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Comparing libeio/ecb.h (file contents):
Revision 1.10 by root, Mon Sep 26 16:54:25 2011 UTC vs.
Revision 1.23 by root, Wed Feb 11 19:32:36 2015 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 (©) 2009-2015 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:
… …
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
26 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 26 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE. 27 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Alternatively, the contents of this file may be used under the terms of
30 * the GNU General Public License ("GPL") version 2 or any later version,
31 * in which case the provisions of the GPL are applicable instead of
32 * the above. If you wish to allow the use of your version of this file
33 * only under the terms of the GPL and not to allow others to use your
34 * version of this file under the BSD license, indicate your decision
35 * by deleting the provisions above and replace them with the notice
36 * and other provisions required by the GPL. If you do not delete the
37 * provisions above, a recipient may use your version of this file under
38 * either the BSD or the GPL.
28 */ 39 */
29 40
30#ifndef ECB_H 41#ifndef ECB_H
31#define ECB_H 42#define ECB_H
43
44/* 16 bits major, 16 bits minor */
45#define ECB_VERSION 0x00010004
32 46
33#ifdef _WIN32 47#ifdef _WIN32
34 typedef signed char int8_t; 48 typedef signed char int8_t;
35 typedef unsigned char uint8_t; 49 typedef unsigned char uint8_t;
36 typedef signed short int16_t; 50 typedef signed short int16_t;
… …
42 typedef unsigned long long uint64_t; 56 typedef unsigned long long uint64_t;
43 #else /* _MSC_VER || __BORLANDC__ */ 57 #else /* _MSC_VER || __BORLANDC__ */
44 typedef signed __int64 int64_t; 58 typedef signed __int64 int64_t;
45 typedef unsigned __int64 uint64_t; 59 typedef unsigned __int64 uint64_t;
46 #endif 60 #endif
61 #ifdef _WIN64
62 #define ECB_PTRSIZE 8
63 typedef uint64_t uintptr_t;
64 typedef int64_t intptr_t;
65 #else
66 #define ECB_PTRSIZE 4
67 typedef uint32_t uintptr_t;
68 typedef int32_t intptr_t;
69 #endif
47#else 70#else
48 #include <inttypes.h> 71 #include <inttypes.h>
72 #if UINTMAX_MAX > 0xffffffffU
73 #define ECB_PTRSIZE 8
74 #else
75 #define ECB_PTRSIZE 4
76 #endif
77#endif
78
79/* work around x32 idiocy by defining proper macros */
80#if __amd64 || __x86_64 || _M_AMD64 || _M_X64
81 #if _ILP32
82 #define ECB_AMD64_X32 1
83 #else
84 #define ECB_AMD64 1
85 #endif
49#endif 86#endif
50 87
51/* many compilers define _GNUC_ to some versions but then only implement 88/* many compilers define _GNUC_ to some versions but then only implement
52 * what their idiot authors think are the "more important" extensions, 89 * what their idiot authors think are the "more important" extensions,
53 * causing enormous grief in return for some better fake benchmark numbers. 90 * causing enormous grief in return for some better fake benchmark numbers.
54 * or so. 91 * or so.
55 * we try to detect these and simply assume they are not gcc - if they have 92 * 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. 93 * an issue with that they should have done it right in the first place.
57 */ 94 */
58#ifndef ECB_GCC_VERSION
59 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__) 95#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 96 #define ECB_GCC_VERSION(major,minor) 0
61 #else 97#else
62 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 98 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
63 #endif 99#endif
100
101#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
102
103#if __clang__ && defined __has_builtin
104 #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
105#else
106 #define ECB_CLANG_BUILTIN(x) 0
107#endif
108
109#if __clang__ && defined __has_extension
110 #define ECB_CLANG_EXTENSION(x) __has_extension (x)
111#else
112 #define ECB_CLANG_EXTENSION(x) 0
113#endif
114
115#define ECB_CPP (__cplusplus+0)
116#define ECB_CPP11 (__cplusplus >= 201103L)
117
118#if ECB_CPP
119 #define ECB_C 0
120 #define ECB_STDC_VERSION 0
121#else
122 #define ECB_C 1
123 #define ECB_STDC_VERSION __STDC_VERSION__
124#endif
125
126#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
127#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
128
129#if ECB_CPP
130 #define ECB_EXTERN_C extern "C"
131 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
132 #define ECB_EXTERN_C_END }
133#else
134 #define ECB_EXTERN_C extern
135 #define ECB_EXTERN_C_BEG
136 #define ECB_EXTERN_C_END
64#endif 137#endif
65 138
66/*****************************************************************************/ 139/*****************************************************************************/
67 140
68/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ 141/* 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 */ 142/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
70 143
71#if ECB_NO_THREADS || ECB_NO_SMP 144#if ECB_NO_THREADS
145 #define ECB_NO_SMP 1
146#endif
147
148#if ECB_NO_SMP
72 #define ECB_MEMORY_FENCE do { } while (0) 149 #define ECB_MEMORY_FENCE do { } while (0)
73#endif 150#endif
74 151
75#ifndef ECB_MEMORY_FENCE 152#ifndef ECB_MEMORY_FENCE
76 #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || defined(__clang__) 153 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
77 #if __i386__ 154 #if __i386 || __i386__
78 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 155 #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 */ 156 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
80 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ 157 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
81 #elif __amd64 158 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
82 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 159 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
83 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 160 #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 */ 161 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
85 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ 162 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
86 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 163 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
87 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \ 164 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
88 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__) 165 || 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") 166 #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__ ) \ 167 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
91 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ ) 168 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
92 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") 169 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
170 #elif __aarch64__
171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
172 #elif (__sparc || __sparc__) && !__sparcv8
173 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
174 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
175 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
176 #elif defined __s390__ || defined __s390x__
177 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
178 #elif defined __mips__
179 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
180 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
181 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
182 #elif defined __alpha__
183 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
184 #elif defined __hppa__
185 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
186 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
187 #elif defined __ia64__
188 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
189 #elif defined __m68k__
190 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
191 #elif defined __m88k__
192 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
193 #elif defined __sh__
194 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
93 #endif 195 #endif
94 #endif 196 #endif
95#endif 197#endif
96 198
97#ifndef ECB_MEMORY_FENCE 199#ifndef ECB_MEMORY_FENCE
200 #if ECB_GCC_VERSION(4,7)
201 /* see comment below (stdatomic.h) about the C11 memory model. */
202 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
203 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
204 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
205
206 #elif ECB_CLANG_EXTENSION(c_atomic)
207 /* see comment below (stdatomic.h) about the C11 memory model. */
208 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
209 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
210 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
211
98 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__) 212 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
99 #define ECB_MEMORY_FENCE __sync_synchronize () 213 #define ECB_MEMORY_FENCE __sync_synchronize ()
100 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */ 214 #elif _MSC_VER >= 1500 /* VC++ 2008 */
101 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */ 215 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
216 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
217 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
218 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
219 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
102 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 220 #elif _MSC_VER >= 1400 /* VC++ 2005 */
103 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 221 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
104 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 222 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
105 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ 223 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
106 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () 224 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
107 #elif defined(_WIN32) 225 #elif defined _WIN32
108 #include <WinNT.h> 226 #include <WinNT.h>
109 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ 227 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
228 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
229 #include <mbarrier.h>
230 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
231 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
232 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
233 #elif __xlC__
234 #define ECB_MEMORY_FENCE __sync ()
235 #endif
236#endif
237
238#ifndef ECB_MEMORY_FENCE
239 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
240 /* we assume that these memory fences work on all variables/all memory accesses, */
241 /* not just C11 atomics and atomic accesses */
242 #include <stdatomic.h>
243 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
244 /* any fence other than seq_cst, which isn't very efficient for us. */
245 /* Why that is, we don't know - either the C11 memory model is quite useless */
246 /* for most usages, or gcc and clang have a bug */
247 /* I *currently* lean towards the latter, and inefficiently implement */
248 /* all three of ecb's fences as a seq_cst fence */
249 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
250 /* for all __atomic_thread_fence's except seq_cst */
251 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
110 #endif 252 #endif
111#endif 253#endif
112 254
113#ifndef ECB_MEMORY_FENCE 255#ifndef ECB_MEMORY_FENCE
114 #if !ECB_AVOID_PTHREADS 256 #if !ECB_AVOID_PTHREADS
… …
126 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; 268 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) 269 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
128 #endif 270 #endif
129#endif 271#endif
130 272
131#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE) 273#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
132 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 274 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
133#endif 275#endif
134 276
135#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE) 277#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
136 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 278 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
137#endif 279#endif
138 280
139/*****************************************************************************/ 281/*****************************************************************************/
140 282
141#define ECB_C99 (__STDC_VERSION__ >= 199901L) 283#if ECB_CPP
142
143#if __cplusplus
144 #define ecb_inline static inline 284 #define ecb_inline static inline
145#elif ECB_GCC_VERSION(2,5) 285#elif ECB_GCC_VERSION(2,5)
146 #define ecb_inline static __inline__ 286 #define ecb_inline static __inline__
147#elif ECB_C99 287#elif ECB_C99
148 #define ecb_inline static inline 288 #define ecb_inline static inline
… …
165#define ECB_STRINGIFY_(a) # a 305#define ECB_STRINGIFY_(a) # a
166#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 306#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
167 307
168#define ecb_function_ ecb_inline 308#define ecb_function_ ecb_inline
169 309
170#if ECB_GCC_VERSION(3,1) 310#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
171 #define ecb_attribute(attrlist) __attribute__(attrlist) 311 #define ecb_attribute(attrlist) __attribute__ (attrlist)
312#else
313 #define ecb_attribute(attrlist)
314#endif
315
316#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
172 #define ecb_is_constant(expr) __builtin_constant_p (expr) 317 #define ecb_is_constant(expr) __builtin_constant_p (expr)
318#else
319 /* possible C11 impl for integral types
320 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
321 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
322
323 #define ecb_is_constant(expr) 0
324#endif
325
326#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
173 #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 327 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
328#else
329 #define ecb_expect(expr,value) (expr)
330#endif
331
332#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
174 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 333 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
175#else 334#else
176 #define ecb_attribute(attrlist)
177 #define ecb_is_constant(expr) 0
178 #define ecb_expect(expr,value) (expr)
179 #define ecb_prefetch(addr,rw,locality) 335 #define ecb_prefetch(addr,rw,locality)
180#endif 336#endif
181 337
182/* no emulation for ecb_decltype */ 338/* no emulation for ecb_decltype */
183#if ECB_GCC_VERSION(4,5) 339#if ECB_CPP11
340 // older implementations might have problems with decltype(x)::type, work around it
341 template<class T> struct ecb_decltype_t { typedef T type; };
184 #define ecb_decltype(x) __decltype(x) 342 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
185#elif ECB_GCC_VERSION(3,0) 343#elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
186 #define ecb_decltype(x) __typeof(x) 344 #define ecb_decltype(x) __typeof__ (x)
345#endif
346
347#if _MSC_VER >= 1300
348 #define ecb_deprecated __declspec (deprecated)
349#else
350 #define ecb_deprecated ecb_attribute ((__deprecated__))
187#endif 351#endif
188 352
189#define ecb_noinline ecb_attribute ((__noinline__)) 353#define ecb_noinline ecb_attribute ((__noinline__))
190#define ecb_noreturn ecb_attribute ((__noreturn__))
191#define ecb_unused ecb_attribute ((__unused__)) 354#define ecb_unused ecb_attribute ((__unused__))
192#define ecb_const ecb_attribute ((__const__)) 355#define ecb_const ecb_attribute ((__const__))
193#define ecb_pure ecb_attribute ((__pure__)) 356#define ecb_pure ecb_attribute ((__pure__))
357
358/* TODO http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx __declspec(noreturn) */
359#if ECB_C11 || __IBMC_NORETURN
360 /* http://pic.dhe.ibm.com/infocenter/compbg/v121v141/topic/com.ibm.xlcpp121.bg.doc/language_ref/noreturn.html */
361 #define ecb_noreturn _Noreturn
362#else
363 #define ecb_noreturn ecb_attribute ((__noreturn__))
364#endif
194 365
195#if ECB_GCC_VERSION(4,3) 366#if ECB_GCC_VERSION(4,3)
196 #define ecb_artificial ecb_attribute ((__artificial__)) 367 #define ecb_artificial ecb_attribute ((__artificial__))
197 #define ecb_hot ecb_attribute ((__hot__)) 368 #define ecb_hot ecb_attribute ((__hot__))
198 #define ecb_cold ecb_attribute ((__cold__)) 369 #define ecb_cold ecb_attribute ((__cold__))
… …
210/* for compatibility to the rest of the world */ 381/* for compatibility to the rest of the world */
211#define ecb_likely(expr) ecb_expect_true (expr) 382#define ecb_likely(expr) ecb_expect_true (expr)
212#define ecb_unlikely(expr) ecb_expect_false (expr) 383#define ecb_unlikely(expr) ecb_expect_false (expr)
213 384
214/* count trailing zero bits and count # of one bits */ 385/* count trailing zero bits and count # of one bits */
215#if ECB_GCC_VERSION(3,4) 386#if ECB_GCC_VERSION(3,4) \
387 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
388 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
389 && ECB_CLANG_BUILTIN(__builtin_popcount))
216 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ 390 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
217 #define ecb_ld32(x) (__builtin_clz (x) ^ 31) 391 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
218 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63) 392 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
219 #define ecb_ctz32(x) __builtin_ctz (x) 393 #define ecb_ctz32(x) __builtin_ctz (x)
220 #define ecb_ctz64(x) __builtin_ctzll (x) 394 #define ecb_ctz64(x) __builtin_ctzll (x)
221 #define ecb_popcount32(x) __builtin_popcount (x) 395 #define ecb_popcount32(x) __builtin_popcount (x)
222 /* no popcountll */ 396 /* no popcountll */
223#else 397#else
224 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; 398 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
225 ecb_function_ int 399 ecb_function_ ecb_const int
226 ecb_ctz32 (uint32_t x) 400 ecb_ctz32 (uint32_t x)
227 { 401 {
228 int r = 0; 402 int r = 0;
229 403
230 x &= ~x + 1; /* this isolates the lowest bit */ 404 x &= ~x + 1; /* this isolates the lowest bit */
… …
244#endif 418#endif
245 419
246 return r; 420 return r;
247 } 421 }
248 422
249 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const; 423 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
250 ecb_function_ int 424 ecb_function_ ecb_const int
251 ecb_ctz64 (uint64_t x) 425 ecb_ctz64 (uint64_t x)
252 { 426 {
253 int shift = x & 0xffffffffU ? 0 : 32; 427 int shift = x & 0xffffffffU ? 0 : 32;
254 return ecb_ctz32 (x >> shift) + shift; 428 return ecb_ctz32 (x >> shift) + shift;
255 } 429 }
256 430
257 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; 431 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
258 ecb_function_ int 432 ecb_function_ ecb_const int
259 ecb_popcount32 (uint32_t x) 433 ecb_popcount32 (uint32_t x)
260 { 434 {
261 x -= (x >> 1) & 0x55555555; 435 x -= (x >> 1) & 0x55555555;
262 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 436 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
263 x = ((x >> 4) + x) & 0x0f0f0f0f; 437 x = ((x >> 4) + x) & 0x0f0f0f0f;
264 x *= 0x01010101; 438 x *= 0x01010101;
265 439
266 return x >> 24; 440 return x >> 24;
267 } 441 }
268 442
269 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; 443 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
270 ecb_function_ int ecb_ld32 (uint32_t x) 444 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
271 { 445 {
272 int r = 0; 446 int r = 0;
273 447
274 if (x >> 16) { x >>= 16; r += 16; } 448 if (x >> 16) { x >>= 16; r += 16; }
275 if (x >> 8) { x >>= 8; r += 8; } 449 if (x >> 8) { x >>= 8; r += 8; }
… …
278 if (x >> 1) { r += 1; } 452 if (x >> 1) { r += 1; }
279 453
280 return r; 454 return r;
281 } 455 }
282 456
283 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; 457 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
284 ecb_function_ int ecb_ld64 (uint64_t x) 458 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
285 { 459 {
286 int r = 0; 460 int r = 0;
287 461
288 if (x >> 32) { x >>= 32; r += 32; } 462 if (x >> 32) { x >>= 32; r += 32; }
289 463
290 return r + ecb_ld32 (x); 464 return r + ecb_ld32 (x);
291 } 465 }
292#endif 466#endif
467
468ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
469ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
470ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
471ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
472
473ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
474ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
475{
476 return ( (x * 0x0802U & 0x22110U)
477 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
478}
479
480ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
481ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
482{
483 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
484 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
485 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
486 x = ( x >> 8 ) | ( x << 8);
487
488 return x;
489}
490
491ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
492ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
493{
494 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
495 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
496 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
497 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
498 x = ( x >> 16 ) | ( x << 16);
499
500 return x;
501}
293 502
294/* popcount64 is only available on 64 bit cpus as gcc builtin */ 503/* popcount64 is only available on 64 bit cpus as gcc builtin */
295/* so for this version we are lazy */ 504/* so for this version we are lazy */
296ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; 505ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
297ecb_function_ int 506ecb_function_ ecb_const int
298ecb_popcount64 (uint64_t x) 507ecb_popcount64 (uint64_t x)
299{ 508{
300 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); 509 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
301} 510}
302 511
303ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const; 512ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
304ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const; 513ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
305ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const; 514ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
306ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const; 515ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
307ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; 516ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
308ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; 517ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
309ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const; 518ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
310ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const; 519ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
311 520
312ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } 521ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
313ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } 522ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
314ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } 523ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
315ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } 524ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
316ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } 525ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
317ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } 526ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
318ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } 527ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
319ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } 528ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
320 529
321#if ECB_GCC_VERSION(4,3) 530#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
322 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) 531 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
323 #define ecb_bswap32(x) __builtin_bswap32 (x) 532 #define ecb_bswap32(x) __builtin_bswap32 (x)
324 #define ecb_bswap64(x) __builtin_bswap64 (x) 533 #define ecb_bswap64(x) __builtin_bswap64 (x)
325#else 534#else
326 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; 535 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
327 ecb_function_ uint16_t 536 ecb_function_ ecb_const uint16_t
328 ecb_bswap16 (uint16_t x) 537 ecb_bswap16 (uint16_t x)
329 { 538 {
330 return ecb_rotl16 (x, 8); 539 return ecb_rotl16 (x, 8);
331 } 540 }
332 541
333 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; 542 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
334 ecb_function_ uint32_t 543 ecb_function_ ecb_const uint32_t
335 ecb_bswap32 (uint32_t x) 544 ecb_bswap32 (uint32_t x)
336 { 545 {
337 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); 546 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
338 } 547 }
339 548
340 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; 549 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
341 ecb_function_ uint64_t 550 ecb_function_ ecb_const uint64_t
342 ecb_bswap64 (uint64_t x) 551 ecb_bswap64 (uint64_t x)
343 { 552 {
344 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); 553 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
345 } 554 }
346#endif 555#endif
347 556
348#if ECB_GCC_VERSION(4,5) 557#if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
349 #define ecb_unreachable() __builtin_unreachable () 558 #define ecb_unreachable() __builtin_unreachable ()
350#else 559#else
351 /* this seems to work fine, but gcc always emits a warning for it :/ */ 560 /* this seems to work fine, but gcc always emits a warning for it :/ */
352 ecb_function_ void ecb_unreachable (void) ecb_noreturn; 561 ecb_inline ecb_noreturn void ecb_unreachable (void);
353 ecb_function_ void ecb_unreachable (void) { } 562 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
354#endif 563#endif
355 564
356/* try to tell the compiler that some condition is definitely true */ 565/* try to tell the compiler that some condition is definitely true */
357#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 566#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
358 567
359ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; 568ecb_inline ecb_const unsigned char ecb_byteorder_helper (void);
360ecb_function_ unsigned char 569ecb_inline ecb_const unsigned char
361ecb_byteorder_helper (void) 570ecb_byteorder_helper (void)
362{ 571{
363 const uint32_t u = 0x11223344; 572 /* the union code still generates code under pressure in gcc, */
364 return *(unsigned char *)&u; 573 /* but less than using pointers, and always seems to */
574 /* successfully return a constant. */
575 /* the reason why we have this horrible preprocessor mess */
576 /* is to avoid it in all cases, at least on common architectures */
577 /* or when using a recent enough gcc version (>= 4.6) */
578#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
579 return 0x44;
580#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
581 return 0x44;
582#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
583 return 0x11;
584#else
585 union
586 {
587 uint32_t i;
588 uint8_t c;
589 } u = { 0x11223344 };
590 return u.c;
591#endif
365} 592}
366 593
367ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; 594ecb_inline ecb_const ecb_bool ecb_big_endian (void);
368ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } 595ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
369ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; 596ecb_inline ecb_const ecb_bool ecb_little_endian (void);
370ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } 597ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
371 598
372#if ECB_GCC_VERSION(3,0) || ECB_C99 599#if ECB_GCC_VERSION(3,0) || ECB_C99
373 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) 600 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
374#else 601#else
375 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) 602 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
376#endif 603#endif
377 604
378#if __cplusplus 605#if ECB_CPP
379 template<typename T> 606 template<typename T>
380 static inline T ecb_div_rd (T val, T div) 607 static inline T ecb_div_rd (T val, T div)
381 { 608 {
382 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div; 609 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
383 } 610 }
… …
400 } 627 }
401#else 628#else
402 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 629 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
403#endif 630#endif
404 631
632/*******************************************************************************/
633/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
634
635/* basically, everything uses "ieee pure-endian" floating point numbers */
636/* the only noteworthy exception is ancient armle, which uses order 43218765 */
637#if 0 \
638 || __i386 || __i386__ \
639 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
640 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
641 || defined __s390__ || defined __s390x__ \
642 || defined __mips__ \
643 || defined __alpha__ \
644 || defined __hppa__ \
645 || defined __ia64__ \
646 || defined __m68k__ \
647 || defined __m88k__ \
648 || defined __sh__ \
649 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \
650 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
651 || defined __aarch64__
652 #define ECB_STDFP 1
653 #include <string.h> /* for memcpy */
654#else
655 #define ECB_STDFP 0
656#endif
657
658#ifndef ECB_NO_LIBM
659
660 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
661
662 /* only the oldest of old doesn't have this one. solaris. */
663 #ifdef INFINITY
664 #define ECB_INFINITY INFINITY
665 #else
666 #define ECB_INFINITY HUGE_VAL
405#endif 667 #endif
406 668
669 #ifdef NAN
670 #define ECB_NAN NAN
671 #else
672 #define ECB_NAN ECB_INFINITY
673 #endif
674
675 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
676 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
677 #else
678 #define ecb_ldexpf(x,e) (float) ldexp ((x), (e))
679 #endif
680
681 /* converts an ieee half/binary16 to a float */
682 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
683 ecb_function_ ecb_const float
684 ecb_binary16_to_float (uint16_t x)
685 {
686 int e = (x >> 10) & 0x1f;
687 int m = x & 0x3ff;
688 float r;
689
690 if (!e ) r = ecb_ldexpf (m , -24);
691 else if (e != 31) r = ecb_ldexpf (m + 0x400, e - 25);
692 else if (m ) r = ECB_NAN;
693 else r = ECB_INFINITY;
694
695 return x & 0x8000 ? -r : r;
696 }
697
698 /* convert a float to ieee single/binary32 */
699 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
700 ecb_function_ ecb_const uint32_t
701 ecb_float_to_binary32 (float x)
702 {
703 uint32_t r;
704
705 #if ECB_STDFP
706 memcpy (&r, &x, 4);
707 #else
708 /* slow emulation, works for anything but -0 */
709 uint32_t m;
710 int e;
711
712 if (x == 0e0f ) return 0x00000000U;
713 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
714 if (x < -3.40282346638528860e+38f) return 0xff800000U;
715 if (x != x ) return 0x7fbfffffU;
716
717 m = frexpf (x, &e) * 0x1000000U;
718
719 r = m & 0x80000000U;
720
721 if (r)
722 m = -m;
723
724 if (e <= -126)
725 {
726 m &= 0xffffffU;
727 m >>= (-125 - e);
728 e = -126;
729 }
730
731 r |= (e + 126) << 23;
732 r |= m & 0x7fffffU;
733 #endif
734
735 return r;
736 }
737
738 /* converts an ieee single/binary32 to a float */
739 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
740 ecb_function_ ecb_const float
741 ecb_binary32_to_float (uint32_t x)
742 {
743 float r;
744
745 #if ECB_STDFP
746 memcpy (&r, &x, 4);
747 #else
748 /* emulation, only works for normals and subnormals and +0 */
749 int neg = x >> 31;
750 int e = (x >> 23) & 0xffU;
751
752 x &= 0x7fffffU;
753
754 if (e)
755 x |= 0x800000U;
756 else
757 e = 1;
758
759 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
760 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
761
762 r = neg ? -r : r;
763 #endif
764
765 return r;
766 }
767
768 /* convert a double to ieee double/binary64 */
769 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
770 ecb_function_ ecb_const uint64_t
771 ecb_double_to_binary64 (double x)
772 {
773 uint64_t r;
774
775 #if ECB_STDFP
776 memcpy (&r, &x, 8);
777 #else
778 /* slow emulation, works for anything but -0 */
779 uint64_t m;
780 int e;
781
782 if (x == 0e0 ) return 0x0000000000000000U;
783 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
784 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
785 if (x != x ) return 0X7ff7ffffffffffffU;
786
787 m = frexp (x, &e) * 0x20000000000000U;
788
789 r = m & 0x8000000000000000;;
790
791 if (r)
792 m = -m;
793
794 if (e <= -1022)
795 {
796 m &= 0x1fffffffffffffU;
797 m >>= (-1021 - e);
798 e = -1022;
799 }
800
801 r |= ((uint64_t)(e + 1022)) << 52;
802 r |= m & 0xfffffffffffffU;
803 #endif
804
805 return r;
806 }
807
808 /* converts an ieee double/binary64 to a double */
809 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
810 ecb_function_ ecb_const double
811 ecb_binary64_to_double (uint64_t x)
812 {
813 double r;
814
815 #if ECB_STDFP
816 memcpy (&r, &x, 8);
817 #else
818 /* emulation, only works for normals and subnormals and +0 */
819 int neg = x >> 63;
820 int e = (x >> 52) & 0x7ffU;
821
822 x &= 0xfffffffffffffU;
823
824 if (e)
825 x |= 0x10000000000000U;
826 else
827 e = 1;
828
829 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
830 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
831
832 r = neg ? -r : r;
833 #endif
834
835 return r;
836 }
837
838#endif
839
840#endif
841

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