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

Comparing libeio/ecb.h (file contents):
Revision 1.10 by root, Mon Sep 26 16:54:25 2011 UTC vs.
Revision 1.31 by root, Thu Sep 3 17:20:45 2020 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 (©) 2009-2015,2018-2020 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	#ifdef _WIN32	44	/* 16 bits major, 16 bits minor */
		45	#define ECB_VERSION 0x00010008
		46
		47	#include <string.h> /* for memcpy */
		48
		49	#if defined (_WIN32) && !defined (__MINGW32__)
34	typedef signed char int8_t;	50	typedef signed char int8_t;
35	typedef unsigned char uint8_t;	51	typedef unsigned char uint8_t;
		52	typedef signed char int_fast8_t;
		53	typedef unsigned char uint_fast8_t;
36	typedef signed short int16_t;	54	typedef signed short int16_t;
37	typedef unsigned short uint16_t;	55	typedef unsigned short uint16_t;
		56	typedef signed int int_fast16_t;
		57	typedef unsigned int uint_fast16_t;
38	typedef signed int int32_t;	58	typedef signed int int32_t;
39	typedef unsigned int uint32_t;	59	typedef unsigned int uint32_t;
		60	typedef signed int int_fast32_t;
		61	typedef unsigned int uint_fast32_t;
40	#if __GNUC__	62	#if __GNUC__
41	typedef signed long long int64_t;	63	typedef signed long long int64_t;
42	typedef unsigned long long uint64_t;	64	typedef unsigned long long uint64_t;
43	#else /* _MSC_VER \|\| __BORLANDC__ */	65	#else /* _MSC_VER \|\| __BORLANDC__ */
44	typedef signed __int64 int64_t;	66	typedef signed __int64 int64_t;
45	typedef unsigned __int64 uint64_t;	67	typedef unsigned __int64 uint64_t;
46	#endif	68	#endif
		69	typedef int64_t int_fast64_t;
		70	typedef uint64_t uint_fast64_t;
		71	#ifdef _WIN64
		72	#define ECB_PTRSIZE 8
		73	typedef uint64_t uintptr_t;
		74	typedef int64_t intptr_t;
		75	#else
		76	#define ECB_PTRSIZE 4
		77	typedef uint32_t uintptr_t;
		78	typedef int32_t intptr_t;
		79	#endif
47	#else	80	#else
48	#include <inttypes.h>	81	#include <inttypes.h>
		82	#if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
		83	#define ECB_PTRSIZE 8
		84	#else
		85	#define ECB_PTRSIZE 4
		86	#endif
		87	#endif
		88
		89	#define ECB_GCC_AMD64 (__amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__)
		90	#define ECB_MSVC_AMD64 (_M_AMD64 \|\| _M_X64)
		91
		92	#ifndef ECB_OPTIMIZE_SIZE
		93	#if __OPTIMIZE_SIZE__
		94	#define ECB_OPTIMIZE_SIZE 1
		95	#else
		96	#define ECB_OPTIMIZE_SIZE 0
		97	#endif
		98	#endif
		99
		100	/* work around x32 idiocy by defining proper macros */
		101	#if ECB_GCC_AMD64 \|\| ECB_MSVC_AMD64
		102	#if _ILP32
		103	#define ECB_AMD64_X32 1
		104	#else
		105	#define ECB_AMD64 1
		106	#endif
49	#endif	107	#endif
50		108
51	/* many compilers define _GNUC_ to some versions but then only implement	109	/* many compilers define _GNUC_ to some versions but then only implement
52	* what their idiot authors think are the "more important" extensions,	110	* what their idiot authors think are the "more important" extensions,
53	* causing enormous grief in return for some better fake benchmark numbers.	111	* causing enormous grief in return for some better fake benchmark numbers.
54	* or so.	112	* or so.
55	* we try to detect these and simply assume they are not gcc - if they have	113	* 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.	114	* an issue with that they should have done it right in the first place.
57	*/	115	*/
58	#ifndef ECB_GCC_VERSION
59	#if !defined(__GNUC_MINOR__) \|\| defined(__INTEL_COMPILER) \|\| defined(__SUNPRO_C) \|\| defined(__SUNPRO_CC) \|\| defined(__llvm__) \|\| defined(__clang__)	116	#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	117	#define ECB_GCC_VERSION(major,minor) 0
61	#else	118	#else
62	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))	119	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
63	#endif	120	#endif
		121
		122	#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) \|\| (__clang_major__ == (major) && __clang_minor__ >= (minor)))
		123
		124	#if __clang__ && defined __has_builtin
		125	#define ECB_CLANG_BUILTIN(x) __has_builtin (x)
		126	#else
		127	#define ECB_CLANG_BUILTIN(x) 0
		128	#endif
		129
		130	#if __clang__ && defined __has_extension
		131	#define ECB_CLANG_EXTENSION(x) __has_extension (x)
		132	#else
		133	#define ECB_CLANG_EXTENSION(x) 0
		134	#endif
		135
		136	#define ECB_CPP (__cplusplus+0)
		137	#define ECB_CPP11 (__cplusplus >= 201103L)
		138	#define ECB_CPP14 (__cplusplus >= 201402L)
		139	#define ECB_CPP17 (__cplusplus >= 201703L)
		140
		141	#if ECB_CPP
		142	#define ECB_C 0
		143	#define ECB_STDC_VERSION 0
		144	#else
		145	#define ECB_C 1
		146	#define ECB_STDC_VERSION __STDC_VERSION__
		147	#endif
		148
		149	#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
		150	#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
		151	#define ECB_C17 (ECB_STDC_VERSION >= 201710L)
		152
		153	#if ECB_CPP
		154	#define ECB_EXTERN_C extern "C"
		155	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {
		156	#define ECB_EXTERN_C_END }
		157	#else
		158	#define ECB_EXTERN_C extern
		159	#define ECB_EXTERN_C_BEG
		160	#define ECB_EXTERN_C_END
64	#endif	161	#endif
65		162
66	/*****************************************************************************/	163	/*****************************************************************************/
67		164
68	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */	165	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
69	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */	166	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
70		167
71	#if ECB_NO_THREADS \|\| ECB_NO_SMP	168	#if ECB_NO_THREADS
		169	#define ECB_NO_SMP 1
		170	#endif
		171
		172	#if ECB_NO_SMP
72	#define ECB_MEMORY_FENCE do { } while (0)	173	#define ECB_MEMORY_FENCE do { } while (0)
73	#endif	174	#endif
74		175
		176	/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
		177	#if __xlC__ && ECB_CPP
		178	#include <builtins.h>
		179	#endif
		180
		181	#if 1400 <= _MSC_VER
		182	#include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
		183	#endif
		184
75	#ifndef ECB_MEMORY_FENCE	185	#ifndef ECB_MEMORY_FENCE
76	#if ECB_GCC_VERSION(2,5) \|\| defined(__INTEL_COMPILER) \|\| defined(__clang__)	186	#if ECB_GCC_VERSION(2,5) \|\| defined __INTEL_COMPILER \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		187	#define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory")
77	#if __i386__	188	#if __i386 \|\| __i386__
78	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")	189	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
79	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */	190	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
80	#define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */	191	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
81	#elif __amd64	192	#elif ECB_GCC_AMD64
82	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")	193	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
83	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")	194	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
84	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */	195	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
85	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__	196	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__
86	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")	197	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		198	#elif defined __ARM_ARCH_2__ \
		199	\|\| defined __ARM_ARCH_3__ \|\| defined __ARM_ARCH_3M__ \
		200	\|\| defined __ARM_ARCH_4__ \|\| defined __ARM_ARCH_4T__ \
		201	\|\| defined __ARM_ARCH_5__ \|\| defined __ARM_ARCH_5E__ \
		202	\|\| defined __ARM_ARCH_5T__ \|\| defined __ARM_ARCH_5TE__ \
		203	\|\| defined __ARM_ARCH_5TEJ__
		204	/* should not need any, unless running old code on newer cpu - arm doesn't support that */
87	#elif defined(__ARM_ARCH_6__ ) \|\| defined(__ARM_ARCH_6J__ ) \	205	#elif defined __ARM_ARCH_6__ \|\| defined __ARM_ARCH_6J__ \
88	\|\| defined(__ARM_ARCH_6K__) \|\| defined(__ARM_ARCH_6ZK__)	206	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__ \
		207	\|\| defined __ARM_ARCH_6T2__
89	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")	208	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
90	#elif defined(__ARM_ARCH_7__ ) \|\| defined(__ARM_ARCH_7A__ ) \	209	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \
91	\|\| defined(__ARM_ARCH_7M__) \|\| defined(__ARM_ARCH_7R__ )	210	\|\| defined __ARM_ARCH_7R__ \|\| defined __ARM_ARCH_7M__
92	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")	211	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
		212	#elif __aarch64__
		213	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
		214	#elif (__sparc \|\| __sparc__) && !(__sparc_v8__ \|\| defined __sparcv8)
		215	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad" : : : "memory")
		216	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
		217	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
		218	#elif defined __s390__ \|\| defined __s390x__
		219	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
		220	#elif defined __mips__
		221	/* GNU/Linux emulates sync on mips1 architectures, so we force its use */
		222	/* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
		223	#define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
		224	#elif defined __alpha__
		225	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
		226	#elif defined __hppa__
		227	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		228	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		229	#elif defined __ia64__
		230	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
		231	#elif defined __m68k__
		232	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		233	#elif defined __m88k__
		234	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
		235	#elif defined __sh__
		236	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
93	#endif	237	#endif
94	#endif	238	#endif
95	#endif	239	#endif
96		240
97	#ifndef ECB_MEMORY_FENCE	241	#ifndef ECB_MEMORY_FENCE
		242	#if ECB_GCC_VERSION(4,7)
		243	/* see comment below (stdatomic.h) about the C11 memory model. */
		244	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
		245	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
		246	#define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
		247	#define ECB_MEMORY_FENCE_RELAXED __atomic_thread_fence (__ATOMIC_RELAXED)
		248
		249	#elif ECB_CLANG_EXTENSION(c_atomic)
		250	/* see comment below (stdatomic.h) about the C11 memory model. */
		251	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
		252	#define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
		253	#define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
		254	#define ECB_MEMORY_FENCE_RELAXED __c11_atomic_thread_fence (__ATOMIC_RELAXED)
		255
98	#if ECB_GCC_VERSION(4,4) \|\| defined(__INTEL_COMPILER) \|\| defined(__clang__)	256	#elif ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__
99	#define ECB_MEMORY_FENCE __sync_synchronize ()	257	#define ECB_MEMORY_FENCE __sync_synchronize ()
100	/#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) /	258	#elif _MSC_VER >= 1500 /* VC++ 2008 */
101	/#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) /	259	/* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
		260	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		261	#define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
		262	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
		263	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
102	#elif _MSC_VER >= 1400 /* VC++ 2005 */	264	#elif _MSC_VER >= 1400 /* VC++ 2005 */
103	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)	265	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
104	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()	266	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
105	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */	267	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
106	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()	268	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
107	#elif defined(_WIN32)	269	#elif defined _WIN32
108	#include <WinNT.h>	270	#include <WinNT.h>
109	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */	271	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
		272	#elif __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		273	#include <mbarrier.h>
		274	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
		275	#define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier ()
		276	#define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier ()
		277	#define ECB_MEMORY_FENCE_RELAXED __compiler_barrier ()
		278	#elif __xlC__
		279	#define ECB_MEMORY_FENCE __sync ()
		280	#endif
		281	#endif
		282
		283	#ifndef ECB_MEMORY_FENCE
		284	#if ECB_C11 && !defined __STDC_NO_ATOMICS__
		285	/* we assume that these memory fences work on all variables/all memory accesses, */
		286	/* not just C11 atomics and atomic accesses */
		287	#include <stdatomic.h>
		288	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
		289	#define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
		290	#define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
110	#endif	291	#endif
111	#endif	292	#endif
112		293
113	#ifndef ECB_MEMORY_FENCE	294	#ifndef ECB_MEMORY_FENCE
114	#if !ECB_AVOID_PTHREADS	295	#if !ECB_AVOID_PTHREADS
…		…
126	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;	307	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
127	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)	308	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
128	#endif	309	#endif
129	#endif	310	#endif
130		311
131	#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)	312	#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
132	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE	313	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
133	#endif	314	#endif
134		315
135	#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)	316	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
136	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE	317	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
137	#endif	318	#endif
138		319
		320	#if !defined ECB_MEMORY_FENCE_RELAXED && defined ECB_MEMORY_FENCE
		321	#define ECB_MEMORY_FENCE_RELAXED ECB_MEMORY_FENCE /* very heavy-handed */
		322	#endif
		323
139	/*****************************************************************************/	324	/*****************************************************************************/
140		325
141	#define ECB_C99 (__STDC_VERSION__ >= 199901L)	326	#if ECB_CPP
142
143	#if __cplusplus
144	#define ecb_inline static inline	327	#define ecb_inline static inline
145	#elif ECB_GCC_VERSION(2,5)	328	#elif ECB_GCC_VERSION(2,5)
146	#define ecb_inline static __inline__	329	#define ecb_inline static __inline__
147	#elif ECB_C99	330	#elif ECB_C99
148	#define ecb_inline static inline	331	#define ecb_inline static inline
…		…
162		345
163	#define ECB_CONCAT_(a, b) a ## b	346	#define ECB_CONCAT_(a, b) a ## b
164	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	347	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
165	#define ECB_STRINGIFY_(a) # a	348	#define ECB_STRINGIFY_(a) # a
166	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)	349	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
		350	#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
167		351
168	#define ecb_function_ ecb_inline	352	#define ecb_function_ ecb_inline
169		353
170	#if ECB_GCC_VERSION(3,1)	354	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_VERSION(2,8)
171	#define ecb_attribute(attrlist) __attribute__(attrlist)	355	#define ecb_attribute(attrlist) __attribute__ (attrlist)
		356	#else
		357	#define ecb_attribute(attrlist)
		358	#endif
		359
		360	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_constant_p)
172	#define ecb_is_constant(expr) __builtin_constant_p (expr)	361	#define ecb_is_constant(expr) __builtin_constant_p (expr)
		362	#else
		363	/* possible C11 impl for integral types
		364	typedef struct ecb_is_constant_struct ecb_is_constant_struct;
		365	#define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct )0 : (void )((expr) - (expr)), ecb_is_constant_struct : 0, default: 1)) /
		366
		367	#define ecb_is_constant(expr) 0
		368	#endif
		369
		370	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_expect)
173	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))	371	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
		372	#else
		373	#define ecb_expect(expr,value) (expr)
		374	#endif
		375
		376	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_prefetch)
174	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)	377	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
175	#else	378	#else
176	#define ecb_attribute(attrlist)
177	#define ecb_is_constant(expr) 0
178	#define ecb_expect(expr,value) (expr)
179	#define ecb_prefetch(addr,rw,locality)	379	#define ecb_prefetch(addr,rw,locality)
180	#endif	380	#endif
181		381
182	/* no emulation for ecb_decltype */	382	/* no emulation for ecb_decltype */
183	#if ECB_GCC_VERSION(4,5)	383	#if ECB_CPP11
		384	// older implementations might have problems with decltype(x)::type, work around it
		385	template<class T> struct ecb_decltype_t { typedef T type; };
184	#define ecb_decltype(x) __decltype(x)	386	#define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
185	#elif ECB_GCC_VERSION(3,0)	387	#elif ECB_GCC_VERSION(3,0) \|\| ECB_CLANG_VERSION(2,8)
186	#define ecb_decltype(x) __typeof(x)	388	#define ecb_decltype(x) __typeof__ (x)
187	#endif	389	#endif
188		390
		391	#if _MSC_VER >= 1300
		392	#define ecb_deprecated __declspec (deprecated)
		393	#else
		394	#define ecb_deprecated ecb_attribute ((__deprecated__))
		395	#endif
		396
		397	#if _MSC_VER >= 1500
		398	#define ecb_deprecated_message(msg) __declspec (deprecated (msg))
		399	#elif ECB_GCC_VERSION(4,5)
		400	#define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
		401	#else
		402	#define ecb_deprecated_message(msg) ecb_deprecated
		403	#endif
		404
		405	#if _MSC_VER >= 1400
		406	#define ecb_noinline __declspec (noinline)
		407	#else
189	#define ecb_noinline ecb_attribute ((__noinline__))	408	#define ecb_noinline ecb_attribute ((__noinline__))
190	#define ecb_noreturn ecb_attribute ((__noreturn__))	409	#endif
		410
191	#define ecb_unused ecb_attribute ((__unused__))	411	#define ecb_unused ecb_attribute ((__unused__))
192	#define ecb_const ecb_attribute ((__const__))	412	#define ecb_const ecb_attribute ((__const__))
193	#define ecb_pure ecb_attribute ((__pure__))	413	#define ecb_pure ecb_attribute ((__pure__))
		414
		415	#if ECB_C11 \|\| __IBMC_NORETURN
		416	/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
		417	#define ecb_noreturn _Noreturn
		418	#elif ECB_CPP11
		419	#define ecb_noreturn [[noreturn]]
		420	#elif _MSC_VER >= 1200
		421	/* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
		422	#define ecb_noreturn __declspec (noreturn)
		423	#else
		424	#define ecb_noreturn ecb_attribute ((__noreturn__))
		425	#endif
194		426
195	#if ECB_GCC_VERSION(4,3)	427	#if ECB_GCC_VERSION(4,3)
196	#define ecb_artificial ecb_attribute ((__artificial__))	428	#define ecb_artificial ecb_attribute ((__artificial__))
197	#define ecb_hot ecb_attribute ((__hot__))	429	#define ecb_hot ecb_attribute ((__hot__))
198	#define ecb_cold ecb_attribute ((__cold__))	430	#define ecb_cold ecb_attribute ((__cold__))
…		…
210	/* for compatibility to the rest of the world */	442	/* for compatibility to the rest of the world */
211	#define ecb_likely(expr) ecb_expect_true (expr)	443	#define ecb_likely(expr) ecb_expect_true (expr)
212	#define ecb_unlikely(expr) ecb_expect_false (expr)	444	#define ecb_unlikely(expr) ecb_expect_false (expr)
213		445
214	/* count trailing zero bits and count # of one bits */	446	/* count trailing zero bits and count # of one bits */
215	#if ECB_GCC_VERSION(3,4)	447	#if ECB_GCC_VERSION(3,4) \
		448	\|\| (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
		449	&& ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
		450	&& ECB_CLANG_BUILTIN(__builtin_popcount))
216	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */	451	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
217	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)	452	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
218	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)	453	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
219	#define ecb_ctz32(x) __builtin_ctz (x)	454	#define ecb_ctz32(x) __builtin_ctz (x)
220	#define ecb_ctz64(x) __builtin_ctzll (x)	455	#define ecb_ctz64(x) __builtin_ctzll (x)
221	#define ecb_popcount32(x) __builtin_popcount (x)	456	#define ecb_popcount32(x) __builtin_popcount (x)
222	/* no popcountll */	457	/* no popcountll */
223	#else	458	#else
224	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;	459	ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
225	ecb_function_ int	460	ecb_function_ ecb_const int
226	ecb_ctz32 (uint32_t x)	461	ecb_ctz32 (uint32_t x)
227	{	462	{
		463	#if 1400 <= _MSC_VER && (_M_IX86 \|\| _M_X64 \|\| _M_IA64 \|\| _M_ARM)
		464	unsigned long r;
		465	_BitScanForward (&r, x);
		466	return (int)r;
		467	#else
228	int r = 0;	468	int r = 0;
229		469
230	x &= ~x + 1; /* this isolates the lowest bit */	470	x &= ~x + 1; /* this isolates the lowest bit */
231		471
232	#if ECB_branchless_on_i386	472	#if ECB_branchless_on_i386
…		…
242	if (x & 0xff00ff00) r += 8;	482	if (x & 0xff00ff00) r += 8;
243	if (x & 0xffff0000) r += 16;	483	if (x & 0xffff0000) r += 16;
244	#endif	484	#endif
245		485
246	return r;	486	return r;
		487	#endif
247	}	488	}
248		489
249	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;	490	ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
250	ecb_function_ int	491	ecb_function_ ecb_const int
251	ecb_ctz64 (uint64_t x)	492	ecb_ctz64 (uint64_t x)
252	{	493	{
		494	#if 1400 <= _MSC_VER && (_M_X64 \|\| _M_IA64 \|\| _M_ARM)
		495	unsigned long r;
		496	_BitScanForward64 (&r, x);
		497	return (int)r;
		498	#else
253	int shift = x & 0xffffffffU ? 0 : 32;	499	int shift = x & 0xffffffff ? 0 : 32;
254	return ecb_ctz32 (x >> shift) + shift;	500	return ecb_ctz32 (x >> shift) + shift;
		501	#endif
255	}	502	}
256		503
257	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;	504	ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
258	ecb_function_ int	505	ecb_function_ ecb_const int
259	ecb_popcount32 (uint32_t x)	506	ecb_popcount32 (uint32_t x)
260	{	507	{
261	x -= (x >> 1) & 0x55555555;	508	x -= (x >> 1) & 0x55555555;
262	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);	509	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
263	x = ((x >> 4) + x) & 0x0f0f0f0f;	510	x = ((x >> 4) + x) & 0x0f0f0f0f;
264	x *= 0x01010101;	511	x *= 0x01010101;
265		512
266	return x >> 24;	513	return x >> 24;
267	}	514	}
268		515
269	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;	516	ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
270	ecb_function_ int ecb_ld32 (uint32_t x)	517	ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
271	{	518	{
		519	#if 1400 <= _MSC_VER && (_M_IX86 \|\| _M_X64 \|\| _M_IA64 \|\| _M_ARM)
		520	unsigned long r;
		521	_BitScanReverse (&r, x);
		522	return (int)r;
		523	#else
272	int r = 0;	524	int r = 0;
273		525
274	if (x >> 16) { x >>= 16; r += 16; }	526	if (x >> 16) { x >>= 16; r += 16; }
275	if (x >> 8) { x >>= 8; r += 8; }	527	if (x >> 8) { x >>= 8; r += 8; }
276	if (x >> 4) { x >>= 4; r += 4; }	528	if (x >> 4) { x >>= 4; r += 4; }
277	if (x >> 2) { x >>= 2; r += 2; }	529	if (x >> 2) { x >>= 2; r += 2; }
278	if (x >> 1) { r += 1; }	530	if (x >> 1) { r += 1; }
279		531
280	return r;	532	return r;
		533	#endif
281	}	534	}
282		535
283	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;	536	ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
284	ecb_function_ int ecb_ld64 (uint64_t x)	537	ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
285	{	538	{
		539	#if 1400 <= _MSC_VER && (_M_X64 \|\| _M_IA64 \|\| _M_ARM)
		540	unsigned long r;
		541	_BitScanReverse64 (&r, x);
		542	return (int)r;
		543	#else
286	int r = 0;	544	int r = 0;
287		545
288	if (x >> 32) { x >>= 32; r += 32; }	546	if (x >> 32) { x >>= 32; r += 32; }
289		547
290	return r + ecb_ld32 (x);	548	return r + ecb_ld32 (x);
291	}
292	#endif	549	#endif
		550	}
		551	#endif
		552
		553	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
		554	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
		555	ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
		556	ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
		557
		558	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
		559	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
		560	{
		561	return ( (x * 0x0802U & 0x22110U)
		562	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
		563	}
		564
		565	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
		566	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
		567	{
		568	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);
		569	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);
		570	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);
		571	x = ( x >> 8 ) \| ( x << 8);
		572
		573	return x;
		574	}
		575
		576	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
		577	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
		578	{
		579	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);
		580	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);
		581	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);
		582	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);
		583	x = ( x >> 16 ) \| ( x << 16);
		584
		585	return x;
		586	}
293		587
294	/* popcount64 is only available on 64 bit cpus as gcc builtin */	588	/* popcount64 is only available on 64 bit cpus as gcc builtin */
295	/* so for this version we are lazy */	589	/* so for this version we are lazy */
296	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;	590	ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
297	ecb_function_ int	591	ecb_function_ ecb_const int
298	ecb_popcount64 (uint64_t x)	592	ecb_popcount64 (uint64_t x)
299	{	593	{
300	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);	594	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
301	}	595	}
302		596
303	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;	597	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
304	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;	598	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
305	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;	599	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
306	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;	600	ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
307	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;	601	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
308	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;	602	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
309	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;	603	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
310	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;	604	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
311		605
312	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }	606	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }
313	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }	607	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }
314	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }	608	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }
315	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }	609	ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }
316	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }	610	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }
317	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }	611	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }
318	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }	612	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }
319	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }	613	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }
320		614
321	#if ECB_GCC_VERSION(4,3)	615	#if ECB_CPP
		616
		617	inline uint8_t ecb_ctz (uint8_t v) { return ecb_ctz32 (v); }
		618	inline uint16_t ecb_ctz (uint16_t v) { return ecb_ctz32 (v); }
		619	inline uint32_t ecb_ctz (uint32_t v) { return ecb_ctz32 (v); }
		620	inline uint64_t ecb_ctz (uint64_t v) { return ecb_ctz64 (v); }
		621
		622	inline bool ecb_is_pot (uint8_t v) { return ecb_is_pot32 (v); }
		623	inline bool ecb_is_pot (uint16_t v) { return ecb_is_pot32 (v); }
		624	inline bool ecb_is_pot (uint32_t v) { return ecb_is_pot32 (v); }
		625	inline bool ecb_is_pot (uint64_t v) { return ecb_is_pot64 (v); }
		626
		627	inline int ecb_ld (uint8_t v) { return ecb_ld32 (v); }
		628	inline int ecb_ld (uint16_t v) { return ecb_ld32 (v); }
		629	inline int ecb_ld (uint32_t v) { return ecb_ld32 (v); }
		630	inline int ecb_ld (uint64_t v) { return ecb_ld64 (v); }
		631
		632	inline int ecb_popcount (uint8_t v) { return ecb_popcount32 (v); }
		633	inline int ecb_popcount (uint16_t v) { return ecb_popcount32 (v); }
		634	inline int ecb_popcount (uint32_t v) { return ecb_popcount32 (v); }
		635	inline int ecb_popcount (uint64_t v) { return ecb_popcount64 (v); }
		636
		637	inline uint8_t ecb_bitrev (uint8_t v) { return ecb_bitrev8 (v); }
		638	inline uint16_t ecb_bitrev (uint16_t v) { return ecb_bitrev16 (v); }
		639	inline uint32_t ecb_bitrev (uint32_t v) { return ecb_bitrev32 (v); }
		640
		641	inline uint8_t ecb_rotl (uint8_t v, unsigned int count) { return ecb_rotl8 (v, count); }
		642	inline uint16_t ecb_rotl (uint16_t v, unsigned int count) { return ecb_rotl16 (v, count); }
		643	inline uint32_t ecb_rotl (uint32_t v, unsigned int count) { return ecb_rotl32 (v, count); }
		644	inline uint64_t ecb_rotl (uint64_t v, unsigned int count) { return ecb_rotl64 (v, count); }
		645
		646	inline uint8_t ecb_rotr (uint8_t v, unsigned int count) { return ecb_rotr8 (v, count); }
		647	inline uint16_t ecb_rotr (uint16_t v, unsigned int count) { return ecb_rotr16 (v, count); }
		648	inline uint32_t ecb_rotr (uint32_t v, unsigned int count) { return ecb_rotr32 (v, count); }
		649	inline uint64_t ecb_rotr (uint64_t v, unsigned int count) { return ecb_rotr64 (v, count); }
		650
		651	#endif
		652
		653	#if ECB_GCC_VERSION(4,3) \|\| (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
		654	#if ECB_GCC_VERSION(4,8) \|\| ECB_CLANG_BUILTIN(__builtin_bswap16)
		655	#define ecb_bswap16(x) __builtin_bswap16 (x)
		656	#else
322	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)	657	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
		658	#endif
323	#define ecb_bswap32(x) __builtin_bswap32 (x)	659	#define ecb_bswap32(x) __builtin_bswap32 (x)
324	#define ecb_bswap64(x) __builtin_bswap64 (x)	660	#define ecb_bswap64(x) __builtin_bswap64 (x)
		661	#elif _MSC_VER
		662	#include <stdlib.h>
		663	#define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
		664	#define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
		665	#define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
325	#else	666	#else
326	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;	667	ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
327	ecb_function_ uint16_t	668	ecb_function_ ecb_const uint16_t
328	ecb_bswap16 (uint16_t x)	669	ecb_bswap16 (uint16_t x)
329	{	670	{
330	return ecb_rotl16 (x, 8);	671	return ecb_rotl16 (x, 8);
331	}	672	}
332		673
333	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;	674	ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
334	ecb_function_ uint32_t	675	ecb_function_ ecb_const uint32_t
335	ecb_bswap32 (uint32_t x)	676	ecb_bswap32 (uint32_t x)
336	{	677	{
337	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);	678	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);
338	}	679	}
339		680
340	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;	681	ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
341	ecb_function_ uint64_t	682	ecb_function_ ecb_const uint64_t
342	ecb_bswap64 (uint64_t x)	683	ecb_bswap64 (uint64_t x)
343	{	684	{
344	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);	685	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);
345	}	686	}
346	#endif	687	#endif
347		688
348	#if ECB_GCC_VERSION(4,5)	689	#if ECB_GCC_VERSION(4,5) \|\| ECB_CLANG_BUILTIN(__builtin_unreachable)
349	#define ecb_unreachable() __builtin_unreachable ()	690	#define ecb_unreachable() __builtin_unreachable ()
350	#else	691	#else
351	/* this seems to work fine, but gcc always emits a warning for it :/ */	692	/* this seems to work fine, but gcc always emits a warning for it :/ */
352	ecb_function_ void ecb_unreachable (void) ecb_noreturn;	693	ecb_inline ecb_noreturn void ecb_unreachable (void);
353	ecb_function_ void ecb_unreachable (void) { }	694	ecb_inline ecb_noreturn void ecb_unreachable (void) { }
354	#endif	695	#endif
355		696
356	/* try to tell the compiler that some condition is definitely true */	697	/* try to tell the compiler that some condition is definitely true */
357	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)	698	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
358		699
359	ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;	700	ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
360	ecb_function_ unsigned char	701	ecb_inline ecb_const uint32_t
361	ecb_byteorder_helper (void)	702	ecb_byteorder_helper (void)
362	{	703	{
363	const uint32_t u = 0x11223344;	704	/* the union code still generates code under pressure in gcc, */
364	return (unsigned char )&u;	705	/* but less than using pointers, and always seems to */
		706	/* successfully return a constant. */
		707	/* the reason why we have this horrible preprocessor mess */
		708	/* is to avoid it in all cases, at least on common architectures */
		709	/* or when using a recent enough gcc version (>= 4.6) */
		710	#if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
		711	\|\| ((__i386 \|\| __i386__ \|\| _M_IX86 \|\| ECB_GCC_AMD64 \|\| ECB_MSVC_AMD64) && !__VOS__)
		712	#define ECB_LITTLE_ENDIAN 1
		713	return 0x44332211;
		714	#elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
		715	\|\| ((__AARCH64EB__ \|\| __MIPSEB__ \|\| __ARMEB__) && !__VOS__)
		716	#define ECB_BIG_ENDIAN 1
		717	return 0x11223344;
		718	#else
		719	union
		720	{
		721	uint8_t c[4];
		722	uint32_t u;
		723	} u = { 0x11, 0x22, 0x33, 0x44 };
		724	return u.u;
		725	#endif
365	}	726	}
366		727
367	ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;	728	ecb_inline ecb_const ecb_bool ecb_big_endian (void);
368	ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }	729	ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
369	ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;	730	ecb_inline ecb_const ecb_bool ecb_little_endian (void);
370	ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }	731	ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
		732
		733	/*****************************************************************************/
		734	/* unaligned load/store */
		735
		736	ecb_inline uint_fast16_t ecb_be_u16_to_host (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
		737	ecb_inline uint_fast32_t ecb_be_u32_to_host (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
		738	ecb_inline uint_fast64_t ecb_be_u64_to_host (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
		739
		740	ecb_inline uint_fast16_t ecb_le_u16_to_host (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
		741	ecb_inline uint_fast32_t ecb_le_u32_to_host (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
		742	ecb_inline uint_fast64_t ecb_le_u64_to_host (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
		743
		744	ecb_inline uint_fast16_t ecb_peek_u16_u (const void *ptr) { uint16_t v; memcpy (&v, ptr, sizeof (v)); return v; }
		745	ecb_inline uint_fast32_t ecb_peek_u32_u (const void *ptr) { uint32_t v; memcpy (&v, ptr, sizeof (v)); return v; }
		746	ecb_inline uint_fast64_t ecb_peek_u64_u (const void *ptr) { uint64_t v; memcpy (&v, ptr, sizeof (v)); return v; }
		747
		748	ecb_inline uint_fast16_t ecb_peek_be_u16_u (const void *ptr) { return ecb_be_u16_to_host (ecb_peek_u16_u (ptr)); }
		749	ecb_inline uint_fast32_t ecb_peek_be_u32_u (const void *ptr) { return ecb_be_u32_to_host (ecb_peek_u32_u (ptr)); }
		750	ecb_inline uint_fast64_t ecb_peek_be_u64_u (const void *ptr) { return ecb_be_u64_to_host (ecb_peek_u64_u (ptr)); }
		751
		752	ecb_inline uint_fast16_t ecb_peek_le_u16_u (const void *ptr) { return ecb_le_u16_to_host (ecb_peek_u16_u (ptr)); }
		753	ecb_inline uint_fast32_t ecb_peek_le_u32_u (const void *ptr) { return ecb_le_u32_to_host (ecb_peek_u32_u (ptr)); }
		754	ecb_inline uint_fast64_t ecb_peek_le_u64_u (const void *ptr) { return ecb_le_u64_to_host (ecb_peek_u64_u (ptr)); }
		755
		756	ecb_inline uint_fast16_t ecb_host_to_be_u16 (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
		757	ecb_inline uint_fast32_t ecb_host_to_be_u32 (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
		758	ecb_inline uint_fast64_t ecb_host_to_be_u64 (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
		759
		760	ecb_inline uint_fast16_t ecb_host_to_le_u16 (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
		761	ecb_inline uint_fast32_t ecb_host_to_le_u32 (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
		762	ecb_inline uint_fast64_t ecb_host_to_le_u64 (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
		763
		764	ecb_inline void ecb_poke_u16_u (void *ptr, uint16_t v) { memcpy (ptr, &v, sizeof (v)); }
		765	ecb_inline void ecb_poke_u32_u (void *ptr, uint32_t v) { memcpy (ptr, &v, sizeof (v)); }
		766	ecb_inline void ecb_poke_u64_u (void *ptr, uint64_t v) { memcpy (ptr, &v, sizeof (v)); }
		767
		768	ecb_inline void ecb_poke_be_u16_u (void *ptr, uint_fast16_t v) { ecb_poke_u16_u (ptr, ecb_host_to_be_u16 (v)); }
		769	ecb_inline void ecb_poke_be_u32_u (void *ptr, uint_fast32_t v) { ecb_poke_u32_u (ptr, ecb_host_to_be_u32 (v)); }
		770	ecb_inline void ecb_poke_be_u64_u (void *ptr, uint_fast64_t v) { ecb_poke_u64_u (ptr, ecb_host_to_be_u64 (v)); }
		771
		772	ecb_inline void ecb_poke_le_u16_u (void *ptr, uint_fast16_t v) { ecb_poke_u16_u (ptr, ecb_host_to_le_u16 (v)); }
		773	ecb_inline void ecb_poke_le_u32_u (void *ptr, uint_fast32_t v) { ecb_poke_u32_u (ptr, ecb_host_to_le_u32 (v)); }
		774	ecb_inline void ecb_poke_le_u64_u (void *ptr, uint_fast64_t v) { ecb_poke_u64_u (ptr, ecb_host_to_le_u64 (v)); }
		775
		776	#if ECB_CPP
		777
		778	inline uint8_t ecb_bswap (uint8_t v) { return v; }
		779	inline uint16_t ecb_bswap (uint16_t v) { return ecb_bswap16 (v); }
		780	inline uint32_t ecb_bswap (uint32_t v) { return ecb_bswap32 (v); }
		781	inline uint64_t ecb_bswap (uint64_t v) { return ecb_bswap64 (v); }
		782
		783	template<typename T> inline T ecb_be_to_host (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
		784	template<typename T> inline T ecb_le_to_host (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
		785	template<typename T> inline T ecb_peek (const void ptr) { return (const T *)ptr; }
		786	template<typename T> inline T ecb_peek_be (const void *ptr) { return ecb_be_to_host (ecb_peek <T> (ptr)); }
		787	template<typename T> inline T ecb_peek_le (const void *ptr) { return ecb_le_to_host (ecb_peek <T> (ptr)); }
		788	template<typename T> inline T ecb_peek_u (const void *ptr) { T v; memcpy (&v, ptr, sizeof (v)); return v; }
		789	template<typename T> inline T ecb_peek_be_u (const void *ptr) { return ecb_be_to_host (ecb_peek_u<T> (ptr)); }
		790	template<typename T> inline T ecb_peek_le_u (const void *ptr) { return ecb_le_to_host (ecb_peek_u<T> (ptr)); }
		791
		792	template<typename T> inline T ecb_host_to_be (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
		793	template<typename T> inline T ecb_host_to_le (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
		794	template<typename T> inline void ecb_poke (void ptr, T v) { (T *)ptr = v; }
		795	template<typename T> inline void ecb_poke_be (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_be (v)); }
		796	template<typename T> inline void ecb_poke_le (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_le (v)); }
		797	template<typename T> inline void ecb_poke_u (void *ptr, T v) { memcpy (ptr, &v, sizeof (v)); }
		798	template<typename T> inline void ecb_poke_be_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_be (v)); }
		799	template<typename T> inline void ecb_poke_le_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_le (v)); }
		800
		801	#endif
		802
		803	/*****************************************************************************/
		804	/* division */
371		805
372	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99	806	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
		807	/* C99 tightened the definition of %, so we can use a more efficient version */
373	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))	808	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
374	#else	809	#else
375	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))	810	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
376	#endif	811	#endif
377		812
378	#if __cplusplus	813	#if ECB_CPP
379	template<typename T>	814	template<typename T>
380	static inline T ecb_div_rd (T val, T div)	815	static inline T ecb_div_rd (T val, T div)
381	{	816	{
382	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;	817	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
383	}	818	}
…		…
388	}	823	}
389	#else	824	#else
390	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))	825	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
391	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))	826	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
392	#endif	827	#endif
		828
		829	/*****************************************************************************/
		830	/* array length */
393		831
394	#if ecb_cplusplus_does_not_suck	832	#if ecb_cplusplus_does_not_suck
395	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */	833	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
396	template<typename T, int N>	834	template<typename T, int N>
397	static inline int ecb_array_length (const T (&arr)[N])	835	static inline int ecb_array_length (const T (&arr)[N])
…		…
400	}	838	}
401	#else	839	#else
402	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	840	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
403	#endif	841	#endif
404		842
		843	/*****************************************************************************/
		844	/* IEEE 754-2008 half float conversions */
		845
		846	ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
		847	ecb_function_ ecb_const uint32_t
		848	ecb_binary16_to_binary32 (uint32_t x)
		849	{
		850	unsigned int s = (x & 0x8000) << (31 - 15);
		851	int e = (x >> 10) & 0x001f;
		852	unsigned int m = x & 0x03ff;
		853
		854	if (ecb_expect_false (e == 31))
		855	/* infinity or NaN */
		856	e = 255 - (127 - 15);
		857	else if (ecb_expect_false (!e))
		858	{
		859	if (ecb_expect_true (!m))
		860	/* zero, handled by code below by forcing e to 0 */
		861	e = 0 - (127 - 15);
		862	else
		863	{
		864	/* subnormal, renormalise */
		865	unsigned int s = 10 - ecb_ld32 (m);
		866
		867	m = (m << s) & 0x3ff; /* mask implicit bit */
		868	e -= s - 1;
		869	}
		870	}
		871
		872	/* e and m now are normalised, or zero, (or inf or nan) */
		873	e += 127 - 15;
		874
		875	return s \| (e << 23) \| (m << (23 - 10));
		876	}
		877
		878	ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
		879	ecb_function_ ecb_const uint16_t
		880	ecb_binary32_to_binary16 (uint32_t x)
		881	{
		882	unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
		883	unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
		884	unsigned int m = x & 0x007fffff;
		885
		886	x &= 0x7fffffff;
		887
		888	/* if it's within range of binary16 normals, use fast path */
		889	if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
		890	{
		891	/* mantissa round-to-even */
		892	m += 0x00000fff + ((m >> (23 - 10)) & 1);
		893
		894	/* handle overflow */
		895	if (ecb_expect_false (m >= 0x00800000))
		896	{
		897	m >>= 1;
		898	e += 1;
		899	}
		900
		901	return s \| (e << 10) \| (m >> (23 - 10));
		902	}
		903
		904	/* handle large numbers and infinity */
		905	if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
		906	return s \| 0x7c00;
		907
		908	/* handle zero, subnormals and small numbers */
		909	if (ecb_expect_true (x < 0x38800000))
		910	{
		911	/* zero */
		912	if (ecb_expect_true (!x))
		913	return s;
		914
		915	/* handle subnormals */
		916
		917	/* too small, will be zero */
		918	if (e < (14 - 24)) /* might not be sharp, but is good enough */
		919	return s;
		920
		921	m \|= 0x00800000; /* make implicit bit explicit */
		922
		923	/* very tricky - we need to round to the nearest e (+10) bit value */
		924	{
		925	unsigned int bits = 14 - e;
		926	unsigned int half = (1 << (bits - 1)) - 1;
		927	unsigned int even = (m >> bits) & 1;
		928
		929	/* if this overflows, we will end up with a normalised number */
		930	m = (m + half + even) >> bits;
		931	}
		932
		933	return s \| m;
		934	}
		935
		936	/* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
		937	m >>= 13;
		938
		939	return s \| 0x7c00 \| m \| !m;
		940	}
		941
		942	/*******************************************************************************/
		943	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
		944
		945	/* basically, everything uses "ieee pure-endian" floating point numbers */
		946	/* the only noteworthy exception is ancient armle, which uses order 43218765 */
		947	#if 0 \
		948	\|\| __i386 \|\| __i386__ \
		949	\|\| ECB_GCC_AMD64 \
		950	\|\| __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__ \
		951	\|\| defined __s390__ \|\| defined __s390x__ \
		952	\|\| defined __mips__ \
		953	\|\| defined __alpha__ \
		954	\|\| defined __hppa__ \
		955	\|\| defined __ia64__ \
		956	\|\| defined __m68k__ \
		957	\|\| defined __m88k__ \
		958	\|\| defined __sh__ \
		959	\|\| defined _M_IX86 \|\| defined ECB_MSVC_AMD64 \|\| defined _M_IA64 \
		960	\|\| (defined __arm__ && (defined __ARM_EABI__ \|\| defined __EABI__ \|\| defined __VFP_FP__ \|\| defined _WIN32_WCE \|\| defined __ANDROID__)) \
		961	\|\| defined __aarch64__
		962	#define ECB_STDFP 1
		963	#else
		964	#define ECB_STDFP 0
		965	#endif
		966
		967	#ifndef ECB_NO_LIBM
		968
		969	#include <math.h> /* for frexp, ldexp, INFINITY, NAN */
		970
		971	/* only the oldest of old doesn't have this one. solaris. */
		972	#ifdef INFINITY
		973	#define ECB_INFINITY INFINITY
		974	#else
		975	#define ECB_INFINITY HUGE_VAL
405	#endif	976	#endif
406		977
		978	#ifdef NAN
		979	#define ECB_NAN NAN
		980	#else
		981	#define ECB_NAN ECB_INFINITY
		982	#endif
		983
		984	#if ECB_C99 \|\| _XOPEN_VERSION >= 600 \|\| _POSIX_VERSION >= 200112L
		985	#define ecb_ldexpf(x,e) ldexpf ((x), (e))
		986	#define ecb_frexpf(x,e) frexpf ((x), (e))
		987	#else
		988	#define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
		989	#define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
		990	#endif
		991
		992	/* convert a float to ieee single/binary32 */
		993	ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
		994	ecb_function_ ecb_const uint32_t
		995	ecb_float_to_binary32 (float x)
		996	{
		997	uint32_t r;
		998
		999	#if ECB_STDFP
		1000	memcpy (&r, &x, 4);
		1001	#else
		1002	/* slow emulation, works for anything but -0 */
		1003	uint32_t m;
		1004	int e;
		1005
		1006	if (x == 0e0f ) return 0x00000000U;
		1007	if (x > +3.40282346638528860e+38f) return 0x7f800000U;
		1008	if (x < -3.40282346638528860e+38f) return 0xff800000U;
		1009	if (x != x ) return 0x7fbfffffU;
		1010
		1011	m = ecb_frexpf (x, &e) * 0x1000000U;
		1012
		1013	r = m & 0x80000000U;
		1014
		1015	if (r)
		1016	m = -m;
		1017
		1018	if (e <= -126)
		1019	{
		1020	m &= 0xffffffU;
		1021	m >>= (-125 - e);
		1022	e = -126;
		1023	}
		1024
		1025	r \|= (e + 126) << 23;
		1026	r \|= m & 0x7fffffU;
		1027	#endif
		1028
		1029	return r;
		1030	}
		1031
		1032	/* converts an ieee single/binary32 to a float */
		1033	ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
		1034	ecb_function_ ecb_const float
		1035	ecb_binary32_to_float (uint32_t x)
		1036	{
		1037	float r;
		1038
		1039	#if ECB_STDFP
		1040	memcpy (&r, &x, 4);
		1041	#else
		1042	/* emulation, only works for normals and subnormals and +0 */
		1043	int neg = x >> 31;
		1044	int e = (x >> 23) & 0xffU;
		1045
		1046	x &= 0x7fffffU;
		1047
		1048	if (e)
		1049	x \|= 0x800000U;
		1050	else
		1051	e = 1;
		1052
		1053	/* we distrust ldexpf a bit and do the 2*-24 scaling by an extra multiply /
		1054	r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
		1055
		1056	r = neg ? -r : r;
		1057	#endif
		1058
		1059	return r;
		1060	}
		1061
		1062	/* convert a double to ieee double/binary64 */
		1063	ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
		1064	ecb_function_ ecb_const uint64_t
		1065	ecb_double_to_binary64 (double x)
		1066	{
		1067	uint64_t r;
		1068
		1069	#if ECB_STDFP
		1070	memcpy (&r, &x, 8);
		1071	#else
		1072	/* slow emulation, works for anything but -0 */
		1073	uint64_t m;
		1074	int e;
		1075
		1076	if (x == 0e0 ) return 0x0000000000000000U;
		1077	if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
		1078	if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
		1079	if (x != x ) return 0X7ff7ffffffffffffU;
		1080
		1081	m = frexp (x, &e) * 0x20000000000000U;
		1082
		1083	r = m & 0x8000000000000000;;
		1084
		1085	if (r)
		1086	m = -m;
		1087
		1088	if (e <= -1022)
		1089	{
		1090	m &= 0x1fffffffffffffU;
		1091	m >>= (-1021 - e);
		1092	e = -1022;
		1093	}
		1094
		1095	r \|= ((uint64_t)(e + 1022)) << 52;
		1096	r \|= m & 0xfffffffffffffU;
		1097	#endif
		1098
		1099	return r;
		1100	}
		1101
		1102	/* converts an ieee double/binary64 to a double */
		1103	ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
		1104	ecb_function_ ecb_const double
		1105	ecb_binary64_to_double (uint64_t x)
		1106	{
		1107	double r;
		1108
		1109	#if ECB_STDFP
		1110	memcpy (&r, &x, 8);
		1111	#else
		1112	/* emulation, only works for normals and subnormals and +0 */
		1113	int neg = x >> 63;
		1114	int e = (x >> 52) & 0x7ffU;
		1115
		1116	x &= 0xfffffffffffffU;
		1117
		1118	if (e)
		1119	x \|= 0x10000000000000U;
		1120	else
		1121	e = 1;
		1122
		1123	/* we distrust ldexp a bit and do the 2*-53 scaling by an extra multiply /
		1124	r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
		1125
		1126	r = neg ? -r : r;
		1127	#endif
		1128
		1129	return r;
		1130	}
		1131
		1132	/* convert a float to ieee half/binary16 */
		1133	ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
		1134	ecb_function_ ecb_const uint16_t
		1135	ecb_float_to_binary16 (float x)
		1136	{
		1137	return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
		1138	}
		1139
		1140	/* convert an ieee half/binary16 to float */
		1141	ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
		1142	ecb_function_ ecb_const float
		1143	ecb_binary16_to_float (uint16_t x)
		1144	{
		1145	return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
		1146	}
		1147
		1148	#endif
		1149
		1150	#endif
		1151

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Comparing libeio/ecb.h (file contents): Revision 1.10 by root, Mon Sep 26 16:54:25 2011 UTC vs. Revision 1.31 by root, Thu Sep 3 17:20:45 2020 UTC

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Comparing libeio/ecb.h (file contents):
Revision 1.10 by root, Mon Sep 26 16:54:25 2011 UTC vs.
Revision 1.31 by root, Thu Sep 3 17:20:45 2020 UTC