1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2021 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 #ifdef _MSC_VER
HexagonDAGToDAGISel(HexagonTargetMachine & tm,CodeGenOpt::Level OptLevel)34 /* As of Clang 11, '_m_prefetchw' is conflicting with the winnt.h's version,
35 so we define the needed '_m_prefetch' here as a pseudo-header, until the issue is fixed. */
36
37 #ifdef __clang__
38 #ifndef __PRFCHWINTRIN_H
39 #define __PRFCHWINTRIN_H
40
41 static __inline__ void __attribute__((__always_inline__, __nodebug__))
42 _m_prefetch(void *__P)
43 {
44 __builtin_prefetch (__P, 0, 3 /* _MM_HINT_T0 */);
45 }
46
47 #endif /* __PRFCHWINTRIN_H */
48 #endif /* __clang__ */
ComplexPatternFuncMutatesDAG()49
50 #include <intrin.h>
51 #endif
52
53 /**
54 * \name The two types of endianness
55 */
56 /* @{ */
57 #define SDL_LIL_ENDIAN 1234
58 #define SDL_BIG_ENDIAN 4321
59 /* @} */
60
61 #ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */
62 #ifdef __linux__
63 #include <endian.h>
64 #define SDL_BYTEORDER __BYTE_ORDER
65 #elif defined(__OpenBSD__)
66 #include <endian.h>
67 #define SDL_BYTEORDER BYTE_ORDER
68 #elif defined(__FreeBSD__) || defined(__NetBSD__)
69 #include <sys/endian.h>
70 #define SDL_BYTEORDER BYTE_ORDER
71 #else
72 #if defined(__hppa__) || \
73 defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
74 (defined(__MIPS__) && defined(__MIPSEB__)) || \
75 defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \
76 defined(__sparc__)
77 #define SDL_BYTEORDER SDL_BIG_ENDIAN
78 #else
79 #define SDL_BYTEORDER SDL_LIL_ENDIAN
80 #endif
81 #endif /* __linux__ */
82 #endif /* !SDL_BYTEORDER */
83
84
85 #include "begin_code.h"
86 /* Set up for C function definitions, even when using C++ */
87 #ifdef __cplusplus
88 extern "C" {
89 #endif
90
91 /**
92 * \file SDL_endian.h
93 */
94 #if (defined(__clang__) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 2))) || \
95 (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))
96 #define SDL_Swap16(x) __builtin_bswap16(x)
97 #elif defined(__GNUC__) && defined(__i386__) && \
98 !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
99 SDL_FORCE_INLINE Uint16
100 SDL_Swap16(Uint16 x)
101 {
102 __asm__("xchgb %b0,%h0": "=q"(x):"0"(x));
103 return x;
104 }
105 #elif defined(__GNUC__) && defined(__x86_64__)
106 SDL_FORCE_INLINE Uint16
107 SDL_Swap16(Uint16 x)
108 {
109 __asm__("xchgb %b0,%h0": "=Q"(x):"0"(x));
110 return x;
111 }
112 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
113 SDL_FORCE_INLINE Uint16
114 SDL_Swap16(Uint16 x)
115 {
116 int result;
117
118 __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x));
119 return (Uint16)result;
120 }
121 #elif defined(__GNUC__) && defined(__aarch64__)
122 SDL_FORCE_INLINE Uint16
123 SDL_Swap16(Uint16 x)
124 {
125 __asm__("rev16 %w1, %w0" : "=r"(x) : "r"(x));
126 return x;
127 }
128 #elif defined(__GNUC__) && (defined(__m68k__) && !defined(__mcoldfire__))
129 SDL_FORCE_INLINE Uint16
130 SDL_Swap16(Uint16 x)
131 {
132 __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc");
133 return x;
134 }
135 #elif defined(_MSC_VER)
136 #pragma intrinsic(_byteswap_ushort)
137 #define SDL_Swap16(x) _byteswap_ushort(x)
138 #elif defined(__WATCOMC__) && defined(__386__)
139 extern _inline Uint16 SDL_Swap16(Uint16);
140 #pragma aux SDL_Swap16 = \
141 "xchg al, ah" \
142 parm [ax] \
143 modify [ax];
144 #else
145 SDL_FORCE_INLINE Uint16
146 SDL_Swap16(Uint16 x)
147 {
148 return SDL_static_cast(Uint16, ((x << 8) | (x >> 8)));
149 }
150 #endif
151
152 #if (defined(__clang__) && (__clang_major__ > 2 || (__clang_major__ == 2 && __clang_minor__ >= 6))) || \
153 (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)))
154 #define SDL_Swap32(x) __builtin_bswap32(x)
155 #elif defined(__GNUC__) && defined(__i386__) && \
156 !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
157 SDL_FORCE_INLINE Uint32
158 SDL_Swap32(Uint32 x)
159 {
160 __asm__("bswap %0": "=r"(x):"0"(x));
161 return x;
162 }
163 #elif defined(__GNUC__) && defined(__x86_64__)
164 SDL_FORCE_INLINE Uint32
165 SDL_Swap32(Uint32 x)
166 {
167 __asm__("bswapl %0": "=r"(x):"0"(x));
168 return x;
169 }
170 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
171 SDL_FORCE_INLINE Uint32
172 SDL_Swap32(Uint32 x)
173 {
174 Uint32 result;
175
176 __asm__("rlwimi %0,%2,24,16,23": "=&r"(result): "0" (x>>24), "r"(x));
177 __asm__("rlwimi %0,%2,8,8,15" : "=&r"(result): "0" (result), "r"(x));
178 __asm__("rlwimi %0,%2,24,0,7" : "=&r"(result): "0" (result), "r"(x));
179 return result;
180 }
181 #elif defined(__GNUC__) && defined(__aarch64__)
182 SDL_FORCE_INLINE Uint32
183 SDL_Swap32(Uint32 x)
184 {
185 __asm__("rev %w1, %w0": "=r"(x):"r"(x));
186 return x;
187 }
188 #elif defined(__GNUC__) && (defined(__m68k__) && !defined(__mcoldfire__))
189 SDL_FORCE_INLINE Uint32
190 SDL_Swap32(Uint32 x)
191 {
192 __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc");
193 return x;
194 }
195 #elif defined(__WATCOMC__) && defined(__386__)
196 extern _inline Uint32 SDL_Swap32(Uint32);
197 #pragma aux SDL_Swap32 = \
198 "bswap eax" \
199 parm [eax] \
200 modify [eax];
201 #elif defined(_MSC_VER)
202 #pragma intrinsic(_byteswap_ulong)
203 #define SDL_Swap32(x) _byteswap_ulong(x)
204 #else
205 SDL_FORCE_INLINE Uint32
206 SDL_Swap32(Uint32 x)
207 {
208 return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) |
209 ((x >> 8) & 0x0000FF00) | (x >> 24)));
210 }
211 #endif
212
213 #if (defined(__clang__) && (__clang_major__ > 2 || (__clang_major__ == 2 && __clang_minor__ >= 6))) || \
214 (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)))
215 #define SDL_Swap64(x) __builtin_bswap64(x)
216 #elif defined(__GNUC__) && defined(__i386__) && \
217 !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
218 SDL_FORCE_INLINE Uint64
219 SDL_Swap64(Uint64 x)
220 {
221 union {
222 struct {
223 Uint32 a, b;
224 } s;
225 Uint64 u;
226 } v;
227 v.u = x;
228 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
229 : "=r"(v.s.a), "=r"(v.s.b)
230 : "0" (v.s.a), "1"(v.s.b));
231 return v.u;
232 }
233 #elif defined(__GNUC__) && defined(__x86_64__)
234 SDL_FORCE_INLINE Uint64
235 SDL_Swap64(Uint64 x)
236 {
237 __asm__("bswapq %0": "=r"(x):"0"(x));
238 return x;
239 }
240 #elif defined(__WATCOMC__) && defined(__386__)
241 extern _inline Uint64 SDL_Swap64(Uint64);
242 #pragma aux SDL_Swap64 = \
243 "bswap eax" \
244 "bswap edx" \
245 "xchg eax,edx" \
246 parm [eax edx] \
247 modify [eax edx];
248 #elif defined(_MSC_VER)
249 #pragma intrinsic(_byteswap_uint64)
250 #define SDL_Swap64(x) _byteswap_uint64(x)
251 #else
252 SDL_FORCE_INLINE Uint64
253 SDL_Swap64(Uint64 x)
254 {
255 Uint32 hi, lo;
256
257 /* Separate into high and low 32-bit values and swap them */
258 lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
259 x >>= 32;
260 hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
261 x = SDL_Swap32(lo);
262 x <<= 32;
263 x |= SDL_Swap32(hi);
264 return (x);
265 }
266 #endif
267
268
269 SDL_FORCE_INLINE float
270 SDL_SwapFloat(float x)
271 {
272 union {
273 float f;
274 Uint32 ui32;
275 } swapper;
276 swapper.f = x;
277 swapper.ui32 = SDL_Swap32(swapper.ui32);
278 return swapper.f;
279 }
280
281
282 /**
283 * \name Swap to native
284 * Byteswap item from the specified endianness to the native endianness.
285 */
286 /* @{ */
287 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
288 #define SDL_SwapLE16(X) (X)
289 #define SDL_SwapLE32(X) (X)
290 #define SDL_SwapLE64(X) (X)
291 #define SDL_SwapFloatLE(X) (X)
292 #define SDL_SwapBE16(X) SDL_Swap16(X)
293 #define SDL_SwapBE32(X) SDL_Swap32(X)
294 #define SDL_SwapBE64(X) SDL_Swap64(X)
295 #define SDL_SwapFloatBE(X) SDL_SwapFloat(X)
296 #else
297 #define SDL_SwapLE16(X) SDL_Swap16(X)
298 #define SDL_SwapLE32(X) SDL_Swap32(X)
299 #define SDL_SwapLE64(X) SDL_Swap64(X)
300 #define SDL_SwapFloatLE(X) SDL_SwapFloat(X)
301 #define SDL_SwapBE16(X) (X)
302 #define SDL_SwapBE32(X) (X)
303 #define SDL_SwapBE64(X) (X)
304 #define SDL_SwapFloatBE(X) (X)
305 #endif
306 /* @} *//* Swap to native */
307
308 /* Ends C function definitions when using C++ */
309 #ifdef __cplusplus
310 }
311 #endif
312 #include "close_code.h"
313
314 #endif /* SDL_endian_h_ */
315
316 /* vi: set ts=4 sw=4 expandtab: */
317