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

Comparing libeio/ecb.h (file contents):
Revision 1.1 by root, Fri Jun 10 12:35:18 2011 UTC vs.
Revision 1.14 by root, Sun Jun 17 17:07:25 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	/* 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	typedef intptr_t ptrdiff_t;
		60	#else
33	#include <inttypes.h>	61	#include <inttypes.h>
		62	#if UINTMAX_MAX > 0xffffffffU
		63	#define ECB_PTRSIZE 8
		64	#else
		65	#define ECB_PTRSIZE 4
		66	#endif
		67	#endif
34		68
35	/* many compilers define _GNUC_ to some versions but then only implement	69	/* many compilers define _GNUC_ to some versions but then only implement
36	* what their idiot authors think are the "more important" extensions,	70	* what their idiot authors think are the "more important" extensions,
37	* causing enourmous grief in return for some better fake benchmark numbers.	71	* causing enormous grief in return for some better fake benchmark numbers.
38	* or so.	72	* or so.
39	* we try to detect these and simply assume they are not gcc - if they have	73	* 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.	74	* an issue with that they should have done it right in the first place.
41	*/	75	*/
42	#ifndef ECB_GCC_VERSION	76	#ifndef ECB_GCC_VERSION
43	# if defined(__INTEL_COMPILER) \|\| defined(__SUNPRO_C) \|\| defined(__llvm__)	77	#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	78	#define ECB_GCC_VERSION(major,minor) 0
45	# else	79	#else
46	# define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))	80	#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) \|\| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
		81	#endif
47	# endif	82	#endif
		83
		84	#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
		85	#define ECB_C99 (__STDC_VERSION__ >= 199901L)
		86	#define ECB_C11 (__STDC_VERSION__ >= 201112L)
		87	#define ECB_CPP (__cplusplus+0)
		88	#define ECB_CPP11 (__cplusplus >= 201103L)
		89
		90	/*****************************************************************************/
		91
		92	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
		93	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
		94
		95	#if ECB_NO_THREADS
		96	#define ECB_NO_SMP 1
		97	#endif
		98
		99	#if ECB_NO_SMP
		100	#define ECB_MEMORY_FENCE do { } while (0)
		101	#endif
		102
		103	#ifndef ECB_MEMORY_FENCE
		104	#if ECB_GCC_VERSION(2,5) \|\| defined __INTEL_COMPILER \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		105	#if __i386 \|\| __i386__
		106	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
		107	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
		108	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		109	#elif __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__
		110	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
		111	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
		112	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		113	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__
		114	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		115	#elif defined __ARM_ARCH_6__ \|\| defined __ARM_ARCH_6J__ \
		116	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__
		117	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
		118	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \
		119	\|\| defined __ARM_ARCH_7M__ \|\| defined __ARM_ARCH_7R__
		120	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
		121	#elif __sparc \|\| __sparc__
		122	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad" : : : "memory")
		123	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
		124	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
		125	#elif defined __s390__ \|\| defined __s390x__
		126	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
		127	#elif defined __mips__
		128	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		129	#elif defined __alpha__
		130	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
		131	#elif defined __hppa__
		132	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
		133	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
		134	#elif defined __ia64__
		135	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
		136	#endif
48	#endif	137	#endif
		138	#endif
49		139
		140	#ifndef ECB_MEMORY_FENCE
		141	#if ECB_GCC_VERSION(4,7)
		142	/* see comment below (stdatomic.h) about the C11 memory model. */
		143	#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
		144	#elif defined __clang && __has_feature (cxx_atomic)
		145	/* see comment below (stdatomic.h) about the C11 memory model. */
		146	#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
		147	#elif ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__
		148	#define ECB_MEMORY_FENCE __sync_synchronize ()
		149	#elif _MSC_VER >= 1400 /* VC++ 2005 */
		150	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		151	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
		152	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
		153	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
		154	#elif defined _WIN32
		155	#include <WinNT.h>
		156	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
		157	#elif __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		158	#include <mbarrier.h>
		159	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
		160	#define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
		161	#define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
		162	#elif __xlC__
		163	#define ECB_MEMORY_FENCE __sync ()
		164	#endif
		165	#endif
		166
		167	#ifndef ECB_MEMORY_FENCE
		168	#if ECB_C11 && !defined __STDC_NO_ATOMICS__
		169	/* we assume that these memory fences work on all variables/all memory accesses, */
		170	/* not just C11 atomics and atomic accesses */
		171	#include <stdatomic.h>
		172	/* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
		173	/* any fence other than seq_cst, which isn't very efficient for us. */
		174	/* Why that is, we don't know - either the C11 memory model is quite useless */
		175	/* for most usages, or gcc and clang have a bug */
		176	/* I currently lean towards the latter, and inefficiently implement */
		177	/* all three of ecb's fences as a seq_cst fence */
		178	#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
		179	#endif
		180	#endif
		181
		182	#ifndef ECB_MEMORY_FENCE
		183	#if !ECB_AVOID_PTHREADS
		184	/*
		185	* if you get undefined symbol references to pthread_mutex_lock,
		186	* or failure to find pthread.h, then you should implement
		187	* the ECB_MEMORY_FENCE operations for your cpu/compiler
		188	* OR provide pthread.h and link against the posix thread library
		189	* of your system.
		190	*/
		191	#include <pthread.h>
		192	#define ECB_NEEDS_PTHREADS 1
		193	#define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
		194
		195	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
		196	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
		197	#endif
		198	#endif
		199
		200	#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
		201	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
		202	#endif
		203
		204	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
		205	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
		206	#endif
		207
		208	/*****************************************************************************/
		209
50	#ifndef __cplusplus	210	#if __cplusplus
51	# if __STDC_VERSION__ >= 199901L	211	#define ecb_inline static inline
52	# define ECB_INLINE static inline	212	#elif ECB_GCC_VERSION(2,5)
53	typedef _Bool ecb_bool;	213	#define ecb_inline static __inline__
		214	#elif ECB_C99
		215	#define ecb_inline static inline
54	# else	216	#else
55	# define ECB_INLINE static inline /* yeah! */	217	#define ecb_inline static
		218	#endif
		219
		220	#if ECB_GCC_VERSION(3,3)
		221	#define ecb_restrict __restrict__
		222	#elif ECB_C99
		223	#define ecb_restrict restrict
		224	#else
		225	#define ecb_restrict
		226	#endif
		227
56	typedef int ecb_bool;	228	typedef int ecb_bool;
57	# endif
58	#else
59	# define ECB_INLINE static inline
60	typedef bool ecb_bool;
61	#endif
62		229
63	#define ECB_CONCAT_(a, b) a ## b	230	#define ECB_CONCAT_(a, b) a ## b
64	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	231	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
65	#define ECB_STRINGIFY_(a) # a	232	#define ECB_STRINGIFY_(a) # a
66	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)	233	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
67		234
68	#define ECB_HEADER_INLINE ECB_INLINE	235	#define ecb_function_ ecb_inline
69		236
70	#if ECB_GCC_VERSION(3,1)	237	#if ECB_GCC_VERSION(3,1)
71	# define ecb_attribute(attrlist) __attribute__(attrlist)	238	#define ecb_attribute(attrlist) __attribute__(attrlist)
72	# define ecb_is_constant(expr) __builtin_constant_p (expr)	239	#define ecb_is_constant(expr) __builtin_constant_p (expr)
73	# define ecb_expect(expr,value) __builtin_expect ((expr),(value))	240	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
74	# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)	241	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
75	#else	242	#else
76	# define ecb_attribute(attrlist)	243	#define ecb_attribute(attrlist)
77	# define ecb_is_constant(expr) 0	244	#define ecb_is_constant(expr) 0
78	# define ecb_expect(expr,value) (expr)	245	#define ecb_expect(expr,value) (expr)
79	# define ecb_prefetch(addr,rw,locality)	246	#define ecb_prefetch(addr,rw,locality)
80	#endif	247	#endif
81		248
82	/* no emulation for ecb_decltype */	249	/* no emulation for ecb_decltype */
83	#if ECB_GCC_VERSION(4,5)	250	#if ECB_GCC_VERSION(4,5)
84	# define ecb_decltype(x) __decltype(x)	251	#define ecb_decltype(x) __decltype(x)
85	#elif ECB_GCC_VERSION(3,0)	252	#elif ECB_GCC_VERSION(3,0)
86	# define ecb_decltype(x) typeof(x)	253	#define ecb_decltype(x) __typeof(x)
87	#endif	254	#endif
88		255
89	#define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
90	#define ecb_noinline ecb_attribute ((__noinline__))	256	#define ecb_noinline ecb_attribute ((__noinline__))
91	#define ecb_noreturn ecb_attribute ((__noreturn__))
92	#define ecb_unused ecb_attribute ((__unused__))	257	#define ecb_unused ecb_attribute ((__unused__))
93	#define ecb_const ecb_attribute ((__const__))	258	#define ecb_const ecb_attribute ((__const__))
94	#define ecb_pure ecb_attribute ((__pure__))	259	#define ecb_pure ecb_attribute ((__pure__))
		260
		261	#if ECB_C11
		262	#define ecb_noreturn _Noreturn
		263	#else
		264	#define ecb_noreturn ecb_attribute ((__noreturn__))
		265	#endif
		266
		267	#if ECB_GCC_VERSION(4,3)
		268	#define ecb_artificial ecb_attribute ((__artificial__))
95	#define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */	269	#define ecb_hot ecb_attribute ((__hot__))
96	#define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */	270	#define ecb_cold ecb_attribute ((__cold__))
		271	#else
		272	#define ecb_artificial
		273	#define ecb_hot
		274	#define ecb_cold
		275	#endif
97		276
98	/* put into if's if you are very sure that the expression */	277	/* put around conditional expressions if you are very sure that the */
99	/* is mostly true or mostly false. note that these return */	278	/* expression is mostly true or mostly false. note that these return */
100	/* booleans, not the expression. */	279	/* booleans, not the expression. */
101	#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)	280	#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
102	#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)	281	#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
		282	/* for compatibility to the rest of the world */
103	#define ecb_likely(expr) ecb_expect_true (expr)	283	#define ecb_likely(expr) ecb_expect_true (expr)
104	#define ecb_unlikely(expr) ecb_expect_false (expr)	284	#define ecb_unlikely(expr) ecb_expect_false (expr)
105		285
106	/* try to tell the compiler that some condition is definitely true */
107	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
108
109	/* count trailing zero bits and count # of one bits */	286	/* count trailing zero bits and count # of one bits */
110	#if ECB_GCC_VERSION(3,4)	287	#if ECB_GCC_VERSION(3,4)
		288	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
		289	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
		290	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
111	#define ecb_ctz32(x) __builtin_ctz (x)	291	#define ecb_ctz32(x) __builtin_ctz (x)
		292	#define ecb_ctz64(x) __builtin_ctzll (x)
112	#define ecb_popcount32(x) __builtin_popcount (x)	293	#define ecb_popcount32(x) __builtin_popcount (x)
		294	/* no popcountll */
113	#else	295	#else
114	ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;	296	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
115	ECB_HEADER_INLINE int	297	ecb_function_ int
116	ecb_ctz32 (uint32_t x)	298	ecb_ctz32 (uint32_t x)
		299	{
		300	int r = 0;
		301
		302	x &= ~x + 1; /* this isolates the lowest bit */
		303
		304	#if ECB_branchless_on_i386
		305	r += !!(x & 0xaaaaaaaa) << 0;
		306	r += !!(x & 0xcccccccc) << 1;
		307	r += !!(x & 0xf0f0f0f0) << 2;
		308	r += !!(x & 0xff00ff00) << 3;
		309	r += !!(x & 0xffff0000) << 4;
		310	#else
		311	if (x & 0xaaaaaaaa) r += 1;
		312	if (x & 0xcccccccc) r += 2;
		313	if (x & 0xf0f0f0f0) r += 4;
		314	if (x & 0xff00ff00) r += 8;
		315	if (x & 0xffff0000) r += 16;
		316	#endif
		317
		318	return r;
		319	}
		320
		321	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
		322	ecb_function_ int
		323	ecb_ctz64 (uint64_t x)
		324	{
		325	int shift = x & 0xffffffffU ? 0 : 32;
		326	return ecb_ctz32 (x >> shift) + shift;
		327	}
		328
		329	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
		330	ecb_function_ int
		331	ecb_popcount32 (uint32_t x)
		332	{
		333	x -= (x >> 1) & 0x55555555;
		334	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
		335	x = ((x >> 4) + x) & 0x0f0f0f0f;
		336	x *= 0x01010101;
		337
		338	return x >> 24;
		339	}
		340
		341	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
		342	ecb_function_ int ecb_ld32 (uint32_t x)
		343	{
		344	int r = 0;
		345
		346	if (x >> 16) { x >>= 16; r += 16; }
		347	if (x >> 8) { x >>= 8; r += 8; }
		348	if (x >> 4) { x >>= 4; r += 4; }
		349	if (x >> 2) { x >>= 2; r += 2; }
		350	if (x >> 1) { r += 1; }
		351
		352	return r;
		353	}
		354
		355	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
		356	ecb_function_ int ecb_ld64 (uint64_t x)
		357	{
		358	int r = 0;
		359
		360	if (x >> 32) { x >>= 32; r += 32; }
		361
		362	return r + ecb_ld32 (x);
		363	}
		364	#endif
		365
		366	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
		367	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
		368	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
		369	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
		370
		371	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
		372	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
117	{	373	{
118	int r = 0;	374	return ( (x * 0x0802U & 0x22110U)
119		375	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
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	}	376	}
130		377
131	ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;	378	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
132	ECB_HEADER_INLINE int	379	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
133	ecb_popcount32 (uint32_t x)
134	{	380	{
135	x -= (x >> 1) & 0x55555555;	381	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);
136	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);	382	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);
137	x = ((x >> 4) + x) & 0x0f0f0f0f;	383	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);
138	x *= 0x01010101;	384	x = ( x >> 8 ) \| ( x << 8);
139		385
140	return x >> 24;	386	return x;
141	}	387	}
142	#endif	388
		389	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
		390	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
		391	{
		392	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);
		393	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);
		394	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);
		395	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);
		396	x = ( x >> 16 ) \| ( x << 16);
		397
		398	return x;
		399	}
		400
		401	/* popcount64 is only available on 64 bit cpus as gcc builtin */
		402	/* so for this version we are lazy */
		403	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
		404	ecb_function_ int
		405	ecb_popcount64 (uint64_t x)
		406	{
		407	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
		408	}
		409
		410	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
		411	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
		412	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
		413	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
		414	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
		415	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
		416	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
		417	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
		418
		419	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }
		420	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }
		421	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }
		422	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }
		423	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }
		424	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }
		425	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }
		426	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }
143		427
144	#if ECB_GCC_VERSION(4,3)	428	#if ECB_GCC_VERSION(4,3)
145	# define ecb_bswap32(x) __builtin_bswap32 (x)
146	# define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)	429	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
		430	#define ecb_bswap32(x) __builtin_bswap32 (x)
		431	#define ecb_bswap64(x) __builtin_bswap64 (x)
147	#else	432	#else
		433	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
		434	ecb_function_ uint16_t
		435	ecb_bswap16 (uint16_t x)
		436	{
		437	return ecb_rotl16 (x, 8);
		438	}
		439
148	ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;	440	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
149	ECB_HEADER_INLINE uint32_t	441	ecb_function_ uint32_t
150	ecb_bswap32 (uint32_t x)	442	ecb_bswap32 (uint32_t x)
151	{	443	{
152	return (x >> 24)	444	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);
153	\| ((x >> 8) & 0x0000ff00)	445	}
154	\| ((x << 8) & 0x00ff0000)
155	\| (x << 24);
156	}
157		446
158	ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const;	447	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
159	ECB_HEADER_INLINE uint32_t	448	ecb_function_ uint64_t
160	ecb_bswap16 (uint32_t x)	449	ecb_bswap64 (uint64_t x)
161	{	450	{
162	return ((x >> 8) & 0xff)	451	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);
163	\| ((x << 8) & 0x00ff0000)	452	}
164	\| (x << 24);
165	}
166	#endif	453	#endif
167		454
168	#if ECB_GCC_VERSION(4,5)	455	#if ECB_GCC_VERSION(4,5)
169	# define ecb_unreachable() __builtin_unreachable ()	456	#define ecb_unreachable() __builtin_unreachable ()
170	#else	457	#else
171	/* this seems to work fine, but gcc always emits a warning for it :/ */	458	/* this seems to work fine, but gcc always emits a warning for it :/ */
172	ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;	459	ecb_inline void ecb_unreachable (void) ecb_noreturn;
173	ECB_HEADER_INLINE void ecb_unreachable (void) { }	460	ecb_inline void ecb_unreachable (void) { }
174	#endif	461	#endif
175		462
		463	/* try to tell the compiler that some condition is definitely true */
		464	#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
		465
176	ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;	466	ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
177	ECB_HEADER_INLINE unsigned char	467	ecb_inline unsigned char
178	ecb_byteorder_helper (void)	468	ecb_byteorder_helper (void)
179	{	469	{
180	const uint32_t u = 0x11223344;	470	/* the union code still generates code under pressure in gcc, */
181	return (unsigned char )&u;	471	/* but less than using pointers, and always seem to */
		472	/* successfully return a constant. */
		473	/* the reason why we have this horrible preprocessor mess */
		474	/* is to avoid it in all cases, at least on common architectures */
		475	/* and yes, gcc defines __BYTE_ORDER__, g++ does not */
		476	#if __i386 \|\| __i386__ \|\| _M_X86 \|\| __amd64 \|\| __amd64__ \|\| _M_X64
		477	return 0x44;
		478	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
		479	return 0x44;
		480	#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
		481	retrurn 0x11;
		482	#else
		483	union
		484	{
		485	uint32_t i;
		486	uint8_t c;
		487	} u = { 0x11223344 };
		488	return u.c;
		489	#endif
182	}	490	}
183		491
184	ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;	492	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; };	493	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;	494	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; };	495	ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
188		496
189	#if ECB_GCC_VERSION(3,0)	497	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
190	# define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))	498	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
191	#else	499	#else
192	# define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))	500	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
		501	#endif
		502
		503	#if __cplusplus
		504	template<typename T>
		505	static inline T ecb_div_rd (T val, T div)
		506	{
		507	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
		508	}
		509	template<typename T>
		510	static inline T ecb_div_ru (T val, T div)
		511	{
		512	return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
		513	}
		514	#else
		515	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
		516	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
193	#endif	517	#endif
194		518
195	#if ecb_cplusplus_does_not_suck	519	#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)	520	/* 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>	521	template<typename T, int N>
198	static inline int ecb_array_length (const T (&arr)[N])	522	static inline int ecb_array_length (const T (&arr)[N])
199	{	523	{
200	return N;	524	return N;
201	}	525	}
202	#else	526	#else
203	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	527	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
204	#endif	528	#endif
205		529
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	530	#endif
221		531

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Comparing libeio/ecb.h (file contents): Revision 1.1 by root, Fri Jun 10 12:35:18 2011 UTC vs. Revision 1.14 by root, Sun Jun 17 17:07:25 2012 UTC

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Comparing libeio/ecb.h (file contents):
Revision 1.1 by root, Fri Jun 10 12:35:18 2011 UTC vs.
Revision 1.14 by root, Sun Jun 17 17:07:25 2012 UTC