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Revision: 1.175
Committed: Wed Dec 2 08:30:07 2015 UTC (8 years, 6 months ago) by root
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Branch: MAIN
Changes since 1.174: +10 -2 lines
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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 1.173 #if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
73 root 1.87 #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 1.175 #elif defined __ARM_ARCH_2__ \
177     || defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \
178     || defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \
179     || defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \
180     || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
181     || defined __ARM_ARCH_5TEJ__
182     /* should not need any, unless running old code on newer cpu - arm doesn't support that */
183 root 1.85 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
184 root 1.175 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
185     || defined __ARM_ARCH_6T2__
186 root 1.84 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
187 root 1.85 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
188 root 1.175 || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
189 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
190 root 1.129 #elif __aarch64__
191     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
192 root 1.166 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
193 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
194     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
195     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
196 root 1.85 #elif defined __s390__ || defined __s390x__
197 root 1.77 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
198 root 1.85 #elif defined __mips__
199 root 1.118 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
200 root 1.116 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
201     #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
202 root 1.86 #elif defined __alpha__
203 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
204     #elif defined __hppa__
205     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
206     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
207     #elif defined __ia64__
208     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
209 root 1.117 #elif defined __m68k__
210     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
211     #elif defined __m88k__
212     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
213     #elif defined __sh__
214     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
215 root 1.52 #endif
216     #endif
217     #endif
218    
219     #ifndef ECB_MEMORY_FENCE
220 root 1.93 #if ECB_GCC_VERSION(4,7)
221 root 1.97 /* see comment below (stdatomic.h) about the C11 memory model. */
222 root 1.93 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
223 root 1.128 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
224     #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
225 root 1.110
226 sf-exg 1.140 #elif ECB_CLANG_EXTENSION(c_atomic)
227     /* see comment below (stdatomic.h) about the C11 memory model. */
228     #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
229     #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
230     #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
231 root 1.110
232 root 1.93 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
233 root 1.52 #define ECB_MEMORY_FENCE __sync_synchronize ()
234 root 1.126 #elif _MSC_VER >= 1500 /* VC++ 2008 */
235     /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
236     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
237     #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
238     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
239     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
240 root 1.57 #elif _MSC_VER >= 1400 /* VC++ 2005 */
241     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
242     #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
243     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
244     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
245 root 1.85 #elif defined _WIN32
246 root 1.55 #include <WinNT.h>
247 root 1.57 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
248 root 1.72 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
249     #include <mbarrier.h>
250     #define ECB_MEMORY_FENCE __machine_rw_barrier ()
251     #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
252     #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
253 root 1.82 #elif __xlC__
254 root 1.83 #define ECB_MEMORY_FENCE __sync ()
255 root 1.52 #endif
256     #endif
257    
258 root 1.53 #ifndef ECB_MEMORY_FENCE
259 root 1.94 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
260     /* we assume that these memory fences work on all variables/all memory accesses, */
261     /* not just C11 atomics and atomic accesses */
262     #include <stdatomic.h>
263 root 1.97 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
264     /* any fence other than seq_cst, which isn't very efficient for us. */
265     /* Why that is, we don't know - either the C11 memory model is quite useless */
266     /* for most usages, or gcc and clang have a bug */
267     /* I *currently* lean towards the latter, and inefficiently implement */
268     /* all three of ecb's fences as a seq_cst fence */
269 root 1.128 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
270     /* for all __atomic_thread_fence's except seq_cst */
271 root 1.94 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
272     #endif
273     #endif
274    
275     #ifndef ECB_MEMORY_FENCE
276 root 1.62 #if !ECB_AVOID_PTHREADS
277     /*
278     * if you get undefined symbol references to pthread_mutex_lock,
279     * or failure to find pthread.h, then you should implement
280     * the ECB_MEMORY_FENCE operations for your cpu/compiler
281     * OR provide pthread.h and link against the posix thread library
282     * of your system.
283     */
284     #include <pthread.h>
285     #define ECB_NEEDS_PTHREADS 1
286     #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
287 root 1.52
288 root 1.62 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
289     #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
290     #endif
291     #endif
292    
293 root 1.85 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
294 root 1.52 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
295 root 1.62 #endif
296    
297 root 1.85 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
298 root 1.52 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
299     #endif
300    
301     /*****************************************************************************/
302    
303 root 1.149 #if ECB_CPP
304 root 1.46 #define ecb_inline static inline
305 root 1.38 #elif ECB_GCC_VERSION(2,5)
306 root 1.46 #define ecb_inline static __inline__
307 root 1.39 #elif ECB_C99
308 root 1.46 #define ecb_inline static inline
309 root 1.29 #else
310 root 1.46 #define ecb_inline static
311 root 1.38 #endif
312    
313     #if ECB_GCC_VERSION(3,3)
314     #define ecb_restrict __restrict__
315 root 1.39 #elif ECB_C99
316 root 1.38 #define ecb_restrict restrict
317     #else
318     #define ecb_restrict
319 root 1.4 #endif
320    
321 root 1.38 typedef int ecb_bool;
322    
323 root 1.8 #define ECB_CONCAT_(a, b) a ## b
324     #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
325     #define ECB_STRINGIFY_(a) # a
326     #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
327 root 1.155 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
328 root 1.8
329 root 1.46 #define ecb_function_ ecb_inline
330 root 1.3
331 sf-exg 1.138 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
332 root 1.142 #define ecb_attribute(attrlist) __attribute__ (attrlist)
333 root 1.37 #else
334     #define ecb_attribute(attrlist)
335 sf-exg 1.138 #endif
336 root 1.127
337 sf-exg 1.138 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
338     #define ecb_is_constant(expr) __builtin_constant_p (expr)
339     #else
340 root 1.127 /* possible C11 impl for integral types
341     typedef struct ecb_is_constant_struct ecb_is_constant_struct;
342     #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
343    
344 root 1.37 #define ecb_is_constant(expr) 0
345 sf-exg 1.138 #endif
346    
347     #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
348     #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
349     #else
350 root 1.37 #define ecb_expect(expr,value) (expr)
351 sf-exg 1.138 #endif
352    
353     #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
354     #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
355     #else
356 root 1.37 #define ecb_prefetch(addr,rw,locality)
357 root 1.1 #endif
358    
359 root 1.2 /* no emulation for ecb_decltype */
360 root 1.143 #if ECB_CPP11
361 root 1.144 // older implementations might have problems with decltype(x)::type, work around it
362 root 1.146 template<class T> struct ecb_decltype_t { typedef T type; };
363     #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
364 root 1.143 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
365     #define ecb_decltype(x) __typeof__ (x)
366 root 1.1 #endif
367    
368 root 1.135 #if _MSC_VER >= 1300
369 root 1.149 #define ecb_deprecated __declspec (deprecated)
370 root 1.135 #else
371     #define ecb_deprecated ecb_attribute ((__deprecated__))
372     #endif
373    
374 sf-exg 1.162 #if _MSC_VER >= 1500
375 root 1.154 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
376     #elif ECB_GCC_VERSION(4,5)
377     #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
378     #else
379     #define ecb_deprecated_message(msg) ecb_deprecated
380     #endif
381    
382     #if _MSC_VER >= 1400
383     #define ecb_noinline __declspec (noinline)
384     #else
385     #define ecb_noinline ecb_attribute ((__noinline__))
386     #endif
387    
388 root 1.24 #define ecb_unused ecb_attribute ((__unused__))
389     #define ecb_const ecb_attribute ((__const__))
390     #define ecb_pure ecb_attribute ((__pure__))
391 root 1.35
392 root 1.145 #if ECB_C11 || __IBMC_NORETURN
393 sf-exg 1.165 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
394 root 1.90 #define ecb_noreturn _Noreturn
395 root 1.153 #elif ECB_CPP11
396     #define ecb_noreturn [[noreturn]]
397     #elif _MSC_VER >= 1200
398 sf-exg 1.156 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
399 root 1.153 #define ecb_noreturn __declspec (noreturn)
400 root 1.90 #else
401     #define ecb_noreturn ecb_attribute ((__noreturn__))
402     #endif
403    
404 root 1.35 #if ECB_GCC_VERSION(4,3)
405 root 1.39 #define ecb_artificial ecb_attribute ((__artificial__))
406     #define ecb_hot ecb_attribute ((__hot__))
407     #define ecb_cold ecb_attribute ((__cold__))
408 root 1.35 #else
409     #define ecb_artificial
410     #define ecb_hot
411     #define ecb_cold
412     #endif
413 root 1.1
414 root 1.39 /* put around conditional expressions if you are very sure that the */
415     /* expression is mostly true or mostly false. note that these return */
416     /* booleans, not the expression. */
417 root 1.33 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
418     #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
419 root 1.36 /* for compatibility to the rest of the world */
420 root 1.33 #define ecb_likely(expr) ecb_expect_true (expr)
421     #define ecb_unlikely(expr) ecb_expect_false (expr)
422 root 1.1
423 root 1.3 /* count trailing zero bits and count # of one bits */
424 root 1.139 #if ECB_GCC_VERSION(3,4) \
425     || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
426     && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
427     && ECB_CLANG_BUILTIN(__builtin_popcount))
428 root 1.49 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
429     #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
430     #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
431 root 1.35 #define ecb_ctz32(x) __builtin_ctz (x)
432 root 1.49 #define ecb_ctz64(x) __builtin_ctzll (x)
433 root 1.35 #define ecb_popcount32(x) __builtin_popcount (x)
434 root 1.49 /* no popcountll */
435 root 1.1 #else
436 root 1.151 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
437     ecb_function_ ecb_const int
438 root 1.35 ecb_ctz32 (uint32_t x)
439     {
440 root 1.171 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
441 root 1.172 unsigned long r;
442 root 1.171 _BitScanForward (&r, x);
443     return (int)r;
444     #else
445 root 1.35 int r = 0;
446    
447 root 1.48 x &= ~x + 1; /* this isolates the lowest bit */
448 root 1.35
449 root 1.50 #if ECB_branchless_on_i386
450     r += !!(x & 0xaaaaaaaa) << 0;
451     r += !!(x & 0xcccccccc) << 1;
452     r += !!(x & 0xf0f0f0f0) << 2;
453     r += !!(x & 0xff00ff00) << 3;
454     r += !!(x & 0xffff0000) << 4;
455     #else
456 root 1.35 if (x & 0xaaaaaaaa) r += 1;
457     if (x & 0xcccccccc) r += 2;
458     if (x & 0xf0f0f0f0) r += 4;
459     if (x & 0xff00ff00) r += 8;
460     if (x & 0xffff0000) r += 16;
461 root 1.50 #endif
462 root 1.35
463     return r;
464 root 1.171 #endif
465 root 1.35 }
466    
467 root 1.151 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
468     ecb_function_ ecb_const int
469 root 1.49 ecb_ctz64 (uint64_t x)
470     {
471 root 1.171 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
472 root 1.172 unsigned long r;
473 root 1.171 _BitScanForward64 (&r, x);
474     return (int)r;
475     #else
476 root 1.168 int shift = x & 0xffffffff ? 0 : 32;
477 root 1.50 return ecb_ctz32 (x >> shift) + shift;
478 root 1.171 #endif
479 root 1.49 }
480    
481 root 1.151 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
482     ecb_function_ ecb_const int
483 root 1.35 ecb_popcount32 (uint32_t x)
484     {
485     x -= (x >> 1) & 0x55555555;
486     x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
487     x = ((x >> 4) + x) & 0x0f0f0f0f;
488     x *= 0x01010101;
489 root 1.1
490 root 1.35 return x >> 24;
491     }
492 root 1.49
493 root 1.151 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
494     ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
495 root 1.49 {
496 root 1.171 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
497 root 1.172 unsigned long r;
498 root 1.171 _BitScanReverse (&r, x);
499     return (int)r;
500     #else
501 root 1.50 int r = 0;
502 root 1.49
503 root 1.50 if (x >> 16) { x >>= 16; r += 16; }
504     if (x >> 8) { x >>= 8; r += 8; }
505     if (x >> 4) { x >>= 4; r += 4; }
506     if (x >> 2) { x >>= 2; r += 2; }
507     if (x >> 1) { r += 1; }
508 root 1.49
509     return r;
510 root 1.171 #endif
511 root 1.49 }
512    
513 root 1.151 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
514     ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
515 root 1.49 {
516 root 1.171 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
517 root 1.172 unsigned long r;
518 root 1.171 _BitScanReverse64 (&r, x);
519     return (int)r;
520     #else
521 root 1.50 int r = 0;
522 root 1.49
523 root 1.50 if (x >> 32) { x >>= 32; r += 32; }
524 root 1.49
525 root 1.50 return r + ecb_ld32 (x);
526 root 1.171 #endif
527 root 1.49 }
528 root 1.1 #endif
529    
530 root 1.151 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
531     ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
532     ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
533     ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
534 root 1.88
535 root 1.151 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
536     ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
537 root 1.70 {
538     return ( (x * 0x0802U & 0x22110U)
539 root 1.151 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
540 root 1.70 }
541    
542 root 1.151 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
543     ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
544 root 1.70 {
545     x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
546     x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
547     x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
548     x = ( x >> 8 ) | ( x << 8);
549    
550     return x;
551     }
552    
553 root 1.151 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
554     ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
555 root 1.70 {
556     x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
557     x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
558     x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
559     x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
560     x = ( x >> 16 ) | ( x << 16);
561    
562     return x;
563     }
564    
565 root 1.49 /* popcount64 is only available on 64 bit cpus as gcc builtin */
566     /* so for this version we are lazy */
567 root 1.151 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
568     ecb_function_ ecb_const int
569 root 1.49 ecb_popcount64 (uint64_t x)
570     {
571     return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
572     }
573    
574 root 1.151 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
575     ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
576     ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
577     ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
578     ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
579     ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
580     ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
581     ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
582    
583     ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
584     ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
585     ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
586     ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
587     ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
588     ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
589     ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
590     ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
591 root 1.50
592 sf-exg 1.138 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
593 root 1.164 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
594     #define ecb_bswap16(x) __builtin_bswap16 (x)
595     #else
596 root 1.49 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
597 root 1.164 #endif
598 root 1.49 #define ecb_bswap32(x) __builtin_bswap32 (x)
599     #define ecb_bswap64(x) __builtin_bswap64 (x)
600 root 1.164 #elif _MSC_VER
601     #include <stdlib.h>
602     #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
603     #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
604     #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
605 root 1.13 #else
606 root 1.151 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
607     ecb_function_ ecb_const uint16_t
608 root 1.50 ecb_bswap16 (uint16_t x)
609 root 1.49 {
610 root 1.50 return ecb_rotl16 (x, 8);
611 root 1.49 }
612    
613 root 1.151 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
614     ecb_function_ ecb_const uint32_t
615 root 1.35 ecb_bswap32 (uint32_t x)
616     {
617 root 1.50 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
618 root 1.35 }
619    
620 root 1.151 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
621     ecb_function_ ecb_const uint64_t
622 root 1.49 ecb_bswap64 (uint64_t x)
623 root 1.35 {
624 root 1.50 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
625 root 1.35 }
626 root 1.13 #endif
627    
628 sf-exg 1.138 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
629 root 1.35 #define ecb_unreachable() __builtin_unreachable ()
630 root 1.13 #else
631 root 1.35 /* this seems to work fine, but gcc always emits a warning for it :/ */
632 root 1.151 ecb_inline ecb_noreturn void ecb_unreachable (void);
633     ecb_inline ecb_noreturn void ecb_unreachable (void) { }
634 root 1.13 #endif
635    
636 root 1.41 /* try to tell the compiler that some condition is definitely true */
637 root 1.100 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
638 root 1.41
639 root 1.174 ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
640     ecb_inline ecb_const uint32_t
641 root 1.23 ecb_byteorder_helper (void)
642 root 1.3 {
643 root 1.98 /* the union code still generates code under pressure in gcc, */
644 sf-exg 1.111 /* but less than using pointers, and always seems to */
645 root 1.98 /* successfully return a constant. */
646     /* the reason why we have this horrible preprocessor mess */
647 root 1.99 /* is to avoid it in all cases, at least on common architectures */
648 sf-exg 1.111 /* or when using a recent enough gcc version (>= 4.6) */
649 root 1.174 #if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
650     || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
651     #define ECB_LITTLE_ENDIAN 1
652     return 0x44332211;
653     #elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
654     || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
655     #define ECB_BIG_ENDIAN 1
656     return 0x11223344;
657 root 1.98 #else
658     union
659     {
660 root 1.174 uint8_t c[4];
661     uint32_t u;
662     } u = { 0x11, 0x22, 0x33, 0x44 };
663     return u.u;
664 root 1.98 #endif
665 root 1.3 }
666    
667 root 1.151 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
668 root 1.174 ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
669 root 1.151 ecb_inline ecb_const ecb_bool ecb_little_endian (void);
670 root 1.174 ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
671 root 1.3
672 root 1.39 #if ECB_GCC_VERSION(3,0) || ECB_C99
673 root 1.35 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
674 root 1.31 #else
675 root 1.35 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
676 root 1.31 #endif
677 root 1.21
678 root 1.149 #if ECB_CPP
679 sf-exg 1.68 template<typename T>
680     static inline T ecb_div_rd (T val, T div)
681     {
682     return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
683     }
684     template<typename T>
685     static inline T ecb_div_ru (T val, T div)
686     {
687     return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
688     }
689     #else
690     #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
691     #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
692     #endif
693 sf-exg 1.67
694 root 1.5 #if ecb_cplusplus_does_not_suck
695 root 1.40 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
696 root 1.35 template<typename T, int N>
697     static inline int ecb_array_length (const T (&arr)[N])
698     {
699     return N;
700     }
701 root 1.5 #else
702 root 1.35 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
703 root 1.5 #endif
704    
705 root 1.170 ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
706 root 1.167 ecb_function_ ecb_const uint32_t
707 root 1.170 ecb_binary16_to_binary32 (uint32_t x)
708 root 1.167 {
709     unsigned int s = (x & 0x8000) << (31 - 15);
710     int e = (x >> 10) & 0x001f;
711     unsigned int m = x & 0x03ff;
712    
713     if (ecb_expect_false (e == 31))
714     /* infinity or NaN */
715     e = 255 - (127 - 15);
716     else if (ecb_expect_false (!e))
717     {
718     if (ecb_expect_true (!m))
719     /* zero, handled by code below by forcing e to 0 */
720     e = 0 - (127 - 15);
721     else
722     {
723     /* subnormal, renormalise */
724     unsigned int s = 10 - ecb_ld32 (m);
725    
726     m = (m << s) & 0x3ff; /* mask implicit bit */
727     e -= s - 1;
728     }
729     }
730    
731     /* e and m now are normalised, or zero, (or inf or nan) */
732     e += 127 - 15;
733    
734     return s | (e << 23) | (m << (23 - 10));
735     }
736    
737     ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
738     ecb_function_ ecb_const uint16_t
739     ecb_binary32_to_binary16 (uint32_t x)
740     {
741     unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
742     unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
743     unsigned int m = x & 0x007fffff;
744    
745     x &= 0x7fffffff;
746    
747     /* if it's within range of binary16 normals, use fast path */
748     if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
749     {
750     /* mantissa round-to-even */
751     m += 0x00000fff + ((m >> (23 - 10)) & 1);
752    
753     /* handle overflow */
754     if (ecb_expect_false (m >= 0x00800000))
755     {
756     m >>= 1;
757     e += 1;
758     }
759    
760     return s | (e << 10) | (m >> (23 - 10));
761     }
762    
763     /* handle large numbers and infinity */
764     if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
765     return s | 0x7c00;
766    
767 root 1.169 /* handle zero, subnormals and small numbers */
768 root 1.167 if (ecb_expect_true (x < 0x38800000))
769     {
770     /* zero */
771     if (ecb_expect_true (!x))
772     return s;
773    
774     /* handle subnormals */
775    
776 root 1.169 /* too small, will be zero */
777     if (e < (14 - 24)) /* might not be sharp, but is good enough */
778     return s;
779    
780 root 1.167 m |= 0x00800000; /* make implicit bit explicit */
781    
782     /* very tricky - we need to round to the nearest e (+10) bit value */
783     {
784     unsigned int bits = 14 - e;
785     unsigned int half = (1 << (bits - 1)) - 1;
786     unsigned int even = (m >> bits) & 1;
787    
788     /* if this overflows, we will end up with a normalised number */
789     m = (m + half + even) >> bits;
790     }
791    
792     return s | m;
793     }
794    
795     /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
796     m >>= 13;
797    
798     return s | 0x7c00 | m | !m;
799     }
800    
801 root 1.104 /*******************************************************************************/
802     /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
803    
804     /* basically, everything uses "ieee pure-endian" floating point numbers */
805     /* the only noteworthy exception is ancient armle, which uses order 43218765 */
806     #if 0 \
807     || __i386 || __i386__ \
808 sf-exg 1.159 || ECB_GCC_AMD64 \
809 root 1.104 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
810     || defined __s390__ || defined __s390x__ \
811     || defined __mips__ \
812     || defined __alpha__ \
813     || defined __hppa__ \
814     || defined __ia64__ \
815 root 1.117 || defined __m68k__ \
816     || defined __m88k__ \
817     || defined __sh__ \
818 sf-exg 1.159 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
819 root 1.131 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
820 root 1.132 || defined __aarch64__
821 root 1.104 #define ECB_STDFP 1
822     #include <string.h> /* for memcpy */
823 root 1.102 #else
824 root 1.104 #define ECB_STDFP 0
825 root 1.102 #endif
826    
827 root 1.104 #ifndef ECB_NO_LIBM
828 root 1.103
829 root 1.121 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
830    
831 root 1.122 /* only the oldest of old doesn't have this one. solaris. */
832     #ifdef INFINITY
833     #define ECB_INFINITY INFINITY
834     #else
835     #define ECB_INFINITY HUGE_VAL
836     #endif
837    
838     #ifdef NAN
839 root 1.121 #define ECB_NAN NAN
840     #else
841 root 1.122 #define ECB_NAN ECB_INFINITY
842 root 1.121 #endif
843 root 1.120
844 root 1.148 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
845 root 1.150 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
846 sf-exg 1.163 #define ecb_frexpf(x,e) frexpf ((x), (e))
847 root 1.148 #else
848 sf-exg 1.161 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
849 sf-exg 1.163 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
850 root 1.148 #endif
851    
852 root 1.104 /* convert a float to ieee single/binary32 */
853 root 1.151 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
854     ecb_function_ ecb_const uint32_t
855 root 1.103 ecb_float_to_binary32 (float x)
856     {
857     uint32_t r;
858    
859     #if ECB_STDFP
860 root 1.104 memcpy (&r, &x, 4);
861 root 1.103 #else
862 root 1.105 /* slow emulation, works for anything but -0 */
863 root 1.103 uint32_t m;
864     int e;
865    
866 root 1.108 if (x == 0e0f ) return 0x00000000U;
867 root 1.103 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
868     if (x < -3.40282346638528860e+38f) return 0xff800000U;
869 root 1.105 if (x != x ) return 0x7fbfffffU;
870 root 1.103
871 sf-exg 1.163 m = ecb_frexpf (x, &e) * 0x1000000U;
872 root 1.103
873     r = m & 0x80000000U;
874    
875     if (r)
876     m = -m;
877    
878 root 1.108 if (e <= -126)
879 root 1.103 {
880     m &= 0xffffffU;
881     m >>= (-125 - e);
882     e = -126;
883     }
884    
885     r |= (e + 126) << 23;
886     r |= m & 0x7fffffU;
887     #endif
888    
889     return r;
890     }
891    
892 root 1.104 /* converts an ieee single/binary32 to a float */
893 root 1.151 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
894     ecb_function_ ecb_const float
895 root 1.103 ecb_binary32_to_float (uint32_t x)
896     {
897     float r;
898    
899     #if ECB_STDFP
900 root 1.104 memcpy (&r, &x, 4);
901 root 1.103 #else
902     /* emulation, only works for normals and subnormals and +0 */
903     int neg = x >> 31;
904     int e = (x >> 23) & 0xffU;
905    
906     x &= 0x7fffffU;
907    
908     if (e)
909     x |= 0x800000U;
910 root 1.104 else
911     e = 1;
912 root 1.103
913     /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
914 root 1.148 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
915 root 1.103
916     r = neg ? -r : r;
917     #endif
918    
919     return r;
920     }
921    
922 root 1.104 /* convert a double to ieee double/binary64 */
923 root 1.151 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
924     ecb_function_ ecb_const uint64_t
925 root 1.103 ecb_double_to_binary64 (double x)
926     {
927 root 1.104 uint64_t r;
928    
929     #if ECB_STDFP
930     memcpy (&r, &x, 8);
931     #else
932 root 1.105 /* slow emulation, works for anything but -0 */
933 root 1.104 uint64_t m;
934     int e;
935    
936 root 1.108 if (x == 0e0 ) return 0x0000000000000000U;
937 root 1.104 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
938     if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
939 root 1.105 if (x != x ) return 0X7ff7ffffffffffffU;
940 root 1.104
941     m = frexp (x, &e) * 0x20000000000000U;
942    
943     r = m & 0x8000000000000000;;
944    
945     if (r)
946     m = -m;
947    
948 root 1.108 if (e <= -1022)
949 root 1.104 {
950     m &= 0x1fffffffffffffU;
951     m >>= (-1021 - e);
952     e = -1022;
953     }
954    
955     r |= ((uint64_t)(e + 1022)) << 52;
956     r |= m & 0xfffffffffffffU;
957     #endif
958    
959     return r;
960     }
961    
962     /* converts an ieee double/binary64 to a double */
963 root 1.151 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
964     ecb_function_ ecb_const double
965 root 1.104 ecb_binary64_to_double (uint64_t x)
966     {
967     double r;
968    
969     #if ECB_STDFP
970     memcpy (&r, &x, 8);
971     #else
972     /* emulation, only works for normals and subnormals and +0 */
973     int neg = x >> 63;
974     int e = (x >> 52) & 0x7ffU;
975    
976     x &= 0xfffffffffffffU;
977    
978     if (e)
979     x |= 0x10000000000000U;
980     else
981     e = 1;
982    
983 root 1.107 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
984 root 1.108 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
985 root 1.104
986     r = neg ? -r : r;
987     #endif
988    
989     return r;
990 root 1.103 }
991    
992 root 1.167 /* convert a float to ieee half/binary16 */
993     ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
994     ecb_function_ ecb_const uint16_t
995     ecb_float_to_binary16 (float x)
996     {
997     return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
998     }
999    
1000     /* convert an ieee half/binary16 to float */
1001     ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
1002     ecb_function_ ecb_const float
1003     ecb_binary16_to_float (uint16_t x)
1004     {
1005     return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
1006     }
1007    
1008 root 1.103 #endif
1009 root 1.102
1010 root 1.1 #endif
1011