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Revision: 1.126
Committed: Sun Jan 5 02:58:29 2014 UTC (10 years, 5 months ago) by root
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Branch: MAIN
Changes since 1.125: +6 -0 lines
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# User Rev Content
1 root 1.1 /*
2 root 1.17 * libecb - http://software.schmorp.de/pkg/libecb
3 root 1.1 *
4 root 1.123 * Copyright (©) 2009-2013 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     */
29    
30     #ifndef ECB_H
31     #define ECB_H
32    
33 root 1.87 /* 16 bits major, 16 bits minor */
34 root 1.114 #define ECB_VERSION 0x00010003
35 root 1.87
36 root 1.44 #ifdef _WIN32
37     typedef signed char int8_t;
38     typedef unsigned char uint8_t;
39     typedef signed short int16_t;
40     typedef unsigned short uint16_t;
41     typedef signed int int32_t;
42     typedef unsigned int uint32_t;
43     #if __GNUC__
44     typedef signed long long int64_t;
45     typedef unsigned long long uint64_t;
46 root 1.51 #else /* _MSC_VER || __BORLANDC__ */
47 root 1.44 typedef signed __int64 int64_t;
48     typedef unsigned __int64 uint64_t;
49     #endif
50 root 1.87 #ifdef _WIN64
51     #define ECB_PTRSIZE 8
52     typedef uint64_t uintptr_t;
53     typedef int64_t intptr_t;
54     #else
55     #define ECB_PTRSIZE 4
56     typedef uint32_t uintptr_t;
57     typedef int32_t intptr_t;
58     #endif
59 root 1.44 #else
60     #include <inttypes.h>
61 root 1.87 #if UINTMAX_MAX > 0xffffffffU
62     #define ECB_PTRSIZE 8
63     #else
64     #define ECB_PTRSIZE 4
65     #endif
66 root 1.44 #endif
67 root 1.6
68 root 1.114 /* work around x32 idiocy by defining proper macros */
69 root 1.125 #if __amd64 || __x86_64 || _M_AMD64 || _M_X64
70 root 1.119 #if _ILP32
71 root 1.115 #define ECB_AMD64_X32 1
72 root 1.114 #else
73 root 1.115 #define ECB_AMD64 1
74 root 1.114 #endif
75     #endif
76    
77 root 1.12 /* many compilers define _GNUC_ to some versions but then only implement
78     * what their idiot authors think are the "more important" extensions,
79 sf-exg 1.59 * causing enormous grief in return for some better fake benchmark numbers.
80 root 1.18 * or so.
81 root 1.12 * we try to detect these and simply assume they are not gcc - if they have
82     * an issue with that they should have done it right in the first place.
83     */
84 root 1.14 #ifndef ECB_GCC_VERSION
85 root 1.85 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
86 root 1.37 #define ECB_GCC_VERSION(major,minor) 0
87     #else
88     #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
89     #endif
90 root 1.12 #endif
91 root 1.1
92 root 1.91 #define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
93     #define ECB_C99 (__STDC_VERSION__ >= 199901L)
94     #define ECB_C11 (__STDC_VERSION__ >= 201112L)
95     #define ECB_CPP (__cplusplus+0)
96     #define ECB_CPP11 (__cplusplus >= 201103L)
97 root 1.90
98 root 1.102 #if ECB_CPP
99     #define ECB_EXTERN_C extern "C"
100     #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
101     #define ECB_EXTERN_C_END }
102     #else
103     #define ECB_EXTERN_C extern
104     #define ECB_EXTERN_C_BEG
105     #define ECB_EXTERN_C_END
106     #endif
107    
108 root 1.52 /*****************************************************************************/
109    
110 root 1.58 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
111     /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
112    
113 root 1.79 #if ECB_NO_THREADS
114 root 1.95 #define ECB_NO_SMP 1
115 root 1.79 #endif
116    
117 root 1.93 #if ECB_NO_SMP
118 root 1.64 #define ECB_MEMORY_FENCE do { } while (0)
119 root 1.58 #endif
120    
121 root 1.52 #ifndef ECB_MEMORY_FENCE
122 root 1.85 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
123 root 1.73 #if __i386 || __i386__
124 root 1.54 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
125 root 1.94 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
126     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
127 root 1.73 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
128 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
129     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
130     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
131 root 1.63 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
132 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
133 root 1.85 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
134     || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
135 root 1.84 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
136 root 1.85 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
137 root 1.94 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
138     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
139 root 1.124 #elif (__sparc || __sparc__) && !__sparcv8
140 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
141     #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
142     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
143 root 1.85 #elif defined __s390__ || defined __s390x__
144 root 1.77 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
145 root 1.85 #elif defined __mips__
146 root 1.118 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
147 root 1.116 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
148     #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
149 root 1.86 #elif defined __alpha__
150 root 1.94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
151     #elif defined __hppa__
152     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
153     #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
154     #elif defined __ia64__
155     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
156 root 1.117 #elif defined __m68k__
157     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
158     #elif defined __m88k__
159     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
160     #elif defined __sh__
161     #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
162 root 1.52 #endif
163     #endif
164     #endif
165    
166     #ifndef ECB_MEMORY_FENCE
167 root 1.93 #if ECB_GCC_VERSION(4,7)
168 root 1.97 /* see comment below (stdatomic.h) about the C11 memory model. */
169 root 1.93 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
170 root 1.110
171     /* The __has_feature syntax from clang is so misdesigned that we cannot use it
172     * without risking compile time errors with other compilers. We *could*
173     * define our own ecb_clang_has_feature, but I just can't be bothered to work
174 root 1.112 * around this shit time and again.
175 root 1.110 * #elif defined __clang && __has_feature (cxx_atomic)
176     * // see comment below (stdatomic.h) about the C11 memory model.
177     * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
178     */
179    
180 root 1.93 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
181 root 1.52 #define ECB_MEMORY_FENCE __sync_synchronize ()
182 root 1.126 #elif _MSC_VER >= 1500 /* VC++ 2008 */
183     /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
184     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
185     #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
186     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
187     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
188 root 1.57 #elif _MSC_VER >= 1400 /* VC++ 2005 */
189     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
190     #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
191     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
192     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
193 root 1.85 #elif defined _WIN32
194 root 1.55 #include <WinNT.h>
195 root 1.57 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
196 root 1.72 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
197     #include <mbarrier.h>
198     #define ECB_MEMORY_FENCE __machine_rw_barrier ()
199     #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
200     #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
201 root 1.82 #elif __xlC__
202 root 1.83 #define ECB_MEMORY_FENCE __sync ()
203 root 1.52 #endif
204     #endif
205    
206 root 1.53 #ifndef ECB_MEMORY_FENCE
207 root 1.94 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
208     /* we assume that these memory fences work on all variables/all memory accesses, */
209     /* not just C11 atomics and atomic accesses */
210     #include <stdatomic.h>
211 root 1.97 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
212     /* any fence other than seq_cst, which isn't very efficient for us. */
213     /* Why that is, we don't know - either the C11 memory model is quite useless */
214     /* for most usages, or gcc and clang have a bug */
215     /* I *currently* lean towards the latter, and inefficiently implement */
216     /* all three of ecb's fences as a seq_cst fence */
217 root 1.94 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
218     #endif
219     #endif
220    
221     #ifndef ECB_MEMORY_FENCE
222 root 1.62 #if !ECB_AVOID_PTHREADS
223     /*
224     * if you get undefined symbol references to pthread_mutex_lock,
225     * or failure to find pthread.h, then you should implement
226     * the ECB_MEMORY_FENCE operations for your cpu/compiler
227     * OR provide pthread.h and link against the posix thread library
228     * of your system.
229     */
230     #include <pthread.h>
231     #define ECB_NEEDS_PTHREADS 1
232     #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
233 root 1.52
234 root 1.62 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
235     #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
236     #endif
237     #endif
238    
239 root 1.85 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
240 root 1.52 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
241 root 1.62 #endif
242    
243 root 1.85 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
244 root 1.52 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
245     #endif
246    
247     /*****************************************************************************/
248    
249 root 1.39 #if __cplusplus
250 root 1.46 #define ecb_inline static inline
251 root 1.38 #elif ECB_GCC_VERSION(2,5)
252 root 1.46 #define ecb_inline static __inline__
253 root 1.39 #elif ECB_C99
254 root 1.46 #define ecb_inline static inline
255 root 1.29 #else
256 root 1.46 #define ecb_inline static
257 root 1.38 #endif
258    
259     #if ECB_GCC_VERSION(3,3)
260     #define ecb_restrict __restrict__
261 root 1.39 #elif ECB_C99
262 root 1.38 #define ecb_restrict restrict
263     #else
264     #define ecb_restrict
265 root 1.4 #endif
266    
267 root 1.38 typedef int ecb_bool;
268    
269 root 1.8 #define ECB_CONCAT_(a, b) a ## b
270     #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
271     #define ECB_STRINGIFY_(a) # a
272     #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
273    
274 root 1.46 #define ecb_function_ ecb_inline
275 root 1.3
276 root 1.1 #if ECB_GCC_VERSION(3,1)
277 root 1.37 #define ecb_attribute(attrlist) __attribute__(attrlist)
278     #define ecb_is_constant(expr) __builtin_constant_p (expr)
279     #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
280     #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
281     #else
282     #define ecb_attribute(attrlist)
283     #define ecb_is_constant(expr) 0
284     #define ecb_expect(expr,value) (expr)
285     #define ecb_prefetch(addr,rw,locality)
286 root 1.1 #endif
287    
288 root 1.2 /* no emulation for ecb_decltype */
289 root 1.1 #if ECB_GCC_VERSION(4,5)
290 root 1.37 #define ecb_decltype(x) __decltype(x)
291 root 1.1 #elif ECB_GCC_VERSION(3,0)
292 root 1.39 #define ecb_decltype(x) __typeof(x)
293 root 1.1 #endif
294    
295 root 1.24 #define ecb_noinline ecb_attribute ((__noinline__))
296     #define ecb_unused ecb_attribute ((__unused__))
297     #define ecb_const ecb_attribute ((__const__))
298     #define ecb_pure ecb_attribute ((__pure__))
299 root 1.35
300 root 1.90 #if ECB_C11
301     #define ecb_noreturn _Noreturn
302     #else
303     #define ecb_noreturn ecb_attribute ((__noreturn__))
304     #endif
305    
306 root 1.35 #if ECB_GCC_VERSION(4,3)
307 root 1.39 #define ecb_artificial ecb_attribute ((__artificial__))
308     #define ecb_hot ecb_attribute ((__hot__))
309     #define ecb_cold ecb_attribute ((__cold__))
310 root 1.35 #else
311     #define ecb_artificial
312     #define ecb_hot
313     #define ecb_cold
314     #endif
315 root 1.1
316 root 1.39 /* put around conditional expressions if you are very sure that the */
317     /* expression is mostly true or mostly false. note that these return */
318     /* booleans, not the expression. */
319 root 1.33 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
320     #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
321 root 1.36 /* for compatibility to the rest of the world */
322 root 1.33 #define ecb_likely(expr) ecb_expect_true (expr)
323     #define ecb_unlikely(expr) ecb_expect_false (expr)
324 root 1.1
325 root 1.3 /* count trailing zero bits and count # of one bits */
326 root 1.1 #if ECB_GCC_VERSION(3,4)
327 root 1.49 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
328     #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
329     #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
330 root 1.35 #define ecb_ctz32(x) __builtin_ctz (x)
331 root 1.49 #define ecb_ctz64(x) __builtin_ctzll (x)
332 root 1.35 #define ecb_popcount32(x) __builtin_popcount (x)
333 root 1.49 /* no popcountll */
334 root 1.1 #else
335 root 1.39 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
336     ecb_function_ int
337 root 1.35 ecb_ctz32 (uint32_t x)
338     {
339     int r = 0;
340    
341 root 1.48 x &= ~x + 1; /* this isolates the lowest bit */
342 root 1.35
343 root 1.50 #if ECB_branchless_on_i386
344     r += !!(x & 0xaaaaaaaa) << 0;
345     r += !!(x & 0xcccccccc) << 1;
346     r += !!(x & 0xf0f0f0f0) << 2;
347     r += !!(x & 0xff00ff00) << 3;
348     r += !!(x & 0xffff0000) << 4;
349     #else
350 root 1.35 if (x & 0xaaaaaaaa) r += 1;
351     if (x & 0xcccccccc) r += 2;
352     if (x & 0xf0f0f0f0) r += 4;
353     if (x & 0xff00ff00) r += 8;
354     if (x & 0xffff0000) r += 16;
355 root 1.50 #endif
356 root 1.35
357     return r;
358     }
359    
360 root 1.49 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
361     ecb_function_ int
362     ecb_ctz64 (uint64_t x)
363     {
364     int shift = x & 0xffffffffU ? 0 : 32;
365 root 1.50 return ecb_ctz32 (x >> shift) + shift;
366 root 1.49 }
367    
368 root 1.39 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
369     ecb_function_ int
370 root 1.35 ecb_popcount32 (uint32_t x)
371     {
372     x -= (x >> 1) & 0x55555555;
373     x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
374     x = ((x >> 4) + x) & 0x0f0f0f0f;
375     x *= 0x01010101;
376 root 1.1
377 root 1.35 return x >> 24;
378     }
379 root 1.49
380     ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
381     ecb_function_ int ecb_ld32 (uint32_t x)
382     {
383 root 1.50 int r = 0;
384 root 1.49
385 root 1.50 if (x >> 16) { x >>= 16; r += 16; }
386     if (x >> 8) { x >>= 8; r += 8; }
387     if (x >> 4) { x >>= 4; r += 4; }
388     if (x >> 2) { x >>= 2; r += 2; }
389     if (x >> 1) { r += 1; }
390 root 1.49
391     return r;
392     }
393    
394     ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
395     ecb_function_ int ecb_ld64 (uint64_t x)
396     {
397 root 1.50 int r = 0;
398 root 1.49
399 root 1.50 if (x >> 32) { x >>= 32; r += 32; }
400 root 1.49
401 root 1.50 return r + ecb_ld32 (x);
402 root 1.49 }
403 root 1.1 #endif
404    
405 root 1.88 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
406     ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
407     ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
408     ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
409    
410 root 1.71 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
411 root 1.70 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
412     {
413     return ( (x * 0x0802U & 0x22110U)
414     | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
415     }
416    
417 root 1.71 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
418 root 1.70 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
419     {
420     x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
421     x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
422     x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
423     x = ( x >> 8 ) | ( x << 8);
424    
425     return x;
426     }
427    
428 root 1.71 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
429 root 1.70 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
430     {
431     x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
432     x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
433     x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
434     x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
435     x = ( x >> 16 ) | ( x << 16);
436    
437     return x;
438     }
439    
440 root 1.49 /* popcount64 is only available on 64 bit cpus as gcc builtin */
441     /* so for this version we are lazy */
442     ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
443     ecb_function_ int
444     ecb_popcount64 (uint64_t x)
445     {
446     return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
447     }
448    
449 root 1.50 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
450     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
451     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
452     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
453     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
454     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
455     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
456     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
457    
458     ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
459     ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
460     ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
461     ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
462     ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
463     ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
464     ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
465     ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
466    
467 root 1.13 #if ECB_GCC_VERSION(4,3)
468 root 1.49 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
469     #define ecb_bswap32(x) __builtin_bswap32 (x)
470     #define ecb_bswap64(x) __builtin_bswap64 (x)
471 root 1.13 #else
472 root 1.50 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
473     ecb_function_ uint16_t
474     ecb_bswap16 (uint16_t x)
475 root 1.49 {
476 root 1.50 return ecb_rotl16 (x, 8);
477 root 1.49 }
478    
479 root 1.39 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
480     ecb_function_ uint32_t
481 root 1.35 ecb_bswap32 (uint32_t x)
482     {
483 root 1.50 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
484 root 1.35 }
485    
486 root 1.49 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
487     ecb_function_ uint64_t
488     ecb_bswap64 (uint64_t x)
489 root 1.35 {
490 root 1.50 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
491 root 1.35 }
492 root 1.13 #endif
493    
494     #if ECB_GCC_VERSION(4,5)
495 root 1.35 #define ecb_unreachable() __builtin_unreachable ()
496 root 1.13 #else
497 root 1.35 /* this seems to work fine, but gcc always emits a warning for it :/ */
498 root 1.75 ecb_inline void ecb_unreachable (void) ecb_noreturn;
499     ecb_inline void ecb_unreachable (void) { }
500 root 1.13 #endif
501    
502 root 1.41 /* try to tell the compiler that some condition is definitely true */
503 root 1.100 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
504 root 1.41
505 root 1.76 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
506     ecb_inline unsigned char
507 root 1.23 ecb_byteorder_helper (void)
508 root 1.3 {
509 root 1.98 /* the union code still generates code under pressure in gcc, */
510 sf-exg 1.111 /* but less than using pointers, and always seems to */
511 root 1.98 /* successfully return a constant. */
512     /* the reason why we have this horrible preprocessor mess */
513 root 1.99 /* is to avoid it in all cases, at least on common architectures */
514 sf-exg 1.111 /* or when using a recent enough gcc version (>= 4.6) */
515 root 1.98 #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
516     return 0x44;
517     #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
518     return 0x44;
519     #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
520 root 1.113 return 0x11;
521 root 1.98 #else
522     union
523     {
524     uint32_t i;
525     uint8_t c;
526     } u = { 0x11223344 };
527     return u.c;
528     #endif
529 root 1.3 }
530    
531 root 1.76 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
532     ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
533     ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
534     ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
535 root 1.3
536 root 1.39 #if ECB_GCC_VERSION(3,0) || ECB_C99
537 root 1.35 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
538 root 1.31 #else
539 root 1.35 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
540 root 1.31 #endif
541 root 1.21
542 sf-exg 1.68 #if __cplusplus
543     template<typename T>
544     static inline T ecb_div_rd (T val, T div)
545     {
546     return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
547     }
548     template<typename T>
549     static inline T ecb_div_ru (T val, T div)
550     {
551     return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
552     }
553     #else
554     #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
555     #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
556     #endif
557 sf-exg 1.67
558 root 1.5 #if ecb_cplusplus_does_not_suck
559 root 1.40 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
560 root 1.35 template<typename T, int N>
561     static inline int ecb_array_length (const T (&arr)[N])
562     {
563     return N;
564     }
565 root 1.5 #else
566 root 1.35 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
567 root 1.5 #endif
568    
569 root 1.104 /*******************************************************************************/
570     /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
571    
572     /* basically, everything uses "ieee pure-endian" floating point numbers */
573     /* the only noteworthy exception is ancient armle, which uses order 43218765 */
574     #if 0 \
575     || __i386 || __i386__ \
576     || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
577     || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
578     || defined __arm__ && defined __ARM_EABI__ \
579     || defined __s390__ || defined __s390x__ \
580     || defined __mips__ \
581     || defined __alpha__ \
582     || defined __hppa__ \
583     || defined __ia64__ \
584 root 1.117 || defined __m68k__ \
585     || defined __m88k__ \
586     || defined __sh__ \
587 root 1.104 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
588     #define ECB_STDFP 1
589     #include <string.h> /* for memcpy */
590 root 1.102 #else
591 root 1.104 #define ECB_STDFP 0
592 root 1.102 #endif
593    
594 root 1.104 #ifndef ECB_NO_LIBM
595 root 1.103
596 root 1.121 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
597    
598 root 1.122 /* only the oldest of old doesn't have this one. solaris. */
599     #ifdef INFINITY
600     #define ECB_INFINITY INFINITY
601     #else
602     #define ECB_INFINITY HUGE_VAL
603     #endif
604    
605     #ifdef NAN
606 root 1.121 #define ECB_NAN NAN
607     #else
608 root 1.122 #define ECB_NAN ECB_INFINITY
609 root 1.121 #endif
610 root 1.120
611     /* converts an ieee half/binary16 to a float */
612     ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
613     ecb_function_ float
614     ecb_binary16_to_float (uint16_t x)
615     {
616     int e = (x >> 10) & 0x1f;
617     int m = x & 0x3ff;
618     float r;
619    
620 root 1.121 if (!e ) r = ldexpf (m , -24);
621     else if (e != 31) r = ldexpf (m + 0x400, e - 25);
622     else if (m ) r = ECB_NAN;
623 root 1.123 else r = ECB_INFINITY;
624 root 1.120
625     return x & 0x8000 ? -r : r;
626     }
627    
628 root 1.104 /* convert a float to ieee single/binary32 */
629 root 1.103 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
630     ecb_function_ uint32_t
631     ecb_float_to_binary32 (float x)
632     {
633     uint32_t r;
634    
635     #if ECB_STDFP
636 root 1.104 memcpy (&r, &x, 4);
637 root 1.103 #else
638 root 1.105 /* slow emulation, works for anything but -0 */
639 root 1.103 uint32_t m;
640     int e;
641    
642 root 1.108 if (x == 0e0f ) return 0x00000000U;
643 root 1.103 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
644     if (x < -3.40282346638528860e+38f) return 0xff800000U;
645 root 1.105 if (x != x ) return 0x7fbfffffU;
646 root 1.103
647     m = frexpf (x, &e) * 0x1000000U;
648    
649     r = m & 0x80000000U;
650    
651     if (r)
652     m = -m;
653    
654 root 1.108 if (e <= -126)
655 root 1.103 {
656     m &= 0xffffffU;
657     m >>= (-125 - e);
658     e = -126;
659     }
660    
661     r |= (e + 126) << 23;
662     r |= m & 0x7fffffU;
663     #endif
664    
665     return r;
666     }
667    
668 root 1.104 /* converts an ieee single/binary32 to a float */
669 root 1.103 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
670     ecb_function_ float
671     ecb_binary32_to_float (uint32_t x)
672     {
673     float r;
674    
675     #if ECB_STDFP
676 root 1.104 memcpy (&r, &x, 4);
677 root 1.103 #else
678     /* emulation, only works for normals and subnormals and +0 */
679     int neg = x >> 31;
680     int e = (x >> 23) & 0xffU;
681    
682     x &= 0x7fffffU;
683    
684     if (e)
685     x |= 0x800000U;
686 root 1.104 else
687     e = 1;
688 root 1.103
689     /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
690 root 1.108 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
691 root 1.103
692     r = neg ? -r : r;
693     #endif
694    
695     return r;
696     }
697    
698 root 1.104 /* convert a double to ieee double/binary64 */
699 root 1.103 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
700     ecb_function_ uint64_t
701     ecb_double_to_binary64 (double x)
702     {
703 root 1.104 uint64_t r;
704    
705     #if ECB_STDFP
706     memcpy (&r, &x, 8);
707     #else
708 root 1.105 /* slow emulation, works for anything but -0 */
709 root 1.104 uint64_t m;
710     int e;
711    
712 root 1.108 if (x == 0e0 ) return 0x0000000000000000U;
713 root 1.104 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
714     if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
715 root 1.105 if (x != x ) return 0X7ff7ffffffffffffU;
716 root 1.104
717     m = frexp (x, &e) * 0x20000000000000U;
718    
719     r = m & 0x8000000000000000;;
720    
721     if (r)
722     m = -m;
723    
724 root 1.108 if (e <= -1022)
725 root 1.104 {
726     m &= 0x1fffffffffffffU;
727     m >>= (-1021 - e);
728     e = -1022;
729     }
730    
731     r |= ((uint64_t)(e + 1022)) << 52;
732     r |= m & 0xfffffffffffffU;
733     #endif
734    
735     return r;
736     }
737    
738     /* converts an ieee double/binary64 to a double */
739     ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
740     ecb_function_ double
741     ecb_binary64_to_double (uint64_t x)
742     {
743     double r;
744    
745     #if ECB_STDFP
746     memcpy (&r, &x, 8);
747     #else
748     /* emulation, only works for normals and subnormals and +0 */
749     int neg = x >> 63;
750     int e = (x >> 52) & 0x7ffU;
751    
752     x &= 0xfffffffffffffU;
753    
754     if (e)
755     x |= 0x10000000000000U;
756     else
757     e = 1;
758    
759 root 1.107 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
760 root 1.108 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
761 root 1.104
762     r = neg ? -r : r;
763     #endif
764    
765     return r;
766 root 1.103 }
767    
768     #endif
769 root 1.102
770 root 1.1 #endif
771