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Comparing libecb/ecb.h (file contents):
Revision 1.38 by root, Sat Jun 11 14:02:40 2011 UTC vs.
Revision 1.109 by root, Fri Jun 29 14:05:50 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/* 16 bits major, 16 bits minor */
34#define ECB_VERSION 0x00010001
35
36#ifdef _WIN32
37 typedef signed char int8_t;
38 typedef unsigned char uint8_t;
39 typedef signed short int16_t;
40 typedef unsigned short uint16_t;
41 typedef signed int int32_t;
42 typedef unsigned int uint32_t;
43 #if __GNUC__
44 typedef signed long long int64_t;
45 typedef unsigned long long uint64_t;
46 #else /* _MSC_VER || __BORLANDC__ */
47 typedef signed __int64 int64_t;
48 typedef unsigned __int64 uint64_t;
49 #endif
50 #ifdef _WIN64
51 #define ECB_PTRSIZE 8
52 typedef uint64_t uintptr_t;
53 typedef int64_t intptr_t;
54 #else
55 #define ECB_PTRSIZE 4
56 typedef uint32_t uintptr_t;
57 typedef int32_t intptr_t;
58 #endif
59#else
33#include <inttypes.h> 60 #include <inttypes.h>
61 #if UINTMAX_MAX > 0xffffffffU
62 #define ECB_PTRSIZE 8
63 #else
64 #define ECB_PTRSIZE 4
65 #endif
66#endif
34 67
35/* many compilers define _GNUC_ to some versions but then only implement 68/* many compilers define _GNUC_ to some versions but then only implement
36 * what their idiot authors think are the "more important" extensions, 69 * what their idiot authors think are the "more important" extensions,
37 * causing enourmous grief in return for some better fake benchmark numbers. 70 * causing enormous grief in return for some better fake benchmark numbers.
38 * or so. 71 * or so.
39 * we try to detect these and simply assume they are not gcc - if they have 72 * 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. 73 * an issue with that they should have done it right in the first place.
41 */ 74 */
42#ifndef ECB_GCC_VERSION 75#ifndef ECB_GCC_VERSION
43 #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) 76 #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 77 #define ECB_GCC_VERSION(major,minor) 0
45 #else 78 #else
46 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 79 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
47 #endif 80 #endif
48#endif 81#endif
49 82
83#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
84#define ECB_C99 (__STDC_VERSION__ >= 199901L)
85#define ECB_C11 (__STDC_VERSION__ >= 201112L)
86#define ECB_CPP (__cplusplus+0)
87#define ECB_CPP11 (__cplusplus >= 201103L)
88
89#if ECB_CPP
90 #define ECB_EXTERN_C extern "C"
91 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
92 #define ECB_EXTERN_C_END }
93#else
94 #define ECB_EXTERN_C extern
95 #define ECB_EXTERN_C_BEG
96 #define ECB_EXTERN_C_END
97#endif
98
99/*****************************************************************************/
100
101/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
102/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
103
104#if ECB_NO_THREADS
105 #define ECB_NO_SMP 1
106#endif
107
108#if ECB_NO_SMP
109 #define ECB_MEMORY_FENCE do { } while (0)
110#endif
111
112#ifndef ECB_MEMORY_FENCE
113 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
114 #if __i386 || __i386__
115 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
116 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
117 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
118 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
119 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
120 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
121 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
122 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
123 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
124 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
125 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
126 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
127 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
128 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
129 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
130 #elif __sparc || __sparc__
131 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
132 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
133 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
134 #elif defined __s390__ || defined __s390x__
135 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
136 #elif defined __mips__
137 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
138 #elif defined __alpha__
139 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
140 #elif defined __hppa__
141 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
142 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
143 #elif defined __ia64__
144 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
145 #endif
146 #endif
147#endif
148
149#ifndef ECB_MEMORY_FENCE
150 #if ECB_GCC_VERSION(4,7)
151 /* see comment below (stdatomic.h) about the C11 memory model. */
152 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
153 /*#elif defined __clang && __has_feature (cxx_atomic)*/
154 /* see comment below (stdatomic.h) about the C11 memory model. */
155 /*#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)*/
156 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
157 #define ECB_MEMORY_FENCE __sync_synchronize ()
158 #elif _MSC_VER >= 1400 /* VC++ 2005 */
159 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
160 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
161 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
162 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
163 #elif defined _WIN32
164 #include <WinNT.h>
165 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
166 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
167 #include <mbarrier.h>
168 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
169 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
170 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
171 #elif __xlC__
172 #define ECB_MEMORY_FENCE __sync ()
173 #endif
174#endif
175
176#ifndef ECB_MEMORY_FENCE
177 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
178 /* we assume that these memory fences work on all variables/all memory accesses, */
179 /* not just C11 atomics and atomic accesses */
180 #include <stdatomic.h>
181 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
182 /* any fence other than seq_cst, which isn't very efficient for us. */
183 /* Why that is, we don't know - either the C11 memory model is quite useless */
184 /* for most usages, or gcc and clang have a bug */
185 /* I *currently* lean towards the latter, and inefficiently implement */
186 /* all three of ecb's fences as a seq_cst fence */
187 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
188 #endif
189#endif
190
191#ifndef ECB_MEMORY_FENCE
192 #if !ECB_AVOID_PTHREADS
193 /*
194 * if you get undefined symbol references to pthread_mutex_lock,
195 * or failure to find pthread.h, then you should implement
196 * the ECB_MEMORY_FENCE operations for your cpu/compiler
197 * OR provide pthread.h and link against the posix thread library
198 * of your system.
199 */
200 #include <pthread.h>
201 #define ECB_NEEDS_PTHREADS 1
202 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
203
204 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
205 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
206 #endif
207#endif
208
209#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
210 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
211#endif
212
213#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
214 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
215#endif
216
217/*****************************************************************************/
218
50#ifdef __cplusplus 219#if __cplusplus
51 #define ECB_INLINE static inline 220 #define ecb_inline static inline
52#elif ECB_GCC_VERSION(2,5) 221#elif ECB_GCC_VERSION(2,5)
53 #define ECB_INLINE static __inline__ 222 #define ecb_inline static __inline__
54#elif __STDC_VERSION__ >= 199901L 223#elif ECB_C99
55 #define ECB_INLINE static inline 224 #define ecb_inline static inline
56#else 225#else
57 #define ECB_INLINE static 226 #define ecb_inline static
58#endif 227#endif
59 228
60#if ECB_GCC_VERSION(3,3) 229#if ECB_GCC_VERSION(3,3)
61 #define ecb_restrict __restrict__ 230 #define ecb_restrict __restrict__
62#elif __STDC_VERSION__ >= 199901L 231#elif ECB_C99
63 #define ecb_restrict restrict 232 #define ecb_restrict restrict
64#else 233#else
65 #define ecb_restrict 234 #define ecb_restrict
66#endif 235#endif
67 236
… …
70#define ECB_CONCAT_(a, b) a ## b 239#define ECB_CONCAT_(a, b) a ## b
71#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 240#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
72#define ECB_STRINGIFY_(a) # a 241#define ECB_STRINGIFY_(a) # a
73#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 242#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
74 243
75#define ECB_HEADER_INLINE ECB_INLINE 244#define ecb_function_ ecb_inline
76 245
77#if ECB_GCC_VERSION(3,1) 246#if ECB_GCC_VERSION(3,1)
78 #define ecb_attribute(attrlist) __attribute__(attrlist) 247 #define ecb_attribute(attrlist) __attribute__(attrlist)
79 #define ecb_is_constant(expr) __builtin_constant_p (expr) 248 #define ecb_is_constant(expr) __builtin_constant_p (expr)
80 #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 249 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
… …
88 257
89/* no emulation for ecb_decltype */ 258/* no emulation for ecb_decltype */
90#if ECB_GCC_VERSION(4,5) 259#if ECB_GCC_VERSION(4,5)
91 #define ecb_decltype(x) __decltype(x) 260 #define ecb_decltype(x) __decltype(x)
92#elif ECB_GCC_VERSION(3,0) 261#elif ECB_GCC_VERSION(3,0)
93 #define ecb_decltype(x) typeof(x) 262 #define ecb_decltype(x) __typeof(x)
94#endif 263#endif
95 264
96#define ecb_noinline ecb_attribute ((__noinline__)) 265#define ecb_noinline ecb_attribute ((__noinline__))
97#define ecb_noreturn ecb_attribute ((__noreturn__))
98#define ecb_unused ecb_attribute ((__unused__)) 266#define ecb_unused ecb_attribute ((__unused__))
99#define ecb_const ecb_attribute ((__const__)) 267#define ecb_const ecb_attribute ((__const__))
100#define ecb_pure ecb_attribute ((__pure__)) 268#define ecb_pure ecb_attribute ((__pure__))
101 269
270#if ECB_C11
271 #define ecb_noreturn _Noreturn
272#else
273 #define ecb_noreturn ecb_attribute ((__noreturn__))
274#endif
275
102#if ECB_GCC_VERSION(4,3) 276#if ECB_GCC_VERSION(4,3)
103 #define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */ 277 #define ecb_artificial ecb_attribute ((__artificial__))
104 #define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */ 278 #define ecb_hot ecb_attribute ((__hot__))
105 #define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */ 279 #define ecb_cold ecb_attribute ((__cold__))
106#else 280#else
107 #define ecb_artificial 281 #define ecb_artificial
108 #define ecb_hot 282 #define ecb_hot
109 #define ecb_cold 283 #define ecb_cold
110#endif 284#endif
111 285
112/* put into if's if you are very sure that the expression */ 286/* put around conditional expressions if you are very sure that the */
113/* is mostly true or mostly false. note that these return */ 287/* expression is mostly true or mostly false. note that these return */
114/* booleans, not the expression. */ 288/* booleans, not the expression. */
115#define ecb_expect_false(expr) ecb_expect (!!(expr), 0) 289#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
116#define ecb_expect_true(expr) ecb_expect (!!(expr), 1) 290#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
117/* for compatibility to the rest of the world */ 291/* for compatibility to the rest of the world */
118#define ecb_likely(expr) ecb_expect_true (expr) 292#define ecb_likely(expr) ecb_expect_true (expr)
119#define ecb_unlikely(expr) ecb_expect_false (expr) 293#define ecb_unlikely(expr) ecb_expect_false (expr)
120 294
121/* try to tell the compiler that some condition is definitely true */
122#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
123
124/* count trailing zero bits and count # of one bits */ 295/* count trailing zero bits and count # of one bits */
125#if ECB_GCC_VERSION(3,4) 296#if ECB_GCC_VERSION(3,4)
297 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
298 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
299 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
126 #define ecb_ctz32(x) __builtin_ctz (x) 300 #define ecb_ctz32(x) __builtin_ctz (x)
301 #define ecb_ctz64(x) __builtin_ctzll (x)
127 #define ecb_popcount32(x) __builtin_popcount (x) 302 #define ecb_popcount32(x) __builtin_popcount (x)
303 /* no popcountll */
128#else 304#else
129 ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; 305 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
130 ECB_HEADER_INLINE int 306 ecb_function_ int
131 ecb_ctz32 (uint32_t x) 307 ecb_ctz32 (uint32_t x)
132 { 308 {
133 int r = 0; 309 int r = 0;
134 310
135 x &= -x; /* this isolates the lowest bit */ 311 x &= ~x + 1; /* this isolates the lowest bit */
136 312
313#if ECB_branchless_on_i386
314 r += !!(x & 0xaaaaaaaa) << 0;
315 r += !!(x & 0xcccccccc) << 1;
316 r += !!(x & 0xf0f0f0f0) << 2;
317 r += !!(x & 0xff00ff00) << 3;
318 r += !!(x & 0xffff0000) << 4;
319#else
137 if (x & 0xaaaaaaaa) r += 1; 320 if (x & 0xaaaaaaaa) r += 1;
138 if (x & 0xcccccccc) r += 2; 321 if (x & 0xcccccccc) r += 2;
139 if (x & 0xf0f0f0f0) r += 4; 322 if (x & 0xf0f0f0f0) r += 4;
140 if (x & 0xff00ff00) r += 8; 323 if (x & 0xff00ff00) r += 8;
141 if (x & 0xffff0000) r += 16; 324 if (x & 0xffff0000) r += 16;
325#endif
142 326
143 return r; 327 return r;
144 } 328 }
145 329
330 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
331 ecb_function_ int
332 ecb_ctz64 (uint64_t x)
333 {
334 int shift = x & 0xffffffffU ? 0 : 32;
335 return ecb_ctz32 (x >> shift) + shift;
336 }
337
146 ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; 338 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
147 ECB_HEADER_INLINE int 339 ecb_function_ int
148 ecb_popcount32 (uint32_t x) 340 ecb_popcount32 (uint32_t x)
149 { 341 {
150 x -= (x >> 1) & 0x55555555; 342 x -= (x >> 1) & 0x55555555;
151 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 343 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
152 x = ((x >> 4) + x) & 0x0f0f0f0f; 344 x = ((x >> 4) + x) & 0x0f0f0f0f;
153 x *= 0x01010101; 345 x *= 0x01010101;
154 346
155 return x >> 24; 347 return x >> 24;
156 } 348 }
349
350 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
351 ecb_function_ int ecb_ld32 (uint32_t x)
352 {
353 int r = 0;
354
355 if (x >> 16) { x >>= 16; r += 16; }
356 if (x >> 8) { x >>= 8; r += 8; }
357 if (x >> 4) { x >>= 4; r += 4; }
358 if (x >> 2) { x >>= 2; r += 2; }
359 if (x >> 1) { r += 1; }
360
361 return r;
362 }
363
364 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
365 ecb_function_ int ecb_ld64 (uint64_t x)
366 {
367 int r = 0;
368
369 if (x >> 32) { x >>= 32; r += 32; }
370
371 return r + ecb_ld32 (x);
372 }
157#endif 373#endif
374
375ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
376ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
377ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
378ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
379
380ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
381ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
382{
383 return ( (x * 0x0802U & 0x22110U)
384 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
385}
386
387ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
388ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
389{
390 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
391 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
392 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
393 x = ( x >> 8 ) | ( x << 8);
394
395 return x;
396}
397
398ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
399ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
400{
401 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
402 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
403 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
404 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
405 x = ( x >> 16 ) | ( x << 16);
406
407 return x;
408}
409
410/* popcount64 is only available on 64 bit cpus as gcc builtin */
411/* so for this version we are lazy */
412ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
413ecb_function_ int
414ecb_popcount64 (uint64_t x)
415{
416 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
417}
418
419ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
420ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
421ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
422ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
423ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
424ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
425ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
426ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
427
428ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
429ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
430ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
431ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
432ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
433ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
434ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
435ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
158 436
159#if ECB_GCC_VERSION(4,3) 437#if ECB_GCC_VERSION(4,3)
160 #define ecb_bswap32(x) __builtin_bswap32 (x)
161 #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) 438 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
439 #define ecb_bswap32(x) __builtin_bswap32 (x)
440 #define ecb_bswap64(x) __builtin_bswap64 (x)
162#else 441#else
442 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
443 ecb_function_ uint16_t
444 ecb_bswap16 (uint16_t x)
445 {
446 return ecb_rotl16 (x, 8);
447 }
448
163 ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; 449 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
164 ECB_HEADER_INLINE uint32_t 450 ecb_function_ uint32_t
165 ecb_bswap32 (uint32_t x) 451 ecb_bswap32 (uint32_t x)
166 { 452 {
167 return (x >> 24) 453 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
168 | ((x >> 8) & 0x0000ff00)
169 | ((x << 8) & 0x00ff0000)
170 | (x << 24);
171 } 454 }
172 455
173 ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const; 456 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
174 ECB_HEADER_INLINE uint32_t 457 ecb_function_ uint64_t
175 ecb_bswap16 (uint32_t x) 458 ecb_bswap64 (uint64_t x)
176 { 459 {
177 return ((x >> 8) & 0xff) 460 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
178 | ((x << 8) & 0x00ff0000)
179 | (x << 24);
180 } 461 }
181#endif 462#endif
182 463
183#if ECB_GCC_VERSION(4,5) 464#if ECB_GCC_VERSION(4,5)
184 #define ecb_unreachable() __builtin_unreachable () 465 #define ecb_unreachable() __builtin_unreachable ()
185#else 466#else
186 /* this seems to work fine, but gcc always emits a warning for it :/ */ 467 /* this seems to work fine, but gcc always emits a warning for it :/ */
187 ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; 468 ecb_inline void ecb_unreachable (void) ecb_noreturn;
188 ECB_HEADER_INLINE void ecb_unreachable (void) { } 469 ecb_inline void ecb_unreachable (void) { }
189#endif 470#endif
190 471
472/* try to tell the compiler that some condition is definitely true */
473#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
474
191ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; 475ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
192ECB_HEADER_INLINE unsigned char 476ecb_inline unsigned char
193ecb_byteorder_helper (void) 477ecb_byteorder_helper (void)
194{ 478{
195 const uint32_t u = 0x11223344; 479 /* the union code still generates code under pressure in gcc, */
196 return *(unsigned char *)&u; 480 /* but less than using pointers, and always seem to */
481 /* successfully return a constant. */
482 /* the reason why we have this horrible preprocessor mess */
483 /* is to avoid it in all cases, at least on common architectures */
484 /* and yes, gcc defines __BYTE_ORDER__, g++ does not */
485#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
486 return 0x44;
487#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
488 return 0x44;
489#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
490 retrurn 0x11;
491#else
492 union
493 {
494 uint32_t i;
495 uint8_t c;
496 } u = { 0x11223344 };
497 return u.c;
498#endif
197} 499}
198 500
199ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; 501ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
200ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; 502ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
201ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; 503ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
202ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; 504ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
203 505
204#if ECB_GCC_VERSION(3,0) 506#if ECB_GCC_VERSION(3,0) || ECB_C99
205 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 507 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
206#else 508#else
207 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 509 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
208#endif 510#endif
209 511
512#if __cplusplus
513 template<typename T>
514 static inline T ecb_div_rd (T val, T div)
515 {
516 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
517 }
518 template<typename T>
519 static inline T ecb_div_ru (T val, T div)
520 {
521 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
522 }
523#else
524 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
525 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
526#endif
527
210#if ecb_cplusplus_does_not_suck 528#if ecb_cplusplus_does_not_suck
211 // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) 529 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
212 template<typename T, int N> 530 template<typename T, int N>
213 static inline int ecb_array_length (const T (&arr)[N]) 531 static inline int ecb_array_length (const T (&arr)[N])
214 { 532 {
215 return N; 533 return N;
216 } 534 }
217#else 535#else
218 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 536 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
219#endif 537#endif
220 538
221ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; 539/*******************************************************************************/
222ECB_INLINE uint32_t 540/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
223ecb_rotr32 (uint32_t x, unsigned int count)
224{
225 return (x << (32 - count)) | (x >> count);
226}
227 541
228ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; 542/* basically, everything uses "ieee pure-endian" floating point numbers */
229ECB_INLINE uint32_t 543/* the only noteworthy exception is ancient armle, which uses order 43218765 */
230ecb_rotl32 (uint32_t x, unsigned int count) 544#if 0 \
231{ 545 || __i386 || __i386__ \
232 return (x >> (32 - count)) | (x << count); 546 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
233} 547 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
548 || defined __arm__ && defined __ARM_EABI__ \
549 || defined __s390__ || defined __s390x__ \
550 || defined __mips__ \
551 || defined __alpha__ \
552 || defined __hppa__ \
553 || defined __ia64__ \
554 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
555 #define ECB_STDFP 1
556 #include <string.h> /* for memcpy */
557#else
558 #define ECB_STDFP 0
559 #include <math.h> /* for frexp*, ldexp* */
560#endif
234 561
562#ifndef ECB_NO_LIBM
563
564 /* convert a float to ieee single/binary32 */
565 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
566 ecb_function_ uint32_t
567 ecb_float_to_binary32 (float x)
568 {
569 uint32_t r;
570
571 #if ECB_STDFP
572 memcpy (&r, &x, 4);
573 #else
574 /* slow emulation, works for anything but -0 */
575 uint32_t m;
576 int e;
577
578 if (x == 0e0f ) return 0x00000000U;
579 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
580 if (x < -3.40282346638528860e+38f) return 0xff800000U;
581 if (x != x ) return 0x7fbfffffU;
582
583 m = frexpf (x, &e) * 0x1000000U;
584
585 r = m & 0x80000000U;
586
587 if (r)
588 m = -m;
589
590 if (e <= -126)
591 {
592 m &= 0xffffffU;
593 m >>= (-125 - e);
594 e = -126;
595 }
596
597 r |= (e + 126) << 23;
598 r |= m & 0x7fffffU;
235#endif 599 #endif
236 600
601 return r;
602 }
603
604 /* converts an ieee single/binary32 to a float */
605 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
606 ecb_function_ float
607 ecb_binary32_to_float (uint32_t x)
608 {
609 float r;
610
611 #if ECB_STDFP
612 memcpy (&r, &x, 4);
613 #else
614 /* emulation, only works for normals and subnormals and +0 */
615 int neg = x >> 31;
616 int e = (x >> 23) & 0xffU;
617
618 x &= 0x7fffffU;
619
620 if (e)
621 x |= 0x800000U;
622 else
623 e = 1;
624
625 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
626 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
627
628 r = neg ? -r : r;
629 #endif
630
631 return r;
632 }
633
634 /* convert a double to ieee double/binary64 */
635 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
636 ecb_function_ uint64_t
637 ecb_double_to_binary64 (double x)
638 {
639 uint64_t r;
640
641 #if ECB_STDFP
642 memcpy (&r, &x, 8);
643 #else
644 /* slow emulation, works for anything but -0 */
645 uint64_t m;
646 int e;
647
648 if (x == 0e0 ) return 0x0000000000000000U;
649 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
650 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
651 if (x != x ) return 0X7ff7ffffffffffffU;
652
653 m = frexp (x, &e) * 0x20000000000000U;
654
655 r = m & 0x8000000000000000;;
656
657 if (r)
658 m = -m;
659
660 if (e <= -1022)
661 {
662 m &= 0x1fffffffffffffU;
663 m >>= (-1021 - e);
664 e = -1022;
665 }
666
667 r |= ((uint64_t)(e + 1022)) << 52;
668 r |= m & 0xfffffffffffffU;
669 #endif
670
671 return r;
672 }
673
674 /* converts an ieee double/binary64 to a double */
675 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
676 ecb_function_ double
677 ecb_binary64_to_double (uint64_t x)
678 {
679 double r;
680
681 #if ECB_STDFP
682 memcpy (&r, &x, 8);
683 #else
684 /* emulation, only works for normals and subnormals and +0 */
685 int neg = x >> 63;
686 int e = (x >> 52) & 0x7ffU;
687
688 x &= 0xfffffffffffffU;
689
690 if (e)
691 x |= 0x10000000000000U;
692 else
693 e = 1;
694
695 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
696 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
697
698 r = neg ? -r : r;
699 #endif
700
701 return r;
702 }
703
704#endif
705
706#endif
707

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