * 100 + __GNUC_MINOR__ < 303)
  26
  27 /* This code was provided to me by Bartosch Pixa
  28  * as a separate header file (broken_mergel.h).
  29  * thanks to lu_zero for the workaround.
  30  *
  31  * See this mail for more information:
  32  * http://gcc.gnu.org/ml/gcc/2003-04/msg00967.html
  33  */
  34
  35 static inline vector signed char my_vmrglb (vector signed char const A,
  36                                           vector signed char const B)
  37 {
  38     static const vector unsigned char lowbyte = {
  39         0x08, 0x18, 0x09, 0x19, 0x0a, 0x1a, 0x0b,  0x1b,
  40         0x0c, 0x1c, 0x0d, 0x1d, 0x0e, 0x1e, 0x0f, 0x1f
  41     };
  42     return vec_perm (A, B, lowbyte);
  43 }
  44
  45 static inline vector signed short my_vmrglh (vector signed short const A,
  46                                           vector signed short const B)
  47 {
  48     static const vector unsigned char lowhalf = {
  49         0x08, 0x09, 0x18, 0x19, 0x0a, 0x0b, 0x1a, 0x1b,
  50         0x0c, 0x0d, 0x1c, 0x1d, 0x0e, 0x0f, 0x1e, 0x1f
  51     };
  52     return vec_perm (A, B, lowhalf);
  53 }
  54
  55 static inline vector signed int my_vmrglw (vector signed int const A,
  56                                           vector signed int const B)
  57 {
  58     static const vector unsigned char lowword = {
  59         0x08, 0x09, 0x0a, 0x0b, 0x18, 0x19, 0x1a, 0x1b,
  60         0x0c, 0x0d, 0x0e, 0x0f, 0x1c, 0x1d, 0x1e, 0x1f
  61     };
  62     return vec_perm (A, B, lowword);
  63 }
  64 /*#define my_vmrglb my_vmrglb
  65 #define my_vmrglh my_vmrglh
  66 #define my_vmrglw my_vmrglw
  67 */
  68 #undef vec_mergel
  69
  70 #define vec_mergel(a1, a2) \
  71 __ch (__bin_args_eq (vector signed char, (a1), vector signed char, (a2)), \
  72       ((vector signed char) my_vmrglb ((vector signed char) (a1), (vector signed char) (a2))), \
  73 __ch (__bin_args_eq (vector unsigned char, (a1), vector unsigned char, (a2)), \
  74       ((vector unsigned char) my_vmrglb ((vector signed char) (a1), (vector signed char) (a2))), \
  75 __ch (__bin_args_eq (vector signed short, (a1), vector signed short, (a2)), \
  76       ((vector signed short) my_vmrglh ((vector signed short) (a1), (vector signed short) (a2))), \
  77 __ch (__bin_args_eq (vector unsigned short, (a1), vector unsigned short, (a2)), \
  78       ((vector unsigned short) my_vmrglh ((vector signed short) (a1), (vector signed short) (a2))), \
  79 __ch (__bin_args_eq (vector float, (a1), vector float, (a2)), \
  80       ((vector float) my_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
  81 __ch (__bin_args_eq (vector signed int, (a1), vector signed int, (a2)), \
  82       ((vector signed int) my_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
  83 __ch (__bin_args_eq (vector unsigned int, (a1), vector unsigned int, (a2)), \
  84       ((vector unsigned int) my_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
  85     __altivec_link_error_invalid_argument ())))))))
  86
  87 #endif
  88
  89 #endif /* CONFIG_DARWIN */
  90
  91 #endif /* _GCC_FIXES_ */