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1 | /* |
2 | Simple DirectMedia Layer | |
3 | Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org> | |
4 | ||
5 | This software is provided 'as-is', without any express or implied | |
6 | warranty. In no event will the authors be held liable for any damages | |
7 | arising from the use of this software. | |
8 | ||
9 | Permission is granted to anyone to use this software for any purpose, | |
10 | including commercial applications, and to alter it and redistribute it | |
11 | freely, subject to the following restrictions: | |
12 | ||
13 | 1. The origin of this software must not be misrepresented; you must not | |
14 | claim that you wrote the original software. If you use this software | |
15 | in a product, an acknowledgment in the product documentation would be | |
16 | appreciated but is not required. | |
17 | 2. Altered source versions must be plainly marked as such, and must not be | |
18 | misrepresented as being the original software. | |
19 | 3. This notice may not be removed or altered from any source distribution. | |
20 | */ | |
21 | ||
22 | /** | |
23 | * \file SDL_endian.h | |
24 | * | |
25 | * Functions for reading and writing endian-specific values | |
26 | */ | |
27 | ||
28 | #ifndef _SDL_endian_h | |
29 | #define _SDL_endian_h | |
30 | ||
31 | #include "SDL_stdinc.h" | |
32 | ||
33 | /** | |
34 | * \name The two types of endianness | |
35 | */ | |
36 | /*@{*/ | |
37 | #define SDL_LIL_ENDIAN 1234 | |
38 | #define SDL_BIG_ENDIAN 4321 | |
39 | /*@}*/ | |
40 | ||
41 | #ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */ | |
42 | #ifdef __linux__ | |
43 | #include <endian.h> | |
44 | #define SDL_BYTEORDER __BYTE_ORDER | |
45 | #else /* __linux __ */ | |
46 | #if defined(__hppa__) || \ | |
47 | defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \ | |
48 | (defined(__MIPS__) && defined(__MISPEB__)) || \ | |
49 | defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \ | |
50 | defined(__sparc__) | |
51 | #define SDL_BYTEORDER SDL_BIG_ENDIAN | |
52 | #else | |
53 | #define SDL_BYTEORDER SDL_LIL_ENDIAN | |
54 | #endif | |
55 | #endif /* __linux __ */ | |
56 | #endif /* !SDL_BYTEORDER */ | |
57 | ||
58 | ||
59 | #include "begin_code.h" | |
60 | /* Set up for C function definitions, even when using C++ */ | |
61 | #ifdef __cplusplus | |
62 | extern "C" { | |
63 | #endif | |
64 | ||
65 | /** | |
66 | * \file SDL_endian.h | |
67 | */ | |
68 | #if defined(__GNUC__) && defined(__i386__) && \ | |
69 | !(__GNUC__ == 2 && __GNUC_MINOR__ == 95 /* broken gcc version */) | |
70 | SDL_FORCE_INLINE Uint16 | |
71 | SDL_Swap16(Uint16 x) | |
72 | { | |
73 | __asm__("xchgb %b0,%h0": "=q"(x):"0"(x)); | |
74 | return x; | |
75 | } | |
76 | #elif defined(__GNUC__) && defined(__x86_64__) | |
77 | SDL_FORCE_INLINE Uint16 | |
78 | SDL_Swap16(Uint16 x) | |
79 | { | |
80 | __asm__("xchgb %b0,%h0": "=Q"(x):"0"(x)); | |
81 | return x; | |
82 | } | |
83 | #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) | |
84 | SDL_FORCE_INLINE Uint16 | |
85 | SDL_Swap16(Uint16 x) | |
86 | { | |
87 | int result; | |
88 | ||
89 | __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x)); | |
90 | return (Uint16)result; | |
91 | } | |
92 | #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__) | |
93 | SDL_FORCE_INLINE Uint16 | |
94 | SDL_Swap16(Uint16 x) | |
95 | { | |
96 | __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc"); | |
97 | return x; | |
98 | } | |
99 | #else | |
100 | SDL_FORCE_INLINE Uint16 | |
101 | SDL_Swap16(Uint16 x) | |
102 | { | |
103 | return SDL_static_cast(Uint16, ((x << 8) | (x >> 8))); | |
104 | } | |
105 | #endif | |
106 | ||
107 | #if defined(__GNUC__) && defined(__i386__) | |
108 | SDL_FORCE_INLINE Uint32 | |
109 | SDL_Swap32(Uint32 x) | |
110 | { | |
111 | __asm__("bswap %0": "=r"(x):"0"(x)); | |
112 | return x; | |
113 | } | |
114 | #elif defined(__GNUC__) && defined(__x86_64__) | |
115 | SDL_FORCE_INLINE Uint32 | |
116 | SDL_Swap32(Uint32 x) | |
117 | { | |
118 | __asm__("bswapl %0": "=r"(x):"0"(x)); | |
119 | return x; | |
120 | } | |
121 | #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) | |
122 | SDL_FORCE_INLINE Uint32 | |
123 | SDL_Swap32(Uint32 x) | |
124 | { | |
125 | Uint32 result; | |
126 | ||
127 | __asm__("rlwimi %0,%2,24,16,23": "=&r"(result):"0"(x >> 24), "r"(x)); | |
128 | __asm__("rlwimi %0,%2,8,8,15": "=&r"(result):"0"(result), "r"(x)); | |
129 | __asm__("rlwimi %0,%2,24,0,7": "=&r"(result):"0"(result), "r"(x)); | |
130 | return result; | |
131 | } | |
132 | #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__) | |
133 | SDL_FORCE_INLINE Uint32 | |
134 | SDL_Swap32(Uint32 x) | |
135 | { | |
136 | __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc"); | |
137 | return x; | |
138 | } | |
139 | #else | |
140 | SDL_FORCE_INLINE Uint32 | |
141 | SDL_Swap32(Uint32 x) | |
142 | { | |
143 | return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) | | |
144 | ((x >> 8) & 0x0000FF00) | (x >> 24))); | |
145 | } | |
146 | #endif | |
147 | ||
148 | #if defined(__GNUC__) && defined(__i386__) | |
149 | SDL_FORCE_INLINE Uint64 | |
150 | SDL_Swap64(Uint64 x) | |
151 | { | |
152 | union | |
153 | { | |
154 | struct | |
155 | { | |
156 | Uint32 a, b; | |
157 | } s; | |
158 | Uint64 u; | |
159 | } v; | |
160 | v.u = x; | |
161 | __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1": "=r"(v.s.a), "=r"(v.s.b):"0"(v.s.a), | |
162 | "1"(v.s. | |
163 | b)); | |
164 | return v.u; | |
165 | } | |
166 | #elif defined(__GNUC__) && defined(__x86_64__) | |
167 | SDL_FORCE_INLINE Uint64 | |
168 | SDL_Swap64(Uint64 x) | |
169 | { | |
170 | __asm__("bswapq %0": "=r"(x):"0"(x)); | |
171 | return x; | |
172 | } | |
173 | #else | |
174 | SDL_FORCE_INLINE Uint64 | |
175 | SDL_Swap64(Uint64 x) | |
176 | { | |
177 | Uint32 hi, lo; | |
178 | ||
179 | /* Separate into high and low 32-bit values and swap them */ | |
180 | lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF); | |
181 | x >>= 32; | |
182 | hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF); | |
183 | x = SDL_Swap32(lo); | |
184 | x <<= 32; | |
185 | x |= SDL_Swap32(hi); | |
186 | return (x); | |
187 | } | |
188 | #endif | |
189 | ||
190 | ||
191 | SDL_FORCE_INLINE float | |
192 | SDL_SwapFloat(float x) | |
193 | { | |
194 | union | |
195 | { | |
196 | float f; | |
197 | Uint32 ui32; | |
198 | } swapper; | |
199 | swapper.f = x; | |
200 | swapper.ui32 = SDL_Swap32(swapper.ui32); | |
201 | return swapper.f; | |
202 | } | |
203 | ||
204 | ||
205 | /** | |
206 | * \name Swap to native | |
207 | * Byteswap item from the specified endianness to the native endianness. | |
208 | */ | |
209 | /*@{*/ | |
210 | #if SDL_BYTEORDER == SDL_LIL_ENDIAN | |
211 | #define SDL_SwapLE16(X) (X) | |
212 | #define SDL_SwapLE32(X) (X) | |
213 | #define SDL_SwapLE64(X) (X) | |
214 | #define SDL_SwapFloatLE(X) (X) | |
215 | #define SDL_SwapBE16(X) SDL_Swap16(X) | |
216 | #define SDL_SwapBE32(X) SDL_Swap32(X) | |
217 | #define SDL_SwapBE64(X) SDL_Swap64(X) | |
218 | #define SDL_SwapFloatBE(X) SDL_SwapFloat(X) | |
219 | #else | |
220 | #define SDL_SwapLE16(X) SDL_Swap16(X) | |
221 | #define SDL_SwapLE32(X) SDL_Swap32(X) | |
222 | #define SDL_SwapLE64(X) SDL_Swap64(X) | |
223 | #define SDL_SwapFloatLE(X) SDL_SwapFloat(X) | |
224 | #define SDL_SwapBE16(X) (X) | |
225 | #define SDL_SwapBE32(X) (X) | |
226 | #define SDL_SwapBE64(X) (X) | |
227 | #define SDL_SwapFloatBE(X) (X) | |
228 | #endif | |
229 | /*@}*//*Swap to native*/ | |
230 | ||
231 | /* Ends C function definitions when using C++ */ | |
232 | #ifdef __cplusplus | |
233 | } | |
234 | #endif | |
235 | #include "close_code.h" | |
236 | ||
237 | #endif /* _SDL_endian_h */ | |
238 | ||
239 | /* vi: set ts=4 sw=4 expandtab: */ |