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

Comparing libecb/ecb.h (file contents):
Revision 1.71 by root, Sat Dec 10 11:59:19 2011 UTC vs.
Revision 1.120 by root, Sat Oct 26 09:13:54 2013 UTC

…		…
1	/*	1	/*
2	* libecb - http://software.schmorp.de/pkg/libecb	2	* libecb - http://software.schmorp.de/pkg/libecb
3	*	3	*
4	* Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de>	4	* Copyright (©) 2009-2012 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:
28	*/	28	*/
29		29
30	#ifndef ECB_H	30	#ifndef ECB_H
31	#define ECB_H	31	#define ECB_H
32		32
		33	/* 16 bits major, 16 bits minor */
		34	#define ECB_VERSION 0x00010003
		35
33	#ifdef _WIN32	36	#ifdef _WIN32
34	typedef signed char int8_t;	37	typedef signed char int8_t;
35	typedef unsigned char uint8_t;	38	typedef unsigned char uint8_t;
36	typedef signed short int16_t;	39	typedef signed short int16_t;
37	typedef unsigned short uint16_t;	40	typedef unsigned short uint16_t;
…		…
42	typedef unsigned long long uint64_t;	45	typedef unsigned long long uint64_t;
43	#else /* _MSC_VER \|\| __BORLANDC__ */	46	#else /* _MSC_VER \|\| __BORLANDC__ */
44	typedef signed __int64 int64_t;	47	typedef signed __int64 int64_t;
45	typedef unsigned __int64 uint64_t;	48	typedef unsigned __int64 uint64_t;
46	#endif	49	#endif
		50	#ifdef _WIN64
		51	#define ECB_PTRSIZE 8
		52	typedef uint64_t uintptr_t;
		53	typedef int64_t intptr_t;
		54	#else
		55	#define ECB_PTRSIZE 4
		56	typedef uint32_t uintptr_t;
		57	typedef int32_t intptr_t;
		58	#endif
47	#else	59	#else
48	#include <inttypes.h>	60	#include <inttypes.h>
		61	#if UINTMAX_MAX > 0xffffffffU
		62	#define ECB_PTRSIZE 8
		63	#else
		64	#define ECB_PTRSIZE 4
		65	#endif
		66	#endif
		67
		68	/* work around x32 idiocy by defining proper macros */
		69	#if __x86_64 \|\| _M_AMD64
		70	#if _ILP32
		71	#define ECB_AMD64_X32 1
		72	#else
		73	#define ECB_AMD64 1
		74	#endif
49	#endif	75	#endif
50		76
51	/* many compilers define _GNUC_ to some versions but then only implement	77	/* many compilers define _GNUC_ to some versions but then only implement
52	* what their idiot authors think are the "more important" extensions,	78	* what their idiot authors think are the "more important" extensions,
53	* causing enormous grief in return for some better fake benchmark numbers.	79	* causing enormous grief in return for some better fake benchmark numbers.
54	* or so.	80	* or so.
55	* we try to detect these and simply assume they are not gcc - if they have	81	* we try to detect these and simply assume they are not gcc - if they have
56	* an issue with that they should have done it right in the first place.	82	* an issue with that they should have done it right in the first place.
57	*/	83	*/
58	#ifndef ECB_GCC_VERSION	84	#ifndef ECB_GCC_VERSION
59	#if !defined(__GNUC_MINOR__) \|\| defined(__INTEL_COMPILER) \|\| defined(__SUNPRO_C) \|\| defined(__SUNPRO_CC) \|\| defined(__llvm__) \|\| defined(__clang__)	85	#if !defined __GNUC_MINOR__ \|\| defined __INTEL_COMPILER \|\| defined __SUNPRO_C \|\| defined __SUNPRO_CC \|\| defined __llvm__ \|\| defined __clang__
60	#define ECB_GCC_VERSION(major,minor) 0	86	#define ECB_GCC_VERSION(major,minor) 0
61	#else	87	#else
62	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))	88	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
63	#endif	89	#endif
64	#endif	90	#endif
65		91
		92	#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
		93	#define ECB_C99 (__STDC_VERSION__ >= 199901L)
		94	#define ECB_C11 (__STDC_VERSION__ >= 201112L)
		95	#define ECB_CPP (__cplusplus+0)
		96	#define ECB_CPP11 (__cplusplus >= 201103L)
		97
		98	#if ECB_CPP
		99	#define ECB_EXTERN_C extern "C"
		100	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {
		101	#define ECB_EXTERN_C_END }
		102	#else
		103	#define ECB_EXTERN_C extern
		104	#define ECB_EXTERN_C_BEG
		105	#define ECB_EXTERN_C_END
		106	#endif
		107
66	/*****************************************************************************/	108	/*****************************************************************************/
67		109
68	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */	110	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
69	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */	111	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
70		112
71	#if ECB_NO_THREADS \|\| ECB_NO_SMP	113	#if ECB_NO_THREADS
		114	#define ECB_NO_SMP 1
		115	#endif
		116
		117	#if ECB_NO_SMP
72	#define ECB_MEMORY_FENCE do { } while (0)	118	#define ECB_MEMORY_FENCE do { } while (0)
73	#endif	119	#endif
74		120
75	#ifndef ECB_MEMORY_FENCE	121	#ifndef ECB_MEMORY_FENCE
76	#if ECB_GCC_VERSION(2,5) \|\| defined(__INTEL_COMPILER) \|\| defined(__clang__)	122	#if ECB_GCC_VERSION(2,5) \|\| defined __INTEL_COMPILER \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
77	#if __i386__	123	#if __i386 \|\| __i386__
78	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")	124	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
79	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */	125	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
80	#define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */	126	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
81	#elif __amd64	127	#elif __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__
82	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")	128	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
83	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")	129	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
84	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */	130	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
85	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__	131	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__
86	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")	132	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
87	#elif defined(__ARM_ARCH_6__ ) \|\| defined(__ARM_ARCH_6J__ ) \	133	#elif defined __ARM_ARCH_6__ \|\| defined __ARM_ARCH_6J__ \
88	\|\| defined(__ARM_ARCH_6K__) \|\| defined(__ARM_ARCH_6ZK__)	134	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__
89	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")	135	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
90	#elif defined(__ARM_ARCH_7__ ) \|\| defined(__ARM_ARCH_7A__ ) \	136	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \
91	\|\| defined(__ARM_ARCH_7M__) \|\| defined(__ARM_ARCH_7R__ )	137	\|\| defined __ARM_ARCH_7M__ \|\| defined __ARM_ARCH_7R__
92	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")	138	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
		139	#elif __sparc \|\| __sparc__
		140	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad" : : : "memory")
		141	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
		142	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
		143	#elif defined __s390__ \|\| defined __s390x__
		144	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
		145	#elif defined __mips__
		146	/* GNU/Linux emulates sync on mips1 architectures, so we force its use */
		147	/* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
		148	#define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
		149	#elif defined __alpha__
		150	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
		151	#elif defined __hppa__
		152	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		153	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		154	#elif defined __ia64__
		155	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
		156	#elif defined __m68k__
		157	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		158	#elif defined __m88k__
		159	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
		160	#elif defined __sh__
		161	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
93	#endif	162	#endif
94	#endif	163	#endif
95	#endif	164	#endif
96		165
97	#ifndef ECB_MEMORY_FENCE	166	#ifndef ECB_MEMORY_FENCE
		167	#if ECB_GCC_VERSION(4,7)
		168	/* see comment below (stdatomic.h) about the C11 memory model. */
		169	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
		170
		171	/* The __has_feature syntax from clang is so misdesigned that we cannot use it
		172	* without risking compile time errors with other compilers. We could
		173	* define our own ecb_clang_has_feature, but I just can't be bothered to work
		174	* around this shit time and again.
		175	* #elif defined __clang && __has_feature (cxx_atomic)
		176	* // see comment below (stdatomic.h) about the C11 memory model.
		177	* #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
		178	*/
		179
98	#if ECB_GCC_VERSION(4,4) \|\| defined(__INTEL_COMPILER) \|\| defined(__clang__)	180	#elif ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__
99	#define ECB_MEMORY_FENCE __sync_synchronize ()	181	#define ECB_MEMORY_FENCE __sync_synchronize ()
100	/#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) /
101	/#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) /
102	#elif _MSC_VER >= 1400 /* VC++ 2005 */	182	#elif _MSC_VER >= 1400 /* VC++ 2005 */
103	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)	183	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
104	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()	184	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
105	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */	185	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
106	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()	186	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
107	#elif defined(_WIN32)	187	#elif defined _WIN32
108	#include <WinNT.h>	188	#include <WinNT.h>
109	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */	189	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
		190	#elif __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		191	#include <mbarrier.h>
		192	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
		193	#define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
		194	#define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
		195	#elif __xlC__
		196	#define ECB_MEMORY_FENCE __sync ()
		197	#endif
		198	#endif
		199
		200	#ifndef ECB_MEMORY_FENCE
		201	#if ECB_C11 && !defined __STDC_NO_ATOMICS__
		202	/* we assume that these memory fences work on all variables/all memory accesses, */
		203	/* not just C11 atomics and atomic accesses */
		204	#include <stdatomic.h>
		205	/* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
		206	/* any fence other than seq_cst, which isn't very efficient for us. */
		207	/* Why that is, we don't know - either the C11 memory model is quite useless */
		208	/* for most usages, or gcc and clang have a bug */
		209	/* I currently lean towards the latter, and inefficiently implement */
		210	/* all three of ecb's fences as a seq_cst fence */
		211	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
110	#endif	212	#endif
111	#endif	213	#endif
112		214
113	#ifndef ECB_MEMORY_FENCE	215	#ifndef ECB_MEMORY_FENCE
114	#if !ECB_AVOID_PTHREADS	216	#if !ECB_AVOID_PTHREADS
…		…
126	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;	228	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
127	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)	229	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
128	#endif	230	#endif
129	#endif	231	#endif
130		232
131	#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)	233	#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
132	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE	234	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
133	#endif	235	#endif
134		236
135	#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)	237	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
136	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE	238	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
137	#endif	239	#endif
138		240
139	/*****************************************************************************/	241	/*****************************************************************************/
140
141	#define ECB_C99 (__STDC_VERSION__ >= 199901L)
142		242
143	#if __cplusplus	243	#if __cplusplus
144	#define ecb_inline static inline	244	#define ecb_inline static inline
145	#elif ECB_GCC_VERSION(2,5)	245	#elif ECB_GCC_VERSION(2,5)
146	#define ecb_inline static __inline__	246	#define ecb_inline static __inline__
…		…
185	#elif ECB_GCC_VERSION(3,0)	285	#elif ECB_GCC_VERSION(3,0)
186	#define ecb_decltype(x) __typeof(x)	286	#define ecb_decltype(x) __typeof(x)
187	#endif	287	#endif
188		288
189	#define ecb_noinline ecb_attribute ((__noinline__))	289	#define ecb_noinline ecb_attribute ((__noinline__))
190	#define ecb_noreturn ecb_attribute ((__noreturn__))
191	#define ecb_unused ecb_attribute ((__unused__))	290	#define ecb_unused ecb_attribute ((__unused__))
192	#define ecb_const ecb_attribute ((__const__))	291	#define ecb_const ecb_attribute ((__const__))
193	#define ecb_pure ecb_attribute ((__pure__))	292	#define ecb_pure ecb_attribute ((__pure__))
		293
		294	#if ECB_C11
		295	#define ecb_noreturn _Noreturn
		296	#else
		297	#define ecb_noreturn ecb_attribute ((__noreturn__))
		298	#endif
194		299
195	#if ECB_GCC_VERSION(4,3)	300	#if ECB_GCC_VERSION(4,3)
196	#define ecb_artificial ecb_attribute ((__artificial__))	301	#define ecb_artificial ecb_attribute ((__artificial__))
197	#define ecb_hot ecb_attribute ((__hot__))	302	#define ecb_hot ecb_attribute ((__hot__))
198	#define ecb_cold ecb_attribute ((__cold__))	303	#define ecb_cold ecb_attribute ((__cold__))
…		…
289		394
290	return r + ecb_ld32 (x);	395	return r + ecb_ld32 (x);
291	}	396	}
292	#endif	397	#endif
293		398
		399	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
		400	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
		401	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
		402	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
		403
294	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;	404	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
295	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)	405	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
296	{	406	{
297	return ( (x * 0x0802U & 0x22110U)	407	return ( (x * 0x0802U & 0x22110U)
298	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;	408	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
…		…
377		487
378	#if ECB_GCC_VERSION(4,5)	488	#if ECB_GCC_VERSION(4,5)
379	#define ecb_unreachable() __builtin_unreachable ()	489	#define ecb_unreachable() __builtin_unreachable ()
380	#else	490	#else
381	/* this seems to work fine, but gcc always emits a warning for it :/ */	491	/* this seems to work fine, but gcc always emits a warning for it :/ */
382	ecb_function_ void ecb_unreachable (void) ecb_noreturn;	492	ecb_inline void ecb_unreachable (void) ecb_noreturn;
383	ecb_function_ void ecb_unreachable (void) { }	493	ecb_inline void ecb_unreachable (void) { }
384	#endif	494	#endif
385		495
386	/* try to tell the compiler that some condition is definitely true */	496	/* try to tell the compiler that some condition is definitely true */
387	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)	497	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
388		498
389	ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;	499	ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
390	ecb_function_ unsigned char	500	ecb_inline unsigned char
391	ecb_byteorder_helper (void)	501	ecb_byteorder_helper (void)
392	{	502	{
393	const uint32_t u = 0x11223344;	503	/* the union code still generates code under pressure in gcc, */
394	return (unsigned char )&u;	504	/* but less than using pointers, and always seems to */
		505	/* successfully return a constant. */
		506	/* the reason why we have this horrible preprocessor mess */
		507	/* is to avoid it in all cases, at least on common architectures */
		508	/* or when using a recent enough gcc version (>= 4.6) */
		509	#if __i386 \|\| __i386__ \|\| _M_X86 \|\| __amd64 \|\| __amd64__ \|\| _M_X64
		510	return 0x44;
		511	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
		512	return 0x44;
		513	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
		514	return 0x11;
		515	#else
		516	union
		517	{
		518	uint32_t i;
		519	uint8_t c;
		520	} u = { 0x11223344 };
		521	return u.c;
		522	#endif
395	}	523	}
396		524
397	ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;	525	ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
398	ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }	526	ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
399	ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;	527	ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
400	ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }	528	ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
401		529
402	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99	530	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
403	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))	531	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
404	#else	532	#else
405	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))	533	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
…		…
430	}	558	}
431	#else	559	#else
432	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	560	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
433	#endif	561	#endif
434		562
		563	/*******************************************************************************/
		564	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
		565
		566	/* basically, everything uses "ieee pure-endian" floating point numbers */
		567	/* the only noteworthy exception is ancient armle, which uses order 43218765 */
		568	#if 0 \
		569	\|\| __i386 \|\| __i386__ \
		570	\|\| __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__ \
		571	\|\| __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__ \
		572	\|\| defined __arm__ && defined __ARM_EABI__ \
		573	\|\| defined __s390__ \|\| defined __s390x__ \
		574	\|\| defined __mips__ \
		575	\|\| defined __alpha__ \
		576	\|\| defined __hppa__ \
		577	\|\| defined __ia64__ \
		578	\|\| defined __m68k__ \
		579	\|\| defined __m88k__ \
		580	\|\| defined __sh__ \
		581	\|\| defined _M_IX86 \|\| defined _M_AMD64 \|\| defined _M_IA64
		582	#define ECB_STDFP 1
		583	#include <string.h> /* for memcpy */
		584	#else
		585	#define ECB_STDFP 0
		586	#endif
		587
		588	#ifndef ECB_NO_LIBM
		589
		590	#include <math.h> /* for frexp, ldexp */
		591
		592	/* converts an ieee half/binary16 to a float */
		593	ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
		594	ecb_function_ float
		595	ecb_binary16_to_float (uint16_t x)
		596	{
		597	int e = (x >> 10) & 0x1f;
		598	int m = x & 0x3ff;
		599	float r;
		600
		601	if (!e)
		602	r = ldexpf (m , -24);
		603	else if (e != 31)
		604	r = ldexpf (m + 0x400, e - 25);
		605	else if (m)
		606	#ifdef NAN
		607	r = NAN;
		608	#endif
		609	else
		610	r = INFINITY;
		611
		612	return x & 0x8000 ? -r : r;
		613	}
		614
		615	/* convert a float to ieee single/binary32 */
		616	ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
		617	ecb_function_ uint32_t
		618	ecb_float_to_binary32 (float x)
		619	{
		620	uint32_t r;
		621
		622	#if ECB_STDFP
		623	memcpy (&r, &x, 4);
		624	#else
		625	/* slow emulation, works for anything but -0 */
		626	uint32_t m;
		627	int e;
		628
		629	if (x == 0e0f ) return 0x00000000U;
		630	if (x > +3.40282346638528860e+38f) return 0x7f800000U;
		631	if (x < -3.40282346638528860e+38f) return 0xff800000U;
		632	if (x != x ) return 0x7fbfffffU;
		633
		634	m = frexpf (x, &e) * 0x1000000U;
		635
		636	r = m & 0x80000000U;
		637
		638	if (r)
		639	m = -m;
		640
		641	if (e <= -126)
		642	{
		643	m &= 0xffffffU;
		644	m >>= (-125 - e);
		645	e = -126;
		646	}
		647
		648	r \|= (e + 126) << 23;
		649	r \|= m & 0x7fffffU;
435	#endif	650	#endif
436		651
		652	return r;
		653	}
		654
		655	/* converts an ieee single/binary32 to a float */
		656	ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
		657	ecb_function_ float
		658	ecb_binary32_to_float (uint32_t x)
		659	{
		660	float r;
		661
		662	#if ECB_STDFP
		663	memcpy (&r, &x, 4);
		664	#else
		665	/* emulation, only works for normals and subnormals and +0 */
		666	int neg = x >> 31;
		667	int e = (x >> 23) & 0xffU;
		668
		669	x &= 0x7fffffU;
		670
		671	if (e)
		672	x \|= 0x800000U;
		673	else
		674	e = 1;
		675
		676	/* we distrust ldexpf a bit and do the 2*-24 scaling by an extra multiply /
		677	r = ldexpf (x * (0.5f / 0x800000U), e - 126);
		678
		679	r = neg ? -r : r;
		680	#endif
		681
		682	return r;
		683	}
		684
		685	/* convert a double to ieee double/binary64 */
		686	ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
		687	ecb_function_ uint64_t
		688	ecb_double_to_binary64 (double x)
		689	{
		690	uint64_t r;
		691
		692	#if ECB_STDFP
		693	memcpy (&r, &x, 8);
		694	#else
		695	/* slow emulation, works for anything but -0 */
		696	uint64_t m;
		697	int e;
		698
		699	if (x == 0e0 ) return 0x0000000000000000U;
		700	if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
		701	if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
		702	if (x != x ) return 0X7ff7ffffffffffffU;
		703
		704	m = frexp (x, &e) * 0x20000000000000U;
		705
		706	r = m & 0x8000000000000000;;
		707
		708	if (r)
		709	m = -m;
		710
		711	if (e <= -1022)
		712	{
		713	m &= 0x1fffffffffffffU;
		714	m >>= (-1021 - e);
		715	e = -1022;
		716	}
		717
		718	r \|= ((uint64_t)(e + 1022)) << 52;
		719	r \|= m & 0xfffffffffffffU;
		720	#endif
		721
		722	return r;
		723	}
		724
		725	/* converts an ieee double/binary64 to a double */
		726	ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
		727	ecb_function_ double
		728	ecb_binary64_to_double (uint64_t x)
		729	{
		730	double r;
		731
		732	#if ECB_STDFP
		733	memcpy (&r, &x, 8);
		734	#else
		735	/* emulation, only works for normals and subnormals and +0 */
		736	int neg = x >> 63;
		737	int e = (x >> 52) & 0x7ffU;
		738
		739	x &= 0xfffffffffffffU;
		740
		741	if (e)
		742	x \|= 0x10000000000000U;
		743	else
		744	e = 1;
		745
		746	/* we distrust ldexp a bit and do the 2*-53 scaling by an extra multiply /
		747	r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
		748
		749	r = neg ? -r : r;
		750	#endif
		751
		752	return r;
		753	}
		754
		755	#endif
		756
		757	#endif
		758

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Comparing libecb/ecb.h (file contents): Revision 1.71 by root, Sat Dec 10 11:59:19 2011 UTC vs. Revision 1.120 by root, Sat Oct 26 09:13:54 2013 UTC

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Comparing libecb/ecb.h (file contents):
Revision 1.71 by root, Sat Dec 10 11:59:19 2011 UTC vs.
Revision 1.120 by root, Sat Oct 26 09:13:54 2013 UTC