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Revision: 1.4
Committed: Thu Nov 12 03:04:54 2020 UTC (3 years, 8 months ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: HEAD
Changes since 1.3: +131 -4 lines
Log Message:
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# User Rev Content
1 root 1.1 /*
2     * libecb - http://software.schmorp.de/pkg/libecb
3     *
4 root 1.4 * Copyright (©) 2009-2015,2018-2020 Marc Alexander Lehmann <libecb@schmorp.de>
5 root 1.1 * 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 root 1.4 #define ECB_VERSION 0x00010008
46 root 1.1
47 root 1.4 #include <string.h> /* for memcpy */
48    
49     #if defined (_WIN32) && !defined (__MINGW32__)
50 root 1.1 typedef signed char int8_t;
51     typedef unsigned char uint8_t;
52 root 1.4 typedef signed char int_fast8_t;
53     typedef unsigned char uint_fast8_t;
54 root 1.1 typedef signed short int16_t;
55     typedef unsigned short uint16_t;
56 root 1.4 typedef signed int int_fast16_t;
57     typedef unsigned int uint_fast16_t;
58 root 1.1 typedef signed int int32_t;
59     typedef unsigned int uint32_t;
60 root 1.4 typedef signed int int_fast32_t;
61     typedef unsigned int uint_fast32_t;
62 root 1.1 #if __GNUC__
63     typedef signed long long int64_t;
64     typedef unsigned long long uint64_t;
65     #else /* _MSC_VER || __BORLANDC__ */
66     typedef signed __int64 int64_t;
67     typedef unsigned __int64 uint64_t;
68     #endif
69 root 1.4 typedef int64_t int_fast64_t;
70     typedef uint64_t uint_fast64_t;
71 root 1.1 #ifdef _WIN64
72     #define ECB_PTRSIZE 8
73     typedef uint64_t uintptr_t;
74     typedef int64_t intptr_t;
75     #else
76     #define ECB_PTRSIZE 4
77     typedef uint32_t uintptr_t;
78     typedef int32_t intptr_t;
79     #endif
80     #else
81     #include <inttypes.h>
82     #if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
83     #define ECB_PTRSIZE 8
84     #else
85     #define ECB_PTRSIZE 4
86     #endif
87     #endif
88    
89     #define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
90     #define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)
91    
92 root 1.3 #ifndef ECB_OPTIMIZE_SIZE
93     #if __OPTIMIZE_SIZE__
94     #define ECB_OPTIMIZE_SIZE 1
95     #else
96     #define ECB_OPTIMIZE_SIZE 0
97     #endif
98     #endif
99    
100 root 1.1 /* work around x32 idiocy by defining proper macros */
101     #if ECB_GCC_AMD64 || ECB_MSVC_AMD64
102     #if _ILP32
103     #define ECB_AMD64_X32 1
104     #else
105     #define ECB_AMD64 1
106     #endif
107     #endif
108    
109     /* many compilers define _GNUC_ to some versions but then only implement
110     * what their idiot authors think are the "more important" extensions,
111     * causing enormous grief in return for some better fake benchmark numbers.
112     * or so.
113     * we try to detect these and simply assume they are not gcc - if they have
114     * an issue with that they should have done it right in the first place.
115     */
116     #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
117     #define ECB_GCC_VERSION(major,minor) 0
118     #else
119     #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
120     #endif
121    
122     #define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
123    
124     #if __clang__ && defined __has_builtin
125     #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
126     #else
127     #define ECB_CLANG_BUILTIN(x) 0
128     #endif
129    
130     #if __clang__ && defined __has_extension
131     #define ECB_CLANG_EXTENSION(x) __has_extension (x)
132     #else
133     #define ECB_CLANG_EXTENSION(x) 0
134     #endif
135    
136     #define ECB_CPP (__cplusplus+0)
137     #define ECB_CPP11 (__cplusplus >= 201103L)
138 root 1.2 #define ECB_CPP14 (__cplusplus >= 201402L)
139     #define ECB_CPP17 (__cplusplus >= 201703L)
140 root 1.1
141     #if ECB_CPP
142     #define ECB_C 0
143     #define ECB_STDC_VERSION 0
144     #else
145     #define ECB_C 1
146     #define ECB_STDC_VERSION __STDC_VERSION__
147     #endif
148    
149     #define ECB_C99 (ECB_STDC_VERSION >= 199901L)
150     #define ECB_C11 (ECB_STDC_VERSION >= 201112L)
151 root 1.2 #define ECB_C17 (ECB_STDC_VERSION >= 201710L)
152 root 1.1
153     #if ECB_CPP
154     #define ECB_EXTERN_C extern "C"
155     #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
156     #define ECB_EXTERN_C_END }
157     #else
158     #define ECB_EXTERN_C extern
159     #define ECB_EXTERN_C_BEG
160     #define ECB_EXTERN_C_END
161     #endif
162    
163     /*****************************************************************************/
164    
165     /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
166     /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
167    
168     #if ECB_NO_THREADS
169     #define ECB_NO_SMP 1
170     #endif
171    
172     #if ECB_NO_SMP
173     #define ECB_MEMORY_FENCE do { } while (0)
174     #endif
175    
176     /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
177     #if __xlC__ && ECB_CPP
178     #include <builtins.h>
179     #endif
180    
181     #if 1400 <= _MSC_VER
182     #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
183     #endif
184    
185     #ifndef ECB_MEMORY_FENCE
186     #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
187 root 1.3 #define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory")
188 root 1.1 #if __i386 || __i386__
189     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
190     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
191     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
192     #elif ECB_GCC_AMD64
193     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
194     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
195     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("" : : : "memory")
196     #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
197     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
198     #elif defined __ARM_ARCH_2__ \
199     || defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \
200     || defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \
201     || defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \
202     || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
203     || defined __ARM_ARCH_5TEJ__
204     /* should not need any, unless running old code on newer cpu - arm doesn't support that */
205     #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
206     || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
207     || defined __ARM_ARCH_6T2__
208     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
209     #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
210     || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
211     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
212     #elif __aarch64__
213     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
214     #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
215     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
216     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
217     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
218     #elif defined __s390__ || defined __s390x__
219     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
220     #elif defined __mips__
221     /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
222     /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
223     #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
224     #elif defined __alpha__
225     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
226     #elif defined __hppa__
227     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
228     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
229     #elif defined __ia64__
230     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
231     #elif defined __m68k__
232     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
233     #elif defined __m88k__
234     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
235     #elif defined __sh__
236     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
237     #endif
238     #endif
239     #endif
240    
241     #ifndef ECB_MEMORY_FENCE
242     #if ECB_GCC_VERSION(4,7)
243     /* see comment below (stdatomic.h) about the C11 memory model. */
244     #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
245     #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
246     #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
247 root 1.3 #define ECB_MEMORY_FENCE_RELAXED __atomic_thread_fence (__ATOMIC_RELAXED)
248 root 1.1
249     #elif ECB_CLANG_EXTENSION(c_atomic)
250     /* see comment below (stdatomic.h) about the C11 memory model. */
251     #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
252     #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
253     #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
254 root 1.3 #define ECB_MEMORY_FENCE_RELAXED __c11_atomic_thread_fence (__ATOMIC_RELAXED)
255 root 1.1
256     #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
257     #define ECB_MEMORY_FENCE __sync_synchronize ()
258     #elif _MSC_VER >= 1500 /* VC++ 2008 */
259     /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
260     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
261     #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
262     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
263     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
264     #elif _MSC_VER >= 1400 /* VC++ 2005 */
265     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
266     #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
267     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
268     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
269     #elif defined _WIN32
270     #include <WinNT.h>
271     #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
272     #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
273     #include <mbarrier.h>
274 root 1.3 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
275     #define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier ()
276     #define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier ()
277     #define ECB_MEMORY_FENCE_RELAXED __compiler_barrier ()
278 root 1.1 #elif __xlC__
279     #define ECB_MEMORY_FENCE __sync ()
280     #endif
281     #endif
282    
283     #ifndef ECB_MEMORY_FENCE
284     #if ECB_C11 && !defined __STDC_NO_ATOMICS__
285     /* we assume that these memory fences work on all variables/all memory accesses, */
286     /* not just C11 atomics and atomic accesses */
287     #include <stdatomic.h>
288     #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
289 root 1.3 #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
290     #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
291 root 1.1 #endif
292     #endif
293    
294     #ifndef ECB_MEMORY_FENCE
295     #if !ECB_AVOID_PTHREADS
296     /*
297     * if you get undefined symbol references to pthread_mutex_lock,
298     * or failure to find pthread.h, then you should implement
299     * the ECB_MEMORY_FENCE operations for your cpu/compiler
300     * OR provide pthread.h and link against the posix thread library
301     * of your system.
302     */
303     #include <pthread.h>
304     #define ECB_NEEDS_PTHREADS 1
305     #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
306    
307     static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
308     #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
309     #endif
310     #endif
311    
312     #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
313     #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
314     #endif
315    
316     #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
317     #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
318     #endif
319    
320 root 1.3 #if !defined ECB_MEMORY_FENCE_RELAXED && defined ECB_MEMORY_FENCE
321     #define ECB_MEMORY_FENCE_RELAXED ECB_MEMORY_FENCE /* very heavy-handed */
322     #endif
323    
324 root 1.1 /*****************************************************************************/
325    
326     #if ECB_CPP
327     #define ecb_inline static inline
328     #elif ECB_GCC_VERSION(2,5)
329     #define ecb_inline static __inline__
330     #elif ECB_C99
331     #define ecb_inline static inline
332     #else
333     #define ecb_inline static
334     #endif
335    
336     #if ECB_GCC_VERSION(3,3)
337     #define ecb_restrict __restrict__
338     #elif ECB_C99
339     #define ecb_restrict restrict
340     #else
341     #define ecb_restrict
342     #endif
343    
344     typedef int ecb_bool;
345    
346     #define ECB_CONCAT_(a, b) a ## b
347     #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
348     #define ECB_STRINGIFY_(a) # a
349     #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
350     #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
351    
352     #define ecb_function_ ecb_inline
353    
354     #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
355     #define ecb_attribute(attrlist) __attribute__ (attrlist)
356     #else
357     #define ecb_attribute(attrlist)
358     #endif
359    
360     #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
361     #define ecb_is_constant(expr) __builtin_constant_p (expr)
362     #else
363     /* possible C11 impl for integral types
364     typedef struct ecb_is_constant_struct ecb_is_constant_struct;
365     #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
366    
367     #define ecb_is_constant(expr) 0
368     #endif
369    
370     #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
371     #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
372     #else
373     #define ecb_expect(expr,value) (expr)
374     #endif
375    
376     #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
377     #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
378     #else
379     #define ecb_prefetch(addr,rw,locality)
380     #endif
381    
382     /* no emulation for ecb_decltype */
383     #if ECB_CPP11
384     // older implementations might have problems with decltype(x)::type, work around it
385     template<class T> struct ecb_decltype_t { typedef T type; };
386     #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
387     #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
388     #define ecb_decltype(x) __typeof__ (x)
389     #endif
390    
391     #if _MSC_VER >= 1300
392     #define ecb_deprecated __declspec (deprecated)
393     #else
394     #define ecb_deprecated ecb_attribute ((__deprecated__))
395     #endif
396    
397     #if _MSC_VER >= 1500
398     #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
399     #elif ECB_GCC_VERSION(4,5)
400     #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
401     #else
402     #define ecb_deprecated_message(msg) ecb_deprecated
403     #endif
404    
405     #if _MSC_VER >= 1400
406     #define ecb_noinline __declspec (noinline)
407     #else
408     #define ecb_noinline ecb_attribute ((__noinline__))
409     #endif
410    
411     #define ecb_unused ecb_attribute ((__unused__))
412     #define ecb_const ecb_attribute ((__const__))
413     #define ecb_pure ecb_attribute ((__pure__))
414    
415     #if ECB_C11 || __IBMC_NORETURN
416     /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
417     #define ecb_noreturn _Noreturn
418     #elif ECB_CPP11
419     #define ecb_noreturn [[noreturn]]
420     #elif _MSC_VER >= 1200
421     /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
422     #define ecb_noreturn __declspec (noreturn)
423     #else
424     #define ecb_noreturn ecb_attribute ((__noreturn__))
425     #endif
426    
427     #if ECB_GCC_VERSION(4,3)
428     #define ecb_artificial ecb_attribute ((__artificial__))
429     #define ecb_hot ecb_attribute ((__hot__))
430     #define ecb_cold ecb_attribute ((__cold__))
431     #else
432     #define ecb_artificial
433     #define ecb_hot
434     #define ecb_cold
435     #endif
436    
437     /* put around conditional expressions if you are very sure that the */
438     /* expression is mostly true or mostly false. note that these return */
439     /* booleans, not the expression. */
440     #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
441     #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
442     /* for compatibility to the rest of the world */
443     #define ecb_likely(expr) ecb_expect_true (expr)
444     #define ecb_unlikely(expr) ecb_expect_false (expr)
445    
446     /* count trailing zero bits and count # of one bits */
447     #if ECB_GCC_VERSION(3,4) \
448     || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
449     && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
450     && ECB_CLANG_BUILTIN(__builtin_popcount))
451     /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
452     #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
453     #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
454     #define ecb_ctz32(x) __builtin_ctz (x)
455     #define ecb_ctz64(x) __builtin_ctzll (x)
456     #define ecb_popcount32(x) __builtin_popcount (x)
457     /* no popcountll */
458     #else
459     ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
460     ecb_function_ ecb_const int
461     ecb_ctz32 (uint32_t x)
462     {
463     #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
464     unsigned long r;
465     _BitScanForward (&r, x);
466     return (int)r;
467     #else
468     int r = 0;
469    
470     x &= ~x + 1; /* this isolates the lowest bit */
471    
472     #if ECB_branchless_on_i386
473     r += !!(x & 0xaaaaaaaa) << 0;
474     r += !!(x & 0xcccccccc) << 1;
475     r += !!(x & 0xf0f0f0f0) << 2;
476     r += !!(x & 0xff00ff00) << 3;
477     r += !!(x & 0xffff0000) << 4;
478     #else
479     if (x & 0xaaaaaaaa) r += 1;
480     if (x & 0xcccccccc) r += 2;
481     if (x & 0xf0f0f0f0) r += 4;
482     if (x & 0xff00ff00) r += 8;
483     if (x & 0xffff0000) r += 16;
484     #endif
485    
486     return r;
487     #endif
488     }
489    
490     ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
491     ecb_function_ ecb_const int
492     ecb_ctz64 (uint64_t x)
493     {
494     #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
495     unsigned long r;
496     _BitScanForward64 (&r, x);
497     return (int)r;
498     #else
499     int shift = x & 0xffffffff ? 0 : 32;
500     return ecb_ctz32 (x >> shift) + shift;
501     #endif
502     }
503    
504     ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
505     ecb_function_ ecb_const int
506     ecb_popcount32 (uint32_t x)
507     {
508     x -= (x >> 1) & 0x55555555;
509     x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
510     x = ((x >> 4) + x) & 0x0f0f0f0f;
511     x *= 0x01010101;
512    
513     return x >> 24;
514     }
515    
516     ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
517     ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
518     {
519     #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
520     unsigned long r;
521     _BitScanReverse (&r, x);
522     return (int)r;
523     #else
524     int r = 0;
525    
526     if (x >> 16) { x >>= 16; r += 16; }
527     if (x >> 8) { x >>= 8; r += 8; }
528     if (x >> 4) { x >>= 4; r += 4; }
529     if (x >> 2) { x >>= 2; r += 2; }
530     if (x >> 1) { r += 1; }
531    
532     return r;
533     #endif
534     }
535    
536     ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
537     ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
538     {
539     #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
540     unsigned long r;
541     _BitScanReverse64 (&r, x);
542     return (int)r;
543     #else
544     int r = 0;
545    
546     if (x >> 32) { x >>= 32; r += 32; }
547    
548     return r + ecb_ld32 (x);
549     #endif
550     }
551     #endif
552    
553     ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
554     ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
555     ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
556     ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
557    
558     ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
559     ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
560     {
561     return ( (x * 0x0802U & 0x22110U)
562     | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
563     }
564    
565     ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
566     ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
567     {
568     x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
569     x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
570     x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
571     x = ( x >> 8 ) | ( x << 8);
572    
573     return x;
574     }
575    
576     ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
577     ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
578     {
579     x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
580     x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
581     x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
582     x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
583     x = ( x >> 16 ) | ( x << 16);
584    
585     return x;
586     }
587    
588     /* popcount64 is only available on 64 bit cpus as gcc builtin */
589     /* so for this version we are lazy */
590     ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
591     ecb_function_ ecb_const int
592     ecb_popcount64 (uint64_t x)
593     {
594     return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
595     }
596    
597     ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
598     ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
599     ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
600     ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
601     ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
602     ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
603     ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
604     ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
605    
606     ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
607     ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
608     ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
609     ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
610     ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
611     ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
612     ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
613     ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
614    
615 root 1.4 #if ECB_CPP
616    
617     inline uint8_t ecb_ctz (uint8_t v) { return ecb_ctz32 (v); }
618     inline uint16_t ecb_ctz (uint16_t v) { return ecb_ctz32 (v); }
619     inline uint32_t ecb_ctz (uint32_t v) { return ecb_ctz32 (v); }
620     inline uint64_t ecb_ctz (uint64_t v) { return ecb_ctz64 (v); }
621    
622     inline bool ecb_is_pot (uint8_t v) { return ecb_is_pot32 (v); }
623     inline bool ecb_is_pot (uint16_t v) { return ecb_is_pot32 (v); }
624     inline bool ecb_is_pot (uint32_t v) { return ecb_is_pot32 (v); }
625     inline bool ecb_is_pot (uint64_t v) { return ecb_is_pot64 (v); }
626    
627     inline int ecb_ld (uint8_t v) { return ecb_ld32 (v); }
628     inline int ecb_ld (uint16_t v) { return ecb_ld32 (v); }
629     inline int ecb_ld (uint32_t v) { return ecb_ld32 (v); }
630     inline int ecb_ld (uint64_t v) { return ecb_ld64 (v); }
631    
632     inline int ecb_popcount (uint8_t v) { return ecb_popcount32 (v); }
633     inline int ecb_popcount (uint16_t v) { return ecb_popcount32 (v); }
634     inline int ecb_popcount (uint32_t v) { return ecb_popcount32 (v); }
635     inline int ecb_popcount (uint64_t v) { return ecb_popcount64 (v); }
636    
637     inline uint8_t ecb_bitrev (uint8_t v) { return ecb_bitrev8 (v); }
638     inline uint16_t ecb_bitrev (uint16_t v) { return ecb_bitrev16 (v); }
639     inline uint32_t ecb_bitrev (uint32_t v) { return ecb_bitrev32 (v); }
640    
641     inline uint8_t ecb_rotl (uint8_t v, unsigned int count) { return ecb_rotl8 (v, count); }
642     inline uint16_t ecb_rotl (uint16_t v, unsigned int count) { return ecb_rotl16 (v, count); }
643     inline uint32_t ecb_rotl (uint32_t v, unsigned int count) { return ecb_rotl32 (v, count); }
644     inline uint64_t ecb_rotl (uint64_t v, unsigned int count) { return ecb_rotl64 (v, count); }
645    
646     inline uint8_t ecb_rotr (uint8_t v, unsigned int count) { return ecb_rotr8 (v, count); }
647     inline uint16_t ecb_rotr (uint16_t v, unsigned int count) { return ecb_rotr16 (v, count); }
648     inline uint32_t ecb_rotr (uint32_t v, unsigned int count) { return ecb_rotr32 (v, count); }
649     inline uint64_t ecb_rotr (uint64_t v, unsigned int count) { return ecb_rotr64 (v, count); }
650    
651     #endif
652    
653 root 1.1 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
654     #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
655     #define ecb_bswap16(x) __builtin_bswap16 (x)
656     #else
657     #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
658     #endif
659     #define ecb_bswap32(x) __builtin_bswap32 (x)
660     #define ecb_bswap64(x) __builtin_bswap64 (x)
661     #elif _MSC_VER
662     #include <stdlib.h>
663     #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
664     #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
665     #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
666     #else
667     ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
668     ecb_function_ ecb_const uint16_t
669     ecb_bswap16 (uint16_t x)
670     {
671     return ecb_rotl16 (x, 8);
672     }
673    
674     ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
675     ecb_function_ ecb_const uint32_t
676     ecb_bswap32 (uint32_t x)
677     {
678     return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
679     }
680    
681     ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
682     ecb_function_ ecb_const uint64_t
683     ecb_bswap64 (uint64_t x)
684     {
685     return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
686     }
687     #endif
688    
689     #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
690     #define ecb_unreachable() __builtin_unreachable ()
691     #else
692     /* this seems to work fine, but gcc always emits a warning for it :/ */
693     ecb_inline ecb_noreturn void ecb_unreachable (void);
694     ecb_inline ecb_noreturn void ecb_unreachable (void) { }
695     #endif
696    
697     /* try to tell the compiler that some condition is definitely true */
698     #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
699    
700     ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
701     ecb_inline ecb_const uint32_t
702     ecb_byteorder_helper (void)
703     {
704     /* the union code still generates code under pressure in gcc, */
705     /* but less than using pointers, and always seems to */
706     /* successfully return a constant. */
707     /* the reason why we have this horrible preprocessor mess */
708     /* is to avoid it in all cases, at least on common architectures */
709     /* or when using a recent enough gcc version (>= 4.6) */
710     #if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
711     || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
712     #define ECB_LITTLE_ENDIAN 1
713     return 0x44332211;
714     #elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
715     || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
716     #define ECB_BIG_ENDIAN 1
717     return 0x11223344;
718     #else
719     union
720     {
721     uint8_t c[4];
722     uint32_t u;
723     } u = { 0x11, 0x22, 0x33, 0x44 };
724     return u.u;
725     #endif
726     }
727    
728     ecb_inline ecb_const ecb_bool ecb_big_endian (void);
729     ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
730     ecb_inline ecb_const ecb_bool ecb_little_endian (void);
731     ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
732    
733 root 1.4 /*****************************************************************************/
734     /* unaligned load/store */
735    
736     ecb_inline uint_fast16_t ecb_be_u16_to_host (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
737     ecb_inline uint_fast32_t ecb_be_u32_to_host (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
738     ecb_inline uint_fast64_t ecb_be_u64_to_host (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
739    
740     ecb_inline uint_fast16_t ecb_le_u16_to_host (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
741     ecb_inline uint_fast32_t ecb_le_u32_to_host (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
742     ecb_inline uint_fast64_t ecb_le_u64_to_host (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
743    
744     ecb_inline uint_fast16_t ecb_peek_u16_u (const void *ptr) { uint16_t v; memcpy (&v, ptr, sizeof (v)); return v; }
745     ecb_inline uint_fast32_t ecb_peek_u32_u (const void *ptr) { uint32_t v; memcpy (&v, ptr, sizeof (v)); return v; }
746     ecb_inline uint_fast64_t ecb_peek_u64_u (const void *ptr) { uint64_t v; memcpy (&v, ptr, sizeof (v)); return v; }
747    
748     ecb_inline uint_fast16_t ecb_peek_be_u16_u (const void *ptr) { return ecb_be_u16_to_host (ecb_peek_u16_u (ptr)); }
749     ecb_inline uint_fast32_t ecb_peek_be_u32_u (const void *ptr) { return ecb_be_u32_to_host (ecb_peek_u32_u (ptr)); }
750     ecb_inline uint_fast64_t ecb_peek_be_u64_u (const void *ptr) { return ecb_be_u64_to_host (ecb_peek_u64_u (ptr)); }
751    
752     ecb_inline uint_fast16_t ecb_peek_le_u16_u (const void *ptr) { return ecb_le_u16_to_host (ecb_peek_u16_u (ptr)); }
753     ecb_inline uint_fast32_t ecb_peek_le_u32_u (const void *ptr) { return ecb_le_u32_to_host (ecb_peek_u32_u (ptr)); }
754     ecb_inline uint_fast64_t ecb_peek_le_u64_u (const void *ptr) { return ecb_le_u64_to_host (ecb_peek_u64_u (ptr)); }
755    
756     ecb_inline uint_fast16_t ecb_host_to_be_u16 (uint_fast16_t v) { return ecb_little_endian () ? ecb_bswap16 (v) : v; }
757     ecb_inline uint_fast32_t ecb_host_to_be_u32 (uint_fast32_t v) { return ecb_little_endian () ? ecb_bswap32 (v) : v; }
758     ecb_inline uint_fast64_t ecb_host_to_be_u64 (uint_fast64_t v) { return ecb_little_endian () ? ecb_bswap64 (v) : v; }
759    
760     ecb_inline uint_fast16_t ecb_host_to_le_u16 (uint_fast16_t v) { return ecb_big_endian () ? ecb_bswap16 (v) : v; }
761     ecb_inline uint_fast32_t ecb_host_to_le_u32 (uint_fast32_t v) { return ecb_big_endian () ? ecb_bswap32 (v) : v; }
762     ecb_inline uint_fast64_t ecb_host_to_le_u64 (uint_fast64_t v) { return ecb_big_endian () ? ecb_bswap64 (v) : v; }
763    
764     ecb_inline void ecb_poke_u16_u (void *ptr, uint16_t v) { memcpy (ptr, &v, sizeof (v)); }
765     ecb_inline void ecb_poke_u32_u (void *ptr, uint32_t v) { memcpy (ptr, &v, sizeof (v)); }
766     ecb_inline void ecb_poke_u64_u (void *ptr, uint64_t v) { memcpy (ptr, &v, sizeof (v)); }
767    
768     ecb_inline void ecb_poke_be_u16_u (void *ptr, uint_fast16_t v) { ecb_poke_u16_u (ptr, ecb_host_to_be_u16 (v)); }
769     ecb_inline void ecb_poke_be_u32_u (void *ptr, uint_fast32_t v) { ecb_poke_u32_u (ptr, ecb_host_to_be_u32 (v)); }
770     ecb_inline void ecb_poke_be_u64_u (void *ptr, uint_fast64_t v) { ecb_poke_u64_u (ptr, ecb_host_to_be_u64 (v)); }
771    
772     ecb_inline void ecb_poke_le_u16_u (void *ptr, uint_fast16_t v) { ecb_poke_u16_u (ptr, ecb_host_to_le_u16 (v)); }
773     ecb_inline void ecb_poke_le_u32_u (void *ptr, uint_fast32_t v) { ecb_poke_u32_u (ptr, ecb_host_to_le_u32 (v)); }
774     ecb_inline void ecb_poke_le_u64_u (void *ptr, uint_fast64_t v) { ecb_poke_u64_u (ptr, ecb_host_to_le_u64 (v)); }
775    
776     #if ECB_CPP
777    
778     inline uint8_t ecb_bswap (uint8_t v) { return v; }
779     inline uint16_t ecb_bswap (uint16_t v) { return ecb_bswap16 (v); }
780     inline uint32_t ecb_bswap (uint32_t v) { return ecb_bswap32 (v); }
781     inline uint64_t ecb_bswap (uint64_t v) { return ecb_bswap64 (v); }
782    
783     template<typename T> inline T ecb_be_to_host (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
784     template<typename T> inline T ecb_le_to_host (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
785     template<typename T> inline T ecb_peek (const void *ptr) { return *(const T *)ptr; }
786     template<typename T> inline T ecb_peek_be (const void *ptr) { return ecb_be_to_host (ecb_peek <T> (ptr)); }
787     template<typename T> inline T ecb_peek_le (const void *ptr) { return ecb_le_to_host (ecb_peek <T> (ptr)); }
788     template<typename T> inline T ecb_peek_u (const void *ptr) { T v; memcpy (&v, ptr, sizeof (v)); return v; }
789     template<typename T> inline T ecb_peek_be_u (const void *ptr) { return ecb_be_to_host (ecb_peek_u<T> (ptr)); }
790     template<typename T> inline T ecb_peek_le_u (const void *ptr) { return ecb_le_to_host (ecb_peek_u<T> (ptr)); }
791    
792     template<typename T> inline T ecb_host_to_be (T v) { return ecb_little_endian () ? ecb_bswap (v) : v; }
793     template<typename T> inline T ecb_host_to_le (T v) { return ecb_big_endian () ? ecb_bswap (v) : v; }
794     template<typename T> inline void ecb_poke (void *ptr, T v) { *(T *)ptr = v; }
795     template<typename T> inline void ecb_poke_be (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_be (v)); }
796     template<typename T> inline void ecb_poke_le (void *ptr, T v) { return ecb_poke <T> (ptr, ecb_host_to_le (v)); }
797     template<typename T> inline void ecb_poke_u (void *ptr, T v) { memcpy (ptr, &v, sizeof (v)); }
798     template<typename T> inline void ecb_poke_be_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_be (v)); }
799     template<typename T> inline void ecb_poke_le_u (void *ptr, T v) { return ecb_poke_u<T> (ptr, ecb_host_to_le (v)); }
800    
801     #endif
802    
803     /*****************************************************************************/
804     /* division */
805    
806 root 1.1 #if ECB_GCC_VERSION(3,0) || ECB_C99
807 root 1.4 /* C99 tightened the definition of %, so we can use a more efficient version */
808 root 1.1 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
809     #else
810     #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
811     #endif
812    
813     #if ECB_CPP
814     template<typename T>
815     static inline T ecb_div_rd (T val, T div)
816     {
817     return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
818     }
819     template<typename T>
820     static inline T ecb_div_ru (T val, T div)
821     {
822     return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
823     }
824     #else
825     #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
826     #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
827     #endif
828    
829 root 1.4 /*****************************************************************************/
830     /* array length */
831    
832 root 1.1 #if ecb_cplusplus_does_not_suck
833     /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
834     template<typename T, int N>
835     static inline int ecb_array_length (const T (&arr)[N])
836     {
837     return N;
838     }
839     #else
840     #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
841     #endif
842    
843 root 1.4 /*****************************************************************************/
844     /* IEEE 754-2008 half float conversions */
845    
846 root 1.1 ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
847     ecb_function_ ecb_const uint32_t
848     ecb_binary16_to_binary32 (uint32_t x)
849     {
850     unsigned int s = (x & 0x8000) << (31 - 15);
851     int e = (x >> 10) & 0x001f;
852     unsigned int m = x & 0x03ff;
853    
854     if (ecb_expect_false (e == 31))
855     /* infinity or NaN */
856     e = 255 - (127 - 15);
857     else if (ecb_expect_false (!e))
858     {
859     if (ecb_expect_true (!m))
860     /* zero, handled by code below by forcing e to 0 */
861     e = 0 - (127 - 15);
862     else
863     {
864     /* subnormal, renormalise */
865     unsigned int s = 10 - ecb_ld32 (m);
866    
867     m = (m << s) & 0x3ff; /* mask implicit bit */
868     e -= s - 1;
869     }
870     }
871    
872     /* e and m now are normalised, or zero, (or inf or nan) */
873     e += 127 - 15;
874    
875     return s | (e << 23) | (m << (23 - 10));
876     }
877    
878     ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
879     ecb_function_ ecb_const uint16_t
880     ecb_binary32_to_binary16 (uint32_t x)
881     {
882     unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
883     unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
884     unsigned int m = x & 0x007fffff;
885    
886     x &= 0x7fffffff;
887    
888     /* if it's within range of binary16 normals, use fast path */
889     if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
890     {
891     /* mantissa round-to-even */
892     m += 0x00000fff + ((m >> (23 - 10)) & 1);
893    
894     /* handle overflow */
895     if (ecb_expect_false (m >= 0x00800000))
896     {
897     m >>= 1;
898     e += 1;
899     }
900    
901     return s | (e << 10) | (m >> (23 - 10));
902     }
903    
904     /* handle large numbers and infinity */
905     if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
906     return s | 0x7c00;
907    
908     /* handle zero, subnormals and small numbers */
909     if (ecb_expect_true (x < 0x38800000))
910     {
911     /* zero */
912     if (ecb_expect_true (!x))
913     return s;
914    
915     /* handle subnormals */
916    
917     /* too small, will be zero */
918     if (e < (14 - 24)) /* might not be sharp, but is good enough */
919     return s;
920    
921     m |= 0x00800000; /* make implicit bit explicit */
922    
923     /* very tricky - we need to round to the nearest e (+10) bit value */
924     {
925     unsigned int bits = 14 - e;
926     unsigned int half = (1 << (bits - 1)) - 1;
927     unsigned int even = (m >> bits) & 1;
928    
929     /* if this overflows, we will end up with a normalised number */
930     m = (m + half + even) >> bits;
931     }
932    
933     return s | m;
934     }
935    
936     /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
937     m >>= 13;
938    
939     return s | 0x7c00 | m | !m;
940     }
941    
942     /*******************************************************************************/
943     /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
944    
945     /* basically, everything uses "ieee pure-endian" floating point numbers */
946     /* the only noteworthy exception is ancient armle, which uses order 43218765 */
947     #if 0 \
948     || __i386 || __i386__ \
949     || ECB_GCC_AMD64 \
950     || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
951     || defined __s390__ || defined __s390x__ \
952     || defined __mips__ \
953     || defined __alpha__ \
954     || defined __hppa__ \
955     || defined __ia64__ \
956     || defined __m68k__ \
957     || defined __m88k__ \
958     || defined __sh__ \
959     || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
960     || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
961     || defined __aarch64__
962     #define ECB_STDFP 1
963     #else
964     #define ECB_STDFP 0
965     #endif
966    
967     #ifndef ECB_NO_LIBM
968    
969     #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
970    
971     /* only the oldest of old doesn't have this one. solaris. */
972     #ifdef INFINITY
973     #define ECB_INFINITY INFINITY
974     #else
975     #define ECB_INFINITY HUGE_VAL
976     #endif
977    
978     #ifdef NAN
979     #define ECB_NAN NAN
980     #else
981     #define ECB_NAN ECB_INFINITY
982     #endif
983    
984     #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
985     #define ecb_ldexpf(x,e) ldexpf ((x), (e))
986     #define ecb_frexpf(x,e) frexpf ((x), (e))
987     #else
988     #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
989     #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
990     #endif
991    
992     /* convert a float to ieee single/binary32 */
993     ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
994     ecb_function_ ecb_const uint32_t
995     ecb_float_to_binary32 (float x)
996     {
997     uint32_t r;
998    
999     #if ECB_STDFP
1000     memcpy (&r, &x, 4);
1001     #else
1002     /* slow emulation, works for anything but -0 */
1003     uint32_t m;
1004     int e;
1005    
1006     if (x == 0e0f ) return 0x00000000U;
1007     if (x > +3.40282346638528860e+38f) return 0x7f800000U;
1008     if (x < -3.40282346638528860e+38f) return 0xff800000U;
1009     if (x != x ) return 0x7fbfffffU;
1010    
1011     m = ecb_frexpf (x, &e) * 0x1000000U;
1012    
1013     r = m & 0x80000000U;
1014    
1015     if (r)
1016     m = -m;
1017    
1018     if (e <= -126)
1019     {
1020     m &= 0xffffffU;
1021     m >>= (-125 - e);
1022     e = -126;
1023     }
1024    
1025     r |= (e + 126) << 23;
1026     r |= m & 0x7fffffU;
1027     #endif
1028    
1029     return r;
1030     }
1031    
1032     /* converts an ieee single/binary32 to a float */
1033     ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
1034     ecb_function_ ecb_const float
1035     ecb_binary32_to_float (uint32_t x)
1036     {
1037     float r;
1038    
1039     #if ECB_STDFP
1040     memcpy (&r, &x, 4);
1041     #else
1042     /* emulation, only works for normals and subnormals and +0 */
1043     int neg = x >> 31;
1044     int e = (x >> 23) & 0xffU;
1045    
1046     x &= 0x7fffffU;
1047    
1048     if (e)
1049     x |= 0x800000U;
1050     else
1051     e = 1;
1052    
1053     /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
1054     r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
1055    
1056     r = neg ? -r : r;
1057     #endif
1058    
1059     return r;
1060     }
1061    
1062     /* convert a double to ieee double/binary64 */
1063     ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
1064     ecb_function_ ecb_const uint64_t
1065     ecb_double_to_binary64 (double x)
1066     {
1067     uint64_t r;
1068    
1069     #if ECB_STDFP
1070     memcpy (&r, &x, 8);
1071     #else
1072     /* slow emulation, works for anything but -0 */
1073     uint64_t m;
1074     int e;
1075    
1076     if (x == 0e0 ) return 0x0000000000000000U;
1077     if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
1078     if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
1079     if (x != x ) return 0X7ff7ffffffffffffU;
1080    
1081     m = frexp (x, &e) * 0x20000000000000U;
1082    
1083     r = m & 0x8000000000000000;;
1084    
1085     if (r)
1086     m = -m;
1087    
1088     if (e <= -1022)
1089     {
1090     m &= 0x1fffffffffffffU;
1091     m >>= (-1021 - e);
1092     e = -1022;
1093     }
1094    
1095     r |= ((uint64_t)(e + 1022)) << 52;
1096     r |= m & 0xfffffffffffffU;
1097     #endif
1098    
1099     return r;
1100     }
1101    
1102     /* converts an ieee double/binary64 to a double */
1103     ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
1104     ecb_function_ ecb_const double
1105     ecb_binary64_to_double (uint64_t x)
1106     {
1107     double r;
1108    
1109     #if ECB_STDFP
1110     memcpy (&r, &x, 8);
1111     #else
1112     /* emulation, only works for normals and subnormals and +0 */
1113     int neg = x >> 63;
1114     int e = (x >> 52) & 0x7ffU;
1115    
1116     x &= 0xfffffffffffffU;
1117    
1118     if (e)
1119     x |= 0x10000000000000U;
1120     else
1121     e = 1;
1122    
1123     /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
1124     r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
1125    
1126     r = neg ? -r : r;
1127     #endif
1128    
1129     return r;
1130     }
1131    
1132     /* convert a float to ieee half/binary16 */
1133     ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
1134     ecb_function_ ecb_const uint16_t
1135     ecb_float_to_binary16 (float x)
1136     {
1137     return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
1138     }
1139    
1140     /* convert an ieee half/binary16 to float */
1141     ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
1142     ecb_function_ ecb_const float
1143     ecb_binary16_to_float (uint16_t x)
1144     {
1145     return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
1146     }
1147    
1148     #endif
1149    
1150     #endif
1151