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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 1.80 by root, Wed Feb 22 01:52:42 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
56 typedef int ecb_bool; 72# define ECB_NO_SMP 1
73#endif
74
75#if ECB_NO_THREADS || ECB_NO_SMP
76 #define ECB_MEMORY_FENCE do { } while (0)
77#endif
78
79#ifndef ECB_MEMORY_FENCE
80 #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
81 #if __i386 || __i386__
82 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
83 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
84 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
85 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
86 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
87 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
88 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
89 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
90 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
91 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
92 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
93 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
94 #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
95 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
96 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
97 #elif __sparc || __sparc__
98 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
99 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
100 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
101 #elif defined(__s390__) || defined(__s390x__)
102 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
103 #elif defined(__mips__)
104 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
105 #endif
57 #endif 106 #endif
58#else 107#endif
59 #define ECB_INLINE static inline 108
60 typedef bool ecb_bool; 109#ifndef ECB_MEMORY_FENCE
110 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__)
111 #define ECB_MEMORY_FENCE __sync_synchronize ()
112 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
113 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
114 #elif _MSC_VER >= 1400 /* VC++ 2005 */
115 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
116 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
117 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
118 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
119 #elif defined(_WIN32)
120 #include <WinNT.h>
121 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
122 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
123 #include <mbarrier.h>
124 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
125 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
126 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
61#endif 127 #endif
128#endif
129
130#ifndef ECB_MEMORY_FENCE
131 #if !ECB_AVOID_PTHREADS
132 /*
133 * if you get undefined symbol references to pthread_mutex_lock,
134 * or failure to find pthread.h, then you should implement
135 * the ECB_MEMORY_FENCE operations for your cpu/compiler
136 * OR provide pthread.h and link against the posix thread library
137 * of your system.
138 */
139 #include <pthread.h>
140 #define ECB_NEEDS_PTHREADS 1
141 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
142
143 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
144 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
145 #endif
146#endif
147
148#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
149 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
150#endif
151
152#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
153 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
154#endif
155
156/*****************************************************************************/
157
158#define ECB_C99 (__STDC_VERSION__ >= 199901L)
159
160#if __cplusplus
161 #define ecb_inline static inline
162#elif ECB_GCC_VERSION(2,5)
163 #define ecb_inline static __inline__
164#elif ECB_C99
165 #define ecb_inline static inline
166#else
167 #define ecb_inline static
168#endif
169
170#if ECB_GCC_VERSION(3,3)
171 #define ecb_restrict __restrict__
172#elif ECB_C99
173 #define ecb_restrict restrict
174#else
175 #define ecb_restrict
176#endif
177
178typedef int ecb_bool;
62 179
63#define ECB_CONCAT_(a, b) a ## b 180#define ECB_CONCAT_(a, b) a ## b
64#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 181#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
65#define ECB_STRINGIFY_(a) # a 182#define ECB_STRINGIFY_(a) # a
66#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 183#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
67 184
68#define ECB_HEADER_INLINE ECB_INLINE 185#define ecb_function_ ecb_inline
69 186
70#if ECB_GCC_VERSION(3,1) 187#if ECB_GCC_VERSION(3,1)
71 #define ecb_attribute(attrlist) __attribute__(attrlist) 188 #define ecb_attribute(attrlist) __attribute__(attrlist)
72 #define ecb_is_constant(expr) __builtin_constant_p (expr) 189 #define ecb_is_constant(expr) __builtin_constant_p (expr)
73 #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 190 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
… …
81 198
82/* no emulation for ecb_decltype */ 199/* no emulation for ecb_decltype */
83#if ECB_GCC_VERSION(4,5) 200#if ECB_GCC_VERSION(4,5)
84 #define ecb_decltype(x) __decltype(x) 201 #define ecb_decltype(x) __decltype(x)
85#elif ECB_GCC_VERSION(3,0) 202#elif ECB_GCC_VERSION(3,0)
86 #define ecb_decltype(x) typeof(x) 203 #define ecb_decltype(x) __typeof(x)
87#endif 204#endif
88 205
89#define ecb_noinline ecb_attribute ((__noinline__)) 206#define ecb_noinline ecb_attribute ((__noinline__))
90#define ecb_noreturn ecb_attribute ((__noreturn__)) 207#define ecb_noreturn ecb_attribute ((__noreturn__))
91#define ecb_unused ecb_attribute ((__unused__)) 208#define ecb_unused ecb_attribute ((__unused__))
92#define ecb_const ecb_attribute ((__const__)) 209#define ecb_const ecb_attribute ((__const__))
93#define ecb_pure ecb_attribute ((__pure__)) 210#define ecb_pure ecb_attribute ((__pure__))
94 211
95#if ECB_GCC_VERSION(4,3) 212#if ECB_GCC_VERSION(4,3)
96 #define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */ 213 #define ecb_artificial ecb_attribute ((__artificial__))
97 #define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */ 214 #define ecb_hot ecb_attribute ((__hot__))
98 #define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */ 215 #define ecb_cold ecb_attribute ((__cold__))
99#else 216#else
100 #define ecb_artificial 217 #define ecb_artificial
101 #define ecb_hot 218 #define ecb_hot
102 #define ecb_cold 219 #define ecb_cold
103#endif 220#endif
104 221
105/* put into if's if you are very sure that the expression */ 222/* put around conditional expressions if you are very sure that the */
106/* is mostly true or mostly false. note that these return */ 223/* expression is mostly true or mostly false. note that these return */
107/* booleans, not the expression. */ 224/* booleans, not the expression. */
108#define ecb_expect_false(expr) ecb_expect (!!(expr), 0) 225#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
109#define ecb_expect_true(expr) ecb_expect (!!(expr), 1) 226#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
110/* for compatibility to the rest of the world */ 227/* for compatibility to the rest of the world */
111#define ecb_likely(expr) ecb_expect_true (expr) 228#define ecb_likely(expr) ecb_expect_true (expr)
112#define ecb_unlikely(expr) ecb_expect_false (expr) 229#define ecb_unlikely(expr) ecb_expect_false (expr)
113 230
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 */ 231/* count trailing zero bits and count # of one bits */
118#if ECB_GCC_VERSION(3,4) 232#if ECB_GCC_VERSION(3,4)
233 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
234 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
235 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
119 #define ecb_ctz32(x) __builtin_ctz (x) 236 #define ecb_ctz32(x) __builtin_ctz (x)
237 #define ecb_ctz64(x) __builtin_ctzll (x)
120 #define ecb_popcount32(x) __builtin_popcount (x) 238 #define ecb_popcount32(x) __builtin_popcount (x)
239 /* no popcountll */
121#else 240#else
122 ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; 241 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
123 ECB_HEADER_INLINE int 242 ecb_function_ int
124 ecb_ctz32 (uint32_t x) 243 ecb_ctz32 (uint32_t x)
125 { 244 {
126 int r = 0; 245 int r = 0;
127 246
128 x &= -x; /* this isolates the lowest bit */ 247 x &= ~x + 1; /* this isolates the lowest bit */
129 248
249#if ECB_branchless_on_i386
250 r += !!(x & 0xaaaaaaaa) << 0;
251 r += !!(x & 0xcccccccc) << 1;
252 r += !!(x & 0xf0f0f0f0) << 2;
253 r += !!(x & 0xff00ff00) << 3;
254 r += !!(x & 0xffff0000) << 4;
255#else
130 if (x & 0xaaaaaaaa) r += 1; 256 if (x & 0xaaaaaaaa) r += 1;
131 if (x & 0xcccccccc) r += 2; 257 if (x & 0xcccccccc) r += 2;
132 if (x & 0xf0f0f0f0) r += 4; 258 if (x & 0xf0f0f0f0) r += 4;
133 if (x & 0xff00ff00) r += 8; 259 if (x & 0xff00ff00) r += 8;
134 if (x & 0xffff0000) r += 16; 260 if (x & 0xffff0000) r += 16;
261#endif
135 262
136 return r; 263 return r;
137 } 264 }
138 265
266 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
267 ecb_function_ int
268 ecb_ctz64 (uint64_t x)
269 {
270 int shift = x & 0xffffffffU ? 0 : 32;
271 return ecb_ctz32 (x >> shift) + shift;
272 }
273
139 ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; 274 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
140 ECB_HEADER_INLINE int 275 ecb_function_ int
141 ecb_popcount32 (uint32_t x) 276 ecb_popcount32 (uint32_t x)
142 { 277 {
143 x -= (x >> 1) & 0x55555555; 278 x -= (x >> 1) & 0x55555555;
144 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 279 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
145 x = ((x >> 4) + x) & 0x0f0f0f0f; 280 x = ((x >> 4) + x) & 0x0f0f0f0f;
146 x *= 0x01010101; 281 x *= 0x01010101;
147 282
148 return x >> 24; 283 return x >> 24;
149 } 284 }
285
286 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
287 ecb_function_ int ecb_ld32 (uint32_t x)
288 {
289 int r = 0;
290
291 if (x >> 16) { x >>= 16; r += 16; }
292 if (x >> 8) { x >>= 8; r += 8; }
293 if (x >> 4) { x >>= 4; r += 4; }
294 if (x >> 2) { x >>= 2; r += 2; }
295 if (x >> 1) { r += 1; }
296
297 return r;
298 }
299
300 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
301 ecb_function_ int ecb_ld64 (uint64_t x)
302 {
303 int r = 0;
304
305 if (x >> 32) { x >>= 32; r += 32; }
306
307 return r + ecb_ld32 (x);
308 }
150#endif 309#endif
310
311ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
312ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
313{
314 return ( (x * 0x0802U & 0x22110U)
315 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
316}
317
318ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
319ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
320{
321 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
322 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
323 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
324 x = ( x >> 8 ) | ( x << 8);
325
326 return x;
327}
328
329ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
330ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
331{
332 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
333 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
334 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
335 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
336 x = ( x >> 16 ) | ( x << 16);
337
338 return x;
339}
340
341/* popcount64 is only available on 64 bit cpus as gcc builtin */
342/* so for this version we are lazy */
343ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
344ecb_function_ int
345ecb_popcount64 (uint64_t x)
346{
347 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
348}
349
350ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
351ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
352ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
353ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
354ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
355ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
356ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
357ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
358
359ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
360ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
361ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
362ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
363ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
364ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
365ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
366ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
151 367
152#if ECB_GCC_VERSION(4,3) 368#if ECB_GCC_VERSION(4,3)
153 #define ecb_bswap32(x) __builtin_bswap32 (x)
154 #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) 369 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
370 #define ecb_bswap32(x) __builtin_bswap32 (x)
371 #define ecb_bswap64(x) __builtin_bswap64 (x)
155#else 372#else
373 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
374 ecb_function_ uint16_t
375 ecb_bswap16 (uint16_t x)
376 {
377 return ecb_rotl16 (x, 8);
378 }
379
156 ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; 380 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
157 ECB_HEADER_INLINE uint32_t 381 ecb_function_ uint32_t
158 ecb_bswap32 (uint32_t x) 382 ecb_bswap32 (uint32_t x)
159 { 383 {
160 return (x >> 24) 384 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
161 | ((x >> 8) & 0x0000ff00)
162 | ((x << 8) & 0x00ff0000)
163 | (x << 24);
164 } 385 }
165 386
166 ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const; 387 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
167 ECB_HEADER_INLINE uint32_t 388 ecb_function_ uint64_t
168 ecb_bswap16 (uint32_t x) 389 ecb_bswap64 (uint64_t x)
169 { 390 {
170 return ((x >> 8) & 0xff) 391 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
171 | ((x << 8) & 0x00ff0000)
172 | (x << 24);
173 } 392 }
174#endif 393#endif
175 394
176#if ECB_GCC_VERSION(4,5) 395#if ECB_GCC_VERSION(4,5)
177 #define ecb_unreachable() __builtin_unreachable () 396 #define ecb_unreachable() __builtin_unreachable ()
178#else 397#else
179 /* this seems to work fine, but gcc always emits a warning for it :/ */ 398 /* this seems to work fine, but gcc always emits a warning for it :/ */
180 ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; 399 ecb_inline void ecb_unreachable (void) ecb_noreturn;
181 ECB_HEADER_INLINE void ecb_unreachable (void) { } 400 ecb_inline void ecb_unreachable (void) { }
182#endif 401#endif
183 402
403/* try to tell the compiler that some condition is definitely true */
404#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
405
184ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; 406ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
185ECB_HEADER_INLINE unsigned char 407ecb_inline unsigned char
186ecb_byteorder_helper (void) 408ecb_byteorder_helper (void)
187{ 409{
188 const uint32_t u = 0x11223344; 410 const uint32_t u = 0x11223344;
189 return *(unsigned char *)&u; 411 return *(unsigned char *)&u;
190} 412}
191 413
192ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; 414ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
193ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; 415ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
194ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; 416ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
195ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; 417ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
196 418
197#if ECB_GCC_VERSION(3,0) 419#if ECB_GCC_VERSION(3,0) || ECB_C99
198 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 420 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
199#else 421#else
200 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 422 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
201#endif 423#endif
202 424
425#if __cplusplus
426 template<typename T>
427 static inline T ecb_div_rd (T val, T div)
428 {
429 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
430 }
431 template<typename T>
432 static inline T ecb_div_ru (T val, T div)
433 {
434 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
435 }
436#else
437 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
438 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
439#endif
440
203#if ecb_cplusplus_does_not_suck 441#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) 442 /* 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> 443 template<typename T, int N>
206 static inline int ecb_array_length (const T (&arr)[N]) 444 static inline int ecb_array_length (const T (&arr)[N])
207 { 445 {
208 return N; 446 return N;
209 } 447 }
210#else 448#else
211 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 449 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
212#endif 450#endif
213 451
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 452#endif
229 453

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