/src/tarantool/third_party/libeio/ecb.h
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1 | | /* |
2 | | * libecb - http://software.schmorp.de/pkg/libecb |
3 | | * |
4 | | * Copyright (©) 2009-2015 Marc Alexander Lehmann <libecb@schmorp.de> |
5 | | * Copyright (©) 2011 Emanuele Giaquinta |
6 | | * All rights reserved. |
7 | | * |
8 | | * Redistribution and use in source and binary forms, with or without modifica- |
9 | | * tion, are permitted provided that the following conditions are met: |
10 | | * |
11 | | * 1. Redistributions of source code must retain the above copyright notice, |
12 | | * this list of conditions and the following disclaimer. |
13 | | * |
14 | | * 2. Redistributions in binary form must reproduce the above copyright |
15 | | * notice, this list of conditions and the following disclaimer in the |
16 | | * documentation and/or other materials provided with the distribution. |
17 | | * |
18 | | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
19 | | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
20 | | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
21 | | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
22 | | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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, |
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 |
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. |
39 | | */ |
40 | | |
41 | | #ifndef ECB_H |
42 | | #define ECB_H |
43 | | |
44 | | /* 16 bits major, 16 bits minor */ |
45 | | #define ECB_VERSION 0x00010004 |
46 | | |
47 | | #ifdef _WIN32 |
48 | | typedef signed char int8_t; |
49 | | typedef unsigned char uint8_t; |
50 | | typedef signed short int16_t; |
51 | | typedef unsigned short uint16_t; |
52 | | typedef signed int int32_t; |
53 | | typedef unsigned int uint32_t; |
54 | | #if __GNUC__ |
55 | | typedef signed long long int64_t; |
56 | | typedef unsigned long long uint64_t; |
57 | | #else /* _MSC_VER || __BORLANDC__ */ |
58 | | typedef signed __int64 int64_t; |
59 | | typedef unsigned __int64 uint64_t; |
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 |
70 | | #else |
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 | | #define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__) |
80 | | #define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64) |
81 | | |
82 | | /* work around x32 idiocy by defining proper macros */ |
83 | | #if ECB_GCC_AMD64 || ECB_MSVC_AMD64 |
84 | | #if _ILP32 |
85 | | #define ECB_AMD64_X32 1 |
86 | | #else |
87 | | #define ECB_AMD64 1 |
88 | | #endif |
89 | | #endif |
90 | | |
91 | | /* many compilers define _GNUC_ to some versions but then only implement |
92 | | * what their idiot authors think are the "more important" extensions, |
93 | | * causing enormous grief in return for some better fake benchmark numbers. |
94 | | * or so. |
95 | | * we try to detect these and simply assume they are not gcc - if they have |
96 | | * an issue with that they should have done it right in the first place. |
97 | | */ |
98 | | #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__ |
99 | | #define ECB_GCC_VERSION(major,minor) 0 |
100 | | #else |
101 | | #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
102 | | #endif |
103 | | |
104 | | #define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor))) |
105 | | |
106 | | #if __clang__ && defined __has_builtin |
107 | | #define ECB_CLANG_BUILTIN(x) __has_builtin (x) |
108 | | #else |
109 | | #define ECB_CLANG_BUILTIN(x) 0 |
110 | | #endif |
111 | | |
112 | | #if __clang__ && defined __has_extension |
113 | | #define ECB_CLANG_EXTENSION(x) __has_extension (x) |
114 | | #else |
115 | | #define ECB_CLANG_EXTENSION(x) 0 |
116 | | #endif |
117 | | |
118 | | #define ECB_CPP (__cplusplus+0) |
119 | | #define ECB_CPP11 (__cplusplus >= 201103L) |
120 | | |
121 | | #if ECB_CPP |
122 | | #define ECB_C 0 |
123 | | #define ECB_STDC_VERSION 0 |
124 | | #else |
125 | | #define ECB_C 1 |
126 | | #define ECB_STDC_VERSION __STDC_VERSION__ |
127 | | #endif |
128 | | |
129 | | #define ECB_C99 (ECB_STDC_VERSION >= 199901L) |
130 | | #define ECB_C11 (ECB_STDC_VERSION >= 201112L) |
131 | | |
132 | | #if ECB_CPP |
133 | | #define ECB_EXTERN_C extern "C" |
134 | | #define ECB_EXTERN_C_BEG ECB_EXTERN_C { |
135 | | #define ECB_EXTERN_C_END } |
136 | | #else |
137 | | #define ECB_EXTERN_C extern |
138 | | #define ECB_EXTERN_C_BEG |
139 | | #define ECB_EXTERN_C_END |
140 | | #endif |
141 | | |
142 | | /*****************************************************************************/ |
143 | | |
144 | | /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ |
145 | | /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ |
146 | | |
147 | | #if ECB_NO_THREADS |
148 | | #define ECB_NO_SMP 1 |
149 | | #endif |
150 | | |
151 | | #if ECB_NO_SMP |
152 | | #define ECB_MEMORY_FENCE do { } while (0) |
153 | | #endif |
154 | | |
155 | | /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */ |
156 | | #if __xlC__ && ECB_CPP |
157 | | #include <builtins.h> |
158 | | #endif |
159 | | |
160 | | #ifndef ECB_MEMORY_FENCE |
161 | | #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
162 | | #if __i386 || __i386__ |
163 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") |
164 | | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") |
165 | | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
166 | | #elif ECB_GCC_AMD64 |
167 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
168 | | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") |
169 | | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
170 | | #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ |
171 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
172 | | #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ |
173 | | || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ |
174 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
175 | | #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ |
176 | | || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ |
177 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
178 | | #elif __aarch64__ |
179 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory") |
180 | | #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8) |
181 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") |
182 | | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") |
183 | | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") |
184 | | #elif defined __s390__ || defined __s390x__ |
185 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") |
186 | | #elif defined __mips__ |
187 | | /* GNU/Linux emulates sync on mips1 architectures, so we force its use */ |
188 | | /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */ |
189 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory") |
190 | | #elif defined __alpha__ |
191 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") |
192 | | #elif defined __hppa__ |
193 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
194 | | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
195 | | #elif defined __ia64__ |
196 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory") |
197 | | #elif defined __m68k__ |
198 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
199 | | #elif defined __m88k__ |
200 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory") |
201 | | #elif defined __sh__ |
202 | | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
203 | | #endif |
204 | | #endif |
205 | | #endif |
206 | | |
207 | | #ifndef ECB_MEMORY_FENCE |
208 | | #if ECB_GCC_VERSION(4,7) |
209 | | /* see comment below (stdatomic.h) about the C11 memory model. */ |
210 | | #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) |
211 | | #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE) |
212 | | #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE) |
213 | | |
214 | | #elif ECB_CLANG_EXTENSION(c_atomic) |
215 | | /* see comment below (stdatomic.h) about the C11 memory model. */ |
216 | | #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) |
217 | | #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE) |
218 | | #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE) |
219 | | |
220 | | #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ |
221 | | #define ECB_MEMORY_FENCE __sync_synchronize () |
222 | | #elif _MSC_VER >= 1500 /* VC++ 2008 */ |
223 | | /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */ |
224 | | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
225 | | #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier() |
226 | | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */ |
227 | | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier() |
228 | | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
229 | | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
230 | | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
231 | | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
232 | | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
233 | | #elif defined _WIN32 |
234 | | #include <WinNT.h> |
235 | | #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ |
236 | | #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
237 | | #include <mbarrier.h> |
238 | | #define ECB_MEMORY_FENCE __machine_rw_barrier () |
239 | | #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier () |
240 | | #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier () |
241 | | #elif __xlC__ |
242 | | #define ECB_MEMORY_FENCE __sync () |
243 | | #endif |
244 | | #endif |
245 | | |
246 | | #ifndef ECB_MEMORY_FENCE |
247 | | #if ECB_C11 && !defined __STDC_NO_ATOMICS__ |
248 | | /* we assume that these memory fences work on all variables/all memory accesses, */ |
249 | | /* not just C11 atomics and atomic accesses */ |
250 | | #include <stdatomic.h> |
251 | | /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */ |
252 | | /* any fence other than seq_cst, which isn't very efficient for us. */ |
253 | | /* Why that is, we don't know - either the C11 memory model is quite useless */ |
254 | | /* for most usages, or gcc and clang have a bug */ |
255 | | /* I *currently* lean towards the latter, and inefficiently implement */ |
256 | | /* all three of ecb's fences as a seq_cst fence */ |
257 | | /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */ |
258 | | /* for all __atomic_thread_fence's except seq_cst */ |
259 | | #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) |
260 | | #endif |
261 | | #endif |
262 | | |
263 | | #ifndef ECB_MEMORY_FENCE |
264 | | #if !ECB_AVOID_PTHREADS |
265 | | /* |
266 | | * if you get undefined symbol references to pthread_mutex_lock, |
267 | | * or failure to find pthread.h, then you should implement |
268 | | * the ECB_MEMORY_FENCE operations for your cpu/compiler |
269 | | * OR provide pthread.h and link against the posix thread library |
270 | | * of your system. |
271 | | */ |
272 | | #include <pthread.h> |
273 | | #define ECB_NEEDS_PTHREADS 1 |
274 | | #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1 |
275 | | |
276 | | static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; |
277 | | #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) |
278 | | #endif |
279 | | #endif |
280 | | |
281 | | #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE |
282 | | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
283 | | #endif |
284 | | |
285 | | #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE |
286 | | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
287 | | #endif |
288 | | |
289 | | /*****************************************************************************/ |
290 | | |
291 | | #if ECB_CPP |
292 | | #define ecb_inline static inline |
293 | | #elif ECB_GCC_VERSION(2,5) |
294 | | #define ecb_inline static __inline__ |
295 | | #elif ECB_C99 |
296 | | #define ecb_inline static inline |
297 | | #else |
298 | | #define ecb_inline static |
299 | | #endif |
300 | | |
301 | | #if ECB_GCC_VERSION(3,3) |
302 | | #define ecb_restrict __restrict__ |
303 | | #elif ECB_C99 |
304 | | #define ecb_restrict restrict |
305 | | #else |
306 | | #define ecb_restrict |
307 | | #endif |
308 | | |
309 | | typedef int ecb_bool; |
310 | | |
311 | | #define ECB_CONCAT_(a, b) a ## b |
312 | | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
313 | | #define ECB_STRINGIFY_(a) # a |
314 | | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
315 | | #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr)) |
316 | | |
317 | | #define ecb_function_ ecb_inline |
318 | | |
319 | | #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8) |
320 | | #define ecb_attribute(attrlist) __attribute__ (attrlist) |
321 | | #else |
322 | | #define ecb_attribute(attrlist) |
323 | | #endif |
324 | | |
325 | | #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p) |
326 | | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
327 | | #else |
328 | | /* possible C11 impl for integral types |
329 | | typedef struct ecb_is_constant_struct ecb_is_constant_struct; |
330 | | #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */ |
331 | | |
332 | | #define ecb_is_constant(expr) 0 |
333 | | #endif |
334 | | |
335 | | #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect) |
336 | 0 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
337 | | #else |
338 | | #define ecb_expect(expr,value) (expr) |
339 | | #endif |
340 | | |
341 | | #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch) |
342 | | #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
343 | | #else |
344 | | #define ecb_prefetch(addr,rw,locality) |
345 | | #endif |
346 | | |
347 | | /* no emulation for ecb_decltype */ |
348 | | #if ECB_CPP11 |
349 | | // older implementations might have problems with decltype(x)::type, work around it |
350 | | template<class T> struct ecb_decltype_t { typedef T type; }; |
351 | | #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type |
352 | | #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8) |
353 | | #define ecb_decltype(x) __typeof__ (x) |
354 | | #endif |
355 | | |
356 | | #if _MSC_VER >= 1300 |
357 | | #define ecb_deprecated __declspec (deprecated) |
358 | | #else |
359 | | #define ecb_deprecated ecb_attribute ((__deprecated__)) |
360 | | #endif |
361 | | |
362 | | #if _MSC_VER >= 1500 |
363 | | #define ecb_deprecated_message(msg) __declspec (deprecated (msg)) |
364 | | #elif ECB_GCC_VERSION(4,5) |
365 | | #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg)) |
366 | | #else |
367 | | #define ecb_deprecated_message(msg) ecb_deprecated |
368 | | #endif |
369 | | |
370 | | #if _MSC_VER >= 1400 |
371 | | #define ecb_noinline __declspec (noinline) |
372 | | #else |
373 | | #define ecb_noinline ecb_attribute ((__noinline__)) |
374 | | #endif |
375 | | |
376 | | #define ecb_unused ecb_attribute ((__unused__)) |
377 | | #define ecb_const ecb_attribute ((__const__)) |
378 | | #define ecb_pure ecb_attribute ((__pure__)) |
379 | | |
380 | | #if ECB_C11 || __IBMC_NORETURN |
381 | | /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */ |
382 | | #define ecb_noreturn _Noreturn |
383 | | #elif ECB_CPP11 |
384 | | #define ecb_noreturn [[noreturn]] |
385 | | #elif _MSC_VER >= 1200 |
386 | | /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */ |
387 | | #define ecb_noreturn __declspec (noreturn) |
388 | | #else |
389 | | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
390 | | #endif |
391 | | |
392 | | #if ECB_GCC_VERSION(4,3) |
393 | | #define ecb_artificial ecb_attribute ((__artificial__)) |
394 | | #define ecb_hot ecb_attribute ((__hot__)) |
395 | | #define ecb_cold ecb_attribute ((__cold__)) |
396 | | #else |
397 | | #define ecb_artificial |
398 | | #define ecb_hot |
399 | | #define ecb_cold |
400 | | #endif |
401 | | |
402 | | /* put around conditional expressions if you are very sure that the */ |
403 | | /* expression is mostly true or mostly false. note that these return */ |
404 | | /* booleans, not the expression. */ |
405 | 0 | #define ecb_expect_false(expr) ecb_expect (!!(expr), 0) |
406 | 0 | #define ecb_expect_true(expr) ecb_expect (!!(expr), 1) |
407 | | /* for compatibility to the rest of the world */ |
408 | | #define ecb_likely(expr) ecb_expect_true (expr) |
409 | | #define ecb_unlikely(expr) ecb_expect_false (expr) |
410 | | |
411 | | /* count trailing zero bits and count # of one bits */ |
412 | | #if ECB_GCC_VERSION(3,4) \ |
413 | | || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \ |
414 | | && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \ |
415 | | && ECB_CLANG_BUILTIN(__builtin_popcount)) |
416 | | /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ |
417 | | #define ecb_ld32(x) (__builtin_clz (x) ^ 31) |
418 | | #define ecb_ld64(x) (__builtin_clzll (x) ^ 63) |
419 | | #define ecb_ctz32(x) __builtin_ctz (x) |
420 | | #define ecb_ctz64(x) __builtin_ctzll (x) |
421 | | #define ecb_popcount32(x) __builtin_popcount (x) |
422 | | /* no popcountll */ |
423 | | #else |
424 | | ecb_function_ ecb_const int ecb_ctz32 (uint32_t x); |
425 | | ecb_function_ ecb_const int |
426 | | ecb_ctz32 (uint32_t x) |
427 | | { |
428 | | int r = 0; |
429 | | |
430 | | x &= ~x + 1; /* this isolates the lowest bit */ |
431 | | |
432 | | #if ECB_branchless_on_i386 |
433 | | r += !!(x & 0xaaaaaaaa) << 0; |
434 | | r += !!(x & 0xcccccccc) << 1; |
435 | | r += !!(x & 0xf0f0f0f0) << 2; |
436 | | r += !!(x & 0xff00ff00) << 3; |
437 | | r += !!(x & 0xffff0000) << 4; |
438 | | #else |
439 | | if (x & 0xaaaaaaaa) r += 1; |
440 | | if (x & 0xcccccccc) r += 2; |
441 | | if (x & 0xf0f0f0f0) r += 4; |
442 | | if (x & 0xff00ff00) r += 8; |
443 | | if (x & 0xffff0000) r += 16; |
444 | | #endif |
445 | | |
446 | | return r; |
447 | | } |
448 | | |
449 | | ecb_function_ ecb_const int ecb_ctz64 (uint64_t x); |
450 | | ecb_function_ ecb_const int |
451 | | ecb_ctz64 (uint64_t x) |
452 | | { |
453 | | int shift = x & 0xffffffffU ? 0 : 32; |
454 | | return ecb_ctz32 (x >> shift) + shift; |
455 | | } |
456 | | |
457 | | ecb_function_ ecb_const int ecb_popcount32 (uint32_t x); |
458 | | ecb_function_ ecb_const int |
459 | | ecb_popcount32 (uint32_t x) |
460 | | { |
461 | | x -= (x >> 1) & 0x55555555; |
462 | | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
463 | | x = ((x >> 4) + x) & 0x0f0f0f0f; |
464 | | x *= 0x01010101; |
465 | | |
466 | | return x >> 24; |
467 | | } |
468 | | |
469 | | ecb_function_ ecb_const int ecb_ld32 (uint32_t x); |
470 | | ecb_function_ ecb_const int ecb_ld32 (uint32_t x) |
471 | | { |
472 | | int r = 0; |
473 | | |
474 | | if (x >> 16) { x >>= 16; r += 16; } |
475 | | if (x >> 8) { x >>= 8; r += 8; } |
476 | | if (x >> 4) { x >>= 4; r += 4; } |
477 | | if (x >> 2) { x >>= 2; r += 2; } |
478 | | if (x >> 1) { r += 1; } |
479 | | |
480 | | return r; |
481 | | } |
482 | | |
483 | | ecb_function_ ecb_const int ecb_ld64 (uint64_t x); |
484 | | ecb_function_ ecb_const int ecb_ld64 (uint64_t x) |
485 | | { |
486 | | int r = 0; |
487 | | |
488 | | if (x >> 32) { x >>= 32; r += 32; } |
489 | | |
490 | | return r + ecb_ld32 (x); |
491 | | } |
492 | | #endif |
493 | | |
494 | | ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x); |
495 | 0 | ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); } |
496 | | ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x); |
497 | 0 | ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); } |
498 | | |
499 | | ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x); |
500 | | ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x) |
501 | 0 | { |
502 | 0 | return ( (x * 0x0802U & 0x22110U) |
503 | 0 | | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; |
504 | 0 | } |
505 | | |
506 | | ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x); |
507 | | ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x) |
508 | 0 | { |
509 | 0 | x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1); |
510 | 0 | x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2); |
511 | 0 | x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4); |
512 | 0 | x = ( x >> 8 ) | ( x << 8); |
513 | 0 |
|
514 | 0 | return x; |
515 | 0 | } |
516 | | |
517 | | ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x); |
518 | | ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x) |
519 | 0 | { |
520 | 0 | x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1); |
521 | 0 | x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2); |
522 | 0 | x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4); |
523 | 0 | x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8); |
524 | 0 | x = ( x >> 16 ) | ( x << 16); |
525 | 0 |
|
526 | 0 | return x; |
527 | 0 | } |
528 | | |
529 | | /* popcount64 is only available on 64 bit cpus as gcc builtin */ |
530 | | /* so for this version we are lazy */ |
531 | | ecb_function_ ecb_const int ecb_popcount64 (uint64_t x); |
532 | | ecb_function_ ecb_const int |
533 | | ecb_popcount64 (uint64_t x) |
534 | 0 | { |
535 | 0 | return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); |
536 | 0 | } |
537 | | |
538 | | ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count); |
539 | | ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count); |
540 | | ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count); |
541 | | ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count); |
542 | | ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count); |
543 | | ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count); |
544 | | ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count); |
545 | | ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count); |
546 | | |
547 | 0 | ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } |
548 | 0 | ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } |
549 | 0 | ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } |
550 | 0 | ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } |
551 | 0 | ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } |
552 | 0 | ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } |
553 | 0 | ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } |
554 | 0 | ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } |
555 | | |
556 | | #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64)) |
557 | | #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16) |
558 | | #define ecb_bswap16(x) __builtin_bswap16 (x) |
559 | | #else |
560 | | #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) |
561 | | #endif |
562 | | #define ecb_bswap32(x) __builtin_bswap32 (x) |
563 | | #define ecb_bswap64(x) __builtin_bswap64 (x) |
564 | | #elif _MSC_VER |
565 | | #include <stdlib.h> |
566 | | #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x))) |
567 | | #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x))) |
568 | | #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x))) |
569 | | #else |
570 | | ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x); |
571 | | ecb_function_ ecb_const uint16_t |
572 | | ecb_bswap16 (uint16_t x) |
573 | | { |
574 | | return ecb_rotl16 (x, 8); |
575 | | } |
576 | | |
577 | | ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x); |
578 | | ecb_function_ ecb_const uint32_t |
579 | | ecb_bswap32 (uint32_t x) |
580 | | { |
581 | | return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); |
582 | | } |
583 | | |
584 | | ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x); |
585 | | ecb_function_ ecb_const uint64_t |
586 | | ecb_bswap64 (uint64_t x) |
587 | | { |
588 | | return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); |
589 | | } |
590 | | #endif |
591 | | |
592 | | #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable) |
593 | | #define ecb_unreachable() __builtin_unreachable () |
594 | | #else |
595 | | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
596 | | ecb_inline ecb_noreturn void ecb_unreachable (void); |
597 | | ecb_inline ecb_noreturn void ecb_unreachable (void) { } |
598 | | #endif |
599 | | |
600 | | /* try to tell the compiler that some condition is definitely true */ |
601 | | #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0 |
602 | | |
603 | | ecb_inline ecb_const unsigned char ecb_byteorder_helper (void); |
604 | | ecb_inline ecb_const unsigned char |
605 | | ecb_byteorder_helper (void) |
606 | 0 | { |
607 | 0 | /* the union code still generates code under pressure in gcc, */ |
608 | 0 | /* but less than using pointers, and always seems to */ |
609 | 0 | /* successfully return a constant. */ |
610 | 0 | /* the reason why we have this horrible preprocessor mess */ |
611 | 0 | /* is to avoid it in all cases, at least on common architectures */ |
612 | 0 | /* or when using a recent enough gcc version (>= 4.6) */ |
613 | 0 | #if ((__i386 || __i386__) && !__VOS__) || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64 |
614 | 0 | return 0x44; |
615 | 0 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
616 | 0 | return 0x44; |
617 | 0 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
618 | 0 | return 0x11; |
619 | 0 | #else |
620 | 0 | union |
621 | 0 | { |
622 | 0 | uint32_t i; |
623 | 0 | uint8_t c; |
624 | 0 | } u = { 0x11223344 }; |
625 | 0 | return u.c; |
626 | 0 | #endif |
627 | 0 | } |
628 | | |
629 | | ecb_inline ecb_const ecb_bool ecb_big_endian (void); |
630 | 0 | ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
631 | | ecb_inline ecb_const ecb_bool ecb_little_endian (void); |
632 | 0 | ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
633 | | |
634 | | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
635 | | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
636 | | #else |
637 | | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
638 | | #endif |
639 | | |
640 | | #if ECB_CPP |
641 | | template<typename T> |
642 | | static inline T ecb_div_rd (T val, T div) |
643 | | { |
644 | | return val < 0 ? - ((-val + div - 1) / div) : (val ) / div; |
645 | | } |
646 | | template<typename T> |
647 | | static inline T ecb_div_ru (T val, T div) |
648 | | { |
649 | | return val < 0 ? - ((-val ) / div) : (val + div - 1) / div; |
650 | | } |
651 | | #else |
652 | | #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div)) |
653 | | #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div)) |
654 | | #endif |
655 | | |
656 | | #if ecb_cplusplus_does_not_suck |
657 | | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
658 | | template<typename T, int N> |
659 | | static inline int ecb_array_length (const T (&arr)[N]) |
660 | | { |
661 | | return N; |
662 | | } |
663 | | #else |
664 | | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
665 | | #endif |
666 | | |
667 | | /*******************************************************************************/ |
668 | | /* floating point stuff, can be disabled by defining ECB_NO_LIBM */ |
669 | | |
670 | | /* basically, everything uses "ieee pure-endian" floating point numbers */ |
671 | | /* the only noteworthy exception is ancient armle, which uses order 43218765 */ |
672 | | #if 0 \ |
673 | | || __i386 || __i386__ \ |
674 | | || ECB_GCC_AMD64 \ |
675 | | || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \ |
676 | | || defined __s390__ || defined __s390x__ \ |
677 | | || defined __mips__ \ |
678 | | || defined __alpha__ \ |
679 | | || defined __hppa__ \ |
680 | | || defined __ia64__ \ |
681 | | || defined __m68k__ \ |
682 | | || defined __m88k__ \ |
683 | | || defined __sh__ \ |
684 | | || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \ |
685 | | || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \ |
686 | | || defined __aarch64__ |
687 | | #define ECB_STDFP 1 |
688 | | #include <string.h> /* for memcpy */ |
689 | | #else |
690 | | #define ECB_STDFP 0 |
691 | | #endif |
692 | | |
693 | | #ifndef ECB_NO_LIBM |
694 | | |
695 | | #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */ |
696 | | |
697 | | /* only the oldest of old doesn't have this one. solaris. */ |
698 | | #ifdef INFINITY |
699 | | #define ECB_INFINITY INFINITY |
700 | | #else |
701 | | #define ECB_INFINITY HUGE_VAL |
702 | | #endif |
703 | | |
704 | | #ifdef NAN |
705 | | #define ECB_NAN NAN |
706 | | #else |
707 | | #define ECB_NAN ECB_INFINITY |
708 | | #endif |
709 | | |
710 | | #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L |
711 | | #define ecb_ldexpf(x,e) ldexpf ((x), (e)) |
712 | | #define ecb_frexpf(x,e) frexpf ((x), (e)) |
713 | | #else |
714 | | #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e)) |
715 | | #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e)) |
716 | | #endif |
717 | | |
718 | | /* converts an ieee half/binary16 to a float */ |
719 | | ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x); |
720 | | ecb_function_ ecb_const float |
721 | | ecb_binary16_to_float (uint16_t x) |
722 | 0 | { |
723 | 0 | int e = (x >> 10) & 0x1f; |
724 | 0 | int m = x & 0x3ff; |
725 | 0 | float r; |
726 | 0 |
|
727 | 0 | if (!e ) r = ecb_ldexpf (m , -24); |
728 | 0 | else if (e != 31) r = ecb_ldexpf (m + 0x400, e - 25); |
729 | 0 | else if (m ) r = ECB_NAN; |
730 | 0 | else r = ECB_INFINITY; |
731 | 0 |
|
732 | 0 | return x & 0x8000 ? -r : r; |
733 | 0 | } |
734 | | |
735 | | /* convert a float to ieee single/binary32 */ |
736 | | ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x); |
737 | | ecb_function_ ecb_const uint32_t |
738 | | ecb_float_to_binary32 (float x) |
739 | 0 | { |
740 | 0 | uint32_t r; |
741 | 0 |
|
742 | 0 | #if ECB_STDFP |
743 | 0 | memcpy (&r, &x, 4); |
744 | 0 | #else |
745 | 0 | /* slow emulation, works for anything but -0 */ |
746 | 0 | uint32_t m; |
747 | 0 | int e; |
748 | 0 |
|
749 | 0 | if (x == 0e0f ) return 0x00000000U; |
750 | 0 | if (x > +3.40282346638528860e+38f) return 0x7f800000U; |
751 | 0 | if (x < -3.40282346638528860e+38f) return 0xff800000U; |
752 | 0 | if (x != x ) return 0x7fbfffffU; |
753 | 0 |
|
754 | 0 | m = ecb_frexpf (x, &e) * 0x1000000U; |
755 | 0 |
|
756 | 0 | r = m & 0x80000000U; |
757 | 0 |
|
758 | 0 | if (r) |
759 | 0 | m = -m; |
760 | 0 |
|
761 | 0 | if (e <= -126) |
762 | 0 | { |
763 | 0 | m &= 0xffffffU; |
764 | 0 | m >>= (-125 - e); |
765 | 0 | e = -126; |
766 | 0 | } |
767 | 0 |
|
768 | 0 | r |= (e + 126) << 23; |
769 | 0 | r |= m & 0x7fffffU; |
770 | 0 | #endif |
771 | 0 |
|
772 | 0 | return r; |
773 | 0 | } |
774 | | |
775 | | /* converts an ieee single/binary32 to a float */ |
776 | | ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x); |
777 | | ecb_function_ ecb_const float |
778 | | ecb_binary32_to_float (uint32_t x) |
779 | 0 | { |
780 | 0 | float r; |
781 | 0 |
|
782 | 0 | #if ECB_STDFP |
783 | 0 | memcpy (&r, &x, 4); |
784 | 0 | #else |
785 | 0 | /* emulation, only works for normals and subnormals and +0 */ |
786 | 0 | int neg = x >> 31; |
787 | 0 | int e = (x >> 23) & 0xffU; |
788 | 0 |
|
789 | 0 | x &= 0x7fffffU; |
790 | 0 |
|
791 | 0 | if (e) |
792 | 0 | x |= 0x800000U; |
793 | 0 | else |
794 | 0 | e = 1; |
795 | 0 |
|
796 | 0 | /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ |
797 | 0 | r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126); |
798 | 0 |
|
799 | 0 | r = neg ? -r : r; |
800 | 0 | #endif |
801 | 0 |
|
802 | 0 | return r; |
803 | 0 | } |
804 | | |
805 | | /* convert a double to ieee double/binary64 */ |
806 | | ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x); |
807 | | ecb_function_ ecb_const uint64_t |
808 | | ecb_double_to_binary64 (double x) |
809 | 0 | { |
810 | 0 | uint64_t r; |
811 | 0 |
|
812 | 0 | #if ECB_STDFP |
813 | 0 | memcpy (&r, &x, 8); |
814 | 0 | #else |
815 | 0 | /* slow emulation, works for anything but -0 */ |
816 | 0 | uint64_t m; |
817 | 0 | int e; |
818 | 0 |
|
819 | 0 | if (x == 0e0 ) return 0x0000000000000000U; |
820 | 0 | if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U; |
821 | 0 | if (x < -1.79769313486231470e+308) return 0xfff0000000000000U; |
822 | 0 | if (x != x ) return 0X7ff7ffffffffffffU; |
823 | 0 |
|
824 | 0 | m = frexp (x, &e) * 0x20000000000000U; |
825 | 0 |
|
826 | 0 | r = m & 0x8000000000000000;; |
827 | 0 |
|
828 | 0 | if (r) |
829 | 0 | m = -m; |
830 | 0 |
|
831 | 0 | if (e <= -1022) |
832 | 0 | { |
833 | 0 | m &= 0x1fffffffffffffU; |
834 | 0 | m >>= (-1021 - e); |
835 | 0 | e = -1022; |
836 | 0 | } |
837 | 0 |
|
838 | 0 | r |= ((uint64_t)(e + 1022)) << 52; |
839 | 0 | r |= m & 0xfffffffffffffU; |
840 | 0 | #endif |
841 | 0 |
|
842 | 0 | return r; |
843 | 0 | } |
844 | | |
845 | | /* converts an ieee double/binary64 to a double */ |
846 | | ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x); |
847 | | ecb_function_ ecb_const double |
848 | | ecb_binary64_to_double (uint64_t x) |
849 | 0 | { |
850 | 0 | double r; |
851 | 0 |
|
852 | 0 | #if ECB_STDFP |
853 | 0 | memcpy (&r, &x, 8); |
854 | 0 | #else |
855 | 0 | /* emulation, only works for normals and subnormals and +0 */ |
856 | 0 | int neg = x >> 63; |
857 | 0 | int e = (x >> 52) & 0x7ffU; |
858 | 0 |
|
859 | 0 | x &= 0xfffffffffffffU; |
860 | 0 |
|
861 | 0 | if (e) |
862 | 0 | x |= 0x10000000000000U; |
863 | 0 | else |
864 | 0 | e = 1; |
865 | 0 |
|
866 | 0 | /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */ |
867 | 0 | r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022); |
868 | 0 |
|
869 | 0 | r = neg ? -r : r; |
870 | 0 | #endif |
871 | 0 |
|
872 | 0 | return r; |
873 | 0 | } |
874 | | |
875 | | #endif |
876 | | |
877 | | #endif |
878 | | |