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Comparing libecb/ecb.h (file contents):
Revision 1.146 by root, Fri Oct 17 11:07:14 2014 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 (©) 2009-2014 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:
…		…
40		40
41	#ifndef ECB_H	41	#ifndef ECB_H
42	#define ECB_H	42	#define ECB_H
43		43
44	/* 16 bits major, 16 bits minor */	44	/* 16 bits major, 16 bits minor */
45	#define ECB_VERSION 0x00010004	45	#define ECB_VERSION 0x0001000c
46		46
47	#ifdef _WIN32	47	#include <string.h> /* for memcpy */
		48
		49	#if defined (_WIN32) && !defined (__MINGW32__)
48	typedef signed char int8_t;	50	typedef signed char int8_t;
49	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;
50	typedef signed short int16_t;	54	typedef signed short int16_t;
51	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;
52	typedef signed int int32_t;	58	typedef signed int int32_t;
53	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;
54	#if __GNUC__	62	#if __GNUC__
55	typedef signed long long int64_t;	63	typedef signed long long int64_t;
56	typedef unsigned long long uint64_t;	64	typedef unsigned long long uint64_t;
57	#else /* _MSC_VER || __BORLANDC__ */	65	#else /* _MSC_VER || __BORLANDC__ */
58	typedef signed __int64 int64_t;	66	typedef signed __int64 int64_t;
59	typedef unsigned __int64 uint64_t;	67	typedef unsigned __int64 uint64_t;
60	#endif	68	#endif
		69	typedef int64_t int_fast64_t;
		70	typedef uint64_t uint_fast64_t;
61	#ifdef _WIN64	71	#ifdef _WIN64
62	#define ECB_PTRSIZE 8	72	#define ECB_PTRSIZE 8
63	typedef uint64_t uintptr_t;	73	typedef uint64_t uintptr_t;
64	typedef int64_t intptr_t;	74	typedef int64_t intptr_t;
65	#else	75	#else
…		…
67	typedef uint32_t uintptr_t;	77	typedef uint32_t uintptr_t;
68	typedef int32_t intptr_t;	78	typedef int32_t intptr_t;
69	#endif	79	#endif
70	#else	80	#else
71	#include <inttypes.h>	81	#include <inttypes.h>
72	#if UINTMAX_MAX > 0xffffffffU	82	#if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
73	#define ECB_PTRSIZE 8	83	#define ECB_PTRSIZE 8
74	#else	84	#else
75	#define ECB_PTRSIZE 4	85	#define ECB_PTRSIZE 4
76	#endif	86	#endif
77	#endif	87	#endif
78		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
79	/* work around x32 idiocy by defining proper macros */	100	/* work around x32 idiocy by defining proper macros */
80	#if __amd64 || __x86_64 || _M_AMD64 || _M_X64	101	#if ECB_GCC_AMD64 || ECB_MSVC_AMD64
81	#if _ILP32	102	#if _ILP32
82	#define ECB_AMD64_X32 1	103	#define ECB_AMD64_X32 1
83	#else	104	#else
84	#define ECB_AMD64 1	105	#define ECB_AMD64 1
85	#endif	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
86	#endif	113	#endif
87		114
88	/* many compilers define _GNUC_ to some versions but then only implement	115	/* many compilers define _GNUC_ to some versions but then only implement
89	* what their idiot authors think are the "more important" extensions,	116	* what their idiot authors think are the "more important" extensions,
90	* causing enormous grief in return for some better fake benchmark numbers.	117	* causing enormous grief in return for some better fake benchmark numbers.
…		…
98	#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)))
99	#endif	126	#endif
100		127
101	#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))	128	#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
102		129
103	#if __clang__ && defined(__has_builtin)	130	#if __clang__ && defined __has_builtin
104	#define ECB_CLANG_BUILTIN(x) __has_builtin(x)	131	#define ECB_CLANG_BUILTIN(x) __has_builtin (x)
105	#else	132	#else
106	#define ECB_CLANG_BUILTIN(x) 0	133	#define ECB_CLANG_BUILTIN(x) 0
107	#endif	134	#endif
108		135
109	#if __clang__ && defined(__has_extension)	136	#if __clang__ && defined __has_extension
110	#define ECB_CLANG_EXTENSION(x) __has_extension(x)	137	#define ECB_CLANG_EXTENSION(x) __has_extension (x)
111	#else	138	#else
112	#define ECB_CLANG_EXTENSION(x) 0	139	#define ECB_CLANG_EXTENSION(x) 0
113	#endif	140	#endif
114		141
115	#define ECB_CPP (__cplusplus+0)	142	#define ECB_CPP (__cplusplus+0)
116	#define ECB_CPP11 (__cplusplus >= 201103L)	143	#define ECB_CPP11 (__cplusplus >= 201103L)
		144	#define ECB_CPP14 (__cplusplus >= 201402L)
		145	#define ECB_CPP17 (__cplusplus >= 201703L)
117		146
118	#if ECB_CPP	147	#if ECB_CPP
119	#define ECB_C 0	148	#define ECB_C 0
120	#define ECB_STDC_VERSION 0	149	#define ECB_STDC_VERSION 0
121	#else	150	#else
…		…
123	#define ECB_STDC_VERSION __STDC_VERSION__	152	#define ECB_STDC_VERSION __STDC_VERSION__
124	#endif	153	#endif
125		154
126	#define ECB_C99 (ECB_STDC_VERSION >= 199901L)	155	#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
127	#define ECB_C11 (ECB_STDC_VERSION >= 201112L)	156	#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
		157	#define ECB_C17 (ECB_STDC_VERSION >= 201710L)
128		158
129	#if ECB_CPP	159	#if ECB_CPP
130	#define ECB_EXTERN_C extern "C"	160	#define ECB_EXTERN_C extern "C"
131	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {	161	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {
132	#define ECB_EXTERN_C_END }	162	#define ECB_EXTERN_C_END }
…		…
147		177
148	#if ECB_NO_SMP	178	#if ECB_NO_SMP
149	#define ECB_MEMORY_FENCE do { } while (0)	179	#define ECB_MEMORY_FENCE do { } while (0)
150	#endif	180	#endif
151		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
152	#ifndef ECB_MEMORY_FENCE	191	#ifndef ECB_MEMORY_FENCE
153	#if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110	192	#if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
		193	#define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory")
154	#if __i386 || __i386__	194	#if __i386 || __i386__
155	#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")
156	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")	196	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
157	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")	197	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
158	#elif __amd64 || __amd64__ || __x86_64 || __x86_64__	198	#elif ECB_GCC_AMD64
159	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")	199	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
160	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")	200	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
161	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")	201	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
162	#elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__	202	#elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
163	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")	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 */
164	#elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \	211	#elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
165	|| defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__	212	|| defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
		213	|| defined __ARM_ARCH_6T2__
166	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")	214	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
167	#elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \	215	#elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
168	|| defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__	216	|| defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
169	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")	217	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
170	#elif __aarch64__	218	#elif __aarch64__
171	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")	219	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
172	#elif (__sparc || __sparc__) && !__sparcv8	220	#elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
173	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")	221	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
174	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")	222	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
175	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")	223	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
176	#elif defined __s390__ || defined __s390x__	224	#elif defined __s390__ || defined __s390x__
177	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")	225	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
…		…
200	#if ECB_GCC_VERSION(4,7)	248	#if ECB_GCC_VERSION(4,7)
201	/* see comment below (stdatomic.h) about the C11 memory model. */	249	/* see comment below (stdatomic.h) about the C11 memory model. */
202	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)	250	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
203	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)	251	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
204	#define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)	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)
205		255
206	#elif ECB_CLANG_EXTENSION(c_atomic)	256	#elif ECB_CLANG_EXTENSION(c_atomic)
207	/* see comment below (stdatomic.h) about the C11 memory model. */	257	/* see comment below (stdatomic.h) about the C11 memory model. */
208	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)	258	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
209	#define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)	259	#define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
210	#define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)	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)
211		263
212	#elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__	264	#elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
213	#define ECB_MEMORY_FENCE __sync_synchronize ()	265	#define ECB_MEMORY_FENCE __sync_synchronize ()
214	#elif _MSC_VER >= 1500 /* VC++ 2008 */	266	#elif _MSC_VER >= 1500 /* VC++ 2008 */
215	/* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */	267	/* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
…		…
225	#elif defined _WIN32	277	#elif defined _WIN32
226	#include <WinNT.h>	278	#include <WinNT.h>
227	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */	279	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
228	#elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110	280	#elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
229	#include <mbarrier.h>	281	#include <mbarrier.h>
230	#define ECB_MEMORY_FENCE __machine_rw_barrier ()	282	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
231	#define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()	283	#define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier ()
232	#define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()	284	#define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier ()
		285	#define ECB_MEMORY_FENCE_RELAXED __compiler_barrier ()
233	#elif __xlC__	286	#elif __xlC__
234	#define ECB_MEMORY_FENCE __sync ()	287	#define ECB_MEMORY_FENCE __sync ()
235	#endif	288	#endif
236	#endif	289	#endif
237		290
238	#ifndef ECB_MEMORY_FENCE	291	#ifndef ECB_MEMORY_FENCE
239	#if ECB_C11 && !defined __STDC_NO_ATOMICS__	292	#if ECB_C11 && !defined __STDC_NO_ATOMICS__
240	/* we assume that these memory fences work on all variables/all memory accesses, */	293	/* we assume that these memory fences work on all variables/all memory accesses, */
241	/* not just C11 atomics and atomic accesses */	294	/* not just C11 atomics and atomic accesses */
242	#include <stdatomic.h>	295	#include <stdatomic.h>
243	/* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
244	/* any fence other than seq_cst, which isn't very efficient for us. */
245	/* Why that is, we don't know - either the C11 memory model is quite useless */
246	/* for most usages, or gcc and clang have a bug */
247	/* I *currently* lean towards the latter, and inefficiently implement */
248	/* all three of ecb's fences as a seq_cst fence */
249	/* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
250	/* for all __atomic_thread_fence's except seq_cst */
251	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)	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)
252	#endif	299	#endif
253	#endif	300	#endif
254		301
255	#ifndef ECB_MEMORY_FENCE	302	#ifndef ECB_MEMORY_FENCE
256	#if !ECB_AVOID_PTHREADS	303	#if !ECB_AVOID_PTHREADS
…		…
276		323
277	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE	324	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
278	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE	325	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
279	#endif	326	#endif
280		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
281	/*****************************************************************************/	332	/*****************************************************************************/
282		333
283	#if __cplusplus	334	#if ECB_CPP
284	#define ecb_inline static inline	335	#define ecb_inline static inline
285	#elif ECB_GCC_VERSION(2,5)	336	#elif ECB_GCC_VERSION(2,5)
286	#define ecb_inline static __inline__	337	#define ecb_inline static __inline__
287	#elif ECB_C99	338	#elif ECB_C99
288	#define ecb_inline static inline	339	#define ecb_inline static inline
…		…
302		353
303	#define ECB_CONCAT_(a, b) a ## b	354	#define ECB_CONCAT_(a, b) a ## b
304	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	355	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
305	#define ECB_STRINGIFY_(a) # a	356	#define ECB_STRINGIFY_(a) # a
306	#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))
307		359
308	#define ecb_function_ ecb_inline	360	#define ecb_function_ ecb_inline
309		361
310	#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)	362	#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
311	#define ecb_attribute(attrlist) __attribute__ (attrlist)	363	#define ecb_attribute(attrlist) __attribute__ (attrlist)
…		…
343	#elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)	395	#elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
344	#define ecb_decltype(x) __typeof__ (x)	396	#define ecb_decltype(x) __typeof__ (x)
345	#endif	397	#endif
346		398
347	#if _MSC_VER >= 1300	399	#if _MSC_VER >= 1300
348	#define ecb_deprecated __declspec(deprecated)	400	#define ecb_deprecated __declspec (deprecated)
349	#else	401	#else
350	#define ecb_deprecated ecb_attribute ((__deprecated__))	402	#define ecb_deprecated ecb_attribute ((__deprecated__))
351	#endif	403	#endif
352		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
353	#define ecb_noinline ecb_attribute ((__noinline__))	416	#define ecb_noinline ecb_attribute ((__noinline__))
		417	#endif
		418
354	#define ecb_unused ecb_attribute ((__unused__))	419	#define ecb_unused ecb_attribute ((__unused__))
355	#define ecb_const ecb_attribute ((__const__))	420	#define ecb_const ecb_attribute ((__const__))
356	#define ecb_pure ecb_attribute ((__pure__))	421	#define ecb_pure ecb_attribute ((__pure__))
357		422
358	/* TODO http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx __declspec(noreturn) */
359	#if ECB_C11 || __IBMC_NORETURN	423	#if ECB_C11 || __IBMC_NORETURN
360	/* http://pic.dhe.ibm.com/infocenter/compbg/v121v141/topic/com.ibm.xlcpp121.bg.doc/language_ref/noreturn.html */	424	/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
361	#define ecb_noreturn _Noreturn	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)
362	#else	431	#else
363	#define ecb_noreturn ecb_attribute ((__noreturn__))	432	#define ecb_noreturn ecb_attribute ((__noreturn__))
364	#endif	433	#endif
365		434
366	#if ECB_GCC_VERSION(4,3)	435	#if ECB_GCC_VERSION(4,3)
…		…
385	/* count trailing zero bits and count # of one bits */	454	/* count trailing zero bits and count # of one bits */
386	#if ECB_GCC_VERSION(3,4) \	455	#if ECB_GCC_VERSION(3,4) \
387	|| (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \	456	|| (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
388	&& ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \	457	&& ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
389	&& ECB_CLANG_BUILTIN(__builtin_popcount))	458	&& ECB_CLANG_BUILTIN(__builtin_popcount))
390	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
391	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
392	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
393	#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))
394	#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)
395	#define ecb_popcount32(x) __builtin_popcount (x)	465	#define ecb_popcount32(x) __builtin_popcount (x)
396	/* no popcountll */	466	/* ecb_popcount64 is more difficult, see below */
397	#else	467	#else
398	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;	468	ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
399	ecb_function_ int	469	ecb_function_ ecb_const int
400	ecb_ctz32 (uint32_t x)	470	ecb_ctz32 (uint32_t x)
401	{	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
402	int r = 0;	477	int r;
403		478
404	x &= ~x + 1; /* this isolates the lowest bit */	479	x &= ~x + 1; /* this isolates the lowest bit */
405		480
406	#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;
407	r += !!(x & 0xaaaaaaaa) << 0;	500	r += !!(x & 0xaaaaaaaa) << 0;
408	r += !!(x & 0xcccccccc) << 1;	501	r += !!(x & 0xcccccccc) << 1;
409	r += !!(x & 0xf0f0f0f0) << 2;	502	r += !!(x & 0xf0f0f0f0) << 2;
410	r += !!(x & 0xff00ff00) << 3;	503	r += !!(x & 0xff00ff00) << 3;
411	r += !!(x & 0xffff0000) << 4;	504	r += !!(x & 0xffff0000) << 4;
412	#else	505	#else /* branchless on modern compilers, typically */
		506	r = 0;
413	if (x & 0xaaaaaaaa) r += 1;	507	if (x & 0xaaaaaaaa) r += 1;
414	if (x & 0xcccccccc) r += 2;	508	if (x & 0xcccccccc) r += 2;
415	if (x & 0xf0f0f0f0) r += 4;	509	if (x & 0xf0f0f0f0) r += 4;
416	if (x & 0xff00ff00) r += 8;	510	if (x & 0xff00ff00) r += 8;
417	if (x & 0xffff0000) r += 16;	511	if (x & 0xffff0000) r += 16;
418	#endif	512	#endif
419		513
420	return r;	514	return r;
		515	#endif
421	}	516	}
422		517
423	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;	518	ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
424	ecb_function_ int	519	ecb_function_ ecb_const int
425	ecb_ctz64 (uint64_t x)	520	ecb_ctz64 (uint64_t x)
426	{	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
427	int shift = x & 0xffffffffU ? 0 : 32;	527	int shift = x & 0xffffffff ? 0 : 32;
428	return ecb_ctz32 (x >> shift) + shift;	528	return ecb_ctz32 (x >> shift) + shift;
		529	#endif
429	}	530	}
430		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
431	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;	583	ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
432	ecb_function_ int	584	ecb_function_ ecb_const int
433	ecb_popcount32 (uint32_t x)	585	ecb_popcount32 (uint32_t x)
434	{	586	{
435	x -= (x >> 1) & 0x55555555;	587	x -= (x >> 1) & 0x55555555;
436	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);	588	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
437	x = ((x >> 4) + x) & 0x0f0f0f0f;	589	x = ((x >> 4) + x) & 0x0f0f0f0f;
438	x *= 0x01010101;	590	x *= 0x01010101;
439		591
440	return x >> 24;	592	return x >> 24;
441	}	593	}
442		594
443	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;	595	ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
444	ecb_function_ int ecb_ld32 (uint32_t x)	596	ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
445	{	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
446	int r = 0;	603	int r = 0;
447		604
448	if (x >> 16) { x >>= 16; r += 16; }	605	if (x >> 16) { x >>= 16; r += 16; }
449	if (x >> 8) { x >>= 8; r += 8; }	606	if (x >> 8) { x >>= 8; r += 8; }
450	if (x >> 4) { x >>= 4; r += 4; }	607	if (x >> 4) { x >>= 4; r += 4; }
451	if (x >> 2) { x >>= 2; r += 2; }	608	if (x >> 2) { x >>= 2; r += 2; }
452	if (x >> 1) { r += 1; }	609	if (x >> 1) { r += 1; }
453		610
454	return r;	611	return r;
		612	#endif
455	}	613	}
456		614
457	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;	615	ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
458	ecb_function_ int ecb_ld64 (uint64_t x)	616	ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
459	{	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
460	int r = 0;	623	int r = 0;
461		624
462	if (x >> 32) { x >>= 32; r += 32; }	625	if (x >> 32) { x >>= 32; r += 32; }
463		626
464	return r + ecb_ld32 (x);	627	return r + ecb_ld32 (x);
465	}
466	#endif	628	#endif
		629	}
		630	#endif
467		631
468	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;	632	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
469	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }	633	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
470	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;	634	ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
471	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }	635	ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
472		636
473	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;	637	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
474	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)	638	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
475	{	639	{
476	return ( (x * 0x0802U & 0x22110U)	640	return ( (x * 0x0802U & 0x22110U)
477	| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;	641	| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
478	}	642	}
479		643
480	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;	644	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
481	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)	645	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
482	{	646	{
483	x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);	647	x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
484	x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);	648	x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
485	x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);	649	x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
486	x = ( x >> 8 ) | ( x << 8);	650	x = ( x >> 8 ) | ( x << 8);
487		651
488	return x;	652	return x;
489	}	653	}
490		654
491	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;	655	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
492	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)	656	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
493	{	657	{
494	x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);	658	x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
495	x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);	659	x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
496	x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);	660	x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
497	x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);	661	x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
498	x = ( x >> 16 ) | ( x << 16);	662	x = ( x >> 16 ) | ( x << 16);
499		663
500	return x;	664	return x;
501	}	665	}
502		666
503	/* popcount64 is only available on 64 bit cpus as gcc builtin */
504	/* so for this version we are lazy */
505	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;	667	ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
506	ecb_function_ int	668	ecb_function_ ecb_const int
507	ecb_popcount64 (uint64_t x)	669	ecb_popcount64 (uint64_t x)
508	{	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
509	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);	676	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
		677	#endif
510	}	678	}
511		679
512	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);
513	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);
514	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);
515	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);
516	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);
517	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);
518	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);
519	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);
520		688
521	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)); }
522	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)); }
523	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)); }
524	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)); }
525	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)); }
526	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)); }
527	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)); }
528	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)); }
		697
		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
529		735
530	#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))	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
531	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)	740	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
		741	#endif
532	#define ecb_bswap32(x) __builtin_bswap32 (x)	742	#define ecb_bswap32(x) __builtin_bswap32 (x)
533	#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)))
534	#else	749	#else
535	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;	750	ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
536	ecb_function_ uint16_t	751	ecb_function_ ecb_const uint16_t
537	ecb_bswap16 (uint16_t x)	752	ecb_bswap16 (uint16_t x)
538	{	753	{
539	return ecb_rotl16 (x, 8);	754	return ecb_rotl16 (x, 8);
540	}	755	}
541		756
542	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;	757	ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
543	ecb_function_ uint32_t	758	ecb_function_ ecb_const uint32_t
544	ecb_bswap32 (uint32_t x)	759	ecb_bswap32 (uint32_t x)
545	{	760	{
546	return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);	761	return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
547	}	762	}
548		763
549	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;	764	ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
550	ecb_function_ uint64_t	765	ecb_function_ ecb_const uint64_t
551	ecb_bswap64 (uint64_t x)	766	ecb_bswap64 (uint64_t x)
552	{	767	{
553	return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);	768	return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
554	}	769	}
555	#endif	770	#endif
556		771
557	#if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)	772	#if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
558	#define ecb_unreachable() __builtin_unreachable ()	773	#define ecb_unreachable() __builtin_unreachable ()
559	#else	774	#else
560	/* 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 :/ */
561	ecb_inline void ecb_unreachable (void) ecb_noreturn;	776	ecb_inline ecb_noreturn void ecb_unreachable (void);
562	ecb_inline void ecb_unreachable (void) { }	777	ecb_inline ecb_noreturn void ecb_unreachable (void) { }
563	#endif	778	#endif
564		779
565	/* try to tell the compiler that some condition is definitely true */	780	/* try to tell the compiler that some condition is definitely true */
566	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0	781	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
567		782
568	ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;	783	ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
569	ecb_inline unsigned char	784	ecb_inline ecb_const uint32_t
570	ecb_byteorder_helper (void)	785	ecb_byteorder_helper (void)
571	{	786	{
572	/* the union code still generates code under pressure in gcc, */	787	/* the union code still generates code under pressure in gcc, */
573	/* but less than using pointers, and always seems to */	788	/* but less than using pointers, and always seems to */
574	/* successfully return a constant. */	789	/* successfully return a constant. */
575	/* the reason why we have this horrible preprocessor mess */	790	/* the reason why we have this horrible preprocessor mess */
576	/* is to avoid it in all cases, at least on common architectures */	791	/* is to avoid it in all cases, at least on common architectures */
577	/* or when using a recent enough gcc version (>= 4.6) */	792	/* or when using a recent enough gcc version (>= 4.6) */
578	#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
579	return 0x44;
580	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__	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
581	return 0x44;	796	return 0x44332211;
582	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__	797	#elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
		798	|| ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
		799	#define ECB_BIG_ENDIAN 1
583	return 0x11;	800	return 0x11223344;
584	#else	801	#else
585	union	802	union
586	{	803	{
		804	uint8_t c[4];
587	uint32_t i;	805	uint32_t u;
588	uint8_t c;
589	} u = { 0x11223344 };	806	} u = { 0x11, 0x22, 0x33, 0x44 };
590	return u.c;	807	return u.u;
591	#endif	808	#endif
592	}	809	}
593		810
594	ecb_inline ecb_bool ecb_big_endian (void) ecb_const;	811	ecb_inline ecb_const ecb_bool ecb_big_endian (void);
595	ecb_inline 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; }
596	ecb_inline ecb_bool ecb_little_endian (void) ecb_const;	813	ecb_inline ecb_const ecb_bool ecb_little_endian (void);
597	ecb_inline 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 */
598		1177
599	#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 */
600	#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))
601	#else	1181	#else
602	#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)))
603	#endif	1183	#endif
604		1184
605	#if __cplusplus	1185	#if ECB_CPP
606	template<typename T>	1186	template<typename T>
607	static inline T ecb_div_rd (T val, T div)	1187	static inline T ecb_div_rd (T val, T div)
608	{	1188	{
609	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;	1189	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
610	}	1190	}
…		…
615	}	1195	}
616	#else	1196	#else
617	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))	1197	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
618	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))	1198	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
619	#endif	1199	#endif
		1200
		1201	/*****************************************************************************/
		1202	/* array length */
620		1203
621	#if ecb_cplusplus_does_not_suck	1204	#if ecb_cplusplus_does_not_suck
622	/* 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) */
623	template<typename T, int N>	1206	template<typename T, int N>
624	static inline int ecb_array_length (const T (&arr)[N])	1207	static inline int ecb_array_length (const T (&arr)[N])
…		…
627	}	1210	}
628	#else	1211	#else
629	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	1212	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
630	#endif	1213	#endif
631		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	}
		1439	#endif
		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
632	/*******************************************************************************/	1536	/*******************************************************************************/
633	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */	1537	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
634		1538
635	/* basically, everything uses "ieee pure-endian" floating point numbers */	1539	/* basically, everything uses "ieee pure-endian" floating point numbers */
636	/* the only noteworthy exception is ancient armle, which uses order 43218765 */	1540	/* the only noteworthy exception is ancient armle, which uses order 43218765 */
637	#if 0 \	1541	#if 0 \
638	|| __i386 || __i386__ \	1542	|| __i386 || __i386__ \
639	|| __amd64 || __amd64__ || __x86_64 || __x86_64__ \	1543	|| ECB_GCC_AMD64 \
640	|| __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \	1544	|| __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
641	|| defined __s390__ || defined __s390x__ \	1545	|| defined __s390__ || defined __s390x__ \
642	|| defined __mips__ \	1546	|| defined __mips__ \
643	|| defined __alpha__ \	1547	|| defined __alpha__ \
644	|| defined __hppa__ \	1548	|| defined __hppa__ \
645	|| defined __ia64__ \	1549	|| defined __ia64__ \
646	|| defined __m68k__ \	1550	|| defined __m68k__ \
647	|| defined __m88k__ \	1551	|| defined __m88k__ \
648	|| defined __sh__ \	1552	|| defined __sh__ \
649	|| defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \	1553	|| defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
650	|| (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \	1554	|| (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
651	|| defined __aarch64__	1555	|| defined __aarch64__
652	#define ECB_STDFP 1	1556	#define ECB_STDFP 1
653	#include <string.h> /* for memcpy */
654	#else	1557	#else
655	#define ECB_STDFP 0	1558	#define ECB_STDFP 0
656	#endif	1559	#endif
657		1560
658	#ifndef ECB_NO_LIBM	1561	#ifndef ECB_NO_LIBM
…		…
670	#define ECB_NAN NAN	1573	#define ECB_NAN NAN
671	#else	1574	#else
672	#define ECB_NAN ECB_INFINITY	1575	#define ECB_NAN ECB_INFINITY
673	#endif	1576	#endif
674		1577
675	/* converts an ieee half/binary16 to a float */	1578	#if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
676	ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;	1579	#define ecb_ldexpf(x,e) ldexpf ((x), (e))
677	ecb_function_ float	1580	#define ecb_frexpf(x,e) frexpf ((x), (e))
678	ecb_binary16_to_float (uint16_t x)	1581	#else
679	{	1582	#define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
680	int e = (x >> 10) & 0x1f;	1583	#define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
681	int m = x & 0x3ff;	1584	#endif
682	float r;
683
684	if (!e ) r = ldexpf (m , -24);
685	else if (e != 31) r = ldexpf (m + 0x400, e - 25);
686	else if (m ) r = ECB_NAN;
687	else r = ECB_INFINITY;
688
689	return x & 0x8000 ? -r : r;
690	}
691		1585
692	/* convert a float to ieee single/binary32 */	1586	/* convert a float to ieee single/binary32 */
693	ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;	1587	ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
694	ecb_function_ uint32_t	1588	ecb_function_ ecb_const uint32_t
695	ecb_float_to_binary32 (float x)	1589	ecb_float_to_binary32 (float x)
696	{	1590	{
697	uint32_t r;	1591	uint32_t r;
698		1592
699	#if ECB_STDFP	1593	#if ECB_STDFP
…		…
706	if (x == 0e0f ) return 0x00000000U;	1600	if (x == 0e0f ) return 0x00000000U;
707	if (x > +3.40282346638528860e+38f) return 0x7f800000U;	1601	if (x > +3.40282346638528860e+38f) return 0x7f800000U;
708	if (x < -3.40282346638528860e+38f) return 0xff800000U;	1602	if (x < -3.40282346638528860e+38f) return 0xff800000U;
709	if (x != x ) return 0x7fbfffffU;	1603	if (x != x ) return 0x7fbfffffU;
710		1604
711	m = frexpf (x, &e) * 0x1000000U;	1605	m = ecb_frexpf (x, &e) * 0x1000000U;
712		1606
713	r = m & 0x80000000U;	1607	r = m & 0x80000000U;
714		1608
715	if (r)	1609	if (r)
716	m = -m;	1610	m = -m;
…		…
728		1622
729	return r;	1623	return r;
730	}	1624	}
731		1625
732	/* converts an ieee single/binary32 to a float */	1626	/* converts an ieee single/binary32 to a float */
733	ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;	1627	ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
734	ecb_function_ float	1628	ecb_function_ ecb_const float
735	ecb_binary32_to_float (uint32_t x)	1629	ecb_binary32_to_float (uint32_t x)
736	{	1630	{
737	float r;	1631	float r;
738		1632
739	#if ECB_STDFP	1633	#if ECB_STDFP
…		…
749	x |= 0x800000U;	1643	x |= 0x800000U;
750	else	1644	else
751	e = 1;	1645	e = 1;
752		1646
753	/* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */	1647	/* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
754	r = ldexpf (x * (0.5f / 0x800000U), e - 126);	1648	r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
755		1649
756	r = neg ? -r : r;	1650	r = neg ? -r : r;
757	#endif	1651	#endif
758		1652
759	return r;	1653	return r;
760	}	1654	}
761		1655
762	/* convert a double to ieee double/binary64 */	1656	/* convert a double to ieee double/binary64 */
763	ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;	1657	ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
764	ecb_function_ uint64_t	1658	ecb_function_ ecb_const uint64_t
765	ecb_double_to_binary64 (double x)	1659	ecb_double_to_binary64 (double x)
766	{	1660	{
767	uint64_t r;	1661	uint64_t r;
768		1662
769	#if ECB_STDFP	1663	#if ECB_STDFP
…		…
798		1692
799	return r;	1693	return r;
800	}	1694	}
801		1695
802	/* converts an ieee double/binary64 to a double */	1696	/* converts an ieee double/binary64 to a double */
803	ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;	1697	ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
804	ecb_function_ double	1698	ecb_function_ ecb_const double
805	ecb_binary64_to_double (uint64_t x)	1699	ecb_binary64_to_double (uint64_t x)
806	{	1700	{
807	double r;	1701	double r;
808		1702
809	#if ECB_STDFP	1703	#if ECB_STDFP
…		…
827	#endif	1721	#endif
828		1722
829	return r;	1723	return r;
830	}	1724	}
831		1725
832	#endif	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	}
833		1733
834	#endif	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	}
835		1741
		1742	#endif
		1743
		1744	#endif
		1745

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