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Comparing libecb/ecb.h (file contents):
Revision 1.56 by sf-exg, Thu Jul 28 13:45:44 2011 UTC vs.
Revision 1.209 by root, Fri Mar 25 15:23:14 2022 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 (©) 2009-2015,2018-2021 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 0x0001000c
		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
		107	#endif
		108
		109	#if ECB_PTRSIZE >= 8 || ECB_AMD64_X32
		110	#define ECB_64BIT_NATIVE 1
		111	#else
		112	#define ECB_64BIT_NATIVE 0
49	#endif	113	#endif
50		114
51	/* many compilers define _GNUC_ to some versions but then only implement	115	/* many compilers define _GNUC_ to some versions but then only implement
52	* what their idiot authors think are the "more important" extensions,	116	* what their idiot authors think are the "more important" extensions,
53	* causing enourmous grief in return for some better fake benchmark numbers.	117	* causing enormous grief in return for some better fake benchmark numbers.
54	* or so.	118	* or so.
55	* we try to detect these and simply assume they are not gcc - if they have	119	* 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.	120	* an issue with that they should have done it right in the first place.
57	*/	121	*/
58	#ifndef ECB_GCC_VERSION
59	#if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)	122	#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	123	#define ECB_GCC_VERSION(major,minor) 0
61	#else	124	#else
62	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))	125	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
63	#endif	126	#endif
		127
		128	#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
		129
		130	#if __clang__ && defined __has_builtin
		131	#define ECB_CLANG_BUILTIN(x) __has_builtin (x)
		132	#else
		133	#define ECB_CLANG_BUILTIN(x) 0
		134	#endif
		135
		136	#if __clang__ && defined __has_extension
		137	#define ECB_CLANG_EXTENSION(x) __has_extension (x)
		138	#else
		139	#define ECB_CLANG_EXTENSION(x) 0
		140	#endif
		141
		142	#define ECB_CPP (__cplusplus+0)
		143	#define ECB_CPP11 (__cplusplus >= 201103L)
		144	#define ECB_CPP14 (__cplusplus >= 201402L)
		145	#define ECB_CPP17 (__cplusplus >= 201703L)
		146
		147	#if ECB_CPP
		148	#define ECB_C 0
		149	#define ECB_STDC_VERSION 0
		150	#else
		151	#define ECB_C 1
		152	#define ECB_STDC_VERSION __STDC_VERSION__
		153	#endif
		154
		155	#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
		156	#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
		157	#define ECB_C17 (ECB_STDC_VERSION >= 201710L)
		158
		159	#if ECB_CPP
		160	#define ECB_EXTERN_C extern "C"
		161	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {
		162	#define ECB_EXTERN_C_END }
		163	#else
		164	#define ECB_EXTERN_C extern
		165	#define ECB_EXTERN_C_BEG
		166	#define ECB_EXTERN_C_END
64	#endif	167	#endif
65		168
66	/*****************************************************************************/	169	/*****************************************************************************/
67		170
		171	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
		172	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
		173
		174	#if ECB_NO_THREADS
		175	#define ECB_NO_SMP 1
		176	#endif
		177
		178	#if ECB_NO_SMP
		179	#define ECB_MEMORY_FENCE do { } while (0)
		180	#endif
		181
		182	/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
		183	#if __xlC__ && ECB_CPP
		184	#include <builtins.h>
		185	#endif
		186
		187	#if 1400 <= _MSC_VER
		188	#include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
		189	#endif
		190
68	#ifndef ECB_MEMORY_FENCE	191	#ifndef ECB_MEMORY_FENCE
69	#if ECB_GCC_VERSION(2,5)	192	#if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
70	#if __x86	193	#define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory")
		194	#if __i386 || __i386__
71	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")	195	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
72	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE	196	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
73	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE /* better be safe than sorry */	197	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
74	#elif __amd64	198	#elif ECB_GCC_AMD64
75	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")	199	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
76	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")	200	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
		201	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
		202	#elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
		203	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		204	#elif defined __ARM_ARCH_2__ \
		205	|| defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \
		206	|| defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \
		207	|| defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \
		208	|| defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
		209	|| defined __ARM_ARCH_5TEJ__
		210	/* should not need any, unless running old code on newer cpu - arm doesn't support that */
		211	#elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
		212	|| defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
		213	|| defined __ARM_ARCH_6T2__
		214	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
		215	#elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
		216	|| defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
		217	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
		218	#elif __aarch64__
		219	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
		220	#elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
		221	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
		222	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
		223	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
		224	#elif defined __s390__ || defined __s390x__
		225	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
		226	#elif defined __mips__
		227	/* GNU/Linux emulates sync on mips1 architectures, so we force its use */
		228	/* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
		229	#define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
		230	#elif defined __alpha__
		231	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
		232	#elif defined __hppa__
		233	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
77	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence")	234	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		235	#elif defined __ia64__
		236	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
		237	#elif defined __m68k__
		238	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		239	#elif defined __m88k__
		240	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
		241	#elif defined __sh__
		242	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
78	#endif	243	#endif
79	#endif	244	#endif
80	#endif	245	#endif
81		246
82	#ifndef ECB_MEMORY_FENCE	247	#ifndef ECB_MEMORY_FENCE
83	#if ECB_GCC_VERSION(4,4)	248	#if ECB_GCC_VERSION(4,7)
		249	/* see comment below (stdatomic.h) about the C11 memory model. */
		250	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
		251	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
		252	#define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
		253	#undef ECB_MEMORY_FENCE_RELAXED
		254	#define ECB_MEMORY_FENCE_RELAXED __atomic_thread_fence (__ATOMIC_RELAXED)
		255
		256	#elif ECB_CLANG_EXTENSION(c_atomic)
		257	/* see comment below (stdatomic.h) about the C11 memory model. */
		258	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
		259	#define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
		260	#define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
		261	#undef ECB_MEMORY_FENCE_RELAXED
		262	#define ECB_MEMORY_FENCE_RELAXED __c11_atomic_thread_fence (__ATOMIC_RELAXED)
		263
		264	#elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
84	#define ECB_MEMORY_FENCE __sync_synchronize ()	265	#define ECB_MEMORY_FENCE __sync_synchronize ()
85	#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); })	266	#elif _MSC_VER >= 1500 /* VC++ 2008 */
86	#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); })	267	/* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
87	#elif _MSC_VER >= 1400 && 0 /* TODO: only true when using volatiles */	268	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		269	#define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
		270	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
		271	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
		272	#elif _MSC_VER >= 1400 /* VC++ 2005 */
		273	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
88	#define ECB_MEMORY_FENCE do { } while (0)	274	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
89	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE	275	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
90	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE	276	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
91	#elif defined(_WIN32)	277	#elif defined _WIN32
92	#include <WinNT.h>	278	#include <WinNT.h>
		279	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
		280	#elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
		281	#include <mbarrier.h>
93	#define ECB_MEMORY_FENCE MemoryBarrier ()	282	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
94	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE	283	#define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier ()
95	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE	284	#define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier ()
		285	#define ECB_MEMORY_FENCE_RELAXED __compiler_barrier ()
		286	#elif __xlC__
		287	#define ECB_MEMORY_FENCE __sync ()
96	#endif	288	#endif
97	#endif	289	#endif
98		290
99	#ifndef ECB_MEMORY_FENCE	291	#ifndef ECB_MEMORY_FENCE
		292	#if ECB_C11 && !defined __STDC_NO_ATOMICS__
		293	/* we assume that these memory fences work on all variables/all memory accesses, */
		294	/* not just C11 atomics and atomic accesses */
		295	#include <stdatomic.h>
		296	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
		297	#define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
		298	#define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
		299	#endif
		300	#endif
		301
		302	#ifndef ECB_MEMORY_FENCE
		303	#if !ECB_AVOID_PTHREADS
		304	/*
		305	* if you get undefined symbol references to pthread_mutex_lock,
		306	* or failure to find pthread.h, then you should implement
		307	* the ECB_MEMORY_FENCE operations for your cpu/compiler
		308	* OR provide pthread.h and link against the posix thread library
		309	* of your system.
		310	*/
100	#include <pthread.h>	311	#include <pthread.h>
		312	#define ECB_NEEDS_PTHREADS 1
		313	#define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
101		314
102	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;	315	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
103	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)	316	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
		317	#endif
		318	#endif
		319
		320	#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
104	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE	321	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
		322	#endif
		323
		324	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
105	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE	325	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
106	#endif	326	#endif
107		327
		328	#if !defined ECB_MEMORY_FENCE_RELAXED && defined ECB_MEMORY_FENCE
		329	#define ECB_MEMORY_FENCE_RELAXED ECB_MEMORY_FENCE /* very heavy-handed */
		330	#endif
		331
108	/*****************************************************************************/	332	/*****************************************************************************/
109		333
110	#define ECB_C99 (__STDC_VERSION__ >= 199901L)	334	#if ECB_CPP
111
112	#if __cplusplus
113	#define ecb_inline static inline	335	#define ecb_inline static inline
114	#elif ECB_GCC_VERSION(2,5)	336	#elif ECB_GCC_VERSION(2,5)
115	#define ecb_inline static __inline__	337	#define ecb_inline static __inline__
116	#elif ECB_C99	338	#elif ECB_C99
117	#define ecb_inline static inline	339	#define ecb_inline static inline
…		…
131		353
132	#define ECB_CONCAT_(a, b) a ## b	354	#define ECB_CONCAT_(a, b) a ## b
133	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	355	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
134	#define ECB_STRINGIFY_(a) # a	356	#define ECB_STRINGIFY_(a) # a
135	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)	357	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
		358	#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
136		359
137	#define ecb_function_ ecb_inline	360	#define ecb_function_ ecb_inline
138		361
139	#if ECB_GCC_VERSION(3,1)	362	#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
140	#define ecb_attribute(attrlist) __attribute__(attrlist)	363	#define ecb_attribute(attrlist) __attribute__ (attrlist)
		364	#else
		365	#define ecb_attribute(attrlist)
		366	#endif
		367
		368	#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
141	#define ecb_is_constant(expr) __builtin_constant_p (expr)	369	#define ecb_is_constant(expr) __builtin_constant_p (expr)
		370	#else
		371	/* possible C11 impl for integral types
		372	typedef struct ecb_is_constant_struct ecb_is_constant_struct;
		373	#define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
		374
		375	#define ecb_is_constant(expr) 0
		376	#endif
		377
		378	#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
142	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))	379	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
		380	#else
		381	#define ecb_expect(expr,value) (expr)
		382	#endif
		383
		384	#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
143	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)	385	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
144	#else	386	#else
145	#define ecb_attribute(attrlist)
146	#define ecb_is_constant(expr) 0
147	#define ecb_expect(expr,value) (expr)
148	#define ecb_prefetch(addr,rw,locality)	387	#define ecb_prefetch(addr,rw,locality)
149	#endif	388	#endif
150		389
151	/* no emulation for ecb_decltype */	390	/* no emulation for ecb_decltype */
152	#if ECB_GCC_VERSION(4,5)	391	#if ECB_CPP11
		392	// older implementations might have problems with decltype(x)::type, work around it
		393	template<class T> struct ecb_decltype_t { typedef T type; };
153	#define ecb_decltype(x) __decltype(x)	394	#define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
154	#elif ECB_GCC_VERSION(3,0)	395	#elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
155	#define ecb_decltype(x) __typeof(x)	396	#define ecb_decltype(x) __typeof__ (x)
156	#endif	397	#endif
157		398
		399	#if _MSC_VER >= 1300
		400	#define ecb_deprecated __declspec (deprecated)
		401	#else
		402	#define ecb_deprecated ecb_attribute ((__deprecated__))
		403	#endif
		404
		405	#if _MSC_VER >= 1500
		406	#define ecb_deprecated_message(msg) __declspec (deprecated (msg))
		407	#elif ECB_GCC_VERSION(4,5)
		408	#define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
		409	#else
		410	#define ecb_deprecated_message(msg) ecb_deprecated
		411	#endif
		412
		413	#if _MSC_VER >= 1400
		414	#define ecb_noinline __declspec (noinline)
		415	#else
158	#define ecb_noinline ecb_attribute ((__noinline__))	416	#define ecb_noinline ecb_attribute ((__noinline__))
159	#define ecb_noreturn ecb_attribute ((__noreturn__))	417	#endif
		418
160	#define ecb_unused ecb_attribute ((__unused__))	419	#define ecb_unused ecb_attribute ((__unused__))
161	#define ecb_const ecb_attribute ((__const__))	420	#define ecb_const ecb_attribute ((__const__))
162	#define ecb_pure ecb_attribute ((__pure__))	421	#define ecb_pure ecb_attribute ((__pure__))
		422
		423	#if ECB_C11 || __IBMC_NORETURN
		424	/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
		425	#define ecb_noreturn _Noreturn
		426	#elif ECB_CPP11
		427	#define ecb_noreturn [[noreturn]]
		428	#elif _MSC_VER >= 1200
		429	/* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
		430	#define ecb_noreturn __declspec (noreturn)
		431	#else
		432	#define ecb_noreturn ecb_attribute ((__noreturn__))
		433	#endif
163		434
164	#if ECB_GCC_VERSION(4,3)	435	#if ECB_GCC_VERSION(4,3)
165	#define ecb_artificial ecb_attribute ((__artificial__))	436	#define ecb_artificial ecb_attribute ((__artificial__))
166	#define ecb_hot ecb_attribute ((__hot__))	437	#define ecb_hot ecb_attribute ((__hot__))
167	#define ecb_cold ecb_attribute ((__cold__))	438	#define ecb_cold ecb_attribute ((__cold__))
…		…
179	/* for compatibility to the rest of the world */	450	/* for compatibility to the rest of the world */
180	#define ecb_likely(expr) ecb_expect_true (expr)	451	#define ecb_likely(expr) ecb_expect_true (expr)
181	#define ecb_unlikely(expr) ecb_expect_false (expr)	452	#define ecb_unlikely(expr) ecb_expect_false (expr)
182		453
183	/* count trailing zero bits and count # of one bits */	454	/* count trailing zero bits and count # of one bits */
184	#if ECB_GCC_VERSION(3,4)	455	#if ECB_GCC_VERSION(3,4) \
185	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */	456	|| (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
186	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)	457	&& ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
187	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)	458	&& ECB_CLANG_BUILTIN(__builtin_popcount))
188	#define ecb_ctz32(x) __builtin_ctz (x)	459	#define ecb_ctz32(x) __builtin_ctz (x)
		460	#define ecb_ctz64(x) (__SIZEOF_LONG__ == 64 ? __builtin_ctzl (x) : __builtin_ctzll (x))
189	#define ecb_ctz64(x) __builtin_ctzll (x)	461	#define ecb_clz32(x) __builtin_clz (x)
		462	#define ecb_clz64(x) (__SIZEOF_LONG__ == 64 ? __builtin_clzl (x) : __builtin_clzll (x))
		463	#define ecb_ld32(x) (ecb_clz32 (x) ^ 31)
		464	#define ecb_ld64(x) (ecb_clz64 (x) ^ 63)
190	#define ecb_popcount32(x) __builtin_popcount (x)	465	#define ecb_popcount32(x) __builtin_popcount (x)
191	/* no popcountll */	466	/* ecb_popcount64 is more difficult, see below */
192	#else	467	#else
193	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;	468	ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
194	ecb_function_ int	469	ecb_function_ ecb_const int
195	ecb_ctz32 (uint32_t x)	470	ecb_ctz32 (uint32_t x)
196	{	471	{
		472	#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
		473	unsigned long r;
		474	_BitScanForward (&r, x);
		475	return (int)r;
		476	#else
197	int r = 0;	477	int r;
198		478
199	x &= ~x + 1; /* this isolates the lowest bit */	479	x &= ~x + 1; /* this isolates the lowest bit */
200		480
201	#if ECB_branchless_on_i386	481	#if 1
		482	/* David Seal's algorithm, Message-ID: <32975@armltd.uucp> from 1994 */
		483	/* This happens to return 32 for x == 0, but the API does not support this */
		484
		485	/* -0 marks unused entries */
		486	static unsigned char table[64] =
		487	{
		488	32, 0, 1, 12, 2, 6, -0, 13, 3, -0, 7, -0, -0, -0, -0, 14,
		489	10, 4, -0, -0, 8, -0, -0, 25, -0, -0, -0, -0, -0, 21, 27, 15,
		490	31, 11, 5, -0, -0, -0, -0, -0, 9, -0, -0, 24, -0, -0, 20, 26,
		491	30, -0, -0, -0, -0, 23, -0, 19, 29, -0, 22, 18, 28, 17, 16, -0
		492	};
		493
		494	/* magic constant results in 33 unique values in the upper 6 bits */
		495	x *= 0x0450fbafU; /* == 17 * 65 * 65535 */
		496
		497	r = table [x >> 26];
		498	#elif 0 /* branchless on i386, typically */
		499	r = 0;
202	r += !!(x & 0xaaaaaaaa) << 0;	500	r += !!(x & 0xaaaaaaaa) << 0;
203	r += !!(x & 0xcccccccc) << 1;	501	r += !!(x & 0xcccccccc) << 1;
204	r += !!(x & 0xf0f0f0f0) << 2;	502	r += !!(x & 0xf0f0f0f0) << 2;
205	r += !!(x & 0xff00ff00) << 3;	503	r += !!(x & 0xff00ff00) << 3;
206	r += !!(x & 0xffff0000) << 4;	504	r += !!(x & 0xffff0000) << 4;
207	#else	505	#else /* branchless on modern compilers, typically */
		506	r = 0;
208	if (x & 0xaaaaaaaa) r += 1;	507	if (x & 0xaaaaaaaa) r += 1;
209	if (x & 0xcccccccc) r += 2;	508	if (x & 0xcccccccc) r += 2;
210	if (x & 0xf0f0f0f0) r += 4;	509	if (x & 0xf0f0f0f0) r += 4;
211	if (x & 0xff00ff00) r += 8;	510	if (x & 0xff00ff00) r += 8;
212	if (x & 0xffff0000) r += 16;	511	if (x & 0xffff0000) r += 16;
213	#endif	512	#endif
214		513
215	return r;	514	return r;
		515	#endif
216	}	516	}
217		517
218	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;	518	ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
219	ecb_function_ int	519	ecb_function_ ecb_const int
220	ecb_ctz64 (uint64_t x)	520	ecb_ctz64 (uint64_t x)
221	{	521	{
		522	#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
		523	unsigned long r;
		524	_BitScanForward64 (&r, x);
		525	return (int)r;
		526	#else
222	int shift = x & 0xffffffffU ? 0 : 32;	527	int shift = x & 0xffffffff ? 0 : 32;
223	return ecb_ctz32 (x >> shift) + shift;	528	return ecb_ctz32 (x >> shift) + shift;
		529	#endif
224	}	530	}
225		531
		532	ecb_function_ ecb_const int ecb_clz32 (uint32_t x);
		533	ecb_function_ ecb_const int
		534	ecb_clz32 (uint32_t x)
		535	{
		536	#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
		537	unsigned long r;
		538	_BitScanReverse (&r, x);
		539	return (int)r;
		540	#else
		541
		542	/* Robert Harley's algorithm from comp.arch 1996-12-07 */
		543	/* This happens to return 32 for x == 0, but the API does not support this */
		544
		545	/* -0 marks unused table elements */
		546	static unsigned char table[64] =
		547	{
		548	32, 31, -0, 16, -0, 30, 3, -0, 15, -0, -0, -0, 29, 10, 2, -0,
		549	-0, -0, 12, 14, 21, -0, 19, -0, -0, 28, -0, 25, -0, 9, 1, -0,
		550	17, -0, 4, -0, -0, -0, 11, -0, 13, 22, 20, -0, 26, -0, -0, 18,
		551	5, -0, -0, 23, -0, 27, -0, 6, -0, 24, 7, -0, 8, -0, 0, -0
		552	};
		553
		554	/* propagate leftmost 1 bit to the right */
		555	x |= x >> 1;
		556	x |= x >> 2;
		557	x |= x >> 4;
		558	x |= x >> 8;
		559	x |= x >> 16;
		560
		561	/* magic constant results in 33 unique values in the upper 6 bits */
		562	x *= 0x06EB14F9U; /* == 7 * 255 * 255 * 255 */
		563
		564	return table [x >> 26];
		565	#endif
		566	}
		567
		568	ecb_function_ ecb_const int ecb_clz64 (uint64_t x);
		569	ecb_function_ ecb_const int
		570	ecb_clz64 (uint64_t x)
		571	{
		572	#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
		573	unsigned long r;
		574	_BitScanReverse64 (&r, x);
		575	return (int)r;
		576	#else
		577	uint32_t l = x >> 32;
		578	int shift = l ? 0 : 32;
		579	return ecb_clz32 (l ? l : x) + shift;
		580	#endif
		581	}
		582
226	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;	583	ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
227	ecb_function_ int	584	ecb_function_ ecb_const int
228	ecb_popcount32 (uint32_t x)	585	ecb_popcount32 (uint32_t x)
229	{	586	{
230	x -= (x >> 1) & 0x55555555;	587	x -= (x >> 1) & 0x55555555;
231	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);	588	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
232	x = ((x >> 4) + x) & 0x0f0f0f0f;	589	x = ((x >> 4) + x) & 0x0f0f0f0f;
233	x *= 0x01010101;	590	x *= 0x01010101;
234		591
235	return x >> 24;	592	return x >> 24;
236	}	593	}
237		594
238	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;	595	ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
239	ecb_function_ int ecb_ld32 (uint32_t x)	596	ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
240	{	597	{
		598	#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
		599	unsigned long r;
		600	_BitScanReverse (&r, x);
		601	return (int)r;
		602	#else
241	int r = 0;	603	int r = 0;
242		604
243	if (x >> 16) { x >>= 16; r += 16; }	605	if (x >> 16) { x >>= 16; r += 16; }
244	if (x >> 8) { x >>= 8; r += 8; }	606	if (x >> 8) { x >>= 8; r += 8; }
245	if (x >> 4) { x >>= 4; r += 4; }	607	if (x >> 4) { x >>= 4; r += 4; }
246	if (x >> 2) { x >>= 2; r += 2; }	608	if (x >> 2) { x >>= 2; r += 2; }
247	if (x >> 1) { r += 1; }	609	if (x >> 1) { r += 1; }
248		610
249	return r;	611	return r;
		612	#endif
250	}	613	}
251		614
252	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;	615	ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
253	ecb_function_ int ecb_ld64 (uint64_t x)	616	ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
254	{	617	{
		618	#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
		619	unsigned long r;
		620	_BitScanReverse64 (&r, x);
		621	return (int)r;
		622	#else
255	int r = 0;	623	int r = 0;
256		624
257	if (x >> 32) { x >>= 32; r += 32; }	625	if (x >> 32) { x >>= 32; r += 32; }
258		626
259	return r + ecb_ld32 (x);	627	return r + ecb_ld32 (x);
260	}
261	#endif	628	#endif
		629	}
		630	#endif
262		631
263	/* popcount64 is only available on 64 bit cpus as gcc builtin */	632	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
264	/* so for this version we are lazy */	633	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
		634	ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
		635	ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
		636
		637	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
		638	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
		639	{
		640	return ( (x * 0x0802U & 0x22110U)
		641	| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
		642	}
		643
		644	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
		645	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
		646	{
		647	x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
		648	x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
		649	x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
		650	x = ( x >> 8 ) | ( x << 8);
		651
		652	return x;
		653	}
		654
		655	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
		656	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
		657	{
		658	x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
		659	x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
		660	x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
		661	x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
		662	x = ( x >> 16 ) | ( x << 16);
		663
		664	return x;
		665	}
		666
265	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;	667	ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
266	ecb_function_ int	668	ecb_function_ ecb_const int
267	ecb_popcount64 (uint64_t x)	669	ecb_popcount64 (uint64_t x)
268	{	670	{
		671	/* popcount64 is only available on 64 bit cpus as gcc builtin. */
		672	/* also, gcc/clang make this surprisingly difficult to use */
		673	#if (__SIZEOF_LONG__ == 8) && (ECB_GCC_VERSION(3,4) || ECB_CLANG_BUILTIN (__builtin_popcountl))
		674	return __builtin_popcountl (x);
		675	#else
269	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);	676	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
		677	#endif
270	}	678	}
271		679
272	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;	680	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
273	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;	681	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
274	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;	682	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
275	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;	683	ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
276	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;	684	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
277	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;	685	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
278	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;	686	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
279	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;	687	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
280		688
281	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }	689	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> (-count & 7)) | (x << (count & 7)); }
282	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }	690	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << (-count & 7)) | (x >> (count & 7)); }
283	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }	691	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (-count & 15)) | (x << (count & 15)); }
284	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }	692	ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (-count & 15)) | (x >> (count & 15)); }
285	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }	693	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (-count & 31)) | (x << (count & 31)); }
286	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }	694	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (-count & 31)) | (x >> (count & 31)); }
287	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }	695	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (-count & 63)) | (x << (count & 63)); }
288	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }	696	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (-count & 63)) | (x >> (count & 63)); }
289		697
290	#if ECB_GCC_VERSION(4,3)	698	#if ECB_CPP
		699
		700	inline uint8_t ecb_ctz (uint8_t v) { return ecb_ctz32 (v); }
		701	inline uint16_t ecb_ctz (uint16_t v) { return ecb_ctz32 (v); }
		702	inline uint32_t ecb_ctz (uint32_t v) { return ecb_ctz32 (v); }
		703	inline uint64_t ecb_ctz (uint64_t v) { return ecb_ctz64 (v); }
		704
		705	inline bool ecb_is_pot (uint8_t v) { return ecb_is_pot32 (v); }
		706	inline bool ecb_is_pot (uint16_t v) { return ecb_is_pot32 (v); }
		707	inline bool ecb_is_pot (uint32_t v) { return ecb_is_pot32 (v); }
		708	inline bool ecb_is_pot (uint64_t v) { return ecb_is_pot64 (v); }
		709
		710	inline int ecb_ld (uint8_t v) { return ecb_ld32 (v); }
		711	inline int ecb_ld (uint16_t v) { return ecb_ld32 (v); }
		712	inline int ecb_ld (uint32_t v) { return ecb_ld32 (v); }
		713	inline int ecb_ld (uint64_t v) { return ecb_ld64 (v); }
		714
		715	inline int ecb_popcount (uint8_t v) { return ecb_popcount32 (v); }
		716	inline int ecb_popcount (uint16_t v) { return ecb_popcount32 (v); }
		717	inline int ecb_popcount (uint32_t v) { return ecb_popcount32 (v); }
		718	inline int ecb_popcount (uint64_t v) { return ecb_popcount64 (v); }
		719
		720	inline uint8_t ecb_bitrev (uint8_t v) { return ecb_bitrev8 (v); }
		721	inline uint16_t ecb_bitrev (uint16_t v) { return ecb_bitrev16 (v); }
		722	inline uint32_t ecb_bitrev (uint32_t v) { return ecb_bitrev32 (v); }
		723
		724	inline uint8_t ecb_rotl (uint8_t v, unsigned int count) { return ecb_rotl8 (v, count); }
		725	inline uint16_t ecb_rotl (uint16_t v, unsigned int count) { return ecb_rotl16 (v, count); }
		726	inline uint32_t ecb_rotl (uint32_t v, unsigned int count) { return ecb_rotl32 (v, count); }
		727	inline uint64_t ecb_rotl (uint64_t v, unsigned int count) { return ecb_rotl64 (v, count); }
		728
		729	inline uint8_t ecb_rotr (uint8_t v, unsigned int count) { return ecb_rotr8 (v, count); }
		730	inline uint16_t ecb_rotr (uint16_t v, unsigned int count) { return ecb_rotr16 (v, count); }
		731	inline uint32_t ecb_rotr (uint32_t v, unsigned int count) { return ecb_rotr32 (v, count); }
		732	inline uint64_t ecb_rotr (uint64_t v, unsigned int count) { return ecb_rotr64 (v, count); }
		733
		734	#endif
		735
		736	#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
		737	#if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
		738	#define ecb_bswap16(x) __builtin_bswap16 (x)
		739	#else
291	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)	740	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
		741	#endif
292	#define ecb_bswap32(x) __builtin_bswap32 (x)	742	#define ecb_bswap32(x) __builtin_bswap32 (x)
293	#define ecb_bswap64(x) __builtin_bswap64 (x)	743	#define ecb_bswap64(x) __builtin_bswap64 (x)
		744	#elif _MSC_VER
		745	#include <stdlib.h>
		746	#define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
		747	#define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
		748	#define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
294	#else	749	#else
295	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;	750	ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
296	ecb_function_ uint16_t	751	ecb_function_ ecb_const uint16_t
297	ecb_bswap16 (uint16_t x)	752	ecb_bswap16 (uint16_t x)
298	{	753	{
299	return ecb_rotl16 (x, 8);	754	return ecb_rotl16 (x, 8);
300	}	755	}
301		756
302	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;	757	ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
303	ecb_function_ uint32_t	758	ecb_function_ ecb_const uint32_t
304	ecb_bswap32 (uint32_t x)	759	ecb_bswap32 (uint32_t x)
305	{	760	{
306	return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);	761	return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
307	}	762	}
308		763
309	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;	764	ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
310	ecb_function_ uint64_t	765	ecb_function_ ecb_const uint64_t
311	ecb_bswap64 (uint64_t x)	766	ecb_bswap64 (uint64_t x)
312	{	767	{
313	return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);	768	return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
314	}	769	}
315	#endif	770	#endif
316		771
317	#if ECB_GCC_VERSION(4,5)	772	#if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
318	#define ecb_unreachable() __builtin_unreachable ()	773	#define ecb_unreachable() __builtin_unreachable ()
319	#else	774	#else
320	/* this seems to work fine, but gcc always emits a warning for it :/ */	775	/* this seems to work fine, but gcc always emits a warning for it :/ */
321	ecb_function_ void ecb_unreachable (void) ecb_noreturn;	776	ecb_inline ecb_noreturn void ecb_unreachable (void);
322	ecb_function_ void ecb_unreachable (void) { }	777	ecb_inline ecb_noreturn void ecb_unreachable (void) { }
323	#endif	778	#endif
324		779
325	/* try to tell the compiler that some condition is definitely true */	780	/* try to tell the compiler that some condition is definitely true */
326	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)	781	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
327		782
328	ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;	783	ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
329	ecb_function_ unsigned char	784	ecb_inline ecb_const uint32_t
330	ecb_byteorder_helper (void)	785	ecb_byteorder_helper (void)
331	{	786	{
332	const uint32_t u = 0x11223344;	787	/* the union code still generates code under pressure in gcc, */
333	return *(unsigned char *)&u;	788	/* but less than using pointers, and always seems to */
		789	/* successfully return a constant. */
		790	/* the reason why we have this horrible preprocessor mess */
		791	/* is to avoid it in all cases, at least on common architectures */
		792	/* or when using a recent enough gcc version (>= 4.6) */
		793	#if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
		794	|| ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
		795	#define ECB_LITTLE_ENDIAN 1
		796	return 0x44332211;
		797	#elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
		798	|| ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
		799	#define ECB_BIG_ENDIAN 1
		800	return 0x11223344;
		801	#else
		802	union
		803	{
		804	uint8_t c[4];
		805	uint32_t u;
		806	} u = { 0x11, 0x22, 0x33, 0x44 };
		807	return u.u;
		808	#endif
334	}	809	}
335		810
336	ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;	811	ecb_inline ecb_const ecb_bool ecb_big_endian (void);
337	ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }	812	ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
338	ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;	813	ecb_inline ecb_const ecb_bool ecb_little_endian (void);
339	ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }	814	ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
		815
		816	/*****************************************************************************/
		817	/* unaligned load/store */
		818
		819	ecb_inline uint_fast16_t ecb_be_u16_to_host (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
		820	ecb_inline uint_fast32_t ecb_be_u32_to_host (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
		821	ecb_inline uint_fast64_t ecb_be_u64_to_host (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
		822
		823	ecb_inline uint_fast16_t ecb_le_u16_to_host (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
		824	ecb_inline uint_fast32_t ecb_le_u32_to_host (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
		825	ecb_inline uint_fast64_t ecb_le_u64_to_host (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
		826
		827	ecb_inline uint_fast16_t ecb_peek_u16_u (const void *ptr) { uint16_t v; memcpy (&v, ptr, sizeof (v)); return v; }
		828	ecb_inline uint_fast32_t ecb_peek_u32_u (const void *ptr) { uint32_t v; memcpy (&v, ptr, sizeof (v)); return v; }
		829	ecb_inline uint_fast64_t ecb_peek_u64_u (const void *ptr) { uint64_t v; memcpy (&v, ptr, sizeof (v)); return v; }
		830
		831	ecb_inline uint_fast16_t ecb_peek_be_u16_u (const void *ptr) { return ecb_be_u16_to_host (ecb_peek_u16_u (ptr)); }
		832	ecb_inline uint_fast32_t ecb_peek_be_u32_u (const void *ptr) { return ecb_be_u32_to_host (ecb_peek_u32_u (ptr)); }
		833	ecb_inline uint_fast64_t ecb_peek_be_u64_u (const void *ptr) { return ecb_be_u64_to_host (ecb_peek_u64_u (ptr)); }
		834
		835	ecb_inline uint_fast16_t ecb_peek_le_u16_u (const void *ptr) { return ecb_le_u16_to_host (ecb_peek_u16_u (ptr)); }
		836	ecb_inline uint_fast32_t ecb_peek_le_u32_u (const void *ptr) { return ecb_le_u32_to_host (ecb_peek_u32_u (ptr)); }
		837	ecb_inline uint_fast64_t ecb_peek_le_u64_u (const void *ptr) { return ecb_le_u64_to_host (ecb_peek_u64_u (ptr)); }
		838
		839	ecb_inline uint_fast16_t ecb_host_to_be_u16 (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
		840	ecb_inline uint_fast32_t ecb_host_to_be_u32 (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
		841	ecb_inline uint_fast64_t ecb_host_to_be_u64 (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
		842
		843	ecb_inline uint_fast16_t ecb_host_to_le_u16 (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
		844	ecb_inline uint_fast32_t ecb_host_to_le_u32 (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
		845	ecb_inline uint_fast64_t ecb_host_to_le_u64 (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
		846
		847	ecb_inline void ecb_poke_u16_u (void *ptr, uint16_t v) { memcpy (ptr, &v, sizeof (v)); }
		848	ecb_inline void ecb_poke_u32_u (void *ptr, uint32_t v) { memcpy (ptr, &v, sizeof (v)); }
		849	ecb_inline void ecb_poke_u64_u (void *ptr, uint64_t v) { memcpy (ptr, &v, sizeof (v)); }
		850
		851	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)); }
		852	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)); }
		853	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)); }
		854
		855	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)); }
		856	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)); }
		857	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)); }
		858
		859	#if ECB_CPP
		860
		861	inline uint8_t ecb_bswap (uint8_t v) { return v; }
		862	inline uint16_t ecb_bswap (uint16_t v) { return ecb_bswap16 (v); }
		863	inline uint32_t ecb_bswap (uint32_t v) { return ecb_bswap32 (v); }
		864	inline uint64_t ecb_bswap (uint64_t v) { return ecb_bswap64 (v); }
		865
		866	template<typename T> inline T ecb_be_to_host (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
		867	template<typename T> inline T ecb_le_to_host (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
		868	template<typename T> inline T ecb_peek (const void *ptr) { return *(const T *)ptr; }
		869	template<typename T> inline T ecb_peek_be (const void *ptr) { return ecb_be_to_host (ecb_peek <T> (ptr)); }
		870	template<typename T> inline T ecb_peek_le (const void *ptr) { return ecb_le_to_host (ecb_peek <T> (ptr)); }
		871	template<typename T> inline T ecb_peek_u (const void *ptr) { T v; memcpy (&v, ptr, sizeof (v)); return v; }
		872	template<typename T> inline T ecb_peek_be_u (const void *ptr) { return ecb_be_to_host (ecb_peek_u<T> (ptr)); }
		873	template<typename T> inline T ecb_peek_le_u (const void *ptr) { return ecb_le_to_host (ecb_peek_u<T> (ptr)); }
		874
		875	template<typename T> inline T ecb_host_to_be (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
		876	template<typename T> inline T ecb_host_to_le (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
		877	template<typename T> inline void ecb_poke (void *ptr, T v) { *(T *)ptr = v; }
		878	template<typename T> inline void ecb_poke_be (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_be (v)); }
		879	template<typename T> inline void ecb_poke_le (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_le (v)); }
		880	template<typename T> inline void ecb_poke_u (void *ptr, T v) { memcpy (ptr, &v, sizeof (v)); }
		881	template<typename T> inline void ecb_poke_be_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_be (v)); }
		882	template<typename T> inline void ecb_poke_le_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_le (v)); }
		883
		884	#endif
		885
		886	/*****************************************************************************/
		887	/* pointer/integer hashing */
		888
		889	/* based on hash by Chris Wellons, https://nullprogram.com/blog/2018/07/31/ */
		890	ecb_function_ uint32_t ecb_mix32 (uint32_t v);
		891	ecb_function_ uint32_t ecb_mix32 (uint32_t v)
		892	{
		893	v ^= v >> 16; v *= 0x7feb352dU;
		894	v ^= v >> 15; v *= 0x846ca68bU;
		895	v ^= v >> 16;
		896	return v;
		897	}
		898
		899	ecb_function_ uint32_t ecb_unmix32 (uint32_t v);
		900	ecb_function_ uint32_t ecb_unmix32 (uint32_t v)
		901	{
		902	v ^= v >> 16 ; v *= 0x43021123U;
		903	v ^= v >> 15 ^ v >> 30; v *= 0x1d69e2a5U;
		904	v ^= v >> 16 ;
		905	return v;
		906	}
		907
		908	/* based on splitmix64, by Sebastiona Vigna, https://prng.di.unimi.it/splitmix64.c */
		909	ecb_function_ uint64_t ecb_mix64 (uint64_t v);
		910	ecb_function_ uint64_t ecb_mix64 (uint64_t v)
		911	{
		912	v ^= v >> 30; v *= 0xbf58476d1ce4e5b9U;
		913	v ^= v >> 27; v *= 0x94d049bb133111ebU;
		914	v ^= v >> 31;
		915	return v;
		916	}
		917
		918	ecb_function_ uint64_t ecb_unmix64 (uint64_t v);
		919	ecb_function_ uint64_t ecb_unmix64 (uint64_t v)
		920	{
		921	v ^= v >> 31 ^ v >> 62; v *= 0x319642b2d24d8ec3U;
		922	v ^= v >> 27 ^ v >> 54; v *= 0x96de1b173f119089U;
		923	v ^= v >> 30 ^ v >> 60;
		924	return v;
		925	}
		926
		927	ecb_function_ uintptr_t ecb_ptrmix (void *p);
		928	ecb_function_ uintptr_t ecb_ptrmix (void *p)
		929	{
		930	#if ECB_PTRSIZE <= 4
		931	return ecb_mix32 ((uint32_t)p);
		932	#else
		933	return ecb_mix64 ((uint64_t)p);
		934	#endif
		935	}
		936
		937	ecb_function_ void *ecb_ptrunmix (uintptr_t v);
		938	ecb_function_ void *ecb_ptrunmix (uintptr_t v)
		939	{
		940	#if ECB_PTRSIZE <= 4
		941	return (void *)ecb_unmix32 (v);
		942	#else
		943	return (void *)ecb_unmix64 (v);
		944	#endif
		945	}
		946
		947	#if ECB_CPP
		948
		949	template<typename T>
		950	inline uintptr_t ecb_ptrmix (T *p)
		951	{
		952	return ecb_ptrmix (static_cast<void *>(p));
		953	}
		954
		955	template<typename T>
		956	inline T *ecb_ptrunmix (uintptr_t v)
		957	{
		958	return static_cast<T *>(ecb_ptrunmix (v));
		959	}
		960
		961	#endif
		962
		963	/*****************************************************************************/
		964	/* gray code */
		965
		966	ecb_function_ uint_fast8_t ecb_gray8_encode (uint_fast8_t b) { return b ^ (b >> 1); }
		967	ecb_function_ uint_fast16_t ecb_gray16_encode (uint_fast16_t b) { return b ^ (b >> 1); }
		968	ecb_function_ uint_fast32_t ecb_gray32_encode (uint_fast32_t b) { return b ^ (b >> 1); }
		969	ecb_function_ uint_fast64_t ecb_gray64_encode (uint_fast64_t b) { return b ^ (b >> 1); }
		970
		971	ecb_function_ uint8_t ecb_gray8_decode (uint8_t g)
		972	{
		973	g ^= g >> 1;
		974	g ^= g >> 2;
		975	g ^= g >> 4;
		976
		977	return g;
		978	}
		979
		980	ecb_function_ uint16_t ecb_gray16_decode (uint16_t g)
		981	{
		982	g ^= g >> 1;
		983	g ^= g >> 2;
		984	g ^= g >> 4;
		985	g ^= g >> 8;
		986
		987	return g;
		988	}
		989
		990	ecb_function_ uint32_t ecb_gray32_decode (uint32_t g)
		991	{
		992	g ^= g >> 1;
		993	g ^= g >> 2;
		994	g ^= g >> 4;
		995	g ^= g >> 8;
		996	g ^= g >> 16;
		997
		998	return g;
		999	}
		1000
		1001	ecb_function_ uint64_t ecb_gray64_decode (uint64_t g)
		1002	{
		1003	g ^= g >> 1;
		1004	g ^= g >> 2;
		1005	g ^= g >> 4;
		1006	g ^= g >> 8;
		1007	g ^= g >> 16;
		1008	g ^= g >> 32;
		1009
		1010	return g;
		1011	}
		1012
		1013	#if ECB_CPP
		1014
		1015	ecb_function_ uint8_t ecb_gray_encode (uint8_t b) { return ecb_gray8_encode (b); }
		1016	ecb_function_ uint16_t ecb_gray_encode (uint16_t b) { return ecb_gray16_encode (b); }
		1017	ecb_function_ uint32_t ecb_gray_encode (uint32_t b) { return ecb_gray32_encode (b); }
		1018	ecb_function_ uint64_t ecb_gray_encode (uint64_t b) { return ecb_gray64_encode (b); }
		1019
		1020	ecb_function_ uint8_t ecb_gray_decode (uint8_t g) { return ecb_gray8_decode (g); }
		1021	ecb_function_ uint16_t ecb_gray_decode (uint16_t g) { return ecb_gray16_decode (g); }
		1022	ecb_function_ uint32_t ecb_gray_decode (uint32_t g) { return ecb_gray32_decode (g); }
		1023	ecb_function_ uint64_t ecb_gray_decode (uint64_t g) { return ecb_gray64_decode (g); }
		1024
		1025	#endif
		1026
		1027	/*****************************************************************************/
		1028	/* 2d hilbert curves */
		1029
		1030	/* algorithm from the book Hacker's Delight, modified to not */
		1031	/* run into undefined behaviour for n==16 */
		1032	static uint32_t
		1033	ecb_hilbert2d_index_to_coord32 (int n, uint32_t s)
		1034	{
		1035	uint32_t comp, swap, cs, t, sr;
		1036
		1037	/* pad s on the left (unused) bits with 01 (no change groups) */
		1038	s |= 0x55555555U << n << n;
		1039	/* "s shift right" */
		1040	sr = (s >> 1) & 0x55555555U;
		1041	/* compute complement and swap info in two-bit groups */
		1042	cs = ((s & 0x55555555U) + sr) ^ 0x55555555U;
		1043
		1044	/* parallel prefix xor op to propagate both complement
		1045	* and swap info together from left to right (there is
		1046	* no step "cs ^= cs >> 1", so in effect it computes
		1047	* two independent parallel prefix operations on two
		1048	* interleaved sets of sixteen bits).
		1049	*/
		1050	cs ^= cs >> 2;
		1051	cs ^= cs >> 4;
		1052	cs ^= cs >> 8;
		1053	cs ^= cs >> 16;
		1054
		1055	/* separate swap and complement bits */
		1056	swap = cs & 0x55555555U;
		1057	comp = (cs >> 1) & 0x55555555U;
		1058
		1059	/* calculate coordinates in odd and even bit positions */
		1060	t = (s & swap) ^ comp;
		1061	s = s ^ sr ^ t ^ (t << 1);
		1062
		1063	/* unpad/clear out any junk on the left */
		1064	s = s & ((1 << n << n) - 1);
		1065
		1066	/* Now "unshuffle" to separate the x and y bits. */
		1067	t = (s ^ (s >> 1)) & 0x22222222U; s ^= t ^ (t << 1);
		1068	t = (s ^ (s >> 2)) & 0x0c0c0c0cU; s ^= t ^ (t << 2);
		1069	t = (s ^ (s >> 4)) & 0x00f000f0U; s ^= t ^ (t << 4);
		1070	t = (s ^ (s >> 8)) & 0x0000ff00U; s ^= t ^ (t << 8);
		1071
		1072	/* now s contains two 16-bit coordinates */
		1073	return s;
		1074	}
		1075
		1076	/* 64 bit, a straightforward extension to the 32 bit case */
		1077	static uint64_t
		1078	ecb_hilbert2d_index_to_coord64 (int n, uint64_t s)
		1079	{
		1080	uint64_t comp, swap, cs, t, sr;
		1081
		1082	/* pad s on the left (unused) bits with 01 (no change groups) */
		1083	s |= 0x5555555555555555U << n << n;
		1084	/* "s shift right" */
		1085	sr = (s >> 1) & 0x5555555555555555U;
		1086	/* compute complement and swap info in two-bit groups */
		1087	cs = ((s & 0x5555555555555555U) + sr) ^ 0x5555555555555555U;
		1088
		1089	/* parallel prefix xor op to propagate both complement
		1090	* and swap info together from left to right (there is
		1091	* no step "cs ^= cs >> 1", so in effect it computes
		1092	* two independent parallel prefix operations on two
		1093	* interleaved sets of thirty-two bits).
		1094	*/
		1095	cs ^= cs >> 2;
		1096	cs ^= cs >> 4;
		1097	cs ^= cs >> 8;
		1098	cs ^= cs >> 16;
		1099	cs ^= cs >> 32;
		1100
		1101	/* separate swap and complement bits */
		1102	swap = cs & 0x5555555555555555U;
		1103	comp = (cs >> 1) & 0x5555555555555555U;
		1104
		1105	/* calculate coordinates in odd and even bit positions */
		1106	t = (s & swap) ^ comp;
		1107	s = s ^ sr ^ t ^ (t << 1);
		1108
		1109	/* unpad/clear out any junk on the left */
		1110	s = s & ((1 << n << n) - 1);
		1111
		1112	/* Now "unshuffle" to separate the x and y bits. */
		1113	t = (s ^ (s >> 1)) & 0x2222222222222222U; s ^= t ^ (t << 1);
		1114	t = (s ^ (s >> 2)) & 0x0c0c0c0c0c0c0c0cU; s ^= t ^ (t << 2);
		1115	t = (s ^ (s >> 4)) & 0x00f000f000f000f0U; s ^= t ^ (t << 4);
		1116	t = (s ^ (s >> 8)) & 0x0000ff000000ff00U; s ^= t ^ (t << 8);
		1117	t = (s ^ (s >> 16)) & 0x00000000ffff0000U; s ^= t ^ (t << 16);
		1118
		1119	/* now s contains two 32-bit coordinates */
		1120	return s;
		1121	}
		1122
		1123	/* algorithm from the book Hacker's Delight, but a similar algorithm*/
		1124	/* is given in https://doi.org/10.1002/spe.4380160103 */
		1125	/* this has been slightly improved over the original version */
		1126	ecb_function_ uint32_t
		1127	ecb_hilbert2d_coord_to_index32 (int n, uint32_t xy)
		1128	{
		1129	uint32_t row;
		1130	uint32_t state = 0;
		1131	uint32_t s = 0;
		1132
		1133	do
		1134	{
		1135	--n;
		1136
		1137	row = 4 * state
		1138	| (2 & (xy >> n >> 15))
		1139	| (1 & (xy >> n ));
		1140
		1141	/* these funky constants are lookup tables for two-bit values */
		1142	s = (s << 2) | (0x361e9cb4U >> 2 * row) & 3;
		1143	state = (0x8fe65831U >> 2 * row) & 3;
		1144	}
		1145	while (n > 0);
		1146
		1147	return s;
		1148	}
		1149
		1150	/* 64 bit, essentially the same as 32 bit */
		1151	ecb_function_ uint64_t
		1152	ecb_hilbert2d_coord_to_index64 (int n, uint64_t xy)
		1153	{
		1154	uint32_t row;
		1155	uint32_t state = 0;
		1156	uint64_t s = 0;
		1157
		1158	do
		1159	{
		1160	--n;
		1161
		1162	row = 4 * state
		1163	| (2 & (xy >> n >> 31))
		1164	| (1 & (xy >> n ));
		1165
		1166	/* these funky constants are lookup tables for two-bit values */
		1167	s = (s << 2) | (0x361e9cb4U >> 2 * row) & 3;
		1168	state = (0x8fe65831U >> 2 * row) & 3;
		1169	}
		1170	while (n > 0);
		1171
		1172	return s;
		1173	}
		1174
		1175	/*****************************************************************************/
		1176	/* division */
340		1177
341	#if ECB_GCC_VERSION(3,0) || ECB_C99	1178	#if ECB_GCC_VERSION(3,0) || ECB_C99
		1179	/* C99 tightened the definition of %, so we can use a more efficient version */
342	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))	1180	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
343	#else	1181	#else
344	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))	1182	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
345	#endif	1183	#endif
		1184
		1185	#if ECB_CPP
		1186	template<typename T>
		1187	static inline T ecb_div_rd (T val, T div)
		1188	{
		1189	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
		1190	}
		1191	template<typename T>
		1192	static inline T ecb_div_ru (T val, T div)
		1193	{
		1194	return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
		1195	}
		1196	#else
		1197	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
		1198	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
		1199	#endif
		1200
		1201	/*****************************************************************************/
		1202	/* array length */
346		1203
347	#if ecb_cplusplus_does_not_suck	1204	#if ecb_cplusplus_does_not_suck
348	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */	1205	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
349	template<typename T, int N>	1206	template<typename T, int N>
350	static inline int ecb_array_length (const T (&arr)[N])	1207	static inline int ecb_array_length (const T (&arr)[N])
…		…
353	}	1210	}
354	#else	1211	#else
355	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	1212	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
356	#endif	1213	#endif
357		1214
		1215	/*****************************************************************************/
		1216	/* IEEE 754-2008 half float conversions */
		1217
		1218	ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
		1219	ecb_function_ ecb_const uint32_t
		1220	ecb_binary16_to_binary32 (uint32_t x)
		1221	{
		1222	unsigned int s = (x & 0x8000) << (31 - 15);
		1223	int e = (x >> 10) & 0x001f;
		1224	unsigned int m = x & 0x03ff;
		1225
		1226	if (ecb_expect_false (e == 31))
		1227	/* infinity or NaN */
		1228	e = 255 - (127 - 15);
		1229	else if (ecb_expect_false (!e))
		1230	{
		1231	if (ecb_expect_true (!m))
		1232	/* zero, handled by code below by forcing e to 0 */
		1233	e = 0 - (127 - 15);
		1234	else
		1235	{
		1236	/* subnormal, renormalise */
		1237	unsigned int s = 10 - ecb_ld32 (m);
		1238
		1239	m = (m << s) & 0x3ff; /* mask implicit bit */
		1240	e -= s - 1;
		1241	}
		1242	}
		1243
		1244	/* e and m now are normalised, or zero, (or inf or nan) */
		1245	e += 127 - 15;
		1246
		1247	return s | (e << 23) | (m << (23 - 10));
		1248	}
		1249
		1250	ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
		1251	ecb_function_ ecb_const uint16_t
		1252	ecb_binary32_to_binary16 (uint32_t x)
		1253	{
		1254	unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
		1255	int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
		1256	unsigned int m = x & 0x007fffff;
		1257
		1258	x &= 0x7fffffff;
		1259
		1260	/* if it's within range of binary16 normals, use fast path */
		1261	if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
		1262	{
		1263	/* mantissa round-to-even */
		1264	m += 0x00000fff + ((m >> (23 - 10)) & 1);
		1265
		1266	/* handle overflow */
		1267	if (ecb_expect_false (m >= 0x00800000))
		1268	{
		1269	m >>= 1;
		1270	e += 1;
		1271	}
		1272
		1273	return s | (e << 10) | (m >> (23 - 10));
		1274	}
		1275
		1276	/* handle large numbers and infinity */
		1277	if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
		1278	return s | 0x7c00;
		1279
		1280	/* handle zero, subnormals and small numbers */
		1281	if (ecb_expect_true (x < 0x38800000))
		1282	{
		1283	/* zero */
		1284	if (ecb_expect_true (!x))
		1285	return s;
		1286
		1287	/* handle subnormals */
		1288
		1289	/* too small, will be zero */
		1290	if (e < (14 - 24)) /* might not be sharp, but is good enough */
		1291	return s;
		1292
		1293	m |= 0x00800000; /* make implicit bit explicit */
		1294
		1295	/* very tricky - we need to round to the nearest e (+10) bit value */
		1296	{
		1297	unsigned int bits = 14 - e;
		1298	unsigned int half = (1 << (bits - 1)) - 1;
		1299	unsigned int even = (m >> bits) & 1;
		1300
		1301	/* if this overflows, we will end up with a normalised number */
		1302	m = (m + half + even) >> bits;
		1303	}
		1304
		1305	return s | m;
		1306	}
		1307
		1308	/* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
		1309	m >>= 13;
		1310
		1311	return s | 0x7c00 | m | !m;
		1312	}
		1313
		1314	/*******************************************************************************/
		1315	/* fast integer to ascii */
		1316
		1317	/*
		1318	* This code is pretty complicated because it is general. The idea behind it,
		1319	* however, is pretty simple: first, the number is multiplied with a scaling
		1320	* factor (2**bits / 10**(digits-1)) to convert the integer into a fixed-point
		1321	* number with the first digit in the upper bits.
		1322	* Then this digit is converted to text and masked out. The resulting number
		1323	* is then multiplied by 10, by multiplying the fixed point representation
		1324	* by 5 and shifting the (binary) decimal point one to the right, so a 4.28
		1325	* format becomes 5.27, 6.26 and so on.
		1326	* The rest involves only advancing the pointer if we already generated a
		1327	* non-zero digit, so leading zeroes are overwritten.
		1328	*/
		1329
		1330	/* simply return a mask with "bits" bits set */
		1331	#define ecb_i2a_mask(type,bits) ((((type)1) << (bits)) - 1)
		1332
		1333	/* oputput a single digit. maskvalue is 10**digitidx */
		1334	#define ecb_i2a_digit(type,bits,digitmask,maskvalue,digitidx) \
		1335	if (digitmask >= maskvalue) /* constant, used to decide how many digits to generate */ \
		1336	{ \
		1337	char digit = x >> (bits - digitidx); /* calculate the topmost digit */ \
		1338	*ptr = digit + '0'; /* output it */ \
		1339	nz = (digitmask == maskvalue) || nz || digit; /* first term == always output last digit */ \
		1340	ptr += nz; /* output digit only if non-zero digit seen */ \
		1341	x = (x & ecb_i2a_mask (type, bits - digitidx)) * 5; /* *10, but shift decimal point right */ \
		1342	}
		1343
		1344	/* convert integer to fixed point format and multiply out digits, highest first */
		1345	/* requires magic constants: max. digits and number of bits after the decimal point */
		1346	#define ecb_i2a_def(suffix,ptr,v,type,bits,digitmask,lz) \
		1347	ecb_inline char *ecb_i2a_ ## suffix (char *ptr, uint32_t u) \
		1348	{ \
		1349	char nz = lz; /* non-zero digit seen? */ \
		1350	/* convert to x.bits fixed-point */ \
		1351	type x = u * ((ecb_i2a_mask (type, bits) + digitmask) / digitmask); \
		1352	/* output up to 10 digits */ \
		1353	ecb_i2a_digit (type,bits,digitmask, 1, 0); \
		1354	ecb_i2a_digit (type,bits,digitmask, 10, 1); \
		1355	ecb_i2a_digit (type,bits,digitmask, 100, 2); \
		1356	ecb_i2a_digit (type,bits,digitmask, 1000, 3); \
		1357	ecb_i2a_digit (type,bits,digitmask, 10000, 4); \
		1358	ecb_i2a_digit (type,bits,digitmask, 100000, 5); \
		1359	ecb_i2a_digit (type,bits,digitmask, 1000000, 6); \
		1360	ecb_i2a_digit (type,bits,digitmask, 10000000, 7); \
		1361	ecb_i2a_digit (type,bits,digitmask, 100000000, 8); \
		1362	ecb_i2a_digit (type,bits,digitmask, 1000000000, 9); \
		1363	return ptr; \
		1364	}
		1365
		1366	/* predefined versions of the above, for various digits */
		1367	/* ecb_i2a_xN = almost N digits, limit defined by macro */
		1368	/* ecb_i2a_N = up to N digits, leading zeroes suppressed */
		1369	/* ecb_i2a_0N = exactly N digits, including leading zeroes */
		1370
		1371	/* non-leading-zero versions, limited range */
		1372	#define ECB_I2A_MAX_X5 59074 /* limit for ecb_i2a_x5 */
		1373	#define ECB_I2A_MAX_X10 2932500665 /* limit for ecb_i2a_x10 */
		1374	ecb_i2a_def ( x5, ptr, v, uint32_t, 26, 10000, 0)
		1375	ecb_i2a_def (x10, ptr, v, uint64_t, 60, 1000000000, 0)
		1376
		1377	/* non-leading zero versions, all digits, 4 and 9 are optimal for 32/64 bit */
		1378	ecb_i2a_def ( 2, ptr, v, uint32_t, 10, 10, 0)
		1379	ecb_i2a_def ( 3, ptr, v, uint32_t, 12, 100, 0)
		1380	ecb_i2a_def ( 4, ptr, v, uint32_t, 26, 1000, 0)
		1381	ecb_i2a_def ( 5, ptr, v, uint64_t, 30, 10000, 0)
		1382	ecb_i2a_def ( 6, ptr, v, uint64_t, 36, 100000, 0)
		1383	ecb_i2a_def ( 7, ptr, v, uint64_t, 44, 1000000, 0)
		1384	ecb_i2a_def ( 8, ptr, v, uint64_t, 50, 10000000, 0)
		1385	ecb_i2a_def ( 9, ptr, v, uint64_t, 56, 100000000, 0)
		1386
		1387	/* leading-zero versions, all digits, 04 and 09 are optimal for 32/64 bit */
		1388	ecb_i2a_def (02, ptr, v, uint32_t, 10, 10, 1)
		1389	ecb_i2a_def (03, ptr, v, uint32_t, 12, 100, 1)
		1390	ecb_i2a_def (04, ptr, v, uint32_t, 26, 1000, 1)
		1391	ecb_i2a_def (05, ptr, v, uint64_t, 30, 10000, 1)
		1392	ecb_i2a_def (06, ptr, v, uint64_t, 36, 100000, 1)
		1393	ecb_i2a_def (07, ptr, v, uint64_t, 44, 1000000, 1)
		1394	ecb_i2a_def (08, ptr, v, uint64_t, 50, 10000000, 1)
		1395	ecb_i2a_def (09, ptr, v, uint64_t, 56, 100000000, 1)
		1396
		1397	#define ECB_I2A_I32_DIGITS 11
		1398	#define ECB_I2A_U32_DIGITS 10
		1399	#define ECB_I2A_I64_DIGITS 20
		1400	#define ECB_I2A_U64_DIGITS 21
		1401	#define ECB_I2A_MAX_DIGITS 21
		1402
		1403	ecb_inline char *
		1404	ecb_i2a_u32 (char *ptr, uint32_t u)
		1405	{
		1406	#if ECB_64BIT_NATIVE
		1407	if (ecb_expect_true (u <= ECB_I2A_MAX_X10))
		1408	ptr = ecb_i2a_x10 (ptr, u);
		1409	else /* x10 almost, but not fully, covers 32 bit */
		1410	{
		1411	uint32_t u1 = u % 1000000000;
		1412	uint32_t u2 = u / 1000000000;
		1413
		1414	*ptr++ = u2 + '0';
		1415	ptr = ecb_i2a_09 (ptr, u1);
		1416	}
		1417	#else
		1418	if (ecb_expect_true (u <= ECB_I2A_MAX_X5))
		1419	ecb_i2a_x5 (ptr, u);
		1420	else if (ecb_expect_true (u <= ECB_I2A_MAX_X5 * 10000))
		1421	{
		1422	uint32_t u1 = u % 10000;
		1423	uint32_t u2 = u / 10000;
		1424
		1425	ptr = ecb_i2a_x5 (ptr, u2);
		1426	ptr = ecb_i2a_04 (ptr, u1);
		1427	}
		1428	else
		1429	{
		1430	uint32_t u1 = u % 10000;
		1431	uint32_t ua = u / 10000;
		1432	uint32_t u2 = ua % 10000;
		1433	uint32_t u3 = ua / 10000;
		1434
		1435	ptr = ecb_i2a_2 (ptr, u3);
		1436	ptr = ecb_i2a_04 (ptr, u2);
		1437	ptr = ecb_i2a_04 (ptr, u1);
		1438	}
358	#endif	1439	#endif
359		1440
		1441	return ptr;
		1442	}
		1443
		1444	ecb_inline char *
		1445	ecb_i2a_i32 (char *ptr, int32_t v)
		1446	{
		1447	*ptr = '-'; ptr += v < 0;
		1448	uint32_t u = v < 0 ? -(uint32_t)v : v;
		1449
		1450	#if ECB_64BIT_NATIVE
		1451	ptr = ecb_i2a_x10 (ptr, u); /* x10 fully covers 31 bit */
		1452	#else
		1453	ptr = ecb_i2a_u32 (ptr, u);
		1454	#endif
		1455
		1456	return ptr;
		1457	}
		1458
		1459	ecb_inline char *
		1460	ecb_i2a_u64 (char *ptr, uint64_t u)
		1461	{
		1462	#if ECB_64BIT_NATIVE
		1463	if (ecb_expect_true (u <= ECB_I2A_MAX_X10))
		1464	ptr = ecb_i2a_x10 (ptr, u);
		1465	else if (ecb_expect_false (u <= ECB_I2A_MAX_X10 * 1000000000))
		1466	{
		1467	uint64_t u1 = u % 1000000000;
		1468	uint64_t u2 = u / 1000000000;
		1469
		1470	ptr = ecb_i2a_x10 (ptr, u2);
		1471	ptr = ecb_i2a_09 (ptr, u1);
		1472	}
		1473	else
		1474	{
		1475	uint64_t u1 = u % 1000000000;
		1476	uint64_t ua = u / 1000000000;
		1477	uint64_t u2 = ua % 1000000000;
		1478	uint64_t u3 = ua / 1000000000;
		1479
		1480	ptr = ecb_i2a_2 (ptr, u3);
		1481	ptr = ecb_i2a_09 (ptr, u2);
		1482	ptr = ecb_i2a_09 (ptr, u1);
		1483	}
		1484	#else
		1485	if (ecb_expect_true (u <= ECB_I2A_MAX_X5))
		1486	ptr = ecb_i2a_x5 (ptr, u);
		1487	else
		1488	{
		1489	uint64_t u1 = u % 10000;
		1490	uint64_t u2 = u / 10000;
		1491
		1492	ptr = ecb_i2a_u64 (ptr, u2);
		1493	ptr = ecb_i2a_04 (ptr, u1);
		1494	}
		1495	#endif
		1496
		1497	return ptr;
		1498	}
		1499
		1500	ecb_inline char *
		1501	ecb_i2a_i64 (char *ptr, int64_t v)
		1502	{
		1503	*ptr = '-'; ptr += v < 0;
		1504	uint64_t u = v < 0 ? -(uint64_t)v : v;
		1505
		1506	#if ECB_64BIT_NATIVE
		1507	if (ecb_expect_true (u <= ECB_I2A_MAX_X10))
		1508	ptr = ecb_i2a_x10 (ptr, u);
		1509	else if (ecb_expect_false (u <= ECB_I2A_MAX_X10 * 1000000000))
		1510	{
		1511	uint64_t u1 = u % 1000000000;
		1512	uint64_t u2 = u / 1000000000;
		1513
		1514	ptr = ecb_i2a_x10 (ptr, u2);
		1515	ptr = ecb_i2a_09 (ptr, u1);
		1516	}
		1517	else
		1518	{
		1519	uint64_t u1 = u % 1000000000;
		1520	uint64_t ua = u / 1000000000;
		1521	uint64_t u2 = ua % 1000000000;
		1522	uint64_t u3 = ua / 1000000000;
		1523
		1524	/* 2**31 is 19 digits, so the top is exactly one digit */
		1525	*ptr++ = u3 + '0';
		1526	ptr = ecb_i2a_09 (ptr, u2);
		1527	ptr = ecb_i2a_09 (ptr, u1);
		1528	}
		1529	#else
		1530	ptr = ecb_i2a_u64 (ptr, u);
		1531	#endif
		1532
		1533	return ptr;
		1534	}
		1535
		1536	/*******************************************************************************/
		1537	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
		1538
		1539	/* basically, everything uses "ieee pure-endian" floating point numbers */
		1540	/* the only noteworthy exception is ancient armle, which uses order 43218765 */
		1541	#if 0 \
		1542	|| __i386 || __i386__ \
		1543	|| ECB_GCC_AMD64 \
		1544	|| __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
		1545	|| defined __s390__ || defined __s390x__ \
		1546	|| defined __mips__ \
		1547	|| defined __alpha__ \
		1548	|| defined __hppa__ \
		1549	|| defined __ia64__ \
		1550	|| defined __m68k__ \
		1551	|| defined __m88k__ \
		1552	|| defined __sh__ \
		1553	|| defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
		1554	|| (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
		1555	|| defined __aarch64__
		1556	#define ECB_STDFP 1
		1557	#else
		1558	#define ECB_STDFP 0
		1559	#endif
		1560
		1561	#ifndef ECB_NO_LIBM
		1562
		1563	#include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
		1564
		1565	/* only the oldest of old doesn't have this one. solaris. */
		1566	#ifdef INFINITY
		1567	#define ECB_INFINITY INFINITY
		1568	#else
		1569	#define ECB_INFINITY HUGE_VAL
		1570	#endif
		1571
		1572	#ifdef NAN
		1573	#define ECB_NAN NAN
		1574	#else
		1575	#define ECB_NAN ECB_INFINITY
		1576	#endif
		1577
		1578	#if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
		1579	#define ecb_ldexpf(x,e) ldexpf ((x), (e))
		1580	#define ecb_frexpf(x,e) frexpf ((x), (e))
		1581	#else
		1582	#define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
		1583	#define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
		1584	#endif
		1585
		1586	/* convert a float to ieee single/binary32 */
		1587	ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
		1588	ecb_function_ ecb_const uint32_t
		1589	ecb_float_to_binary32 (float x)
		1590	{
		1591	uint32_t r;
		1592
		1593	#if ECB_STDFP
		1594	memcpy (&r, &x, 4);
		1595	#else
		1596	/* slow emulation, works for anything but -0 */
		1597	uint32_t m;
		1598	int e;
		1599
		1600	if (x == 0e0f ) return 0x00000000U;
		1601	if (x > +3.40282346638528860e+38f) return 0x7f800000U;
		1602	if (x < -3.40282346638528860e+38f) return 0xff800000U;
		1603	if (x != x ) return 0x7fbfffffU;
		1604
		1605	m = ecb_frexpf (x, &e) * 0x1000000U;
		1606
		1607	r = m & 0x80000000U;
		1608
		1609	if (r)
		1610	m = -m;
		1611
		1612	if (e <= -126)
		1613	{
		1614	m &= 0xffffffU;
		1615	m >>= (-125 - e);
		1616	e = -126;
		1617	}
		1618
		1619	r |= (e + 126) << 23;
		1620	r |= m & 0x7fffffU;
		1621	#endif
		1622
		1623	return r;
		1624	}
		1625
		1626	/* converts an ieee single/binary32 to a float */
		1627	ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
		1628	ecb_function_ ecb_const float
		1629	ecb_binary32_to_float (uint32_t x)
		1630	{
		1631	float r;
		1632
		1633	#if ECB_STDFP
		1634	memcpy (&r, &x, 4);
		1635	#else
		1636	/* emulation, only works for normals and subnormals and +0 */
		1637	int neg = x >> 31;
		1638	int e = (x >> 23) & 0xffU;
		1639
		1640	x &= 0x7fffffU;
		1641
		1642	if (e)
		1643	x |= 0x800000U;
		1644	else
		1645	e = 1;
		1646
		1647	/* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
		1648	r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
		1649
		1650	r = neg ? -r : r;
		1651	#endif
		1652
		1653	return r;
		1654	}
		1655
		1656	/* convert a double to ieee double/binary64 */
		1657	ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
		1658	ecb_function_ ecb_const uint64_t
		1659	ecb_double_to_binary64 (double x)
		1660	{
		1661	uint64_t r;
		1662
		1663	#if ECB_STDFP
		1664	memcpy (&r, &x, 8);
		1665	#else
		1666	/* slow emulation, works for anything but -0 */
		1667	uint64_t m;
		1668	int e;
		1669
		1670	if (x == 0e0 ) return 0x0000000000000000U;
		1671	if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
		1672	if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
		1673	if (x != x ) return 0X7ff7ffffffffffffU;
		1674
		1675	m = frexp (x, &e) * 0x20000000000000U;
		1676
		1677	r = m & 0x8000000000000000;;
		1678
		1679	if (r)
		1680	m = -m;
		1681
		1682	if (e <= -1022)
		1683	{
		1684	m &= 0x1fffffffffffffU;
		1685	m >>= (-1021 - e);
		1686	e = -1022;
		1687	}
		1688
		1689	r |= ((uint64_t)(e + 1022)) << 52;
		1690	r |= m & 0xfffffffffffffU;
		1691	#endif
		1692
		1693	return r;
		1694	}
		1695
		1696	/* converts an ieee double/binary64 to a double */
		1697	ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
		1698	ecb_function_ ecb_const double
		1699	ecb_binary64_to_double (uint64_t x)
		1700	{
		1701	double r;
		1702
		1703	#if ECB_STDFP
		1704	memcpy (&r, &x, 8);
		1705	#else
		1706	/* emulation, only works for normals and subnormals and +0 */
		1707	int neg = x >> 63;
		1708	int e = (x >> 52) & 0x7ffU;
		1709
		1710	x &= 0xfffffffffffffU;
		1711
		1712	if (e)
		1713	x |= 0x10000000000000U;
		1714	else
		1715	e = 1;
		1716
		1717	/* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
		1718	r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
		1719
		1720	r = neg ? -r : r;
		1721	#endif
		1722
		1723	return r;
		1724	}
		1725
		1726	/* convert a float to ieee half/binary16 */
		1727	ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
		1728	ecb_function_ ecb_const uint16_t
		1729	ecb_float_to_binary16 (float x)
		1730	{
		1731	return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
		1732	}
		1733
		1734	/* convert an ieee half/binary16 to float */
		1735	ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
		1736	ecb_function_ ecb_const float
		1737	ecb_binary16_to_float (uint16_t x)
		1738	{
		1739	return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
		1740	}
		1741
		1742	#endif
		1743
		1744	#endif
		1745

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