[ViewVC] Diff of: cvs/libecb/ecb.h

Comparing libecb/ecb.h (file contents):
Revision 1.92 by root, Tue May 29 17:17:56 2012 UTC vs.
Revision 1.171 by root, Tue Nov 24 19:46:20 2015 UTC

…		…
1	/*	1	/*
2	* libecb - http://software.schmorp.de/pkg/libecb	2	* libecb - http://software.schmorp.de/pkg/libecb
3	*	3	*
4	* Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>	4	* Copyright (©) 2009-2015 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
32		43
33	/* 16 bits major, 16 bits minor */	44	/* 16 bits major, 16 bits minor */
34	#define ECB_VERSION 0x00010001	45	#define ECB_VERSION 0x00010005
35		46
36	#ifdef _WIN32	47	#ifdef _WIN32
37	typedef signed char int8_t;	48	typedef signed char int8_t;
38	typedef unsigned char uint8_t;	49	typedef unsigned char uint8_t;
39	typedef signed short int16_t;	50	typedef signed short int16_t;
…		…
54	#else	65	#else
55	#define ECB_PTRSIZE 4	66	#define ECB_PTRSIZE 4
56	typedef uint32_t uintptr_t;	67	typedef uint32_t uintptr_t;
57	typedef int32_t intptr_t;	68	typedef int32_t intptr_t;
58	#endif	69	#endif
59	typedef intptr_t ptrdiff_t;
60	#else	70	#else
61	#include <inttypes.h>	71	#include <inttypes.h>
62	#if UINTMAX_MAX > 0xffffffffU	72	#if UINTMAX_MAX > 0xffffffffU
63	#define ECB_PTRSIZE 8	73	#define ECB_PTRSIZE 8
64	#else	74	#else
65	#define ECB_PTRSIZE 4	75	#define ECB_PTRSIZE 4
		76	#endif
		77	#endif
		78
		79	#define ECB_GCC_AMD64 (__amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__)
		80	#define ECB_MSVC_AMD64 (_M_AMD64 \|\| _M_X64)
		81
		82	/* work around x32 idiocy by defining proper macros */
		83	#if ECB_GCC_AMD64 \|\| ECB_MSVC_AMD64
		84	#if _ILP32
		85	#define ECB_AMD64_X32 1
		86	#else
		87	#define ECB_AMD64 1
66	#endif	88	#endif
67	#endif	89	#endif
68		90
69	/* many compilers define _GNUC_ to some versions but then only implement	91	/* many compilers define _GNUC_ to some versions but then only implement
70	* what their idiot authors think are the "more important" extensions,	92	* what their idiot authors think are the "more important" extensions,
71	* causing enormous grief in return for some better fake benchmark numbers.	93	* causing enormous grief in return for some better fake benchmark numbers.
72	* or so.	94	* or so.
73	* we try to detect these and simply assume they are not gcc - if they have	95	* we try to detect these and simply assume they are not gcc - if they have
74	* an issue with that they should have done it right in the first place.	96	* an issue with that they should have done it right in the first place.
75	*/	97	*/
76	#ifndef ECB_GCC_VERSION
77	#if !defined __GNUC_MINOR__ \|\| defined __INTEL_COMPILER \|\| defined __SUNPRO_C \|\| defined __SUNPRO_CC \|\| defined __llvm__ \|\| defined __clang__	98	#if !defined __GNUC_MINOR__ \|\| defined __INTEL_COMPILER \|\| defined __SUNPRO_C \|\| defined __SUNPRO_CC \|\| defined __llvm__ \|\| defined __clang__
78	#define ECB_GCC_VERSION(major,minor) 0	99	#define ECB_GCC_VERSION(major,minor) 0
79	#else	100	#else
80	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))	101	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
81	#endif	102	#endif
82	#endif
83		103
84	#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */	104	#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) \|\| (__clang_major__ == (major) && __clang_minor__ >= (minor)))
85	#define ECB_C99 (__STDC_VERSION__ >= 199901L)	105
86	#define ECB_C11 (__STDC_VERSION__ >= 201112L)	106	#if __clang__ && defined __has_builtin
		107	#define ECB_CLANG_BUILTIN(x) __has_builtin (x)
		108	#else
		109	#define ECB_CLANG_BUILTIN(x) 0
		110	#endif
		111
		112	#if __clang__ && defined __has_extension
		113	#define ECB_CLANG_EXTENSION(x) __has_extension (x)
		114	#else
		115	#define ECB_CLANG_EXTENSION(x) 0
		116	#endif
		117
87	#define ECB_CPP (__cplusplus+0)	118	#define ECB_CPP (__cplusplus+0)
88	#define ECB_CPP98 (__cplusplus >= 199711L)
89	#define ECB_CPP11 (__cplusplus >= 201103L)	119	#define ECB_CPP11 (__cplusplus >= 201103L)
		120
		121	#if ECB_CPP
		122	#define ECB_C 0
		123	#define ECB_STDC_VERSION 0
		124	#else
		125	#define ECB_C 1
		126	#define ECB_STDC_VERSION __STDC_VERSION__
		127	#endif
		128
		129	#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
		130	#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
		131
		132	#if ECB_CPP
		133	#define ECB_EXTERN_C extern "C"
		134	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {
		135	#define ECB_EXTERN_C_END }
		136	#else
		137	#define ECB_EXTERN_C extern
		138	#define ECB_EXTERN_C_BEG
		139	#define ECB_EXTERN_C_END
		140	#endif
90		141
91	/*****************************************************************************/	142	/*****************************************************************************/
92		143
93	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */	144	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
94	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */	145	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
95		146
96	#if ECB_NO_THREADS	147	#if ECB_NO_THREADS
97	# define ECB_NO_SMP 1	148	#define ECB_NO_SMP 1
98	#endif	149	#endif
99		150
100	#if ECB_NO_THREADS \|\| ECB_NO_SMP	151	#if ECB_NO_SMP
101	#define ECB_MEMORY_FENCE do { } while (0)	152	#define ECB_MEMORY_FENCE do { } while (0)
102	#endif	153	#endif
103		154
104	#ifndef ECB_MEMORY_FENCE	155	/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
105	#if ECB_C11 && !defined __STDC_NO_ATOMICS__	156	#if __xlC__ && ECB_CPP
106	/* we assume that these memory fences work on all variables/all memory accesses, */	157	#include <builtins.h>
107	/* not just C11 atomics and atomic accesses */
108	#include <stdatomic.h>
109	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_acq_rel)
110	#define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
111	#define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
112	#endif	158	#endif
113	#endif
114		159
115	#ifndef ECB_MEMORY_FENCE_RELEASE	160	#if 1400 <= _MSC_VER
116	#if ECB_GCC_VERSION(4,7)	161	#include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
117	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_ACQ_REL)
118	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
119	#define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
120	#endif
121	#endif	162	#endif
122		163
123	#ifndef ECB_MEMORY_FENCE	164	#ifndef ECB_MEMORY_FENCE
124	#if ECB_GCC_VERSION(2,5) \|\| defined __INTEL_COMPILER \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110	165	#if ECB_GCC_VERSION(2,5) \|\| defined __INTEL_COMPILER \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
125	#if __i386 \|\| __i386__	166	#if __i386 \|\| __i386__
126	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")	167	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
127	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */	168	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
128	#define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */	169	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
129	#elif __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__	170	#elif ECB_GCC_AMD64
130	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")	171	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
131	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")	172	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
132	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */	173	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
133	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__	174	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__
134	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")	175	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
135	#elif defined __ARM_ARCH_6__ \|\| defined __ARM_ARCH_6J__ \	176	#elif defined __ARM_ARCH_6__ \|\| defined __ARM_ARCH_6J__ \
136	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__	177	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__
137	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")	178	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
138	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \	179	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \
139	\|\| defined __ARM_ARCH_7M__ \|\| defined __ARM_ARCH_7R__	180	\|\| defined __ARM_ARCH_7M__ \|\| defined __ARM_ARCH_7R__
140	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")	181	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
141	#elif __sparc \|\| __sparc__	182	#elif __aarch64__
		183	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
		184	#elif (__sparc \|\| __sparc__) && !(__sparc_v8__ \|\| defined __sparcv8)
142	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad \| " : : : "memory")	185	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad" : : : "memory")
143	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")	186	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
144	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")	187	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
145	#elif defined __s390__ \|\| defined __s390x__	188	#elif defined __s390__ \|\| defined __s390x__
146	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")	189	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
147	#elif defined __mips__	190	#elif defined __mips__
		191	/* GNU/Linux emulates sync on mips1 architectures, so we force its use */
		192	/* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
148	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")	193	#define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
149	#elif defined __alpha__	194	#elif defined __alpha__
150	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")	195	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
		196	#elif defined __hppa__
		197	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		198	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		199	#elif defined __ia64__
		200	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
		201	#elif defined __m68k__
		202	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		203	#elif defined __m88k__
		204	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
		205	#elif defined __sh__
		206	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
151	#endif	207	#endif
152	#endif	208	#endif
153	#endif	209	#endif
154		210
155	#ifndef ECB_MEMORY_FENCE	211	#ifndef ECB_MEMORY_FENCE
		212	#if ECB_GCC_VERSION(4,7)
		213	/* see comment below (stdatomic.h) about the C11 memory model. */
		214	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
		215	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
		216	#define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
		217
		218	#elif ECB_CLANG_EXTENSION(c_atomic)
		219	/* see comment below (stdatomic.h) about the C11 memory model. */
		220	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
		221	#define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
		222	#define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
		223
156	#if ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__	224	#elif ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__
157	#define ECB_MEMORY_FENCE __sync_synchronize ()	225	#define ECB_MEMORY_FENCE __sync_synchronize ()
158	/#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) /	226	#elif _MSC_VER >= 1500 /* VC++ 2008 */
159	/#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) /	227	/* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
		228	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		229	#define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
		230	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
		231	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
160	#elif _MSC_VER >= 1400 /* VC++ 2005 */	232	#elif _MSC_VER >= 1400 /* VC++ 2005 */
161	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)	233	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
162	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()	234	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
163	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */	235	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
164	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()	236	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
…		…
174	#define ECB_MEMORY_FENCE __sync ()	246	#define ECB_MEMORY_FENCE __sync ()
175	#endif	247	#endif
176	#endif	248	#endif
177		249
178	#ifndef ECB_MEMORY_FENCE	250	#ifndef ECB_MEMORY_FENCE
		251	#if ECB_C11 && !defined __STDC_NO_ATOMICS__
		252	/* we assume that these memory fences work on all variables/all memory accesses, */
		253	/* not just C11 atomics and atomic accesses */
		254	#include <stdatomic.h>
		255	/* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
		256	/* any fence other than seq_cst, which isn't very efficient for us. */
		257	/* Why that is, we don't know - either the C11 memory model is quite useless */
		258	/* for most usages, or gcc and clang have a bug */
		259	/* I currently lean towards the latter, and inefficiently implement */
		260	/* all three of ecb's fences as a seq_cst fence */
		261	/* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
		262	/* for all __atomic_thread_fence's except seq_cst */
		263	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
		264	#endif
		265	#endif
		266
		267	#ifndef ECB_MEMORY_FENCE
179	#if !ECB_AVOID_PTHREADS	268	#if !ECB_AVOID_PTHREADS
180	/*	269	/*
181	* if you get undefined symbol references to pthread_mutex_lock,	270	* if you get undefined symbol references to pthread_mutex_lock,
182	* or failure to find pthread.h, then you should implement	271	* or failure to find pthread.h, then you should implement
183	* the ECB_MEMORY_FENCE operations for your cpu/compiler	272	* the ECB_MEMORY_FENCE operations for your cpu/compiler
…		…
201	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE	290	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
202	#endif	291	#endif
203		292
204	/*****************************************************************************/	293	/*****************************************************************************/
205		294
206	#if __cplusplus	295	#if ECB_CPP
207	#define ecb_inline static inline	296	#define ecb_inline static inline
208	#elif ECB_GCC_VERSION(2,5)	297	#elif ECB_GCC_VERSION(2,5)
209	#define ecb_inline static __inline__	298	#define ecb_inline static __inline__
210	#elif ECB_C99	299	#elif ECB_C99
211	#define ecb_inline static inline	300	#define ecb_inline static inline
…		…
225		314
226	#define ECB_CONCAT_(a, b) a ## b	315	#define ECB_CONCAT_(a, b) a ## b
227	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	316	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
228	#define ECB_STRINGIFY_(a) # a	317	#define ECB_STRINGIFY_(a) # a
229	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)	318	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
		319	#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
230		320
231	#define ecb_function_ ecb_inline	321	#define ecb_function_ ecb_inline
232		322
233	#if ECB_GCC_VERSION(3,1)	323	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_VERSION(2,8)
234	#define ecb_attribute(attrlist) __attribute__(attrlist)	324	#define ecb_attribute(attrlist) __attribute__ (attrlist)
		325	#else
		326	#define ecb_attribute(attrlist)
		327	#endif
		328
		329	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_constant_p)
235	#define ecb_is_constant(expr) __builtin_constant_p (expr)	330	#define ecb_is_constant(expr) __builtin_constant_p (expr)
		331	#else
		332	/* possible C11 impl for integral types
		333	typedef struct ecb_is_constant_struct ecb_is_constant_struct;
		334	#define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct )0 : (void )((expr) - (expr)), ecb_is_constant_struct : 0, default: 1)) /
		335
		336	#define ecb_is_constant(expr) 0
		337	#endif
		338
		339	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_expect)
236	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))	340	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
		341	#else
		342	#define ecb_expect(expr,value) (expr)
		343	#endif
		344
		345	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_prefetch)
237	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)	346	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
238	#else	347	#else
239	#define ecb_attribute(attrlist)
240	#define ecb_is_constant(expr) 0
241	#define ecb_expect(expr,value) (expr)
242	#define ecb_prefetch(addr,rw,locality)	348	#define ecb_prefetch(addr,rw,locality)
243	#endif	349	#endif
244		350
245	/* no emulation for ecb_decltype */	351	/* no emulation for ecb_decltype */
246	#if ECB_GCC_VERSION(4,5)	352	#if ECB_CPP11
		353	// older implementations might have problems with decltype(x)::type, work around it
		354	template<class T> struct ecb_decltype_t { typedef T type; };
247	#define ecb_decltype(x) __decltype(x)	355	#define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
248	#elif ECB_GCC_VERSION(3,0)	356	#elif ECB_GCC_VERSION(3,0) \|\| ECB_CLANG_VERSION(2,8)
249	#define ecb_decltype(x) __typeof(x)	357	#define ecb_decltype(x) __typeof__ (x)
250	#endif	358	#endif
251		359
		360	#if _MSC_VER >= 1300
		361	#define ecb_deprecated __declspec (deprecated)
		362	#else
		363	#define ecb_deprecated ecb_attribute ((__deprecated__))
		364	#endif
		365
		366	#if _MSC_VER >= 1500
		367	#define ecb_deprecated_message(msg) __declspec (deprecated (msg))
		368	#elif ECB_GCC_VERSION(4,5)
		369	#define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
		370	#else
		371	#define ecb_deprecated_message(msg) ecb_deprecated
		372	#endif
		373
		374	#if _MSC_VER >= 1400
		375	#define ecb_noinline __declspec (noinline)
		376	#else
252	#define ecb_noinline ecb_attribute ((__noinline__))	377	#define ecb_noinline ecb_attribute ((__noinline__))
		378	#endif
		379
253	#define ecb_unused ecb_attribute ((__unused__))	380	#define ecb_unused ecb_attribute ((__unused__))
254	#define ecb_const ecb_attribute ((__const__))	381	#define ecb_const ecb_attribute ((__const__))
255	#define ecb_pure ecb_attribute ((__pure__))	382	#define ecb_pure ecb_attribute ((__pure__))
256		383
257	#if ECB_C11	384	#if ECB_C11 \|\| __IBMC_NORETURN
		385	/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
258	#define ecb_noreturn _Noreturn	386	#define ecb_noreturn _Noreturn
		387	#elif ECB_CPP11
		388	#define ecb_noreturn [[noreturn]]
		389	#elif _MSC_VER >= 1200
		390	/* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
		391	#define ecb_noreturn __declspec (noreturn)
259	#else	392	#else
260	#define ecb_noreturn ecb_attribute ((__noreturn__))	393	#define ecb_noreturn ecb_attribute ((__noreturn__))
261	#endif	394	#endif
262		395
263	#if ECB_GCC_VERSION(4,3)	396	#if ECB_GCC_VERSION(4,3)
…		…
278	/* for compatibility to the rest of the world */	411	/* for compatibility to the rest of the world */
279	#define ecb_likely(expr) ecb_expect_true (expr)	412	#define ecb_likely(expr) ecb_expect_true (expr)
280	#define ecb_unlikely(expr) ecb_expect_false (expr)	413	#define ecb_unlikely(expr) ecb_expect_false (expr)
281		414
282	/* count trailing zero bits and count # of one bits */	415	/* count trailing zero bits and count # of one bits */
283	#if ECB_GCC_VERSION(3,4)	416	#if ECB_GCC_VERSION(3,4) \
		417	\|\| (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
		418	&& ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
		419	&& ECB_CLANG_BUILTIN(__builtin_popcount))
284	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */	420	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
285	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)	421	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
286	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)	422	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
287	#define ecb_ctz32(x) __builtin_ctz (x)	423	#define ecb_ctz32(x) __builtin_ctz (x)
288	#define ecb_ctz64(x) __builtin_ctzll (x)	424	#define ecb_ctz64(x) __builtin_ctzll (x)
289	#define ecb_popcount32(x) __builtin_popcount (x)	425	#define ecb_popcount32(x) __builtin_popcount (x)
290	/* no popcountll */	426	/* no popcountll */
291	#else	427	#else
292	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;	428	ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
293	ecb_function_ int	429	ecb_function_ ecb_const int
294	ecb_ctz32 (uint32_t x)	430	ecb_ctz32 (uint32_t x)
295	{	431	{
		432	#if 1400 <= _MSC_VER && (_M_IX86 \|\| _M_X64 \|\| _M_IA64 \|\| _M_ARM)
		433	unsigned long r = 0;
		434	_BitScanForward (&r, x);
		435	return (int)r;
		436	#else
296	int r = 0;	437	int r = 0;
297		438
298	x &= ~x + 1; /* this isolates the lowest bit */	439	x &= ~x + 1; /* this isolates the lowest bit */
299		440
300	#if ECB_branchless_on_i386	441	#if ECB_branchless_on_i386
…		…
310	if (x & 0xff00ff00) r += 8;	451	if (x & 0xff00ff00) r += 8;
311	if (x & 0xffff0000) r += 16;	452	if (x & 0xffff0000) r += 16;
312	#endif	453	#endif
313		454
314	return r;	455	return r;
		456	#endif
315	}	457	}
316		458
317	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;	459	ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
318	ecb_function_ int	460	ecb_function_ ecb_const int
319	ecb_ctz64 (uint64_t x)	461	ecb_ctz64 (uint64_t x)
320	{	462	{
		463	#if 1400 <= _MSC_VER && (_M_X64 \|\| _M_IA64 \|\| _M_ARM)
		464	unsigned long r = 0;
		465	_BitScanForward64 (&r, x);
		466	return (int)r;
		467	#else
321	int shift = x & 0xffffffffU ? 0 : 32;	468	int shift = x & 0xffffffff ? 0 : 32;
322	return ecb_ctz32 (x >> shift) + shift;	469	return ecb_ctz32 (x >> shift) + shift;
		470	#endif
323	}	471	}
324		472
325	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;	473	ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
326	ecb_function_ int	474	ecb_function_ ecb_const int
327	ecb_popcount32 (uint32_t x)	475	ecb_popcount32 (uint32_t x)
328	{	476	{
329	x -= (x >> 1) & 0x55555555;	477	x -= (x >> 1) & 0x55555555;
330	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);	478	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
331	x = ((x >> 4) + x) & 0x0f0f0f0f;	479	x = ((x >> 4) + x) & 0x0f0f0f0f;
332	x *= 0x01010101;	480	x *= 0x01010101;
333		481
334	return x >> 24;	482	return x >> 24;
335	}	483	}
336		484
337	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;	485	ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
338	ecb_function_ int ecb_ld32 (uint32_t x)	486	ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
339	{	487	{
		488	#if 1400 <= _MSC_VER && (_M_IX86 \|\| _M_X64 \|\| _M_IA64 \|\| _M_ARM)
		489	unsigned long r = 0;
		490	_BitScanReverse (&r, x);
		491	return (int)r;
		492	#else
340	int r = 0;	493	int r = 0;
341		494
342	if (x >> 16) { x >>= 16; r += 16; }	495	if (x >> 16) { x >>= 16; r += 16; }
343	if (x >> 8) { x >>= 8; r += 8; }	496	if (x >> 8) { x >>= 8; r += 8; }
344	if (x >> 4) { x >>= 4; r += 4; }	497	if (x >> 4) { x >>= 4; r += 4; }
345	if (x >> 2) { x >>= 2; r += 2; }	498	if (x >> 2) { x >>= 2; r += 2; }
346	if (x >> 1) { r += 1; }	499	if (x >> 1) { r += 1; }
347		500
348	return r;	501	return r;
		502	#endif
349	}	503	}
350		504
351	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;	505	ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
352	ecb_function_ int ecb_ld64 (uint64_t x)	506	ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
353	{	507	{
		508	#if 1400 <= _MSC_VER && (_M_X64 \|\| _M_IA64 \|\| _M_ARM)
		509	unsigned long r = 0;
		510	_BitScanReverse64 (&r, x);
		511	return (int)r;
		512	#else
354	int r = 0;	513	int r = 0;
355		514
356	if (x >> 32) { x >>= 32; r += 32; }	515	if (x >> 32) { x >>= 32; r += 32; }
357		516
358	return r + ecb_ld32 (x);	517	return r + ecb_ld32 (x);
359	}
360	#endif	518	#endif
		519	}
		520	#endif
361		521
362	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;	522	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
363	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }	523	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
364	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;	524	ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
365	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }	525	ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
366		526
367	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;	527	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
368	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)	528	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
369	{	529	{
370	return ( (x * 0x0802U & 0x22110U)	530	return ( (x * 0x0802U & 0x22110U)
371	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;	531	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
372	}	532	}
373		533
374	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;	534	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
375	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)	535	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
376	{	536	{
377	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);	537	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);
378	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);	538	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);
379	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);	539	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);
380	x = ( x >> 8 ) \| ( x << 8);	540	x = ( x >> 8 ) \| ( x << 8);
381		541
382	return x;	542	return x;
383	}	543	}
384		544
385	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;	545	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
386	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)	546	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
387	{	547	{
388	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);	548	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);
389	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);	549	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);
390	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);	550	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);
391	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);	551	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);
…		…
394	return x;	554	return x;
395	}	555	}
396		556
397	/* popcount64 is only available on 64 bit cpus as gcc builtin */	557	/* popcount64 is only available on 64 bit cpus as gcc builtin */
398	/* so for this version we are lazy */	558	/* so for this version we are lazy */
399	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;	559	ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
400	ecb_function_ int	560	ecb_function_ ecb_const int
401	ecb_popcount64 (uint64_t x)	561	ecb_popcount64 (uint64_t x)
402	{	562	{
403	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);	563	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
404	}	564	}
405		565
406	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;	566	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
407	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;	567	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
408	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;	568	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
409	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;	569	ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
410	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;	570	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
411	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;	571	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
412	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;	572	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
413	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;	573	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
414		574
415	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }	575	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }
416	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }	576	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }
417	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }	577	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }
418	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }	578	ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }
419	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }	579	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }
420	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }	580	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }
421	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }	581	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }
422	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }	582	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }
423		583
424	#if ECB_GCC_VERSION(4,3)	584	#if ECB_GCC_VERSION(4,3) \|\| (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
		585	#if ECB_GCC_VERSION(4,8) \|\| ECB_CLANG_BUILTIN(__builtin_bswap16)
		586	#define ecb_bswap16(x) __builtin_bswap16 (x)
		587	#else
425	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)	588	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
		589	#endif
426	#define ecb_bswap32(x) __builtin_bswap32 (x)	590	#define ecb_bswap32(x) __builtin_bswap32 (x)
427	#define ecb_bswap64(x) __builtin_bswap64 (x)	591	#define ecb_bswap64(x) __builtin_bswap64 (x)
		592	#elif _MSC_VER
		593	#include <stdlib.h>
		594	#define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
		595	#define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
		596	#define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
428	#else	597	#else
429	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;	598	ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
430	ecb_function_ uint16_t	599	ecb_function_ ecb_const uint16_t
431	ecb_bswap16 (uint16_t x)	600	ecb_bswap16 (uint16_t x)
432	{	601	{
433	return ecb_rotl16 (x, 8);	602	return ecb_rotl16 (x, 8);
434	}	603	}
435		604
436	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;	605	ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
437	ecb_function_ uint32_t	606	ecb_function_ ecb_const uint32_t
438	ecb_bswap32 (uint32_t x)	607	ecb_bswap32 (uint32_t x)
439	{	608	{
440	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);	609	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);
441	}	610	}
442		611
443	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;	612	ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
444	ecb_function_ uint64_t	613	ecb_function_ ecb_const uint64_t
445	ecb_bswap64 (uint64_t x)	614	ecb_bswap64 (uint64_t x)
446	{	615	{
447	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);	616	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);
448	}	617	}
449	#endif	618	#endif
450		619
451	#if ECB_GCC_VERSION(4,5)	620	#if ECB_GCC_VERSION(4,5) \|\| ECB_CLANG_BUILTIN(__builtin_unreachable)
452	#define ecb_unreachable() __builtin_unreachable ()	621	#define ecb_unreachable() __builtin_unreachable ()
453	#else	622	#else
454	/* this seems to work fine, but gcc always emits a warning for it :/ */	623	/* this seems to work fine, but gcc always emits a warning for it :/ */
455	ecb_inline void ecb_unreachable (void) ecb_noreturn;	624	ecb_inline ecb_noreturn void ecb_unreachable (void);
456	ecb_inline void ecb_unreachable (void) { }	625	ecb_inline ecb_noreturn void ecb_unreachable (void) { }
457	#endif	626	#endif
458		627
459	/* try to tell the compiler that some condition is definitely true */	628	/* try to tell the compiler that some condition is definitely true */
460	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)	629	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
461		630
462	ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;	631	ecb_inline ecb_const unsigned char ecb_byteorder_helper (void);
463	ecb_inline unsigned char	632	ecb_inline ecb_const unsigned char
464	ecb_byteorder_helper (void)	633	ecb_byteorder_helper (void)
465	{	634	{
466	const uint32_t u = 0x11223344;	635	/* the union code still generates code under pressure in gcc, */
467	return (unsigned char )&u;	636	/* but less than using pointers, and always seems to */
		637	/* successfully return a constant. */
		638	/* the reason why we have this horrible preprocessor mess */
		639	/* is to avoid it in all cases, at least on common architectures */
		640	/* or when using a recent enough gcc version (>= 4.6) */
		641	#if ((__i386 \|\| __i386__) && !__VOS__) \|\| _M_IX86 \|\| ECB_GCC_AMD64 \|\| ECB_MSVC_AMD64
		642	return 0x44;
		643	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
		644	return 0x44;
		645	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
		646	return 0x11;
		647	#else
		648	union
		649	{
		650	uint32_t i;
		651	uint8_t c;
		652	} u = { 0x11223344 };
		653	return u.c;
		654	#endif
468	}	655	}
469		656
470	ecb_inline ecb_bool ecb_big_endian (void) ecb_const;	657	ecb_inline ecb_const ecb_bool ecb_big_endian (void);
471	ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }	658	ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
472	ecb_inline ecb_bool ecb_little_endian (void) ecb_const;	659	ecb_inline ecb_const ecb_bool ecb_little_endian (void);
473	ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }	660	ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
474		661
475	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99	662	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
476	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))	663	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
477	#else	664	#else
478	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))	665	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
479	#endif	666	#endif
480		667
481	#if __cplusplus	668	#if ECB_CPP
482	template<typename T>	669	template<typename T>
483	static inline T ecb_div_rd (T val, T div)	670	static inline T ecb_div_rd (T val, T div)
484	{	671	{
485	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;	672	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
486	}	673	}
…		…
503	}	690	}
504	#else	691	#else
505	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	692	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
506	#endif	693	#endif
507		694
		695	ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
		696	ecb_function_ ecb_const uint32_t
		697	ecb_binary16_to_binary32 (uint32_t x)
		698	{
		699	unsigned int s = (x & 0x8000) << (31 - 15);
		700	int e = (x >> 10) & 0x001f;
		701	unsigned int m = x & 0x03ff;
		702
		703	if (ecb_expect_false (e == 31))
		704	/* infinity or NaN */
		705	e = 255 - (127 - 15);
		706	else if (ecb_expect_false (!e))
		707	{
		708	if (ecb_expect_true (!m))
		709	/* zero, handled by code below by forcing e to 0 */
		710	e = 0 - (127 - 15);
		711	else
		712	{
		713	/* subnormal, renormalise */
		714	unsigned int s = 10 - ecb_ld32 (m);
		715
		716	m = (m << s) & 0x3ff; /* mask implicit bit */
		717	e -= s - 1;
		718	}
		719	}
		720
		721	/* e and m now are normalised, or zero, (or inf or nan) */
		722	e += 127 - 15;
		723
		724	return s \| (e << 23) \| (m << (23 - 10));
		725	}
		726
		727	ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
		728	ecb_function_ ecb_const uint16_t
		729	ecb_binary32_to_binary16 (uint32_t x)
		730	{
		731	unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
		732	unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
		733	unsigned int m = x & 0x007fffff;
		734
		735	x &= 0x7fffffff;
		736
		737	/* if it's within range of binary16 normals, use fast path */
		738	if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
		739	{
		740	/* mantissa round-to-even */
		741	m += 0x00000fff + ((m >> (23 - 10)) & 1);
		742
		743	/* handle overflow */
		744	if (ecb_expect_false (m >= 0x00800000))
		745	{
		746	m >>= 1;
		747	e += 1;
		748	}
		749
		750	return s \| (e << 10) \| (m >> (23 - 10));
		751	}
		752
		753	/* handle large numbers and infinity */
		754	if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
		755	return s \| 0x7c00;
		756
		757	/* handle zero, subnormals and small numbers */
		758	if (ecb_expect_true (x < 0x38800000))
		759	{
		760	/* zero */
		761	if (ecb_expect_true (!x))
		762	return s;
		763
		764	/* handle subnormals */
		765
		766	/* too small, will be zero */
		767	if (e < (14 - 24)) /* might not be sharp, but is good enough */
		768	return s;
		769
		770	m \|= 0x00800000; /* make implicit bit explicit */
		771
		772	/* very tricky - we need to round to the nearest e (+10) bit value */
		773	{
		774	unsigned int bits = 14 - e;
		775	unsigned int half = (1 << (bits - 1)) - 1;
		776	unsigned int even = (m >> bits) & 1;
		777
		778	/* if this overflows, we will end up with a normalised number */
		779	m = (m + half + even) >> bits;
		780	}
		781
		782	return s \| m;
		783	}
		784
		785	/* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
		786	m >>= 13;
		787
		788	return s \| 0x7c00 \| m \| !m;
		789	}
		790
		791	/*******************************************************************************/
		792	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
		793
		794	/* basically, everything uses "ieee pure-endian" floating point numbers */
		795	/* the only noteworthy exception is ancient armle, which uses order 43218765 */
		796	#if 0 \
		797	\|\| __i386 \|\| __i386__ \
		798	\|\| ECB_GCC_AMD64 \
		799	\|\| __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__ \
		800	\|\| defined __s390__ \|\| defined __s390x__ \
		801	\|\| defined __mips__ \
		802	\|\| defined __alpha__ \
		803	\|\| defined __hppa__ \
		804	\|\| defined __ia64__ \
		805	\|\| defined __m68k__ \
		806	\|\| defined __m88k__ \
		807	\|\| defined __sh__ \
		808	\|\| defined _M_IX86 \|\| defined ECB_MSVC_AMD64 \|\| defined _M_IA64 \
		809	\|\| (defined __arm__ && (defined __ARM_EABI__ \|\| defined __EABI__ \|\| defined __VFP_FP__ \|\| defined _WIN32_WCE \|\| defined __ANDROID__)) \
		810	\|\| defined __aarch64__
		811	#define ECB_STDFP 1
		812	#include <string.h> /* for memcpy */
		813	#else
		814	#define ECB_STDFP 0
		815	#endif
		816
		817	#ifndef ECB_NO_LIBM
		818
		819	#include <math.h> /* for frexp, ldexp, INFINITY, NAN */
		820
		821	/* only the oldest of old doesn't have this one. solaris. */
		822	#ifdef INFINITY
		823	#define ECB_INFINITY INFINITY
		824	#else
		825	#define ECB_INFINITY HUGE_VAL
508	#endif	826	#endif
509		827
		828	#ifdef NAN
		829	#define ECB_NAN NAN
		830	#else
		831	#define ECB_NAN ECB_INFINITY
		832	#endif
		833
		834	#if ECB_C99 \|\| _XOPEN_VERSION >= 600 \|\| _POSIX_VERSION >= 200112L
		835	#define ecb_ldexpf(x,e) ldexpf ((x), (e))
		836	#define ecb_frexpf(x,e) frexpf ((x), (e))
		837	#else
		838	#define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
		839	#define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
		840	#endif
		841
		842	/* convert a float to ieee single/binary32 */
		843	ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
		844	ecb_function_ ecb_const uint32_t
		845	ecb_float_to_binary32 (float x)
		846	{
		847	uint32_t r;
		848
		849	#if ECB_STDFP
		850	memcpy (&r, &x, 4);
		851	#else
		852	/* slow emulation, works for anything but -0 */
		853	uint32_t m;
		854	int e;
		855
		856	if (x == 0e0f ) return 0x00000000U;
		857	if (x > +3.40282346638528860e+38f) return 0x7f800000U;
		858	if (x < -3.40282346638528860e+38f) return 0xff800000U;
		859	if (x != x ) return 0x7fbfffffU;
		860
		861	m = ecb_frexpf (x, &e) * 0x1000000U;
		862
		863	r = m & 0x80000000U;
		864
		865	if (r)
		866	m = -m;
		867
		868	if (e <= -126)
		869	{
		870	m &= 0xffffffU;
		871	m >>= (-125 - e);
		872	e = -126;
		873	}
		874
		875	r \|= (e + 126) << 23;
		876	r \|= m & 0x7fffffU;
		877	#endif
		878
		879	return r;
		880	}
		881
		882	/* converts an ieee single/binary32 to a float */
		883	ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
		884	ecb_function_ ecb_const float
		885	ecb_binary32_to_float (uint32_t x)
		886	{
		887	float r;
		888
		889	#if ECB_STDFP
		890	memcpy (&r, &x, 4);
		891	#else
		892	/* emulation, only works for normals and subnormals and +0 */
		893	int neg = x >> 31;
		894	int e = (x >> 23) & 0xffU;
		895
		896	x &= 0x7fffffU;
		897
		898	if (e)
		899	x \|= 0x800000U;
		900	else
		901	e = 1;
		902
		903	/* we distrust ldexpf a bit and do the 2*-24 scaling by an extra multiply /
		904	r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
		905
		906	r = neg ? -r : r;
		907	#endif
		908
		909	return r;
		910	}
		911
		912	/* convert a double to ieee double/binary64 */
		913	ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
		914	ecb_function_ ecb_const uint64_t
		915	ecb_double_to_binary64 (double x)
		916	{
		917	uint64_t r;
		918
		919	#if ECB_STDFP
		920	memcpy (&r, &x, 8);
		921	#else
		922	/* slow emulation, works for anything but -0 */
		923	uint64_t m;
		924	int e;
		925
		926	if (x == 0e0 ) return 0x0000000000000000U;
		927	if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
		928	if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
		929	if (x != x ) return 0X7ff7ffffffffffffU;
		930
		931	m = frexp (x, &e) * 0x20000000000000U;
		932
		933	r = m & 0x8000000000000000;;
		934
		935	if (r)
		936	m = -m;
		937
		938	if (e <= -1022)
		939	{
		940	m &= 0x1fffffffffffffU;
		941	m >>= (-1021 - e);
		942	e = -1022;
		943	}
		944
		945	r \|= ((uint64_t)(e + 1022)) << 52;
		946	r \|= m & 0xfffffffffffffU;
		947	#endif
		948
		949	return r;
		950	}
		951
		952	/* converts an ieee double/binary64 to a double */
		953	ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
		954	ecb_function_ ecb_const double
		955	ecb_binary64_to_double (uint64_t x)
		956	{
		957	double r;
		958
		959	#if ECB_STDFP
		960	memcpy (&r, &x, 8);
		961	#else
		962	/* emulation, only works for normals and subnormals and +0 */
		963	int neg = x >> 63;
		964	int e = (x >> 52) & 0x7ffU;
		965
		966	x &= 0xfffffffffffffU;
		967
		968	if (e)
		969	x \|= 0x10000000000000U;
		970	else
		971	e = 1;
		972
		973	/* we distrust ldexp a bit and do the 2*-53 scaling by an extra multiply /
		974	r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
		975
		976	r = neg ? -r : r;
		977	#endif
		978
		979	return r;
		980	}
		981
		982	/* convert a float to ieee half/binary16 */
		983	ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
		984	ecb_function_ ecb_const uint16_t
		985	ecb_float_to_binary16 (float x)
		986	{
		987	return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
		988	}
		989
		990	/* convert an ieee half/binary16 to float */
		991	ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
		992	ecb_function_ ecb_const float
		993	ecb_binary16_to_float (uint16_t x)
		994	{
		995	return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
		996	}
		997
		998	#endif
		999
		1000	#endif
		1001

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Comparing libecb/ecb.h (file contents): Revision 1.92 by root, Tue May 29 17:17:56 2012 UTC vs. Revision 1.171 by root, Tue Nov 24 19:46:20 2015 UTC

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Comparing libecb/ecb.h (file contents):
Revision 1.92 by root, Tue May 29 17:17:56 2012 UTC vs.
Revision 1.171 by root, Tue Nov 24 19:46:20 2015 UTC