[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 1.12 by root, Mon May 28 17:00:19 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	/*****************************************************************************/
		85
		86	/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
		87	/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
		88
		89	#if ECB_NO_THREADS
		90	# define ECB_NO_SMP 1
		91	#endif
		92
		93	#if ECB_NO_THREADS \|\| ECB_NO_SMP
		94	#define ECB_MEMORY_FENCE do { } while (0)
		95	#endif
		96
		97	#ifndef ECB_MEMORY_FENCE
		98	#if ECB_GCC_VERSION(2,5) \|\| defined __INTEL_COMPILER \|\| (__llvm__ && __GNUC__) \|\| __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		99	#if __i386 \|\| __i386__
		100	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
		101	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
		102	#define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
		103	#elif __amd64 \|\| __amd64__ \|\| __x86_64 \|\| __x86_64__
		104	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
		105	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
		106	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
		107	#elif __powerpc__ \|\| __ppc__ \|\| __powerpc64__ \|\| __ppc64__
		108	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		109	#elif defined __ARM_ARCH_6__ \|\| defined __ARM_ARCH_6J__ \
		110	\|\| defined __ARM_ARCH_6K__ \|\| defined __ARM_ARCH_6ZK__
		111	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
		112	#elif defined __ARM_ARCH_7__ \|\| defined __ARM_ARCH_7A__ \
		113	\|\| defined __ARM_ARCH_7M__ \|\| defined __ARM_ARCH_7R__
		114	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
		115	#elif __sparc \|\| __sparc__
		116	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad \| #StoreStore \| #StoreLoad \| " : : : "memory")
		117	#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore \| #LoadLoad" : : : "memory")
		118	#define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore \| #StoreStore")
		119	#elif defined __s390__ \|\| defined __s390x__
		120	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
		121	#elif defined __mips__
		122	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
		123	#elif defined __alpha__
		124	#define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
		125	#endif
48	#endif	126	#endif
		127	#endif
49		128
		129	#ifndef ECB_MEMORY_FENCE
		130	#if ECB_GCC_VERSION(4,4) \|\| defined __INTEL_COMPILER \|\| defined __clang__
		131	#define ECB_MEMORY_FENCE __sync_synchronize ()
		132	/#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) /
		133	/#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) /
		134	#elif _MSC_VER >= 1400 /* VC++ 2005 */
		135	#pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
		136	#define ECB_MEMORY_FENCE _ReadWriteBarrier ()
		137	#define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
		138	#define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
		139	#elif defined _WIN32
		140	#include <WinNT.h>
		141	#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
		142	#elif __SUNPRO_C >= 0x5110 \|\| __SUNPRO_CC >= 0x5110
		143	#include <mbarrier.h>
		144	#define ECB_MEMORY_FENCE __machine_rw_barrier ()
		145	#define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
		146	#define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
		147	#elif __xlC__
		148	#define ECB_MEMORY_FENCE __sync ()
		149	#endif
		150	#endif
		151
		152	#ifndef ECB_MEMORY_FENCE
		153	#if !ECB_AVOID_PTHREADS
		154	/*
		155	* if you get undefined symbol references to pthread_mutex_lock,
		156	* or failure to find pthread.h, then you should implement
		157	* the ECB_MEMORY_FENCE operations for your cpu/compiler
		158	* OR provide pthread.h and link against the posix thread library
		159	* of your system.
		160	*/
		161	#include <pthread.h>
		162	#define ECB_NEEDS_PTHREADS 1
		163	#define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
		164
		165	static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
		166	#define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
		167	#endif
		168	#endif
		169
		170	#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
		171	#define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
		172	#endif
		173
		174	#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
		175	#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
		176	#endif
		177
		178	/*****************************************************************************/
		179
		180	#define ECB_C99 (__STDC_VERSION__ >= 199901L)
		181
50	#ifndef __cplusplus	182	#if __cplusplus
51	# if __STDC_VERSION__ >= 199901L	183	#define ecb_inline static inline
52	# define ECB_INLINE static inline	184	#elif ECB_GCC_VERSION(2,5)
53	typedef _Bool ecb_bool;	185	#define ecb_inline static __inline__
		186	#elif ECB_C99
		187	#define ecb_inline static inline
54	# else	188	#else
55	# define ECB_INLINE static inline /* yeah! */	189	#define ecb_inline static
		190	#endif
		191
		192	#if ECB_GCC_VERSION(3,3)
		193	#define ecb_restrict __restrict__
		194	#elif ECB_C99
		195	#define ecb_restrict restrict
		196	#else
		197	#define ecb_restrict
		198	#endif
		199
56	typedef int ecb_bool;	200	typedef int ecb_bool;
57	# endif
58	#else
59	# define ECB_INLINE static inline
60	typedef bool ecb_bool;
61	#endif
62		201
63	#define ECB_CONCAT_(a, b) a ## b	202	#define ECB_CONCAT_(a, b) a ## b
64	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)	203	#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
65	#define ECB_STRINGIFY_(a) # a	204	#define ECB_STRINGIFY_(a) # a
66	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)	205	#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
67		206
68	#define ECB_HEADER_INLINE ECB_INLINE	207	#define ecb_function_ ecb_inline
69		208
70	#if ECB_GCC_VERSION(3,1)	209	#if ECB_GCC_VERSION(3,1)
71	# define ecb_attribute(attrlist) __attribute__(attrlist)	210	#define ecb_attribute(attrlist) __attribute__(attrlist)
72	# define ecb_is_constant(expr) __builtin_constant_p (expr)	211	#define ecb_is_constant(expr) __builtin_constant_p (expr)
73	# define ecb_expect(expr,value) __builtin_expect ((expr),(value))	212	#define ecb_expect(expr,value) __builtin_expect ((expr),(value))
74	# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)	213	#define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
75	#else	214	#else
76	# define ecb_attribute(attrlist)	215	#define ecb_attribute(attrlist)
77	# define ecb_is_constant(expr) 0	216	#define ecb_is_constant(expr) 0
78	# define ecb_expect(expr,value) (expr)	217	#define ecb_expect(expr,value) (expr)
79	# define ecb_prefetch(addr,rw,locality)	218	#define ecb_prefetch(addr,rw,locality)
80	#endif	219	#endif
81		220
82	/* no emulation for ecb_decltype */	221	/* no emulation for ecb_decltype */
83	#if ECB_GCC_VERSION(4,5)	222	#if ECB_GCC_VERSION(4,5)
84	# define ecb_decltype(x) __decltype(x)	223	#define ecb_decltype(x) __decltype(x)
85	#elif ECB_GCC_VERSION(3,0)	224	#elif ECB_GCC_VERSION(3,0)
86	# define ecb_decltype(x) typeof(x)	225	#define ecb_decltype(x) __typeof(x)
87	#endif	226	#endif
88		227
89	#define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
90	#define ecb_noinline ecb_attribute ((__noinline__))	228	#define ecb_noinline ecb_attribute ((__noinline__))
91	#define ecb_noreturn ecb_attribute ((__noreturn__))	229	#define ecb_noreturn ecb_attribute ((__noreturn__))
92	#define ecb_unused ecb_attribute ((__unused__))	230	#define ecb_unused ecb_attribute ((__unused__))
93	#define ecb_const ecb_attribute ((__const__))	231	#define ecb_const ecb_attribute ((__const__))
94	#define ecb_pure ecb_attribute ((__pure__))	232	#define ecb_pure ecb_attribute ((__pure__))
		233
		234	#if ECB_GCC_VERSION(4,3)
		235	#define ecb_artificial ecb_attribute ((__artificial__))
95	#define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */	236	#define ecb_hot ecb_attribute ((__hot__))
96	#define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */	237	#define ecb_cold ecb_attribute ((__cold__))
		238	#else
		239	#define ecb_artificial
		240	#define ecb_hot
		241	#define ecb_cold
		242	#endif
97		243
98	/* put into if's if you are very sure that the expression */	244	/* put around conditional expressions if you are very sure that the */
99	/* is mostly true or mostly false. note that these return */	245	/* expression is mostly true or mostly false. note that these return */
100	/* booleans, not the expression. */	246	/* booleans, not the expression. */
101	#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)	247	#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
102	#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)	248	#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
		249	/* for compatibility to the rest of the world */
103	#define ecb_likely(expr) ecb_expect_true (expr)	250	#define ecb_likely(expr) ecb_expect_true (expr)
104	#define ecb_unlikely(expr) ecb_expect_false (expr)	251	#define ecb_unlikely(expr) ecb_expect_false (expr)
105		252
		253	/* count trailing zero bits and count # of one bits */
		254	#if ECB_GCC_VERSION(3,4)
		255	/* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
		256	#define ecb_ld32(x) (__builtin_clz (x) ^ 31)
		257	#define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
		258	#define ecb_ctz32(x) __builtin_ctz (x)
		259	#define ecb_ctz64(x) __builtin_ctzll (x)
		260	#define ecb_popcount32(x) __builtin_popcount (x)
		261	/* no popcountll */
		262	#else
		263	ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
		264	ecb_function_ int
		265	ecb_ctz32 (uint32_t x)
		266	{
		267	int r = 0;
		268
		269	x &= ~x + 1; /* this isolates the lowest bit */
		270
		271	#if ECB_branchless_on_i386
		272	r += !!(x & 0xaaaaaaaa) << 0;
		273	r += !!(x & 0xcccccccc) << 1;
		274	r += !!(x & 0xf0f0f0f0) << 2;
		275	r += !!(x & 0xff00ff00) << 3;
		276	r += !!(x & 0xffff0000) << 4;
		277	#else
		278	if (x & 0xaaaaaaaa) r += 1;
		279	if (x & 0xcccccccc) r += 2;
		280	if (x & 0xf0f0f0f0) r += 4;
		281	if (x & 0xff00ff00) r += 8;
		282	if (x & 0xffff0000) r += 16;
		283	#endif
		284
		285	return r;
		286	}
		287
		288	ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
		289	ecb_function_ int
		290	ecb_ctz64 (uint64_t x)
		291	{
		292	int shift = x & 0xffffffffU ? 0 : 32;
		293	return ecb_ctz32 (x >> shift) + shift;
		294	}
		295
		296	ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
		297	ecb_function_ int
		298	ecb_popcount32 (uint32_t x)
		299	{
		300	x -= (x >> 1) & 0x55555555;
		301	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
		302	x = ((x >> 4) + x) & 0x0f0f0f0f;
		303	x *= 0x01010101;
		304
		305	return x >> 24;
		306	}
		307
		308	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
		309	ecb_function_ int ecb_ld32 (uint32_t x)
		310	{
		311	int r = 0;
		312
		313	if (x >> 16) { x >>= 16; r += 16; }
		314	if (x >> 8) { x >>= 8; r += 8; }
		315	if (x >> 4) { x >>= 4; r += 4; }
		316	if (x >> 2) { x >>= 2; r += 2; }
		317	if (x >> 1) { r += 1; }
		318
		319	return r;
		320	}
		321
		322	ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
		323	ecb_function_ int ecb_ld64 (uint64_t x)
		324	{
		325	int r = 0;
		326
		327	if (x >> 32) { x >>= 32; r += 32; }
		328
		329	return r + ecb_ld32 (x);
		330	}
		331	#endif
		332
		333	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
		334	ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
		335	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
		336	ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
		337
		338	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
		339	ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
		340	{
		341	return ( (x * 0x0802U & 0x22110U)
		342	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
		343	}
		344
		345	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
		346	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
		347	{
		348	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);
		349	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);
		350	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);
		351	x = ( x >> 8 ) \| ( x << 8);
		352
		353	return x;
		354	}
		355
		356	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
		357	ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
		358	{
		359	x = ((x >> 1) & 0x55555555) \| ((x & 0x55555555) << 1);
		360	x = ((x >> 2) & 0x33333333) \| ((x & 0x33333333) << 2);
		361	x = ((x >> 4) & 0x0f0f0f0f) \| ((x & 0x0f0f0f0f) << 4);
		362	x = ((x >> 8) & 0x00ff00ff) \| ((x & 0x00ff00ff) << 8);
		363	x = ( x >> 16 ) \| ( x << 16);
		364
		365	return x;
		366	}
		367
		368	/* popcount64 is only available on 64 bit cpus as gcc builtin */
		369	/* so for this version we are lazy */
		370	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
		371	ecb_function_ int
		372	ecb_popcount64 (uint64_t x)
		373	{
		374	return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
		375	}
		376
		377	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
		378	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
		379	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
		380	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
		381	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
		382	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
		383	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
		384	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
		385
		386	ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) \| (x << count); }
		387	ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) \| (x >> count); }
		388	ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) \| (x << count); }
		389	ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) \| (x >> count); }
		390	ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) \| (x << count); }
		391	ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) \| (x >> count); }
		392	ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) \| (x << count); }
		393	ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) \| (x >> count); }
		394
		395	#if ECB_GCC_VERSION(4,3)
		396	#define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
		397	#define ecb_bswap32(x) __builtin_bswap32 (x)
		398	#define ecb_bswap64(x) __builtin_bswap64 (x)
		399	#else
		400	ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
		401	ecb_function_ uint16_t
		402	ecb_bswap16 (uint16_t x)
		403	{
		404	return ecb_rotl16 (x, 8);
		405	}
		406
		407	ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
		408	ecb_function_ uint32_t
		409	ecb_bswap32 (uint32_t x)
		410	{
		411	return (((uint32_t)ecb_bswap16 (x)) << 16) \| ecb_bswap16 (x >> 16);
		412	}
		413
		414	ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
		415	ecb_function_ uint64_t
		416	ecb_bswap64 (uint64_t x)
		417	{
		418	return (((uint64_t)ecb_bswap32 (x)) << 32) \| ecb_bswap32 (x >> 32);
		419	}
		420	#endif
		421
		422	#if ECB_GCC_VERSION(4,5)
		423	#define ecb_unreachable() __builtin_unreachable ()
		424	#else
		425	/* this seems to work fine, but gcc always emits a warning for it :/ */
		426	ecb_inline void ecb_unreachable (void) ecb_noreturn;
		427	ecb_inline void ecb_unreachable (void) { }
		428	#endif
		429
106	/* try to tell the compiler that some condition is definitely true */	430	/* try to tell the compiler that some condition is definitely true */
107	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)	431	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
108		432
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;	433	ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
177	ECB_HEADER_INLINE unsigned char	434	ecb_inline unsigned char
178	ecb_byteorder_helper (void)	435	ecb_byteorder_helper (void)
179	{	436	{
180	const uint32_t u = 0x11223344;	437	const uint32_t u = 0x11223344;
181	return (unsigned char )&u;	438	return (unsigned char )&u;
182	}	439	}
183		440
184	ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;	441	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; };	442	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;	443	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; };	444	ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
188		445
189	#if ECB_GCC_VERSION(3,0)	446	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
190	# define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))	447	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
191	#else	448	#else
192	# define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))	449	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
		450	#endif
		451
		452	#if __cplusplus
		453	template<typename T>
		454	static inline T ecb_div_rd (T val, T div)
		455	{
		456	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
		457	}
		458	template<typename T>
		459	static inline T ecb_div_ru (T val, T div)
		460	{
		461	return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
		462	}
		463	#else
		464	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
		465	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
193	#endif	466	#endif
194		467
195	#if ecb_cplusplus_does_not_suck	468	#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)	469	/* 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>	470	template<typename T, int N>
198	static inline int ecb_array_length (const T (&arr)[N])	471	static inline int ecb_array_length (const T (&arr)[N])
199	{	472	{
200	return N;	473	return N;
201	}	474	}
202	#else	475	#else
203	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))	476	#define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
204	#endif	477	#endif
205		478
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	479	#endif
221		480

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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 1.12 by root, Mon May 28 17:00:19 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 1.12 by root, Mon May 28 17:00:19 2012 UTC