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Comparing libecb/ecb.h (file contents):
Revision 1.67 by sf-exg, Wed Aug 24 23:28:47 2011 UTC vs.
Revision 1.108 by root, Fri Jun 29 01:39:51 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
47#else 59#else
48 #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
49#endif 66#endif
50 67
51/* many compilers define _GNUC_ to some versions but then only implement 68/* many compilers define _GNUC_ to some versions but then only implement
52 * what their idiot authors think are the "more important" extensions, 69 * what their idiot authors think are the "more important" extensions,
53 * causing enormous grief in return for some better fake benchmark numbers. 70 * causing enormous grief in return for some better fake benchmark numbers.
54 * or so. 71 * or so.
55 * 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
56 * 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.
57 */ 74 */
58#ifndef ECB_GCC_VERSION 75#ifndef ECB_GCC_VERSION
59 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__) 76 #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 77 #define ECB_GCC_VERSION(major,minor) 0
61 #else 78 #else
62 #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)))
63 #endif 80 #endif
64#endif 81#endif
65 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#if ECB_CPP
90 #define ECB_EXTERN_C extern "C"
91 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
92 #define ECB_EXTERN_C_END }
93#else
94 #define ECB_EXTERN_C extern
95 #define ECB_EXTERN_C_BEG
96 #define ECB_EXTERN_C_END
97#endif
98
66/*****************************************************************************/ 99/*****************************************************************************/
67 100
68/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ 101/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
69/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ 102/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
70 103
71#if ECB_NO_THREADS || ECB_NO_SMP 104#if ECB_NO_THREADS
105 #define ECB_NO_SMP 1
106#endif
107
108#if ECB_NO_SMP
72 #define ECB_MEMORY_FENCE do { } while (0) 109 #define ECB_MEMORY_FENCE do { } while (0)
73#endif 110#endif
74 111
75#ifndef ECB_MEMORY_FENCE 112#ifndef ECB_MEMORY_FENCE
76 #if ECB_GCC_VERSION(2,5) 113 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
77 #if __i386__ 114 #if __i386 || __i386__
78 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 115 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
79 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ 116 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
80 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ 117 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
81 #elif __amd64 118 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
82 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 119 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
83 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 120 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
84 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ 121 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
85 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ 122 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
86 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 123 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
87 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \ 124 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
88 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__) 125 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
89 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") 126 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
90 #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \ 127 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
91 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ ) 128 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
92 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") 129 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
130 #elif __sparc || __sparc__
131 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
132 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
133 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
134 #elif defined __s390__ || defined __s390x__
135 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
136 #elif defined __mips__
137 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
138 #elif defined __alpha__
139 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
140 #elif defined __hppa__
141 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
142 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
143 #elif defined __ia64__
144 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
93 #endif 145 #endif
94 #endif 146 #endif
95#endif 147#endif
96 148
97#ifndef ECB_MEMORY_FENCE 149#ifndef ECB_MEMORY_FENCE
150 #if ECB_GCC_VERSION(4,7)
151 /* see comment below (stdatomic.h) about the C11 memory model. */
152 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
153 /*#elif defined __clang && __has_feature (cxx_atomic)*/
154 /* see comment below (stdatomic.h) about the C11 memory model. */
155 /*#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)*/
98 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) 156 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
99 #define ECB_MEMORY_FENCE __sync_synchronize () 157 #define ECB_MEMORY_FENCE __sync_synchronize ()
100 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
101 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
102 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 158 #elif _MSC_VER >= 1400 /* VC++ 2005 */
103 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 159 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
104 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 160 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
105 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ 161 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
106 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () 162 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
107 #elif defined(_WIN32) 163 #elif defined _WIN32
108 #include <WinNT.h> 164 #include <WinNT.h>
109 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ 165 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
166 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
167 #include <mbarrier.h>
168 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
169 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
170 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
171 #elif __xlC__
172 #define ECB_MEMORY_FENCE __sync ()
173 #endif
174#endif
175
176#ifndef ECB_MEMORY_FENCE
177 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
178 /* we assume that these memory fences work on all variables/all memory accesses, */
179 /* not just C11 atomics and atomic accesses */
180 #include <stdatomic.h>
181 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
182 /* any fence other than seq_cst, which isn't very efficient for us. */
183 /* Why that is, we don't know - either the C11 memory model is quite useless */
184 /* for most usages, or gcc and clang have a bug */
185 /* I *currently* lean towards the latter, and inefficiently implement */
186 /* all three of ecb's fences as a seq_cst fence */
187 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
110 #endif 188 #endif
111#endif 189#endif
112 190
113#ifndef ECB_MEMORY_FENCE 191#ifndef ECB_MEMORY_FENCE
114 #if !ECB_AVOID_PTHREADS 192 #if !ECB_AVOID_PTHREADS
… …
126 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; 204 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
127 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) 205 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
128 #endif 206 #endif
129#endif 207#endif
130 208
131#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE) 209#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
132 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 210 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
133#endif 211#endif
134 212
135#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE) 213#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
136 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 214 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
137#endif 215#endif
138 216
139/*****************************************************************************/ 217/*****************************************************************************/
140
141#define ECB_C99 (__STDC_VERSION__ >= 199901L)
142 218
143#if __cplusplus 219#if __cplusplus
144 #define ecb_inline static inline 220 #define ecb_inline static inline
145#elif ECB_GCC_VERSION(2,5) 221#elif ECB_GCC_VERSION(2,5)
146 #define ecb_inline static __inline__ 222 #define ecb_inline static __inline__
… …
185#elif ECB_GCC_VERSION(3,0) 261#elif ECB_GCC_VERSION(3,0)
186 #define ecb_decltype(x) __typeof(x) 262 #define ecb_decltype(x) __typeof(x)
187#endif 263#endif
188 264
189#define ecb_noinline ecb_attribute ((__noinline__)) 265#define ecb_noinline ecb_attribute ((__noinline__))
190#define ecb_noreturn ecb_attribute ((__noreturn__))
191#define ecb_unused ecb_attribute ((__unused__)) 266#define ecb_unused ecb_attribute ((__unused__))
192#define ecb_const ecb_attribute ((__const__)) 267#define ecb_const ecb_attribute ((__const__))
193#define ecb_pure ecb_attribute ((__pure__)) 268#define ecb_pure ecb_attribute ((__pure__))
269
270#if ECB_C11
271 #define ecb_noreturn _Noreturn
272#else
273 #define ecb_noreturn ecb_attribute ((__noreturn__))
274#endif
194 275
195#if ECB_GCC_VERSION(4,3) 276#if ECB_GCC_VERSION(4,3)
196 #define ecb_artificial ecb_attribute ((__artificial__)) 277 #define ecb_artificial ecb_attribute ((__artificial__))
197 #define ecb_hot ecb_attribute ((__hot__)) 278 #define ecb_hot ecb_attribute ((__hot__))
198 #define ecb_cold ecb_attribute ((__cold__)) 279 #define ecb_cold ecb_attribute ((__cold__))
… …
289 370
290 return r + ecb_ld32 (x); 371 return r + ecb_ld32 (x);
291 } 372 }
292#endif 373#endif
293 374
375ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
376ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
377ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
378ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
379
380ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
381ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
382{
383 return ( (x * 0x0802U & 0x22110U)
384 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
385}
386
387ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
388ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
389{
390 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
391 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
392 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
393 x = ( x >> 8 ) | ( x << 8);
394
395 return x;
396}
397
398ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
399ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
400{
401 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
402 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
403 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
404 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
405 x = ( x >> 16 ) | ( x << 16);
406
407 return x;
408}
409
294/* popcount64 is only available on 64 bit cpus as gcc builtin */ 410/* popcount64 is only available on 64 bit cpus as gcc builtin */
295/* so for this version we are lazy */ 411/* so for this version we are lazy */
296ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; 412ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
297ecb_function_ int 413ecb_function_ int
298ecb_popcount64 (uint64_t x) 414ecb_popcount64 (uint64_t x)
… …
347 463
348#if ECB_GCC_VERSION(4,5) 464#if ECB_GCC_VERSION(4,5)
349 #define ecb_unreachable() __builtin_unreachable () 465 #define ecb_unreachable() __builtin_unreachable ()
350#else 466#else
351 /* this seems to work fine, but gcc always emits a warning for it :/ */ 467 /* this seems to work fine, but gcc always emits a warning for it :/ */
352 ecb_function_ void ecb_unreachable (void) ecb_noreturn; 468 ecb_inline void ecb_unreachable (void) ecb_noreturn;
353 ecb_function_ void ecb_unreachable (void) { } 469 ecb_inline void ecb_unreachable (void) { }
354#endif 470#endif
355 471
356/* try to tell the compiler that some condition is definitely true */ 472/* try to tell the compiler that some condition is definitely true */
357#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 473#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
358 474
359ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; 475ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
360ecb_function_ unsigned char 476ecb_inline unsigned char
361ecb_byteorder_helper (void) 477ecb_byteorder_helper (void)
362{ 478{
363 const uint32_t u = 0x11223344; 479 /* the union code still generates code under pressure in gcc, */
364 return *(unsigned char *)&u; 480 /* but less than using pointers, and always seem to */
481 /* successfully return a constant. */
482 /* the reason why we have this horrible preprocessor mess */
483 /* is to avoid it in all cases, at least on common architectures */
484 /* and yes, gcc defines __BYTE_ORDER__, g++ does not */
485#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
486 return 0x44;
487#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
488 return 0x44;
489#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
490 retrurn 0x11;
491#else
492 union
493 {
494 uint32_t i;
495 uint8_t c;
496 } u = { 0x11223344 };
497 return u.c;
498#endif
365} 499}
366 500
367ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; 501ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
368ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } 502ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
369ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; 503ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
370ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } 504ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
371 505
372#if ECB_GCC_VERSION(3,0) || ECB_C99 506#if ECB_GCC_VERSION(3,0) || ECB_C99
373 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 507 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
374#else 508#else
375 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 509 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
376#endif 510#endif
377 511
512#if __cplusplus
513 template<typename T>
514 static inline T ecb_div_rd (T val, T div)
515 {
516 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
517 }
518 template<typename T>
519 static inline T ecb_div_ru (T val, T div)
520 {
521 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
522 }
523#else
378#define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div)) 524 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
379#define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div)) 525 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
526#endif
380 527
381#if ecb_cplusplus_does_not_suck 528#if ecb_cplusplus_does_not_suck
382 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ 529 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
383 template<typename T, int N> 530 template<typename T, int N>
384 static inline int ecb_array_length (const T (&arr)[N]) 531 static inline int ecb_array_length (const T (&arr)[N])
… …
387 } 534 }
388#else 535#else
389 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 536 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
390#endif 537#endif
391 538
539/*******************************************************************************/
540/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
541
542/* basically, everything uses "ieee pure-endian" floating point numbers */
543/* the only noteworthy exception is ancient armle, which uses order 43218765 */
544#if 0 \
545 || __i386 || __i386__ \
546 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
547 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
548 || defined __arm__ && defined __ARM_EABI__ \
549 || defined __s390__ || defined __s390x__ \
550 || defined __mips__ \
551 || defined __alpha__ \
552 || defined __hppa__ \
553 || defined __ia64__ \
554 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
555 #define ECB_STDFP 1
556 #include <string.h> /* for memcpy */
557#else
558 #define ECB_STDFP 0
559#endif
560
561#ifndef ECB_NO_LIBM
562
563 /* convert a float to ieee single/binary32 */
564 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
565 ecb_function_ uint32_t
566 ecb_float_to_binary32 (float x)
567 {
568 uint32_t r;
569
570 #if ECB_STDFP
571 memcpy (&r, &x, 4);
572 #else
573 /* slow emulation, works for anything but -0 */
574 ECB_EXTERN_C float frexpf (float v, int *e);
575 uint32_t m;
576 int e;
577
578 if (x == 0e0f ) return 0x00000000U;
579 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
580 if (x < -3.40282346638528860e+38f) return 0xff800000U;
581 if (x != x ) return 0x7fbfffffU;
582
583 m = frexpf (x, &e) * 0x1000000U;
584
585 r = m & 0x80000000U;
586
587 if (r)
588 m = -m;
589
590 if (e <= -126)
591 {
592 m &= 0xffffffU;
593 m >>= (-125 - e);
594 e = -126;
595 }
596
597 r |= (e + 126) << 23;
598 r |= m & 0x7fffffU;
392#endif 599 #endif
393 600
601 return r;
602 }
603
604 /* converts an ieee single/binary32 to a float */
605 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
606 ecb_function_ float
607 ecb_binary32_to_float (uint32_t x)
608 {
609 float r;
610
611 #if ECB_STDFP
612 memcpy (&r, &x, 4);
613 #else
614 /* emulation, only works for normals and subnormals and +0 */
615 ECB_EXTERN_C float ldexpf (float x, int e);
616
617 int neg = x >> 31;
618 int e = (x >> 23) & 0xffU;
619
620 x &= 0x7fffffU;
621
622 if (e)
623 x |= 0x800000U;
624 else
625 e = 1;
626
627 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
628 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
629
630 r = neg ? -r : r;
631 #endif
632
633 return r;
634 }
635
636 /* convert a double to ieee double/binary64 */
637 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
638 ecb_function_ uint64_t
639 ecb_double_to_binary64 (double x)
640 {
641 uint64_t r;
642
643 #if ECB_STDFP
644 memcpy (&r, &x, 8);
645 #else
646 /* slow emulation, works for anything but -0 */
647 ECB_EXTERN_C double frexp (double v, int *e);
648 uint64_t m;
649 int e;
650
651 if (x == 0e0 ) return 0x0000000000000000U;
652 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
653 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
654 if (x != x ) return 0X7ff7ffffffffffffU;
655
656 m = frexp (x, &e) * 0x20000000000000U;
657
658 r = m & 0x8000000000000000;;
659
660 if (r)
661 m = -m;
662
663 if (e <= -1022)
664 {
665 m &= 0x1fffffffffffffU;
666 m >>= (-1021 - e);
667 e = -1022;
668 }
669
670 r |= ((uint64_t)(e + 1022)) << 52;
671 r |= m & 0xfffffffffffffU;
672 #endif
673
674 return r;
675 }
676
677 /* converts an ieee double/binary64 to a double */
678 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
679 ecb_function_ double
680 ecb_binary64_to_double (uint64_t x)
681 {
682 double r;
683
684 #if ECB_STDFP
685 memcpy (&r, &x, 8);
686 #else
687 /* emulation, only works for normals and subnormals and +0 */
688 ECB_EXTERN_C double ldexp (double x, int e);
689
690 int neg = x >> 63;
691 int e = (x >> 52) & 0x7ffU;
692
693 x &= 0xfffffffffffffU;
694
695 if (e)
696 x |= 0x10000000000000U;
697 else
698 e = 1;
699
700 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
701 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
702
703 r = neg ? -r : r;
704 #endif
705
706 return r;
707 }
708
709#endif
710
711#endif
712

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