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Comparing libecb/ecb.h (file contents):
Revision 1.103 by root, Thu Jun 28 18:04:44 2012 UTC vs.
Revision 1.137 by root, Tue Oct 14 14:01:07 2014 UTC

1/* 1/*
2 * libecb - http://software.schmorp.de/pkg/libecb 2 * libecb - http://software.schmorp.de/pkg/libecb
3 * 3 *
4 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de> 4 * Copyright (©) 2009-2014 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
33/* 16 bits major, 16 bits minor */ 44/* 16 bits major, 16 bits minor */
34#define ECB_VERSION 0x00010001 45#define ECB_VERSION 0x00010003
35 46
36#ifdef _WIN32 47#ifdef _WIN32
37 typedef signed char int8_t; 48 typedef signed char int8_t;
38 typedef unsigned char uint8_t; 49 typedef unsigned char uint8_t;
39 typedef signed short int16_t; 50 typedef signed short int16_t;
… …
63 #else 74 #else
64 #define ECB_PTRSIZE 4 75 #define ECB_PTRSIZE 4
65 #endif 76 #endif
66#endif 77#endif
67 78
79/* work around x32 idiocy by defining proper macros */
80#if __amd64 || __x86_64 || _M_AMD64 || _M_X64
81 #if _ILP32
82 #define ECB_AMD64_X32 1
83 #else
84 #define ECB_AMD64 1
85 #endif
86#endif
87
68/* many compilers define _GNUC_ to some versions but then only implement 88/* many compilers define _GNUC_ to some versions but then only implement
69 * what their idiot authors think are the "more important" extensions, 89 * what their idiot authors think are the "more important" extensions,
70 * causing enormous grief in return for some better fake benchmark numbers. 90 * causing enormous grief in return for some better fake benchmark numbers.
71 * or so. 91 * or so.
72 * we try to detect these and simply assume they are not gcc - if they have 92 * we try to detect these and simply assume they are not gcc - if they have
73 * an issue with that they should have done it right in the first place. 93 * an issue with that they should have done it right in the first place.
74 */ 94 */
75#ifndef ECB_GCC_VERSION
76 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__ 95#if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
77 #define ECB_GCC_VERSION(major,minor) 0 96 #define ECB_GCC_VERSION(major,minor) 0
78 #else 97#else
79 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 98 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
80 #endif 99#endif
81#endif
82 100
83#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
84#define ECB_C99 (__STDC_VERSION__ >= 199901L)
85#define ECB_C11 (__STDC_VERSION__ >= 201112L)
86#define ECB_CPP (__cplusplus+0) 101#define ECB_CPP (__cplusplus+0)
87#define ECB_CPP11 (__cplusplus >= 201103L) 102#define ECB_CPP11 (__cplusplus >= 201103L)
103
104#if ECB_CPP
105 #define ECB_C 0
106 #define ECB_STDC_VERSION 0
107#else
108 #define ECB_C 1
109 #define ECB_STDC_VERSION __STDC_VERSION__
110#endif
111
112#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
113#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
88 114
89#if ECB_CPP 115#if ECB_CPP
90 #define ECB_EXTERN_C extern "C" 116 #define ECB_EXTERN_C extern "C"
91 #define ECB_EXTERN_C_BEG ECB_EXTERN_C { 117 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
92 #define ECB_EXTERN_C_END } 118 #define ECB_EXTERN_C_END }
… …
125 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ 151 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
126 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") 152 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
127 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ 153 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
128 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ 154 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
129 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") 155 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
156 #elif __aarch64__
157 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
130 #elif __sparc || __sparc__ 158 #elif (__sparc || __sparc__) && !__sparcv8
131 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") 159 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
132 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") 160 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
133 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") 161 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
134 #elif defined __s390__ || defined __s390x__ 162 #elif defined __s390__ || defined __s390x__
135 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") 163 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
136 #elif defined __mips__ 164 #elif defined __mips__
165 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
166 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
137 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 167 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
138 #elif defined __alpha__ 168 #elif defined __alpha__
139 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") 169 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
140 #elif defined __hppa__ 170 #elif defined __hppa__
141 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") 171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
142 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") 172 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
143 #elif defined __ia64__ 173 #elif defined __ia64__
144 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory") 174 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
175 #elif defined __m68k__
176 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
177 #elif defined __m88k__
178 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
179 #elif defined __sh__
180 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
145 #endif 181 #endif
146 #endif 182 #endif
147#endif 183#endif
148 184
149#ifndef ECB_MEMORY_FENCE 185#ifndef ECB_MEMORY_FENCE
150 #if ECB_GCC_VERSION(4,7) 186 #if ECB_GCC_VERSION(4,7)
151 /* see comment below (stdatomic.h) about the C11 memory model. */ 187 /* see comment below (stdatomic.h) about the C11 memory model. */
152 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) 188 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
189 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
190 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
191
192 /* The __has_feature syntax from clang is so misdesigned that we cannot use it
193 * without risking compile time errors with other compilers. We *could*
194 * define our own ecb_clang_has_feature, but I just can't be bothered to work
195 * around this shit time and again.
153 /*#elif defined __clang && __has_feature (cxx_atomic)*/ 196 * #elif defined __clang && __has_feature (cxx_atomic)
154 /* see comment below (stdatomic.h) about the C11 memory model. */ 197 * // see comment below (stdatomic.h) about the C11 memory model.
155 /*#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)*/ 198 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
199 * #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
200 * #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
201 */
202
156 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 203 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
157 #define ECB_MEMORY_FENCE __sync_synchronize () 204 #define ECB_MEMORY_FENCE __sync_synchronize ()
205 #elif _MSC_VER >= 1500 /* VC++ 2008 */
206 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
207 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
208 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
209 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
210 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
158 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 211 #elif _MSC_VER >= 1400 /* VC++ 2005 */
159 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 212 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
160 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 213 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
161 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ 214 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
162 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () 215 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
… …
182 /* any fence other than seq_cst, which isn't very efficient for us. */ 235 /* any fence other than seq_cst, which isn't very efficient for us. */
183 /* Why that is, we don't know - either the C11 memory model is quite useless */ 236 /* Why that is, we don't know - either the C11 memory model is quite useless */
184 /* for most usages, or gcc and clang have a bug */ 237 /* for most usages, or gcc and clang have a bug */
185 /* I *currently* lean towards the latter, and inefficiently implement */ 238 /* I *currently* lean towards the latter, and inefficiently implement */
186 /* all three of ecb's fences as a seq_cst fence */ 239 /* all three of ecb's fences as a seq_cst fence */
240 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
241 /* for all __atomic_thread_fence's except seq_cst */
187 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) 242 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
188 #endif 243 #endif
189#endif 244#endif
190 245
191#ifndef ECB_MEMORY_FENCE 246#ifndef ECB_MEMORY_FENCE
… …
248 #define ecb_is_constant(expr) __builtin_constant_p (expr) 303 #define ecb_is_constant(expr) __builtin_constant_p (expr)
249 #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 304 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
250 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 305 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
251#else 306#else
252 #define ecb_attribute(attrlist) 307 #define ecb_attribute(attrlist)
308
309 /* possible C11 impl for integral types
310 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
311 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
312
253 #define ecb_is_constant(expr) 0 313 #define ecb_is_constant(expr) 0
254 #define ecb_expect(expr,value) (expr) 314 #define ecb_expect(expr,value) (expr)
255 #define ecb_prefetch(addr,rw,locality) 315 #define ecb_prefetch(addr,rw,locality)
256#endif 316#endif
257 317
… …
260 #define ecb_decltype(x) __decltype(x) 320 #define ecb_decltype(x) __decltype(x)
261#elif ECB_GCC_VERSION(3,0) 321#elif ECB_GCC_VERSION(3,0)
262 #define ecb_decltype(x) __typeof(x) 322 #define ecb_decltype(x) __typeof(x)
263#endif 323#endif
264 324
325#if _MSC_VER >= 1300
326 #define ecb_deprecated __declspec(deprecated)
327#else
328 #define ecb_deprecated ecb_attribute ((__deprecated__))
329#endif
330
265#define ecb_noinline ecb_attribute ((__noinline__)) 331#define ecb_noinline ecb_attribute ((__noinline__))
266#define ecb_unused ecb_attribute ((__unused__)) 332#define ecb_unused ecb_attribute ((__unused__))
267#define ecb_const ecb_attribute ((__const__)) 333#define ecb_const ecb_attribute ((__const__))
268#define ecb_pure ecb_attribute ((__pure__)) 334#define ecb_pure ecb_attribute ((__pure__))
269 335
336/* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx __declspec(noreturn) */
270#if ECB_C11 337#if ECB_C11
271 #define ecb_noreturn _Noreturn 338 #define ecb_noreturn _Noreturn
272#else 339#else
273 #define ecb_noreturn ecb_attribute ((__noreturn__)) 340 #define ecb_noreturn ecb_attribute ((__noreturn__))
274#endif 341#endif
… …
475ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; 542ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
476ecb_inline unsigned char 543ecb_inline unsigned char
477ecb_byteorder_helper (void) 544ecb_byteorder_helper (void)
478{ 545{
479 /* the union code still generates code under pressure in gcc, */ 546 /* the union code still generates code under pressure in gcc, */
480 /* but less than using pointers, and always seem to */ 547 /* but less than using pointers, and always seems to */
481 /* successfully return a constant. */ 548 /* successfully return a constant. */
482 /* the reason why we have this horrible preprocessor mess */ 549 /* the reason why we have this horrible preprocessor mess */
483 /* is to avoid it in all cases, at least on common architectures */ 550 /* is to avoid it in all cases, at least on common architectures */
484 /* and yes, gcc defines __BYTE_ORDER__, g++ does not */ 551 /* or when using a recent enough gcc version (>= 4.6) */
485#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64 552#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
486 return 0x44; 553 return 0x44;
487#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 554#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
488 return 0x44; 555 return 0x44;
489#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 556#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
490 retrurn 0x11; 557 return 0x11;
491#else 558#else
492 union 559 union
493 { 560 {
494 uint32_t i; 561 uint32_t i;
495 uint8_t c; 562 uint8_t c;
… …
534 } 601 }
535#else 602#else
536 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 603 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
537#endif 604#endif
538 605
539#if __STDC_IEC_559__
540 // we assume this is defined for most C and many C++ compilers
541 ecb_inline ecb_bool ecb_float_ieee (void) ecb_const;
542 ecb_inline ecb_bool ecb_float_ieee (void) { return 1; }
543 ecb_inline ecb_bool ecb_double_ieee (void) ecb_const;
544 ecb_inline ecb_bool ecb_double_ieee (void) { return 1; }
545#elif ECB_CPP
546 #include <limits>
547 ecb_inline ecb_bool ecb_float_ieee (void) ecb_const;
548 ecb_inline ecb_bool ecb_float_ieee (void) { return std::numeric_limits<float >::is_iec559; }
549 ecb_inline ecb_bool ecb_double_ieee (void) ecb_const;
550 ecb_inline ecb_bool ecb_double_ieee (void) { return std::numeric_limits<double>::is_iec559; }
551#else
552 ecb_inline ecb_bool ecb_float_ieee (void) ecb_const;
553 ecb_inline ecb_bool ecb_float_ieee (void) { return 0; }
554 ecb_inline ecb_bool ecb_double_ieee (void) ecb_const;
555 ecb_inline ecb_bool ecb_double_ieee (void) { return 0; }
556#endif
557
558/*******************************************************************************/ 606/*******************************************************************************/
559/* floating point stuff, can be disabled by defining ECB_NO_FP */ 607/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
560 608
561#ifndef ECB_NO_FP
562
563 /* basically, everything uses "ieee pure-endian" floating point numbers */ 609/* basically, everything uses "ieee pure-endian" floating point numbers */
564 /* the only noteworthy exception is ancient armle, which uses order 43218765 */ 610/* the only noteworthy exception is ancient armle, which uses order 43218765 */
565 #if 0 \ 611#if 0 \
566 || __i386 || __i386__ \ 612 || __i386 || __i386__ \
567 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \ 613 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
568 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \ 614 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
569 || defined __arm__ && defined __ARM_EABI__ \
570 || defined __s390__ || defined __s390x__ \ 615 || defined __s390__ || defined __s390x__ \
571 || defined __mips__ \ 616 || defined __mips__ \
572 || defined __alpha__ \ 617 || defined __alpha__ \
573 || defined __hppa__ \ 618 || defined __hppa__ \
574 || defined __ia64__ \ 619 || defined __ia64__ \
620 || defined __m68k__ \
621 || defined __m88k__ \
622 || defined __sh__ \
575 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 623 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \
624 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
625 || defined __aarch64__
576 #define ECB_STDFP 1 626 #define ECB_STDFP 1
627 #include <string.h> /* for memcpy */
628#else
629 #define ECB_STDFP 0
630#endif
631
632#ifndef ECB_NO_LIBM
633
634 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
635
636 /* only the oldest of old doesn't have this one. solaris. */
637 #ifdef INFINITY
638 #define ECB_INFINITY INFINITY
577 #else 639 #else
578 #define ECB_STDFP 0 640 #define ECB_INFINITY HUGE_VAL
579 #endif 641 #endif
580 642
643 #ifdef NAN
644 #define ECB_NAN NAN
645 #else
646 #define ECB_NAN ECB_INFINITY
647 #endif
648
649 /* converts an ieee half/binary16 to a float */
650 ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
651 ecb_function_ float
652 ecb_binary16_to_float (uint16_t x)
653 {
654 int e = (x >> 10) & 0x1f;
655 int m = x & 0x3ff;
656 float r;
657
658 if (!e ) r = ldexpf (m , -24);
659 else if (e != 31) r = ldexpf (m + 0x400, e - 25);
660 else if (m ) r = ECB_NAN;
661 else r = ECB_INFINITY;
662
663 return x & 0x8000 ? -r : r;
664 }
665
581 // convert a float to ieee single/binary32 666 /* convert a float to ieee single/binary32 */
582 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const; 667 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
583 ecb_function_ uint32_t 668 ecb_function_ uint32_t
584 ecb_float_to_binary32 (float x) 669 ecb_float_to_binary32 (float x)
585 { 670 {
586 uint32_t r; 671 uint32_t r;
587 672
588 #if ECB_STDFP 673 #if ECB_STDFP
589 ((char *)&r) [0] = ((char *)&x)[0]; 674 memcpy (&r, &x, 4);
590 ((char *)&r) [1] = ((char *)&x)[1];
591 ((char *)&r) [2] = ((char *)&x)[2];
592 ((char *)&r) [3] = ((char *)&x)[3];
593 #else 675 #else
594 /* slow emulation, works for anything but nan's and -0 */ 676 /* slow emulation, works for anything but -0 */
595 ECB_EXTERN_C float frexpf (float v, int *e);
596 uint32_t m; 677 uint32_t m;
597 int e; 678 int e;
598 679
599 if (x == 0e0f ) return 0; 680 if (x == 0e0f ) return 0x00000000U;
600 if (x > +3.40282346638528860e+38f) return 0x7f800000U; 681 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
601 if (x < -3.40282346638528860e+38f) return 0xff800000U; 682 if (x < -3.40282346638528860e+38f) return 0xff800000U;
683 if (x != x ) return 0x7fbfffffU;
602 684
603 m = frexpf (x, &e) * 0x1000000U; 685 m = frexpf (x, &e) * 0x1000000U;
604 686
605 r = m & 0x80000000U; 687 r = m & 0x80000000U;
606 688
607 if (r) 689 if (r)
608 m = -m; 690 m = -m;
609 691
610 if (e < -125) 692 if (e <= -126)
611 { 693 {
612 m &= 0xffffffU; 694 m &= 0xffffffU;
613 m >>= (-125 - e); 695 m >>= (-125 - e);
614 e = -126; 696 e = -126;
615 } 697 }
… …
619 #endif 701 #endif
620 702
621 return r; 703 return r;
622 } 704 }
623 705
624 // converts a ieee single/binary32 to a float 706 /* converts an ieee single/binary32 to a float */
625 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const; 707 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
626 ecb_function_ float 708 ecb_function_ float
627 ecb_binary32_to_float (uint32_t x) 709 ecb_binary32_to_float (uint32_t x)
628 { 710 {
629 float r; 711 float r;
630 712
631 #if ECB_STDFP 713 #if ECB_STDFP
632 ((char *)&r) [0] = ((char *)&x)[0]; 714 memcpy (&r, &x, 4);
633 ((char *)&r) [1] = ((char *)&x)[1];
634 ((char *)&r) [2] = ((char *)&x)[2];
635 ((char *)&r) [3] = ((char *)&x)[3];
636 #else 715 #else
637 /* emulation, only works for normals and subnormals and +0 */ 716 /* emulation, only works for normals and subnormals and +0 */
638 ECB_EXTERN_C float ldexpf (float x, int e);
639
640 int neg = x >> 31; 717 int neg = x >> 31;
641 int e = (x >> 23) & 0xffU; 718 int e = (x >> 23) & 0xffU;
642 719
643 x &= 0x7fffffU; 720 x &= 0x7fffffU;
644 721
645 if (e) 722 if (e)
646 x |= 0x800000U; 723 x |= 0x800000U;
724 else
725 e = 1;
647 726
648 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ 727 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
649 r = ldexpf (x * (1.f / 0x1000000U), e - 126); 728 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
650 729
651 r = neg ? -r : r; 730 r = neg ? -r : r;
652 #endif 731 #endif
653 732
654 return r; 733 return r;
655 } 734 }
656 735
736 /* convert a double to ieee double/binary64 */
657 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const; 737 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
658 ecb_function_ uint64_t 738 ecb_function_ uint64_t
659 ecb_double_to_binary64 (double x) 739 ecb_double_to_binary64 (double x)
660 { 740 {
661 } 741 uint64_t r;
662 742
743 #if ECB_STDFP
744 memcpy (&r, &x, 8);
745 #else
746 /* slow emulation, works for anything but -0 */
747 uint64_t m;
748 int e;
749
750 if (x == 0e0 ) return 0x0000000000000000U;
751 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
752 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
753 if (x != x ) return 0X7ff7ffffffffffffU;
754
755 m = frexp (x, &e) * 0x20000000000000U;
756
757 r = m & 0x8000000000000000;;
758
759 if (r)
760 m = -m;
761
762 if (e <= -1022)
763 {
764 m &= 0x1fffffffffffffU;
765 m >>= (-1021 - e);
766 e = -1022;
767 }
768
769 r |= ((uint64_t)(e + 1022)) << 52;
770 r |= m & 0xfffffffffffffU;
663#endif 771 #endif
664 772
773 return r;
774 }
775
776 /* converts an ieee double/binary64 to a double */
777 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
778 ecb_function_ double
779 ecb_binary64_to_double (uint64_t x)
780 {
781 double r;
782
783 #if ECB_STDFP
784 memcpy (&r, &x, 8);
785 #else
786 /* emulation, only works for normals and subnormals and +0 */
787 int neg = x >> 63;
788 int e = (x >> 52) & 0x7ffU;
789
790 x &= 0xfffffffffffffU;
791
792 if (e)
793 x |= 0x10000000000000U;
794 else
795 e = 1;
796
797 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
798 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
799
800 r = neg ? -r : r;
665#endif 801 #endif
666 802
803 return r;
804 }
805
806#endif
807
808#endif
809

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