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

Comparing libecb/ecb.h (file contents):
Revision 1.14 by root, Thu May 26 18:26:59 2011 UTC vs.
Revision 1.134 by root, Mon Jun 9 17:31:57 2014 UTC

…		…
1	/*	1	/*
2	* libecb	2	* libecb - http://software.schmorp.de/pkg/libecb
3	*	3	*
4	* Copyright (©) 2009-2011 Marc Alexander Lehmann	4	* Copyright (©) 2009-2014 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
		44	/* 16 bits major, 16 bits minor */
		45	#define ECB_VERSION 0x00010003
		46
		47	#ifdef _WIN32
		48	typedef signed char int8_t;
		49	typedef unsigned char uint8_t;
		50	typedef signed short int16_t;
		51	typedef unsigned short uint16_t;
		52	typedef signed int int32_t;
		53	typedef unsigned int uint32_t;
		54	#if __GNUC__
		55	typedef signed long long int64_t;
		56	typedef unsigned long long uint64_t;
		57	#else /* _MSC_VER \|\| __BORLANDC__ */
		58	typedef signed __int64 int64_t;
		59	typedef unsigned __int64 uint64_t;
		60	#endif
		61	#ifdef _WIN64
		62	#define ECB_PTRSIZE 8
		63	typedef uint64_t uintptr_t;
		64	typedef int64_t intptr_t;
		65	#else
		66	#define ECB_PTRSIZE 4
		67	typedef uint32_t uintptr_t;
		68	typedef int32_t intptr_t;
		69	#endif
		70	#else
33	#include <inttypes.h>	71	#include <inttypes.h>
		72	#if UINTMAX_MAX > 0xffffffffU
		73	#define ECB_PTRSIZE 8
		74	#else
		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
		85	#endif
		86	#endif
34		87
35	/* many compilers define _GNUC_ to some versions but then only implement	88	/* many compilers define _GNUC_ to some versions but then only implement
36	* what their idiot authors think are the "more important" extensions,	89	* what their idiot authors think are the "more important" extensions,
37	* causing enourmous grief for some better fake benchmark numbers or so.	90	* causing enormous grief in return for some better fake benchmark numbers.
		91	* or so.
38	* 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
39	* 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.
40	*/	94	*/
41	#ifndef ECB_GCC_VERSION	95	#ifndef ECB_GCC_VERSION
42	# if defined(__INTEL_COMPILER) \|\| defined(__SUNPRO_C) \|\| defined(__llvm__)	96	#if !defined __GNUC_MINOR__ \|\| defined __INTEL_COMPILER \|\| defined __SUNPRO_C \|\| defined __SUNPRO_CC \|\| defined __llvm__ \|\| defined __clang__
43	# define ECB_GCC_VERSION(major,minor) 0	97	#define ECB_GCC_VERSION(major,minor) 0
44	# else	98	#else
45	# define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))	99	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
		100	#endif
46	# endif	101	#endif
47	#endif
48		102
49	#ifndef __cplusplus	103	#define ECB_CPP (__cplusplus+0)
50	# if __STDC_VERSION__ >= 199901L	104	#define ECB_CPP11 (__cplusplus >= 201103L)
51	# define ECB_INLINE inline	105
52	typedef _Bool ecb_bool;	106	#if ECB_CPP
		107	#define ECB_C 0
		108	#define ECB_STDC_VERSION 0
53	# else	109	#else
54	# define ECB_INLINE inline /* yeah! */	110	#define ECB_C 1
		111	#define ECB_STDC_VERSION __STDC_VERSION__
		112	#endif
		113
		114	#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
		115	#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
		116
		117	#if ECB_CPP
		118	#define ECB_EXTERN_C extern "C"
		119	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {
		120	#define ECB_EXTERN_C_END }
		121	#else
		122	#define ECB_EXTERN_C extern
		123	#define ECB_EXTERN_C_BEG
		124	#define ECB_EXTERN_C_END
		125	#endif
		126
		127	/*****************************************************************************/
		128
		129	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
		130	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
		131
		132	#if ECB_NO_THREADS
		133	#define ECB_NO_SMP 1
		134	#endif
		135
		136	#if ECB_NO_SMP
		137	#define ECB_MEMORY_FENCE do { } while (0)
		138	#endif
		139
		140	#ifndef ECB_MEMORY_FENCE
		141	#if ECB_GCC_VERSION(2,5) \|\| defined __INTEL_COMPILER \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		142	#if __i386 \|\| __i386__
		143	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
		144	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
		145	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		146	#elif __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__
		147	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
		148	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
		149	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		150	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__
		151	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		152	#elif defined __ARM_ARCH_6__ \|\| defined __ARM_ARCH_6J__ \
		153	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__
		154	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
		155	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \
		156	\|\| defined __ARM_ARCH_7M__ \|\| defined __ARM_ARCH_7R__
		157	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
		158	#elif __aarch64__
		159	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
		160	#elif (__sparc \|\| __sparc__) && !__sparcv8
		161	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad" : : : "memory")
		162	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
		163	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
		164	#elif defined __s390__ \|\| defined __s390x__
		165	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
		166	#elif defined __mips__
		167	/* GNU/Linux emulates sync on mips1 architectures, so we force its use */
		168	/* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
		169	#define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
		170	#elif defined __alpha__
		171	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
		172	#elif defined __hppa__
		173	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		174	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		175	#elif defined __ia64__
		176	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
		177	#elif defined __m68k__
		178	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		179	#elif defined __m88k__
		180	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
		181	#elif defined __sh__
		182	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		183	#endif
		184	#endif
		185	#endif
		186
		187	#ifndef ECB_MEMORY_FENCE
		188	#if ECB_GCC_VERSION(4,7)
		189	/* see comment below (stdatomic.h) about the C11 memory model. */
		190	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
		191	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
		192	#define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
		193
		194	/* The __has_feature syntax from clang is so misdesigned that we cannot use it
		195	* without risking compile time errors with other compilers. We could
		196	* define our own ecb_clang_has_feature, but I just can't be bothered to work
		197	* around this shit time and again.
		198	* #elif defined __clang && __has_feature (cxx_atomic)
		199	* // see comment below (stdatomic.h) about the C11 memory model.
		200	* #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
		201	* #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
		202	* #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
		203	*/
		204
		205	#elif ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__
		206	#define ECB_MEMORY_FENCE __sync_synchronize ()
		207	#elif _MSC_VER >= 1500 /* VC++ 2008 */
		208	/* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
		209	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		210	#define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
		211	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
		212	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
		213	#elif _MSC_VER >= 1400 /* VC++ 2005 */
		214	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		215	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
		216	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
		217	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
		218	#elif defined _WIN32
		219	#include <WinNT.h>
		220	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
		221	#elif __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		222	#include <mbarrier.h>
		223	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
		224	#define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
		225	#define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
		226	#elif __xlC__
		227	#define ECB_MEMORY_FENCE __sync ()
		228	#endif
		229	#endif
		230
		231	#ifndef ECB_MEMORY_FENCE
		232	#if ECB_C11 && !defined __STDC_NO_ATOMICS__
		233	/* we assume that these memory fences work on all variables/all memory accesses, */
		234	/* not just C11 atomics and atomic accesses */
		235	#include <stdatomic.h>
		236	/* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
		237	/* any fence other than seq_cst, which isn't very efficient for us. */
		238	/* Why that is, we don't know - either the C11 memory model is quite useless */
		239	/* for most usages, or gcc and clang have a bug */
		240	/* I currently lean towards the latter, and inefficiently implement */
		241	/* all three of ecb's fences as a seq_cst fence */
		242	/* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
		243	/* for all __atomic_thread_fence's except seq_cst */
		244	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
		245	#endif
		246	#endif
		247
		248	#ifndef ECB_MEMORY_FENCE
		249	#if !ECB_AVOID_PTHREADS
		250	/*
		251	* if you get undefined symbol references to pthread_mutex_lock,
		252	* or failure to find pthread.h, then you should implement
		253	* the ECB_MEMORY_FENCE operations for your cpu/compiler
		254	* OR provide pthread.h and link against the posix thread library
		255	* of your system.
		256	*/
		257	#include <pthread.h>
		258	#define ECB_NEEDS_PTHREADS 1
		259	#define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
		260
		261	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
		262	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
		263	#endif
		264	#endif
		265
		266	#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
		267	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
		268	#endif
		269
		270	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
		271	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
		272	#endif
		273
		274	/*****************************************************************************/
		275
		276	#if __cplusplus
		277	#define ecb_inline static inline
		278	#elif ECB_GCC_VERSION(2,5)
		279	#define ecb_inline static __inline__
		280	#elif ECB_C99
		281	#define ecb_inline static inline
		282	#else
		283	#define ecb_inline static
		284	#endif
		285
		286	#if ECB_GCC_VERSION(3,3)
		287	#define ecb_restrict __restrict__
		288	#elif ECB_C99
		289	#define ecb_restrict restrict
		290	#else
		291	#define ecb_restrict
		292	#endif
		293
55	typedef int ecb_bool;	294	typedef int ecb_bool;
56	# endif
57	#endif
58		295
59	#define ECB_CONCAT_(a, b) a ## b	296	#define ECB_CONCAT_(a, b) a ## b
60	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	297	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
61	#define ECB_STRINGIFY_(a) # a	298	#define ECB_STRINGIFY_(a) # a
62	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)	299	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
63		300
64	#define ECB_HEADER_INLINE static ECB_INLINE	301	#define ecb_function_ ecb_inline
65		302
66	#if ECB_GCC_VERSION(3,1)	303	#if ECB_GCC_VERSION(3,1)
67	# define ecb_attribute(attrlist) __attribute__(attrlist)	304	#define ecb_attribute(attrlist) __attribute__(attrlist)
68	# define ecb_is_constant(c) __builtin_constant_p (c)	305	#define ecb_is_constant(expr) __builtin_constant_p (expr)
69	# define ecb_expect(expr,value) __builtin_expect ((expr),(value))	306	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
70	# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)	307	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
71	#else	308	#else
72	# define ecb_attribute(attrlist)	309	#define ecb_attribute(attrlist)
		310
		311	/* possible C11 impl for integral types
		312	typedef struct ecb_is_constant_struct ecb_is_constant_struct;
		313	#define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct )0 : (void )((expr) - (expr)), ecb_is_constant_struct : 0, default: 1)) /
		314
73	# define ecb_is_constant(c) 0	315	#define ecb_is_constant(expr) 0
74	# define ecb_expect(expr,value) (expr)	316	#define ecb_expect(expr,value) (expr)
75	# define ecb_prefetch(addr,rw,locality)	317	#define ecb_prefetch(addr,rw,locality)
76	#endif	318	#endif
77		319
78	/* no emulation for ecb_decltype */	320	/* no emulation for ecb_decltype */
79	#if ECB_GCC_VERSION(4,5)	321	#if ECB_GCC_VERSION(4,5)
80	# define ecb_decltype(x) __decltype(x)	322	#define ecb_decltype(x) __decltype(x)
81	#elif ECB_GCC_VERSION(3,0)	323	#elif ECB_GCC_VERSION(3,0)
82	# define ecb_decltype(x) typeof(x)	324	#define ecb_decltype(x) __typeof(x)
83	#endif	325	#endif
84		326
		327	#define ecb_deprecated ecb_attribute ((__deprecated__))
85	#define ecb_noinline ecb_attribute ((noinline))	328	#define ecb_noinline ecb_attribute ((__noinline__))
86	#define ecb_noreturn ecb_attribute ((noreturn))
87	#define ecb_unused ecb_attribute ((unused))	329	#define ecb_unused ecb_attribute ((__unused__))
88	#define ecb_const ecb_attribute ((const))	330	#define ecb_const ecb_attribute ((__const__))
89	#define ecb_pure ecb_attribute ((pure))	331	#define ecb_pure ecb_attribute ((__pure__))
		332
		333	#if ECB_C11
		334	#define ecb_noreturn _Noreturn
		335	#else
		336	#define ecb_noreturn ecb_attribute ((__noreturn__))
		337	#endif
		338
		339	#if ECB_GCC_VERSION(4,3)
		340	#define ecb_artificial ecb_attribute ((__artificial__))
90	#define ecb_hot ecb_attribute ((hot)) /* 4.3 */	341	#define ecb_hot ecb_attribute ((__hot__))
91	#define ecb_cold ecb_attribute ((cold)) /* 4.3 */	342	#define ecb_cold ecb_attribute ((__cold__))
		343	#else
		344	#define ecb_artificial
		345	#define ecb_hot
		346	#define ecb_cold
		347	#endif
92		348
93	/* put into ifs if you are very sure that the expression */	349	/* put around conditional expressions if you are very sure that the */
94	/* is mostly true or mosty false. note that these return */	350	/* expression is mostly true or mostly false. note that these return */
95	/* booleans, not the expression. */	351	/* booleans, not the expression. */
96	#define ecb_unlikely(expr) ecb_expect (!!(expr), 0)	352	#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
		353	#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
		354	/* for compatibility to the rest of the world */
97	#define ecb_likely(expr) ecb_expect (!!(expr), 1)	355	#define ecb_likely(expr) ecb_expect_true (expr)
		356	#define ecb_unlikely(expr) ecb_expect_false (expr)
		357
		358	/* count trailing zero bits and count # of one bits */
		359	#if ECB_GCC_VERSION(3,4)
		360	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
		361	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
		362	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
		363	#define ecb_ctz32(x) __builtin_ctz (x)
		364	#define ecb_ctz64(x) __builtin_ctzll (x)
		365	#define ecb_popcount32(x) __builtin_popcount (x)
		366	/* no popcountll */
		367	#else
		368	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
		369	ecb_function_ int
		370	ecb_ctz32 (uint32_t x)
		371	{
		372	int r = 0;
		373
		374	x &= ~x + 1; /* this isolates the lowest bit */
		375
		376	#if ECB_branchless_on_i386
		377	r += !!(x & 0xaaaaaaaa) << 0;
		378	r += !!(x & 0xcccccccc) << 1;
		379	r += !!(x & 0xf0f0f0f0) << 2;
		380	r += !!(x & 0xff00ff00) << 3;
		381	r += !!(x & 0xffff0000) << 4;
		382	#else
		383	if (x & 0xaaaaaaaa) r += 1;
		384	if (x & 0xcccccccc) r += 2;
		385	if (x & 0xf0f0f0f0) r += 4;
		386	if (x & 0xff00ff00) r += 8;
		387	if (x & 0xffff0000) r += 16;
		388	#endif
		389
		390	return r;
		391	}
		392
		393	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
		394	ecb_function_ int
		395	ecb_ctz64 (uint64_t x)
		396	{
		397	int shift = x & 0xffffffffU ? 0 : 32;
		398	return ecb_ctz32 (x >> shift) + shift;
		399	}
		400
		401	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
		402	ecb_function_ int
		403	ecb_popcount32 (uint32_t x)
		404	{
		405	x -= (x >> 1) & 0x55555555;
		406	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
		407	x = ((x >> 4) + x) & 0x0f0f0f0f;
		408	x *= 0x01010101;
		409
		410	return x >> 24;
		411	}
		412
		413	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
		414	ecb_function_ int ecb_ld32 (uint32_t x)
		415	{
		416	int r = 0;
		417
		418	if (x >> 16) { x >>= 16; r += 16; }
		419	if (x >> 8) { x >>= 8; r += 8; }
		420	if (x >> 4) { x >>= 4; r += 4; }
		421	if (x >> 2) { x >>= 2; r += 2; }
		422	if (x >> 1) { r += 1; }
		423
		424	return r;
		425	}
		426
		427	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
		428	ecb_function_ int ecb_ld64 (uint64_t x)
		429	{
		430	int r = 0;
		431
		432	if (x >> 32) { x >>= 32; r += 32; }
		433
		434	return r + ecb_ld32 (x);
		435	}
		436	#endif
		437
		438	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
		439	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
		440	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
		441	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
		442
		443	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
		444	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
		445	{
		446	return ( (x * 0x0802U & 0x22110U)
		447	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
		448	}
		449
		450	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
		451	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
		452	{
		453	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);
		454	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);
		455	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);
		456	x = ( x >> 8 ) \| ( x << 8);
		457
		458	return x;
		459	}
		460
		461	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
		462	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
		463	{
		464	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);
		465	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);
		466	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);
		467	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);
		468	x = ( x >> 16 ) \| ( x << 16);
		469
		470	return x;
		471	}
		472
		473	/* popcount64 is only available on 64 bit cpus as gcc builtin */
		474	/* so for this version we are lazy */
		475	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
		476	ecb_function_ int
		477	ecb_popcount64 (uint64_t x)
		478	{
		479	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
		480	}
		481
		482	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
		483	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
		484	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
		485	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
		486	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
		487	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
		488	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
		489	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
		490
		491	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }
		492	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }
		493	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }
		494	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }
		495	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }
		496	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }
		497	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }
		498	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }
		499
		500	#if ECB_GCC_VERSION(4,3)
		501	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
		502	#define ecb_bswap32(x) __builtin_bswap32 (x)
		503	#define ecb_bswap64(x) __builtin_bswap64 (x)
		504	#else
		505	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
		506	ecb_function_ uint16_t
		507	ecb_bswap16 (uint16_t x)
		508	{
		509	return ecb_rotl16 (x, 8);
		510	}
		511
		512	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
		513	ecb_function_ uint32_t
		514	ecb_bswap32 (uint32_t x)
		515	{
		516	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);
		517	}
		518
		519	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
		520	ecb_function_ uint64_t
		521	ecb_bswap64 (uint64_t x)
		522	{
		523	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);
		524	}
		525	#endif
		526
		527	#if ECB_GCC_VERSION(4,5)
		528	#define ecb_unreachable() __builtin_unreachable ()
		529	#else
		530	/* this seems to work fine, but gcc always emits a warning for it :/ */
		531	ecb_inline void ecb_unreachable (void) ecb_noreturn;
		532	ecb_inline void ecb_unreachable (void) { }
		533	#endif
98		534
99	/* try to tell the compiler that some condition is definitely true */	535	/* try to tell the compiler that some condition is definitely true */
100	#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0)	536	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
101		537
102	/* count trailing zero bits and count # of one bits */	538	ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
103	ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;	539	ecb_inline unsigned char
104	ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;	540	ecb_byteorder_helper (void)
105	#if ECB_GCC_VERSION(3,4)
106	ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); }
107	ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); }
108	#else
109	ECB_HEADER_INLINE
110	ecb_ctz32 (uint32_t x)
111	{	541	{
112	int r = 0;	542	/* the union code still generates code under pressure in gcc, */
113		543	/* but less than using pointers, and always seems to */
114	x &= -x; /* this isolates the lowest bit */	544	/* successfully return a constant. */
115		545	/* the reason why we have this horrible preprocessor mess */
116	if (x & 0xaaaaaaaa) r += 1;	546	/* is to avoid it in all cases, at least on common architectures */
117	if (x & 0xcccccccc) r += 2;	547	/* or when using a recent enough gcc version (>= 4.6) */
118	if (x & 0xf0f0f0f0) r += 4;	548	#if __i386 \|\| __i386__ \|\| _M_X86 \|\| __amd64 \|\| __amd64__ \|\| _M_X64
119	if (x & 0xff00ff00) r += 8;	549	return 0x44;
120	if (x & 0xffff0000) r += 16;	550	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
121		551	return 0x44;
		552	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
		553	return 0x11;
		554	#else
		555	union
		556	{
		557	uint32_t i;
		558	uint8_t c;
		559	} u = { 0x11223344 };
122	return r;	560	return u.c;
		561	#endif
123	}	562	}
124		563
125	ECB_HEADER_INLINE	564	ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
126	ecb_popcount32 (uint32_t x)
127	{
128	x -= (x >> 1) & 0x55555555;
129	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
130	x = ((x >> 4) + x) & 0x0f0f0f0f;
131	x *= 0x01010101;
132
133	return x >> 24;
134	}
135	#endif
136
137	ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
138	#if ECB_GCC_VERSION(4,3)
139	ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) { return __builtin_bswap32 (x); }
140	#else
141	ECB_HEADER_INLINE uint32_t
142	ecb_bswap32 (uint32_t x)
143	{
144	return (x >> 24)
145	\| ((x >> 8) & 0x0000ff00)
146	\| ((x << 8) & 0x00ff0000)
147	\| (x << 24);
148	}
149	#endif
150
151	ECB_HEADER_INLINE void ecb_unreachable (void) ecb_attribute ((noreturn));
152	#if ECB_GCC_VERSION(4,5)
153	ECB_HEADER_INLINE void ecb_unreachable (void) { __builtin_unreachable (); }
154	#else
155	/* this seems to work fine, but gcc always emits a warning for it :/ */
156	ECB_HEADER_INLINE void ecb_unreachable (void) { }
157	#endif
158
159	ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const;
160
161	ECB_HEADER_INLINE unsigned char
162	ecb_byteorder_helper ()
163	{
164	const uint32_t u = 0x11223344;
165	return (unsigned char )&u;
166	}
167
168	ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const;
169	ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; };	565	ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
170	ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const;	566	ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
171	ECB_HEADER_INLINE ecb_bool ecb_little_endian () { return ecb_byteorder_helper () == 0x44; };	567	ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
		568
		569	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
		570	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
		571	#else
		572	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
		573	#endif
		574
		575	#if __cplusplus
		576	template<typename T>
		577	static inline T ecb_div_rd (T val, T div)
		578	{
		579	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
		580	}
		581	template<typename T>
		582	static inline T ecb_div_ru (T val, T div)
		583	{
		584	return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
		585	}
		586	#else
		587	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
		588	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
		589	#endif
172		590
173	#if ecb_cplusplus_does_not_suck	591	#if ecb_cplusplus_does_not_suck
174	// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)	592	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
175	template<typename T, int N>	593	template<typename T, int N>
176	static inline int ecb_array_length (const T (&arr)[N])	594	static inline int ecb_array_length (const T (&arr)[N])
177	{	595	{
178	return N;	596	return N;
179	}	597	}
180	#else	598	#else
181	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	599	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
		600	#endif
		601
		602	/*******************************************************************************/
		603	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
		604
		605	/* basically, everything uses "ieee pure-endian" floating point numbers */
		606	/* the only noteworthy exception is ancient armle, which uses order 43218765 */
		607	#if 0 \
		608	\|\| __i386 \|\| __i386__ \
		609	\|\| __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__ \
		610	\|\| __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__ \
		611	\|\| defined __s390__ \|\| defined __s390x__ \
		612	\|\| defined __mips__ \
		613	\|\| defined __alpha__ \
		614	\|\| defined __hppa__ \
		615	\|\| defined __ia64__ \
		616	\|\| defined __m68k__ \
		617	\|\| defined __m88k__ \
		618	\|\| defined __sh__ \
		619	\|\| defined _M_IX86 \|\| defined _M_AMD64 \|\| defined _M_IA64 \
		620	\|\| (defined __arm__ && (defined __ARM_EABI__ \|\| defined __EABI__ \|\| defined __VFP_FP__ \|\| defined _WIN32_WCE \|\| defined __ANDROID__)) \
		621	\|\| defined __aarch64__
		622	#define ECB_STDFP 1
		623	#include <string.h> /* for memcpy */
		624	#else
		625	#define ECB_STDFP 0
		626	#endif
		627
		628	#ifndef ECB_NO_LIBM
		629
		630	#include <math.h> /* for frexp, ldexp, INFINITY, NAN */
		631
		632	/* only the oldest of old doesn't have this one. solaris. */
		633	#ifdef INFINITY
		634	#define ECB_INFINITY INFINITY
		635	#else
		636	#define ECB_INFINITY HUGE_VAL
182	#endif	637	#endif
183		638
184	ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;	639	#ifdef NAN
185	ECB_INLINE uint32_t	640	#define ECB_NAN NAN
186	ecb_rotr32 (uint32_t x, unsigned int count)	641	#else
187	{	642	#define ECB_NAN ECB_INFINITY
188	return (x << (32 - count)) \| (x >> count);
189	}
190
191	ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
192	ECB_INLINE uint32_t
193	ecb_rotl32 (uint32_t x, unsigned int count)
194	{
195	return (x >> (32 - count)) \| (x << count);
196	}
197
198	#endif	643	#endif
199		644
		645	/* converts an ieee half/binary16 to a float */
		646	ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
		647	ecb_function_ float
		648	ecb_binary16_to_float (uint16_t x)
		649	{
		650	int e = (x >> 10) & 0x1f;
		651	int m = x & 0x3ff;
		652	float r;
		653
		654	if (!e ) r = ldexpf (m , -24);
		655	else if (e != 31) r = ldexpf (m + 0x400, e - 25);
		656	else if (m ) r = ECB_NAN;
		657	else r = ECB_INFINITY;
		658
		659	return x & 0x8000 ? -r : r;
		660	}
		661
		662	/* convert a float to ieee single/binary32 */
		663	ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
		664	ecb_function_ uint32_t
		665	ecb_float_to_binary32 (float x)
		666	{
		667	uint32_t r;
		668
		669	#if ECB_STDFP
		670	memcpy (&r, &x, 4);
		671	#else
		672	/* slow emulation, works for anything but -0 */
		673	uint32_t m;
		674	int e;
		675
		676	if (x == 0e0f ) return 0x00000000U;
		677	if (x > +3.40282346638528860e+38f) return 0x7f800000U;
		678	if (x < -3.40282346638528860e+38f) return 0xff800000U;
		679	if (x != x ) return 0x7fbfffffU;
		680
		681	m = frexpf (x, &e) * 0x1000000U;
		682
		683	r = m & 0x80000000U;
		684
		685	if (r)
		686	m = -m;
		687
		688	if (e <= -126)
		689	{
		690	m &= 0xffffffU;
		691	m >>= (-125 - e);
		692	e = -126;
		693	}
		694
		695	r \|= (e + 126) << 23;
		696	r \|= m & 0x7fffffU;
		697	#endif
		698
		699	return r;
		700	}
		701
		702	/* converts an ieee single/binary32 to a float */
		703	ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
		704	ecb_function_ float
		705	ecb_binary32_to_float (uint32_t x)
		706	{
		707	float r;
		708
		709	#if ECB_STDFP
		710	memcpy (&r, &x, 4);
		711	#else
		712	/* emulation, only works for normals and subnormals and +0 */
		713	int neg = x >> 31;
		714	int e = (x >> 23) & 0xffU;
		715
		716	x &= 0x7fffffU;
		717
		718	if (e)
		719	x \|= 0x800000U;
		720	else
		721	e = 1;
		722
		723	/* we distrust ldexpf a bit and do the 2*-24 scaling by an extra multiply /
		724	r = ldexpf (x * (0.5f / 0x800000U), e - 126);
		725
		726	r = neg ? -r : r;
		727	#endif
		728
		729	return r;
		730	}
		731
		732	/* convert a double to ieee double/binary64 */
		733	ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
		734	ecb_function_ uint64_t
		735	ecb_double_to_binary64 (double x)
		736	{
		737	uint64_t r;
		738
		739	#if ECB_STDFP
		740	memcpy (&r, &x, 8);
		741	#else
		742	/* slow emulation, works for anything but -0 */
		743	uint64_t m;
		744	int e;
		745
		746	if (x == 0e0 ) return 0x0000000000000000U;
		747	if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
		748	if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
		749	if (x != x ) return 0X7ff7ffffffffffffU;
		750
		751	m = frexp (x, &e) * 0x20000000000000U;
		752
		753	r = m & 0x8000000000000000;;
		754
		755	if (r)
		756	m = -m;
		757
		758	if (e <= -1022)
		759	{
		760	m &= 0x1fffffffffffffU;
		761	m >>= (-1021 - e);
		762	e = -1022;
		763	}
		764
		765	r \|= ((uint64_t)(e + 1022)) << 52;
		766	r \|= m & 0xfffffffffffffU;
		767	#endif
		768
		769	return r;
		770	}
		771
		772	/* converts an ieee double/binary64 to a double */
		773	ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
		774	ecb_function_ double
		775	ecb_binary64_to_double (uint64_t x)
		776	{
		777	double r;
		778
		779	#if ECB_STDFP
		780	memcpy (&r, &x, 8);
		781	#else
		782	/* emulation, only works for normals and subnormals and +0 */
		783	int neg = x >> 63;
		784	int e = (x >> 52) & 0x7ffU;
		785
		786	x &= 0xfffffffffffffU;
		787
		788	if (e)
		789	x \|= 0x10000000000000U;
		790	else
		791	e = 1;
		792
		793	/* we distrust ldexp a bit and do the 2*-53 scaling by an extra multiply /
		794	r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
		795
		796	r = neg ? -r : r;
		797	#endif
		798
		799	return r;
		800	}
		801
		802	#endif
		803
		804	#endif
		805

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Comparing libecb/ecb.h (file contents): Revision 1.14 by root, Thu May 26 18:26:59 2011 UTC vs. Revision 1.134 by root, Mon Jun 9 17:31:57 2014 UTC

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Comparing libecb/ecb.h (file contents):
Revision 1.14 by root, Thu May 26 18:26:59 2011 UTC vs.
Revision 1.134 by root, Mon Jun 9 17:31:57 2014 UTC