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

Comparing libeio/ecb.h (file contents):
Revision 1.13 by root, Sat Jun 2 20:13:26 2012 UTC vs.
Revision 1.27 by root, Mon Jan 18 11:53:09 2016 UTC

…		…
1	/*	1	/*
2	* libecb - http://software.schmorp.de/pkg/libecb	2	* libecb - http://software.schmorp.de/pkg/libecb
3	*	3	*
4	* Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>	4	* Copyright (©) 2009-2015 Marc Alexander Lehmann <libecb@schmorp.de>
5	* Copyright (©) 2011 Emanuele Giaquinta	5	* Copyright (©) 2011 Emanuele Giaquinta
6	* All rights reserved.	6	* All rights reserved.
7	*	7	*
8	* Redistribution and use in source and binary forms, with or without modifica-	8	* Redistribution and use in source and binary forms, with or without modifica-
9	* tion, are permitted provided that the following conditions are met:	9	* tion, are permitted provided that the following conditions are met:
23	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;	23	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24	* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,	24	* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-	25	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
26	* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED	26	* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27	* OF THE POSSIBILITY OF SUCH DAMAGE.	27	* OF THE POSSIBILITY OF SUCH DAMAGE.
		28	*
		29	* Alternatively, the contents of this file may be used under the terms of
		30	* the GNU General Public License ("GPL") version 2 or any later version,
		31	* in which case the provisions of the GPL are applicable instead of
		32	* the above. If you wish to allow the use of your version of this file
		33	* only under the terms of the GPL and not to allow others to use your
		34	* version of this file under the BSD license, indicate your decision
		35	* by deleting the provisions above and replace them with the notice
		36	* and other provisions required by the GPL. If you do not delete the
		37	* provisions above, a recipient may use your version of this file under
		38	* either the BSD or the GPL.
28	*/	39	*/
29		40
30	#ifndef ECB_H	41	#ifndef ECB_H
31	#define ECB_H	42	#define ECB_H
32		43
33	/* 16 bits major, 16 bits minor */	44	/* 16 bits major, 16 bits minor */
34	#define ECB_VERSION 0x00010001	45	#define ECB_VERSION 0x00010005
35		46
36	#ifdef _WIN32	47	#ifdef _WIN32
37	typedef signed char int8_t;	48	typedef signed char int8_t;
38	typedef unsigned char uint8_t;	49	typedef unsigned char uint8_t;
39	typedef signed short int16_t;	50	typedef signed short int16_t;
…		…
54	#else	65	#else
55	#define ECB_PTRSIZE 4	66	#define ECB_PTRSIZE 4
56	typedef uint32_t uintptr_t;	67	typedef uint32_t uintptr_t;
57	typedef int32_t intptr_t;	68	typedef int32_t intptr_t;
58	#endif	69	#endif
59	typedef intptr_t ptrdiff_t;
60	#else	70	#else
61	#include <inttypes.h>	71	#include <inttypes.h>
62	#if UINTMAX_MAX > 0xffffffffU	72	#if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
63	#define ECB_PTRSIZE 8	73	#define ECB_PTRSIZE 8
64	#else	74	#else
65	#define ECB_PTRSIZE 4	75	#define ECB_PTRSIZE 4
		76	#endif
		77	#endif
		78
		79	#define ECB_GCC_AMD64 (__amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__)
		80	#define ECB_MSVC_AMD64 (_M_AMD64 \|\| _M_X64)
		81
		82	/* work around x32 idiocy by defining proper macros */
		83	#if ECB_GCC_AMD64 \|\| ECB_MSVC_AMD64
		84	#if _ILP32
		85	#define ECB_AMD64_X32 1
		86	#else
		87	#define ECB_AMD64 1
66	#endif	88	#endif
67	#endif	89	#endif
68		90
69	/* many compilers define _GNUC_ to some versions but then only implement	91	/* many compilers define _GNUC_ to some versions but then only implement
70	* what their idiot authors think are the "more important" extensions,	92	* what their idiot authors think are the "more important" extensions,
71	* causing enormous grief in return for some better fake benchmark numbers.	93	* causing enormous grief in return for some better fake benchmark numbers.
72	* or so.	94	* or so.
73	* we try to detect these and simply assume they are not gcc - if they have	95	* we try to detect these and simply assume they are not gcc - if they have
74	* an issue with that they should have done it right in the first place.	96	* an issue with that they should have done it right in the first place.
75	*/	97	*/
76	#ifndef ECB_GCC_VERSION
77	#if !defined __GNUC_MINOR__ \|\| defined __INTEL_COMPILER \|\| defined __SUNPRO_C \|\| defined __SUNPRO_CC \|\| defined __llvm__ \|\| defined __clang__	98	#if !defined __GNUC_MINOR__ \|\| defined __INTEL_COMPILER \|\| defined __SUNPRO_C \|\| defined __SUNPRO_CC \|\| defined __llvm__ \|\| defined __clang__
78	#define ECB_GCC_VERSION(major,minor) 0	99	#define ECB_GCC_VERSION(major,minor) 0
79	#else	100	#else
80	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))	101	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
81	#endif	102	#endif
82	#endif
83		103
84	#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */	104	#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) \|\| (__clang_major__ == (major) && __clang_minor__ >= (minor)))
85	#define ECB_C99 (__STDC_VERSION__ >= 199901L)	105
86	#define ECB_C11 (__STDC_VERSION__ >= 201112L)	106	#if __clang__ && defined __has_builtin
		107	#define ECB_CLANG_BUILTIN(x) __has_builtin (x)
		108	#else
		109	#define ECB_CLANG_BUILTIN(x) 0
		110	#endif
		111
		112	#if __clang__ && defined __has_extension
		113	#define ECB_CLANG_EXTENSION(x) __has_extension (x)
		114	#else
		115	#define ECB_CLANG_EXTENSION(x) 0
		116	#endif
		117
87	#define ECB_CPP (__cplusplus+0)	118	#define ECB_CPP (__cplusplus+0)
88	#define ECB_CPP11 (__cplusplus >= 201103L)	119	#define ECB_CPP11 (__cplusplus >= 201103L)
89		120
		121	#if ECB_CPP
		122	#define ECB_C 0
		123	#define ECB_STDC_VERSION 0
		124	#else
		125	#define ECB_C 1
		126	#define ECB_STDC_VERSION __STDC_VERSION__
		127	#endif
		128
		129	#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
		130	#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
		131
		132	#if ECB_CPP
		133	#define ECB_EXTERN_C extern "C"
		134	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {
		135	#define ECB_EXTERN_C_END }
		136	#else
		137	#define ECB_EXTERN_C extern
		138	#define ECB_EXTERN_C_BEG
		139	#define ECB_EXTERN_C_END
		140	#endif
		141
90	/*****************************************************************************/	142	/*****************************************************************************/
91		143
92	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */	144	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
93	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */	145	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
94		146
…		…
96	#define ECB_NO_SMP 1	148	#define ECB_NO_SMP 1
97	#endif	149	#endif
98		150
99	#if ECB_NO_SMP	151	#if ECB_NO_SMP
100	#define ECB_MEMORY_FENCE do { } while (0)	152	#define ECB_MEMORY_FENCE do { } while (0)
		153	#endif
		154
		155	/* 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
		157	#include <builtins.h>
		158	#endif
		159
		160	#if 1400 <= _MSC_VER
		161	#include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
101	#endif	162	#endif
102		163
103	#ifndef ECB_MEMORY_FENCE	164	#ifndef ECB_MEMORY_FENCE
104	#if ECB_GCC_VERSION(2,5) \|\| defined __INTEL_COMPILER \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110	165	#if ECB_GCC_VERSION(2,5) \|\| defined __INTEL_COMPILER \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
105	#if __i386 \|\| __i386__	166	#if __i386 \|\| __i386__
106	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")	167	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
107	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")	168	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
108	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")	169	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
109	#elif __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__	170	#elif ECB_GCC_AMD64
110	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")	171	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
111	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")	172	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
112	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")	173	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
113	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__	174	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__
114	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")	175	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		176	#elif defined __ARM_ARCH_2__ \
		177	\|\| defined __ARM_ARCH_3__ \|\| defined __ARM_ARCH_3M__ \
		178	\|\| defined __ARM_ARCH_4__ \|\| defined __ARM_ARCH_4T__ \
		179	\|\| defined __ARM_ARCH_5__ \|\| defined __ARM_ARCH_5E__ \
		180	\|\| defined __ARM_ARCH_5T__ \|\| defined __ARM_ARCH_5TE__ \
		181	\|\| defined __ARM_ARCH_5TEJ__
		182	/* should not need any, unless running old code on newer cpu - arm doesn't support that */
115	#elif defined __ARM_ARCH_6__ \|\| defined __ARM_ARCH_6J__ \	183	#elif defined __ARM_ARCH_6__ \|\| defined __ARM_ARCH_6J__ \
116	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__	184	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__ \
		185	\|\| defined __ARM_ARCH_6T2__
117	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")	186	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
118	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \	187	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \
119	\|\| defined __ARM_ARCH_7M__ \|\| defined __ARM_ARCH_7R__	188	\|\| defined __ARM_ARCH_7R__ \|\| defined __ARM_ARCH_7M__
120	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")	189	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
121	#elif __sparc \|\| __sparc__	190	#elif __aarch64__
		191	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
		192	#elif (__sparc \|\| __sparc__) && !(__sparc_v8__ \|\| defined __sparcv8)
122	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad" : : : "memory")	193	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad" : : : "memory")
123	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")	194	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
124	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")	195	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
125	#elif defined __s390__ \|\| defined __s390x__	196	#elif defined __s390__ \|\| defined __s390x__
126	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")	197	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
127	#elif defined __mips__	198	#elif defined __mips__
		199	/* GNU/Linux emulates sync on mips1 architectures, so we force its use */
		200	/* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
128	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")	201	#define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
129	#elif defined __alpha__	202	#elif defined __alpha__
130	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")	203	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
131	#elif defined __hppa__	204	#elif defined __hppa__
132	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")	205	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
133	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")	206	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
134	#elif defined __ia64__	207	#elif defined __ia64__
135	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")	208	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
		209	#elif defined __m68k__
		210	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		211	#elif defined __m88k__
		212	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
		213	#elif defined __sh__
		214	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
136	#endif	215	#endif
137	#endif	216	#endif
138	#endif	217	#endif
139		218
140	#ifndef ECB_MEMORY_FENCE	219	#ifndef ECB_MEMORY_FENCE
141	#if ECB_GCC_VERSION(4,7)	220	#if ECB_GCC_VERSION(4,7)
142	/* see comment below (stdatomic.h) about the C11 memory model. */	221	/* see comment below (stdatomic.h) about the C11 memory model. */
143	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)	222	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
144	#elif defined __clang && __has_feature (cxx_atomic)	223	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
		224	#define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
		225
		226	#elif ECB_CLANG_EXTENSION(c_atomic)
145	/* see comment below (stdatomic.h) about the C11 memory model. */	227	/* see comment below (stdatomic.h) about the C11 memory model. */
146	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)	228	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
		229	#define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
		230	#define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
		231
147	#elif ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__	232	#elif ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__
148	#define ECB_MEMORY_FENCE __sync_synchronize ()	233	#define ECB_MEMORY_FENCE __sync_synchronize ()
		234	#elif _MSC_VER >= 1500 /* VC++ 2008 */
		235	/* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
		236	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		237	#define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
		238	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
		239	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
149	#elif _MSC_VER >= 1400 /* VC++ 2005 */	240	#elif _MSC_VER >= 1400 /* VC++ 2005 */
150	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)	241	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
151	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()	242	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
152	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */	243	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
153	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()	244	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
…		…
173	/* any fence other than seq_cst, which isn't very efficient for us. */	264	/* any fence other than seq_cst, which isn't very efficient for us. */
174	/* Why that is, we don't know - either the C11 memory model is quite useless */	265	/* Why that is, we don't know - either the C11 memory model is quite useless */
175	/* for most usages, or gcc and clang have a bug */	266	/* for most usages, or gcc and clang have a bug */
176	/* I currently lean towards the latter, and inefficiently implement */	267	/* I currently lean towards the latter, and inefficiently implement */
177	/* all three of ecb's fences as a seq_cst fence */	268	/* all three of ecb's fences as a seq_cst fence */
		269	/* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
		270	/* for all __atomic_thread_fence's except seq_cst */
178	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)	271	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
179	#endif	272	#endif
180	#endif	273	#endif
181		274
182	#ifndef ECB_MEMORY_FENCE	275	#ifndef ECB_MEMORY_FENCE
…		…
205	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE	298	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
206	#endif	299	#endif
207		300
208	/*****************************************************************************/	301	/*****************************************************************************/
209		302
210	#if __cplusplus	303	#if ECB_CPP
211	#define ecb_inline static inline	304	#define ecb_inline static inline
212	#elif ECB_GCC_VERSION(2,5)	305	#elif ECB_GCC_VERSION(2,5)
213	#define ecb_inline static __inline__	306	#define ecb_inline static __inline__
214	#elif ECB_C99	307	#elif ECB_C99
215	#define ecb_inline static inline	308	#define ecb_inline static inline
…		…
229		322
230	#define ECB_CONCAT_(a, b) a ## b	323	#define ECB_CONCAT_(a, b) a ## b
231	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	324	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
232	#define ECB_STRINGIFY_(a) # a	325	#define ECB_STRINGIFY_(a) # a
233	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)	326	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
		327	#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
234		328
235	#define ecb_function_ ecb_inline	329	#define ecb_function_ ecb_inline
236		330
237	#if ECB_GCC_VERSION(3,1)	331	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_VERSION(2,8)
238	#define ecb_attribute(attrlist) __attribute__(attrlist)	332	#define ecb_attribute(attrlist) __attribute__ (attrlist)
		333	#else
		334	#define ecb_attribute(attrlist)
		335	#endif
		336
		337	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_constant_p)
239	#define ecb_is_constant(expr) __builtin_constant_p (expr)	338	#define ecb_is_constant(expr) __builtin_constant_p (expr)
		339	#else
		340	/* possible C11 impl for integral types
		341	typedef struct ecb_is_constant_struct ecb_is_constant_struct;
		342	#define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct )0 : (void )((expr) - (expr)), ecb_is_constant_struct : 0, default: 1)) /
		343
		344	#define ecb_is_constant(expr) 0
		345	#endif
		346
		347	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_expect)
240	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))	348	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
		349	#else
		350	#define ecb_expect(expr,value) (expr)
		351	#endif
		352
		353	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_prefetch)
241	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)	354	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
242	#else	355	#else
243	#define ecb_attribute(attrlist)
244	#define ecb_is_constant(expr) 0
245	#define ecb_expect(expr,value) (expr)
246	#define ecb_prefetch(addr,rw,locality)	356	#define ecb_prefetch(addr,rw,locality)
247	#endif	357	#endif
248		358
249	/* no emulation for ecb_decltype */	359	/* no emulation for ecb_decltype */
250	#if ECB_GCC_VERSION(4,5)	360	#if ECB_CPP11
		361	// older implementations might have problems with decltype(x)::type, work around it
		362	template<class T> struct ecb_decltype_t { typedef T type; };
251	#define ecb_decltype(x) __decltype(x)	363	#define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
252	#elif ECB_GCC_VERSION(3,0)	364	#elif ECB_GCC_VERSION(3,0) \|\| ECB_CLANG_VERSION(2,8)
253	#define ecb_decltype(x) __typeof(x)	365	#define ecb_decltype(x) __typeof__ (x)
254	#endif	366	#endif
255		367
		368	#if _MSC_VER >= 1300
		369	#define ecb_deprecated __declspec (deprecated)
		370	#else
		371	#define ecb_deprecated ecb_attribute ((__deprecated__))
		372	#endif
		373
		374	#if _MSC_VER >= 1500
		375	#define ecb_deprecated_message(msg) __declspec (deprecated (msg))
		376	#elif ECB_GCC_VERSION(4,5)
		377	#define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
		378	#else
		379	#define ecb_deprecated_message(msg) ecb_deprecated
		380	#endif
		381
		382	#if _MSC_VER >= 1400
		383	#define ecb_noinline __declspec (noinline)
		384	#else
256	#define ecb_noinline ecb_attribute ((__noinline__))	385	#define ecb_noinline ecb_attribute ((__noinline__))
		386	#endif
		387
257	#define ecb_unused ecb_attribute ((__unused__))	388	#define ecb_unused ecb_attribute ((__unused__))
258	#define ecb_const ecb_attribute ((__const__))	389	#define ecb_const ecb_attribute ((__const__))
259	#define ecb_pure ecb_attribute ((__pure__))	390	#define ecb_pure ecb_attribute ((__pure__))
260		391
261	#if ECB_C11	392	#if ECB_C11 \|\| __IBMC_NORETURN
		393	/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
262	#define ecb_noreturn _Noreturn	394	#define ecb_noreturn _Noreturn
		395	#elif ECB_CPP11
		396	#define ecb_noreturn [[noreturn]]
		397	#elif _MSC_VER >= 1200
		398	/* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
		399	#define ecb_noreturn __declspec (noreturn)
263	#else	400	#else
264	#define ecb_noreturn ecb_attribute ((__noreturn__))	401	#define ecb_noreturn ecb_attribute ((__noreturn__))
265	#endif	402	#endif
266		403
267	#if ECB_GCC_VERSION(4,3)	404	#if ECB_GCC_VERSION(4,3)
…		…
282	/* for compatibility to the rest of the world */	419	/* for compatibility to the rest of the world */
283	#define ecb_likely(expr) ecb_expect_true (expr)	420	#define ecb_likely(expr) ecb_expect_true (expr)
284	#define ecb_unlikely(expr) ecb_expect_false (expr)	421	#define ecb_unlikely(expr) ecb_expect_false (expr)
285		422
286	/* count trailing zero bits and count # of one bits */	423	/* count trailing zero bits and count # of one bits */
287	#if ECB_GCC_VERSION(3,4)	424	#if ECB_GCC_VERSION(3,4) \
		425	\|\| (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
		426	&& ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
		427	&& ECB_CLANG_BUILTIN(__builtin_popcount))
288	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */	428	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
289	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)	429	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
290	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)	430	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
291	#define ecb_ctz32(x) __builtin_ctz (x)	431	#define ecb_ctz32(x) __builtin_ctz (x)
292	#define ecb_ctz64(x) __builtin_ctzll (x)	432	#define ecb_ctz64(x) __builtin_ctzll (x)
293	#define ecb_popcount32(x) __builtin_popcount (x)	433	#define ecb_popcount32(x) __builtin_popcount (x)
294	/* no popcountll */	434	/* no popcountll */
295	#else	435	#else
296	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;	436	ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
297	ecb_function_ int	437	ecb_function_ ecb_const int
298	ecb_ctz32 (uint32_t x)	438	ecb_ctz32 (uint32_t x)
299	{	439	{
		440	#if 1400 <= _MSC_VER && (_M_IX86 \|\| _M_X64 \|\| _M_IA64 \|\| _M_ARM)
		441	unsigned long r;
		442	_BitScanForward (&r, x);
		443	return (int)r;
		444	#else
300	int r = 0;	445	int r = 0;
301		446
302	x &= ~x + 1; /* this isolates the lowest bit */	447	x &= ~x + 1; /* this isolates the lowest bit */
303		448
304	#if ECB_branchless_on_i386	449	#if ECB_branchless_on_i386
…		…
314	if (x & 0xff00ff00) r += 8;	459	if (x & 0xff00ff00) r += 8;
315	if (x & 0xffff0000) r += 16;	460	if (x & 0xffff0000) r += 16;
316	#endif	461	#endif
317		462
318	return r;	463	return r;
		464	#endif
319	}	465	}
320		466
321	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;	467	ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
322	ecb_function_ int	468	ecb_function_ ecb_const int
323	ecb_ctz64 (uint64_t x)	469	ecb_ctz64 (uint64_t x)
324	{	470	{
		471	#if 1400 <= _MSC_VER && (_M_X64 \|\| _M_IA64 \|\| _M_ARM)
		472	unsigned long r;
		473	_BitScanForward64 (&r, x);
		474	return (int)r;
		475	#else
325	int shift = x & 0xffffffffU ? 0 : 32;	476	int shift = x & 0xffffffff ? 0 : 32;
326	return ecb_ctz32 (x >> shift) + shift;	477	return ecb_ctz32 (x >> shift) + shift;
		478	#endif
327	}	479	}
328		480
329	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;	481	ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
330	ecb_function_ int	482	ecb_function_ ecb_const int
331	ecb_popcount32 (uint32_t x)	483	ecb_popcount32 (uint32_t x)
332	{	484	{
333	x -= (x >> 1) & 0x55555555;	485	x -= (x >> 1) & 0x55555555;
334	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);	486	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
335	x = ((x >> 4) + x) & 0x0f0f0f0f;	487	x = ((x >> 4) + x) & 0x0f0f0f0f;
336	x *= 0x01010101;	488	x *= 0x01010101;
337		489
338	return x >> 24;	490	return x >> 24;
339	}	491	}
340		492
341	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;	493	ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
342	ecb_function_ int ecb_ld32 (uint32_t x)	494	ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
343	{	495	{
		496	#if 1400 <= _MSC_VER && (_M_IX86 \|\| _M_X64 \|\| _M_IA64 \|\| _M_ARM)
		497	unsigned long r;
		498	_BitScanReverse (&r, x);
		499	return (int)r;
		500	#else
344	int r = 0;	501	int r = 0;
345		502
346	if (x >> 16) { x >>= 16; r += 16; }	503	if (x >> 16) { x >>= 16; r += 16; }
347	if (x >> 8) { x >>= 8; r += 8; }	504	if (x >> 8) { x >>= 8; r += 8; }
348	if (x >> 4) { x >>= 4; r += 4; }	505	if (x >> 4) { x >>= 4; r += 4; }
349	if (x >> 2) { x >>= 2; r += 2; }	506	if (x >> 2) { x >>= 2; r += 2; }
350	if (x >> 1) { r += 1; }	507	if (x >> 1) { r += 1; }
351		508
352	return r;	509	return r;
		510	#endif
353	}	511	}
354		512
355	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;	513	ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
356	ecb_function_ int ecb_ld64 (uint64_t x)	514	ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
357	{	515	{
		516	#if 1400 <= _MSC_VER && (_M_X64 \|\| _M_IA64 \|\| _M_ARM)
		517	unsigned long r;
		518	_BitScanReverse64 (&r, x);
		519	return (int)r;
		520	#else
358	int r = 0;	521	int r = 0;
359		522
360	if (x >> 32) { x >>= 32; r += 32; }	523	if (x >> 32) { x >>= 32; r += 32; }
361		524
362	return r + ecb_ld32 (x);	525	return r + ecb_ld32 (x);
363	}
364	#endif	526	#endif
		527	}
		528	#endif
365		529
366	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;	530	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
367	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }	531	ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
368	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;	532	ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
369	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }	533	ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
370		534
371	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;	535	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
372	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)	536	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
373	{	537	{
374	return ( (x * 0x0802U & 0x22110U)	538	return ( (x * 0x0802U & 0x22110U)
375	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;	539	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
376	}	540	}
377		541
378	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;	542	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
379	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)	543	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
380	{	544	{
381	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);	545	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);
382	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);	546	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);
383	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);	547	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);
384	x = ( x >> 8 ) \| ( x << 8);	548	x = ( x >> 8 ) \| ( x << 8);
385		549
386	return x;	550	return x;
387	}	551	}
388		552
389	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;	553	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
390	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)	554	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
391	{	555	{
392	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);	556	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);
393	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);	557	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);
394	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);	558	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);
395	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);	559	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);
…		…
398	return x;	562	return x;
399	}	563	}
400		564
401	/* popcount64 is only available on 64 bit cpus as gcc builtin */	565	/* popcount64 is only available on 64 bit cpus as gcc builtin */
402	/* so for this version we are lazy */	566	/* so for this version we are lazy */
403	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;	567	ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
404	ecb_function_ int	568	ecb_function_ ecb_const int
405	ecb_popcount64 (uint64_t x)	569	ecb_popcount64 (uint64_t x)
406	{	570	{
407	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);	571	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
408	}	572	}
409		573
410	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;	574	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
411	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;	575	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
412	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;	576	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
413	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;	577	ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
414	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;	578	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
415	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;	579	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
416	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;	580	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
417	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;	581	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
418		582
419	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }	583	ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }
420	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }	584	ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }
421	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }	585	ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }
422	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }	586	ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }
423	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }	587	ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }
424	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }	588	ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }
425	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }	589	ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }
426	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }	590	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }
427		591
428	#if ECB_GCC_VERSION(4,3)	592	#if ECB_GCC_VERSION(4,3) \|\| (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
		593	#if ECB_GCC_VERSION(4,8) \|\| ECB_CLANG_BUILTIN(__builtin_bswap16)
		594	#define ecb_bswap16(x) __builtin_bswap16 (x)
		595	#else
429	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)	596	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
		597	#endif
430	#define ecb_bswap32(x) __builtin_bswap32 (x)	598	#define ecb_bswap32(x) __builtin_bswap32 (x)
431	#define ecb_bswap64(x) __builtin_bswap64 (x)	599	#define ecb_bswap64(x) __builtin_bswap64 (x)
		600	#elif _MSC_VER
		601	#include <stdlib.h>
		602	#define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
		603	#define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
		604	#define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
432	#else	605	#else
433	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;	606	ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
434	ecb_function_ uint16_t	607	ecb_function_ ecb_const uint16_t
435	ecb_bswap16 (uint16_t x)	608	ecb_bswap16 (uint16_t x)
436	{	609	{
437	return ecb_rotl16 (x, 8);	610	return ecb_rotl16 (x, 8);
438	}	611	}
439		612
440	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;	613	ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
441	ecb_function_ uint32_t	614	ecb_function_ ecb_const uint32_t
442	ecb_bswap32 (uint32_t x)	615	ecb_bswap32 (uint32_t x)
443	{	616	{
444	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);	617	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);
445	}	618	}
446		619
447	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;	620	ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
448	ecb_function_ uint64_t	621	ecb_function_ ecb_const uint64_t
449	ecb_bswap64 (uint64_t x)	622	ecb_bswap64 (uint64_t x)
450	{	623	{
451	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);	624	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);
452	}	625	}
453	#endif	626	#endif
454		627
455	#if ECB_GCC_VERSION(4,5)	628	#if ECB_GCC_VERSION(4,5) \|\| ECB_CLANG_BUILTIN(__builtin_unreachable)
456	#define ecb_unreachable() __builtin_unreachable ()	629	#define ecb_unreachable() __builtin_unreachable ()
457	#else	630	#else
458	/* this seems to work fine, but gcc always emits a warning for it :/ */	631	/* this seems to work fine, but gcc always emits a warning for it :/ */
459	ecb_inline void ecb_unreachable (void) ecb_noreturn;	632	ecb_inline ecb_noreturn void ecb_unreachable (void);
460	ecb_inline void ecb_unreachable (void) { }	633	ecb_inline ecb_noreturn void ecb_unreachable (void) { }
461	#endif	634	#endif
462		635
463	/* try to tell the compiler that some condition is definitely true */	636	/* try to tell the compiler that some condition is definitely true */
464	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)	637	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
465		638
466	ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;	639	ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
467	ecb_inline unsigned char	640	ecb_inline ecb_const uint32_t
468	ecb_byteorder_helper (void)	641	ecb_byteorder_helper (void)
469	{	642	{
470	const uint32_t u = 0x11223344;	643	/* the union code still generates code under pressure in gcc, */
471	return (unsigned char )&u;	644	/* but less than using pointers, and always seems to */
		645	/* successfully return a constant. */
		646	/* the reason why we have this horrible preprocessor mess */
		647	/* is to avoid it in all cases, at least on common architectures */
		648	/* or when using a recent enough gcc version (>= 4.6) */
		649	#if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
		650	\|\| ((__i386 \|\| __i386__ \|\| _M_IX86 \|\| ECB_GCC_AMD64 \|\| ECB_MSVC_AMD64) && !__VOS__)
		651	#define ECB_LITTLE_ENDIAN 1
		652	return 0x44332211;
		653	#elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
		654	\|\| ((__AARCH64EB__ \|\| __MIPSEB__ \|\| __ARMEB__) && !__VOS__)
		655	#define ECB_BIG_ENDIAN 1
		656	return 0x11223344;
		657	#else
		658	union
		659	{
		660	uint8_t c[4];
		661	uint32_t u;
		662	} u = { 0x11, 0x22, 0x33, 0x44 };
		663	return u.u;
		664	#endif
472	}	665	}
473		666
474	ecb_inline ecb_bool ecb_big_endian (void) ecb_const;	667	ecb_inline ecb_const ecb_bool ecb_big_endian (void);
475	ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }	668	ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
476	ecb_inline ecb_bool ecb_little_endian (void) ecb_const;	669	ecb_inline ecb_const ecb_bool ecb_little_endian (void);
477	ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }	670	ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
478		671
479	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99	672	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
480	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))	673	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
481	#else	674	#else
482	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))	675	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
483	#endif	676	#endif
484		677
485	#if __cplusplus	678	#if ECB_CPP
486	template<typename T>	679	template<typename T>
487	static inline T ecb_div_rd (T val, T div)	680	static inline T ecb_div_rd (T val, T div)
488	{	681	{
489	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;	682	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
490	}	683	}
…		…
507	}	700	}
508	#else	701	#else
509	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	702	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
510	#endif	703	#endif
511		704
		705	ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
		706	ecb_function_ ecb_const uint32_t
		707	ecb_binary16_to_binary32 (uint32_t x)
		708	{
		709	unsigned int s = (x & 0x8000) << (31 - 15);
		710	int e = (x >> 10) & 0x001f;
		711	unsigned int m = x & 0x03ff;
		712
		713	if (ecb_expect_false (e == 31))
		714	/* infinity or NaN */
		715	e = 255 - (127 - 15);
		716	else if (ecb_expect_false (!e))
		717	{
		718	if (ecb_expect_true (!m))
		719	/* zero, handled by code below by forcing e to 0 */
		720	e = 0 - (127 - 15);
		721	else
		722	{
		723	/* subnormal, renormalise */
		724	unsigned int s = 10 - ecb_ld32 (m);
		725
		726	m = (m << s) & 0x3ff; /* mask implicit bit */
		727	e -= s - 1;
		728	}
		729	}
		730
		731	/* e and m now are normalised, or zero, (or inf or nan) */
		732	e += 127 - 15;
		733
		734	return s \| (e << 23) \| (m << (23 - 10));
		735	}
		736
		737	ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
		738	ecb_function_ ecb_const uint16_t
		739	ecb_binary32_to_binary16 (uint32_t x)
		740	{
		741	unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
		742	unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
		743	unsigned int m = x & 0x007fffff;
		744
		745	x &= 0x7fffffff;
		746
		747	/* if it's within range of binary16 normals, use fast path */
		748	if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
		749	{
		750	/* mantissa round-to-even */
		751	m += 0x00000fff + ((m >> (23 - 10)) & 1);
		752
		753	/* handle overflow */
		754	if (ecb_expect_false (m >= 0x00800000))
		755	{
		756	m >>= 1;
		757	e += 1;
		758	}
		759
		760	return s \| (e << 10) \| (m >> (23 - 10));
		761	}
		762
		763	/* handle large numbers and infinity */
		764	if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
		765	return s \| 0x7c00;
		766
		767	/* handle zero, subnormals and small numbers */
		768	if (ecb_expect_true (x < 0x38800000))
		769	{
		770	/* zero */
		771	if (ecb_expect_true (!x))
		772	return s;
		773
		774	/* handle subnormals */
		775
		776	/* too small, will be zero */
		777	if (e < (14 - 24)) /* might not be sharp, but is good enough */
		778	return s;
		779
		780	m \|= 0x00800000; /* make implicit bit explicit */
		781
		782	/* very tricky - we need to round to the nearest e (+10) bit value */
		783	{
		784	unsigned int bits = 14 - e;
		785	unsigned int half = (1 << (bits - 1)) - 1;
		786	unsigned int even = (m >> bits) & 1;
		787
		788	/* if this overflows, we will end up with a normalised number */
		789	m = (m + half + even) >> bits;
		790	}
		791
		792	return s \| m;
		793	}
		794
		795	/* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
		796	m >>= 13;
		797
		798	return s \| 0x7c00 \| m \| !m;
		799	}
		800
		801	/*******************************************************************************/
		802	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
		803
		804	/* basically, everything uses "ieee pure-endian" floating point numbers */
		805	/* the only noteworthy exception is ancient armle, which uses order 43218765 */
		806	#if 0 \
		807	\|\| __i386 \|\| __i386__ \
		808	\|\| ECB_GCC_AMD64 \
		809	\|\| __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__ \
		810	\|\| defined __s390__ \|\| defined __s390x__ \
		811	\|\| defined __mips__ \
		812	\|\| defined __alpha__ \
		813	\|\| defined __hppa__ \
		814	\|\| defined __ia64__ \
		815	\|\| defined __m68k__ \
		816	\|\| defined __m88k__ \
		817	\|\| defined __sh__ \
		818	\|\| defined _M_IX86 \|\| defined ECB_MSVC_AMD64 \|\| defined _M_IA64 \
		819	\|\| (defined __arm__ && (defined __ARM_EABI__ \|\| defined __EABI__ \|\| defined __VFP_FP__ \|\| defined _WIN32_WCE \|\| defined __ANDROID__)) \
		820	\|\| defined __aarch64__
		821	#define ECB_STDFP 1
		822	#include <string.h> /* for memcpy */
		823	#else
		824	#define ECB_STDFP 0
		825	#endif
		826
		827	#ifndef ECB_NO_LIBM
		828
		829	#include <math.h> /* for frexp, ldexp, INFINITY, NAN */
		830
		831	/* only the oldest of old doesn't have this one. solaris. */
		832	#ifdef INFINITY
		833	#define ECB_INFINITY INFINITY
		834	#else
		835	#define ECB_INFINITY HUGE_VAL
512	#endif	836	#endif
513		837
		838	#ifdef NAN
		839	#define ECB_NAN NAN
		840	#else
		841	#define ECB_NAN ECB_INFINITY
		842	#endif
		843
		844	#if ECB_C99 \|\| _XOPEN_VERSION >= 600 \|\| _POSIX_VERSION >= 200112L
		845	#define ecb_ldexpf(x,e) ldexpf ((x), (e))
		846	#define ecb_frexpf(x,e) frexpf ((x), (e))
		847	#else
		848	#define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
		849	#define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
		850	#endif
		851
		852	/* convert a float to ieee single/binary32 */
		853	ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
		854	ecb_function_ ecb_const uint32_t
		855	ecb_float_to_binary32 (float x)
		856	{
		857	uint32_t r;
		858
		859	#if ECB_STDFP
		860	memcpy (&r, &x, 4);
		861	#else
		862	/* slow emulation, works for anything but -0 */
		863	uint32_t m;
		864	int e;
		865
		866	if (x == 0e0f ) return 0x00000000U;
		867	if (x > +3.40282346638528860e+38f) return 0x7f800000U;
		868	if (x < -3.40282346638528860e+38f) return 0xff800000U;
		869	if (x != x ) return 0x7fbfffffU;
		870
		871	m = ecb_frexpf (x, &e) * 0x1000000U;
		872
		873	r = m & 0x80000000U;
		874
		875	if (r)
		876	m = -m;
		877
		878	if (e <= -126)
		879	{
		880	m &= 0xffffffU;
		881	m >>= (-125 - e);
		882	e = -126;
		883	}
		884
		885	r \|= (e + 126) << 23;
		886	r \|= m & 0x7fffffU;
		887	#endif
		888
		889	return r;
		890	}
		891
		892	/* converts an ieee single/binary32 to a float */
		893	ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
		894	ecb_function_ ecb_const float
		895	ecb_binary32_to_float (uint32_t x)
		896	{
		897	float r;
		898
		899	#if ECB_STDFP
		900	memcpy (&r, &x, 4);
		901	#else
		902	/* emulation, only works for normals and subnormals and +0 */
		903	int neg = x >> 31;
		904	int e = (x >> 23) & 0xffU;
		905
		906	x &= 0x7fffffU;
		907
		908	if (e)
		909	x \|= 0x800000U;
		910	else
		911	e = 1;
		912
		913	/* we distrust ldexpf a bit and do the 2*-24 scaling by an extra multiply /
		914	r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
		915
		916	r = neg ? -r : r;
		917	#endif
		918
		919	return r;
		920	}
		921
		922	/* convert a double to ieee double/binary64 */
		923	ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
		924	ecb_function_ ecb_const uint64_t
		925	ecb_double_to_binary64 (double x)
		926	{
		927	uint64_t r;
		928
		929	#if ECB_STDFP
		930	memcpy (&r, &x, 8);
		931	#else
		932	/* slow emulation, works for anything but -0 */
		933	uint64_t m;
		934	int e;
		935
		936	if (x == 0e0 ) return 0x0000000000000000U;
		937	if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
		938	if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
		939	if (x != x ) return 0X7ff7ffffffffffffU;
		940
		941	m = frexp (x, &e) * 0x20000000000000U;
		942
		943	r = m & 0x8000000000000000;;
		944
		945	if (r)
		946	m = -m;
		947
		948	if (e <= -1022)
		949	{
		950	m &= 0x1fffffffffffffU;
		951	m >>= (-1021 - e);
		952	e = -1022;
		953	}
		954
		955	r \|= ((uint64_t)(e + 1022)) << 52;
		956	r \|= m & 0xfffffffffffffU;
		957	#endif
		958
		959	return r;
		960	}
		961
		962	/* converts an ieee double/binary64 to a double */
		963	ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
		964	ecb_function_ ecb_const double
		965	ecb_binary64_to_double (uint64_t x)
		966	{
		967	double r;
		968
		969	#if ECB_STDFP
		970	memcpy (&r, &x, 8);
		971	#else
		972	/* emulation, only works for normals and subnormals and +0 */
		973	int neg = x >> 63;
		974	int e = (x >> 52) & 0x7ffU;
		975
		976	x &= 0xfffffffffffffU;
		977
		978	if (e)
		979	x \|= 0x10000000000000U;
		980	else
		981	e = 1;
		982
		983	/* we distrust ldexp a bit and do the 2*-53 scaling by an extra multiply /
		984	r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
		985
		986	r = neg ? -r : r;
		987	#endif
		988
		989	return r;
		990	}
		991
		992	/* convert a float to ieee half/binary16 */
		993	ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
		994	ecb_function_ ecb_const uint16_t
		995	ecb_float_to_binary16 (float x)
		996	{
		997	return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
		998	}
		999
		1000	/* convert an ieee half/binary16 to float */
		1001	ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
		1002	ecb_function_ ecb_const float
		1003	ecb_binary16_to_float (uint16_t x)
		1004	{
		1005	return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
		1006	}
		1007
		1008	#endif
		1009
		1010	#endif
		1011

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Comparing libeio/ecb.h (file contents): Revision 1.13 by root, Sat Jun 2 20:13:26 2012 UTC vs. Revision 1.27 by root, Mon Jan 18 11:53:09 2016 UTC

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Comparing libeio/ecb.h (file contents):
Revision 1.13 by root, Sat Jun 2 20:13:26 2012 UTC vs.
Revision 1.27 by root, Mon Jan 18 11:53:09 2016 UTC