[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 1.101 by root, Thu Jun 28 14:50:01 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	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	/* 16 bits major, 16 bits minor */
		34	#define ECB_VERSION 0x00010001
		35
		36	#ifdef _WIN32
		37	typedef signed char int8_t;
		38	typedef unsigned char uint8_t;
		39	typedef signed short int16_t;
		40	typedef unsigned short uint16_t;
		41	typedef signed int int32_t;
		42	typedef unsigned int uint32_t;
		43	#if __GNUC__
		44	typedef signed long long int64_t;
		45	typedef unsigned long long uint64_t;
		46	#else /* _MSC_VER \|\| __BORLANDC__ */
		47	typedef signed __int64 int64_t;
		48	typedef unsigned __int64 uint64_t;
		49	#endif
		50	#ifdef _WIN64
		51	#define ECB_PTRSIZE 8
		52	typedef uint64_t uintptr_t;
		53	typedef int64_t intptr_t;
		54	#else
		55	#define ECB_PTRSIZE 4
		56	typedef uint32_t uintptr_t;
		57	typedef int32_t intptr_t;
		58	#endif
		59	#else
33	#include <inttypes.h>	60	#include <inttypes.h>
		61	#if UINTMAX_MAX > 0xffffffffU
		62	#define ECB_PTRSIZE 8
		63	#else
		64	#define ECB_PTRSIZE 4
		65	#endif
		66	#endif
34		67
35	/* many compilers define _GNUC_ to some versions but then only implement	68	/* many compilers define _GNUC_ to some versions but then only implement
36	* what their idiot authors think are the "more important" extensions,	69	* what their idiot authors think are the "more important" extensions,
37	* causing enourmous grief in return for some better fake benchmark numbers.	70	* causing enormous grief in return for some better fake benchmark numbers.
38	* or so.	71	* or so.
39	* we try to detect these and simply assume they are not gcc - if they have	72	* 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.	73	* an issue with that they should have done it right in the first place.
41	*/	74	*/
42	#ifndef ECB_GCC_VERSION	75	#ifndef ECB_GCC_VERSION
43	# if defined(__INTEL_COMPILER) \|\| defined(__SUNPRO_C) \|\| defined(__llvm__)	76	#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	77	#define ECB_GCC_VERSION(major,minor) 0
45	# else	78	#else
46	# define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))	79	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
		80	#endif
47	# endif	81	#endif
		82
		83	#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
		84	#define ECB_C99 (__STDC_VERSION__ >= 199901L)
		85	#define ECB_C11 (__STDC_VERSION__ >= 201112L)
		86	#define ECB_CPP (__cplusplus+0)
		87	#define ECB_CPP11 (__cplusplus >= 201103L)
		88
		89	/*****************************************************************************/
		90
		91	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
		92	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
		93
		94	#if ECB_NO_THREADS
		95	#define ECB_NO_SMP 1
		96	#endif
		97
		98	#if ECB_NO_SMP
		99	#define ECB_MEMORY_FENCE do { } while (0)
		100	#endif
		101
		102	#ifndef ECB_MEMORY_FENCE
		103	#if ECB_GCC_VERSION(2,5) \|\| defined __INTEL_COMPILER \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		104	#if __i386 \|\| __i386__
		105	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
		106	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
		107	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		108	#elif __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__
		109	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
		110	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
		111	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		112	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__
		113	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		114	#elif defined __ARM_ARCH_6__ \|\| defined __ARM_ARCH_6J__ \
		115	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__
		116	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
		117	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \
		118	\|\| defined __ARM_ARCH_7M__ \|\| defined __ARM_ARCH_7R__
		119	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
		120	#elif __sparc \|\| __sparc__
		121	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad" : : : "memory")
		122	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
		123	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
		124	#elif defined __s390__ \|\| defined __s390x__
		125	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
		126	#elif defined __mips__
		127	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		128	#elif defined __alpha__
		129	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
		130	#elif defined __hppa__
		131	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		132	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		133	#elif defined __ia64__
		134	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
		135	#endif
48	#endif	136	#endif
		137	#endif
49		138
		139	#ifndef ECB_MEMORY_FENCE
		140	#if ECB_GCC_VERSION(4,7)
		141	/* see comment below (stdatomic.h) about the C11 memory model. */
		142	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
		143	#elif defined __clang && __has_feature (cxx_atomic)
		144	/* see comment below (stdatomic.h) about the C11 memory model. */
		145	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
		146	#elif ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__
		147	#define ECB_MEMORY_FENCE __sync_synchronize ()
		148	#elif _MSC_VER >= 1400 /* VC++ 2005 */
		149	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		150	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
		151	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
		152	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
		153	#elif defined _WIN32
		154	#include <WinNT.h>
		155	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
		156	#elif __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		157	#include <mbarrier.h>
		158	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
		159	#define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
		160	#define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
		161	#elif __xlC__
		162	#define ECB_MEMORY_FENCE __sync ()
		163	#endif
		164	#endif
		165
		166	#ifndef ECB_MEMORY_FENCE
		167	#if ECB_C11 && !defined __STDC_NO_ATOMICS__
		168	/* we assume that these memory fences work on all variables/all memory accesses, */
		169	/* not just C11 atomics and atomic accesses */
		170	#include <stdatomic.h>
		171	/* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
		172	/* any fence other than seq_cst, which isn't very efficient for us. */
		173	/* Why that is, we don't know - either the C11 memory model is quite useless */
		174	/* for most usages, or gcc and clang have a bug */
		175	/* I currently lean towards the latter, and inefficiently implement */
		176	/* all three of ecb's fences as a seq_cst fence */
		177	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
		178	#endif
		179	#endif
		180
		181	#ifndef ECB_MEMORY_FENCE
		182	#if !ECB_AVOID_PTHREADS
		183	/*
		184	* if you get undefined symbol references to pthread_mutex_lock,
		185	* or failure to find pthread.h, then you should implement
		186	* the ECB_MEMORY_FENCE operations for your cpu/compiler
		187	* OR provide pthread.h and link against the posix thread library
		188	* of your system.
		189	*/
		190	#include <pthread.h>
		191	#define ECB_NEEDS_PTHREADS 1
		192	#define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
		193
		194	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
		195	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
		196	#endif
		197	#endif
		198
		199	#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
		200	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
		201	#endif
		202
		203	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
		204	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
		205	#endif
		206
		207	/*****************************************************************************/
		208
50	#ifndef __cplusplus	209	#if __cplusplus
51	# if __STDC_VERSION__ >= 199901L	210	#define ecb_inline static inline
52	# define ECB_INLINE inline	211	#elif ECB_GCC_VERSION(2,5)
53	typedef _Bool ecb_bool;	212	#define ecb_inline static __inline__
		213	#elif ECB_C99
		214	#define ecb_inline static inline
54	# else	215	#else
55	# define ECB_INLINE inline /* yeah! */	216	#define ecb_inline static
		217	#endif
		218
		219	#if ECB_GCC_VERSION(3,3)
		220	#define ecb_restrict __restrict__
		221	#elif ECB_C99
		222	#define ecb_restrict restrict
		223	#else
		224	#define ecb_restrict
		225	#endif
		226
56	typedef int ecb_bool;	227	typedef int ecb_bool;
57	# endif
58	#endif
59		228
60	#define ECB_CONCAT_(a, b) a ## b	229	#define ECB_CONCAT_(a, b) a ## b
61	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	230	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
62	#define ECB_STRINGIFY_(a) # a	231	#define ECB_STRINGIFY_(a) # a
63	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)	232	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
64		233
65	#define ECB_HEADER_INLINE static ECB_INLINE	234	#define ecb_function_ ecb_inline
66		235
67	#if ECB_GCC_VERSION(3,1)	236	#if ECB_GCC_VERSION(3,1)
68	# define ecb_attribute(attrlist) __attribute__(attrlist)	237	#define ecb_attribute(attrlist) __attribute__(attrlist)
69	# define ecb_is_constant(expr) __builtin_constant_p (expr)	238	#define ecb_is_constant(expr) __builtin_constant_p (expr)
70	# define ecb_expect(expr,value) __builtin_expect ((expr),(value))	239	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
71	# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)	240	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
72	#else	241	#else
73	# define ecb_attribute(attrlist)	242	#define ecb_attribute(attrlist)
74	# define ecb_is_constant(expr) 0	243	#define ecb_is_constant(expr) 0
75	# define ecb_expect(expr,value) (expr)	244	#define ecb_expect(expr,value) (expr)
76	# define ecb_prefetch(addr,rw,locality)	245	#define ecb_prefetch(addr,rw,locality)
77	#endif	246	#endif
78		247
79	/* no emulation for ecb_decltype */	248	/* no emulation for ecb_decltype */
80	#if ECB_GCC_VERSION(4,5)	249	#if ECB_GCC_VERSION(4,5)
81	# define ecb_decltype(x) __decltype(x)	250	#define ecb_decltype(x) __decltype(x)
82	#elif ECB_GCC_VERSION(3,0)	251	#elif ECB_GCC_VERSION(3,0)
83	# define ecb_decltype(x) typeof(x)	252	#define ecb_decltype(x) __typeof(x)
84	#endif	253	#endif
85		254
86	#define ecb_noinline ecb_attribute ((noinline))	255	#define ecb_noinline ecb_attribute ((__noinline__))
87	#define ecb_noreturn ecb_attribute ((noreturn))
88	#define ecb_unused ecb_attribute ((unused))	256	#define ecb_unused ecb_attribute ((__unused__))
89	#define ecb_const ecb_attribute ((const))	257	#define ecb_const ecb_attribute ((__const__))
90	#define ecb_pure ecb_attribute ((pure))	258	#define ecb_pure ecb_attribute ((__pure__))
		259
		260	#if ECB_C11
		261	#define ecb_noreturn _Noreturn
		262	#else
		263	#define ecb_noreturn ecb_attribute ((__noreturn__))
		264	#endif
		265
		266	#if ECB_GCC_VERSION(4,3)
		267	#define ecb_artificial ecb_attribute ((__artificial__))
91	#define ecb_hot ecb_attribute ((hot)) /* 4.3 */	268	#define ecb_hot ecb_attribute ((__hot__))
92	#define ecb_cold ecb_attribute ((cold)) /* 4.3 */	269	#define ecb_cold ecb_attribute ((__cold__))
		270	#else
		271	#define ecb_artificial
		272	#define ecb_hot
		273	#define ecb_cold
		274	#endif
93		275
94	/* put into if's if you are very sure that the expression */	276	/* put around conditional expressions if you are very sure that the */
95	/* is mostly true or mosty false. note that these return */	277	/* expression is mostly true or mostly false. note that these return */
96	/* booleans, not the expression. */	278	/* booleans, not the expression. */
97	#define ecb_unlikely(expr) ecb_expect (!!(expr), 0)	279	#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
		280	#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
		281	/* for compatibility to the rest of the world */
98	#define ecb_likely(expr) ecb_expect (!!(expr), 1)	282	#define ecb_likely(expr) ecb_expect_true (expr)
99		283	#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		284
103	/* count trailing zero bits and count # of one bits */	285	/* count trailing zero bits and count # of one bits */
104	#if ECB_GCC_VERSION(3,4)	286	#if ECB_GCC_VERSION(3,4)
		287	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
		288	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
		289	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
105	#define ecb_ctz32 (x) __builtin_ctz (x)	290	#define ecb_ctz32(x) __builtin_ctz (x)
		291	#define ecb_ctz64(x) __builtin_ctzll (x)
106	#define ecb_popcount32 (x) __builtin_popcount (x)	292	#define ecb_popcount32(x) __builtin_popcount (x)
		293	/* no popcountll */
107	#else	294	#else
108	ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;	295	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
109	ECB_HEADER_INLINE	296	ecb_function_ int
110	ecb_ctz32 (uint32_t x)	297	ecb_ctz32 (uint32_t x)
		298	{
		299	int r = 0;
		300
		301	x &= ~x + 1; /* this isolates the lowest bit */
		302
		303	#if ECB_branchless_on_i386
		304	r += !!(x & 0xaaaaaaaa) << 0;
		305	r += !!(x & 0xcccccccc) << 1;
		306	r += !!(x & 0xf0f0f0f0) << 2;
		307	r += !!(x & 0xff00ff00) << 3;
		308	r += !!(x & 0xffff0000) << 4;
		309	#else
		310	if (x & 0xaaaaaaaa) r += 1;
		311	if (x & 0xcccccccc) r += 2;
		312	if (x & 0xf0f0f0f0) r += 4;
		313	if (x & 0xff00ff00) r += 8;
		314	if (x & 0xffff0000) r += 16;
		315	#endif
		316
		317	return r;
		318	}
		319
		320	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
		321	ecb_function_ int
		322	ecb_ctz64 (uint64_t x)
		323	{
		324	int shift = x & 0xffffffffU ? 0 : 32;
		325	return ecb_ctz32 (x >> shift) + shift;
		326	}
		327
		328	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
		329	ecb_function_ int
		330	ecb_popcount32 (uint32_t x)
		331	{
		332	x -= (x >> 1) & 0x55555555;
		333	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
		334	x = ((x >> 4) + x) & 0x0f0f0f0f;
		335	x *= 0x01010101;
		336
		337	return x >> 24;
		338	}
		339
		340	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
		341	ecb_function_ int ecb_ld32 (uint32_t x)
		342	{
		343	int r = 0;
		344
		345	if (x >> 16) { x >>= 16; r += 16; }
		346	if (x >> 8) { x >>= 8; r += 8; }
		347	if (x >> 4) { x >>= 4; r += 4; }
		348	if (x >> 2) { x >>= 2; r += 2; }
		349	if (x >> 1) { r += 1; }
		350
		351	return r;
		352	}
		353
		354	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
		355	ecb_function_ int ecb_ld64 (uint64_t x)
		356	{
		357	int r = 0;
		358
		359	if (x >> 32) { x >>= 32; r += 32; }
		360
		361	return r + ecb_ld32 (x);
		362	}
		363	#endif
		364
		365	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
		366	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
		367	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
		368	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
		369
		370	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
		371	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
111	{	372	{
112	int r = 0;	373	return ( (x * 0x0802U & 0x22110U)
113		374	\| (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	}	375	}
124		376
125	ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;	377	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
126	ECB_HEADER_INLINE	378	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
127	ecb_popcount32 (uint32_t x)
128	{	379	{
129	x -= (x >> 1) & 0x55555555;	380	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);
130	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);	381	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);
131	x = ((x >> 4) + x) & 0x0f0f0f0f;	382	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);
132	x *= 0x01010101;	383	x = ( x >> 8 ) \| ( x << 8);
133		384
134	return x >> 24;	385	return x;
135	}	386	}
136	#endif	387
		388	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
		389	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
		390	{
		391	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);
		392	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);
		393	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);
		394	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);
		395	x = ( x >> 16 ) \| ( x << 16);
		396
		397	return x;
		398	}
		399
		400	/* popcount64 is only available on 64 bit cpus as gcc builtin */
		401	/* so for this version we are lazy */
		402	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
		403	ecb_function_ int
		404	ecb_popcount64 (uint64_t x)
		405	{
		406	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
		407	}
		408
		409	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
		410	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
		411	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
		412	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
		413	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
		414	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
		415	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
		416	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
		417
		418	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }
		419	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }
		420	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }
		421	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }
		422	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }
		423	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }
		424	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }
		425	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }
137		426
138	#if ECB_GCC_VERSION(4,3)	427	#if ECB_GCC_VERSION(4,3)
139	# define ecb_bswap32(x) __builtin_bswap32 (x)
140	# define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)	428	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
		429	#define ecb_bswap32(x) __builtin_bswap32 (x)
		430	#define ecb_bswap64(x) __builtin_bswap64 (x)
141	#else	431	#else
		432	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
		433	ecb_function_ uint16_t
		434	ecb_bswap16 (uint16_t x)
		435	{
		436	return ecb_rotl16 (x, 8);
		437	}
		438
142	ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;	439	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
143	ECB_HEADER_INLINE uint32_t	440	ecb_function_ uint32_t
144	ecb_bswap32 (uint32_t x)	441	ecb_bswap32 (uint32_t x)
145	{	442	{
146	return (x >> 24)	443	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);
147	\| ((x >> 8) & 0x0000ff00)	444	}
148	\| ((x << 8) & 0x00ff0000)
149	\| (x << 24);
150	}
151		445
152	ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const;	446	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
153	ECB_HEADER_INLINE uint32_t	447	ecb_function_ uint64_t
154	ecb_bswap16 (uint32_t x)	448	ecb_bswap64 (uint64_t x)
155	{	449	{
156	return ((x >> 8) & 0xff)	450	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);
157	\| ((x << 8) & 0x00ff0000)	451	}
158	\| (x << 24);
159	}
160	#endif	452	#endif
161		453
162	#if ECB_GCC_VERSION(4,5)	454	#if ECB_GCC_VERSION(4,5)
163	# define ecb_unreachable() __builtin_unreachable ()	455	#define ecb_unreachable() __builtin_unreachable ()
164	#else	456	#else
165	/* this seems to work fine, but gcc always emits a warning for it :/ */	457	/* this seems to work fine, but gcc always emits a warning for it :/ */
166	ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;	458	ecb_inline void ecb_unreachable (void) ecb_noreturn;
167	ECB_HEADER_INLINE void ecb_unreachable (void) { }	459	ecb_inline void ecb_unreachable (void) { }
168	#endif	460	#endif
169		461
		462	/* try to tell the compiler that some condition is definitely true */
		463	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
		464
170	ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;	465	ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
171	ECB_HEADER_INLINE unsigned char	466	ecb_inline unsigned char
172	ecb_byteorder_helper (void)	467	ecb_byteorder_helper (void)
173	{	468	{
174	const uint32_t u = 0x11223344;	469	/* the union code still generates code under pressure in gcc, */
175	return (unsigned char )&u;	470	/* but less than using pointers, and always seem to */
		471	/* successfully return a constant. */
		472	/* the reason why we have this horrible preprocessor mess */
		473	/* is to avoid it in all cases, at least on common architectures */
		474	/* and yes, gcc defines __BYTE_ORDER__, g++ does not */
		475	#if __i386 \|\| __i386__ \|\| _M_X86 \|\| __amd64 \|\| __amd64__ \|\| _M_X64
		476	return 0x44;
		477	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
		478	return 0x44;
		479	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
		480	retrurn 0x11;
		481	#else
		482	union
		483	{
		484	uint32_t i;
		485	uint8_t c;
		486	} u = { 0x11223344 };
		487	return u.c;
		488	#endif
176	}	489	}
177		490
178	ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;	491	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; };	492	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;	493	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; };	494	ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
182		495
		496	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
		497	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
		498	#else
183	#define ecb_mod(m, n) ((m) < 0 ? ((n) - (-(m) % (n))) : ((m) % (n)))	499	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
		500	#endif
		501
		502	#if __cplusplus
		503	template<typename T>
		504	static inline T ecb_div_rd (T val, T div)
		505	{
		506	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
		507	}
		508	template<typename T>
		509	static inline T ecb_div_ru (T val, T div)
		510	{
		511	return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
		512	}
		513	#else
		514	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
		515	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
		516	#endif
184		517
185	#if ecb_cplusplus_does_not_suck	518	#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)	519	/* 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>	520	template<typename T, int N>
188	static inline int ecb_array_length (const T (&arr)[N])	521	static inline int ecb_array_length (const T (&arr)[N])
189	{	522	{
190	return N;	523	return N;
191	}	524	}
192	#else	525	#else
193	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	526	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
194	#endif	527	#endif
195		528
196	ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
197	ECB_INLINE uint32_t
198	ecb_rotr32 (uint32_t x, unsigned int count)
199	{
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	529	#endif
211		530

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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 1.101 by root, Thu Jun 28 14:50:01 2012 UTC

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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 1.101 by root, Thu Jun 28 14:50:01 2012 UTC