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Revision 1.11 by root, Thu May 26 18:00:42 2011 UTC vs.
Revision 1.168 by root, Sat Nov 21 18:09:36 2015 UTC

1/* 1/*
2 * libecb 2 * libecb - http://software.schmorp.de/pkg/libecb
3 * 3 *
4 * Copyright (©) 2009-2011 Marc Alexander Lehmann 4 * Copyright (©) 2009-2015 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta 5 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved. 6 * All rights reserved.
7 * 7 *
8 * Redistribution and use in source and binary forms, with or without modifica- 8 * Redistribution and use in source and binary forms, with or without modifica-
9 * tion, are permitted provided that the following conditions are met: 9 * tion, are permitted provided that the following conditions are met:
… …
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 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, 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- 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 26 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE. 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.
28 */ 39 */
29 40
30#ifndef ECB_H 41#ifndef ECB_H
31#define ECB_H 42#define ECB_H
32 43
44/* 16 bits major, 16 bits minor */
45#define ECB_VERSION 0x00010005
46
47#ifdef _WIN32
48 typedef signed char int8_t;
49 typedef unsigned char uint8_t;
50 typedef signed short int16_t;
51 typedef unsigned short uint16_t;
52 typedef signed int int32_t;
53 typedef unsigned int uint32_t;
54 #if __GNUC__
55 typedef signed long long int64_t;
56 typedef unsigned long long uint64_t;
57 #else /* _MSC_VER || __BORLANDC__ */
58 typedef signed __int64 int64_t;
59 typedef unsigned __int64 uint64_t;
60 #endif
61 #ifdef _WIN64
62 #define ECB_PTRSIZE 8
63 typedef uint64_t uintptr_t;
64 typedef int64_t intptr_t;
65 #else
66 #define ECB_PTRSIZE 4
67 typedef uint32_t uintptr_t;
68 typedef int32_t intptr_t;
69 #endif
70#else
33#include <inttypes.h> 71 #include <inttypes.h>
72 #if UINTMAX_MAX > 0xffffffffU
73 #define ECB_PTRSIZE 8
74 #else
75 #define ECB_PTRSIZE 4
76 #endif
77#endif
34 78
79#define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
80#define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)
81
82/* work around x32 idiocy by defining proper macros */
83#if ECB_GCC_AMD64 || ECB_MSVC_AMD64
84 #if _ILP32
85 #define ECB_AMD64_X32 1
86 #else
87 #define ECB_AMD64 1
88 #endif
89#endif
90
91/* many compilers define _GNUC_ to some versions but then only implement
92 * what their idiot authors think are the "more important" extensions,
93 * causing enormous grief in return for some better fake benchmark numbers.
94 * or so.
95 * we try to detect these and simply assume they are not gcc - if they have
96 * an issue with that they should have done it right in the first place.
97 */
98#if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
99 #define ECB_GCC_VERSION(major,minor) 0
100#else
35#define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 101 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
102#endif
36 103
37#ifndef __cplusplus 104#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
38# if __STDC_VERSION__ >= 199901L 105
39# define ECB_INLINE inline 106#if __clang__ && defined __has_builtin
40typedef _Bool ecb_bool; 107 #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
41# else 108#else
42# define ECB_INLINE inline /* yeah! */ 109 #define ECB_CLANG_BUILTIN(x) 0
110#endif
111
112#if __clang__ && defined __has_extension
113 #define ECB_CLANG_EXTENSION(x) __has_extension (x)
114#else
115 #define ECB_CLANG_EXTENSION(x) 0
116#endif
117
118#define ECB_CPP (__cplusplus+0)
119#define ECB_CPP11 (__cplusplus >= 201103L)
120
121#if ECB_CPP
122 #define ECB_C 0
123 #define ECB_STDC_VERSION 0
124#else
125 #define ECB_C 1
126 #define ECB_STDC_VERSION __STDC_VERSION__
127#endif
128
129#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
130#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
131
132#if ECB_CPP
133 #define ECB_EXTERN_C extern "C"
134 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
135 #define ECB_EXTERN_C_END }
136#else
137 #define ECB_EXTERN_C extern
138 #define ECB_EXTERN_C_BEG
139 #define ECB_EXTERN_C_END
140#endif
141
142/*****************************************************************************/
143
144/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
145/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
146
147#if ECB_NO_THREADS
148 #define ECB_NO_SMP 1
149#endif
150
151#if ECB_NO_SMP
152 #define ECB_MEMORY_FENCE do { } while (0)
153#endif
154
155/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
156#if __xlC__ && ECB_CPP
157 #include <builtins.h>
158#endif
159
160#ifndef ECB_MEMORY_FENCE
161 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
162 #if __i386 || __i386__
163 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
164 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
165 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
166 #elif ECB_GCC_AMD64
167 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
168 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
169 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
170 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
172 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
173 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
174 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
175 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
176 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
177 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
178 #elif __aarch64__
179 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
180 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
181 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
182 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
183 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
184 #elif defined __s390__ || defined __s390x__
185 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
186 #elif defined __mips__
187 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
188 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
189 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
190 #elif defined __alpha__
191 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
192 #elif defined __hppa__
193 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
194 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
195 #elif defined __ia64__
196 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
197 #elif defined __m68k__
198 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
199 #elif defined __m88k__
200 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
201 #elif defined __sh__
202 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
203 #endif
204 #endif
205#endif
206
207#ifndef ECB_MEMORY_FENCE
208 #if ECB_GCC_VERSION(4,7)
209 /* see comment below (stdatomic.h) about the C11 memory model. */
210 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
211 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
212 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
213
214 #elif ECB_CLANG_EXTENSION(c_atomic)
215 /* see comment below (stdatomic.h) about the C11 memory model. */
216 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
217 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
218 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
219
220 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
221 #define ECB_MEMORY_FENCE __sync_synchronize ()
222 #elif _MSC_VER >= 1500 /* VC++ 2008 */
223 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
224 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
225 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
226 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
227 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
228 #elif _MSC_VER >= 1400 /* VC++ 2005 */
229 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
230 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
231 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
232 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
233 #elif defined _WIN32
234 #include <WinNT.h>
235 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
236 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
237 #include <mbarrier.h>
238 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
239 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
240 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
241 #elif __xlC__
242 #define ECB_MEMORY_FENCE __sync ()
243 #endif
244#endif
245
246#ifndef ECB_MEMORY_FENCE
247 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
248 /* we assume that these memory fences work on all variables/all memory accesses, */
249 /* not just C11 atomics and atomic accesses */
250 #include <stdatomic.h>
251 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
252 /* any fence other than seq_cst, which isn't very efficient for us. */
253 /* Why that is, we don't know - either the C11 memory model is quite useless */
254 /* for most usages, or gcc and clang have a bug */
255 /* I *currently* lean towards the latter, and inefficiently implement */
256 /* all three of ecb's fences as a seq_cst fence */
257 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
258 /* for all __atomic_thread_fence's except seq_cst */
259 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
260 #endif
261#endif
262
263#ifndef ECB_MEMORY_FENCE
264 #if !ECB_AVOID_PTHREADS
265 /*
266 * if you get undefined symbol references to pthread_mutex_lock,
267 * or failure to find pthread.h, then you should implement
268 * the ECB_MEMORY_FENCE operations for your cpu/compiler
269 * OR provide pthread.h and link against the posix thread library
270 * of your system.
271 */
272 #include <pthread.h>
273 #define ECB_NEEDS_PTHREADS 1
274 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
275
276 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
277 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
278 #endif
279#endif
280
281#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
282 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
283#endif
284
285#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
286 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
287#endif
288
289/*****************************************************************************/
290
291#if ECB_CPP
292 #define ecb_inline static inline
293#elif ECB_GCC_VERSION(2,5)
294 #define ecb_inline static __inline__
295#elif ECB_C99
296 #define ecb_inline static inline
297#else
298 #define ecb_inline static
299#endif
300
301#if ECB_GCC_VERSION(3,3)
302 #define ecb_restrict __restrict__
303#elif ECB_C99
304 #define ecb_restrict restrict
305#else
306 #define ecb_restrict
307#endif
308
43typedef int ecb_bool; 309typedef int ecb_bool;
44# endif
45#endif
46 310
47#define ECB_CONCAT_(a, b) a ## b 311#define ECB_CONCAT_(a, b) a ## b
48#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 312#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
49#define ECB_STRINGIFY_(a) # a 313#define ECB_STRINGIFY_(a) # a
50#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 314#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
315#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
51 316
52#define ECB_HEADER_INLINE static ECB_INLINE 317#define ecb_function_ ecb_inline
53 318
54#if ECB_GCC_VERSION(3,1) 319#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
55# define ecb_attribute(attrlist) __attribute__(attrlist) 320 #define ecb_attribute(attrlist) __attribute__ (attrlist)
321#else
322 #define ecb_attribute(attrlist)
323#endif
324
325#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
56# define ecb_is_constant(c) __builtin_constant_p (c) 326 #define ecb_is_constant(expr) __builtin_constant_p (expr)
327#else
328 /* possible C11 impl for integral types
329 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
330 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
331
332 #define ecb_is_constant(expr) 0
333#endif
334
335#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
57# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 336 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
337#else
338 #define ecb_expect(expr,value) (expr)
339#endif
340
341#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
58# define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 342 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
59#else 343#else
60# define ecb_attribute(attrlist)
61# define ecb_is_constant(c) 0
62# define ecb_expect(expr,value) (expr)
63# define ecb_prefetch(addr,rw,locality) 344 #define ecb_prefetch(addr,rw,locality)
64#endif 345#endif
65 346
66/* no emulation for ecb_decltype */ 347/* no emulation for ecb_decltype */
348#if ECB_CPP11
349 // older implementations might have problems with decltype(x)::type, work around it
350 template<class T> struct ecb_decltype_t { typedef T type; };
351 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
352#elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
353 #define ecb_decltype(x) __typeof__ (x)
354#endif
355
356#if _MSC_VER >= 1300
357 #define ecb_deprecated __declspec (deprecated)
358#else
359 #define ecb_deprecated ecb_attribute ((__deprecated__))
360#endif
361
362#if _MSC_VER >= 1500
363 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
67#if ECB_GCC_VERSION(4,5) 364#elif ECB_GCC_VERSION(4,5)
68# define ecb_decltype(x) __decltype(x) 365 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
69#elif ECB_GCC_VERSION(3,0) 366#else
70# define ecb_decltype(x) typeof(x) 367 #define ecb_deprecated_message(msg) ecb_deprecated
71#endif 368#endif
72 369
370#if _MSC_VER >= 1400
371 #define ecb_noinline __declspec (noinline)
372#else
73#define ecb_noinline ecb_attribute ((noinline)) 373 #define ecb_noinline ecb_attribute ((__noinline__))
74#define ecb_noreturn ecb_attribute ((noreturn)) 374#endif
375
75#define ecb_unused ecb_attribute ((unused)) 376#define ecb_unused ecb_attribute ((__unused__))
76#define ecb_const ecb_attribute ((const)) 377#define ecb_const ecb_attribute ((__const__))
77#define ecb_pure ecb_attribute ((pure)) 378#define ecb_pure ecb_attribute ((__pure__))
78#define ecb_hot ecb_attribute ((hot)) /* 4.3 */
79#define ecb_cold ecb_attribute ((cold)) /* 4.3 */
80 379
380#if ECB_C11 || __IBMC_NORETURN
381 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
382 #define ecb_noreturn _Noreturn
383#elif ECB_CPP11
384 #define ecb_noreturn [[noreturn]]
385#elif _MSC_VER >= 1200
386 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
387 #define ecb_noreturn __declspec (noreturn)
388#else
389 #define ecb_noreturn ecb_attribute ((__noreturn__))
390#endif
391
81#if ECB_GCC_VERSION(4,5) 392#if ECB_GCC_VERSION(4,3)
393 #define ecb_artificial ecb_attribute ((__artificial__))
394 #define ecb_hot ecb_attribute ((__hot__))
395 #define ecb_cold ecb_attribute ((__cold__))
396#else
397 #define ecb_artificial
398 #define ecb_hot
399 #define ecb_cold
400#endif
401
402/* put around conditional expressions if you are very sure that the */
403/* expression is mostly true or mostly false. note that these return */
404/* booleans, not the expression. */
405#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
406#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
407/* for compatibility to the rest of the world */
408#define ecb_likely(expr) ecb_expect_true (expr)
409#define ecb_unlikely(expr) ecb_expect_false (expr)
410
411/* count trailing zero bits and count # of one bits */
412#if ECB_GCC_VERSION(3,4) \
413 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
414 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
415 && ECB_CLANG_BUILTIN(__builtin_popcount))
416 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
417 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
418 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
419 #define ecb_ctz32(x) __builtin_ctz (x)
420 #define ecb_ctz64(x) __builtin_ctzll (x)
421 #define ecb_popcount32(x) __builtin_popcount (x)
422 /* no popcountll */
423#else
424 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
425 ecb_function_ ecb_const int
426 ecb_ctz32 (uint32_t x)
427 {
428 int r = 0;
429
430 x &= ~x + 1; /* this isolates the lowest bit */
431
432#if ECB_branchless_on_i386
433 r += !!(x & 0xaaaaaaaa) << 0;
434 r += !!(x & 0xcccccccc) << 1;
435 r += !!(x & 0xf0f0f0f0) << 2;
436 r += !!(x & 0xff00ff00) << 3;
437 r += !!(x & 0xffff0000) << 4;
438#else
439 if (x & 0xaaaaaaaa) r += 1;
440 if (x & 0xcccccccc) r += 2;
441 if (x & 0xf0f0f0f0) r += 4;
442 if (x & 0xff00ff00) r += 8;
443 if (x & 0xffff0000) r += 16;
444#endif
445
446 return r;
447 }
448
449 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
450 ecb_function_ ecb_const int
451 ecb_ctz64 (uint64_t x)
452 {
453 int shift = x & 0xffffffff ? 0 : 32;
454 return ecb_ctz32 (x >> shift) + shift;
455 }
456
457 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
458 ecb_function_ ecb_const int
459 ecb_popcount32 (uint32_t x)
460 {
461 x -= (x >> 1) & 0x55555555;
462 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
463 x = ((x >> 4) + x) & 0x0f0f0f0f;
464 x *= 0x01010101;
465
466 return x >> 24;
467 }
468
469 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
470 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
471 {
472 int r = 0;
473
474 if (x >> 16) { x >>= 16; r += 16; }
475 if (x >> 8) { x >>= 8; r += 8; }
476 if (x >> 4) { x >>= 4; r += 4; }
477 if (x >> 2) { x >>= 2; r += 2; }
478 if (x >> 1) { r += 1; }
479
480 return r;
481 }
482
483 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
484 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
485 {
486 int r = 0;
487
488 if (x >> 32) { x >>= 32; r += 32; }
489
490 return r + ecb_ld32 (x);
491 }
492#endif
493
494ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
495ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
496ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
497ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
498
499ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
500ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
501{
502 return ( (x * 0x0802U & 0x22110U)
503 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
504}
505
506ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
507ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
508{
509 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
510 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
511 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
512 x = ( x >> 8 ) | ( x << 8);
513
514 return x;
515}
516
517ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
518ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
519{
520 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
521 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
522 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
523 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
524 x = ( x >> 16 ) | ( x << 16);
525
526 return x;
527}
528
529/* popcount64 is only available on 64 bit cpus as gcc builtin */
530/* so for this version we are lazy */
531ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
532ecb_function_ ecb_const int
533ecb_popcount64 (uint64_t x)
534{
535 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
536}
537
538ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
539ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
540ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
541ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
542ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
543ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
544ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
545ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
546
547ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
548ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
549ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
550ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
551ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
552ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
553ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
554ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
555
556#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
557 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
558 #define ecb_bswap16(x) __builtin_bswap16 (x)
559 #else
560 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
561 #endif
562 #define ecb_bswap32(x) __builtin_bswap32 (x)
563 #define ecb_bswap64(x) __builtin_bswap64 (x)
564#elif _MSC_VER
565 #include <stdlib.h>
566 #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
567 #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
568 #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
569#else
570 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
571 ecb_function_ ecb_const uint16_t
572 ecb_bswap16 (uint16_t x)
573 {
574 return ecb_rotl16 (x, 8);
575 }
576
577 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
578 ecb_function_ ecb_const uint32_t
579 ecb_bswap32 (uint32_t x)
580 {
581 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
582 }
583
584 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
585 ecb_function_ ecb_const uint64_t
586 ecb_bswap64 (uint64_t x)
587 {
588 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
589 }
590#endif
591
592#if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
82# define ecb_unreachable() __builtin_unreachable () 593 #define ecb_unreachable() __builtin_unreachable ()
83#else 594#else
84/* this seems to work fine, but gcc always emits a warning for it :/ */ 595 /* this seems to work fine, but gcc always emits a warning for it :/ */
85ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn)); 596 ecb_inline ecb_noreturn void ecb_unreachable (void);
86ECB_HEADER_INLINE void ecb_unreachable () { } 597 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
87#endif 598#endif
88
89/* put into ifs if you are very sure that the expression */
90/* is mostly true or mosty false. note that these return */
91/* booleans, not the expression. */
92#define ecb_unlikely(expr) ecb_expect (!!(expr), 0)
93#define ecb_likely(expr) ecb_expect (!!(expr), 1)
94 599
95/* try to tell the compiler that some condition is definitely true */ 600/* try to tell the compiler that some condition is definitely true */
96#define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) 601#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
97 602
98/* count trailing zero bits and count # of one bits */ 603ecb_inline ecb_const unsigned char ecb_byteorder_helper (void);
99#if ECB_GCC_VERSION(3,4) 604ecb_inline ecb_const unsigned char
100ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } 605ecb_byteorder_helper (void)
101ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); }
102#else
103ECB_HEADER_INLINE
104ecb_ctz32 (uint32_t x) ecb_const
105{ 606{
106 int r = 0; 607 /* the union code still generates code under pressure in gcc, */
107 608 /* but less than using pointers, and always seems to */
108 x &= -x; /* this isolates the lowest bit */ 609 /* successfully return a constant. */
109 610 /* the reason why we have this horrible preprocessor mess */
110 if (x & 0xaaaaaaaa) r += 1; 611 /* is to avoid it in all cases, at least on common architectures */
111 if (x & 0xcccccccc) r += 2; 612 /* or when using a recent enough gcc version (>= 4.6) */
112 if (x & 0xf0f0f0f0) r += 4; 613#if ((__i386 || __i386__) && !__VOS__) || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64
113 if (x & 0xff00ff00) r += 8; 614 return 0x44;
114 if (x & 0xffff0000) r += 16; 615#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
115 616 return 0x44;
617#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
618 return 0x11;
619#else
620 union
621 {
622 uint32_t i;
623 uint8_t c;
624 } u = { 0x11223344 };
116 return r; 625 return u.c;
626#endif
117} 627}
118 628
119ECB_HEADER_INLINE 629ecb_inline ecb_const ecb_bool ecb_big_endian (void);
120ecb_popcount32 (uint32_t x) ecb_const 630ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
631ecb_inline ecb_const ecb_bool ecb_little_endian (void);
632ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
633
634#if ECB_GCC_VERSION(3,0) || ECB_C99
635 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
636#else
637 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
638#endif
639
640#if ECB_CPP
641 template<typename T>
642 static inline T ecb_div_rd (T val, T div)
643 {
644 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
645 }
646 template<typename T>
647 static inline T ecb_div_ru (T val, T div)
648 {
649 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
650 }
651#else
652 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
653 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
654#endif
655
656#if ecb_cplusplus_does_not_suck
657 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
658 template<typename T, int N>
659 static inline int ecb_array_length (const T (&arr)[N])
660 {
661 return N;
662 }
663#else
664 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
665#endif
666
667ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint16_t x);
668ecb_function_ ecb_const uint32_t
669ecb_binary16_to_binary32 (uint16_t x)
121{ 670{
122 x -= (x >> 1) & 0x55555555; 671 unsigned int s = (x & 0x8000) << (31 - 15);
123 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 672 int e = (x >> 10) & 0x001f;
124 x = ((x >> 4) + x) & 0x0f0f0f0f; 673 unsigned int m = x & 0x03ff;
125 x *= 0x01010101;
126 674
127 return x >> 24; 675 if (ecb_expect_false (e == 31))
676 /* infinity or NaN */
677 e = 255 - (127 - 15);
678 else if (ecb_expect_false (!e))
679 {
680 if (ecb_expect_true (!m))
681 /* zero, handled by code below by forcing e to 0 */
682 e = 0 - (127 - 15);
683 else
684 {
685 /* subnormal, renormalise */
686 unsigned int s = 10 - ecb_ld32 (m);
687
688 m = (m << s) & 0x3ff; /* mask implicit bit */
689 e -= s - 1;
690 }
691 }
692
693 /* e and m now are normalised, or zero, (or inf or nan) */
694 e += 127 - 15;
695
696 return s | (e << 23) | (m << (23 - 10));
128} 697}
129#endif
130 698
131ECB_HEADER_INLINE unsigned char 699ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
132ecb_byteorder_helper () ecb_const 700ecb_function_ ecb_const uint16_t
701ecb_binary32_to_binary16 (uint32_t x)
133{ 702{
134 const uint32_t u = 0x11223344; 703 unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
135 return *(unsigned char *)&u; 704 unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
705 unsigned int m = x & 0x007fffff;
706
707 x &= 0x7fffffff;
708
709 /* if it's within range of binary16 normals, use fast path */
710 if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
711 {
712 /* mantissa round-to-even */
713 m += 0x00000fff + ((m >> (23 - 10)) & 1);
714
715 /* handle overflow */
716 if (ecb_expect_false (m >= 0x00800000))
717 {
718 m >>= 1;
719 e += 1;
720 }
721
722 return s | (e << 10) | (m >> (23 - 10));
723 }
724
725 /* handle large numbers and infinity */
726 if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
727 return s | 0x7c00;
728
729 /* handle zero and subnormals */
730 if (ecb_expect_true (x < 0x38800000))
731 {
732 /* zero */
733 if (ecb_expect_true (!x))
734 return s;
735
736 /* handle subnormals */
737
738 m |= 0x00800000; /* make implicit bit explicit */
739
740 /* very tricky - we need to round to the nearest e (+10) bit value */
741 {
742 unsigned int bits = 14 - e;
743 unsigned int half = (1 << (bits - 1)) - 1;
744 unsigned int even = (m >> bits) & 1;
745
746 /* if this overflows, we will end up with a normalised number */
747 m = (m + half + even) >> bits;
748 }
749
750 return s | m;
751 }
752
753 /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
754 m >>= 13;
755
756 return s | 0x7c00 | m | !m;
136} 757}
137 758
138ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; }; 759/*******************************************************************************/
139ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { return ecb_byteorder_helper () == 0x44; }; 760/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
140 761
141#if ecb_cplusplus_does_not_suck 762/* basically, everything uses "ieee pure-endian" floating point numbers */
142// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) 763/* the only noteworthy exception is ancient armle, which uses order 43218765 */
143template<typename T, int N> 764#if 0 \
144static inline int ecb_array_length (const T (&arr)[N]) 765 || __i386 || __i386__ \
145{ 766 || ECB_GCC_AMD64 \
146 return N; 767 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
147} 768 || defined __s390__ || defined __s390x__ \
769 || defined __mips__ \
770 || defined __alpha__ \
771 || defined __hppa__ \
772 || defined __ia64__ \
773 || defined __m68k__ \
774 || defined __m88k__ \
775 || defined __sh__ \
776 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
777 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
778 || defined __aarch64__
779 #define ECB_STDFP 1
780 #include <string.h> /* for memcpy */
781#else
782 #define ECB_STDFP 0
783#endif
784
785#ifndef ECB_NO_LIBM
786
787 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
788
789 /* only the oldest of old doesn't have this one. solaris. */
790 #ifdef INFINITY
791 #define ECB_INFINITY INFINITY
148#else 792 #else
149#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 793 #define ECB_INFINITY HUGE_VAL
150#endif 794 #endif
151 795
152ECB_INLINE uint32_t 796 #ifdef NAN
153ecb_rotr32 (uint32_t x, unsigned int count) 797 #define ECB_NAN NAN
154{
155 return (x << (32 - count)) | (x >> count);
156}
157
158ECB_INLINE uint32_t
159ecb_rotl32 (uint32_t x, unsigned int count)
160{
161 return (x >> (32 - count)) | (x << count);
162}
163
164#if ECB_GCC_VERSION(4,3)
165# define ecb_bswap32(x) __builtin_bswap32 (x)
166#else 798 #else
167ECB_GCC_VERSION uint32_t 799 #define ECB_NAN ECB_INFINITY
168ecb_bswap32 (uint32_t x)
169{
170 return (x >> 24)
171 | ((x >> 8) & 0x0000ff00)
172 | ((x << 8) & 0x00ff0000)
173 | (x << 24);
174}
175#endif 800 #endif
176 801
802 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
803 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
804 #define ecb_frexpf(x,e) frexpf ((x), (e))
805 #else
806 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
807 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
177#endif 808 #endif
178 809
810 /* convert a float to ieee single/binary32 */
811 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
812 ecb_function_ ecb_const uint32_t
813 ecb_float_to_binary32 (float x)
814 {
815 uint32_t r;
816
817 #if ECB_STDFP
818 memcpy (&r, &x, 4);
819 #else
820 /* slow emulation, works for anything but -0 */
821 uint32_t m;
822 int e;
823
824 if (x == 0e0f ) return 0x00000000U;
825 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
826 if (x < -3.40282346638528860e+38f) return 0xff800000U;
827 if (x != x ) return 0x7fbfffffU;
828
829 m = ecb_frexpf (x, &e) * 0x1000000U;
830
831 r = m & 0x80000000U;
832
833 if (r)
834 m = -m;
835
836 if (e <= -126)
837 {
838 m &= 0xffffffU;
839 m >>= (-125 - e);
840 e = -126;
841 }
842
843 r |= (e + 126) << 23;
844 r |= m & 0x7fffffU;
845 #endif
846
847 return r;
848 }
849
850 /* converts an ieee single/binary32 to a float */
851 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
852 ecb_function_ ecb_const float
853 ecb_binary32_to_float (uint32_t x)
854 {
855 float r;
856
857 #if ECB_STDFP
858 memcpy (&r, &x, 4);
859 #else
860 /* emulation, only works for normals and subnormals and +0 */
861 int neg = x >> 31;
862 int e = (x >> 23) & 0xffU;
863
864 x &= 0x7fffffU;
865
866 if (e)
867 x |= 0x800000U;
868 else
869 e = 1;
870
871 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
872 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
873
874 r = neg ? -r : r;
875 #endif
876
877 return r;
878 }
879
880 /* convert a double to ieee double/binary64 */
881 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
882 ecb_function_ ecb_const uint64_t
883 ecb_double_to_binary64 (double x)
884 {
885 uint64_t r;
886
887 #if ECB_STDFP
888 memcpy (&r, &x, 8);
889 #else
890 /* slow emulation, works for anything but -0 */
891 uint64_t m;
892 int e;
893
894 if (x == 0e0 ) return 0x0000000000000000U;
895 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
896 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
897 if (x != x ) return 0X7ff7ffffffffffffU;
898
899 m = frexp (x, &e) * 0x20000000000000U;
900
901 r = m & 0x8000000000000000;;
902
903 if (r)
904 m = -m;
905
906 if (e <= -1022)
907 {
908 m &= 0x1fffffffffffffU;
909 m >>= (-1021 - e);
910 e = -1022;
911 }
912
913 r |= ((uint64_t)(e + 1022)) << 52;
914 r |= m & 0xfffffffffffffU;
915 #endif
916
917 return r;
918 }
919
920 /* converts an ieee double/binary64 to a double */
921 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
922 ecb_function_ ecb_const double
923 ecb_binary64_to_double (uint64_t x)
924 {
925 double r;
926
927 #if ECB_STDFP
928 memcpy (&r, &x, 8);
929 #else
930 /* emulation, only works for normals and subnormals and +0 */
931 int neg = x >> 63;
932 int e = (x >> 52) & 0x7ffU;
933
934 x &= 0xfffffffffffffU;
935
936 if (e)
937 x |= 0x10000000000000U;
938 else
939 e = 1;
940
941 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
942 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
943
944 r = neg ? -r : r;
945 #endif
946
947 return r;
948 }
949
950 /* convert a float to ieee half/binary16 */
951 ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
952 ecb_function_ ecb_const uint16_t
953 ecb_float_to_binary16 (float x)
954 {
955 return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
956 }
957
958 /* convert an ieee half/binary16 to float */
959 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
960 ecb_function_ ecb_const float
961 ecb_binary16_to_float (uint16_t x)
962 {
963 return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
964 }
965
966#endif
967
968#endif
969

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