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

Comparing libeio/ecb.h (file contents):
Revision 1.3 by root, Mon Jun 20 07:28:14 2011 UTC vs.
Revision 1.13 by root, Sat Jun 2 20:13:26 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
33	#ifdef _WIN32	36	#ifdef _WIN32
34	typedef signed char int8_t;	37	typedef signed char int8_t;
35	typedef unsigned char uint8_t;	38	typedef unsigned char uint8_t;
36	typedef signed short int16_t;	39	typedef signed short int16_t;
37	typedef unsigned short uint16_t;	40	typedef unsigned short uint16_t;
…		…
42	typedef unsigned long long uint64_t;	45	typedef unsigned long long uint64_t;
43	#else /* _MSC_VER \|\| __BORLANDC__ */	46	#else /* _MSC_VER \|\| __BORLANDC__ */
44	typedef signed __int64 int64_t;	47	typedef signed __int64 int64_t;
45	typedef unsigned __int64 uint64_t;	48	typedef unsigned __int64 uint64_t;
46	#endif	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;
47	#else	60	#else
48	#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
49	#endif	67	#endif
50		68
51	/* many compilers define _GNUC_ to some versions but then only implement	69	/* many compilers define _GNUC_ to some versions but then only implement
52	* what their idiot authors think are the "more important" extensions,	70	* what their idiot authors think are the "more important" extensions,
53	* causing enourmous grief in return for some better fake benchmark numbers.	71	* causing enormous grief in return for some better fake benchmark numbers.
54	* or so.	72	* or so.
55	* 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
56	* 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.
57	*/	75	*/
58	#ifndef ECB_GCC_VERSION	76	#ifndef ECB_GCC_VERSION
59	#if !defined(__GNUC_MINOR__) \|\| defined(__INTEL_COMPILER) \|\| defined(__SUNPRO_C) \|\| defined(__SUNPRO_CC) \|\| defined(__llvm__) \|\| defined(__clang__)	77	#if !defined __GNUC_MINOR__ \|\| defined __INTEL_COMPILER \|\| defined __SUNPRO_C \|\| defined __SUNPRO_CC \|\| defined __llvm__ \|\| defined __clang__
60	#define ECB_GCC_VERSION(major,minor) 0	78	#define ECB_GCC_VERSION(major,minor) 0
61	#else	79	#else
62	#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)))
63	#endif	81	#endif
64	#endif	82	#endif
65		83
		84	#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
66	#define ECB_C99 (__STDC_VERSION__ >= 199901L)	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
		137	#endif
		138	#endif
		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	/*****************************************************************************/
67		209
68	#if __cplusplus	210	#if __cplusplus
69	#define ecb_inline static inline	211	#define ecb_inline static inline
70	#elif ECB_GCC_VERSION(2,5)	212	#elif ECB_GCC_VERSION(2,5)
71	#define ecb_inline static __inline__	213	#define ecb_inline static __inline__
…		…
110	#elif ECB_GCC_VERSION(3,0)	252	#elif ECB_GCC_VERSION(3,0)
111	#define ecb_decltype(x) __typeof(x)	253	#define ecb_decltype(x) __typeof(x)
112	#endif	254	#endif
113		255
114	#define ecb_noinline ecb_attribute ((__noinline__))	256	#define ecb_noinline ecb_attribute ((__noinline__))
115	#define ecb_noreturn ecb_attribute ((__noreturn__))
116	#define ecb_unused ecb_attribute ((__unused__))	257	#define ecb_unused ecb_attribute ((__unused__))
117	#define ecb_const ecb_attribute ((__const__))	258	#define ecb_const ecb_attribute ((__const__))
118	#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
119		266
120	#if ECB_GCC_VERSION(4,3)	267	#if ECB_GCC_VERSION(4,3)
121	#define ecb_artificial ecb_attribute ((__artificial__))	268	#define ecb_artificial ecb_attribute ((__artificial__))
122	#define ecb_hot ecb_attribute ((__hot__))	269	#define ecb_hot ecb_attribute ((__hot__))
123	#define ecb_cold ecb_attribute ((__cold__))	270	#define ecb_cold ecb_attribute ((__cold__))
…		…
189	x *= 0x01010101;	336	x *= 0x01010101;
190		337
191	return x >> 24;	338	return x >> 24;
192	}	339	}
193		340
194	/* you have the choice beetween something with a table lookup, */
195	/* something using lots of bit arithmetic and a simple loop */
196	/* we went for the loop */
197	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;	341	ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
198	ecb_function_ int ecb_ld32 (uint32_t x)	342	ecb_function_ int ecb_ld32 (uint32_t x)
199	{	343	{
200	int r = 0;	344	int r = 0;
201		345
…		…
216	if (x >> 32) { x >>= 32; r += 32; }	360	if (x >> 32) { x >>= 32; r += 32; }
217		361
218	return r + ecb_ld32 (x);	362	return r + ecb_ld32 (x);
219	}	363	}
220	#endif	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)
		373	{
		374	return ( (x * 0x0802U & 0x22110U)
		375	\| (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
		376	}
		377
		378	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
		379	ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
		380	{
		381	x = ((x >> 1) & 0x5555) \| ((x & 0x5555) << 1);
		382	x = ((x >> 2) & 0x3333) \| ((x & 0x3333) << 2);
		383	x = ((x >> 4) & 0x0f0f) \| ((x & 0x0f0f) << 4);
		384	x = ( x >> 8 ) \| ( x << 8);
		385
		386	return x;
		387	}
		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	}
221		400
222	/* popcount64 is only available on 64 bit cpus as gcc builtin */	401	/* popcount64 is only available on 64 bit cpus as gcc builtin */
223	/* so for this version we are lazy */	402	/* so for this version we are lazy */
224	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;	403	ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
225	ecb_function_ int	404	ecb_function_ int
…		…
275		454
276	#if ECB_GCC_VERSION(4,5)	455	#if ECB_GCC_VERSION(4,5)
277	#define ecb_unreachable() __builtin_unreachable ()	456	#define ecb_unreachable() __builtin_unreachable ()
278	#else	457	#else
279	/* 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 :/ */
280	ecb_function_ void ecb_unreachable (void) ecb_noreturn;	459	ecb_inline void ecb_unreachable (void) ecb_noreturn;
281	ecb_function_ void ecb_unreachable (void) { }	460	ecb_inline void ecb_unreachable (void) { }
282	#endif	461	#endif
283		462
284	/* try to tell the compiler that some condition is definitely true */	463	/* try to tell the compiler that some condition is definitely true */
285	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)	464	#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
286		465
287	ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;	466	ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
288	ecb_function_ unsigned char	467	ecb_inline unsigned char
289	ecb_byteorder_helper (void)	468	ecb_byteorder_helper (void)
290	{	469	{
291	const uint32_t u = 0x11223344;	470	const uint32_t u = 0x11223344;
292	return (unsigned char )&u;	471	return (unsigned char )&u;
293	}	472	}
294		473
295	ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;	474	ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
296	ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }	475	ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
297	ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;	476	ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
298	ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }	477	ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
299		478
300	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99	479	#if ECB_GCC_VERSION(3,0) \|\| ECB_C99
301	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))	480	#define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
302	#else	481	#else
303	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))	482	#define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
		483	#endif
		484
		485	#if __cplusplus
		486	template<typename T>
		487	static inline T ecb_div_rd (T val, T div)
		488	{
		489	return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
		490	}
		491	template<typename T>
		492	static inline T ecb_div_ru (T val, T div)
		493	{
		494	return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
		495	}
		496	#else
		497	#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
		498	#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
304	#endif	499	#endif
305		500
306	#if ecb_cplusplus_does_not_suck	501	#if ecb_cplusplus_does_not_suck
307	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */	502	/* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
308	template<typename T, int N>	503	template<typename T, int N>

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Comparing libeio/ecb.h (file contents): Revision 1.3 by root, Mon Jun 20 07:28:14 2011 UTC vs. Revision 1.13 by root, Sat Jun 2 20:13:26 2012 UTC

Diff Legend

Comparing libeio/ecb.h (file contents):
Revision 1.3 by root, Mon Jun 20 07:28:14 2011 UTC vs.
Revision 1.13 by root, Sat Jun 2 20:13:26 2012 UTC