[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 1.24 by root, Sat Jun 13 00:06:13 2015 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 0x00010004
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 UINTMAX_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	/* work around x32 idiocy by defining proper macros */
		80	#if __amd64 \|\| __x86_64 \|\| _M_AMD64 \|\| _M_X64
		81	#if _ILP32
		82	#define ECB_AMD64_X32 1
		83	#else
		84	#define ECB_AMD64 1
66	#endif	85	#endif
67	#endif	86	#endif
68		87
69	/* many compilers define _GNUC_ to some versions but then only implement	88	/* many compilers define _GNUC_ to some versions but then only implement
70	* what their idiot authors think are the "more important" extensions,	89	* what their idiot authors think are the "more important" extensions,
71	* causing enormous grief in return for some better fake benchmark numbers.	90	* causing enormous grief in return for some better fake benchmark numbers.
72	* or so.	91	* or so.
73	* we try to detect these and simply assume they are not gcc - if they have	92	* 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.	93	* an issue with that they should have done it right in the first place.
75	*/	94	*/
76	#ifndef ECB_GCC_VERSION
77	#if !defined __GNUC_MINOR__ \|\| defined __INTEL_COMPILER \|\| defined __SUNPRO_C \|\| defined __SUNPRO_CC \|\| defined __llvm__ \|\| defined __clang__	95	#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	96	#define ECB_GCC_VERSION(major,minor) 0
79	#else	97	#else
80	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))	98	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
81	#endif	99	#endif
82	#endif
83		100
84	#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */	101	#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) \|\| (__clang_major__ == (major) && __clang_minor__ >= (minor)))
85	#define ECB_C99 (__STDC_VERSION__ >= 199901L)	102
86	#define ECB_C11 (__STDC_VERSION__ >= 201112L)	103	#if __clang__ && defined __has_builtin
		104	#define ECB_CLANG_BUILTIN(x) __has_builtin (x)
		105	#else
		106	#define ECB_CLANG_BUILTIN(x) 0
		107	#endif
		108
		109	#if __clang__ && defined __has_extension
		110	#define ECB_CLANG_EXTENSION(x) __has_extension (x)
		111	#else
		112	#define ECB_CLANG_EXTENSION(x) 0
		113	#endif
		114
87	#define ECB_CPP (__cplusplus+0)	115	#define ECB_CPP (__cplusplus+0)
88	#define ECB_CPP11 (__cplusplus >= 201103L)	116	#define ECB_CPP11 (__cplusplus >= 201103L)
		117
		118	#if ECB_CPP
		119	#define ECB_C 0
		120	#define ECB_STDC_VERSION 0
		121	#else
		122	#define ECB_C 1
		123	#define ECB_STDC_VERSION __STDC_VERSION__
		124	#endif
		125
		126	#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
		127	#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
		128
		129	#if ECB_CPP
		130	#define ECB_EXTERN_C extern "C"
		131	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {
		132	#define ECB_EXTERN_C_END }
		133	#else
		134	#define ECB_EXTERN_C extern
		135	#define ECB_EXTERN_C_BEG
		136	#define ECB_EXTERN_C_END
		137	#endif
89		138
90	/*****************************************************************************/	139	/*****************************************************************************/
91		140
92	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */	141	/* 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 */	142	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
…		…
116	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__	165	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__
117	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")	166	#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__ \	167	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \
119	\|\| defined __ARM_ARCH_7M__ \|\| defined __ARM_ARCH_7R__	168	\|\| defined __ARM_ARCH_7M__ \|\| defined __ARM_ARCH_7R__
120	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")	169	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
		170	#elif __aarch64__
		171	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
121	#elif __sparc \|\| __sparc__	172	#elif (__sparc \|\| __sparc__) && !__sparcv8
122	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad" : : : "memory")	173	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad" : : : "memory")
123	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")	174	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
124	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")	175	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
125	#elif defined __s390__ \|\| defined __s390x__	176	#elif defined __s390__ \|\| defined __s390x__
126	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")	177	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
127	#elif defined __mips__	178	#elif defined __mips__
		179	/* GNU/Linux emulates sync on mips1 architectures, so we force its use */
		180	/* 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")	181	#define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
129	#elif defined __alpha__	182	#elif defined __alpha__
130	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")	183	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
131	#elif defined __hppa__	184	#elif defined __hppa__
132	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")	185	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
133	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")	186	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
134	#elif defined __ia64__	187	#elif defined __ia64__
135	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")	188	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
		189	#elif defined __m68k__
		190	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		191	#elif defined __m88k__
		192	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
		193	#elif defined __sh__
		194	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
136	#endif	195	#endif
137	#endif	196	#endif
138	#endif	197	#endif
139		198
140	#ifndef ECB_MEMORY_FENCE	199	#ifndef ECB_MEMORY_FENCE
141	#if ECB_GCC_VERSION(4,7)	200	#if ECB_GCC_VERSION(4,7)
142	/* see comment below (stdatomic.h) about the C11 memory model. */	201	/* see comment below (stdatomic.h) about the C11 memory model. */
143	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)	202	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
144	#elif defined __clang && __has_feature (cxx_atomic)	203	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
		204	#define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
		205
		206	#elif ECB_CLANG_EXTENSION(c_atomic)
145	/* see comment below (stdatomic.h) about the C11 memory model. */	207	/* see comment below (stdatomic.h) about the C11 memory model. */
146	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)	208	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
		209	#define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
		210	#define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
		211
147	#elif ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__	212	#elif ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__
148	#define ECB_MEMORY_FENCE __sync_synchronize ()	213	#define ECB_MEMORY_FENCE __sync_synchronize ()
		214	#elif _MSC_VER >= 1500 /* VC++ 2008 */
		215	/* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
		216	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		217	#define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
		218	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
		219	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
149	#elif _MSC_VER >= 1400 /* VC++ 2005 */	220	#elif _MSC_VER >= 1400 /* VC++ 2005 */
150	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)	221	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
151	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()	222	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
152	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */	223	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
153	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()	224	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
…		…
173	/* any fence other than seq_cst, which isn't very efficient for us. */	244	/* 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 */	245	/* 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 */	246	/* for most usages, or gcc and clang have a bug */
176	/* I currently lean towards the latter, and inefficiently implement */	247	/* I currently lean towards the latter, and inefficiently implement */
177	/* all three of ecb's fences as a seq_cst fence */	248	/* all three of ecb's fences as a seq_cst fence */
		249	/* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
		250	/* for all __atomic_thread_fence's except seq_cst */
178	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)	251	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
179	#endif	252	#endif
180	#endif	253	#endif
181		254
182	#ifndef ECB_MEMORY_FENCE	255	#ifndef ECB_MEMORY_FENCE
…		…
205	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE	278	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
206	#endif	279	#endif
207		280
208	/*****************************************************************************/	281	/*****************************************************************************/
209		282
210	#if __cplusplus	283	#if ECB_CPP
211	#define ecb_inline static inline	284	#define ecb_inline static inline
212	#elif ECB_GCC_VERSION(2,5)	285	#elif ECB_GCC_VERSION(2,5)
213	#define ecb_inline static __inline__	286	#define ecb_inline static __inline__
214	#elif ECB_C99	287	#elif ECB_C99
215	#define ecb_inline static inline	288	#define ecb_inline static inline
…		…
229		302
230	#define ECB_CONCAT_(a, b) a ## b	303	#define ECB_CONCAT_(a, b) a ## b
231	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	304	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
232	#define ECB_STRINGIFY_(a) # a	305	#define ECB_STRINGIFY_(a) # a
233	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)	306	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
		307	#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
234		308
235	#define ecb_function_ ecb_inline	309	#define ecb_function_ ecb_inline
236		310
237	#if ECB_GCC_VERSION(3,1)	311	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_VERSION(2,8)
238	#define ecb_attribute(attrlist) __attribute__(attrlist)	312	#define ecb_attribute(attrlist) __attribute__ (attrlist)
		313	#else
		314	#define ecb_attribute(attrlist)
		315	#endif
		316
		317	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_constant_p)
239	#define ecb_is_constant(expr) __builtin_constant_p (expr)	318	#define ecb_is_constant(expr) __builtin_constant_p (expr)
		319	#else
		320	/* possible C11 impl for integral types
		321	typedef struct ecb_is_constant_struct ecb_is_constant_struct;
		322	#define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct )0 : (void )((expr) - (expr)), ecb_is_constant_struct : 0, default: 1)) /
		323
		324	#define ecb_is_constant(expr) 0
		325	#endif
		326
		327	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_expect)
240	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))	328	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
		329	#else
		330	#define ecb_expect(expr,value) (expr)
		331	#endif
		332
		333	#if ECB_GCC_VERSION(3,1) \|\| ECB_CLANG_BUILTIN(__builtin_prefetch)
241	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)	334	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
242	#else	335	#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)	336	#define ecb_prefetch(addr,rw,locality)
247	#endif	337	#endif
248		338
249	/* no emulation for ecb_decltype */	339	/* no emulation for ecb_decltype */
250	#if ECB_GCC_VERSION(4,5)	340	#if ECB_CPP11
		341	// older implementations might have problems with decltype(x)::type, work around it
		342	template<class T> struct ecb_decltype_t { typedef T type; };
251	#define ecb_decltype(x) __decltype(x)	343	#define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
252	#elif ECB_GCC_VERSION(3,0)	344	#elif ECB_GCC_VERSION(3,0) \|\| ECB_CLANG_VERSION(2,8)
253	#define ecb_decltype(x) __typeof(x)	345	#define ecb_decltype(x) __typeof__ (x)
254	#endif	346	#endif
255		347
		348	#if _MSC_VER >= 1300
		349	#define ecb_deprecated __declspec (deprecated)
		350	#else
		351	#define ecb_deprecated ecb_attribute ((__deprecated__))
		352	#endif
		353
		354	#if __MSC_VER >= 1500
		355	#define ecb_deprecated_message(msg) __declspec (deprecated (msg))
		356	#elif ECB_GCC_VERSION(4,5)
		357	#define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
		358	#else
		359	#define ecb_deprecated_message(msg) ecb_deprecated
		360	#endif
		361
		362	#if _MSC_VER >= 1400
		363	#define ecb_noinline __declspec (noinline)
		364	#else
256	#define ecb_noinline ecb_attribute ((__noinline__))	365	#define ecb_noinline ecb_attribute ((__noinline__))
		366	#endif
		367
257	#define ecb_unused ecb_attribute ((__unused__))	368	#define ecb_unused ecb_attribute ((__unused__))
258	#define ecb_const ecb_attribute ((__const__))	369	#define ecb_const ecb_attribute ((__const__))
259	#define ecb_pure ecb_attribute ((__pure__))	370	#define ecb_pure ecb_attribute ((__pure__))
260		371
261	#if ECB_C11	372	/* TODO http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx __declspec(noreturn) */
		373	#if ECB_C11 \|\| __IBMC_NORETURN
		374	/* http://pic.dhe.ibm.com/infocenter/compbg/v121v141/topic/com.ibm.xlcpp121.bg.doc/language_ref/noreturn.html */
262	#define ecb_noreturn _Noreturn	375	#define ecb_noreturn _Noreturn
		376	#elif ECB_CPP11
		377	#define ecb_noreturn [[noreturn]]
		378	#elif _MSC_VER >= 1200
		379	#define ecb_noreturn __declspec (noreturn)
263	#else	380	#else
264	#define ecb_noreturn ecb_attribute ((__noreturn__))	381	#define ecb_noreturn ecb_attribute ((__noreturn__))
265	#endif	382	#endif
266		383
267	#if ECB_GCC_VERSION(4,3)	384	#if ECB_GCC_VERSION(4,3)
…		…
282	/* for compatibility to the rest of the world */	399	/* for compatibility to the rest of the world */
283	#define ecb_likely(expr) ecb_expect_true (expr)	400	#define ecb_likely(expr) ecb_expect_true (expr)
284	#define ecb_unlikely(expr) ecb_expect_false (expr)	401	#define ecb_unlikely(expr) ecb_expect_false (expr)
285		402
286	/* count trailing zero bits and count # of one bits */	403	/* count trailing zero bits and count # of one bits */
287	#if ECB_GCC_VERSION(3,4)	404	#if ECB_GCC_VERSION(3,4) \
		405	\|\| (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
		406	&& ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
		407	&& ECB_CLANG_BUILTIN(__builtin_popcount))
288	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */	408	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
289	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)	409	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
290	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)	410	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
291	#define ecb_ctz32(x) __builtin_ctz (x)	411	#define ecb_ctz32(x) __builtin_ctz (x)
292	#define ecb_ctz64(x) __builtin_ctzll (x)	412	#define ecb_ctz64(x) __builtin_ctzll (x)
293	#define ecb_popcount32(x) __builtin_popcount (x)	413	#define ecb_popcount32(x) __builtin_popcount (x)
294	/* no popcountll */	414	/* no popcountll */
295	#else	415	#else
296	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;	416	ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
297	ecb_function_ int	417	ecb_function_ ecb_const int
298	ecb_ctz32 (uint32_t x)	418	ecb_ctz32 (uint32_t x)
299	{	419	{
300	int r = 0;	420	int r = 0;
301		421
302	x &= ~x + 1; /* this isolates the lowest bit */	422	x &= ~x + 1; /* this isolates the lowest bit */
…		…
316	#endif	436	#endif
317		437
318	return r;	438	return r;
319	}	439	}
320		440
321	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;	441	ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
322	ecb_function_ int	442	ecb_function_ ecb_const int
323	ecb_ctz64 (uint64_t x)	443	ecb_ctz64 (uint64_t x)
324	{	444	{
325	int shift = x & 0xffffffffU ? 0 : 32;	445	int shift = x & 0xffffffffU ? 0 : 32;
326	return ecb_ctz32 (x >> shift) + shift;	446	return ecb_ctz32 (x >> shift) + shift;
327	}	447	}
328		448
329	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;	449	ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
330	ecb_function_ int	450	ecb_function_ ecb_const int
331	ecb_popcount32 (uint32_t x)	451	ecb_popcount32 (uint32_t x)
332	{	452	{
333	x -= (x >> 1) & 0x55555555;	453	x -= (x >> 1) & 0x55555555;
334	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);	454	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
335	x = ((x >> 4) + x) & 0x0f0f0f0f;	455	x = ((x >> 4) + x) & 0x0f0f0f0f;
336	x *= 0x01010101;	456	x *= 0x01010101;
337		457
338	return x >> 24;	458	return x >> 24;
339	}	459	}
340		460
341	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;	461	ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
342	ecb_function_ int ecb_ld32 (uint32_t x)	462	ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
343	{	463	{
344	int r = 0;	464	int r = 0;
345		465
346	if (x >> 16) { x >>= 16; r += 16; }	466	if (x >> 16) { x >>= 16; r += 16; }
347	if (x >> 8) { x >>= 8; r += 8; }	467	if (x >> 8) { x >>= 8; r += 8; }
…		…
350	if (x >> 1) { r += 1; }	470	if (x >> 1) { r += 1; }
351		471
352	return r;	472	return r;
353	}	473	}
354		474
355	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;	475	ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
356	ecb_function_ int ecb_ld64 (uint64_t x)	476	ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
357	{	477	{
358	int r = 0;	478	int r = 0;
359		479
360	if (x >> 32) { x >>= 32; r += 32; }	480	if (x >> 32) { x >>= 32; r += 32; }
361		481
362	return r + ecb_ld32 (x);	482	return r + ecb_ld32 (x);
363	}	483	}
364	#endif	484	#endif
365		485
366	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;	486	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)); }	487	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;	488	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)); }	489	ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
370		490
371	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;	491	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
372	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)	492	ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
373	{	493	{
374	return ( (x * 0x0802U & 0x22110U)	494	return ( (x * 0x0802U & 0x22110U)
375	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;	495	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
376	}	496	}
377		497
378	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;	498	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
379	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)	499	ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
380	{	500	{
381	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);	501	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);
382	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);	502	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);
383	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);	503	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);
384	x = ( x >> 8 ) \| ( x << 8);	504	x = ( x >> 8 ) \| ( x << 8);
385		505
386	return x;	506	return x;
387	}	507	}
388		508
389	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;	509	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
390	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)	510	ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
391	{	511	{
392	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);	512	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);
393	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);	513	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);
394	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);	514	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);
395	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);	515	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);
…		…
398	return x;	518	return x;
399	}	519	}
400		520
401	/* popcount64 is only available on 64 bit cpus as gcc builtin */	521	/* popcount64 is only available on 64 bit cpus as gcc builtin */
402	/* so for this version we are lazy */	522	/* so for this version we are lazy */
403	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;	523	ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
404	ecb_function_ int	524	ecb_function_ ecb_const int
405	ecb_popcount64 (uint64_t x)	525	ecb_popcount64 (uint64_t x)
406	{	526	{
407	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);	527	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
408	}	528	}
409		529
410	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;	530	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;	531	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;	532	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;	533	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;	534	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;	535	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;	536	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;	537	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
418		538
419	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }	539	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); }	540	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); }	541	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); }	542	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); }	543	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); }	544	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); }	545	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); }	546	ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }
427		547
428	#if ECB_GCC_VERSION(4,3)	548	#if ECB_GCC_VERSION(4,3) \|\| (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
429	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)	549	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
430	#define ecb_bswap32(x) __builtin_bswap32 (x)	550	#define ecb_bswap32(x) __builtin_bswap32 (x)
431	#define ecb_bswap64(x) __builtin_bswap64 (x)	551	#define ecb_bswap64(x) __builtin_bswap64 (x)
432	#else	552	#else
433	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;	553	ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
434	ecb_function_ uint16_t	554	ecb_function_ ecb_const uint16_t
435	ecb_bswap16 (uint16_t x)	555	ecb_bswap16 (uint16_t x)
436	{	556	{
437	return ecb_rotl16 (x, 8);	557	return ecb_rotl16 (x, 8);
438	}	558	}
439		559
440	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;	560	ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
441	ecb_function_ uint32_t	561	ecb_function_ ecb_const uint32_t
442	ecb_bswap32 (uint32_t x)	562	ecb_bswap32 (uint32_t x)
443	{	563	{
444	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);	564	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);
445	}	565	}
446		566
447	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;	567	ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
448	ecb_function_ uint64_t	568	ecb_function_ ecb_const uint64_t
449	ecb_bswap64 (uint64_t x)	569	ecb_bswap64 (uint64_t x)
450	{	570	{
451	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);	571	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);
452	}	572	}
453	#endif	573	#endif
454		574
455	#if ECB_GCC_VERSION(4,5)	575	#if ECB_GCC_VERSION(4,5) \|\| ECB_CLANG_BUILTIN(__builtin_unreachable)
456	#define ecb_unreachable() __builtin_unreachable ()	576	#define ecb_unreachable() __builtin_unreachable ()
457	#else	577	#else
458	/* this seems to work fine, but gcc always emits a warning for it :/ */	578	/* this seems to work fine, but gcc always emits a warning for it :/ */
459	ecb_inline void ecb_unreachable (void) ecb_noreturn;	579	ecb_inline ecb_noreturn void ecb_unreachable (void);
460	ecb_inline void ecb_unreachable (void) { }	580	ecb_inline ecb_noreturn void ecb_unreachable (void) { }
461	#endif	581	#endif
462		582
463	/* try to tell the compiler that some condition is definitely true */	583	/* try to tell the compiler that some condition is definitely true */
464	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)	584	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
465		585
466	ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;	586	ecb_inline ecb_const unsigned char ecb_byteorder_helper (void);
467	ecb_inline unsigned char	587	ecb_inline ecb_const unsigned char
468	ecb_byteorder_helper (void)	588	ecb_byteorder_helper (void)
469	{	589	{
470	const uint32_t u = 0x11223344;	590	/* the union code still generates code under pressure in gcc, */
471	return (unsigned char )&u;	591	/* but less than using pointers, and always seems to */
		592	/* successfully return a constant. */
		593	/* the reason why we have this horrible preprocessor mess */
		594	/* is to avoid it in all cases, at least on common architectures */
		595	/* or when using a recent enough gcc version (>= 4.6) */
		596	#if __i386 \|\| __i386__ \|\| _M_X86 \|\| __amd64 \|\| __amd64__ \|\| _M_X64
		597	return 0x44;
		598	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
		599	return 0x44;
		600	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
		601	return 0x11;
		602	#else
		603	union
		604	{
		605	uint32_t i;
		606	uint8_t c;
		607	} u = { 0x11223344 };
		608	return u.c;
		609	#endif
472	}	610	}
473		611
474	ecb_inline ecb_bool ecb_big_endian (void) ecb_const;	612	ecb_inline ecb_const ecb_bool ecb_big_endian (void);
475	ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }	613	ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
476	ecb_inline ecb_bool ecb_little_endian (void) ecb_const;	614	ecb_inline ecb_const ecb_bool ecb_little_endian (void);
477	ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }	615	ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
478		616
479	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99	617	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
480	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))	618	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
481	#else	619	#else
482	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))	620	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
483	#endif	621	#endif
484		622
485	#if __cplusplus	623	#if ECB_CPP
486	template<typename T>	624	template<typename T>
487	static inline T ecb_div_rd (T val, T div)	625	static inline T ecb_div_rd (T val, T div)
488	{	626	{
489	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;	627	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
490	}	628	}
…		…
507	}	645	}
508	#else	646	#else
509	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	647	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
510	#endif	648	#endif
511		649
		650	/*******************************************************************************/
		651	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
		652
		653	/* basically, everything uses "ieee pure-endian" floating point numbers */
		654	/* the only noteworthy exception is ancient armle, which uses order 43218765 */
		655	#if 0 \
		656	\|\| __i386 \|\| __i386__ \
		657	\|\| __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__ \
		658	\|\| __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__ \
		659	\|\| defined __s390__ \|\| defined __s390x__ \
		660	\|\| defined __mips__ \
		661	\|\| defined __alpha__ \
		662	\|\| defined __hppa__ \
		663	\|\| defined __ia64__ \
		664	\|\| defined __m68k__ \
		665	\|\| defined __m88k__ \
		666	\|\| defined __sh__ \
		667	\|\| defined _M_IX86 \|\| defined _M_AMD64 \|\| defined _M_IA64 \
		668	\|\| (defined __arm__ && (defined __ARM_EABI__ \|\| defined __EABI__ \|\| defined __VFP_FP__ \|\| defined _WIN32_WCE \|\| defined __ANDROID__)) \
		669	\|\| defined __aarch64__
		670	#define ECB_STDFP 1
		671	#include <string.h> /* for memcpy */
		672	#else
		673	#define ECB_STDFP 0
		674	#endif
		675
		676	#ifndef ECB_NO_LIBM
		677
		678	#include <math.h> /* for frexp, ldexp, INFINITY, NAN */
		679
		680	/* only the oldest of old doesn't have this one. solaris. */
		681	#ifdef INFINITY
		682	#define ECB_INFINITY INFINITY
		683	#else
		684	#define ECB_INFINITY HUGE_VAL
512	#endif	685	#endif
513		686
		687	#ifdef NAN
		688	#define ECB_NAN NAN
		689	#else
		690	#define ECB_NAN ECB_INFINITY
		691	#endif
		692
		693	#if ECB_C99 \|\| _XOPEN_VERSION >= 600 \|\| _POSIX_VERSION >= 200112L
		694	#define ecb_ldexpf(x,e) ldexpf ((x), (e))
		695	#else
		696	#define ecb_ldexpf(x,e) (float) ldexp ((x), (e))
		697	#endif
		698
		699	/* converts an ieee half/binary16 to a float */
		700	ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
		701	ecb_function_ ecb_const float
		702	ecb_binary16_to_float (uint16_t x)
		703	{
		704	int e = (x >> 10) & 0x1f;
		705	int m = x & 0x3ff;
		706	float r;
		707
		708	if (!e ) r = ecb_ldexpf (m , -24);
		709	else if (e != 31) r = ecb_ldexpf (m + 0x400, e - 25);
		710	else if (m ) r = ECB_NAN;
		711	else r = ECB_INFINITY;
		712
		713	return x & 0x8000 ? -r : r;
		714	}
		715
		716	/* convert a float to ieee single/binary32 */
		717	ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
		718	ecb_function_ ecb_const uint32_t
		719	ecb_float_to_binary32 (float x)
		720	{
		721	uint32_t r;
		722
		723	#if ECB_STDFP
		724	memcpy (&r, &x, 4);
		725	#else
		726	/* slow emulation, works for anything but -0 */
		727	uint32_t m;
		728	int e;
		729
		730	if (x == 0e0f ) return 0x00000000U;
		731	if (x > +3.40282346638528860e+38f) return 0x7f800000U;
		732	if (x < -3.40282346638528860e+38f) return 0xff800000U;
		733	if (x != x ) return 0x7fbfffffU;
		734
		735	m = frexpf (x, &e) * 0x1000000U;
		736
		737	r = m & 0x80000000U;
		738
		739	if (r)
		740	m = -m;
		741
		742	if (e <= -126)
		743	{
		744	m &= 0xffffffU;
		745	m >>= (-125 - e);
		746	e = -126;
		747	}
		748
		749	r \|= (e + 126) << 23;
		750	r \|= m & 0x7fffffU;
		751	#endif
		752
		753	return r;
		754	}
		755
		756	/* converts an ieee single/binary32 to a float */
		757	ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
		758	ecb_function_ ecb_const float
		759	ecb_binary32_to_float (uint32_t x)
		760	{
		761	float r;
		762
		763	#if ECB_STDFP
		764	memcpy (&r, &x, 4);
		765	#else
		766	/* emulation, only works for normals and subnormals and +0 */
		767	int neg = x >> 31;
		768	int e = (x >> 23) & 0xffU;
		769
		770	x &= 0x7fffffU;
		771
		772	if (e)
		773	x \|= 0x800000U;
		774	else
		775	e = 1;
		776
		777	/* we distrust ldexpf a bit and do the 2*-24 scaling by an extra multiply /
		778	r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
		779
		780	r = neg ? -r : r;
		781	#endif
		782
		783	return r;
		784	}
		785
		786	/* convert a double to ieee double/binary64 */
		787	ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
		788	ecb_function_ ecb_const uint64_t
		789	ecb_double_to_binary64 (double x)
		790	{
		791	uint64_t r;
		792
		793	#if ECB_STDFP
		794	memcpy (&r, &x, 8);
		795	#else
		796	/* slow emulation, works for anything but -0 */
		797	uint64_t m;
		798	int e;
		799
		800	if (x == 0e0 ) return 0x0000000000000000U;
		801	if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
		802	if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
		803	if (x != x ) return 0X7ff7ffffffffffffU;
		804
		805	m = frexp (x, &e) * 0x20000000000000U;
		806
		807	r = m & 0x8000000000000000;;
		808
		809	if (r)
		810	m = -m;
		811
		812	if (e <= -1022)
		813	{
		814	m &= 0x1fffffffffffffU;
		815	m >>= (-1021 - e);
		816	e = -1022;
		817	}
		818
		819	r \|= ((uint64_t)(e + 1022)) << 52;
		820	r \|= m & 0xfffffffffffffU;
		821	#endif
		822
		823	return r;
		824	}
		825
		826	/* converts an ieee double/binary64 to a double */
		827	ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
		828	ecb_function_ ecb_const double
		829	ecb_binary64_to_double (uint64_t x)
		830	{
		831	double r;
		832
		833	#if ECB_STDFP
		834	memcpy (&r, &x, 8);
		835	#else
		836	/* emulation, only works for normals and subnormals and +0 */
		837	int neg = x >> 63;
		838	int e = (x >> 52) & 0x7ffU;
		839
		840	x &= 0xfffffffffffffU;
		841
		842	if (e)
		843	x \|= 0x10000000000000U;
		844	else
		845	e = 1;
		846
		847	/* we distrust ldexp a bit and do the 2*-53 scaling by an extra multiply /
		848	r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
		849
		850	r = neg ? -r : r;
		851	#endif
		852
		853	return r;
		854	}
		855
		856	#endif
		857
		858	#endif
		859

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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 1.24 by root, Sat Jun 13 00:06:13 2015 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 1.24 by root, Sat Jun 13 00:06:13 2015 UTC