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Comparing libecb/ecb.h (file contents):
Revision 1.59 by sf-exg, Thu Aug 4 06:38:35 2011 UTC vs.
Revision 1.143 by root, Fri Oct 17 10:56:48 2014 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 (©) 2009-2014 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:
… …
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
26 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 26 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE. 27 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Alternatively, the contents of this file may be used under the terms of
30 * the GNU General Public License ("GPL") version 2 or any later version,
31 * in which case the provisions of the GPL are applicable instead of
32 * the above. If you wish to allow the use of your version of this file
33 * only under the terms of the GPL and not to allow others to use your
34 * version of this file under the BSD license, indicate your decision
35 * by deleting the provisions above and replace them with the notice
36 * and other provisions required by the GPL. If you do not delete the
37 * provisions above, a recipient may use your version of this file under
38 * either the BSD or the GPL.
28 */ 39 */
29 40
30#ifndef ECB_H 41#ifndef ECB_H
31#define ECB_H 42#define ECB_H
43
44/* 16 bits major, 16 bits minor */
45#define ECB_VERSION 0x00010004
32 46
33#ifdef _WIN32 47#ifdef _WIN32
34 typedef signed char int8_t; 48 typedef signed char int8_t;
35 typedef unsigned char uint8_t; 49 typedef unsigned char uint8_t;
36 typedef signed short int16_t; 50 typedef signed short int16_t;
… …
42 typedef unsigned long long uint64_t; 56 typedef unsigned long long uint64_t;
43 #else /* _MSC_VER || __BORLANDC__ */ 57 #else /* _MSC_VER || __BORLANDC__ */
44 typedef signed __int64 int64_t; 58 typedef signed __int64 int64_t;
45 typedef unsigned __int64 uint64_t; 59 typedef unsigned __int64 uint64_t;
46 #endif 60 #endif
61 #ifdef _WIN64
62 #define ECB_PTRSIZE 8
63 typedef uint64_t uintptr_t;
64 typedef int64_t intptr_t;
65 #else
66 #define ECB_PTRSIZE 4
67 typedef uint32_t uintptr_t;
68 typedef int32_t intptr_t;
69 #endif
47#else 70#else
48 #include <inttypes.h> 71 #include <inttypes.h>
72 #if UINTMAX_MAX > 0xffffffffU
73 #define ECB_PTRSIZE 8
74 #else
75 #define ECB_PTRSIZE 4
76 #endif
77#endif
78
79/* work around x32 idiocy by defining proper macros */
80#if __amd64 || __x86_64 || _M_AMD64 || _M_X64
81 #if _ILP32
82 #define ECB_AMD64_X32 1
83 #else
84 #define ECB_AMD64 1
85 #endif
49#endif 86#endif
50 87
51/* many compilers define _GNUC_ to some versions but then only implement 88/* many compilers define _GNUC_ to some versions but then only implement
52 * what their idiot authors think are the "more important" extensions, 89 * what their idiot authors think are the "more important" extensions,
53 * causing enormous grief in return for some better fake benchmark numbers. 90 * causing enormous grief in return for some better fake benchmark numbers.
54 * or so. 91 * or so.
55 * we try to detect these and simply assume they are not gcc - if they have 92 * we try to detect these and simply assume they are not gcc - if they have
56 * an issue with that they should have done it right in the first place. 93 * an issue with that they should have done it right in the first place.
57 */ 94 */
58#ifndef ECB_GCC_VERSION
59 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__) 95#if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
60 #define ECB_GCC_VERSION(major,minor) 0 96 #define ECB_GCC_VERSION(major,minor) 0
61 #else 97#else
62 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 98 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
63 #endif 99#endif
100
101#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
102
103#if __clang__ && defined(__has_builtin)
104 #define ECB_CLANG_BUILTIN(x) __has_builtin(x)
105#else
106 #define ECB_CLANG_BUILTIN(x) 0
107#endif
108
109#if __clang__ && defined(__has_extension)
110 #define ECB_CLANG_EXTENSION(x) __has_extension(x)
111#else
112 #define ECB_CLANG_EXTENSION(x) 0
113#endif
114
115#define ECB_CPP (__cplusplus+0)
116#define ECB_CPP11 (__cplusplus >= 201103L)
117
118#if ECB_CPP
119 #define ECB_C 0
120 #define ECB_STDC_VERSION 0
121#else
122 #define ECB_C 1
123 #define ECB_STDC_VERSION __STDC_VERSION__
124#endif
125
126#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
127#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
128
129#if ECB_CPP
130 #define ECB_EXTERN_C extern "C"
131 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
132 #define ECB_EXTERN_C_END }
133#else
134 #define ECB_EXTERN_C extern
135 #define ECB_EXTERN_C_BEG
136 #define ECB_EXTERN_C_END
64#endif 137#endif
65 138
66/*****************************************************************************/ 139/*****************************************************************************/
67 140
68/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ 141/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
69/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ 142/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
70 143
71#if ECB_NO_THREADS || ECB_NO_SMP 144#if ECB_NO_THREADS
145 #define ECB_NO_SMP 1
146#endif
147
148#if ECB_NO_SMP
72 #define ECB_MEMORY_FENCE do { } while (0) 149 #define ECB_MEMORY_FENCE do { } while (0)
73 #define ECB_MEMORY_FENCE_ACQUIRE do { } while (0)
74 #define ECB_MEMORY_FENCE_RELEASE do { } while (0)
75#endif 150#endif
76 151
77#ifndef ECB_MEMORY_FENCE 152#ifndef ECB_MEMORY_FENCE
78 #if ECB_GCC_VERSION(2,5) 153 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
79 #if __x86 154 #if __i386 || __i386__
80 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 155 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
81 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ 156 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
82 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ 157 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
83 #elif __amd64 158 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
84 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 159 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
85 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 160 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
86 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ 161 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
162 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
163 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
164 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
165 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
166 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
167 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
168 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
169 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
170 #elif __aarch64__
171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
172 #elif (__sparc || __sparc__) && !__sparcv8
173 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
174 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
175 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
176 #elif defined __s390__ || defined __s390x__
177 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
178 #elif defined __mips__
179 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
180 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
181 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
182 #elif defined __alpha__
183 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
184 #elif defined __hppa__
185 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
186 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
187 #elif defined __ia64__
188 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
189 #elif defined __m68k__
190 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
191 #elif defined __m88k__
192 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
193 #elif defined __sh__
194 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
87 #endif 195 #endif
88 #endif 196 #endif
89#endif 197#endif
90 198
91#ifndef ECB_MEMORY_FENCE 199#ifndef ECB_MEMORY_FENCE
92 #if ECB_GCC_VERSION(4,4) 200 #if ECB_GCC_VERSION(4,7)
201 /* see comment below (stdatomic.h) about the C11 memory model. */
202 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
203 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
204 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
205
206 #elif ECB_CLANG_EXTENSION(c_atomic)
207 /* see comment below (stdatomic.h) about the C11 memory model. */
208 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
209 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
210 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
211
212 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
93 #define ECB_MEMORY_FENCE __sync_synchronize () 213 #define ECB_MEMORY_FENCE __sync_synchronize ()
94 #define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) 214 #elif _MSC_VER >= 1500 /* VC++ 2008 */
95 #define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) 215 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
216 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
217 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
218 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
219 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
96 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 220 #elif _MSC_VER >= 1400 /* VC++ 2005 */
97 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 221 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
98 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 222 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
99 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ 223 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
100 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () 224 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
101 #elif defined(_WIN32) 225 #elif defined _WIN32
102 #include <WinNT.h> 226 #include <WinNT.h>
103 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ 227 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
104 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 228 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
105 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 229 #include <mbarrier.h>
230 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
231 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
232 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
233 #elif __xlC__
234 #define ECB_MEMORY_FENCE __sync ()
106 #endif 235 #endif
107#endif 236#endif
108 237
109#ifndef ECB_MEMORY_FENCE 238#ifndef ECB_MEMORY_FENCE
239 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
240 /* we assume that these memory fences work on all variables/all memory accesses, */
241 /* not just C11 atomics and atomic accesses */
242 #include <stdatomic.h>
243 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
244 /* any fence other than seq_cst, which isn't very efficient for us. */
245 /* Why that is, we don't know - either the C11 memory model is quite useless */
246 /* for most usages, or gcc and clang have a bug */
247 /* I *currently* lean towards the latter, and inefficiently implement */
248 /* all three of ecb's fences as a seq_cst fence */
249 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
250 /* for all __atomic_thread_fence's except seq_cst */
251 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
252 #endif
253#endif
254
255#ifndef ECB_MEMORY_FENCE
256 #if !ECB_AVOID_PTHREADS
110 /* 257 /*
111 * if you get undefined symbol references to pthread_mutex_lock, 258 * if you get undefined symbol references to pthread_mutex_lock,
112 * or failure to find pthread.h, then you should implement 259 * or failure to find pthread.h, then you should implement
113 * the ECB_MEMORY_FENCE operations for your cpu/compiler 260 * the ECB_MEMORY_FENCE operations for your cpu/compiler
114 * OR provide pthread.h and link against the posix thread library 261 * OR provide pthread.h and link against the posix thread library
115 * of your system. 262 * of your system.
116 */ 263 */
117 #include <pthread.h> 264 #include <pthread.h>
265 #define ECB_NEEDS_PTHREADS 1
266 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
118 267
119 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; 268 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
120 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) 269 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
270 #endif
271#endif
272
273#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
121 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 274 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
275#endif
276
277#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
122 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 278 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
123#endif 279#endif
124 280
125/*****************************************************************************/ 281/*****************************************************************************/
126
127#define ECB_C99 (__STDC_VERSION__ >= 199901L)
128 282
129#if __cplusplus 283#if __cplusplus
130 #define ecb_inline static inline 284 #define ecb_inline static inline
131#elif ECB_GCC_VERSION(2,5) 285#elif ECB_GCC_VERSION(2,5)
132 #define ecb_inline static __inline__ 286 #define ecb_inline static __inline__
… …
151#define ECB_STRINGIFY_(a) # a 305#define ECB_STRINGIFY_(a) # a
152#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 306#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
153 307
154#define ecb_function_ ecb_inline 308#define ecb_function_ ecb_inline
155 309
156#if ECB_GCC_VERSION(3,1) 310#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
157 #define ecb_attribute(attrlist) __attribute__(attrlist) 311 #define ecb_attribute(attrlist) __attribute__ (attrlist)
312#else
313 #define ecb_attribute(attrlist)
314#endif
315
316#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
158 #define ecb_is_constant(expr) __builtin_constant_p (expr) 317 #define ecb_is_constant(expr) __builtin_constant_p (expr)
318#else
319 /* possible C11 impl for integral types
320 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
321 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
322
323 #define ecb_is_constant(expr) 0
324#endif
325
326#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
159 #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 327 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
328#else
329 #define ecb_expect(expr,value) (expr)
330#endif
331
332#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
160 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 333 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
161#else 334#else
162 #define ecb_attribute(attrlist)
163 #define ecb_is_constant(expr) 0
164 #define ecb_expect(expr,value) (expr)
165 #define ecb_prefetch(addr,rw,locality) 335 #define ecb_prefetch(addr,rw,locality)
166#endif 336#endif
167 337
168/* no emulation for ecb_decltype */ 338/* no emulation for ecb_decltype */
169#if ECB_GCC_VERSION(4,5) 339#if ECB_CPP11
170 #define ecb_decltype(x) __decltype(x) 340 #define ecb_decltype(x) decltype (x)
171#elif ECB_GCC_VERSION(3,0) 341#elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
172 #define ecb_decltype(x) __typeof(x) 342 #define ecb_decltype(x) __typeof__ (x)
343#endif
344
345#if _MSC_VER >= 1300
346 #define ecb_deprecated __declspec(deprecated)
347#else
348 #define ecb_deprecated ecb_attribute ((__deprecated__))
173#endif 349#endif
174 350
175#define ecb_noinline ecb_attribute ((__noinline__)) 351#define ecb_noinline ecb_attribute ((__noinline__))
176#define ecb_noreturn ecb_attribute ((__noreturn__))
177#define ecb_unused ecb_attribute ((__unused__)) 352#define ecb_unused ecb_attribute ((__unused__))
178#define ecb_const ecb_attribute ((__const__)) 353#define ecb_const ecb_attribute ((__const__))
179#define ecb_pure ecb_attribute ((__pure__)) 354#define ecb_pure ecb_attribute ((__pure__))
355
356/* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx __declspec(noreturn) */
357#if ECB_C11
358 #define ecb_noreturn _Noreturn
359#else
360 #define ecb_noreturn ecb_attribute ((__noreturn__))
361#endif
180 362
181#if ECB_GCC_VERSION(4,3) 363#if ECB_GCC_VERSION(4,3)
182 #define ecb_artificial ecb_attribute ((__artificial__)) 364 #define ecb_artificial ecb_attribute ((__artificial__))
183 #define ecb_hot ecb_attribute ((__hot__)) 365 #define ecb_hot ecb_attribute ((__hot__))
184 #define ecb_cold ecb_attribute ((__cold__)) 366 #define ecb_cold ecb_attribute ((__cold__))
… …
196/* for compatibility to the rest of the world */ 378/* for compatibility to the rest of the world */
197#define ecb_likely(expr) ecb_expect_true (expr) 379#define ecb_likely(expr) ecb_expect_true (expr)
198#define ecb_unlikely(expr) ecb_expect_false (expr) 380#define ecb_unlikely(expr) ecb_expect_false (expr)
199 381
200/* count trailing zero bits and count # of one bits */ 382/* count trailing zero bits and count # of one bits */
201#if ECB_GCC_VERSION(3,4) 383#if ECB_GCC_VERSION(3,4) \
384 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
385 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
386 && ECB_CLANG_BUILTIN(__builtin_popcount))
202 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ 387 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
203 #define ecb_ld32(x) (__builtin_clz (x) ^ 31) 388 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
204 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63) 389 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
205 #define ecb_ctz32(x) __builtin_ctz (x) 390 #define ecb_ctz32(x) __builtin_ctz (x)
206 #define ecb_ctz64(x) __builtin_ctzll (x) 391 #define ecb_ctz64(x) __builtin_ctzll (x)
… …
274 if (x >> 32) { x >>= 32; r += 32; } 459 if (x >> 32) { x >>= 32; r += 32; }
275 460
276 return r + ecb_ld32 (x); 461 return r + ecb_ld32 (x);
277 } 462 }
278#endif 463#endif
464
465ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
466ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
467ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
468ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
469
470ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
471ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
472{
473 return ( (x * 0x0802U & 0x22110U)
474 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
475}
476
477ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
478ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
479{
480 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
481 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
482 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
483 x = ( x >> 8 ) | ( x << 8);
484
485 return x;
486}
487
488ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
489ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
490{
491 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
492 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
493 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
494 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
495 x = ( x >> 16 ) | ( x << 16);
496
497 return x;
498}
279 499
280/* popcount64 is only available on 64 bit cpus as gcc builtin */ 500/* popcount64 is only available on 64 bit cpus as gcc builtin */
281/* so for this version we are lazy */ 501/* so for this version we are lazy */
282ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; 502ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
283ecb_function_ int 503ecb_function_ int
… …
302ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } 522ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
303ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } 523ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
304ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } 524ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
305ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } 525ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
306 526
307#if ECB_GCC_VERSION(4,3) 527#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
308 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) 528 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
309 #define ecb_bswap32(x) __builtin_bswap32 (x) 529 #define ecb_bswap32(x) __builtin_bswap32 (x)
310 #define ecb_bswap64(x) __builtin_bswap64 (x) 530 #define ecb_bswap64(x) __builtin_bswap64 (x)
311#else 531#else
312 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; 532 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
… …
329 { 549 {
330 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); 550 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
331 } 551 }
332#endif 552#endif
333 553
334#if ECB_GCC_VERSION(4,5) 554#if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
335 #define ecb_unreachable() __builtin_unreachable () 555 #define ecb_unreachable() __builtin_unreachable ()
336#else 556#else
337 /* this seems to work fine, but gcc always emits a warning for it :/ */ 557 /* this seems to work fine, but gcc always emits a warning for it :/ */
338 ecb_function_ void ecb_unreachable (void) ecb_noreturn; 558 ecb_inline void ecb_unreachable (void) ecb_noreturn;
339 ecb_function_ void ecb_unreachable (void) { } 559 ecb_inline void ecb_unreachable (void) { }
340#endif 560#endif
341 561
342/* try to tell the compiler that some condition is definitely true */ 562/* try to tell the compiler that some condition is definitely true */
343#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 563#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
344 564
345ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; 565ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
346ecb_function_ unsigned char 566ecb_inline unsigned char
347ecb_byteorder_helper (void) 567ecb_byteorder_helper (void)
348{ 568{
349 const uint32_t u = 0x11223344; 569 /* the union code still generates code under pressure in gcc, */
350 return *(unsigned char *)&u; 570 /* but less than using pointers, and always seems to */
571 /* successfully return a constant. */
572 /* the reason why we have this horrible preprocessor mess */
573 /* is to avoid it in all cases, at least on common architectures */
574 /* or when using a recent enough gcc version (>= 4.6) */
575#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
576 return 0x44;
577#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
578 return 0x44;
579#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
580 return 0x11;
581#else
582 union
583 {
584 uint32_t i;
585 uint8_t c;
586 } u = { 0x11223344 };
587 return u.c;
588#endif
351} 589}
352 590
353ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; 591ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
354ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } 592ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
355ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; 593ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
356ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } 594ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
357 595
358#if ECB_GCC_VERSION(3,0) || ECB_C99 596#if ECB_GCC_VERSION(3,0) || ECB_C99
359 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 597 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
360#else 598#else
361 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 599 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
600#endif
601
602#if __cplusplus
603 template<typename T>
604 static inline T ecb_div_rd (T val, T div)
605 {
606 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
607 }
608 template<typename T>
609 static inline T ecb_div_ru (T val, T div)
610 {
611 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
612 }
613#else
614 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
615 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
362#endif 616#endif
363 617
364#if ecb_cplusplus_does_not_suck 618#if ecb_cplusplus_does_not_suck
365 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ 619 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
366 template<typename T, int N> 620 template<typename T, int N>
… …
370 } 624 }
371#else 625#else
372 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 626 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
373#endif 627#endif
374 628
629/*******************************************************************************/
630/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
631
632/* basically, everything uses "ieee pure-endian" floating point numbers */
633/* the only noteworthy exception is ancient armle, which uses order 43218765 */
634#if 0 \
635 || __i386 || __i386__ \
636 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
637 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
638 || defined __s390__ || defined __s390x__ \
639 || defined __mips__ \
640 || defined __alpha__ \
641 || defined __hppa__ \
642 || defined __ia64__ \
643 || defined __m68k__ \
644 || defined __m88k__ \
645 || defined __sh__ \
646 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \
647 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
648 || defined __aarch64__
649 #define ECB_STDFP 1
650 #include <string.h> /* for memcpy */
651#else
652 #define ECB_STDFP 0
653#endif
654
655#ifndef ECB_NO_LIBM
656
657 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
658
659 /* only the oldest of old doesn't have this one. solaris. */
660 #ifdef INFINITY
661 #define ECB_INFINITY INFINITY
662 #else
663 #define ECB_INFINITY HUGE_VAL
375#endif 664 #endif
376 665
666 #ifdef NAN
667 #define ECB_NAN NAN
668 #else
669 #define ECB_NAN ECB_INFINITY
670 #endif
671
672 /* converts an ieee half/binary16 to a float */
673 ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
674 ecb_function_ float
675 ecb_binary16_to_float (uint16_t x)
676 {
677 int e = (x >> 10) & 0x1f;
678 int m = x & 0x3ff;
679 float r;
680
681 if (!e ) r = ldexpf (m , -24);
682 else if (e != 31) r = ldexpf (m + 0x400, e - 25);
683 else if (m ) r = ECB_NAN;
684 else r = ECB_INFINITY;
685
686 return x & 0x8000 ? -r : r;
687 }
688
689 /* convert a float to ieee single/binary32 */
690 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
691 ecb_function_ uint32_t
692 ecb_float_to_binary32 (float x)
693 {
694 uint32_t r;
695
696 #if ECB_STDFP
697 memcpy (&r, &x, 4);
698 #else
699 /* slow emulation, works for anything but -0 */
700 uint32_t m;
701 int e;
702
703 if (x == 0e0f ) return 0x00000000U;
704 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
705 if (x < -3.40282346638528860e+38f) return 0xff800000U;
706 if (x != x ) return 0x7fbfffffU;
707
708 m = frexpf (x, &e) * 0x1000000U;
709
710 r = m & 0x80000000U;
711
712 if (r)
713 m = -m;
714
715 if (e <= -126)
716 {
717 m &= 0xffffffU;
718 m >>= (-125 - e);
719 e = -126;
720 }
721
722 r |= (e + 126) << 23;
723 r |= m & 0x7fffffU;
724 #endif
725
726 return r;
727 }
728
729 /* converts an ieee single/binary32 to a float */
730 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
731 ecb_function_ float
732 ecb_binary32_to_float (uint32_t x)
733 {
734 float r;
735
736 #if ECB_STDFP
737 memcpy (&r, &x, 4);
738 #else
739 /* emulation, only works for normals and subnormals and +0 */
740 int neg = x >> 31;
741 int e = (x >> 23) & 0xffU;
742
743 x &= 0x7fffffU;
744
745 if (e)
746 x |= 0x800000U;
747 else
748 e = 1;
749
750 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
751 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
752
753 r = neg ? -r : r;
754 #endif
755
756 return r;
757 }
758
759 /* convert a double to ieee double/binary64 */
760 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
761 ecb_function_ uint64_t
762 ecb_double_to_binary64 (double x)
763 {
764 uint64_t r;
765
766 #if ECB_STDFP
767 memcpy (&r, &x, 8);
768 #else
769 /* slow emulation, works for anything but -0 */
770 uint64_t m;
771 int e;
772
773 if (x == 0e0 ) return 0x0000000000000000U;
774 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
775 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
776 if (x != x ) return 0X7ff7ffffffffffffU;
777
778 m = frexp (x, &e) * 0x20000000000000U;
779
780 r = m & 0x8000000000000000;;
781
782 if (r)
783 m = -m;
784
785 if (e <= -1022)
786 {
787 m &= 0x1fffffffffffffU;
788 m >>= (-1021 - e);
789 e = -1022;
790 }
791
792 r |= ((uint64_t)(e + 1022)) << 52;
793 r |= m & 0xfffffffffffffU;
794 #endif
795
796 return r;
797 }
798
799 /* converts an ieee double/binary64 to a double */
800 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
801 ecb_function_ double
802 ecb_binary64_to_double (uint64_t x)
803 {
804 double r;
805
806 #if ECB_STDFP
807 memcpy (&r, &x, 8);
808 #else
809 /* emulation, only works for normals and subnormals and +0 */
810 int neg = x >> 63;
811 int e = (x >> 52) & 0x7ffU;
812
813 x &= 0xfffffffffffffU;
814
815 if (e)
816 x |= 0x10000000000000U;
817 else
818 e = 1;
819
820 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
821 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
822
823 r = neg ? -r : r;
824 #endif
825
826 return r;
827 }
828
829#endif
830
831#endif
832

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