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Comparing libecb/ecb.h (file contents):
Revision 1.37 by root, Sat Jun 11 13:47:47 2011 UTC vs.
Revision 1.77 by root, Fri Jan 27 22:28:10 2012 UTC

1/* 1/*
2 * libecb - http://software.schmorp.de/pkg/libecb 2 * libecb - http://software.schmorp.de/pkg/libecb
3 * 3 *
4 * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de> 4 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta 5 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved. 6 * All rights reserved.
7 * 7 *
8 * Redistribution and use in source and binary forms, with or without modifica- 8 * Redistribution and use in source and binary forms, with or without modifica-
9 * tion, are permitted provided that the following conditions are met: 9 * tion, are permitted provided that the following conditions are met:
… …
28 */ 28 */
29 29
30#ifndef ECB_H 30#ifndef ECB_H
31#define ECB_H 31#define ECB_H
32 32
33#ifdef _WIN32
34 typedef signed char int8_t;
35 typedef unsigned char uint8_t;
36 typedef signed short int16_t;
37 typedef unsigned short uint16_t;
38 typedef signed int int32_t;
39 typedef unsigned int uint32_t;
40 #if __GNUC__
41 typedef signed long long int64_t;
42 typedef unsigned long long uint64_t;
43 #else /* _MSC_VER || __BORLANDC__ */
44 typedef signed __int64 int64_t;
45 typedef unsigned __int64 uint64_t;
46 #endif
47#else
33#include <inttypes.h> 48 #include <inttypes.h>
49#endif
34 50
35/* many compilers define _GNUC_ to some versions but then only implement 51/* many compilers define _GNUC_ to some versions but then only implement
36 * what their idiot authors think are the "more important" extensions, 52 * what their idiot authors think are the "more important" extensions,
37 * causing enourmous grief in return for some better fake benchmark numbers. 53 * causing enormous grief in return for some better fake benchmark numbers.
38 * or so. 54 * or so.
39 * we try to detect these and simply assume they are not gcc - if they have 55 * we try to detect these and simply assume they are not gcc - if they have
40 * an issue with that they should have done it right in the first place. 56 * an issue with that they should have done it right in the first place.
41 */ 57 */
42#ifndef ECB_GCC_VERSION 58#ifndef ECB_GCC_VERSION
43 #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) 59 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
44 #define ECB_GCC_VERSION(major,minor) 0 60 #define ECB_GCC_VERSION(major,minor) 0
45 #else 61 #else
46 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 62 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
47 #endif 63 #endif
48#endif 64#endif
49 65
50#ifndef __cplusplus 66/*****************************************************************************/
51 #if __STDC_VERSION__ >= 199901L 67
52 #define ECB_INLINE static inline 68/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
53 typedef _Bool ecb_bool; 69/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
54 #else 70
55 #define ECB_INLINE static inline /* we assume the extension is ubiquituous, please tell us when we are wrong, or upgrade to the GCC */ 71#if ECB_NO_THREADS || ECB_NO_SMP
56 typedef int ecb_bool; 72 #define ECB_MEMORY_FENCE do { } while (0)
73#endif
74
75#ifndef ECB_MEMORY_FENCE
76 #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || defined(__clang__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
77 #if __i386 || __i386__
78 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
79 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
80 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
81 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
82 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
83 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
84 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
85 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
86 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
87 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
88 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
89 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
90 #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
91 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
92 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
93 #elif __sparc || __sparc__
94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
95 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
96 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
97 #elif defined(__s390__) || defined(__s390x__)
98 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
99 #endif
57 #endif 100 #endif
58#else 101#endif
59 #define ECB_INLINE static inline 102
60 typedef bool ecb_bool; 103#ifndef ECB_MEMORY_FENCE
104 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__)
105 #define ECB_MEMORY_FENCE __sync_synchronize ()
106 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
107 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
108 #elif _MSC_VER >= 1400 /* VC++ 2005 */
109 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
110 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
111 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
112 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
113 #elif defined(_WIN32)
114 #include <WinNT.h>
115 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
116 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
117 #include <mbarrier.h>
118 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
119 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
120 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
61#endif 121 #endif
122#endif
123
124#ifndef ECB_MEMORY_FENCE
125 #if !ECB_AVOID_PTHREADS
126 /*
127 * if you get undefined symbol references to pthread_mutex_lock,
128 * or failure to find pthread.h, then you should implement
129 * the ECB_MEMORY_FENCE operations for your cpu/compiler
130 * OR provide pthread.h and link against the posix thread library
131 * of your system.
132 */
133 #include <pthread.h>
134 #define ECB_NEEDS_PTHREADS 1
135 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
136
137 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
138 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
139 #endif
140#endif
141
142#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
143 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
144#endif
145
146#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
147 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
148#endif
149
150/*****************************************************************************/
151
152#define ECB_C99 (__STDC_VERSION__ >= 199901L)
153
154#if __cplusplus
155 #define ecb_inline static inline
156#elif ECB_GCC_VERSION(2,5)
157 #define ecb_inline static __inline__
158#elif ECB_C99
159 #define ecb_inline static inline
160#else
161 #define ecb_inline static
162#endif
163
164#if ECB_GCC_VERSION(3,3)
165 #define ecb_restrict __restrict__
166#elif ECB_C99
167 #define ecb_restrict restrict
168#else
169 #define ecb_restrict
170#endif
171
172typedef int ecb_bool;
62 173
63#define ECB_CONCAT_(a, b) a ## b 174#define ECB_CONCAT_(a, b) a ## b
64#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 175#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
65#define ECB_STRINGIFY_(a) # a 176#define ECB_STRINGIFY_(a) # a
66#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 177#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
67 178
68#define ECB_HEADER_INLINE ECB_INLINE 179#define ecb_function_ ecb_inline
69 180
70#if ECB_GCC_VERSION(3,1) 181#if ECB_GCC_VERSION(3,1)
71 #define ecb_attribute(attrlist) __attribute__(attrlist) 182 #define ecb_attribute(attrlist) __attribute__(attrlist)
72 #define ecb_is_constant(expr) __builtin_constant_p (expr) 183 #define ecb_is_constant(expr) __builtin_constant_p (expr)
73 #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 184 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
… …
81 192
82/* no emulation for ecb_decltype */ 193/* no emulation for ecb_decltype */
83#if ECB_GCC_VERSION(4,5) 194#if ECB_GCC_VERSION(4,5)
84 #define ecb_decltype(x) __decltype(x) 195 #define ecb_decltype(x) __decltype(x)
85#elif ECB_GCC_VERSION(3,0) 196#elif ECB_GCC_VERSION(3,0)
86 #define ecb_decltype(x) typeof(x) 197 #define ecb_decltype(x) __typeof(x)
87#endif 198#endif
88 199
89#define ecb_noinline ecb_attribute ((__noinline__)) 200#define ecb_noinline ecb_attribute ((__noinline__))
90#define ecb_noreturn ecb_attribute ((__noreturn__)) 201#define ecb_noreturn ecb_attribute ((__noreturn__))
91#define ecb_unused ecb_attribute ((__unused__)) 202#define ecb_unused ecb_attribute ((__unused__))
92#define ecb_const ecb_attribute ((__const__)) 203#define ecb_const ecb_attribute ((__const__))
93#define ecb_pure ecb_attribute ((__pure__)) 204#define ecb_pure ecb_attribute ((__pure__))
94 205
95#if ECB_GCC_VERSION(4,3) 206#if ECB_GCC_VERSION(4,3)
96 #define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */ 207 #define ecb_artificial ecb_attribute ((__artificial__))
97 #define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */ 208 #define ecb_hot ecb_attribute ((__hot__))
98 #define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */ 209 #define ecb_cold ecb_attribute ((__cold__))
99#else 210#else
100 #define ecb_artificial 211 #define ecb_artificial
101 #define ecb_hot 212 #define ecb_hot
102 #define ecb_cold 213 #define ecb_cold
103#endif 214#endif
104 215
105/* put into if's if you are very sure that the expression */ 216/* put around conditional expressions if you are very sure that the */
106/* is mostly true or mostly false. note that these return */ 217/* expression is mostly true or mostly false. note that these return */
107/* booleans, not the expression. */ 218/* booleans, not the expression. */
108#define ecb_expect_false(expr) ecb_expect (!!(expr), 0) 219#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
109#define ecb_expect_true(expr) ecb_expect (!!(expr), 1) 220#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
110/* for compatibility to the rest of the world */ 221/* for compatibility to the rest of the world */
111#define ecb_likely(expr) ecb_expect_true (expr) 222#define ecb_likely(expr) ecb_expect_true (expr)
112#define ecb_unlikely(expr) ecb_expect_false (expr) 223#define ecb_unlikely(expr) ecb_expect_false (expr)
113 224
114/* try to tell the compiler that some condition is definitely true */
115#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
116
117/* count trailing zero bits and count # of one bits */ 225/* count trailing zero bits and count # of one bits */
118#if ECB_GCC_VERSION(3,4) 226#if ECB_GCC_VERSION(3,4)
227 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
228 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
229 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
119 #define ecb_ctz32(x) __builtin_ctz (x) 230 #define ecb_ctz32(x) __builtin_ctz (x)
231 #define ecb_ctz64(x) __builtin_ctzll (x)
120 #define ecb_popcount32(x) __builtin_popcount (x) 232 #define ecb_popcount32(x) __builtin_popcount (x)
233 /* no popcountll */
121#else 234#else
122 ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; 235 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
123 ECB_HEADER_INLINE int 236 ecb_function_ int
124 ecb_ctz32 (uint32_t x) 237 ecb_ctz32 (uint32_t x)
125 { 238 {
126 int r = 0; 239 int r = 0;
127 240
128 x &= -x; /* this isolates the lowest bit */ 241 x &= ~x + 1; /* this isolates the lowest bit */
129 242
243#if ECB_branchless_on_i386
244 r += !!(x & 0xaaaaaaaa) << 0;
245 r += !!(x & 0xcccccccc) << 1;
246 r += !!(x & 0xf0f0f0f0) << 2;
247 r += !!(x & 0xff00ff00) << 3;
248 r += !!(x & 0xffff0000) << 4;
249#else
130 if (x & 0xaaaaaaaa) r += 1; 250 if (x & 0xaaaaaaaa) r += 1;
131 if (x & 0xcccccccc) r += 2; 251 if (x & 0xcccccccc) r += 2;
132 if (x & 0xf0f0f0f0) r += 4; 252 if (x & 0xf0f0f0f0) r += 4;
133 if (x & 0xff00ff00) r += 8; 253 if (x & 0xff00ff00) r += 8;
134 if (x & 0xffff0000) r += 16; 254 if (x & 0xffff0000) r += 16;
255#endif
135 256
136 return r; 257 return r;
137 } 258 }
138 259
260 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
261 ecb_function_ int
262 ecb_ctz64 (uint64_t x)
263 {
264 int shift = x & 0xffffffffU ? 0 : 32;
265 return ecb_ctz32 (x >> shift) + shift;
266 }
267
139 ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; 268 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
140 ECB_HEADER_INLINE int 269 ecb_function_ int
141 ecb_popcount32 (uint32_t x) 270 ecb_popcount32 (uint32_t x)
142 { 271 {
143 x -= (x >> 1) & 0x55555555; 272 x -= (x >> 1) & 0x55555555;
144 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 273 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
145 x = ((x >> 4) + x) & 0x0f0f0f0f; 274 x = ((x >> 4) + x) & 0x0f0f0f0f;
146 x *= 0x01010101; 275 x *= 0x01010101;
147 276
148 return x >> 24; 277 return x >> 24;
149 } 278 }
279
280 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
281 ecb_function_ int ecb_ld32 (uint32_t x)
282 {
283 int r = 0;
284
285 if (x >> 16) { x >>= 16; r += 16; }
286 if (x >> 8) { x >>= 8; r += 8; }
287 if (x >> 4) { x >>= 4; r += 4; }
288 if (x >> 2) { x >>= 2; r += 2; }
289 if (x >> 1) { r += 1; }
290
291 return r;
292 }
293
294 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
295 ecb_function_ int ecb_ld64 (uint64_t x)
296 {
297 int r = 0;
298
299 if (x >> 32) { x >>= 32; r += 32; }
300
301 return r + ecb_ld32 (x);
302 }
150#endif 303#endif
304
305ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
306ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
307{
308 return ( (x * 0x0802U & 0x22110U)
309 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
310}
311
312ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
313ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
314{
315 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
316 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
317 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
318 x = ( x >> 8 ) | ( x << 8);
319
320 return x;
321}
322
323ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
324ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
325{
326 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
327 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
328 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
329 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
330 x = ( x >> 16 ) | ( x << 16);
331
332 return x;
333}
334
335/* popcount64 is only available on 64 bit cpus as gcc builtin */
336/* so for this version we are lazy */
337ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
338ecb_function_ int
339ecb_popcount64 (uint64_t x)
340{
341 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
342}
343
344ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
345ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
346ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
347ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
348ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
349ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
350ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
351ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
352
353ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
354ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
355ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
356ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
357ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
358ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
359ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
360ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
151 361
152#if ECB_GCC_VERSION(4,3) 362#if ECB_GCC_VERSION(4,3)
153 #define ecb_bswap32(x) __builtin_bswap32 (x)
154 #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) 363 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
364 #define ecb_bswap32(x) __builtin_bswap32 (x)
365 #define ecb_bswap64(x) __builtin_bswap64 (x)
155#else 366#else
367 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
368 ecb_function_ uint16_t
369 ecb_bswap16 (uint16_t x)
370 {
371 return ecb_rotl16 (x, 8);
372 }
373
156 ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; 374 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
157 ECB_HEADER_INLINE uint32_t 375 ecb_function_ uint32_t
158 ecb_bswap32 (uint32_t x) 376 ecb_bswap32 (uint32_t x)
159 { 377 {
160 return (x >> 24) 378 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
161 | ((x >> 8) & 0x0000ff00)
162 | ((x << 8) & 0x00ff0000)
163 | (x << 24);
164 } 379 }
165 380
166 ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const; 381 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
167 ECB_HEADER_INLINE uint32_t 382 ecb_function_ uint64_t
168 ecb_bswap16 (uint32_t x) 383 ecb_bswap64 (uint64_t x)
169 { 384 {
170 return ((x >> 8) & 0xff) 385 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
171 | ((x << 8) & 0x00ff0000)
172 | (x << 24);
173 } 386 }
174#endif 387#endif
175 388
176#if ECB_GCC_VERSION(4,5) 389#if ECB_GCC_VERSION(4,5)
177 #define ecb_unreachable() __builtin_unreachable () 390 #define ecb_unreachable() __builtin_unreachable ()
178#else 391#else
179 /* this seems to work fine, but gcc always emits a warning for it :/ */ 392 /* this seems to work fine, but gcc always emits a warning for it :/ */
180 ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; 393 ecb_inline void ecb_unreachable (void) ecb_noreturn;
181 ECB_HEADER_INLINE void ecb_unreachable (void) { } 394 ecb_inline void ecb_unreachable (void) { }
182#endif 395#endif
183 396
397/* try to tell the compiler that some condition is definitely true */
398#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
399
184ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; 400ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
185ECB_HEADER_INLINE unsigned char 401ecb_inline unsigned char
186ecb_byteorder_helper (void) 402ecb_byteorder_helper (void)
187{ 403{
188 const uint32_t u = 0x11223344; 404 const uint32_t u = 0x11223344;
189 return *(unsigned char *)&u; 405 return *(unsigned char *)&u;
190} 406}
191 407
192ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; 408ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
193ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; 409ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
194ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; 410ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
195ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; 411ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
196 412
197#if ECB_GCC_VERSION(3,0) 413#if ECB_GCC_VERSION(3,0) || ECB_C99
198 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 414 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
199#else 415#else
200 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 416 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
201#endif 417#endif
202 418
419#if __cplusplus
420 template<typename T>
421 static inline T ecb_div_rd (T val, T div)
422 {
423 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
424 }
425 template<typename T>
426 static inline T ecb_div_ru (T val, T div)
427 {
428 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
429 }
430#else
431 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
432 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
433#endif
434
203#if ecb_cplusplus_does_not_suck 435#if ecb_cplusplus_does_not_suck
204 // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) 436 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
205 template<typename T, int N> 437 template<typename T, int N>
206 static inline int ecb_array_length (const T (&arr)[N]) 438 static inline int ecb_array_length (const T (&arr)[N])
207 { 439 {
208 return N; 440 return N;
209 } 441 }
210#else 442#else
211 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 443 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
212#endif 444#endif
213 445
214ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
215ECB_INLINE uint32_t
216ecb_rotr32 (uint32_t x, unsigned int count)
217{
218 return (x << (32 - count)) | (x >> count);
219}
220
221ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
222ECB_INLINE uint32_t
223ecb_rotl32 (uint32_t x, unsigned int count)
224{
225 return (x >> (32 - count)) | (x << count);
226}
227
228#endif 446#endif
229 447

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