[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 1.128 by root, Thu Jan 9 05:16:12 2014 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 (©) 2009-2013 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 __amd64 \|\| __x86_64 \|\| _M_AMD64 \|\| _M_X64
		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_CPP (__cplusplus+0)
		93	#define ECB_CPP11 (__cplusplus >= 201103L)
		94
		95	#if ECB_CPP
		96	#define ECB_C 0
		97	#define ECB_STDC_VERSION 0
		98	#else
		99	#define ECB_C 1
		100	#define ECB_STDC_VERSION __STDC_VERSION__
		101	#endif
		102
		103	#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
		104	#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
		105
		106	#if ECB_CPP
		107	#define ECB_EXTERN_C extern "C"
		108	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {
		109	#define ECB_EXTERN_C_END }
		110	#else
		111	#define ECB_EXTERN_C extern
		112	#define ECB_EXTERN_C_BEG
		113	#define ECB_EXTERN_C_END
		114	#endif
		115
66	/*****************************************************************************/	116	/*****************************************************************************/
67		117
68	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */	118	/* 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 */	119	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
70		120
71	#if ECB_NO_THREADS \|\| ECB_NO_SMP	121	#if ECB_NO_THREADS
		122	#define ECB_NO_SMP 1
		123	#endif
		124
		125	#if ECB_NO_SMP
72	#define ECB_MEMORY_FENCE do { } while (0)	126	#define ECB_MEMORY_FENCE do { } while (0)
73	#endif	127	#endif
74		128
75	#ifndef ECB_MEMORY_FENCE	129	#ifndef ECB_MEMORY_FENCE
76	#if ECB_GCC_VERSION(2,5) \|\| defined(__INTEL_COMPILER) \|\| defined(__clang__)	130	#if ECB_GCC_VERSION(2,5) \|\| defined __INTEL_COMPILER \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
77	#if __i386__	131	#if __i386 \|\| __i386__
78	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")	132	#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 */	133	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
80	#define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */	134	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
81	#elif __amd64	135	#elif __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__
82	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")	136	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
83	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")	137	#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 */	138	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
85	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__	139	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__
86	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")	140	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
87	#elif defined(__ARM_ARCH_6__ ) \|\| defined(__ARM_ARCH_6J__ ) \	141	#elif defined __ARM_ARCH_6__ \|\| defined __ARM_ARCH_6J__ \
88	\|\| defined(__ARM_ARCH_6K__) \|\| defined(__ARM_ARCH_6ZK__)	142	\|\| 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")	143	#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__ ) \	144	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \
91	\|\| defined(__ARM_ARCH_7M__) \|\| defined(__ARM_ARCH_7R__ )	145	\|\| defined __ARM_ARCH_7M__ \|\| defined __ARM_ARCH_7R__
92	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")	146	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
		147	#elif (__sparc \|\| __sparc__) && !__sparcv8
		148	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad" : : : "memory")
		149	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
		150	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
		151	#elif defined __s390__ \|\| defined __s390x__
		152	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
		153	#elif defined __mips__
		154	/* GNU/Linux emulates sync on mips1 architectures, so we force its use */
		155	/* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
		156	#define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
		157	#elif defined __alpha__
		158	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
		159	#elif defined __hppa__
		160	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		161	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		162	#elif defined __ia64__
		163	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
		164	#elif defined __m68k__
		165	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		166	#elif defined __m88k__
		167	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
		168	#elif defined __sh__
		169	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
93	#endif	170	#endif
94	#endif	171	#endif
95	#endif	172	#endif
96		173
97	#ifndef ECB_MEMORY_FENCE	174	#ifndef ECB_MEMORY_FENCE
		175	#if ECB_GCC_VERSION(4,7)
		176	/* see comment below (stdatomic.h) about the C11 memory model. */
		177	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
		178	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
		179	#define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
		180
		181	/* The __has_feature syntax from clang is so misdesigned that we cannot use it
		182	* without risking compile time errors with other compilers. We could
		183	* define our own ecb_clang_has_feature, but I just can't be bothered to work
		184	* around this shit time and again.
		185	* #elif defined __clang && __has_feature (cxx_atomic)
		186	* // see comment below (stdatomic.h) about the C11 memory model.
		187	* #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
		188	* #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
		189	* #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
		190	*/
		191
98	#if ECB_GCC_VERSION(4,4) \|\| defined(__INTEL_COMPILER) \|\| defined(__clang__)	192	#elif ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__
99	#define ECB_MEMORY_FENCE __sync_synchronize ()	193	#define ECB_MEMORY_FENCE __sync_synchronize ()
100	/#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) /	194	#elif _MSC_VER >= 1500 /* VC++ 2008 */
101	/#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) /	195	/* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
		196	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		197	#define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
		198	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
		199	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
102	#elif _MSC_VER >= 1400 /* VC++ 2005 */	200	#elif _MSC_VER >= 1400 /* VC++ 2005 */
103	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)	201	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
104	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()	202	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
105	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */	203	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
106	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()	204	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
107	#elif defined(_WIN32)	205	#elif defined _WIN32
108	#include <WinNT.h>	206	#include <WinNT.h>
109	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */	207	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
		208	#elif __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		209	#include <mbarrier.h>
		210	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
		211	#define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
		212	#define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
		213	#elif __xlC__
		214	#define ECB_MEMORY_FENCE __sync ()
		215	#endif
		216	#endif
		217
		218	#ifndef ECB_MEMORY_FENCE
		219	#if ECB_C11 && !defined __STDC_NO_ATOMICS__
		220	/* we assume that these memory fences work on all variables/all memory accesses, */
		221	/* not just C11 atomics and atomic accesses */
		222	#include <stdatomic.h>
		223	/* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
		224	/* any fence other than seq_cst, which isn't very efficient for us. */
		225	/* Why that is, we don't know - either the C11 memory model is quite useless */
		226	/* for most usages, or gcc and clang have a bug */
		227	/* I currently lean towards the latter, and inefficiently implement */
		228	/* all three of ecb's fences as a seq_cst fence */
		229	/* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
		230	/* for all __atomic_thread_fence's except seq_cst */
		231	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
110	#endif	232	#endif
111	#endif	233	#endif
112		234
113	#ifndef ECB_MEMORY_FENCE	235	#ifndef ECB_MEMORY_FENCE
114	#if !ECB_AVOID_PTHREADS	236	#if !ECB_AVOID_PTHREADS
…		…
126	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;	248	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)	249	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
128	#endif	250	#endif
129	#endif	251	#endif
130		252
131	#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)	253	#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
132	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE	254	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
133	#endif	255	#endif
134		256
135	#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)	257	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
136	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE	258	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
137	#endif	259	#endif
138		260
139	/*****************************************************************************/	261	/*****************************************************************************/
140
141	#define ECB_C99 (__STDC_VERSION__ >= 199901L)
142		262
143	#if __cplusplus	263	#if __cplusplus
144	#define ecb_inline static inline	264	#define ecb_inline static inline
145	#elif ECB_GCC_VERSION(2,5)	265	#elif ECB_GCC_VERSION(2,5)
146	#define ecb_inline static __inline__	266	#define ecb_inline static __inline__
…		…
172	#define ecb_is_constant(expr) __builtin_constant_p (expr)	292	#define ecb_is_constant(expr) __builtin_constant_p (expr)
173	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))	293	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
174	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)	294	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
175	#else	295	#else
176	#define ecb_attribute(attrlist)	296	#define ecb_attribute(attrlist)
		297
		298	/* possible C11 impl for integral types
		299	typedef struct ecb_is_constant_struct ecb_is_constant_struct;
		300	#define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct )0 : (void )((expr) - (expr)), ecb_is_constant_struct : 0, default: 1)) /
		301
177	#define ecb_is_constant(expr) 0	302	#define ecb_is_constant(expr) 0
178	#define ecb_expect(expr,value) (expr)	303	#define ecb_expect(expr,value) (expr)
179	#define ecb_prefetch(addr,rw,locality)	304	#define ecb_prefetch(addr,rw,locality)
180	#endif	305	#endif
181		306
…		…
185	#elif ECB_GCC_VERSION(3,0)	310	#elif ECB_GCC_VERSION(3,0)
186	#define ecb_decltype(x) __typeof(x)	311	#define ecb_decltype(x) __typeof(x)
187	#endif	312	#endif
188		313
189	#define ecb_noinline ecb_attribute ((__noinline__))	314	#define ecb_noinline ecb_attribute ((__noinline__))
190	#define ecb_noreturn ecb_attribute ((__noreturn__))
191	#define ecb_unused ecb_attribute ((__unused__))	315	#define ecb_unused ecb_attribute ((__unused__))
192	#define ecb_const ecb_attribute ((__const__))	316	#define ecb_const ecb_attribute ((__const__))
193	#define ecb_pure ecb_attribute ((__pure__))	317	#define ecb_pure ecb_attribute ((__pure__))
		318
		319	#if ECB_C11
		320	#define ecb_noreturn _Noreturn
		321	#else
		322	#define ecb_noreturn ecb_attribute ((__noreturn__))
		323	#endif
194		324
195	#if ECB_GCC_VERSION(4,3)	325	#if ECB_GCC_VERSION(4,3)
196	#define ecb_artificial ecb_attribute ((__artificial__))	326	#define ecb_artificial ecb_attribute ((__artificial__))
197	#define ecb_hot ecb_attribute ((__hot__))	327	#define ecb_hot ecb_attribute ((__hot__))
198	#define ecb_cold ecb_attribute ((__cold__))	328	#define ecb_cold ecb_attribute ((__cold__))
…		…
289		419
290	return r + ecb_ld32 (x);	420	return r + ecb_ld32 (x);
291	}	421	}
292	#endif	422	#endif
293		423
		424	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
		425	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
		426	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
		427	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
		428
294	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;	429	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
295	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)	430	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
296	{	431	{
297	return ( (x * 0x0802U & 0x22110U)	432	return ( (x * 0x0802U & 0x22110U)
298	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;	433	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
…		…
377		512
378	#if ECB_GCC_VERSION(4,5)	513	#if ECB_GCC_VERSION(4,5)
379	#define ecb_unreachable() __builtin_unreachable ()	514	#define ecb_unreachable() __builtin_unreachable ()
380	#else	515	#else
381	/* this seems to work fine, but gcc always emits a warning for it :/ */	516	/* this seems to work fine, but gcc always emits a warning for it :/ */
382	ecb_function_ void ecb_unreachable (void) ecb_noreturn;	517	ecb_inline void ecb_unreachable (void) ecb_noreturn;
383	ecb_function_ void ecb_unreachable (void) { }	518	ecb_inline void ecb_unreachable (void) { }
384	#endif	519	#endif
385		520
386	/* try to tell the compiler that some condition is definitely true */	521	/* try to tell the compiler that some condition is definitely true */
387	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)	522	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
388		523
389	ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;	524	ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
390	ecb_function_ unsigned char	525	ecb_inline unsigned char
391	ecb_byteorder_helper (void)	526	ecb_byteorder_helper (void)
392	{	527	{
393	const uint32_t u = 0x11223344;	528	/* the union code still generates code under pressure in gcc, */
394	return (unsigned char )&u;	529	/* but less than using pointers, and always seems to */
		530	/* successfully return a constant. */
		531	/* the reason why we have this horrible preprocessor mess */
		532	/* is to avoid it in all cases, at least on common architectures */
		533	/* or when using a recent enough gcc version (>= 4.6) */
		534	#if __i386 \|\| __i386__ \|\| _M_X86 \|\| __amd64 \|\| __amd64__ \|\| _M_X64
		535	return 0x44;
		536	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
		537	return 0x44;
		538	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
		539	return 0x11;
		540	#else
		541	union
		542	{
		543	uint32_t i;
		544	uint8_t c;
		545	} u = { 0x11223344 };
		546	return u.c;
		547	#endif
395	}	548	}
396		549
397	ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;	550	ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
398	ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }	551	ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
399	ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;	552	ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
400	ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }	553	ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
401		554
402	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99	555	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
403	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))	556	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
404	#else	557	#else
405	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))	558	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
…		…
430	}	583	}
431	#else	584	#else
432	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	585	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
433	#endif	586	#endif
434		587
		588	/*******************************************************************************/
		589	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
		590
		591	/* basically, everything uses "ieee pure-endian" floating point numbers */
		592	/* the only noteworthy exception is ancient armle, which uses order 43218765 */
		593	#if 0 \
		594	\|\| __i386 \|\| __i386__ \
		595	\|\| __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__ \
		596	\|\| __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__ \
		597	\|\| defined __arm__ && defined __ARM_EABI__ \
		598	\|\| defined __s390__ \|\| defined __s390x__ \
		599	\|\| defined __mips__ \
		600	\|\| defined __alpha__ \
		601	\|\| defined __hppa__ \
		602	\|\| defined __ia64__ \
		603	\|\| defined __m68k__ \
		604	\|\| defined __m88k__ \
		605	\|\| defined __sh__ \
		606	\|\| defined _M_IX86 \|\| defined _M_AMD64 \|\| defined _M_IA64
		607	#define ECB_STDFP 1
		608	#include <string.h> /* for memcpy */
		609	#else
		610	#define ECB_STDFP 0
		611	#endif
		612
		613	#ifndef ECB_NO_LIBM
		614
		615	#include <math.h> /* for frexp, ldexp, INFINITY, NAN */
		616
		617	/* only the oldest of old doesn't have this one. solaris. */
		618	#ifdef INFINITY
		619	#define ECB_INFINITY INFINITY
		620	#else
		621	#define ECB_INFINITY HUGE_VAL
435	#endif	622	#endif
436		623
		624	#ifdef NAN
		625	#define ECB_NAN NAN
		626	#else
		627	#define ECB_NAN ECB_INFINITY
		628	#endif
		629
		630	/* converts an ieee half/binary16 to a float */
		631	ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
		632	ecb_function_ float
		633	ecb_binary16_to_float (uint16_t x)
		634	{
		635	int e = (x >> 10) & 0x1f;
		636	int m = x & 0x3ff;
		637	float r;
		638
		639	if (!e ) r = ldexpf (m , -24);
		640	else if (e != 31) r = ldexpf (m + 0x400, e - 25);
		641	else if (m ) r = ECB_NAN;
		642	else r = ECB_INFINITY;
		643
		644	return x & 0x8000 ? -r : r;
		645	}
		646
		647	/* convert a float to ieee single/binary32 */
		648	ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
		649	ecb_function_ uint32_t
		650	ecb_float_to_binary32 (float x)
		651	{
		652	uint32_t r;
		653
		654	#if ECB_STDFP
		655	memcpy (&r, &x, 4);
		656	#else
		657	/* slow emulation, works for anything but -0 */
		658	uint32_t m;
		659	int e;
		660
		661	if (x == 0e0f ) return 0x00000000U;
		662	if (x > +3.40282346638528860e+38f) return 0x7f800000U;
		663	if (x < -3.40282346638528860e+38f) return 0xff800000U;
		664	if (x != x ) return 0x7fbfffffU;
		665
		666	m = frexpf (x, &e) * 0x1000000U;
		667
		668	r = m & 0x80000000U;
		669
		670	if (r)
		671	m = -m;
		672
		673	if (e <= -126)
		674	{
		675	m &= 0xffffffU;
		676	m >>= (-125 - e);
		677	e = -126;
		678	}
		679
		680	r \|= (e + 126) << 23;
		681	r \|= m & 0x7fffffU;
		682	#endif
		683
		684	return r;
		685	}
		686
		687	/* converts an ieee single/binary32 to a float */
		688	ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
		689	ecb_function_ float
		690	ecb_binary32_to_float (uint32_t x)
		691	{
		692	float r;
		693
		694	#if ECB_STDFP
		695	memcpy (&r, &x, 4);
		696	#else
		697	/* emulation, only works for normals and subnormals and +0 */
		698	int neg = x >> 31;
		699	int e = (x >> 23) & 0xffU;
		700
		701	x &= 0x7fffffU;
		702
		703	if (e)
		704	x \|= 0x800000U;
		705	else
		706	e = 1;
		707
		708	/* we distrust ldexpf a bit and do the 2*-24 scaling by an extra multiply /
		709	r = ldexpf (x * (0.5f / 0x800000U), e - 126);
		710
		711	r = neg ? -r : r;
		712	#endif
		713
		714	return r;
		715	}
		716
		717	/* convert a double to ieee double/binary64 */
		718	ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
		719	ecb_function_ uint64_t
		720	ecb_double_to_binary64 (double x)
		721	{
		722	uint64_t r;
		723
		724	#if ECB_STDFP
		725	memcpy (&r, &x, 8);
		726	#else
		727	/* slow emulation, works for anything but -0 */
		728	uint64_t m;
		729	int e;
		730
		731	if (x == 0e0 ) return 0x0000000000000000U;
		732	if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
		733	if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
		734	if (x != x ) return 0X7ff7ffffffffffffU;
		735
		736	m = frexp (x, &e) * 0x20000000000000U;
		737
		738	r = m & 0x8000000000000000;;
		739
		740	if (r)
		741	m = -m;
		742
		743	if (e <= -1022)
		744	{
		745	m &= 0x1fffffffffffffU;
		746	m >>= (-1021 - e);
		747	e = -1022;
		748	}
		749
		750	r \|= ((uint64_t)(e + 1022)) << 52;
		751	r \|= m & 0xfffffffffffffU;
		752	#endif
		753
		754	return r;
		755	}
		756
		757	/* converts an ieee double/binary64 to a double */
		758	ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
		759	ecb_function_ double
		760	ecb_binary64_to_double (uint64_t x)
		761	{
		762	double r;
		763
		764	#if ECB_STDFP
		765	memcpy (&r, &x, 8);
		766	#else
		767	/* emulation, only works for normals and subnormals and +0 */
		768	int neg = x >> 63;
		769	int e = (x >> 52) & 0x7ffU;
		770
		771	x &= 0xfffffffffffffU;
		772
		773	if (e)
		774	x \|= 0x10000000000000U;
		775	else
		776	e = 1;
		777
		778	/* we distrust ldexp a bit and do the 2*-53 scaling by an extra multiply /
		779	r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
		780
		781	r = neg ? -r : r;
		782	#endif
		783
		784	return r;
		785	}
		786
		787	#endif
		788
		789	#endif
		790

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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 1.128 by root, Thu Jan 9 05:16:12 2014 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 1.128 by root, Thu Jan 9 05:16:12 2014 UTC