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

Comparing libeio/ecb.h (file contents):
Revision 1.7 by root, Wed Aug 3 15:25:38 2011 UTC vs.
Revision 1.29 by root, Fri Aug 23 07:20:21 2019 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 (©) 2009-2015 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
		43
		44	/* 16 bits major, 16 bits minor */
		45	#define ECB_VERSION 0x00010006
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 (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
		73	#define ECB_PTRSIZE 8
		74	#else
		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
		88	#endif
49	#endif	89	#endif
50		90
51	/* many compilers define _GNUC_ to some versions but then only implement	91	/* many compilers define _GNUC_ to some versions but then only implement
52	* what their idiot authors think are the "more important" extensions,	92	* what their idiot authors think are the "more important" extensions,
53	* causing enourmous grief in return for some better fake benchmark numbers.	93	* causing enormous grief in return for some better fake benchmark numbers.
54	* or so.	94	* or so.
55	* 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
56	* 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.
57	*/	97	*/
58	#ifndef ECB_GCC_VERSION
59	#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__
60	#define ECB_GCC_VERSION(major,minor) 0	99	#define ECB_GCC_VERSION(major,minor) 0
61	#else	100	#else
62	#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)))
63	#endif	102	#endif
		103
		104	#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) \|\| (__clang_major__ == (major) && __clang_minor__ >= (minor)))
		105
		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
		118	#define ECB_CPP (__cplusplus+0)
		119	#define ECB_CPP11 (__cplusplus >= 201103L)
		120	#define ECB_CPP14 (__cplusplus >= 201402L)
		121	#define ECB_CPP17 (__cplusplus >= 201703L)
		122
		123	#if ECB_CPP
		124	#define ECB_C 0
		125	#define ECB_STDC_VERSION 0
		126	#else
		127	#define ECB_C 1
		128	#define ECB_STDC_VERSION __STDC_VERSION__
		129	#endif
		130
		131	#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
		132	#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
		133	#define ECB_C17 (ECB_STDC_VERSION >= 201710L)
		134
		135	#if ECB_CPP
		136	#define ECB_EXTERN_C extern "C"
		137	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {
		138	#define ECB_EXTERN_C_END }
		139	#else
		140	#define ECB_EXTERN_C extern
		141	#define ECB_EXTERN_C_BEG
		142	#define ECB_EXTERN_C_END
64	#endif	143	#endif
65		144
66	/*****************************************************************************/	145	/*****************************************************************************/
67		146
		147	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
		148	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
		149
		150	#if ECB_NO_THREADS
		151	#define ECB_NO_SMP 1
		152	#endif
		153
		154	#if ECB_NO_SMP
		155	#define ECB_MEMORY_FENCE do { } while (0)
		156	#endif
		157
		158	/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
		159	#if __xlC__ && ECB_CPP
		160	#include <builtins.h>
		161	#endif
		162
		163	#if 1400 <= _MSC_VER
		164	#include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
		165	#endif
		166
68	#ifndef ECB_MEMORY_FENCE	167	#ifndef ECB_MEMORY_FENCE
69	#if ECB_GCC_VERSION(2,5)	168	#if ECB_GCC_VERSION(2,5) \|\| defined __INTEL_COMPILER \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
70	#if __x86	169	#define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory")
		170	#if __i386 \|\| __i386__
71	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")	171	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
72	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */	172	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
73	#define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */	173	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
74	#elif __amd64	174	#elif ECB_GCC_AMD64
75	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")	175	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
76	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")	176	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
77	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */	177	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
		178	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__
		179	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		180	#elif defined __ARM_ARCH_2__ \
		181	\|\| defined __ARM_ARCH_3__ \|\| defined __ARM_ARCH_3M__ \
		182	\|\| defined __ARM_ARCH_4__ \|\| defined __ARM_ARCH_4T__ \
		183	\|\| defined __ARM_ARCH_5__ \|\| defined __ARM_ARCH_5E__ \
		184	\|\| defined __ARM_ARCH_5T__ \|\| defined __ARM_ARCH_5TE__ \
		185	\|\| defined __ARM_ARCH_5TEJ__
		186	/* should not need any, unless running old code on newer cpu - arm doesn't support that */
		187	#elif defined __ARM_ARCH_6__ \|\| defined __ARM_ARCH_6J__ \
		188	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__ \
		189	\|\| defined __ARM_ARCH_6T2__
		190	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
		191	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \
		192	\|\| defined __ARM_ARCH_7R__ \|\| defined __ARM_ARCH_7M__
		193	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
		194	#elif __aarch64__
		195	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
		196	#elif (__sparc \|\| __sparc__) && !(__sparc_v8__ \|\| defined __sparcv8)
		197	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad" : : : "memory")
		198	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
		199	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
		200	#elif defined __s390__ \|\| defined __s390x__
		201	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
		202	#elif defined __mips__
		203	/* GNU/Linux emulates sync on mips1 architectures, so we force its use */
		204	/* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
		205	#define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
		206	#elif defined __alpha__
		207	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
		208	#elif defined __hppa__
		209	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		210	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		211	#elif defined __ia64__
		212	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
		213	#elif defined __m68k__
		214	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		215	#elif defined __m88k__
		216	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
		217	#elif defined __sh__
		218	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
78	#endif	219	#endif
79	#endif	220	#endif
80	#endif	221	#endif
81		222
82	#ifndef ECB_MEMORY_FENCE	223	#ifndef ECB_MEMORY_FENCE
83	#if ECB_GCC_VERSION(4,4)	224	#if ECB_GCC_VERSION(4,7)
		225	/* see comment below (stdatomic.h) about the C11 memory model. */
		226	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
		227	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
		228	#define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
		229	#define ECB_MEMORY_FENCE_RELAXED __atomic_thread_fence (__ATOMIC_RELAXED)
		230
		231	#elif ECB_CLANG_EXTENSION(c_atomic)
		232	/* see comment below (stdatomic.h) about the C11 memory model. */
		233	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
		234	#define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
		235	#define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
		236	#define ECB_MEMORY_FENCE_RELAXED __c11_atomic_thread_fence (__ATOMIC_RELAXED)
		237
		238	#elif ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__
84	#define ECB_MEMORY_FENCE __sync_synchronize ()	239	#define ECB_MEMORY_FENCE __sync_synchronize ()
85	#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); })	240	#elif _MSC_VER >= 1500 /* VC++ 2008 */
86	#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); })	241	/* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
		242	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		243	#define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
		244	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
		245	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
87	#elif _MSC_VER >= 1400 /* VC++ 2005 */	246	#elif _MSC_VER >= 1400 /* VC++ 2005 */
88	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)	247	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
89	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()	248	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
90	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */	249	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
91	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()	250	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
92	#elif defined(_WIN32)	251	#elif defined _WIN32
93	#include <WinNT.h>	252	#include <WinNT.h>
94	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */	253	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
95	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE	254	#elif __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
96	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE	255	#include <mbarrier.h>
		256	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
		257	#define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier ()
		258	#define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier ()
		259	#define ECB_MEMORY_FENCE_RELAXED __compiler_barrier ()
		260	#elif __xlC__
		261	#define ECB_MEMORY_FENCE __sync ()
97	#endif	262	#endif
98	#endif	263	#endif
99		264
100	#ifndef ECB_MEMORY_FENCE	265	#ifndef ECB_MEMORY_FENCE
		266	#if ECB_C11 && !defined __STDC_NO_ATOMICS__
		267	/* we assume that these memory fences work on all variables/all memory accesses, */
		268	/* not just C11 atomics and atomic accesses */
		269	#include <stdatomic.h>
		270	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
		271	#define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
		272	#define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
		273	#endif
		274	#endif
		275
		276	#ifndef ECB_MEMORY_FENCE
		277	#if !ECB_AVOID_PTHREADS
101	/*	278	/*
102	* if you get undefined symbol references to pthread_mutex_lock,	279	* if you get undefined symbol references to pthread_mutex_lock,
103	* or failure to find pthread.h, then you should implement	280	* or failure to find pthread.h, then you should implement
104	* the ECB_MEMORY_FENCE operations for your cpu/compiler	281	* the ECB_MEMORY_FENCE operations for your cpu/compiler
105	* OR proide pthread.h and link against the posix thread library	282	* OR provide pthread.h and link against the posix thread library
106	* of your system.	283	* of your system.
107	*/	284	*/
108	#include <pthread.h>	285	#include <pthread.h>
		286	#define ECB_NEEDS_PTHREADS 1
		287	#define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
109		288
110	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;	289	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
111	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)	290	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
		291	#endif
		292	#endif
		293
		294	#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
112	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE	295	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
		296	#endif
		297
		298	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
113	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE	299	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
114	#endif	300	#endif
115		301
		302	#if !defined ECB_MEMORY_FENCE_RELAXED && defined ECB_MEMORY_FENCE
		303	#define ECB_MEMORY_FENCE_RELAXED ECB_MEMORY_FENCE /* very heavy-handed */
		304	#endif
		305
116	/*****************************************************************************/	306	/*****************************************************************************/
117		307
118	#define ECB_C99 (__STDC_VERSION__ >= 199901L)	308	#if ECB_CPP
119
120	#if __cplusplus
121	#define ecb_inline static inline	309	#define ecb_inline static inline
122	#elif ECB_GCC_VERSION(2,5)	310	#elif ECB_GCC_VERSION(2,5)
123	#define ecb_inline static __inline__	311	#define ecb_inline static __inline__
124	#elif ECB_C99	312	#elif ECB_C99
125	#define ecb_inline static inline	313	#define ecb_inline static inline
…		…
139		327
140	#define ECB_CONCAT_(a, b) a ## b	328	#define ECB_CONCAT_(a, b) a ## b
141	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	329	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
142	#define ECB_STRINGIFY_(a) # a	330	#define ECB_STRINGIFY_(a) # a
143	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)	331	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
		332	#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
144		333
145	#define ecb_function_ ecb_inline	334	#define ecb_function_ ecb_inline
146		335
147	#if ECB_GCC_VERSION(3,1)	336	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_VERSION(2,8)
148	#define ecb_attribute(attrlist) __attribute__(attrlist)	337	#define ecb_attribute(attrlist) __attribute__ (attrlist)
		338	#else
		339	#define ecb_attribute(attrlist)
		340	#endif
		341
		342	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_constant_p)
149	#define ecb_is_constant(expr) __builtin_constant_p (expr)	343	#define ecb_is_constant(expr) __builtin_constant_p (expr)
		344	#else
		345	/* possible C11 impl for integral types
		346	typedef struct ecb_is_constant_struct ecb_is_constant_struct;
		347	#define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct )0 : (void )((expr) - (expr)), ecb_is_constant_struct : 0, default: 1)) /
		348
		349	#define ecb_is_constant(expr) 0
		350	#endif
		351
		352	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_expect)
150	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))	353	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
		354	#else
		355	#define ecb_expect(expr,value) (expr)
		356	#endif
		357
		358	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_prefetch)
151	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)	359	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
152	#else	360	#else
153	#define ecb_attribute(attrlist)
154	#define ecb_is_constant(expr) 0
155	#define ecb_expect(expr,value) (expr)
156	#define ecb_prefetch(addr,rw,locality)	361	#define ecb_prefetch(addr,rw,locality)
157	#endif	362	#endif
158		363
159	/* no emulation for ecb_decltype */	364	/* no emulation for ecb_decltype */
160	#if ECB_GCC_VERSION(4,5)	365	#if ECB_CPP11
		366	// older implementations might have problems with decltype(x)::type, work around it
		367	template<class T> struct ecb_decltype_t { typedef T type; };
161	#define ecb_decltype(x) __decltype(x)	368	#define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
162	#elif ECB_GCC_VERSION(3,0)	369	#elif ECB_GCC_VERSION(3,0) \|\| ECB_CLANG_VERSION(2,8)
163	#define ecb_decltype(x) __typeof(x)	370	#define ecb_decltype(x) __typeof__ (x)
164	#endif	371	#endif
165		372
		373	#if _MSC_VER >= 1300
		374	#define ecb_deprecated __declspec (deprecated)
		375	#else
		376	#define ecb_deprecated ecb_attribute ((__deprecated__))
		377	#endif
		378
		379	#if _MSC_VER >= 1500
		380	#define ecb_deprecated_message(msg) __declspec (deprecated (msg))
		381	#elif ECB_GCC_VERSION(4,5)
		382	#define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
		383	#else
		384	#define ecb_deprecated_message(msg) ecb_deprecated
		385	#endif
		386
		387	#if _MSC_VER >= 1400
		388	#define ecb_noinline __declspec (noinline)
		389	#else
166	#define ecb_noinline ecb_attribute ((__noinline__))	390	#define ecb_noinline ecb_attribute ((__noinline__))
167	#define ecb_noreturn ecb_attribute ((__noreturn__))	391	#endif
		392
168	#define ecb_unused ecb_attribute ((__unused__))	393	#define ecb_unused ecb_attribute ((__unused__))
169	#define ecb_const ecb_attribute ((__const__))	394	#define ecb_const ecb_attribute ((__const__))
170	#define ecb_pure ecb_attribute ((__pure__))	395	#define ecb_pure ecb_attribute ((__pure__))
		396
		397	#if ECB_C11 \|\| __IBMC_NORETURN
		398	/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
		399	#define ecb_noreturn _Noreturn
		400	#elif ECB_CPP11
		401	#define ecb_noreturn [[noreturn]]
		402	#elif _MSC_VER >= 1200
		403	/* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
		404	#define ecb_noreturn __declspec (noreturn)
		405	#else
		406	#define ecb_noreturn ecb_attribute ((__noreturn__))
		407	#endif
171		408
172	#if ECB_GCC_VERSION(4,3)	409	#if ECB_GCC_VERSION(4,3)
173	#define ecb_artificial ecb_attribute ((__artificial__))	410	#define ecb_artificial ecb_attribute ((__artificial__))
174	#define ecb_hot ecb_attribute ((__hot__))	411	#define ecb_hot ecb_attribute ((__hot__))
175	#define ecb_cold ecb_attribute ((__cold__))	412	#define ecb_cold ecb_attribute ((__cold__))
…		…
187	/* for compatibility to the rest of the world */	424	/* for compatibility to the rest of the world */
188	#define ecb_likely(expr) ecb_expect_true (expr)	425	#define ecb_likely(expr) ecb_expect_true (expr)
189	#define ecb_unlikely(expr) ecb_expect_false (expr)	426	#define ecb_unlikely(expr) ecb_expect_false (expr)
190		427
191	/* count trailing zero bits and count # of one bits */	428	/* count trailing zero bits and count # of one bits */
192	#if ECB_GCC_VERSION(3,4)	429	#if ECB_GCC_VERSION(3,4) \
		430	\|\| (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
		431	&& ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
		432	&& ECB_CLANG_BUILTIN(__builtin_popcount))
193	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */	433	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
194	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)	434	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
195	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)	435	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
196	#define ecb_ctz32(x) __builtin_ctz (x)	436	#define ecb_ctz32(x) __builtin_ctz (x)
197	#define ecb_ctz64(x) __builtin_ctzll (x)	437	#define ecb_ctz64(x) __builtin_ctzll (x)
198	#define ecb_popcount32(x) __builtin_popcount (x)	438	#define ecb_popcount32(x) __builtin_popcount (x)
199	/* no popcountll */	439	/* no popcountll */
200	#else	440	#else
201	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;	441	ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
202	ecb_function_ int	442	ecb_function_ ecb_const int
203	ecb_ctz32 (uint32_t x)	443	ecb_ctz32 (uint32_t x)
204	{	444	{
		445	#if 1400 <= _MSC_VER && (_M_IX86 \|\| _M_X64 \|\| _M_IA64 \|\| _M_ARM)
		446	unsigned long r;
		447	_BitScanForward (&r, x);
		448	return (int)r;
		449	#else
205	int r = 0;	450	int r = 0;
206		451
207	x &= ~x + 1; /* this isolates the lowest bit */	452	x &= ~x + 1; /* this isolates the lowest bit */
208		453
209	#if ECB_branchless_on_i386	454	#if ECB_branchless_on_i386
…		…
219	if (x & 0xff00ff00) r += 8;	464	if (x & 0xff00ff00) r += 8;
220	if (x & 0xffff0000) r += 16;	465	if (x & 0xffff0000) r += 16;
221	#endif	466	#endif
222		467
223	return r;	468	return r;
		469	#endif
224	}	470	}
225		471
226	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;	472	ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
227	ecb_function_ int	473	ecb_function_ ecb_const int
228	ecb_ctz64 (uint64_t x)	474	ecb_ctz64 (uint64_t x)
229	{	475	{
		476	#if 1400 <= _MSC_VER && (_M_X64 \|\| _M_IA64 \|\| _M_ARM)
		477	unsigned long r;
		478	_BitScanForward64 (&r, x);
		479	return (int)r;
		480	#else
230	int shift = x & 0xffffffffU ? 0 : 32;	481	int shift = x & 0xffffffff ? 0 : 32;
231	return ecb_ctz32 (x >> shift) + shift;	482	return ecb_ctz32 (x >> shift) + shift;
		483	#endif
232	}	484	}
233		485
234	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;	486	ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
235	ecb_function_ int	487	ecb_function_ ecb_const int
236	ecb_popcount32 (uint32_t x)	488	ecb_popcount32 (uint32_t x)
237	{	489	{
238	x -= (x >> 1) & 0x55555555;	490	x -= (x >> 1) & 0x55555555;
239	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);	491	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
240	x = ((x >> 4) + x) & 0x0f0f0f0f;	492	x = ((x >> 4) + x) & 0x0f0f0f0f;
241	x *= 0x01010101;	493	x *= 0x01010101;
242		494
243	return x >> 24;	495	return x >> 24;
244	}	496	}
245		497
246	/* you have the choice beetween something with a table lookup, */
247	/* something using lots of bit arithmetic and a simple loop */
248	/* we went for the loop */
249	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;	498	ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
250	ecb_function_ int ecb_ld32 (uint32_t x)	499	ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
251	{	500	{
		501	#if 1400 <= _MSC_VER && (_M_IX86 \|\| _M_X64 \|\| _M_IA64 \|\| _M_ARM)
		502	unsigned long r;
		503	_BitScanReverse (&r, x);
		504	return (int)r;
		505	#else
252	int r = 0;	506	int r = 0;
253		507
254	if (x >> 16) { x >>= 16; r += 16; }	508	if (x >> 16) { x >>= 16; r += 16; }
255	if (x >> 8) { x >>= 8; r += 8; }	509	if (x >> 8) { x >>= 8; r += 8; }
256	if (x >> 4) { x >>= 4; r += 4; }	510	if (x >> 4) { x >>= 4; r += 4; }
257	if (x >> 2) { x >>= 2; r += 2; }	511	if (x >> 2) { x >>= 2; r += 2; }
258	if (x >> 1) { r += 1; }	512	if (x >> 1) { r += 1; }
259		513
260	return r;	514	return r;
		515	#endif
261	}	516	}
262		517
263	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;	518	ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
264	ecb_function_ int ecb_ld64 (uint64_t x)	519	ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
265	{	520	{
		521	#if 1400 <= _MSC_VER && (_M_X64 \|\| _M_IA64 \|\| _M_ARM)
		522	unsigned long r;
		523	_BitScanReverse64 (&r, x);
		524	return (int)r;
		525	#else
266	int r = 0;	526	int r = 0;
267		527
268	if (x >> 32) { x >>= 32; r += 32; }	528	if (x >> 32) { x >>= 32; r += 32; }
269		529
270	return r + ecb_ld32 (x);	530	return r + ecb_ld32 (x);
271	}
272	#endif	531	#endif
		532	}
		533	#endif
		534
		535	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
		536	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
		537	ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
		538	ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
		539
		540	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
		541	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
		542	{
		543	return ( (x * 0x0802U & 0x22110U)
		544	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
		545	}
		546
		547	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
		548	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
		549	{
		550	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);
		551	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);
		552	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);
		553	x = ( x >> 8 ) \| ( x << 8);
		554
		555	return x;
		556	}
		557
		558	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
		559	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
		560	{
		561	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);
		562	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);
		563	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);
		564	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);
		565	x = ( x >> 16 ) \| ( x << 16);
		566
		567	return x;
		568	}
273		569
274	/* popcount64 is only available on 64 bit cpus as gcc builtin */	570	/* popcount64 is only available on 64 bit cpus as gcc builtin */
275	/* so for this version we are lazy */	571	/* so for this version we are lazy */
276	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;	572	ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
277	ecb_function_ int	573	ecb_function_ ecb_const int
278	ecb_popcount64 (uint64_t x)	574	ecb_popcount64 (uint64_t x)
279	{	575	{
280	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);	576	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
281	}	577	}
282		578
283	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;	579	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
284	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;	580	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
285	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;	581	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
286	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;	582	ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
287	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;	583	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
288	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;	584	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
289	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;	585	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
290	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;	586	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
291		587
292	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }	588	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }
293	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }	589	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }
294	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }	590	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }
295	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }	591	ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }
296	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }	592	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }
297	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }	593	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }
298	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }	594	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }
299	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }	595	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }
300		596
301	#if ECB_GCC_VERSION(4,3)	597	#if ECB_GCC_VERSION(4,3) \|\| (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
		598	#if ECB_GCC_VERSION(4,8) \|\| ECB_CLANG_BUILTIN(__builtin_bswap16)
		599	#define ecb_bswap16(x) __builtin_bswap16 (x)
		600	#else
302	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)	601	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
		602	#endif
303	#define ecb_bswap32(x) __builtin_bswap32 (x)	603	#define ecb_bswap32(x) __builtin_bswap32 (x)
304	#define ecb_bswap64(x) __builtin_bswap64 (x)	604	#define ecb_bswap64(x) __builtin_bswap64 (x)
		605	#elif _MSC_VER
		606	#include <stdlib.h>
		607	#define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
		608	#define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
		609	#define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
305	#else	610	#else
306	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;	611	ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
307	ecb_function_ uint16_t	612	ecb_function_ ecb_const uint16_t
308	ecb_bswap16 (uint16_t x)	613	ecb_bswap16 (uint16_t x)
309	{	614	{
310	return ecb_rotl16 (x, 8);	615	return ecb_rotl16 (x, 8);
311	}	616	}
312		617
313	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;	618	ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
314	ecb_function_ uint32_t	619	ecb_function_ ecb_const uint32_t
315	ecb_bswap32 (uint32_t x)	620	ecb_bswap32 (uint32_t x)
316	{	621	{
317	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);	622	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);
318	}	623	}
319		624
320	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;	625	ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
321	ecb_function_ uint64_t	626	ecb_function_ ecb_const uint64_t
322	ecb_bswap64 (uint64_t x)	627	ecb_bswap64 (uint64_t x)
323	{	628	{
324	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);	629	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);
325	}	630	}
326	#endif	631	#endif
327		632
328	#if ECB_GCC_VERSION(4,5)	633	#if ECB_GCC_VERSION(4,5) \|\| ECB_CLANG_BUILTIN(__builtin_unreachable)
329	#define ecb_unreachable() __builtin_unreachable ()	634	#define ecb_unreachable() __builtin_unreachable ()
330	#else	635	#else
331	/* this seems to work fine, but gcc always emits a warning for it :/ */	636	/* this seems to work fine, but gcc always emits a warning for it :/ */
332	ecb_function_ void ecb_unreachable (void) ecb_noreturn;	637	ecb_inline ecb_noreturn void ecb_unreachable (void);
333	ecb_function_ void ecb_unreachable (void) { }	638	ecb_inline ecb_noreturn void ecb_unreachable (void) { }
334	#endif	639	#endif
335		640
336	/* try to tell the compiler that some condition is definitely true */	641	/* try to tell the compiler that some condition is definitely true */
337	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)	642	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
338		643
339	ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;	644	ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
340	ecb_function_ unsigned char	645	ecb_inline ecb_const uint32_t
341	ecb_byteorder_helper (void)	646	ecb_byteorder_helper (void)
342	{	647	{
343	const uint32_t u = 0x11223344;	648	/* the union code still generates code under pressure in gcc, */
344	return (unsigned char )&u;	649	/* but less than using pointers, and always seems to */
		650	/* successfully return a constant. */
		651	/* the reason why we have this horrible preprocessor mess */
		652	/* is to avoid it in all cases, at least on common architectures */
		653	/* or when using a recent enough gcc version (>= 4.6) */
		654	#if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
		655	\|\| ((__i386 \|\| __i386__ \|\| _M_IX86 \|\| ECB_GCC_AMD64 \|\| ECB_MSVC_AMD64) && !__VOS__)
		656	#define ECB_LITTLE_ENDIAN 1
		657	return 0x44332211;
		658	#elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
		659	\|\| ((__AARCH64EB__ \|\| __MIPSEB__ \|\| __ARMEB__) && !__VOS__)
		660	#define ECB_BIG_ENDIAN 1
		661	return 0x11223344;
		662	#else
		663	union
		664	{
		665	uint8_t c[4];
		666	uint32_t u;
		667	} u = { 0x11, 0x22, 0x33, 0x44 };
		668	return u.u;
		669	#endif
345	}	670	}
346		671
347	ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;	672	ecb_inline ecb_const ecb_bool ecb_big_endian (void);
348	ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }	673	ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
349	ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;	674	ecb_inline ecb_const ecb_bool ecb_little_endian (void);
350	ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }	675	ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
351		676
352	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99	677	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
353	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))	678	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
354	#else	679	#else
355	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))	680	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
		681	#endif
		682
		683	#if ECB_CPP
		684	template<typename T>
		685	static inline T ecb_div_rd (T val, T div)
		686	{
		687	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
		688	}
		689	template<typename T>
		690	static inline T ecb_div_ru (T val, T div)
		691	{
		692	return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
		693	}
		694	#else
		695	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
		696	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
356	#endif	697	#endif
357		698
358	#if ecb_cplusplus_does_not_suck	699	#if ecb_cplusplus_does_not_suck
359	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */	700	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
360	template<typename T, int N>	701	template<typename T, int N>
…		…
364	}	705	}
365	#else	706	#else
366	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	707	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
367	#endif	708	#endif
368		709
		710	ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
		711	ecb_function_ ecb_const uint32_t
		712	ecb_binary16_to_binary32 (uint32_t x)
		713	{
		714	unsigned int s = (x & 0x8000) << (31 - 15);
		715	int e = (x >> 10) & 0x001f;
		716	unsigned int m = x & 0x03ff;
		717
		718	if (ecb_expect_false (e == 31))
		719	/* infinity or NaN */
		720	e = 255 - (127 - 15);
		721	else if (ecb_expect_false (!e))
		722	{
		723	if (ecb_expect_true (!m))
		724	/* zero, handled by code below by forcing e to 0 */
		725	e = 0 - (127 - 15);
		726	else
		727	{
		728	/* subnormal, renormalise */
		729	unsigned int s = 10 - ecb_ld32 (m);
		730
		731	m = (m << s) & 0x3ff; /* mask implicit bit */
		732	e -= s - 1;
		733	}
		734	}
		735
		736	/* e and m now are normalised, or zero, (or inf or nan) */
		737	e += 127 - 15;
		738
		739	return s \| (e << 23) \| (m << (23 - 10));
		740	}
		741
		742	ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
		743	ecb_function_ ecb_const uint16_t
		744	ecb_binary32_to_binary16 (uint32_t x)
		745	{
		746	unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
		747	unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
		748	unsigned int m = x & 0x007fffff;
		749
		750	x &= 0x7fffffff;
		751
		752	/* if it's within range of binary16 normals, use fast path */
		753	if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
		754	{
		755	/* mantissa round-to-even */
		756	m += 0x00000fff + ((m >> (23 - 10)) & 1);
		757
		758	/* handle overflow */
		759	if (ecb_expect_false (m >= 0x00800000))
		760	{
		761	m >>= 1;
		762	e += 1;
		763	}
		764
		765	return s \| (e << 10) \| (m >> (23 - 10));
		766	}
		767
		768	/* handle large numbers and infinity */
		769	if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
		770	return s \| 0x7c00;
		771
		772	/* handle zero, subnormals and small numbers */
		773	if (ecb_expect_true (x < 0x38800000))
		774	{
		775	/* zero */
		776	if (ecb_expect_true (!x))
		777	return s;
		778
		779	/* handle subnormals */
		780
		781	/* too small, will be zero */
		782	if (e < (14 - 24)) /* might not be sharp, but is good enough */
		783	return s;
		784
		785	m \|= 0x00800000; /* make implicit bit explicit */
		786
		787	/* very tricky - we need to round to the nearest e (+10) bit value */
		788	{
		789	unsigned int bits = 14 - e;
		790	unsigned int half = (1 << (bits - 1)) - 1;
		791	unsigned int even = (m >> bits) & 1;
		792
		793	/* if this overflows, we will end up with a normalised number */
		794	m = (m + half + even) >> bits;
		795	}
		796
		797	return s \| m;
		798	}
		799
		800	/* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
		801	m >>= 13;
		802
		803	return s \| 0x7c00 \| m \| !m;
		804	}
		805
		806	/*******************************************************************************/
		807	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
		808
		809	/* basically, everything uses "ieee pure-endian" floating point numbers */
		810	/* the only noteworthy exception is ancient armle, which uses order 43218765 */
		811	#if 0 \
		812	\|\| __i386 \|\| __i386__ \
		813	\|\| ECB_GCC_AMD64 \
		814	\|\| __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__ \
		815	\|\| defined __s390__ \|\| defined __s390x__ \
		816	\|\| defined __mips__ \
		817	\|\| defined __alpha__ \
		818	\|\| defined __hppa__ \
		819	\|\| defined __ia64__ \
		820	\|\| defined __m68k__ \
		821	\|\| defined __m88k__ \
		822	\|\| defined __sh__ \
		823	\|\| defined _M_IX86 \|\| defined ECB_MSVC_AMD64 \|\| defined _M_IA64 \
		824	\|\| (defined __arm__ && (defined __ARM_EABI__ \|\| defined __EABI__ \|\| defined __VFP_FP__ \|\| defined _WIN32_WCE \|\| defined __ANDROID__)) \
		825	\|\| defined __aarch64__
		826	#define ECB_STDFP 1
		827	#include <string.h> /* for memcpy */
		828	#else
		829	#define ECB_STDFP 0
		830	#endif
		831
		832	#ifndef ECB_NO_LIBM
		833
		834	#include <math.h> /* for frexp, ldexp, INFINITY, NAN */
		835
		836	/* only the oldest of old doesn't have this one. solaris. */
		837	#ifdef INFINITY
		838	#define ECB_INFINITY INFINITY
		839	#else
		840	#define ECB_INFINITY HUGE_VAL
369	#endif	841	#endif
370		842
		843	#ifdef NAN
		844	#define ECB_NAN NAN
		845	#else
		846	#define ECB_NAN ECB_INFINITY
		847	#endif
		848
		849	#if ECB_C99 \|\| _XOPEN_VERSION >= 600 \|\| _POSIX_VERSION >= 200112L
		850	#define ecb_ldexpf(x,e) ldexpf ((x), (e))
		851	#define ecb_frexpf(x,e) frexpf ((x), (e))
		852	#else
		853	#define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
		854	#define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
		855	#endif
		856
		857	/* convert a float to ieee single/binary32 */
		858	ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
		859	ecb_function_ ecb_const uint32_t
		860	ecb_float_to_binary32 (float x)
		861	{
		862	uint32_t r;
		863
		864	#if ECB_STDFP
		865	memcpy (&r, &x, 4);
		866	#else
		867	/* slow emulation, works for anything but -0 */
		868	uint32_t m;
		869	int e;
		870
		871	if (x == 0e0f ) return 0x00000000U;
		872	if (x > +3.40282346638528860e+38f) return 0x7f800000U;
		873	if (x < -3.40282346638528860e+38f) return 0xff800000U;
		874	if (x != x ) return 0x7fbfffffU;
		875
		876	m = ecb_frexpf (x, &e) * 0x1000000U;
		877
		878	r = m & 0x80000000U;
		879
		880	if (r)
		881	m = -m;
		882
		883	if (e <= -126)
		884	{
		885	m &= 0xffffffU;
		886	m >>= (-125 - e);
		887	e = -126;
		888	}
		889
		890	r \|= (e + 126) << 23;
		891	r \|= m & 0x7fffffU;
		892	#endif
		893
		894	return r;
		895	}
		896
		897	/* converts an ieee single/binary32 to a float */
		898	ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
		899	ecb_function_ ecb_const float
		900	ecb_binary32_to_float (uint32_t x)
		901	{
		902	float r;
		903
		904	#if ECB_STDFP
		905	memcpy (&r, &x, 4);
		906	#else
		907	/* emulation, only works for normals and subnormals and +0 */
		908	int neg = x >> 31;
		909	int e = (x >> 23) & 0xffU;
		910
		911	x &= 0x7fffffU;
		912
		913	if (e)
		914	x \|= 0x800000U;
		915	else
		916	e = 1;
		917
		918	/* we distrust ldexpf a bit and do the 2*-24 scaling by an extra multiply /
		919	r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
		920
		921	r = neg ? -r : r;
		922	#endif
		923
		924	return r;
		925	}
		926
		927	/* convert a double to ieee double/binary64 */
		928	ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
		929	ecb_function_ ecb_const uint64_t
		930	ecb_double_to_binary64 (double x)
		931	{
		932	uint64_t r;
		933
		934	#if ECB_STDFP
		935	memcpy (&r, &x, 8);
		936	#else
		937	/* slow emulation, works for anything but -0 */
		938	uint64_t m;
		939	int e;
		940
		941	if (x == 0e0 ) return 0x0000000000000000U;
		942	if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
		943	if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
		944	if (x != x ) return 0X7ff7ffffffffffffU;
		945
		946	m = frexp (x, &e) * 0x20000000000000U;
		947
		948	r = m & 0x8000000000000000;;
		949
		950	if (r)
		951	m = -m;
		952
		953	if (e <= -1022)
		954	{
		955	m &= 0x1fffffffffffffU;
		956	m >>= (-1021 - e);
		957	e = -1022;
		958	}
		959
		960	r \|= ((uint64_t)(e + 1022)) << 52;
		961	r \|= m & 0xfffffffffffffU;
		962	#endif
		963
		964	return r;
		965	}
		966
		967	/* converts an ieee double/binary64 to a double */
		968	ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
		969	ecb_function_ ecb_const double
		970	ecb_binary64_to_double (uint64_t x)
		971	{
		972	double r;
		973
		974	#if ECB_STDFP
		975	memcpy (&r, &x, 8);
		976	#else
		977	/* emulation, only works for normals and subnormals and +0 */
		978	int neg = x >> 63;
		979	int e = (x >> 52) & 0x7ffU;
		980
		981	x &= 0xfffffffffffffU;
		982
		983	if (e)
		984	x \|= 0x10000000000000U;
		985	else
		986	e = 1;
		987
		988	/* we distrust ldexp a bit and do the 2*-53 scaling by an extra multiply /
		989	r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
		990
		991	r = neg ? -r : r;
		992	#endif
		993
		994	return r;
		995	}
		996
		997	/* convert a float to ieee half/binary16 */
		998	ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
		999	ecb_function_ ecb_const uint16_t
		1000	ecb_float_to_binary16 (float x)
		1001	{
		1002	return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
		1003	}
		1004
		1005	/* convert an ieee half/binary16 to float */
		1006	ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
		1007	ecb_function_ ecb_const float
		1008	ecb_binary16_to_float (uint16_t x)
		1009	{
		1010	return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
		1011	}
		1012
		1013	#endif
		1014
		1015	#endif
		1016

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Comparing libeio/ecb.h (file contents): Revision 1.7 by root, Wed Aug 3 15:25:38 2011 UTC vs. Revision 1.29 by root, Fri Aug 23 07:20:21 2019 UTC

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Comparing libeio/ecb.h (file contents):
Revision 1.7 by root, Wed Aug 3 15:25:38 2011 UTC vs.
Revision 1.29 by root, Fri Aug 23 07:20:21 2019 UTC