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1 | /* |
2 | SDL - Simple DirectMedia Layer | |
3 | Copyright (C) 1997-2006 Sam Lantinga | |
4 | ||
5 | This library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | This library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with this library; if not, write to the Free Software | |
17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | ||
19 | Sam Lantinga | |
20 | slouken@libsdl.org | |
21 | */ | |
22 | ||
23 | /* Functions for reading and writing endian-specific values */ | |
24 | ||
25 | #ifndef _SDL_endian_h | |
26 | #define _SDL_endian_h | |
27 | ||
28 | #include "SDL_stdinc.h" | |
29 | ||
30 | /* The two types of endianness */ | |
31 | #define SDL_LIL_ENDIAN 1234 | |
32 | #define SDL_BIG_ENDIAN 4321 | |
33 | ||
34 | #ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */ | |
35 | #if defined(__hppa__) || \ | |
36 | defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \ | |
37 | (defined(__MIPS__) && defined(__MISPEB__)) || \ | |
38 | defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \ | |
39 | defined(__sparc__) | |
40 | #define SDL_BYTEORDER SDL_BIG_ENDIAN | |
41 | #else | |
42 | #define SDL_BYTEORDER SDL_LIL_ENDIAN | |
43 | #endif | |
44 | #endif /* !SDL_BYTEORDER */ | |
45 | ||
46 | ||
47 | #include "begin_code.h" | |
48 | /* Set up for C function definitions, even when using C++ */ | |
49 | #ifdef __cplusplus | |
50 | extern "C" { | |
51 | #endif | |
52 | ||
53 | /* Use inline functions for compilers that support them, and static | |
54 | functions for those that do not. Because these functions become | |
55 | static for compilers that do not support inline functions, this | |
56 | header should only be included in files that actually use them. | |
57 | */ | |
58 | #if defined(__GNUC__) && defined(__i386__) && \ | |
59 | !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */) | |
60 | static __inline__ Uint16 SDL_Swap16(Uint16 x) | |
61 | { | |
62 | __asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x)); | |
63 | return x; | |
64 | } | |
65 | #elif defined(__GNUC__) && defined(__x86_64__) | |
66 | static __inline__ Uint16 SDL_Swap16(Uint16 x) | |
67 | { | |
68 | __asm__("xchgb %b0,%h0" : "=Q" (x) : "0" (x)); | |
69 | return x; | |
70 | } | |
71 | #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) | |
72 | static __inline__ Uint16 SDL_Swap16(Uint16 x) | |
73 | { | |
74 | Uint16 result; | |
75 | ||
76 | __asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x)); | |
77 | return result; | |
78 | } | |
79 | #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) | |
80 | static __inline__ Uint16 SDL_Swap16(Uint16 x) | |
81 | { | |
82 | __asm__("rorw #8,%0" : "=d" (x) : "0" (x) : "cc"); | |
83 | return x; | |
84 | } | |
85 | #else | |
86 | static __inline__ Uint16 SDL_Swap16(Uint16 x) { | |
87 | return((x<<8)|(x>>8)); | |
88 | } | |
89 | #endif | |
90 | ||
91 | #if defined(__GNUC__) && defined(__i386__) && \ | |
92 | !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */) | |
93 | static __inline__ Uint32 SDL_Swap32(Uint32 x) | |
94 | { | |
95 | __asm__("bswap %0" : "=r" (x) : "0" (x)); | |
96 | return x; | |
97 | } | |
98 | #elif defined(__GNUC__) && defined(__x86_64__) | |
99 | static __inline__ Uint32 SDL_Swap32(Uint32 x) | |
100 | { | |
101 | __asm__("bswapl %0" : "=r" (x) : "0" (x)); | |
102 | return x; | |
103 | } | |
104 | #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) | |
105 | static __inline__ Uint32 SDL_Swap32(Uint32 x) | |
106 | { | |
107 | Uint32 result; | |
108 | ||
109 | __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x)); | |
110 | __asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x)); | |
111 | __asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x)); | |
112 | return result; | |
113 | } | |
114 | #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) | |
115 | static __inline__ Uint32 SDL_Swap32(Uint32 x) | |
116 | { | |
117 | __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0" : "=d" (x) : "0" (x) : "cc"); | |
118 | return x; | |
119 | } | |
120 | #else | |
121 | static __inline__ Uint32 SDL_Swap32(Uint32 x) { | |
122 | return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24)); | |
123 | } | |
124 | #endif | |
125 | ||
126 | #ifdef SDL_HAS_64BIT_TYPE | |
127 | #if defined(__GNUC__) && defined(__i386__) && \ | |
128 | !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */) | |
129 | static __inline__ Uint64 SDL_Swap64(Uint64 x) | |
130 | { | |
131 | union { | |
132 | struct { Uint32 a,b; } s; | |
133 | Uint64 u; | |
134 | } v; | |
135 | v.u = x; | |
136 | __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1" | |
137 | : "=r" (v.s.a), "=r" (v.s.b) | |
138 | : "0" (v.s.a), "1" (v.s.b)); | |
139 | return v.u; | |
140 | } | |
141 | #elif defined(__GNUC__) && defined(__x86_64__) | |
142 | static __inline__ Uint64 SDL_Swap64(Uint64 x) | |
143 | { | |
144 | __asm__("bswapq %0" : "=r" (x) : "0" (x)); | |
145 | return x; | |
146 | } | |
147 | #else | |
148 | static __inline__ Uint64 SDL_Swap64(Uint64 x) | |
149 | { | |
150 | Uint32 hi, lo; | |
151 | ||
152 | /* Separate into high and low 32-bit values and swap them */ | |
153 | lo = (Uint32)(x&0xFFFFFFFF); | |
154 | x >>= 32; | |
155 | hi = (Uint32)(x&0xFFFFFFFF); | |
156 | x = SDL_Swap32(lo); | |
157 | x <<= 32; | |
158 | x |= SDL_Swap32(hi); | |
159 | return(x); | |
160 | } | |
161 | #endif | |
162 | #else | |
163 | /* This is mainly to keep compilers from complaining in SDL code. | |
164 | If there is no real 64-bit datatype, then compilers will complain about | |
165 | the fake 64-bit datatype that SDL provides when it compiles user code. | |
166 | */ | |
167 | #define SDL_Swap64(X) (X) | |
168 | #endif /* SDL_HAS_64BIT_TYPE */ | |
169 | ||
170 | ||
171 | /* Byteswap item from the specified endianness to the native endianness */ | |
172 | #if SDL_BYTEORDER == SDL_LIL_ENDIAN | |
173 | #define SDL_SwapLE16(X) (X) | |
174 | #define SDL_SwapLE32(X) (X) | |
175 | #define SDL_SwapLE64(X) (X) | |
176 | #define SDL_SwapBE16(X) SDL_Swap16(X) | |
177 | #define SDL_SwapBE32(X) SDL_Swap32(X) | |
178 | #define SDL_SwapBE64(X) SDL_Swap64(X) | |
179 | #else | |
180 | #define SDL_SwapLE16(X) SDL_Swap16(X) | |
181 | #define SDL_SwapLE32(X) SDL_Swap32(X) | |
182 | #define SDL_SwapLE64(X) SDL_Swap64(X) | |
183 | #define SDL_SwapBE16(X) (X) | |
184 | #define SDL_SwapBE32(X) (X) | |
185 | #define SDL_SwapBE64(X) (X) | |
186 | #endif | |
187 | ||
188 | /* Ends C function definitions when using C++ */ | |
189 | #ifdef __cplusplus | |
190 | } | |
191 | #endif | |
192 | #include "close_code.h" | |
193 | ||
194 | #endif /* _SDL_endian_h */ |