PPC fixes & clean-up patch by (Romain Dolbeau <dolbeau at irisa dot fr>)
[libav.git] / 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 #else
17 #define AVV(x...) {x}
18 #if (__GNUC__ * 100 + __GNUC_MINOR__ < 303)
19
20 /* This code was provided to me by Bartosch Pixa
21 * as a separate header file (broken_mergel.h).
22 * thanks to lu_zero for the workaround.
23 *
24 * See this mail for more information:
25 * http://gcc.gnu.org/ml/gcc/2003-04/msg00967.html
26 */
27
28 static inline vector signed char my_vmrglb (vector signed char const A,
29 vector signed char const B)
30 {
31 static const vector unsigned char lowbyte = {
32 0x08, 0x18, 0x09, 0x19, 0x0a, 0x1a, 0x0b, 0x1b,
33 0x0c, 0x1c, 0x0d, 0x1d, 0x0e, 0x1e, 0x0f, 0x1f
34 };
35 return vec_perm (A, B, lowbyte);
36 }
37
38 static inline vector signed short my_vmrglh (vector signed short const A,
39 vector signed short const B)
40 {
41 static const vector unsigned char lowhalf = {
42 0x08, 0x09, 0x18, 0x19, 0x0a, 0x0b, 0x1a, 0x1b,
43 0x0c, 0x0d, 0x1c, 0x1d, 0x0e, 0x0f, 0x1e, 0x1f
44 };
45 return vec_perm (A, B, lowhalf);
46 }
47
48 static inline vector signed int my_vmrglw (vector signed int const A,
49 vector signed int const B)
50 {
51 static const vector unsigned char lowword = {
52 0x08, 0x09, 0x0a, 0x0b, 0x18, 0x19, 0x1a, 0x1b,
53 0x0c, 0x0d, 0x0e, 0x0f, 0x1c, 0x1d, 0x1e, 0x1f
54 };
55 return vec_perm (A, B, lowword);
56 }
57 /*#define my_vmrglb my_vmrglb
58 #define my_vmrglh my_vmrglh
59 #define my_vmrglw my_vmrglw
60 */
61 #undef vec_mergel
62
63 #define vec_mergel(a1, a2) \
64 __ch (__bin_args_eq (vector signed char, (a1), vector signed char, (a2)), \
65 ((vector signed char) my_vmrglb ((vector signed char) (a1), (vector signed char) (a2))), \
66 __ch (__bin_args_eq (vector unsigned char, (a1), vector unsigned char, (a2)), \
67 ((vector unsigned char) my_vmrglb ((vector signed char) (a1), (vector signed char) (a2))), \
68 __ch (__bin_args_eq (vector signed short, (a1), vector signed short, (a2)), \
69 ((vector signed short) my_vmrglh ((vector signed short) (a1), (vector signed short) (a2))), \
70 __ch (__bin_args_eq (vector unsigned short, (a1), vector unsigned short, (a2)), \
71 ((vector unsigned short) my_vmrglh ((vector signed short) (a1), (vector signed short) (a2))), \
72 __ch (__bin_args_eq (vector float, (a1), vector float, (a2)), \
73 ((vector float) my_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
74 __ch (__bin_args_eq (vector signed int, (a1), vector signed int, (a2)), \
75 ((vector signed int) my_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
76 __ch (__bin_args_eq (vector unsigned int, (a1), vector unsigned int, (a2)), \
77 ((vector unsigned int) my_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
78 __altivec_link_error_invalid_argument ())))))))
79
80 #endif
81
82 #endif /* CONFIG_DARWIN */
83
84 #endif /* _GCC_FIXES_ */