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

Comparing libecb/ecb.h (file contents):
Revision 1.34 by root, Fri Jun 10 12:20:14 2011 UTC vs.
Revision 1.82 by root, Fri Mar 23 19:05:22 2012 UTC

…		…
1	/*	1	/*
2	* libecb - http://software.schmorp.de/pkg/libecb	2	* libecb - http://software.schmorp.de/pkg/libecb
3	*	3	*
4	* Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de>	4	* Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
5	* Copyright (©) 2011 Emanuele Giaquinta	5	* Copyright (©) 2011 Emanuele Giaquinta
6	* All rights reserved.	6	* All rights reserved.
7	*	7	*
8	* Redistribution and use in source and binary forms, with or without modifica-	8	* Redistribution and use in source and binary forms, with or without modifica-
9	* tion, are permitted provided that the following conditions are met:	9	* tion, are permitted provided that the following conditions are met:
28	*/	28	*/
29		29
30	#ifndef ECB_H	30	#ifndef ECB_H
31	#define ECB_H	31	#define ECB_H
32		32
		33	#ifdef _WIN32
		34	typedef signed char int8_t;
		35	typedef unsigned char uint8_t;
		36	typedef signed short int16_t;
		37	typedef unsigned short uint16_t;
		38	typedef signed int int32_t;
		39	typedef unsigned int uint32_t;
		40	#if __GNUC__
		41	typedef signed long long int64_t;
		42	typedef unsigned long long uint64_t;
		43	#else /* _MSC_VER \|\| __BORLANDC__ */
		44	typedef signed __int64 int64_t;
		45	typedef unsigned __int64 uint64_t;
		46	#endif
		47	#else
33	#include <inttypes.h>	48	#include <inttypes.h>
		49	#endif
34		50
35	/* many compilers define _GNUC_ to some versions but then only implement	51	/* many compilers define _GNUC_ to some versions but then only implement
36	* what their idiot authors think are the "more important" extensions,	52	* what their idiot authors think are the "more important" extensions,
37	* causing enourmous grief in return for some better fake benchmark numbers.	53	* causing enormous grief in return for some better fake benchmark numbers.
38	* or so.	54	* or so.
39	* we try to detect these and simply assume they are not gcc - if they have	55	* 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.	56	* an issue with that they should have done it right in the first place.
41	*/	57	*/
42	#ifndef ECB_GCC_VERSION	58	#ifndef ECB_GCC_VERSION
43	# if defined(__INTEL_COMPILER) \|\| defined(__SUNPRO_C) \|\| defined(__llvm__)	59	#if !defined(__GNUC_MINOR__) \|\| defined(__INTEL_COMPILER) \|\| defined(__SUNPRO_C) \|\| defined(__SUNPRO_CC) \|\| defined(__llvm__) \|\| defined(__clang__)
44	# define ECB_GCC_VERSION(major,minor) 0	60	#define ECB_GCC_VERSION(major,minor) 0
45	# else	61	#else
46	# define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))	62	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
		63	#endif
47	# endif	64	#endif
		65
		66	/*****************************************************************************/
		67
		68	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
		69	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
		70
		71	#if ECB_NO_THREADS
		72	# define ECB_NO_SMP 1
		73	#endif
		74
		75	#if ECB_NO_THREADS \|\| ECB_NO_SMP
		76	#define ECB_MEMORY_FENCE do { } while (0)
		77	#endif
		78
		79	#ifndef ECB_MEMORY_FENCE
		80	#if ECB_GCC_VERSION(2,5) \|\| defined(__INTEL_COMPILER) \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		81	#if __i386 \|\| __i386__
		82	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
		83	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
		84	#define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
		85	#elif __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__
		86	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
		87	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
		88	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
		89	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__
		90	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		91	#elif defined(__ARM_ARCH_6__ ) \|\| defined(__ARM_ARCH_6J__ ) \
		92	\|\| defined(__ARM_ARCH_6K__) \|\| defined(__ARM_ARCH_6ZK__)
		93	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
		94	#elif defined(__ARM_ARCH_7__ ) \|\| defined(__ARM_ARCH_7A__ ) \
		95	\|\| defined(__ARM_ARCH_7M__) \|\| defined(__ARM_ARCH_7R__ )
		96	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
		97	#elif __sparc \|\| __sparc__
		98	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad \| " : : : "memory")
		99	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
		100	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
		101	#elif defined(__s390__) \|\| defined(__s390x__)
		102	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
		103	#elif defined(__mips__)
		104	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		105	#endif
48	#endif	106	#endif
		107	#endif
49		108
		109	#ifndef ECB_MEMORY_FENCE
		110	#if ECB_GCC_VERSION(4,4) \|\| defined(__INTEL_COMPILER) \|\| defined(__clang__)
		111	#define ECB_MEMORY_FENCE __sync_synchronize ()
		112	/#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) /
		113	/#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) /
		114	#elif _MSC_VER >= 1400 /* VC++ 2005 */
		115	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		116	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
		117	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
		118	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
		119	#elif defined(_WIN32)
		120	#include <WinNT.h>
		121	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
		122	#elif __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		123	#include <mbarrier.h>
		124	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
		125	#define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
		126	#define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
		127	#elif __xlC__
		128	#define ECB_MEMORY_FENCE __lwsync ()
		129	#endif
		130	#endif
		131
		132	#ifndef ECB_MEMORY_FENCE
		133	#if !ECB_AVOID_PTHREADS
		134	/*
		135	* if you get undefined symbol references to pthread_mutex_lock,
		136	* or failure to find pthread.h, then you should implement
		137	* the ECB_MEMORY_FENCE operations for your cpu/compiler
		138	* OR provide pthread.h and link against the posix thread library
		139	* of your system.
		140	*/
		141	#include <pthread.h>
		142	#define ECB_NEEDS_PTHREADS 1
		143	#define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
		144
		145	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
		146	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
		147	#endif
		148	#endif
		149
		150	#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
		151	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
		152	#endif
		153
		154	#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
		155	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
		156	#endif
		157
		158	/*****************************************************************************/
		159
		160	#define ECB_C99 (__STDC_VERSION__ >= 199901L)
		161
50	#ifndef __cplusplus	162	#if __cplusplus
51	# if __STDC_VERSION__ >= 199901L	163	#define ecb_inline static inline
52	# define ECB_INLINE static inline	164	#elif ECB_GCC_VERSION(2,5)
53	typedef _Bool ecb_bool;	165	#define ecb_inline static __inline__
		166	#elif ECB_C99
		167	#define ecb_inline static inline
54	# else	168	#else
55	# define ECB_INLINE static inline /* yeah! */	169	#define ecb_inline static
		170	#endif
		171
		172	#if ECB_GCC_VERSION(3,3)
		173	#define ecb_restrict __restrict__
		174	#elif ECB_C99
		175	#define ecb_restrict restrict
		176	#else
		177	#define ecb_restrict
		178	#endif
		179
56	typedef int ecb_bool;	180	typedef int ecb_bool;
57	# endif
58	#else
59	# define ECB_INLINE static inline
60	typedef bool ecb_bool;
61	#endif
62		181
63	#define ECB_CONCAT_(a, b) a ## b	182	#define ECB_CONCAT_(a, b) a ## b
64	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	183	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
65	#define ECB_STRINGIFY_(a) # a	184	#define ECB_STRINGIFY_(a) # a
66	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)	185	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
67		186
68	#define ECB_HEADER_INLINE ECB_INLINE	187	#define ecb_function_ ecb_inline
69		188
70	#if ECB_GCC_VERSION(3,1)	189	#if ECB_GCC_VERSION(3,1)
71	# define ecb_attribute(attrlist) __attribute__(attrlist)	190	#define ecb_attribute(attrlist) __attribute__(attrlist)
72	# define ecb_is_constant(expr) __builtin_constant_p (expr)	191	#define ecb_is_constant(expr) __builtin_constant_p (expr)
73	# define ecb_expect(expr,value) __builtin_expect ((expr),(value))	192	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
74	# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)	193	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
75	#else	194	#else
76	# define ecb_attribute(attrlist)	195	#define ecb_attribute(attrlist)
77	# define ecb_is_constant(expr) 0	196	#define ecb_is_constant(expr) 0
78	# define ecb_expect(expr,value) (expr)	197	#define ecb_expect(expr,value) (expr)
79	# define ecb_prefetch(addr,rw,locality)	198	#define ecb_prefetch(addr,rw,locality)
80	#endif	199	#endif
81		200
82	/* no emulation for ecb_decltype */	201	/* no emulation for ecb_decltype */
83	#if ECB_GCC_VERSION(4,5)	202	#if ECB_GCC_VERSION(4,5)
84	# define ecb_decltype(x) __decltype(x)	203	#define ecb_decltype(x) __decltype(x)
85	#elif ECB_GCC_VERSION(3,0)	204	#elif ECB_GCC_VERSION(3,0)
86	# define ecb_decltype(x) typeof(x)	205	#define ecb_decltype(x) __typeof(x)
87	#endif	206	#endif
88		207
89	#define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
90	#define ecb_noinline ecb_attribute ((__noinline__))	208	#define ecb_noinline ecb_attribute ((__noinline__))
91	#define ecb_noreturn ecb_attribute ((__noreturn__))	209	#define ecb_noreturn ecb_attribute ((__noreturn__))
92	#define ecb_unused ecb_attribute ((__unused__))	210	#define ecb_unused ecb_attribute ((__unused__))
93	#define ecb_const ecb_attribute ((__const__))	211	#define ecb_const ecb_attribute ((__const__))
94	#define ecb_pure ecb_attribute ((__pure__))	212	#define ecb_pure ecb_attribute ((__pure__))
		213
		214	#if ECB_GCC_VERSION(4,3)
		215	#define ecb_artificial ecb_attribute ((__artificial__))
95	#define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */	216	#define ecb_hot ecb_attribute ((__hot__))
96	#define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */	217	#define ecb_cold ecb_attribute ((__cold__))
		218	#else
		219	#define ecb_artificial
		220	#define ecb_hot
		221	#define ecb_cold
		222	#endif
97		223
98	/* put into if's if you are very sure that the expression */	224	/* put around conditional expressions if you are very sure that the */
99	/* is mostly true or mostly false. note that these return */	225	/* expression is mostly true or mostly false. note that these return */
100	/* booleans, not the expression. */	226	/* booleans, not the expression. */
101	#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)	227	#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
102	#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)	228	#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
		229	/* for compatibility to the rest of the world */
103	#define ecb_likely(expr) ecb_expect_true (expr)	230	#define ecb_likely(expr) ecb_expect_true (expr)
104	#define ecb_unlikely(expr) ecb_expect_false (expr)	231	#define ecb_unlikely(expr) ecb_expect_false (expr)
105		232
		233	/* count trailing zero bits and count # of one bits */
		234	#if ECB_GCC_VERSION(3,4)
		235	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
		236	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
		237	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
		238	#define ecb_ctz32(x) __builtin_ctz (x)
		239	#define ecb_ctz64(x) __builtin_ctzll (x)
		240	#define ecb_popcount32(x) __builtin_popcount (x)
		241	/* no popcountll */
		242	#else
		243	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
		244	ecb_function_ int
		245	ecb_ctz32 (uint32_t x)
		246	{
		247	int r = 0;
		248
		249	x &= ~x + 1; /* this isolates the lowest bit */
		250
		251	#if ECB_branchless_on_i386
		252	r += !!(x & 0xaaaaaaaa) << 0;
		253	r += !!(x & 0xcccccccc) << 1;
		254	r += !!(x & 0xf0f0f0f0) << 2;
		255	r += !!(x & 0xff00ff00) << 3;
		256	r += !!(x & 0xffff0000) << 4;
		257	#else
		258	if (x & 0xaaaaaaaa) r += 1;
		259	if (x & 0xcccccccc) r += 2;
		260	if (x & 0xf0f0f0f0) r += 4;
		261	if (x & 0xff00ff00) r += 8;
		262	if (x & 0xffff0000) r += 16;
		263	#endif
		264
		265	return r;
		266	}
		267
		268	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
		269	ecb_function_ int
		270	ecb_ctz64 (uint64_t x)
		271	{
		272	int shift = x & 0xffffffffU ? 0 : 32;
		273	return ecb_ctz32 (x >> shift) + shift;
		274	}
		275
		276	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
		277	ecb_function_ int
		278	ecb_popcount32 (uint32_t x)
		279	{
		280	x -= (x >> 1) & 0x55555555;
		281	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
		282	x = ((x >> 4) + x) & 0x0f0f0f0f;
		283	x *= 0x01010101;
		284
		285	return x >> 24;
		286	}
		287
		288	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
		289	ecb_function_ int ecb_ld32 (uint32_t x)
		290	{
		291	int r = 0;
		292
		293	if (x >> 16) { x >>= 16; r += 16; }
		294	if (x >> 8) { x >>= 8; r += 8; }
		295	if (x >> 4) { x >>= 4; r += 4; }
		296	if (x >> 2) { x >>= 2; r += 2; }
		297	if (x >> 1) { r += 1; }
		298
		299	return r;
		300	}
		301
		302	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
		303	ecb_function_ int ecb_ld64 (uint64_t x)
		304	{
		305	int r = 0;
		306
		307	if (x >> 32) { x >>= 32; r += 32; }
		308
		309	return r + ecb_ld32 (x);
		310	}
		311	#endif
		312
		313	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
		314	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
		315	{
		316	return ( (x * 0x0802U & 0x22110U)
		317	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
		318	}
		319
		320	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
		321	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
		322	{
		323	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);
		324	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);
		325	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);
		326	x = ( x >> 8 ) \| ( x << 8);
		327
		328	return x;
		329	}
		330
		331	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
		332	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
		333	{
		334	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);
		335	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);
		336	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);
		337	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);
		338	x = ( x >> 16 ) \| ( x << 16);
		339
		340	return x;
		341	}
		342
		343	/* popcount64 is only available on 64 bit cpus as gcc builtin */
		344	/* so for this version we are lazy */
		345	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
		346	ecb_function_ int
		347	ecb_popcount64 (uint64_t x)
		348	{
		349	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
		350	}
		351
		352	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
		353	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
		354	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
		355	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
		356	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
		357	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
		358	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
		359	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
		360
		361	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }
		362	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }
		363	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }
		364	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }
		365	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }
		366	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }
		367	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }
		368	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }
		369
		370	#if ECB_GCC_VERSION(4,3)
		371	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
		372	#define ecb_bswap32(x) __builtin_bswap32 (x)
		373	#define ecb_bswap64(x) __builtin_bswap64 (x)
		374	#else
		375	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
		376	ecb_function_ uint16_t
		377	ecb_bswap16 (uint16_t x)
		378	{
		379	return ecb_rotl16 (x, 8);
		380	}
		381
		382	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
		383	ecb_function_ uint32_t
		384	ecb_bswap32 (uint32_t x)
		385	{
		386	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);
		387	}
		388
		389	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
		390	ecb_function_ uint64_t
		391	ecb_bswap64 (uint64_t x)
		392	{
		393	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);
		394	}
		395	#endif
		396
		397	#if ECB_GCC_VERSION(4,5)
		398	#define ecb_unreachable() __builtin_unreachable ()
		399	#else
		400	/* this seems to work fine, but gcc always emits a warning for it :/ */
		401	ecb_inline void ecb_unreachable (void) ecb_noreturn;
		402	ecb_inline void ecb_unreachable (void) { }
		403	#endif
		404
106	/* try to tell the compiler that some condition is definitely true */	405	/* try to tell the compiler that some condition is definitely true */
107	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)	406	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
108		407
109	/* count trailing zero bits and count # of one bits */
110	#if ECB_GCC_VERSION(3,4)
111	#define ecb_ctz32(x) __builtin_ctz (x)
112	#define ecb_popcount32(x) __builtin_popcount (x)
113	#else
114	ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
115	ECB_HEADER_INLINE int
116	ecb_ctz32 (uint32_t x)
117	{
118	int r = 0;
119
120	x &= -x; /* this isolates the lowest bit */
121
122	if (x & 0xaaaaaaaa) r += 1;
123	if (x & 0xcccccccc) r += 2;
124	if (x & 0xf0f0f0f0) r += 4;
125	if (x & 0xff00ff00) r += 8;
126	if (x & 0xffff0000) r += 16;
127
128	return r;
129	}
130
131	ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
132	ECB_HEADER_INLINE int
133	ecb_popcount32 (uint32_t x)
134	{
135	x -= (x >> 1) & 0x55555555;
136	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
137	x = ((x >> 4) + x) & 0x0f0f0f0f;
138	x *= 0x01010101;
139
140	return x >> 24;
141	}
142	#endif
143
144	#if ECB_GCC_VERSION(4,3)
145	# define ecb_bswap32(x) __builtin_bswap32 (x)
146	# define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
147	#else
148	ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
149	ECB_HEADER_INLINE uint32_t
150	ecb_bswap32 (uint32_t x)
151	{
152	return (x >> 24)
153	\| ((x >> 8) & 0x0000ff00)
154	\| ((x << 8) & 0x00ff0000)
155	\| (x << 24);
156	}
157
158	ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const;
159	ECB_HEADER_INLINE uint32_t
160	ecb_bswap16 (uint32_t x)
161	{
162	return ((x >> 8) & 0xff)
163	\| ((x << 8) & 0x00ff0000)
164	\| (x << 24);
165	}
166	#endif
167
168	#if ECB_GCC_VERSION(4,5)
169	# define ecb_unreachable() __builtin_unreachable ()
170	#else
171	/* this seems to work fine, but gcc always emits a warning for it :/ */
172	ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;
173	ECB_HEADER_INLINE void ecb_unreachable (void) { }
174	#endif
175
176	ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;	408	ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
177	ECB_HEADER_INLINE unsigned char	409	ecb_inline unsigned char
178	ecb_byteorder_helper (void)	410	ecb_byteorder_helper (void)
179	{	411	{
180	const uint32_t u = 0x11223344;	412	const uint32_t u = 0x11223344;
181	return (unsigned char )&u;	413	return (unsigned char )&u;
182	}	414	}
183		415
184	ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;	416	ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
185	ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; };	417	ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
186	ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const;	418	ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
187	ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; };	419	ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
188		420
189	#if ECB_GCC_VERSION(3,0)	421	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
190	# define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))	422	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
191	#else	423	#else
192	# define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))	424	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
		425	#endif
		426
		427	#if __cplusplus
		428	template<typename T>
		429	static inline T ecb_div_rd (T val, T div)
		430	{
		431	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
		432	}
		433	template<typename T>
		434	static inline T ecb_div_ru (T val, T div)
		435	{
		436	return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
		437	}
		438	#else
		439	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
		440	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
193	#endif	441	#endif
194		442
195	#if ecb_cplusplus_does_not_suck	443	#if ecb_cplusplus_does_not_suck
196	// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)	444	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
197	template<typename T, int N>	445	template<typename T, int N>
198	static inline int ecb_array_length (const T (&arr)[N])	446	static inline int ecb_array_length (const T (&arr)[N])
199	{	447	{
200	return N;	448	return N;
201	}	449	}
202	#else	450	#else
203	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	451	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
204	#endif	452	#endif
205		453
206	ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
207	ECB_INLINE uint32_t
208	ecb_rotr32 (uint32_t x, unsigned int count)
209	{
210	return (x << (32 - count)) \| (x >> count);
211	}
212
213	ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
214	ECB_INLINE uint32_t
215	ecb_rotl32 (uint32_t x, unsigned int count)
216	{
217	return (x >> (32 - count)) \| (x << count);
218	}
219
220	#endif	454	#endif
221		455

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Comparing libecb/ecb.h (file contents): Revision 1.34 by root, Fri Jun 10 12:20:14 2011 UTC vs. Revision 1.82 by root, Fri Mar 23 19:05:22 2012 UTC

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Comparing libecb/ecb.h (file contents):
Revision 1.34 by root, Fri Jun 10 12:20:14 2011 UTC vs.
Revision 1.82 by root, Fri Mar 23 19:05:22 2012 UTC