6e03f11fa0196fad1f94bbdd86e54d8b9cfc5ffe
[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 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef _GCC_FIXES_
22 #define _GCC_FIXES_
23
24 #ifdef HAVE_ALTIVEC_H
25 #include <altivec.h>
26 #endif
27
28 #ifdef CONFIG_DARWIN
29 # ifndef __MWERKS__
30 # define AVV(x...) (x)
31 # else
32 # define AVV
33 # endif
34 #define REG_v(a) asm ( #a )
35 #else
36
37 #define AVV(x...) {x}
38
39 #if (__GNUC__ < 4)
40 # define REG_v(a)
41 #else
42 # define REG_v(a) asm ( #a )
43 #endif
44
45 #if (__GNUC__ * 100 + __GNUC_MINOR__ < 303)
46
47 /* This code was provided to me by Bartosch Pixa
48 * as a separate header file (broken_mergel.h).
49 * thanks to lu_zero for the workaround.
50 *
51 * See this mail for more information:
52 * http://gcc.gnu.org/ml/gcc/2003-04/msg00967.html
53 */
54
55 static inline vector signed char ff_vmrglb (vector signed char const A,
56 vector signed char const B)
57 {
58 static const vector unsigned char lowbyte = {
59 0x08, 0x18, 0x09, 0x19, 0x0a, 0x1a, 0x0b, 0x1b,
60 0x0c, 0x1c, 0x0d, 0x1d, 0x0e, 0x1e, 0x0f, 0x1f
61 };
62 return vec_perm (A, B, lowbyte);
63 }
64
65 static inline vector signed short ff_vmrglh (vector signed short const A,
66 vector signed short const B)
67 {
68 static const vector unsigned char lowhalf = {
69 0x08, 0x09, 0x18, 0x19, 0x0a, 0x0b, 0x1a, 0x1b,
70 0x0c, 0x0d, 0x1c, 0x1d, 0x0e, 0x0f, 0x1e, 0x1f
71 };
72 return vec_perm (A, B, lowhalf);
73 }
74
75 static inline vector signed int ff_vmrglw (vector signed int const A,
76 vector signed int const B)
77 {
78 static const vector unsigned char lowword = {
79 0x08, 0x09, 0x0a, 0x0b, 0x18, 0x19, 0x1a, 0x1b,
80 0x0c, 0x0d, 0x0e, 0x0f, 0x1c, 0x1d, 0x1e, 0x1f
81 };
82 return vec_perm (A, B, lowword);
83 }
84 /*#define ff_vmrglb ff_vmrglb
85 #define ff_vmrglh ff_vmrglh
86 #define ff_vmrglw ff_vmrglw
87 */
88 #undef vec_mergel
89
90 #define vec_mergel(a1, a2) \
91 __ch (__bin_args_eq (vector signed char, (a1), vector signed char, (a2)), \
92 ((vector signed char) ff_vmrglb ((vector signed char) (a1), (vector signed char) (a2))), \
93 __ch (__bin_args_eq (vector unsigned char, (a1), vector unsigned char, (a2)), \
94 ((vector unsigned char) ff_vmrglb ((vector signed char) (a1), (vector signed char) (a2))), \
95 __ch (__bin_args_eq (vector signed short, (a1), vector signed short, (a2)), \
96 ((vector signed short) ff_vmrglh ((vector signed short) (a1), (vector signed short) (a2))), \
97 __ch (__bin_args_eq (vector unsigned short, (a1), vector unsigned short, (a2)), \
98 ((vector unsigned short) ff_vmrglh ((vector signed short) (a1), (vector signed short) (a2))), \
99 __ch (__bin_args_eq (vector float, (a1), vector float, (a2)), \
100 ((vector float) ff_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
101 __ch (__bin_args_eq (vector signed int, (a1), vector signed int, (a2)), \
102 ((vector signed int) ff_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
103 __ch (__bin_args_eq (vector unsigned int, (a1), vector unsigned int, (a2)), \
104 ((vector unsigned int) ff_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
105 __altivec_link_error_invalid_argument ())))))))
106
107 #endif
108
109 #endif /* CONFIG_DARWIN */
110
111 #ifndef __MWERKS__
112 #define const_vector const vector
113 #else
114 #define const_vector vector
115 #endif
116
117 #endif /* _GCC_FIXES_ */