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

Comparing libecb/ecb.h (file contents):
Revision 1.23 by root, Thu May 26 19:40:09 2011 UTC vs.
Revision 1.137 by root, Tue Oct 14 14:01:07 2014 UTC

…		…
1	/*	1	/*
2	* libecb - http://software.schmorp.de/pkg/libecb	2	* libecb - http://software.schmorp.de/pkg/libecb
3	*	3	*
4	* Copyright (©) 2009-2011 Marc Alexander Lehmann	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 in return for some better fake benchmark numbers.	90	* causing enormous grief in return for some better fake benchmark numbers.
38	* or so.	91	* or so.
39	* 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
40	* 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.
41	*/	94	*/
42	#ifndef ECB_GCC_VERSION	95	#if !defined __GNUC_MINOR__ \|\| defined __INTEL_COMPILER \|\| defined __SUNPRO_C \|\| defined __SUNPRO_CC \|\| defined __llvm__ \|\| defined __clang__
43	# if defined(__INTEL_COMPILER) \|\| defined(__SUNPRO_C) \|\| defined(__llvm__)
44	# define ECB_GCC_VERSION(major,minor) 0	96	#define ECB_GCC_VERSION(major,minor) 0
45	# else	97	#else
46	# 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)))
47	# endif	99	#endif
48	#endif
49		100
50	#ifndef __cplusplus	101	#define ECB_CPP (__cplusplus+0)
51	# if __STDC_VERSION__ >= 199901L	102	#define ECB_CPP11 (__cplusplus >= 201103L)
52	# define ECB_INLINE inline	103
53	typedef _Bool ecb_bool;	104	#if ECB_CPP
		105	#define ECB_C 0
		106	#define ECB_STDC_VERSION 0
54	# else	107	#else
55	# define ECB_INLINE inline /* yeah! */	108	#define ECB_C 1
		109	#define ECB_STDC_VERSION __STDC_VERSION__
		110	#endif
		111
		112	#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
		113	#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
		114
		115	#if ECB_CPP
		116	#define ECB_EXTERN_C extern "C"
		117	#define ECB_EXTERN_C_BEG ECB_EXTERN_C {
		118	#define ECB_EXTERN_C_END }
		119	#else
		120	#define ECB_EXTERN_C extern
		121	#define ECB_EXTERN_C_BEG
		122	#define ECB_EXTERN_C_END
		123	#endif
		124
		125	/*****************************************************************************/
		126
		127	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
		128	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
		129
		130	#if ECB_NO_THREADS
		131	#define ECB_NO_SMP 1
		132	#endif
		133
		134	#if ECB_NO_SMP
		135	#define ECB_MEMORY_FENCE do { } while (0)
		136	#endif
		137
		138	#ifndef ECB_MEMORY_FENCE
		139	#if ECB_GCC_VERSION(2,5) \|\| defined __INTEL_COMPILER \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		140	#if __i386 \|\| __i386__
		141	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
		142	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
		143	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		144	#elif __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__
		145	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
		146	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
		147	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		148	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__
		149	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		150	#elif defined __ARM_ARCH_6__ \|\| defined __ARM_ARCH_6J__ \
		151	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__
		152	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
		153	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \
		154	\|\| defined __ARM_ARCH_7M__ \|\| defined __ARM_ARCH_7R__
		155	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
		156	#elif __aarch64__
		157	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
		158	#elif (__sparc \|\| __sparc__) && !__sparcv8
		159	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad" : : : "memory")
		160	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
		161	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
		162	#elif defined __s390__ \|\| defined __s390x__
		163	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
		164	#elif defined __mips__
		165	/* GNU/Linux emulates sync on mips1 architectures, so we force its use */
		166	/* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
		167	#define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
		168	#elif defined __alpha__
		169	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
		170	#elif defined __hppa__
		171	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		172	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		173	#elif defined __ia64__
		174	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
		175	#elif defined __m68k__
		176	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		177	#elif defined __m88k__
		178	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
		179	#elif defined __sh__
		180	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		181	#endif
		182	#endif
		183	#endif
		184
		185	#ifndef ECB_MEMORY_FENCE
		186	#if ECB_GCC_VERSION(4,7)
		187	/* see comment below (stdatomic.h) about the C11 memory model. */
		188	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
		189	#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
		190	#define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
		191
		192	/* The __has_feature syntax from clang is so misdesigned that we cannot use it
		193	* without risking compile time errors with other compilers. We could
		194	* define our own ecb_clang_has_feature, but I just can't be bothered to work
		195	* around this shit time and again.
		196	* #elif defined __clang && __has_feature (cxx_atomic)
		197	* // see comment below (stdatomic.h) about the C11 memory model.
		198	* #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
		199	* #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
		200	* #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
		201	*/
		202
		203	#elif ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__
		204	#define ECB_MEMORY_FENCE __sync_synchronize ()
		205	#elif _MSC_VER >= 1500 /* VC++ 2008 */
		206	/* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
		207	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		208	#define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
		209	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
		210	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
		211	#elif _MSC_VER >= 1400 /* VC++ 2005 */
		212	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		213	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
		214	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
		215	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
		216	#elif defined _WIN32
		217	#include <WinNT.h>
		218	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
		219	#elif __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		220	#include <mbarrier.h>
		221	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
		222	#define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
		223	#define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
		224	#elif __xlC__
		225	#define ECB_MEMORY_FENCE __sync ()
		226	#endif
		227	#endif
		228
		229	#ifndef ECB_MEMORY_FENCE
		230	#if ECB_C11 && !defined __STDC_NO_ATOMICS__
		231	/* we assume that these memory fences work on all variables/all memory accesses, */
		232	/* not just C11 atomics and atomic accesses */
		233	#include <stdatomic.h>
		234	/* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
		235	/* any fence other than seq_cst, which isn't very efficient for us. */
		236	/* Why that is, we don't know - either the C11 memory model is quite useless */
		237	/* for most usages, or gcc and clang have a bug */
		238	/* I currently lean towards the latter, and inefficiently implement */
		239	/* all three of ecb's fences as a seq_cst fence */
		240	/* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
		241	/* for all __atomic_thread_fence's except seq_cst */
		242	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
		243	#endif
		244	#endif
		245
		246	#ifndef ECB_MEMORY_FENCE
		247	#if !ECB_AVOID_PTHREADS
		248	/*
		249	* if you get undefined symbol references to pthread_mutex_lock,
		250	* or failure to find pthread.h, then you should implement
		251	* the ECB_MEMORY_FENCE operations for your cpu/compiler
		252	* OR provide pthread.h and link against the posix thread library
		253	* of your system.
		254	*/
		255	#include <pthread.h>
		256	#define ECB_NEEDS_PTHREADS 1
		257	#define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
		258
		259	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
		260	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
		261	#endif
		262	#endif
		263
		264	#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
		265	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
		266	#endif
		267
		268	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
		269	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
		270	#endif
		271
		272	/*****************************************************************************/
		273
		274	#if __cplusplus
		275	#define ecb_inline static inline
		276	#elif ECB_GCC_VERSION(2,5)
		277	#define ecb_inline static __inline__
		278	#elif ECB_C99
		279	#define ecb_inline static inline
		280	#else
		281	#define ecb_inline static
		282	#endif
		283
		284	#if ECB_GCC_VERSION(3,3)
		285	#define ecb_restrict __restrict__
		286	#elif ECB_C99
		287	#define ecb_restrict restrict
		288	#else
		289	#define ecb_restrict
		290	#endif
		291
56	typedef int ecb_bool;	292	typedef int ecb_bool;
57	# endif
58	#endif
59		293
60	#define ECB_CONCAT_(a, b) a ## b	294	#define ECB_CONCAT_(a, b) a ## b
61	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	295	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
62	#define ECB_STRINGIFY_(a) # a	296	#define ECB_STRINGIFY_(a) # a
63	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)	297	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
64		298
65	#define ECB_HEADER_INLINE static ECB_INLINE	299	#define ecb_function_ ecb_inline
66		300
67	#if ECB_GCC_VERSION(3,1)	301	#if ECB_GCC_VERSION(3,1)
68	# define ecb_attribute(attrlist) __attribute__(attrlist)	302	#define ecb_attribute(attrlist) __attribute__(attrlist)
69	# define ecb_is_constant(expr) __builtin_constant_p (expr)	303	#define ecb_is_constant(expr) __builtin_constant_p (expr)
70	# define ecb_expect(expr,value) __builtin_expect ((expr),(value))	304	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
71	# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)	305	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
72	#else	306	#else
73	# define ecb_attribute(attrlist)	307	#define ecb_attribute(attrlist)
		308
		309	/* possible C11 impl for integral types
		310	typedef struct ecb_is_constant_struct ecb_is_constant_struct;
		311	#define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct )0 : (void )((expr) - (expr)), ecb_is_constant_struct : 0, default: 1)) /
		312
74	# define ecb_is_constant(expr) 0	313	#define ecb_is_constant(expr) 0
75	# define ecb_expect(expr,value) (expr)	314	#define ecb_expect(expr,value) (expr)
76	# define ecb_prefetch(addr,rw,locality)	315	#define ecb_prefetch(addr,rw,locality)
77	#endif	316	#endif
78		317
79	/* no emulation for ecb_decltype */	318	/* no emulation for ecb_decltype */
80	#if ECB_GCC_VERSION(4,5)	319	#if ECB_GCC_VERSION(4,5)
81	# define ecb_decltype(x) __decltype(x)	320	#define ecb_decltype(x) __decltype(x)
82	#elif ECB_GCC_VERSION(3,0)	321	#elif ECB_GCC_VERSION(3,0)
83	# define ecb_decltype(x) typeof(x)	322	#define ecb_decltype(x) __typeof(x)
84	#endif	323	#endif
85		324
		325	#if _MSC_VER >= 1300
		326	#define ecb_deprecated __declspec(deprecated)
		327	#else
		328	#define ecb_deprecated ecb_attribute ((__deprecated__))
		329	#endif
		330
86	#define ecb_noinline ecb_attribute ((noinline))	331	#define ecb_noinline ecb_attribute ((__noinline__))
87	#define ecb_noreturn ecb_attribute ((noreturn))
88	#define ecb_unused ecb_attribute ((unused))	332	#define ecb_unused ecb_attribute ((__unused__))
89	#define ecb_const ecb_attribute ((const))	333	#define ecb_const ecb_attribute ((__const__))
90	#define ecb_pure ecb_attribute ((pure))	334	#define ecb_pure ecb_attribute ((__pure__))
		335
		336	/* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx __declspec(noreturn) */
		337	#if ECB_C11
		338	#define ecb_noreturn _Noreturn
		339	#else
		340	#define ecb_noreturn ecb_attribute ((__noreturn__))
		341	#endif
		342
		343	#if ECB_GCC_VERSION(4,3)
		344	#define ecb_artificial ecb_attribute ((__artificial__))
91	#define ecb_hot ecb_attribute ((hot)) /* 4.3 */	345	#define ecb_hot ecb_attribute ((__hot__))
92	#define ecb_cold ecb_attribute ((cold)) /* 4.3 */	346	#define ecb_cold ecb_attribute ((__cold__))
		347	#else
		348	#define ecb_artificial
		349	#define ecb_hot
		350	#define ecb_cold
		351	#endif
93		352
94	/* put into if's if you are very sure that the expression */	353	/* put around conditional expressions if you are very sure that the */
95	/* is mostly true or mosty false. note that these return */	354	/* expression is mostly true or mostly false. note that these return */
96	/* booleans, not the expression. */	355	/* booleans, not the expression. */
97	#define ecb_unlikely(expr) ecb_expect (!!(expr), 0)	356	#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
		357	#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
		358	/* for compatibility to the rest of the world */
98	#define ecb_likely(expr) ecb_expect (!!(expr), 1)	359	#define ecb_likely(expr) ecb_expect_true (expr)
99		360	#define ecb_unlikely(expr) ecb_expect_false (expr)
100	/* try to tell the compiler that some condition is definitely true */
101	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
102		361
103	/* count trailing zero bits and count # of one bits */	362	/* count trailing zero bits and count # of one bits */
104	#if ECB_GCC_VERSION(3,4)	363	#if ECB_GCC_VERSION(3,4)
		364	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
		365	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
		366	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
105	#define ecb_ctz32 (x) __builtin_ctz (x)	367	#define ecb_ctz32(x) __builtin_ctz (x)
		368	#define ecb_ctz64(x) __builtin_ctzll (x)
106	#define ecb_popcount32 (x) __builtin_popcount (x)	369	#define ecb_popcount32(x) __builtin_popcount (x)
		370	/* no popcountll */
107	#else	371	#else
108	ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;	372	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
109	ECB_HEADER_INLINE	373	ecb_function_ int
110	ecb_ctz32 (uint32_t x)	374	ecb_ctz32 (uint32_t x)
		375	{
		376	int r = 0;
		377
		378	x &= ~x + 1; /* this isolates the lowest bit */
		379
		380	#if ECB_branchless_on_i386
		381	r += !!(x & 0xaaaaaaaa) << 0;
		382	r += !!(x & 0xcccccccc) << 1;
		383	r += !!(x & 0xf0f0f0f0) << 2;
		384	r += !!(x & 0xff00ff00) << 3;
		385	r += !!(x & 0xffff0000) << 4;
		386	#else
		387	if (x & 0xaaaaaaaa) r += 1;
		388	if (x & 0xcccccccc) r += 2;
		389	if (x & 0xf0f0f0f0) r += 4;
		390	if (x & 0xff00ff00) r += 8;
		391	if (x & 0xffff0000) r += 16;
		392	#endif
		393
		394	return r;
		395	}
		396
		397	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
		398	ecb_function_ int
		399	ecb_ctz64 (uint64_t x)
		400	{
		401	int shift = x & 0xffffffffU ? 0 : 32;
		402	return ecb_ctz32 (x >> shift) + shift;
		403	}
		404
		405	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
		406	ecb_function_ int
		407	ecb_popcount32 (uint32_t x)
		408	{
		409	x -= (x >> 1) & 0x55555555;
		410	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
		411	x = ((x >> 4) + x) & 0x0f0f0f0f;
		412	x *= 0x01010101;
		413
		414	return x >> 24;
		415	}
		416
		417	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
		418	ecb_function_ int ecb_ld32 (uint32_t x)
		419	{
		420	int r = 0;
		421
		422	if (x >> 16) { x >>= 16; r += 16; }
		423	if (x >> 8) { x >>= 8; r += 8; }
		424	if (x >> 4) { x >>= 4; r += 4; }
		425	if (x >> 2) { x >>= 2; r += 2; }
		426	if (x >> 1) { r += 1; }
		427
		428	return r;
		429	}
		430
		431	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
		432	ecb_function_ int ecb_ld64 (uint64_t x)
		433	{
		434	int r = 0;
		435
		436	if (x >> 32) { x >>= 32; r += 32; }
		437
		438	return r + ecb_ld32 (x);
		439	}
		440	#endif
		441
		442	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
		443	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
		444	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
		445	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
		446
		447	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
		448	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
111	{	449	{
112	int r = 0;	450	return ( (x * 0x0802U & 0x22110U)
113		451	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
114	x &= -x; /* this isolates the lowest bit */
115
116	if (x & 0xaaaaaaaa) r += 1;
117	if (x & 0xcccccccc) r += 2;
118	if (x & 0xf0f0f0f0) r += 4;
119	if (x & 0xff00ff00) r += 8;
120	if (x & 0xffff0000) r += 16;
121
122	return r;
123	}	452	}
124		453
125	ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;	454	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
126	ECB_HEADER_INLINE	455	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
127	ecb_popcount32 (uint32_t x)
128	{	456	{
129	x -= (x >> 1) & 0x55555555;	457	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);
130	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);	458	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);
131	x = ((x >> 4) + x) & 0x0f0f0f0f;	459	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);
132	x *= 0x01010101;	460	x = ( x >> 8 ) \| ( x << 8);
133		461
134	return x >> 24;	462	return x;
135	}	463	}
136	#endif	464
		465	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
		466	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
		467	{
		468	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);
		469	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);
		470	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);
		471	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);
		472	x = ( x >> 16 ) \| ( x << 16);
		473
		474	return x;
		475	}
		476
		477	/* popcount64 is only available on 64 bit cpus as gcc builtin */
		478	/* so for this version we are lazy */
		479	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
		480	ecb_function_ int
		481	ecb_popcount64 (uint64_t x)
		482	{
		483	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
		484	}
		485
		486	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
		487	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
		488	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
		489	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
		490	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
		491	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
		492	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
		493	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
		494
		495	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }
		496	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }
		497	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }
		498	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }
		499	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }
		500	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }
		501	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }
		502	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }
137		503
138	#if ECB_GCC_VERSION(4,3)	504	#if ECB_GCC_VERSION(4,3)
139	# define ecb_bswap32(x) __builtin_bswap32 (x)
140	# define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)	505	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
		506	#define ecb_bswap32(x) __builtin_bswap32 (x)
		507	#define ecb_bswap64(x) __builtin_bswap64 (x)
141	#else	508	#else
		509	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
		510	ecb_function_ uint16_t
		511	ecb_bswap16 (uint16_t x)
		512	{
		513	return ecb_rotl16 (x, 8);
		514	}
		515
142	ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;	516	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
143	ECB_HEADER_INLINE uint32_t	517	ecb_function_ uint32_t
144	ecb_bswap32 (uint32_t x)	518	ecb_bswap32 (uint32_t x)
145	{	519	{
146	return (x >> 24)	520	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);
147	\| ((x >> 8) & 0x0000ff00)	521	}
148	\| ((x << 8) & 0x00ff0000)
149	\| (x << 24);
150	}
151		522
152	ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const;	523	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
153	ECB_HEADER_INLINE uint32_t	524	ecb_function_ uint64_t
154	ecb_bswap16 (uint32_t x)	525	ecb_bswap64 (uint64_t x)
155	{	526	{
156	return ((x >> 8) & 0xff)	527	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);
157	\| ((x << 8) & 0x00ff0000)	528	}
158	\| (x << 24);
159	}
160	#endif	529	#endif
161		530
162	#if ECB_GCC_VERSION(4,5)	531	#if ECB_GCC_VERSION(4,5)
163	# define ecb_unreachable() __builtin_unreachable ()	532	#define ecb_unreachable() __builtin_unreachable ()
164	#else	533	#else
165	/* this seems to work fine, but gcc always emits a warning for it :/ */	534	/* this seems to work fine, but gcc always emits a warning for it :/ */
166	ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;	535	ecb_inline void ecb_unreachable (void) ecb_noreturn;
167	ECB_HEADER_INLINE void ecb_unreachable (void) { }	536	ecb_inline void ecb_unreachable (void) { }
168	#endif	537	#endif
169		538
		539	/* try to tell the compiler that some condition is definitely true */
		540	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
		541
170	ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;	542	ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
171	ECB_HEADER_INLINE unsigned char	543	ecb_inline unsigned char
172	ecb_byteorder_helper (void)	544	ecb_byteorder_helper (void)
173	{	545	{
174	const uint32_t u = 0x11223344;	546	/* the union code still generates code under pressure in gcc, */
175	return (unsigned char )&u;	547	/* but less than using pointers, and always seems to */
		548	/* successfully return a constant. */
		549	/* the reason why we have this horrible preprocessor mess */
		550	/* is to avoid it in all cases, at least on common architectures */
		551	/* or when using a recent enough gcc version (>= 4.6) */
		552	#if __i386 \|\| __i386__ \|\| _M_X86 \|\| __amd64 \|\| __amd64__ \|\| _M_X64
		553	return 0x44;
		554	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
		555	return 0x44;
		556	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
		557	return 0x11;
		558	#else
		559	union
		560	{
		561	uint32_t i;
		562	uint8_t c;
		563	} u = { 0x11223344 };
		564	return u.c;
		565	#endif
176	}	566	}
177		567
178	ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;	568	ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
179	ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; };	569	ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
180	ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const;	570	ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
181	ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; };	571	ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
182		572
		573	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
		574	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
		575	#else
183	#define ecb_mod(m, n) ((m) < 0 ? ((n) - (-(m) % (n))) : ((m) % (n)))	576	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
		577	#endif
		578
		579	#if __cplusplus
		580	template<typename T>
		581	static inline T ecb_div_rd (T val, T div)
		582	{
		583	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
		584	}
		585	template<typename T>
		586	static inline T ecb_div_ru (T val, T div)
		587	{
		588	return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
		589	}
		590	#else
		591	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
		592	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
		593	#endif
184		594
185	#if ecb_cplusplus_does_not_suck	595	#if ecb_cplusplus_does_not_suck
186	// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)	596	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
187	template<typename T, int N>	597	template<typename T, int N>
188	static inline int ecb_array_length (const T (&arr)[N])	598	static inline int ecb_array_length (const T (&arr)[N])
189	{	599	{
190	return N;	600	return N;
191	}	601	}
192	#else	602	#else
193	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	603	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
		604	#endif
		605
		606	/*******************************************************************************/
		607	/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
		608
		609	/* basically, everything uses "ieee pure-endian" floating point numbers */
		610	/* the only noteworthy exception is ancient armle, which uses order 43218765 */
		611	#if 0 \
		612	\|\| __i386 \|\| __i386__ \
		613	\|\| __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__ \
		614	\|\| __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__ \
		615	\|\| defined __s390__ \|\| defined __s390x__ \
		616	\|\| defined __mips__ \
		617	\|\| defined __alpha__ \
		618	\|\| defined __hppa__ \
		619	\|\| defined __ia64__ \
		620	\|\| defined __m68k__ \
		621	\|\| defined __m88k__ \
		622	\|\| defined __sh__ \
		623	\|\| defined _M_IX86 \|\| defined _M_AMD64 \|\| defined _M_IA64 \
		624	\|\| (defined __arm__ && (defined __ARM_EABI__ \|\| defined __EABI__ \|\| defined __VFP_FP__ \|\| defined _WIN32_WCE \|\| defined __ANDROID__)) \
		625	\|\| defined __aarch64__
		626	#define ECB_STDFP 1
		627	#include <string.h> /* for memcpy */
		628	#else
		629	#define ECB_STDFP 0
		630	#endif
		631
		632	#ifndef ECB_NO_LIBM
		633
		634	#include <math.h> /* for frexp, ldexp, INFINITY, NAN */
		635
		636	/* only the oldest of old doesn't have this one. solaris. */
		637	#ifdef INFINITY
		638	#define ECB_INFINITY INFINITY
		639	#else
		640	#define ECB_INFINITY HUGE_VAL
194	#endif	641	#endif
195		642
196	ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;	643	#ifdef NAN
197	ECB_INLINE uint32_t	644	#define ECB_NAN NAN
198	ecb_rotr32 (uint32_t x, unsigned int count)	645	#else
199	{	646	#define ECB_NAN ECB_INFINITY
200	return (x << (32 - count)) \| (x >> count);
201	}
202
203	ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
204	ECB_INLINE uint32_t
205	ecb_rotl32 (uint32_t x, unsigned int count)
206	{
207	return (x >> (32 - count)) \| (x << count);
208	}
209
210	#endif	647	#endif
211		648
		649	/* converts an ieee half/binary16 to a float */
		650	ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
		651	ecb_function_ float
		652	ecb_binary16_to_float (uint16_t x)
		653	{
		654	int e = (x >> 10) & 0x1f;
		655	int m = x & 0x3ff;
		656	float r;
		657
		658	if (!e ) r = ldexpf (m , -24);
		659	else if (e != 31) r = ldexpf (m + 0x400, e - 25);
		660	else if (m ) r = ECB_NAN;
		661	else r = ECB_INFINITY;
		662
		663	return x & 0x8000 ? -r : r;
		664	}
		665
		666	/* convert a float to ieee single/binary32 */
		667	ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
		668	ecb_function_ uint32_t
		669	ecb_float_to_binary32 (float x)
		670	{
		671	uint32_t r;
		672
		673	#if ECB_STDFP
		674	memcpy (&r, &x, 4);
		675	#else
		676	/* slow emulation, works for anything but -0 */
		677	uint32_t m;
		678	int e;
		679
		680	if (x == 0e0f ) return 0x00000000U;
		681	if (x > +3.40282346638528860e+38f) return 0x7f800000U;
		682	if (x < -3.40282346638528860e+38f) return 0xff800000U;
		683	if (x != x ) return 0x7fbfffffU;
		684
		685	m = frexpf (x, &e) * 0x1000000U;
		686
		687	r = m & 0x80000000U;
		688
		689	if (r)
		690	m = -m;
		691
		692	if (e <= -126)
		693	{
		694	m &= 0xffffffU;
		695	m >>= (-125 - e);
		696	e = -126;
		697	}
		698
		699	r \|= (e + 126) << 23;
		700	r \|= m & 0x7fffffU;
		701	#endif
		702
		703	return r;
		704	}
		705
		706	/* converts an ieee single/binary32 to a float */
		707	ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
		708	ecb_function_ float
		709	ecb_binary32_to_float (uint32_t x)
		710	{
		711	float r;
		712
		713	#if ECB_STDFP
		714	memcpy (&r, &x, 4);
		715	#else
		716	/* emulation, only works for normals and subnormals and +0 */
		717	int neg = x >> 31;
		718	int e = (x >> 23) & 0xffU;
		719
		720	x &= 0x7fffffU;
		721
		722	if (e)
		723	x \|= 0x800000U;
		724	else
		725	e = 1;
		726
		727	/* we distrust ldexpf a bit and do the 2*-24 scaling by an extra multiply /
		728	r = ldexpf (x * (0.5f / 0x800000U), e - 126);
		729
		730	r = neg ? -r : r;
		731	#endif
		732
		733	return r;
		734	}
		735
		736	/* convert a double to ieee double/binary64 */
		737	ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
		738	ecb_function_ uint64_t
		739	ecb_double_to_binary64 (double x)
		740	{
		741	uint64_t r;
		742
		743	#if ECB_STDFP
		744	memcpy (&r, &x, 8);
		745	#else
		746	/* slow emulation, works for anything but -0 */
		747	uint64_t m;
		748	int e;
		749
		750	if (x == 0e0 ) return 0x0000000000000000U;
		751	if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
		752	if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
		753	if (x != x ) return 0X7ff7ffffffffffffU;
		754
		755	m = frexp (x, &e) * 0x20000000000000U;
		756
		757	r = m & 0x8000000000000000;;
		758
		759	if (r)
		760	m = -m;
		761
		762	if (e <= -1022)
		763	{
		764	m &= 0x1fffffffffffffU;
		765	m >>= (-1021 - e);
		766	e = -1022;
		767	}
		768
		769	r \|= ((uint64_t)(e + 1022)) << 52;
		770	r \|= m & 0xfffffffffffffU;
		771	#endif
		772
		773	return r;
		774	}
		775
		776	/* converts an ieee double/binary64 to a double */
		777	ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
		778	ecb_function_ double
		779	ecb_binary64_to_double (uint64_t x)
		780	{
		781	double r;
		782
		783	#if ECB_STDFP
		784	memcpy (&r, &x, 8);
		785	#else
		786	/* emulation, only works for normals and subnormals and +0 */
		787	int neg = x >> 63;
		788	int e = (x >> 52) & 0x7ffU;
		789
		790	x &= 0xfffffffffffffU;
		791
		792	if (e)
		793	x \|= 0x10000000000000U;
		794	else
		795	e = 1;
		796
		797	/* we distrust ldexp a bit and do the 2*-53 scaling by an extra multiply /
		798	r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
		799
		800	r = neg ? -r : r;
		801	#endif
		802
		803	return r;
		804	}
		805
		806	#endif
		807
		808	#endif
		809

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Comparing libecb/ecb.h (file contents): Revision 1.23 by root, Thu May 26 19:40:09 2011 UTC vs. Revision 1.137 by root, Tue Oct 14 14:01:07 2014 UTC

Diff Legend

Comparing libecb/ecb.h (file contents):
Revision 1.23 by root, Thu May 26 19:40:09 2011 UTC vs.
Revision 1.137 by root, Tue Oct 14 14:01:07 2014 UTC