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Comparing libecb/ecb.h (file contents):
Revision 1.165 by sf-exg, Fri May 1 12:02:18 2015 UTC vs.
Revision 1.214 by root, Fri Mar 25 15:36:36 2022 UTC

1	/*	1	/*
2	* libecb - http://software.schmorp.de/pkg/libecb	2	* libecb - http://software.schmorp.de/pkg/libecb
3	*	3	*
4	* Copyright (©) 2009-2015 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
79	#define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)	89	#define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
80	#define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)	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
81		99
82	/* work around x32 idiocy by defining proper macros */	100	/* work around x32 idiocy by defining proper macros */
83	#if ECB_GCC_AMD64 || ECB_MSVC_AMD64	101	#if ECB_GCC_AMD64 || ECB_MSVC_AMD64
84	#if _ILP32	102	#if _ILP32
85	#define ECB_AMD64_X32 1	103	#define ECB_AMD64_X32 1
86	#else	104	#else
87	#define ECB_AMD64 1	105	#define ECB_AMD64 1
88	#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
89	#endif	113	#endif
90		114
91	/* many compilers define _GNUC_ to some versions but then only implement	115	/* many compilers define _GNUC_ to some versions but then only implement
92	* what their idiot authors think are the "more important" extensions,	116	* what their idiot authors think are the "more important" extensions,
93	* causing enormous grief in return for some better fake benchmark numbers.	117	* causing enormous grief in return for some better fake benchmark numbers.
…		…
115	#define ECB_CLANG_EXTENSION(x) 0	139	#define ECB_CLANG_EXTENSION(x) 0
116	#endif	140	#endif
117		141
118	#define ECB_CPP (__cplusplus+0)	142	#define ECB_CPP (__cplusplus+0)
119	#define ECB_CPP11 (__cplusplus >= 201103L)	143	#define ECB_CPP11 (__cplusplus >= 201103L)
		144	#define ECB_CPP14 (__cplusplus >= 201402L)
		145	#define ECB_CPP17 (__cplusplus >= 201703L)
120		146
121	#if ECB_CPP	147	#if ECB_CPP
122	#define ECB_C 0	148	#define ECB_C 0
123	#define ECB_STDC_VERSION 0	149	#define ECB_STDC_VERSION 0
124	#else	150	#else
…		…
126	#define ECB_STDC_VERSION __STDC_VERSION__	152	#define ECB_STDC_VERSION __STDC_VERSION__
127	#endif	153	#endif
128		154
129	#define ECB_C99 (ECB_STDC_VERSION >= 199901L)	155	#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
130	#define ECB_C11 (ECB_STDC_VERSION >= 201112L)	156	#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
		157	#define ECB_C17 (ECB_STDC_VERSION >= 201710L)
131		158
132	#if ECB_CPP	159	#if ECB_CPP
133	#define ECB_EXTERN_C extern "C"	160	#define ECB_EXTERN_C extern "C"
134	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {	161	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {
135	#define ECB_EXTERN_C_END }	162	#define ECB_EXTERN_C_END }
…		…
155	/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */	182	/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
156	#if __xlC__ && ECB_CPP	183	#if __xlC__ && ECB_CPP
157	#include <builtins.h>	184	#include <builtins.h>
158	#endif	185	#endif
159		186
		187	#if 1400 <= _MSC_VER
		188	#include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
		189	#endif
		190
160	#ifndef ECB_MEMORY_FENCE	191	#ifndef ECB_MEMORY_FENCE
161	#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")
162	#if __i386 || __i386__	194	#if __i386 || __i386__
163	#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")
164	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")	196	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
165	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")	197	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
166	#elif ECB_GCC_AMD64	198	#elif ECB_GCC_AMD64
167	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")	199	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
168	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")	200	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
169	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")	201	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
170	#elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__	202	#elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
171	#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 */
172	#elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \	211	#elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
173	|| defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__	212	|| defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
		213	|| defined __ARM_ARCH_6T2__
174	#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")
175	#elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \	215	#elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
176	|| defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__	216	|| defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
177	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")	217	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
178	#elif __aarch64__	218	#elif __aarch64__
179	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")	219	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
180	#elif (__sparc || __sparc__) && !__sparcv8	220	#elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
181	#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")
182	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")	222	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
183	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")	223	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
184	#elif defined __s390__ || defined __s390x__	224	#elif defined __s390__ || defined __s390x__
185	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")	225	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
…		…
208	#if ECB_GCC_VERSION(4,7)	248	#if ECB_GCC_VERSION(4,7)
209	/* see comment below (stdatomic.h) about the C11 memory model. */	249	/* see comment below (stdatomic.h) about the C11 memory model. */
210	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)	250	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
211	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)	251	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
212	#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)
213		255
214	#elif ECB_CLANG_EXTENSION(c_atomic)	256	#elif ECB_CLANG_EXTENSION(c_atomic)
215	/* see comment below (stdatomic.h) about the C11 memory model. */	257	/* see comment below (stdatomic.h) about the C11 memory model. */
216	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)	258	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
217	#define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)	259	#define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
218	#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)
219		263
220	#elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__	264	#elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
221	#define ECB_MEMORY_FENCE __sync_synchronize ()	265	#define ECB_MEMORY_FENCE __sync_synchronize ()
222	#elif _MSC_VER >= 1500 /* VC++ 2008 */	266	#elif _MSC_VER >= 1500 /* VC++ 2008 */
223	/* 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... */
…		…
233	#elif defined _WIN32	277	#elif defined _WIN32
234	#include <WinNT.h>	278	#include <WinNT.h>
235	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */	279	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
236	#elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110	280	#elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
237	#include <mbarrier.h>	281	#include <mbarrier.h>
238	#define ECB_MEMORY_FENCE __machine_rw_barrier ()	282	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
239	#define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()	283	#define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier ()
240	#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 ()
241	#elif __xlC__	286	#elif __xlC__
242	#define ECB_MEMORY_FENCE __sync ()	287	#define ECB_MEMORY_FENCE __sync ()
243	#endif	288	#endif
244	#endif	289	#endif
245		290
246	#ifndef ECB_MEMORY_FENCE	291	#ifndef ECB_MEMORY_FENCE
247	#if ECB_C11 && !defined __STDC_NO_ATOMICS__	292	#if ECB_C11 && !defined __STDC_NO_ATOMICS__
248	/* 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, */
249	/* not just C11 atomics and atomic accesses */	294	/* not just C11 atomics and atomic accesses */
250	#include <stdatomic.h>	295	#include <stdatomic.h>
251	/* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
252	/* any fence other than seq_cst, which isn't very efficient for us. */
253	/* Why that is, we don't know - either the C11 memory model is quite useless */
254	/* for most usages, or gcc and clang have a bug */
255	/* I *currently* lean towards the latter, and inefficiently implement */
256	/* all three of ecb's fences as a seq_cst fence */
257	/* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
258	/* for all __atomic_thread_fence's except seq_cst */
259	#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)
260	#endif	299	#endif
261	#endif	300	#endif
262		301
263	#ifndef ECB_MEMORY_FENCE	302	#ifndef ECB_MEMORY_FENCE
264	#if !ECB_AVOID_PTHREADS	303	#if !ECB_AVOID_PTHREADS
…		…
284		323
285	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE	324	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
286	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE	325	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
287	#endif	326	#endif
288		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
289	/*****************************************************************************/	332	/*****************************************************************************/
290		333
291	#if ECB_CPP	334	#if ECB_CPP
292	#define ecb_inline static inline	335	#define ecb_inline static inline
293	#elif ECB_GCC_VERSION(2,5)	336	#elif ECB_GCC_VERSION(2,5)
…		…
312	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	355	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
313	#define ECB_STRINGIFY_(a) # a	356	#define ECB_STRINGIFY_(a) # a
314	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)	357	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
315	#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))	358	#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
316		359
		360	/* This marks larger functions that do not neccessarily need to be inlined */
		361	/* The idea is to possibly compile the header twice, */
		362	/* once exposing only the declarations, another time to define external functions */
		363	/* TODO: possibly static would be best for these at the moment? */
317	#define ecb_function_ ecb_inline	364	#define ecb_function_ ecb_inline
318		365
319	#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)	366	#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
320	#define ecb_attribute(attrlist) __attribute__ (attrlist)	367	#define ecb_attribute(attrlist) __attribute__ (attrlist)
321	#else	368	#else
…		…
411	/* count trailing zero bits and count # of one bits */	458	/* count trailing zero bits and count # of one bits */
412	#if ECB_GCC_VERSION(3,4) \	459	#if ECB_GCC_VERSION(3,4) \
413	|| (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \	460	|| (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
414	&& ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \	461	&& ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
415	&& ECB_CLANG_BUILTIN(__builtin_popcount))	462	&& ECB_CLANG_BUILTIN(__builtin_popcount))
416	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
417	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
418	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
419	#define ecb_ctz32(x) __builtin_ctz (x)	463	#define ecb_ctz32(x) __builtin_ctz (x)
		464	#define ecb_ctz64(x) (__SIZEOF_LONG__ == 64 ? __builtin_ctzl (x) : __builtin_ctzll (x))
420	#define ecb_ctz64(x) __builtin_ctzll (x)	465	#define ecb_clz32(x) __builtin_clz (x)
		466	#define ecb_clz64(x) (__SIZEOF_LONG__ == 64 ? __builtin_clzl (x) : __builtin_clzll (x))
		467	#define ecb_ld32(x) (ecb_clz32 (x) ^ 31)
		468	#define ecb_ld64(x) (ecb_clz64 (x) ^ 63)
421	#define ecb_popcount32(x) __builtin_popcount (x)	469	#define ecb_popcount32(x) __builtin_popcount (x)
422	/* no popcountll */	470	/* ecb_popcount64 is more difficult, see below */
423	#else	471	#else
424	ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);	472	ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
425	ecb_function_ ecb_const int	473	ecb_function_ ecb_const int ecb_ctz32 (uint32_t x)
426	ecb_ctz32 (uint32_t x)
427	{	474	{
		475	#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
		476	unsigned long r;
		477	_BitScanForward (&r, x);
		478	return (int)r;
		479	#else
428	int r = 0;	480	int r;
429		481
430	x &= ~x + 1; /* this isolates the lowest bit */	482	x &= ~x + 1; /* this isolates the lowest bit */
431		483
432	#if ECB_branchless_on_i386	484	#if 1
		485	/* David Seal's algorithm, Message-ID: <32975@armltd.uucp> from 1994 */
		486	/* This happens to return 32 for x == 0, but the API does not support this */
		487
		488	/* -0 marks unused entries */
		489	static unsigned char table[64] =
		490	{
		491	32, 0, 1, 12, 2, 6, -0, 13, 3, -0, 7, -0, -0, -0, -0, 14,
		492	10, 4, -0, -0, 8, -0, -0, 25, -0, -0, -0, -0, -0, 21, 27, 15,
		493	31, 11, 5, -0, -0, -0, -0, -0, 9, -0, -0, 24, -0, -0, 20, 26,
		494	30, -0, -0, -0, -0, 23, -0, 19, 29, -0, 22, 18, 28, 17, 16, -0
		495	};
		496
		497	/* magic constant results in 33 unique values in the upper 6 bits */
		498	x *= 0x0450fbafU; /* == 17 * 65 * 65535 */
		499
		500	r = table [x >> 26];
		501	#elif 0 /* branchless on i386, typically */
		502	r = 0;
433	r += !!(x & 0xaaaaaaaa) << 0;	503	r += !!(x & 0xaaaaaaaa) << 0;
434	r += !!(x & 0xcccccccc) << 1;	504	r += !!(x & 0xcccccccc) << 1;
435	r += !!(x & 0xf0f0f0f0) << 2;	505	r += !!(x & 0xf0f0f0f0) << 2;
436	r += !!(x & 0xff00ff00) << 3;	506	r += !!(x & 0xff00ff00) << 3;
437	r += !!(x & 0xffff0000) << 4;	507	r += !!(x & 0xffff0000) << 4;
438	#else	508	#else /* branchless on modern compilers, typically */
		509	r = 0;
439	if (x & 0xaaaaaaaa) r += 1;	510	if (x & 0xaaaaaaaa) r += 1;
440	if (x & 0xcccccccc) r += 2;	511	if (x & 0xcccccccc) r += 2;
441	if (x & 0xf0f0f0f0) r += 4;	512	if (x & 0xf0f0f0f0) r += 4;
442	if (x & 0xff00ff00) r += 8;	513	if (x & 0xff00ff00) r += 8;
443	if (x & 0xffff0000) r += 16;	514	if (x & 0xffff0000) r += 16;
444	#endif	515	#endif
445		516
446	return r;	517	return r;
		518	#endif
447	}	519	}
448		520
449	ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);	521	ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
450	ecb_function_ ecb_const int	522	ecb_function_ ecb_const int ecb_ctz64 (uint64_t x)
451	ecb_ctz64 (uint64_t x)
452	{	523	{
		524	#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
		525	unsigned long r;
		526	_BitScanForward64 (&r, x);
		527	return (int)r;
		528	#else
453	int shift = x & 0xffffffffU ? 0 : 32;	529	int shift = x & 0xffffffff ? 0 : 32;
454	return ecb_ctz32 (x >> shift) + shift;	530	return ecb_ctz32 (x >> shift) + shift;
		531	#endif
		532	}
		533
		534	ecb_function_ ecb_const int ecb_clz32 (uint32_t x);
		535	ecb_function_ ecb_const int ecb_clz32 (uint32_t x)
		536	{
		537	#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
		538	unsigned long r;
		539	_BitScanReverse (&r, x);
		540	return (int)r;
		541	#else
		542
		543	/* Robert Harley's algorithm from comp.arch 1996-12-07 */
		544	/* This happens to return 32 for x == 0, but the API does not support this */
		545
		546	/* -0 marks unused table elements */
		547	static unsigned char table[64] =
		548	{
		549	32, 31, -0, 16, -0, 30, 3, -0, 15, -0, -0, -0, 29, 10, 2, -0,
		550	-0, -0, 12, 14, 21, -0, 19, -0, -0, 28, -0, 25, -0, 9, 1, -0,
		551	17, -0, 4, -0, -0, -0, 11, -0, 13, 22, 20, -0, 26, -0, -0, 18,
		552	5, -0, -0, 23, -0, 27, -0, 6, -0, 24, 7, -0, 8, -0, 0, -0
		553	};
		554
		555	/* propagate leftmost 1 bit to the right */
		556	x |= x >> 1;
		557	x |= x >> 2;
		558	x |= x >> 4;
		559	x |= x >> 8;
		560	x |= x >> 16;
		561
		562	/* magic constant results in 33 unique values in the upper 6 bits */
		563	x *= 0x06EB14F9U; /* == 7 * 255 * 255 * 255 */
		564
		565	return table [x >> 26];
		566	#endif
		567	}
		568
		569	ecb_function_ ecb_const int ecb_clz64 (uint64_t x);
		570	ecb_function_ ecb_const int 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
455	}	581	}
456		582
457	ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);	583	ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
458	ecb_function_ ecb_const int	584	ecb_function_ ecb_const int
459	ecb_popcount32 (uint32_t x)	585	ecb_popcount32 (uint32_t x)
…		…
467	}	593	}
468		594
469	ecb_function_ ecb_const int ecb_ld32 (uint32_t x);	595	ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
470	ecb_function_ ecb_const int ecb_ld32 (uint32_t x)	596	ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
471	{	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
472	int r = 0;	603	int r = 0;
473		604
474	if (x >> 16) { x >>= 16; r += 16; }	605	if (x >> 16) { x >>= 16; r += 16; }
475	if (x >> 8) { x >>= 8; r += 8; }	606	if (x >> 8) { x >>= 8; r += 8; }
476	if (x >> 4) { x >>= 4; r += 4; }	607	if (x >> 4) { x >>= 4; r += 4; }
477	if (x >> 2) { x >>= 2; r += 2; }	608	if (x >> 2) { x >>= 2; r += 2; }
478	if (x >> 1) { r += 1; }	609	if (x >> 1) { r += 1; }
479		610
480	return r;	611	return r;
		612	#endif
481	}	613	}
482		614
483	ecb_function_ ecb_const int ecb_ld64 (uint64_t x);	615	ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
484	ecb_function_ ecb_const int ecb_ld64 (uint64_t x)	616	ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
485	{	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
486	int r = 0;	623	int r = 0;
487		624
488	if (x >> 32) { x >>= 32; r += 32; }	625	if (x >> 32) { x >>= 32; r += 32; }
489		626
490	return r + ecb_ld32 (x);	627	return r + ecb_ld32 (x);
		628	#endif
491	}	629	}
492	#endif	630	#endif
493		631
494	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);	632	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
495	ecb_function_ ecb_const 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)); }
…		…
524	x = ( x >> 16 ) | ( x << 16);	662	x = ( x >> 16 ) | ( x << 16);
525		663
526	return x;	664	return x;
527	}	665	}
528		666
529	/* popcount64 is only available on 64 bit cpus as gcc builtin */
530	/* so for this version we are lazy */
531	ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);	667	ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
532	ecb_function_ ecb_const int	668	ecb_function_ ecb_const int ecb_popcount64 (uint64_t x)
533	ecb_popcount64 (uint64_t x)
534	{	669	{
		670	/* popcount64 is only available on 64 bit cpus as gcc builtin. */
		671	/* also, gcc/clang make this surprisingly difficult to use */
		672	#if (__SIZEOF_LONG__ == 8) && (ECB_GCC_VERSION(3,4) || ECB_CLANG_BUILTIN (__builtin_popcountl))
		673	return __builtin_popcountl (x);
		674	#else
535	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);	675	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
		676	#endif
536	}	677	}
537		678
538	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);	679	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
539	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);	680	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
540	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);	681	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
…		…
542	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);	683	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
543	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);	684	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
544	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);	685	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
545	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);	686	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
546		687
547	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }	688	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> (-count & 7)) | (x << (count & 7)); }
548	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }	689	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << (-count & 7)) | (x >> (count & 7)); }
549	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }	690	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (-count & 15)) | (x << (count & 15)); }
550	ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }	691	ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (-count & 15)) | (x >> (count & 15)); }
551	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }	692	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (-count & 31)) | (x << (count & 31)); }
552	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }	693	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (-count & 31)) | (x >> (count & 31)); }
553	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }	694	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (-count & 63)) | (x << (count & 63)); }
554	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }	695	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (-count & 63)) | (x >> (count & 63)); }
		696
		697	#if ECB_CPP
		698
		699	inline uint8_t ecb_ctz (uint8_t v) { return ecb_ctz32 (v); }
		700	inline uint16_t ecb_ctz (uint16_t v) { return ecb_ctz32 (v); }
		701	inline uint32_t ecb_ctz (uint32_t v) { return ecb_ctz32 (v); }
		702	inline uint64_t ecb_ctz (uint64_t v) { return ecb_ctz64 (v); }
		703
		704	inline bool ecb_is_pot (uint8_t v) { return ecb_is_pot32 (v); }
		705	inline bool ecb_is_pot (uint16_t v) { return ecb_is_pot32 (v); }
		706	inline bool ecb_is_pot (uint32_t v) { return ecb_is_pot32 (v); }
		707	inline bool ecb_is_pot (uint64_t v) { return ecb_is_pot64 (v); }
		708
		709	inline int ecb_ld (uint8_t v) { return ecb_ld32 (v); }
		710	inline int ecb_ld (uint16_t v) { return ecb_ld32 (v); }
		711	inline int ecb_ld (uint32_t v) { return ecb_ld32 (v); }
		712	inline int ecb_ld (uint64_t v) { return ecb_ld64 (v); }
		713
		714	inline int ecb_popcount (uint8_t v) { return ecb_popcount32 (v); }
		715	inline int ecb_popcount (uint16_t v) { return ecb_popcount32 (v); }
		716	inline int ecb_popcount (uint32_t v) { return ecb_popcount32 (v); }
		717	inline int ecb_popcount (uint64_t v) { return ecb_popcount64 (v); }
		718
		719	inline uint8_t ecb_bitrev (uint8_t v) { return ecb_bitrev8 (v); }
		720	inline uint16_t ecb_bitrev (uint16_t v) { return ecb_bitrev16 (v); }
		721	inline uint32_t ecb_bitrev (uint32_t v) { return ecb_bitrev32 (v); }
		722
		723	inline uint8_t ecb_rotl (uint8_t v, unsigned int count) { return ecb_rotl8 (v, count); }
		724	inline uint16_t ecb_rotl (uint16_t v, unsigned int count) { return ecb_rotl16 (v, count); }
		725	inline uint32_t ecb_rotl (uint32_t v, unsigned int count) { return ecb_rotl32 (v, count); }
		726	inline uint64_t ecb_rotl (uint64_t v, unsigned int count) { return ecb_rotl64 (v, count); }
		727
		728	inline uint8_t ecb_rotr (uint8_t v, unsigned int count) { return ecb_rotr8 (v, count); }
		729	inline uint16_t ecb_rotr (uint16_t v, unsigned int count) { return ecb_rotr16 (v, count); }
		730	inline uint32_t ecb_rotr (uint32_t v, unsigned int count) { return ecb_rotr32 (v, count); }
		731	inline uint64_t ecb_rotr (uint64_t v, unsigned int count) { return ecb_rotr64 (v, count); }
		732
		733	#endif
555		734
556	#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))	735	#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
557	#if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)	736	#if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
558	#define ecb_bswap16(x) __builtin_bswap16 (x)	737	#define ecb_bswap16(x) __builtin_bswap16 (x)
559	#else	738	#else
…		…
566	#define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))	745	#define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
567	#define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))	746	#define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
568	#define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))	747	#define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
569	#else	748	#else
570	ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);	749	ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
571	ecb_function_ ecb_const uint16_t	750	ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x)
572	ecb_bswap16 (uint16_t x)
573	{	751	{
574	return ecb_rotl16 (x, 8);	752	return ecb_rotl16 (x, 8);
575	}	753	}
576		754
577	ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);	755	ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
578	ecb_function_ ecb_const uint32_t	756	ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x)
579	ecb_bswap32 (uint32_t x)
580	{	757	{
581	return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);	758	return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
582	}	759	}
583		760
584	ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);	761	ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
585	ecb_function_ ecb_const uint64_t	762	ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x)
586	ecb_bswap64 (uint64_t x)
587	{	763	{
588	return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);	764	return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
589	}	765	}
590	#endif	766	#endif
591		767
…		…
598	#endif	774	#endif
599		775
600	/* try to tell the compiler that some condition is definitely true */	776	/* try to tell the compiler that some condition is definitely true */
601	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0	777	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
602		778
603	ecb_inline ecb_const unsigned char ecb_byteorder_helper (void);	779	ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
604	ecb_inline ecb_const unsigned char	780	ecb_inline ecb_const uint32_t ecb_byteorder_helper (void)
605	ecb_byteorder_helper (void)
606	{	781	{
607	/* the union code still generates code under pressure in gcc, */	782	/* the union code still generates code under pressure in gcc, */
608	/* but less than using pointers, and always seems to */	783	/* but less than using pointers, and always seems to */
609	/* successfully return a constant. */	784	/* successfully return a constant. */
610	/* the reason why we have this horrible preprocessor mess */	785	/* the reason why we have this horrible preprocessor mess */
611	/* is to avoid it in all cases, at least on common architectures */	786	/* is to avoid it in all cases, at least on common architectures */
612	/* or when using a recent enough gcc version (>= 4.6) */	787	/* or when using a recent enough gcc version (>= 4.6) */
613	#if ((__i386 || __i386__) && !__VOS__) || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64
614	return 0x44;
615	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__	788	#if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
		789	|| ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
		790	#define ECB_LITTLE_ENDIAN 1
616	return 0x44;	791	return 0x44332211;
617	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__	792	#elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
		793	|| ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
		794	#define ECB_BIG_ENDIAN 1
618	return 0x11;	795	return 0x11223344;
619	#else	796	#else
620	union	797	union
621	{	798	{
		799	uint8_t c[4];
622	uint32_t i;	800	uint32_t u;
623	uint8_t c;
624	} u = { 0x11223344 };	801	} u = { 0x11, 0x22, 0x33, 0x44 };
625	return u.c;	802	return u.u;
626	#endif	803	#endif
627	}	804	}
628		805
629	ecb_inline ecb_const ecb_bool ecb_big_endian (void);	806	ecb_inline ecb_const ecb_bool ecb_big_endian (void);
630	ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }	807	ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
631	ecb_inline ecb_const ecb_bool ecb_little_endian (void);	808	ecb_inline ecb_const ecb_bool ecb_little_endian (void);
632	ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }	809	ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
		810
		811	/*****************************************************************************/
		812	/* unaligned load/store */
		813
		814	ecb_inline uint_fast16_t ecb_be_u16_to_host (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
		815	ecb_inline uint_fast32_t ecb_be_u32_to_host (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
		816	ecb_inline uint_fast64_t ecb_be_u64_to_host (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
		817
		818	ecb_inline uint_fast16_t ecb_le_u16_to_host (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
		819	ecb_inline uint_fast32_t ecb_le_u32_to_host (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
		820	ecb_inline uint_fast64_t ecb_le_u64_to_host (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
		821
		822	ecb_inline uint_fast16_t ecb_peek_u16_u (const void *ptr) { uint16_t v; memcpy (&v, ptr, sizeof (v)); return v; }
		823	ecb_inline uint_fast32_t ecb_peek_u32_u (const void *ptr) { uint32_t v; memcpy (&v, ptr, sizeof (v)); return v; }
		824	ecb_inline uint_fast64_t ecb_peek_u64_u (const void *ptr) { uint64_t v; memcpy (&v, ptr, sizeof (v)); return v; }
		825
		826	ecb_inline uint_fast16_t ecb_peek_be_u16_u (const void *ptr) { return ecb_be_u16_to_host (ecb_peek_u16_u (ptr)); }
		827	ecb_inline uint_fast32_t ecb_peek_be_u32_u (const void *ptr) { return ecb_be_u32_to_host (ecb_peek_u32_u (ptr)); }
		828	ecb_inline uint_fast64_t ecb_peek_be_u64_u (const void *ptr) { return ecb_be_u64_to_host (ecb_peek_u64_u (ptr)); }
		829
		830	ecb_inline uint_fast16_t ecb_peek_le_u16_u (const void *ptr) { return ecb_le_u16_to_host (ecb_peek_u16_u (ptr)); }
		831	ecb_inline uint_fast32_t ecb_peek_le_u32_u (const void *ptr) { return ecb_le_u32_to_host (ecb_peek_u32_u (ptr)); }
		832	ecb_inline uint_fast64_t ecb_peek_le_u64_u (const void *ptr) { return ecb_le_u64_to_host (ecb_peek_u64_u (ptr)); }
		833
		834	ecb_inline uint_fast16_t ecb_host_to_be_u16 (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
		835	ecb_inline uint_fast32_t ecb_host_to_be_u32 (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
		836	ecb_inline uint_fast64_t ecb_host_to_be_u64 (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
		837
		838	ecb_inline uint_fast16_t ecb_host_to_le_u16 (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
		839	ecb_inline uint_fast32_t ecb_host_to_le_u32 (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
		840	ecb_inline uint_fast64_t ecb_host_to_le_u64 (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
		841
		842	ecb_inline void ecb_poke_u16_u (void *ptr, uint16_t v) { memcpy (ptr, &v, sizeof (v)); }
		843	ecb_inline void ecb_poke_u32_u (void *ptr, uint32_t v) { memcpy (ptr, &v, sizeof (v)); }
		844	ecb_inline void ecb_poke_u64_u (void *ptr, uint64_t v) { memcpy (ptr, &v, sizeof (v)); }
		845
		846	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)); }
		847	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)); }
		848	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)); }
		849
		850	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)); }
		851	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)); }
		852	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)); }
		853
		854	#if ECB_CPP
		855
		856	inline uint8_t ecb_bswap (uint8_t v) { return v; }
		857	inline uint16_t ecb_bswap (uint16_t v) { return ecb_bswap16 (v); }
		858	inline uint32_t ecb_bswap (uint32_t v) { return ecb_bswap32 (v); }
		859	inline uint64_t ecb_bswap (uint64_t v) { return ecb_bswap64 (v); }
		860
		861	template<typename T> inline T ecb_be_to_host (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
		862	template<typename T> inline T ecb_le_to_host (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
		863	template<typename T> inline T ecb_peek (const void *ptr) { return *(const T *)ptr; }
		864	template<typename T> inline T ecb_peek_be (const void *ptr) { return ecb_be_to_host (ecb_peek <T> (ptr)); }
		865	template<typename T> inline T ecb_peek_le (const void *ptr) { return ecb_le_to_host (ecb_peek <T> (ptr)); }
		866	template<typename T> inline T ecb_peek_u (const void *ptr) { T v; memcpy (&v, ptr, sizeof (v)); return v; }
		867	template<typename T> inline T ecb_peek_be_u (const void *ptr) { return ecb_be_to_host (ecb_peek_u<T> (ptr)); }
		868	template<typename T> inline T ecb_peek_le_u (const void *ptr) { return ecb_le_to_host (ecb_peek_u<T> (ptr)); }
		869
		870	template<typename T> inline T ecb_host_to_be (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
		871	template<typename T> inline T ecb_host_to_le (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
		872	template<typename T> inline void ecb_poke (void *ptr, T v) { *(T *)ptr = v; }
		873	template<typename T> inline void ecb_poke_be (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_be (v)); }
		874	template<typename T> inline void ecb_poke_le (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_le (v)); }
		875	template<typename T> inline void ecb_poke_u (void *ptr, T v) { memcpy (ptr, &v, sizeof (v)); }
		876	template<typename T> inline void ecb_poke_be_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_be (v)); }
		877	template<typename T> inline void ecb_poke_le_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_le (v)); }
		878
		879	#endif
		880
		881	/*****************************************************************************/
		882	/* pointer/integer hashing */
		883
		884	/* based on hash by Chris Wellons, https://nullprogram.com/blog/2018/07/31/ */
		885	ecb_function_ uint32_t ecb_mix32 (uint32_t v);
		886	ecb_function_ uint32_t ecb_mix32 (uint32_t v)
		887	{
		888	v ^= v >> 16; v *= 0x7feb352dU;
		889	v ^= v >> 15; v *= 0x846ca68bU;
		890	v ^= v >> 16;
		891	return v;
		892	}
		893
		894	ecb_function_ uint32_t ecb_unmix32 (uint32_t v);
		895	ecb_function_ uint32_t ecb_unmix32 (uint32_t v)
		896	{
		897	v ^= v >> 16 ; v *= 0x43021123U;
		898	v ^= v >> 15 ^ v >> 30; v *= 0x1d69e2a5U;
		899	v ^= v >> 16 ;
		900	return v;
		901	}
		902
		903	/* based on splitmix64, by Sebastiona Vigna, https://prng.di.unimi.it/splitmix64.c */
		904	ecb_function_ uint64_t ecb_mix64 (uint64_t v);
		905	ecb_function_ uint64_t ecb_mix64 (uint64_t v)
		906	{
		907	v ^= v >> 30; v *= 0xbf58476d1ce4e5b9U;
		908	v ^= v >> 27; v *= 0x94d049bb133111ebU;
		909	v ^= v >> 31;
		910	return v;
		911	}
		912
		913	ecb_function_ uint64_t ecb_unmix64 (uint64_t v);
		914	ecb_function_ uint64_t ecb_unmix64 (uint64_t v)
		915	{
		916	v ^= v >> 31 ^ v >> 62; v *= 0x319642b2d24d8ec3U;
		917	v ^= v >> 27 ^ v >> 54; v *= 0x96de1b173f119089U;
		918	v ^= v >> 30 ^ v >> 60;
		919	return v;
		920	}
		921
		922	ecb_function_ uintptr_t ecb_ptrmix (void *p);
		923	ecb_function_ uintptr_t ecb_ptrmix (void *p)
		924	{
		925	#if ECB_PTRSIZE <= 4
		926	return ecb_mix32 ((uint32_t)p);
		927	#else
		928	return ecb_mix64 ((uint64_t)p);
		929	#endif
		930	}
		931
		932	ecb_function_ void *ecb_ptrunmix (uintptr_t v);
		933	ecb_function_ void *ecb_ptrunmix (uintptr_t v)
		934	{
		935	#if ECB_PTRSIZE <= 4
		936	return (void *)ecb_unmix32 (v);
		937	#else
		938	return (void *)ecb_unmix64 (v);
		939	#endif
		940	}
		941
		942	#if ECB_CPP
		943
		944	template<typename T>
		945	inline uintptr_t ecb_ptrmix (T *p)
		946	{
		947	return ecb_ptrmix (static_cast<void *>(p));
		948	}
		949
		950	template<typename T>
		951	inline T *ecb_ptrunmix (uintptr_t v)
		952	{
		953	return static_cast<T *>(ecb_ptrunmix (v));
		954	}
		955
		956	#endif
		957
		958	/*****************************************************************************/
		959	/* gray code */
		960
		961	ecb_inline uint_fast8_t ecb_gray_encode8 (uint_fast8_t b) { return b ^ (b >> 1); }
		962	ecb_inline uint_fast16_t ecb_gray_encode16 (uint_fast16_t b) { return b ^ (b >> 1); }
		963	ecb_inline uint_fast32_t ecb_gray_encode32 (uint_fast32_t b) { return b ^ (b >> 1); }
		964	ecb_inline uint_fast64_t ecb_gray_encode64 (uint_fast64_t b) { return b ^ (b >> 1); }
		965
		966	ecb_function_ uint8_t ecb_gray_decode8 (uint8_t g);
		967	ecb_function_ uint8_t ecb_gray_decode8 (uint8_t g)
		968	{
		969	g ^= g >> 1;
		970	g ^= g >> 2;
		971	g ^= g >> 4;
		972
		973	return g;
		974	}
		975
		976	ecb_function_ uint16_t ecb_gray_decode16 (uint16_t g);
		977	ecb_function_ uint16_t ecb_gray_decode16 (uint16_t g)
		978	{
		979	g ^= g >> 1;
		980	g ^= g >> 2;
		981	g ^= g >> 4;
		982	g ^= g >> 8;
		983
		984	return g;
		985	}
		986
		987	ecb_function_ uint32_t ecb_gray_decode32 (uint32_t g);
		988	ecb_function_ uint32_t ecb_gray_decode32 (uint32_t g)
		989	{
		990	g ^= g >> 1;
		991	g ^= g >> 2;
		992	g ^= g >> 4;
		993	g ^= g >> 8;
		994	g ^= g >> 16;
		995
		996	return g;
		997	}
		998
		999	ecb_function_ uint64_t ecb_gray_decode64 (uint64_t g);
		1000	ecb_function_ uint64_t ecb_gray_decode64 (uint64_t g)
		1001	{
		1002	g ^= g >> 1;
		1003	g ^= g >> 2;
		1004	g ^= g >> 4;
		1005	g ^= g >> 8;
		1006	g ^= g >> 16;
		1007	g ^= g >> 32;
		1008
		1009	return g;
		1010	}
		1011
		1012	#if ECB_CPP
		1013
		1014	ecb_inline uint8_t ecb_gray_encode (uint8_t b) { return ecb_gray_encode8 (b); }
		1015	ecb_inline uint16_t ecb_gray_encode (uint16_t b) { return ecb_gray_encode16 (b); }
		1016	ecb_inline uint32_t ecb_gray_encode (uint32_t b) { return ecb_gray_encode32 (b); }
		1017	ecb_inline uint64_t ecb_gray_encode (uint64_t b) { return ecb_gray_encode64 (b); }
		1018
		1019	ecb_inline uint8_t ecb_gray_decode (uint8_t g) { return ecb_gray_decode8 (g); }
		1020	ecb_inline uint16_t ecb_gray_decode (uint16_t g) { return ecb_gray_decode16 (g); }
		1021	ecb_inline uint32_t ecb_gray_decode (uint32_t g) { return ecb_gray_decode32 (g); }
		1022	ecb_inline uint64_t ecb_gray_decode (uint64_t g) { return ecb_gray_decode64 (g); }
		1023
		1024	#endif
		1025
		1026	/*****************************************************************************/
		1027	/* 2d hilbert curves */
		1028
		1029	/* algorithm from the book Hacker's Delight, modified to not */
		1030	/* run into undefined behaviour for n==16 */
		1031	static uint32_t ecb_hilbert2d_index_to_coord32 (int n, uint32_t s);
		1032	static uint32_t ecb_hilbert2d_index_to_coord32 (int n, uint32_t s)
		1033	{
		1034	uint32_t comp, swap, cs, t, sr;
		1035
		1036	/* pad s on the left (unused) bits with 01 (no change groups) */
		1037	s |= 0x55555555U << n << n;
		1038	/* "s shift right" */
		1039	sr = (s >> 1) & 0x55555555U;
		1040	/* compute complement and swap info in two-bit groups */
		1041	cs = ((s & 0x55555555U) + sr) ^ 0x55555555U;
		1042
		1043	/* parallel prefix xor op to propagate both complement
		1044	* and swap info together from left to right (there is
		1045	* no step "cs ^= cs >> 1", so in effect it computes
		1046	* two independent parallel prefix operations on two
		1047	* interleaved sets of sixteen bits).
		1048	*/
		1049	cs ^= cs >> 2;
		1050	cs ^= cs >> 4;
		1051	cs ^= cs >> 8;
		1052	cs ^= cs >> 16;
		1053
		1054	/* separate swap and complement bits */
		1055	swap = cs & 0x55555555U;
		1056	comp = (cs >> 1) & 0x55555555U;
		1057
		1058	/* calculate coordinates in odd and even bit positions */
		1059	t = (s & swap) ^ comp;
		1060	s = s ^ sr ^ t ^ (t << 1);
		1061
		1062	/* unpad/clear out any junk on the left */
		1063	s = s & ((1 << n << n) - 1);
		1064
		1065	/* Now "unshuffle" to separate the x and y bits. */
		1066	t = (s ^ (s >> 1)) & 0x22222222U; s ^= t ^ (t << 1);
		1067	t = (s ^ (s >> 2)) & 0x0c0c0c0cU; s ^= t ^ (t << 2);
		1068	t = (s ^ (s >> 4)) & 0x00f000f0U; s ^= t ^ (t << 4);
		1069	t = (s ^ (s >> 8)) & 0x0000ff00U; s ^= t ^ (t << 8);
		1070
		1071	/* now s contains two 16-bit coordinates */
		1072	return s;
		1073	}
		1074
		1075	/* 64 bit, a straightforward extension to the 32 bit case */
		1076	static uint64_t ecb_hilbert2d_index_to_coord64 (int n, uint64_t s);
		1077	static uint64_t ecb_hilbert2d_index_to_coord64 (int n, uint64_t s)
		1078	{
		1079	uint64_t comp, swap, cs, t, sr;
		1080
		1081	/* pad s on the left (unused) bits with 01 (no change groups) */
		1082	s |= 0x5555555555555555U << n << n;
		1083	/* "s shift right" */
		1084	sr = (s >> 1) & 0x5555555555555555U;
		1085	/* compute complement and swap info in two-bit groups */
		1086	cs = ((s & 0x5555555555555555U) + sr) ^ 0x5555555555555555U;
		1087
		1088	/* parallel prefix xor op to propagate both complement
		1089	* and swap info together from left to right (there is
		1090	* no step "cs ^= cs >> 1", so in effect it computes
		1091	* two independent parallel prefix operations on two
		1092	* interleaved sets of thirty-two bits).
		1093	*/
		1094	cs ^= cs >> 2;
		1095	cs ^= cs >> 4;
		1096	cs ^= cs >> 8;
		1097	cs ^= cs >> 16;
		1098	cs ^= cs >> 32;
		1099
		1100	/* separate swap and complement bits */
		1101	swap = cs & 0x5555555555555555U;
		1102	comp = (cs >> 1) & 0x5555555555555555U;
		1103
		1104	/* calculate coordinates in odd and even bit positions */
		1105	t = (s & swap) ^ comp;
		1106	s = s ^ sr ^ t ^ (t << 1);
		1107
		1108	/* unpad/clear out any junk on the left */
		1109	s = s & ((1 << n << n) - 1);
		1110
		1111	/* Now "unshuffle" to separate the x and y bits. */
		1112	t = (s ^ (s >> 1)) & 0x2222222222222222U; s ^= t ^ (t << 1);
		1113	t = (s ^ (s >> 2)) & 0x0c0c0c0c0c0c0c0cU; s ^= t ^ (t << 2);
		1114	t = (s ^ (s >> 4)) & 0x00f000f000f000f0U; s ^= t ^ (t << 4);
		1115	t = (s ^ (s >> 8)) & 0x0000ff000000ff00U; s ^= t ^ (t << 8);
		1116	t = (s ^ (s >> 16)) & 0x00000000ffff0000U; s ^= t ^ (t << 16);
		1117
		1118	/* now s contains two 32-bit coordinates */
		1119	return s;
		1120	}
		1121
		1122	/* algorithm from the book Hacker's Delight, but a similar algorithm*/
		1123	/* is given in https://doi.org/10.1002/spe.4380160103 */
		1124	/* this has been slightly improved over the original version */
		1125	ecb_function_ uint32_t ecb_hilbert2d_coord_to_index32 (int n, uint32_t xy);
		1126	ecb_function_ uint32_t ecb_hilbert2d_coord_to_index32 (int n, uint32_t xy)
		1127	{
		1128	uint32_t row;
		1129	uint32_t state = 0;
		1130	uint32_t s = 0;
		1131
		1132	do
		1133	{
		1134	--n;
		1135
		1136	row = 4 * state
		1137	| (2 & (xy >> n >> 15))
		1138	| (1 & (xy >> n ));
		1139
		1140	/* these funky constants are lookup tables for two-bit values */
		1141	s = (s << 2) | (0x361e9cb4U >> 2 * row) & 3;
		1142	state = (0x8fe65831U >> 2 * row) & 3;
		1143	}
		1144	while (n > 0);
		1145
		1146	return s;
		1147	}
		1148
		1149	/* 64 bit, essentially the same as 32 bit */
		1150	ecb_function_ uint64_t ecb_hilbert2d_coord_to_index64 (int n, uint64_t xy);
		1151	ecb_function_ uint64_t ecb_hilbert2d_coord_to_index64 (int n, uint64_t xy)
		1152	{
		1153	uint32_t row;
		1154	uint32_t state = 0;
		1155	uint64_t s = 0;
		1156
		1157	do
		1158	{
		1159	--n;
		1160
		1161	row = 4 * state
		1162	| (2 & (xy >> n >> 31))
		1163	| (1 & (xy >> n ));
		1164
		1165	/* these funky constants are lookup tables for two-bit values */
		1166	s = (s << 2) | (0x361e9cb4U >> 2 * row) & 3;
		1167	state = (0x8fe65831U >> 2 * row) & 3;
		1168	}
		1169	while (n > 0);
		1170
		1171	return s;
		1172	}
		1173
		1174	/*****************************************************************************/
		1175	/* division */
633		1176
634	#if ECB_GCC_VERSION(3,0) || ECB_C99	1177	#if ECB_GCC_VERSION(3,0) || ECB_C99
		1178	/* C99 tightened the definition of %, so we can use a more efficient version */
635	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))	1179	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
636	#else	1180	#else
637	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))	1181	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
638	#endif	1182	#endif
639		1183
…		…
650	}	1194	}
651	#else	1195	#else
652	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))	1196	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
653	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))	1197	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
654	#endif	1198	#endif
		1199
		1200	/*****************************************************************************/
		1201	/* array length */
655		1202
656	#if ecb_cplusplus_does_not_suck	1203	#if ecb_cplusplus_does_not_suck
657	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */	1204	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
658	template<typename T, int N>	1205	template<typename T, int N>
659	static inline int ecb_array_length (const T (&arr)[N])	1206	static inline int ecb_array_length (const T (&arr)[N])
…		…
661	return N;	1208	return N;
662	}	1209	}
663	#else	1210	#else
664	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	1211	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
665	#endif	1212	#endif
		1213
		1214	/*****************************************************************************/
		1215	/* IEEE 754-2008 half float conversions */
		1216
		1217	ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
		1218	ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x)
		1219	{
		1220	unsigned int s = (x & 0x8000) << (31 - 15);
		1221	int e = (x >> 10) & 0x001f;
		1222	unsigned int m = x & 0x03ff;
		1223
		1224	if (ecb_expect_false (e == 31))
		1225	/* infinity or NaN */
		1226	e = 255 - (127 - 15);
		1227	else if (ecb_expect_false (!e))
		1228	{
		1229	if (ecb_expect_true (!m))
		1230	/* zero, handled by code below by forcing e to 0 */
		1231	e = 0 - (127 - 15);
		1232	else
		1233	{
		1234	/* subnormal, renormalise */
		1235	unsigned int s = 10 - ecb_ld32 (m);
		1236
		1237	m = (m << s) & 0x3ff; /* mask implicit bit */
		1238	e -= s - 1;
		1239	}
		1240	}
		1241
		1242	/* e and m now are normalised, or zero, (or inf or nan) */
		1243	e += 127 - 15;
		1244
		1245	return s | (e << 23) | (m << (23 - 10));
		1246	}
		1247
		1248	ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
		1249	ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x)
		1250	{
		1251	unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
		1252	int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
		1253	unsigned int m = x & 0x007fffff;
		1254
		1255	x &= 0x7fffffff;
		1256
		1257	/* if it's within range of binary16 normals, use fast path */
		1258	if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
		1259	{
		1260	/* mantissa round-to-even */
		1261	m += 0x00000fff + ((m >> (23 - 10)) & 1);
		1262
		1263	/* handle overflow */
		1264	if (ecb_expect_false (m >= 0x00800000))
		1265	{
		1266	m >>= 1;
		1267	e += 1;
		1268	}
		1269
		1270	return s | (e << 10) | (m >> (23 - 10));
		1271	}
		1272
		1273	/* handle large numbers and infinity */
		1274	if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
		1275	return s | 0x7c00;
		1276
		1277	/* handle zero, subnormals and small numbers */
		1278	if (ecb_expect_true (x < 0x38800000))
		1279	{
		1280	/* zero */
		1281	if (ecb_expect_true (!x))
		1282	return s;
		1283
		1284	/* handle subnormals */
		1285
		1286	/* too small, will be zero */
		1287	if (e < (14 - 24)) /* might not be sharp, but is good enough */
		1288	return s;
		1289
		1290	m |= 0x00800000; /* make implicit bit explicit */
		1291
		1292	/* very tricky - we need to round to the nearest e (+10) bit value */
		1293	{
		1294	unsigned int bits = 14 - e;
		1295	unsigned int half = (1 << (bits - 1)) - 1;
		1296	unsigned int even = (m >> bits) & 1;
		1297
		1298	/* if this overflows, we will end up with a normalised number */
		1299	m = (m + half + even) >> bits;
		1300	}
		1301
		1302	return s | m;
		1303	}
		1304
		1305	/* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
		1306	m >>= 13;
		1307
		1308	return s | 0x7c00 | m | !m;
		1309	}
		1310
		1311	/*******************************************************************************/
		1312	/* fast integer to ascii */
		1313
		1314	/*
		1315	* This code is pretty complicated because it is general. The idea behind it,
		1316	* however, is pretty simple: first, the number is multiplied with a scaling
		1317	* factor (2**bits / 10**(digits-1)) to convert the integer into a fixed-point
		1318	* number with the first digit in the upper bits.
		1319	* Then this digit is converted to text and masked out. The resulting number
		1320	* is then multiplied by 10, by multiplying the fixed point representation
		1321	* by 5 and shifting the (binary) decimal point one to the right, so a 4.28
		1322	* format becomes 5.27, 6.26 and so on.
		1323	* The rest involves only advancing the pointer if we already generated a
		1324	* non-zero digit, so leading zeroes are overwritten.
		1325	*/
		1326
		1327	/* simply return a mask with "bits" bits set */
		1328	#define ecb_i2a_mask(type,bits) ((((type)1) << (bits)) - 1)
		1329
		1330	/* oputput a single digit. maskvalue is 10**digitidx */
		1331	#define ecb_i2a_digit(type,bits,digitmask,maskvalue,digitidx) \
		1332	if (digitmask >= maskvalue) /* constant, used to decide how many digits to generate */ \
		1333	{ \
		1334	char digit = x >> (bits - digitidx); /* calculate the topmost digit */ \
		1335	*ptr = digit + '0'; /* output it */ \
		1336	nz = (digitmask == maskvalue) || nz || digit; /* first term == always output last digit */ \
		1337	ptr += nz; /* output digit only if non-zero digit seen */ \
		1338	x = (x & ecb_i2a_mask (type, bits - digitidx)) * 5; /* *10, but shift decimal point right */ \
		1339	}
		1340
		1341	/* convert integer to fixed point format and multiply out digits, highest first */
		1342	/* requires magic constants: max. digits and number of bits after the decimal point */
		1343	#define ecb_i2a_def(suffix,ptr,v,type,bits,digitmask,lz) \
		1344	ecb_inline char *ecb_i2a_ ## suffix (char *ptr, uint32_t u) \
		1345	{ \
		1346	char nz = lz; /* non-zero digit seen? */ \
		1347	/* convert to x.bits fixed-point */ \
		1348	type x = u * ((ecb_i2a_mask (type, bits) + digitmask) / digitmask); \
		1349	/* output up to 10 digits */ \
		1350	ecb_i2a_digit (type,bits,digitmask, 1, 0); \
		1351	ecb_i2a_digit (type,bits,digitmask, 10, 1); \
		1352	ecb_i2a_digit (type,bits,digitmask, 100, 2); \
		1353	ecb_i2a_digit (type,bits,digitmask, 1000, 3); \
		1354	ecb_i2a_digit (type,bits,digitmask, 10000, 4); \
		1355	ecb_i2a_digit (type,bits,digitmask, 100000, 5); \
		1356	ecb_i2a_digit (type,bits,digitmask, 1000000, 6); \
		1357	ecb_i2a_digit (type,bits,digitmask, 10000000, 7); \
		1358	ecb_i2a_digit (type,bits,digitmask, 100000000, 8); \
		1359	ecb_i2a_digit (type,bits,digitmask, 1000000000, 9); \
		1360	return ptr; \
		1361	}
		1362
		1363	/* predefined versions of the above, for various digits */
		1364	/* ecb_i2a_xN = almost N digits, limit defined by macro */
		1365	/* ecb_i2a_N = up to N digits, leading zeroes suppressed */
		1366	/* ecb_i2a_0N = exactly N digits, including leading zeroes */
		1367
		1368	/* non-leading-zero versions, limited range */
		1369	#define ECB_I2A_MAX_X5 59074 /* limit for ecb_i2a_x5 */
		1370	#define ECB_I2A_MAX_X10 2932500665 /* limit for ecb_i2a_x10 */
		1371	ecb_i2a_def ( x5, ptr, v, uint32_t, 26, 10000, 0)
		1372	ecb_i2a_def (x10, ptr, v, uint64_t, 60, 1000000000, 0)
		1373
		1374	/* non-leading zero versions, all digits, 4 and 9 are optimal for 32/64 bit */
		1375	ecb_i2a_def ( 2, ptr, v, uint32_t, 10, 10, 0)
		1376	ecb_i2a_def ( 3, ptr, v, uint32_t, 12, 100, 0)
		1377	ecb_i2a_def ( 4, ptr, v, uint32_t, 26, 1000, 0)
		1378	ecb_i2a_def ( 5, ptr, v, uint64_t, 30, 10000, 0)
		1379	ecb_i2a_def ( 6, ptr, v, uint64_t, 36, 100000, 0)
		1380	ecb_i2a_def ( 7, ptr, v, uint64_t, 44, 1000000, 0)
		1381	ecb_i2a_def ( 8, ptr, v, uint64_t, 50, 10000000, 0)
		1382	ecb_i2a_def ( 9, ptr, v, uint64_t, 56, 100000000, 0)
		1383
		1384	/* leading-zero versions, all digits, 04 and 09 are optimal for 32/64 bit */
		1385	ecb_i2a_def (02, ptr, v, uint32_t, 10, 10, 1)
		1386	ecb_i2a_def (03, ptr, v, uint32_t, 12, 100, 1)
		1387	ecb_i2a_def (04, ptr, v, uint32_t, 26, 1000, 1)
		1388	ecb_i2a_def (05, ptr, v, uint64_t, 30, 10000, 1)
		1389	ecb_i2a_def (06, ptr, v, uint64_t, 36, 100000, 1)
		1390	ecb_i2a_def (07, ptr, v, uint64_t, 44, 1000000, 1)
		1391	ecb_i2a_def (08, ptr, v, uint64_t, 50, 10000000, 1)
		1392	ecb_i2a_def (09, ptr, v, uint64_t, 56, 100000000, 1)
		1393
		1394	#define ECB_I2A_I32_DIGITS 11
		1395	#define ECB_I2A_U32_DIGITS 10
		1396	#define ECB_I2A_I64_DIGITS 20
		1397	#define ECB_I2A_U64_DIGITS 21
		1398	#define ECB_I2A_MAX_DIGITS 21
		1399
		1400	ecb_function_ char * ecb_i2a_u32 (char *ptr, uint32_t u);
		1401	ecb_function_ char * ecb_i2a_u32 (char *ptr, uint32_t u)
		1402	{
		1403	#if ECB_64BIT_NATIVE
		1404	if (ecb_expect_true (u <= ECB_I2A_MAX_X10))
		1405	ptr = ecb_i2a_x10 (ptr, u);
		1406	else /* x10 almost, but not fully, covers 32 bit */
		1407	{
		1408	uint32_t u1 = u % 1000000000;
		1409	uint32_t u2 = u / 1000000000;
		1410
		1411	*ptr++ = u2 + '0';
		1412	ptr = ecb_i2a_09 (ptr, u1);
		1413	}
		1414	#else
		1415	if (ecb_expect_true (u <= ECB_I2A_MAX_X5))
		1416	ecb_i2a_x5 (ptr, u);
		1417	else if (ecb_expect_true (u <= ECB_I2A_MAX_X5 * 10000))
		1418	{
		1419	uint32_t u1 = u % 10000;
		1420	uint32_t u2 = u / 10000;
		1421
		1422	ptr = ecb_i2a_x5 (ptr, u2);
		1423	ptr = ecb_i2a_04 (ptr, u1);
		1424	}
		1425	else
		1426	{
		1427	uint32_t u1 = u % 10000;
		1428	uint32_t ua = u / 10000;
		1429	uint32_t u2 = ua % 10000;
		1430	uint32_t u3 = ua / 10000;
		1431
		1432	ptr = ecb_i2a_2 (ptr, u3);
		1433	ptr = ecb_i2a_04 (ptr, u2);
		1434	ptr = ecb_i2a_04 (ptr, u1);
		1435	}
		1436	#endif
		1437
		1438	return ptr;
		1439	}
		1440
		1441	ecb_function_ char * ecb_i2a_i32 (char *ptr, int32_t v);
		1442	ecb_function_ char * ecb_i2a_i32 (char *ptr, int32_t v)
		1443	{
		1444	*ptr = '-'; ptr += v < 0;
		1445	uint32_t u = v < 0 ? -(uint32_t)v : v;
		1446
		1447	#if ECB_64BIT_NATIVE
		1448	ptr = ecb_i2a_x10 (ptr, u); /* x10 fully covers 31 bit */
		1449	#else
		1450	ptr = ecb_i2a_u32 (ptr, u);
		1451	#endif
		1452
		1453	return ptr;
		1454	}
		1455
		1456	ecb_function_ char * ecb_i2a_u64 (char *ptr, uint64_t u);
		1457	ecb_function_ char * ecb_i2a_u64 (char *ptr, uint64_t u)
		1458	{
		1459	#if ECB_64BIT_NATIVE
		1460	if (ecb_expect_true (u <= ECB_I2A_MAX_X10))
		1461	ptr = ecb_i2a_x10 (ptr, u);
		1462	else if (ecb_expect_false (u <= ECB_I2A_MAX_X10 * 1000000000))
		1463	{
		1464	uint64_t u1 = u % 1000000000;
		1465	uint64_t u2 = u / 1000000000;
		1466
		1467	ptr = ecb_i2a_x10 (ptr, u2);
		1468	ptr = ecb_i2a_09 (ptr, u1);
		1469	}
		1470	else
		1471	{
		1472	uint64_t u1 = u % 1000000000;
		1473	uint64_t ua = u / 1000000000;
		1474	uint64_t u2 = ua % 1000000000;
		1475	uint64_t u3 = ua / 1000000000;
		1476
		1477	ptr = ecb_i2a_2 (ptr, u3);
		1478	ptr = ecb_i2a_09 (ptr, u2);
		1479	ptr = ecb_i2a_09 (ptr, u1);
		1480	}
		1481	#else
		1482	if (ecb_expect_true (u <= ECB_I2A_MAX_X5))
		1483	ptr = ecb_i2a_x5 (ptr, u);
		1484	else
		1485	{
		1486	uint64_t u1 = u % 10000;
		1487	uint64_t u2 = u / 10000;
		1488
		1489	ptr = ecb_i2a_u64 (ptr, u2);
		1490	ptr = ecb_i2a_04 (ptr, u1);
		1491	}
		1492	#endif
		1493
		1494	return ptr;
		1495	}
		1496
		1497	ecb_function_ char * ecb_i2a_i64 (char *ptr, int64_t v);
		1498	ecb_function_ char * ecb_i2a_i64 (char *ptr, int64_t v)
		1499	{
		1500	*ptr = '-'; ptr += v < 0;
		1501	uint64_t u = v < 0 ? -(uint64_t)v : v;
		1502
		1503	#if ECB_64BIT_NATIVE
		1504	if (ecb_expect_true (u <= ECB_I2A_MAX_X10))
		1505	ptr = ecb_i2a_x10 (ptr, u);
		1506	else if (ecb_expect_false (u <= ECB_I2A_MAX_X10 * 1000000000))
		1507	{
		1508	uint64_t u1 = u % 1000000000;
		1509	uint64_t u2 = u / 1000000000;
		1510
		1511	ptr = ecb_i2a_x10 (ptr, u2);
		1512	ptr = ecb_i2a_09 (ptr, u1);
		1513	}
		1514	else
		1515	{
		1516	uint64_t u1 = u % 1000000000;
		1517	uint64_t ua = u / 1000000000;
		1518	uint64_t u2 = ua % 1000000000;
		1519	uint64_t u3 = ua / 1000000000;
		1520
		1521	/* 2**31 is 19 digits, so the top is exactly one digit */
		1522	*ptr++ = u3 + '0';
		1523	ptr = ecb_i2a_09 (ptr, u2);
		1524	ptr = ecb_i2a_09 (ptr, u1);
		1525	}
		1526	#else
		1527	ptr = ecb_i2a_u64 (ptr, u);
		1528	#endif
		1529
		1530	return ptr;
		1531	}
666		1532
667	/*******************************************************************************/	1533	/*******************************************************************************/
668	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */	1534	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
669		1535
670	/* basically, everything uses "ieee pure-endian" floating point numbers */	1536	/* basically, everything uses "ieee pure-endian" floating point numbers */
…		…
683	|| defined __sh__ \	1549	|| defined __sh__ \
684	|| defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \	1550	|| defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
685	|| (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \	1551	|| (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
686	|| defined __aarch64__	1552	|| defined __aarch64__
687	#define ECB_STDFP 1	1553	#define ECB_STDFP 1
688	#include <string.h> /* for memcpy */
689	#else	1554	#else
690	#define ECB_STDFP 0	1555	#define ECB_STDFP 0
691	#endif	1556	#endif
692		1557
693	#ifndef ECB_NO_LIBM	1558	#ifndef ECB_NO_LIBM
…		…
713	#else	1578	#else
714	#define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))	1579	#define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
715	#define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))	1580	#define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
716	#endif	1581	#endif
717		1582
718	/* converts an ieee half/binary16 to a float */
719	ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
720	ecb_function_ ecb_const float
721	ecb_binary16_to_float (uint16_t x)
722	{
723	int e = (x >> 10) & 0x1f;
724	int m = x & 0x3ff;
725	float r;
726
727	if (!e ) r = ecb_ldexpf (m , -24);
728	else if (e != 31) r = ecb_ldexpf (m + 0x400, e - 25);
729	else if (m ) r = ECB_NAN;
730	else r = ECB_INFINITY;
731
732	return x & 0x8000 ? -r : r;
733	}
734
735	/* convert a float to ieee single/binary32 */	1583	/* convert a float to ieee single/binary32 */
736	ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);	1584	ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
737	ecb_function_ ecb_const uint32_t	1585	ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x)
738	ecb_float_to_binary32 (float x)
739	{	1586	{
740	uint32_t r;	1587	uint32_t r;
741		1588
742	#if ECB_STDFP	1589	#if ECB_STDFP
743	memcpy (&r, &x, 4);	1590	memcpy (&r, &x, 4);
…		…
772	return r;	1619	return r;
773	}	1620	}
774		1621
775	/* converts an ieee single/binary32 to a float */	1622	/* converts an ieee single/binary32 to a float */
776	ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);	1623	ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
777	ecb_function_ ecb_const float	1624	ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x)
778	ecb_binary32_to_float (uint32_t x)
779	{	1625	{
780	float r;	1626	float r;
781		1627
782	#if ECB_STDFP	1628	#if ECB_STDFP
783	memcpy (&r, &x, 4);	1629	memcpy (&r, &x, 4);
…		…
802	return r;	1648	return r;
803	}	1649	}
804		1650
805	/* convert a double to ieee double/binary64 */	1651	/* convert a double to ieee double/binary64 */
806	ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);	1652	ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
807	ecb_function_ ecb_const uint64_t	1653	ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x)
808	ecb_double_to_binary64 (double x)
809	{	1654	{
810	uint64_t r;	1655	uint64_t r;
811		1656
812	#if ECB_STDFP	1657	#if ECB_STDFP
813	memcpy (&r, &x, 8);	1658	memcpy (&r, &x, 8);
…		…
842	return r;	1687	return r;
843	}	1688	}
844		1689
845	/* converts an ieee double/binary64 to a double */	1690	/* converts an ieee double/binary64 to a double */
846	ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);	1691	ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
847	ecb_function_ ecb_const double	1692	ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x)
848	ecb_binary64_to_double (uint64_t x)
849	{	1693	{
850	double r;	1694	double r;
851		1695
852	#if ECB_STDFP	1696	#if ECB_STDFP
853	memcpy (&r, &x, 8);	1697	memcpy (&r, &x, 8);
…		…
870	#endif	1714	#endif
871		1715
872	return r;	1716	return r;
873	}	1717	}
874		1718
875	#endif	1719	/* convert a float to ieee half/binary16 */
		1720	ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
		1721	ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x)
		1722	{
		1723	return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
		1724	}
876		1725
877	#endif	1726	/* convert an ieee half/binary16 to float */
		1727	ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
		1728	ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x)
		1729	{
		1730	return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
		1731	}
878		1732
		1733	#endif
		1734
		1735	#endif
		1736

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