ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libecb/ecb.h
Revision: 1.171
Committed: Tue Nov 24 19:46:20 2015 UTC (8 years, 6 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.170: +28 -0 lines
Log Message:
*** empty log message ***

File Contents

# User Rev Content
1 root 1.1 /*
2 root 1.17 * libecb - http://software.schmorp.de/pkg/libecb
3 root 1.1 *
4 root 1.152 * Copyright (©) 2009-2015 Marc Alexander Lehmann <libecb@schmorp.de>
5 root 1.7 * Copyright (©) 2011 Emanuele Giaquinta
6 root 1.1 * 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 root 1.133 *
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 root 1.1 */
40    
41     #ifndef ECB_H
42     #define ECB_H
43    
44 root 1.87 /* 16 bits major, 16 bits minor */
45 root 1.167 #define ECB_VERSION 0x00010005
46 root 1.87
47 root 1.44 #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 root 1.51 #else /* _MSC_VER || __BORLANDC__ */
58 root 1.44 typedef signed __int64 int64_t;
59     typedef unsigned __int64 uint64_t;
60     #endif
61 root 1.87 #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 root 1.44 #else
71     #include <inttypes.h>
72 root 1.87 #if UINTMAX_MAX > 0xffffffffU
73     #define ECB_PTRSIZE 8
74     #else
75     #define ECB_PTRSIZE 4
76     #endif
77 root 1.44 #endif
78 root 1.6
79 sf-exg 1.159 #define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
80     #define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)
81    
82 root 1.114 /* work around x32 idiocy by defining proper macros */
83 sf-exg 1.159 #if ECB_GCC_AMD64 || ECB_MSVC_AMD64
84 root 1.119 #if _ILP32
85 root 1.115 #define ECB_AMD64_X32 1
86 root 1.114 #else
87 root 1.115 #define ECB_AMD64 1
88 root 1.114 #endif
89     #endif
90    
91 root 1.12 /* many compilers define _GNUC_ to some versions but then only implement
92     * what their idiot authors think are the "more important" extensions,
93 sf-exg 1.59 * causing enormous grief in return for some better fake benchmark numbers.
94 root 1.18 * or so.
95 root 1.12 * 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 root 1.137 #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 root 1.12 #endif
103 root 1.1
104 sf-exg 1.138 #define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
105    
106 root 1.147 #if __clang__ && defined __has_builtin
107     #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
108 sf-exg 1.138 #else
109     #define ECB_CLANG_BUILTIN(x) 0
110     #endif
111    
112 root 1.147 #if __clang__ && defined __has_extension
113     #define ECB_CLANG_EXTENSION(x) __has_extension (x)
114 sf-exg 1.140 #else
115     #define ECB_CLANG_EXTENSION(x) 0
116     #endif
117    
118 root 1.91 #define ECB_CPP (__cplusplus+0)
119     #define ECB_CPP11 (__cplusplus >= 201103L)
120 root 1.90
121 root 1.102 #if ECB_CPP
122 root 1.127 #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 root 1.102 #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 root 1.52 /*****************************************************************************/
143    
144 root 1.58 /* 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 root 1.79 #if ECB_NO_THREADS
148 root 1.95 #define ECB_NO_SMP 1
149 root 1.79 #endif
150    
151 root 1.93 #if ECB_NO_SMP
152 root 1.64 #define ECB_MEMORY_FENCE do { } while (0)
153 root 1.58 #endif
154    
155 sf-exg 1.165 /* 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 root 1.171 #if 1400 <= _MSC_VER
161     #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
162     #endif
163    
164 root 1.52 #ifndef ECB_MEMORY_FENCE
165 root 1.85 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
166 root 1.73 #if __i386 || __i386__
167 root 1.54 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
168 root 1.94 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
169     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
170 sf-exg 1.159 #elif ECB_GCC_AMD64
171 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
172     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
173     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
174 root 1.63 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
175 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
176 root 1.85 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
177     || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
178 root 1.84 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
179 root 1.85 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
180 root 1.94 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
181     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
182 root 1.129 #elif __aarch64__
183     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
184 root 1.166 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
185 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
186     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
187     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
188 root 1.85 #elif defined __s390__ || defined __s390x__
189 root 1.77 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
190 root 1.85 #elif defined __mips__
191 root 1.118 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
192 root 1.116 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
193     #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
194 root 1.86 #elif defined __alpha__
195 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
196     #elif defined __hppa__
197     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
198     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
199     #elif defined __ia64__
200     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
201 root 1.117 #elif defined __m68k__
202     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
203     #elif defined __m88k__
204     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
205     #elif defined __sh__
206     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
207 root 1.52 #endif
208     #endif
209     #endif
210    
211     #ifndef ECB_MEMORY_FENCE
212 root 1.93 #if ECB_GCC_VERSION(4,7)
213 root 1.97 /* see comment below (stdatomic.h) about the C11 memory model. */
214 root 1.93 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
215 root 1.128 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
216     #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
217 root 1.110
218 sf-exg 1.140 #elif ECB_CLANG_EXTENSION(c_atomic)
219     /* see comment below (stdatomic.h) about the C11 memory model. */
220     #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
221     #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
222     #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
223 root 1.110
224 root 1.93 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
225 root 1.52 #define ECB_MEMORY_FENCE __sync_synchronize ()
226 root 1.126 #elif _MSC_VER >= 1500 /* VC++ 2008 */
227     /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
228     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
229     #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
230     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
231     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
232 root 1.57 #elif _MSC_VER >= 1400 /* VC++ 2005 */
233     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
234     #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
235     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
236     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
237 root 1.85 #elif defined _WIN32
238 root 1.55 #include <WinNT.h>
239 root 1.57 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
240 root 1.72 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
241     #include <mbarrier.h>
242     #define ECB_MEMORY_FENCE __machine_rw_barrier ()
243     #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
244     #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
245 root 1.82 #elif __xlC__
246 root 1.83 #define ECB_MEMORY_FENCE __sync ()
247 root 1.52 #endif
248     #endif
249    
250 root 1.53 #ifndef ECB_MEMORY_FENCE
251 root 1.94 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
252     /* we assume that these memory fences work on all variables/all memory accesses, */
253     /* not just C11 atomics and atomic accesses */
254     #include <stdatomic.h>
255 root 1.97 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
256     /* any fence other than seq_cst, which isn't very efficient for us. */
257     /* Why that is, we don't know - either the C11 memory model is quite useless */
258     /* for most usages, or gcc and clang have a bug */
259     /* I *currently* lean towards the latter, and inefficiently implement */
260     /* all three of ecb's fences as a seq_cst fence */
261 root 1.128 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
262     /* for all __atomic_thread_fence's except seq_cst */
263 root 1.94 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
264     #endif
265     #endif
266    
267     #ifndef ECB_MEMORY_FENCE
268 root 1.62 #if !ECB_AVOID_PTHREADS
269     /*
270     * if you get undefined symbol references to pthread_mutex_lock,
271     * or failure to find pthread.h, then you should implement
272     * the ECB_MEMORY_FENCE operations for your cpu/compiler
273     * OR provide pthread.h and link against the posix thread library
274     * of your system.
275     */
276     #include <pthread.h>
277     #define ECB_NEEDS_PTHREADS 1
278     #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
279 root 1.52
280 root 1.62 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
281     #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
282     #endif
283     #endif
284    
285 root 1.85 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
286 root 1.52 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
287 root 1.62 #endif
288    
289 root 1.85 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
290 root 1.52 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
291     #endif
292    
293     /*****************************************************************************/
294    
295 root 1.149 #if ECB_CPP
296 root 1.46 #define ecb_inline static inline
297 root 1.38 #elif ECB_GCC_VERSION(2,5)
298 root 1.46 #define ecb_inline static __inline__
299 root 1.39 #elif ECB_C99
300 root 1.46 #define ecb_inline static inline
301 root 1.29 #else
302 root 1.46 #define ecb_inline static
303 root 1.38 #endif
304    
305     #if ECB_GCC_VERSION(3,3)
306     #define ecb_restrict __restrict__
307 root 1.39 #elif ECB_C99
308 root 1.38 #define ecb_restrict restrict
309     #else
310     #define ecb_restrict
311 root 1.4 #endif
312    
313 root 1.38 typedef int ecb_bool;
314    
315 root 1.8 #define ECB_CONCAT_(a, b) a ## b
316     #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
317     #define ECB_STRINGIFY_(a) # a
318     #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
319 root 1.155 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
320 root 1.8
321 root 1.46 #define ecb_function_ ecb_inline
322 root 1.3
323 sf-exg 1.138 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
324 root 1.142 #define ecb_attribute(attrlist) __attribute__ (attrlist)
325 root 1.37 #else
326     #define ecb_attribute(attrlist)
327 sf-exg 1.138 #endif
328 root 1.127
329 sf-exg 1.138 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
330     #define ecb_is_constant(expr) __builtin_constant_p (expr)
331     #else
332 root 1.127 /* possible C11 impl for integral types
333     typedef struct ecb_is_constant_struct ecb_is_constant_struct;
334     #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
335    
336 root 1.37 #define ecb_is_constant(expr) 0
337 sf-exg 1.138 #endif
338    
339     #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
340     #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
341     #else
342 root 1.37 #define ecb_expect(expr,value) (expr)
343 sf-exg 1.138 #endif
344    
345     #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
346     #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
347     #else
348 root 1.37 #define ecb_prefetch(addr,rw,locality)
349 root 1.1 #endif
350    
351 root 1.2 /* no emulation for ecb_decltype */
352 root 1.143 #if ECB_CPP11
353 root 1.144 // older implementations might have problems with decltype(x)::type, work around it
354 root 1.146 template<class T> struct ecb_decltype_t { typedef T type; };
355     #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
356 root 1.143 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
357     #define ecb_decltype(x) __typeof__ (x)
358 root 1.1 #endif
359    
360 root 1.135 #if _MSC_VER >= 1300
361 root 1.149 #define ecb_deprecated __declspec (deprecated)
362 root 1.135 #else
363     #define ecb_deprecated ecb_attribute ((__deprecated__))
364     #endif
365    
366 sf-exg 1.162 #if _MSC_VER >= 1500
367 root 1.154 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
368     #elif ECB_GCC_VERSION(4,5)
369     #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
370     #else
371     #define ecb_deprecated_message(msg) ecb_deprecated
372     #endif
373    
374     #if _MSC_VER >= 1400
375     #define ecb_noinline __declspec (noinline)
376     #else
377     #define ecb_noinline ecb_attribute ((__noinline__))
378     #endif
379    
380 root 1.24 #define ecb_unused ecb_attribute ((__unused__))
381     #define ecb_const ecb_attribute ((__const__))
382     #define ecb_pure ecb_attribute ((__pure__))
383 root 1.35
384 root 1.145 #if ECB_C11 || __IBMC_NORETURN
385 sf-exg 1.165 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
386 root 1.90 #define ecb_noreturn _Noreturn
387 root 1.153 #elif ECB_CPP11
388     #define ecb_noreturn [[noreturn]]
389     #elif _MSC_VER >= 1200
390 sf-exg 1.156 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
391 root 1.153 #define ecb_noreturn __declspec (noreturn)
392 root 1.90 #else
393     #define ecb_noreturn ecb_attribute ((__noreturn__))
394     #endif
395    
396 root 1.35 #if ECB_GCC_VERSION(4,3)
397 root 1.39 #define ecb_artificial ecb_attribute ((__artificial__))
398     #define ecb_hot ecb_attribute ((__hot__))
399     #define ecb_cold ecb_attribute ((__cold__))
400 root 1.35 #else
401     #define ecb_artificial
402     #define ecb_hot
403     #define ecb_cold
404     #endif
405 root 1.1
406 root 1.39 /* put around conditional expressions if you are very sure that the */
407     /* expression is mostly true or mostly false. note that these return */
408     /* booleans, not the expression. */
409 root 1.33 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
410     #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
411 root 1.36 /* for compatibility to the rest of the world */
412 root 1.33 #define ecb_likely(expr) ecb_expect_true (expr)
413     #define ecb_unlikely(expr) ecb_expect_false (expr)
414 root 1.1
415 root 1.3 /* count trailing zero bits and count # of one bits */
416 root 1.139 #if ECB_GCC_VERSION(3,4) \
417     || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
418     && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
419     && ECB_CLANG_BUILTIN(__builtin_popcount))
420 root 1.49 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
421     #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
422     #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
423 root 1.35 #define ecb_ctz32(x) __builtin_ctz (x)
424 root 1.49 #define ecb_ctz64(x) __builtin_ctzll (x)
425 root 1.35 #define ecb_popcount32(x) __builtin_popcount (x)
426 root 1.49 /* no popcountll */
427 root 1.1 #else
428 root 1.151 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
429     ecb_function_ ecb_const int
430 root 1.35 ecb_ctz32 (uint32_t x)
431     {
432 root 1.171 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
433     unsigned long r = 0;
434     _BitScanForward (&r, x);
435     return (int)r;
436     #else
437 root 1.35 int r = 0;
438    
439 root 1.48 x &= ~x + 1; /* this isolates the lowest bit */
440 root 1.35
441 root 1.50 #if ECB_branchless_on_i386
442     r += !!(x & 0xaaaaaaaa) << 0;
443     r += !!(x & 0xcccccccc) << 1;
444     r += !!(x & 0xf0f0f0f0) << 2;
445     r += !!(x & 0xff00ff00) << 3;
446     r += !!(x & 0xffff0000) << 4;
447     #else
448 root 1.35 if (x & 0xaaaaaaaa) r += 1;
449     if (x & 0xcccccccc) r += 2;
450     if (x & 0xf0f0f0f0) r += 4;
451     if (x & 0xff00ff00) r += 8;
452     if (x & 0xffff0000) r += 16;
453 root 1.50 #endif
454 root 1.35
455     return r;
456 root 1.171 #endif
457 root 1.35 }
458    
459 root 1.151 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
460     ecb_function_ ecb_const int
461 root 1.49 ecb_ctz64 (uint64_t x)
462     {
463 root 1.171 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
464     unsigned long r = 0;
465     _BitScanForward64 (&r, x);
466     return (int)r;
467     #else
468 root 1.168 int shift = x & 0xffffffff ? 0 : 32;
469 root 1.50 return ecb_ctz32 (x >> shift) + shift;
470 root 1.171 #endif
471 root 1.49 }
472    
473 root 1.151 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
474     ecb_function_ ecb_const int
475 root 1.35 ecb_popcount32 (uint32_t x)
476     {
477     x -= (x >> 1) & 0x55555555;
478     x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
479     x = ((x >> 4) + x) & 0x0f0f0f0f;
480     x *= 0x01010101;
481 root 1.1
482 root 1.35 return x >> 24;
483     }
484 root 1.49
485 root 1.151 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
486     ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
487 root 1.49 {
488 root 1.171 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
489     unsigned long r = 0;
490     _BitScanReverse (&r, x);
491     return (int)r;
492     #else
493 root 1.50 int r = 0;
494 root 1.49
495 root 1.50 if (x >> 16) { x >>= 16; r += 16; }
496     if (x >> 8) { x >>= 8; r += 8; }
497     if (x >> 4) { x >>= 4; r += 4; }
498     if (x >> 2) { x >>= 2; r += 2; }
499     if (x >> 1) { r += 1; }
500 root 1.49
501     return r;
502 root 1.171 #endif
503 root 1.49 }
504    
505 root 1.151 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
506     ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
507 root 1.49 {
508 root 1.171 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
509     unsigned long r = 0;
510     _BitScanReverse64 (&r, x);
511     return (int)r;
512     #else
513 root 1.50 int r = 0;
514 root 1.49
515 root 1.50 if (x >> 32) { x >>= 32; r += 32; }
516 root 1.49
517 root 1.50 return r + ecb_ld32 (x);
518 root 1.171 #endif
519 root 1.49 }
520 root 1.1 #endif
521    
522 root 1.151 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
523     ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
524     ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
525     ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
526 root 1.88
527 root 1.151 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
528     ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
529 root 1.70 {
530     return ( (x * 0x0802U & 0x22110U)
531 root 1.151 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
532 root 1.70 }
533    
534 root 1.151 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
535     ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
536 root 1.70 {
537     x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
538     x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
539     x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
540     x = ( x >> 8 ) | ( x << 8);
541    
542     return x;
543     }
544    
545 root 1.151 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
546     ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
547 root 1.70 {
548     x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
549     x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
550     x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
551     x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
552     x = ( x >> 16 ) | ( x << 16);
553    
554     return x;
555     }
556    
557 root 1.49 /* popcount64 is only available on 64 bit cpus as gcc builtin */
558     /* so for this version we are lazy */
559 root 1.151 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
560     ecb_function_ ecb_const int
561 root 1.49 ecb_popcount64 (uint64_t x)
562     {
563     return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
564     }
565    
566 root 1.151 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
567     ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
568     ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
569     ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
570     ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
571     ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
572     ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
573     ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
574    
575     ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
576     ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
577     ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
578     ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
579     ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
580     ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
581     ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
582     ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
583 root 1.50
584 sf-exg 1.138 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
585 root 1.164 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
586     #define ecb_bswap16(x) __builtin_bswap16 (x)
587     #else
588 root 1.49 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
589 root 1.164 #endif
590 root 1.49 #define ecb_bswap32(x) __builtin_bswap32 (x)
591     #define ecb_bswap64(x) __builtin_bswap64 (x)
592 root 1.164 #elif _MSC_VER
593     #include <stdlib.h>
594     #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
595     #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
596     #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
597 root 1.13 #else
598 root 1.151 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
599     ecb_function_ ecb_const uint16_t
600 root 1.50 ecb_bswap16 (uint16_t x)
601 root 1.49 {
602 root 1.50 return ecb_rotl16 (x, 8);
603 root 1.49 }
604    
605 root 1.151 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
606     ecb_function_ ecb_const uint32_t
607 root 1.35 ecb_bswap32 (uint32_t x)
608     {
609 root 1.50 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
610 root 1.35 }
611    
612 root 1.151 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
613     ecb_function_ ecb_const uint64_t
614 root 1.49 ecb_bswap64 (uint64_t x)
615 root 1.35 {
616 root 1.50 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
617 root 1.35 }
618 root 1.13 #endif
619    
620 sf-exg 1.138 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
621 root 1.35 #define ecb_unreachable() __builtin_unreachable ()
622 root 1.13 #else
623 root 1.35 /* this seems to work fine, but gcc always emits a warning for it :/ */
624 root 1.151 ecb_inline ecb_noreturn void ecb_unreachable (void);
625     ecb_inline ecb_noreturn void ecb_unreachable (void) { }
626 root 1.13 #endif
627    
628 root 1.41 /* try to tell the compiler that some condition is definitely true */
629 root 1.100 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
630 root 1.41
631 root 1.151 ecb_inline ecb_const unsigned char ecb_byteorder_helper (void);
632     ecb_inline ecb_const unsigned char
633 root 1.23 ecb_byteorder_helper (void)
634 root 1.3 {
635 root 1.98 /* the union code still generates code under pressure in gcc, */
636 sf-exg 1.111 /* but less than using pointers, and always seems to */
637 root 1.98 /* successfully return a constant. */
638     /* the reason why we have this horrible preprocessor mess */
639 root 1.99 /* is to avoid it in all cases, at least on common architectures */
640 sf-exg 1.111 /* or when using a recent enough gcc version (>= 4.6) */
641 sf-exg 1.159 #if ((__i386 || __i386__) && !__VOS__) || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64
642 root 1.98 return 0x44;
643     #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
644     return 0x44;
645     #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
646 root 1.113 return 0x11;
647 root 1.98 #else
648     union
649     {
650     uint32_t i;
651     uint8_t c;
652     } u = { 0x11223344 };
653     return u.c;
654     #endif
655 root 1.3 }
656    
657 root 1.151 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
658     ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
659     ecb_inline ecb_const ecb_bool ecb_little_endian (void);
660     ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
661 root 1.3
662 root 1.39 #if ECB_GCC_VERSION(3,0) || ECB_C99
663 root 1.35 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
664 root 1.31 #else
665 root 1.35 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
666 root 1.31 #endif
667 root 1.21
668 root 1.149 #if ECB_CPP
669 sf-exg 1.68 template<typename T>
670     static inline T ecb_div_rd (T val, T div)
671     {
672     return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
673     }
674     template<typename T>
675     static inline T ecb_div_ru (T val, T div)
676     {
677     return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
678     }
679     #else
680     #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
681     #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
682     #endif
683 sf-exg 1.67
684 root 1.5 #if ecb_cplusplus_does_not_suck
685 root 1.40 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
686 root 1.35 template<typename T, int N>
687     static inline int ecb_array_length (const T (&arr)[N])
688     {
689     return N;
690     }
691 root 1.5 #else
692 root 1.35 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
693 root 1.5 #endif
694    
695 root 1.170 ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
696 root 1.167 ecb_function_ ecb_const uint32_t
697 root 1.170 ecb_binary16_to_binary32 (uint32_t x)
698 root 1.167 {
699     unsigned int s = (x & 0x8000) << (31 - 15);
700     int e = (x >> 10) & 0x001f;
701     unsigned int m = x & 0x03ff;
702    
703     if (ecb_expect_false (e == 31))
704     /* infinity or NaN */
705     e = 255 - (127 - 15);
706     else if (ecb_expect_false (!e))
707     {
708     if (ecb_expect_true (!m))
709     /* zero, handled by code below by forcing e to 0 */
710     e = 0 - (127 - 15);
711     else
712     {
713     /* subnormal, renormalise */
714     unsigned int s = 10 - ecb_ld32 (m);
715    
716     m = (m << s) & 0x3ff; /* mask implicit bit */
717     e -= s - 1;
718     }
719     }
720    
721     /* e and m now are normalised, or zero, (or inf or nan) */
722     e += 127 - 15;
723    
724     return s | (e << 23) | (m << (23 - 10));
725     }
726    
727     ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
728     ecb_function_ ecb_const uint16_t
729     ecb_binary32_to_binary16 (uint32_t x)
730     {
731     unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
732     unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
733     unsigned int m = x & 0x007fffff;
734    
735     x &= 0x7fffffff;
736    
737     /* if it's within range of binary16 normals, use fast path */
738     if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
739     {
740     /* mantissa round-to-even */
741     m += 0x00000fff + ((m >> (23 - 10)) & 1);
742    
743     /* handle overflow */
744     if (ecb_expect_false (m >= 0x00800000))
745     {
746     m >>= 1;
747     e += 1;
748     }
749    
750     return s | (e << 10) | (m >> (23 - 10));
751     }
752    
753     /* handle large numbers and infinity */
754     if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
755     return s | 0x7c00;
756    
757 root 1.169 /* handle zero, subnormals and small numbers */
758 root 1.167 if (ecb_expect_true (x < 0x38800000))
759     {
760     /* zero */
761     if (ecb_expect_true (!x))
762     return s;
763    
764     /* handle subnormals */
765    
766 root 1.169 /* too small, will be zero */
767     if (e < (14 - 24)) /* might not be sharp, but is good enough */
768     return s;
769    
770 root 1.167 m |= 0x00800000; /* make implicit bit explicit */
771    
772     /* very tricky - we need to round to the nearest e (+10) bit value */
773     {
774     unsigned int bits = 14 - e;
775     unsigned int half = (1 << (bits - 1)) - 1;
776     unsigned int even = (m >> bits) & 1;
777    
778     /* if this overflows, we will end up with a normalised number */
779     m = (m + half + even) >> bits;
780     }
781    
782     return s | m;
783     }
784    
785     /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
786     m >>= 13;
787    
788     return s | 0x7c00 | m | !m;
789     }
790    
791 root 1.104 /*******************************************************************************/
792     /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
793    
794     /* basically, everything uses "ieee pure-endian" floating point numbers */
795     /* the only noteworthy exception is ancient armle, which uses order 43218765 */
796     #if 0 \
797     || __i386 || __i386__ \
798 sf-exg 1.159 || ECB_GCC_AMD64 \
799 root 1.104 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
800     || defined __s390__ || defined __s390x__ \
801     || defined __mips__ \
802     || defined __alpha__ \
803     || defined __hppa__ \
804     || defined __ia64__ \
805 root 1.117 || defined __m68k__ \
806     || defined __m88k__ \
807     || defined __sh__ \
808 sf-exg 1.159 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
809 root 1.131 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
810 root 1.132 || defined __aarch64__
811 root 1.104 #define ECB_STDFP 1
812     #include <string.h> /* for memcpy */
813 root 1.102 #else
814 root 1.104 #define ECB_STDFP 0
815 root 1.102 #endif
816    
817 root 1.104 #ifndef ECB_NO_LIBM
818 root 1.103
819 root 1.121 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
820    
821 root 1.122 /* only the oldest of old doesn't have this one. solaris. */
822     #ifdef INFINITY
823     #define ECB_INFINITY INFINITY
824     #else
825     #define ECB_INFINITY HUGE_VAL
826     #endif
827    
828     #ifdef NAN
829 root 1.121 #define ECB_NAN NAN
830     #else
831 root 1.122 #define ECB_NAN ECB_INFINITY
832 root 1.121 #endif
833 root 1.120
834 root 1.148 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
835 root 1.150 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
836 sf-exg 1.163 #define ecb_frexpf(x,e) frexpf ((x), (e))
837 root 1.148 #else
838 sf-exg 1.161 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
839 sf-exg 1.163 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
840 root 1.148 #endif
841    
842 root 1.104 /* convert a float to ieee single/binary32 */
843 root 1.151 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
844     ecb_function_ ecb_const uint32_t
845 root 1.103 ecb_float_to_binary32 (float x)
846     {
847     uint32_t r;
848    
849     #if ECB_STDFP
850 root 1.104 memcpy (&r, &x, 4);
851 root 1.103 #else
852 root 1.105 /* slow emulation, works for anything but -0 */
853 root 1.103 uint32_t m;
854     int e;
855    
856 root 1.108 if (x == 0e0f ) return 0x00000000U;
857 root 1.103 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
858     if (x < -3.40282346638528860e+38f) return 0xff800000U;
859 root 1.105 if (x != x ) return 0x7fbfffffU;
860 root 1.103
861 sf-exg 1.163 m = ecb_frexpf (x, &e) * 0x1000000U;
862 root 1.103
863     r = m & 0x80000000U;
864    
865     if (r)
866     m = -m;
867    
868 root 1.108 if (e <= -126)
869 root 1.103 {
870     m &= 0xffffffU;
871     m >>= (-125 - e);
872     e = -126;
873     }
874    
875     r |= (e + 126) << 23;
876     r |= m & 0x7fffffU;
877     #endif
878    
879     return r;
880     }
881    
882 root 1.104 /* converts an ieee single/binary32 to a float */
883 root 1.151 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
884     ecb_function_ ecb_const float
885 root 1.103 ecb_binary32_to_float (uint32_t x)
886     {
887     float r;
888    
889     #if ECB_STDFP
890 root 1.104 memcpy (&r, &x, 4);
891 root 1.103 #else
892     /* emulation, only works for normals and subnormals and +0 */
893     int neg = x >> 31;
894     int e = (x >> 23) & 0xffU;
895    
896     x &= 0x7fffffU;
897    
898     if (e)
899     x |= 0x800000U;
900 root 1.104 else
901     e = 1;
902 root 1.103
903     /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
904 root 1.148 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
905 root 1.103
906     r = neg ? -r : r;
907     #endif
908    
909     return r;
910     }
911    
912 root 1.104 /* convert a double to ieee double/binary64 */
913 root 1.151 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
914     ecb_function_ ecb_const uint64_t
915 root 1.103 ecb_double_to_binary64 (double x)
916     {
917 root 1.104 uint64_t r;
918    
919     #if ECB_STDFP
920     memcpy (&r, &x, 8);
921     #else
922 root 1.105 /* slow emulation, works for anything but -0 */
923 root 1.104 uint64_t m;
924     int e;
925    
926 root 1.108 if (x == 0e0 ) return 0x0000000000000000U;
927 root 1.104 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
928     if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
929 root 1.105 if (x != x ) return 0X7ff7ffffffffffffU;
930 root 1.104
931     m = frexp (x, &e) * 0x20000000000000U;
932    
933     r = m & 0x8000000000000000;;
934    
935     if (r)
936     m = -m;
937    
938 root 1.108 if (e <= -1022)
939 root 1.104 {
940     m &= 0x1fffffffffffffU;
941     m >>= (-1021 - e);
942     e = -1022;
943     }
944    
945     r |= ((uint64_t)(e + 1022)) << 52;
946     r |= m & 0xfffffffffffffU;
947     #endif
948    
949     return r;
950     }
951    
952     /* converts an ieee double/binary64 to a double */
953 root 1.151 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
954     ecb_function_ ecb_const double
955 root 1.104 ecb_binary64_to_double (uint64_t x)
956     {
957     double r;
958    
959     #if ECB_STDFP
960     memcpy (&r, &x, 8);
961     #else
962     /* emulation, only works for normals and subnormals and +0 */
963     int neg = x >> 63;
964     int e = (x >> 52) & 0x7ffU;
965    
966     x &= 0xfffffffffffffU;
967    
968     if (e)
969     x |= 0x10000000000000U;
970     else
971     e = 1;
972    
973 root 1.107 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
974 root 1.108 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
975 root 1.104
976     r = neg ? -r : r;
977     #endif
978    
979     return r;
980 root 1.103 }
981    
982 root 1.167 /* convert a float to ieee half/binary16 */
983     ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
984     ecb_function_ ecb_const uint16_t
985     ecb_float_to_binary16 (float x)
986     {
987     return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
988     }
989    
990     /* convert an ieee half/binary16 to float */
991     ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
992     ecb_function_ ecb_const float
993     ecb_binary16_to_float (uint16_t x)
994     {
995     return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
996     }
997    
998 root 1.103 #endif
999 root 1.102
1000 root 1.1 #endif
1001