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Comparing libeio/ecb.h (file contents):
Revision 1.14 by root, Sun Jun 17 17:07:25 2012 UTC vs.
Revision 1.22 by root, Sun Jul 27 22:10:53 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;
… …
54 #else 65 #else
55 #define ECB_PTRSIZE 4 66 #define ECB_PTRSIZE 4
56 typedef uint32_t uintptr_t; 67 typedef uint32_t uintptr_t;
57 typedef int32_t intptr_t; 68 typedef int32_t intptr_t;
58 #endif 69 #endif
59 typedef intptr_t ptrdiff_t;
60#else 70#else
61 #include <inttypes.h> 71 #include <inttypes.h>
62 #if UINTMAX_MAX > 0xffffffffU 72 #if UINTMAX_MAX > 0xffffffffU
63 #define ECB_PTRSIZE 8 73 #define ECB_PTRSIZE 8
64 #else 74 #else
65 #define ECB_PTRSIZE 4 75 #define ECB_PTRSIZE 4
76 #endif
77#endif
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
66 #endif 85 #endif
67#endif 86#endif
68 87
69/* many compilers define _GNUC_ to some versions but then only implement 88/* many compilers define _GNUC_ to some versions but then only implement
70 * what their idiot authors think are the "more important" extensions, 89 * what their idiot authors think are the "more important" extensions,
… …
79 #else 98 #else
80 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 99 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
81 #endif 100 #endif
82#endif 101#endif
83 102
84#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
85#define ECB_C99 (__STDC_VERSION__ >= 199901L)
86#define ECB_C11 (__STDC_VERSION__ >= 201112L)
87#define ECB_CPP (__cplusplus+0) 103#define ECB_CPP (__cplusplus+0)
88#define ECB_CPP11 (__cplusplus >= 201103L) 104#define ECB_CPP11 (__cplusplus >= 201103L)
105
106#if ECB_CPP
107 #define ECB_C 0
108 #define ECB_STDC_VERSION 0
109#else
110 #define ECB_C 1
111 #define ECB_STDC_VERSION __STDC_VERSION__
112#endif
113
114#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
115#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
116
117#if ECB_CPP
118 #define ECB_EXTERN_C extern "C"
119 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
120 #define ECB_EXTERN_C_END }
121#else
122 #define ECB_EXTERN_C extern
123 #define ECB_EXTERN_C_BEG
124 #define ECB_EXTERN_C_END
125#endif
89 126
90/*****************************************************************************/ 127/*****************************************************************************/
91 128
92/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ 129/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
93/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ 130/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
… …
116 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ 153 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
117 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") 154 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
118 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ 155 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
119 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ 156 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
120 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") 157 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
158 #elif __aarch64__
159 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
121 #elif __sparc || __sparc__ 160 #elif (__sparc || __sparc__) && !__sparcv8
122 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") 161 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
123 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") 162 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
124 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") 163 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
125 #elif defined __s390__ || defined __s390x__ 164 #elif defined __s390__ || defined __s390x__
126 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") 165 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
127 #elif defined __mips__ 166 #elif defined __mips__
167 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
168 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
128 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 169 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
129 #elif defined __alpha__ 170 #elif defined __alpha__
130 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") 171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
131 #elif defined __hppa__ 172 #elif defined __hppa__
132 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") 173 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
133 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") 174 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
134 #elif defined __ia64__ 175 #elif defined __ia64__
135 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory") 176 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
177 #elif defined __m68k__
178 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
179 #elif defined __m88k__
180 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
181 #elif defined __sh__
182 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
136 #endif 183 #endif
137 #endif 184 #endif
138#endif 185#endif
139 186
140#ifndef ECB_MEMORY_FENCE 187#ifndef ECB_MEMORY_FENCE
141 #if ECB_GCC_VERSION(4,7) 188 #if ECB_GCC_VERSION(4,7)
142 /* see comment below (stdatomic.h) about the C11 memory model. */ 189 /* see comment below (stdatomic.h) about the C11 memory model. */
143 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) 190 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
191 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
192 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
193
194 /* The __has_feature syntax from clang is so misdesigned that we cannot use it
195 * without risking compile time errors with other compilers. We *could*
196 * define our own ecb_clang_has_feature, but I just can't be bothered to work
197 * around this shit time and again.
144 #elif defined __clang && __has_feature (cxx_atomic) 198 * #elif defined __clang && __has_feature (cxx_atomic)
145 /* see comment below (stdatomic.h) about the C11 memory model. */ 199 * // see comment below (stdatomic.h) about the C11 memory model.
146 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) 200 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
201 * #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
202 * #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
203 */
204
147 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 205 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
148 #define ECB_MEMORY_FENCE __sync_synchronize () 206 #define ECB_MEMORY_FENCE __sync_synchronize ()
207 #elif _MSC_VER >= 1500 /* VC++ 2008 */
208 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
209 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
210 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
211 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
212 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
149 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 213 #elif _MSC_VER >= 1400 /* VC++ 2005 */
150 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 214 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
151 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 215 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
152 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ 216 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
153 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () 217 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
… …
173 /* any fence other than seq_cst, which isn't very efficient for us. */ 237 /* any fence other than seq_cst, which isn't very efficient for us. */
174 /* Why that is, we don't know - either the C11 memory model is quite useless */ 238 /* Why that is, we don't know - either the C11 memory model is quite useless */
175 /* for most usages, or gcc and clang have a bug */ 239 /* for most usages, or gcc and clang have a bug */
176 /* I *currently* lean towards the latter, and inefficiently implement */ 240 /* I *currently* lean towards the latter, and inefficiently implement */
177 /* all three of ecb's fences as a seq_cst fence */ 241 /* all three of ecb's fences as a seq_cst fence */
242 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
243 /* for all __atomic_thread_fence's except seq_cst */
178 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) 244 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
179 #endif 245 #endif
180#endif 246#endif
181 247
182#ifndef ECB_MEMORY_FENCE 248#ifndef ECB_MEMORY_FENCE
… …
239 #define ecb_is_constant(expr) __builtin_constant_p (expr) 305 #define ecb_is_constant(expr) __builtin_constant_p (expr)
240 #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 306 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
241 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 307 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
242#else 308#else
243 #define ecb_attribute(attrlist) 309 #define ecb_attribute(attrlist)
310
311 /* possible C11 impl for integral types
312 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
313 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
314
244 #define ecb_is_constant(expr) 0 315 #define ecb_is_constant(expr) 0
245 #define ecb_expect(expr,value) (expr) 316 #define ecb_expect(expr,value) (expr)
246 #define ecb_prefetch(addr,rw,locality) 317 #define ecb_prefetch(addr,rw,locality)
247#endif 318#endif
248 319
… …
251 #define ecb_decltype(x) __decltype(x) 322 #define ecb_decltype(x) __decltype(x)
252#elif ECB_GCC_VERSION(3,0) 323#elif ECB_GCC_VERSION(3,0)
253 #define ecb_decltype(x) __typeof(x) 324 #define ecb_decltype(x) __typeof(x)
254#endif 325#endif
255 326
327#if _MSC_VER >= 1300
328 #define ecb_deprecated __declspec(deprecated)
329#else
330 #define ecb_deprecated ecb_attribute ((__deprecated__))
331#endif
332
256#define ecb_noinline ecb_attribute ((__noinline__)) 333#define ecb_noinline ecb_attribute ((__noinline__))
257#define ecb_unused ecb_attribute ((__unused__)) 334#define ecb_unused ecb_attribute ((__unused__))
258#define ecb_const ecb_attribute ((__const__)) 335#define ecb_const ecb_attribute ((__const__))
259#define ecb_pure ecb_attribute ((__pure__)) 336#define ecb_pure ecb_attribute ((__pure__))
260 337
338/* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx __declspec(noreturn) */
261#if ECB_C11 339#if ECB_C11
262 #define ecb_noreturn _Noreturn 340 #define ecb_noreturn _Noreturn
263#else 341#else
264 #define ecb_noreturn ecb_attribute ((__noreturn__)) 342 #define ecb_noreturn ecb_attribute ((__noreturn__))
265#endif 343#endif
… …
466ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; 544ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
467ecb_inline unsigned char 545ecb_inline unsigned char
468ecb_byteorder_helper (void) 546ecb_byteorder_helper (void)
469{ 547{
470 /* the union code still generates code under pressure in gcc, */ 548 /* the union code still generates code under pressure in gcc, */
471 /* but less than using pointers, and always seem to */ 549 /* but less than using pointers, and always seems to */
472 /* successfully return a constant. */ 550 /* successfully return a constant. */
473 /* the reason why we have this horrible preprocessor mess */ 551 /* the reason why we have this horrible preprocessor mess */
474 /* is to avoid it in all cases, at least on common architectures */ 552 /* is to avoid it in all cases, at least on common architectures */
475 /* and yes, gcc defines __BYTE_ORDER__, g++ does not */ 553 /* or when using a recent enough gcc version (>= 4.6) */
476#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64 554#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
477 return 0x44; 555 return 0x44;
478#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 556#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
479 return 0x44; 557 return 0x44;
480#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 558#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
481 retrurn 0x11; 559 return 0x11;
482#else 560#else
483 union 561 union
484 { 562 {
485 uint32_t i; 563 uint32_t i;
486 uint8_t c; 564 uint8_t c;
… …
525 } 603 }
526#else 604#else
527 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 605 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
528#endif 606#endif
529 607
608/*******************************************************************************/
609/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
610
611/* basically, everything uses "ieee pure-endian" floating point numbers */
612/* the only noteworthy exception is ancient armle, which uses order 43218765 */
613#if 0 \
614 || __i386 || __i386__ \
615 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
616 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
617 || defined __s390__ || defined __s390x__ \
618 || defined __mips__ \
619 || defined __alpha__ \
620 || defined __hppa__ \
621 || defined __ia64__ \
622 || defined __m68k__ \
623 || defined __m88k__ \
624 || defined __sh__ \
625 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \
626 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
627 || defined __aarch64__
628 #define ECB_STDFP 1
629 #include <string.h> /* for memcpy */
630#else
631 #define ECB_STDFP 0
632#endif
633
634#ifndef ECB_NO_LIBM
635
636 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
637
638 /* only the oldest of old doesn't have this one. solaris. */
639 #ifdef INFINITY
640 #define ECB_INFINITY INFINITY
641 #else
642 #define ECB_INFINITY HUGE_VAL
530#endif 643 #endif
531 644
645 #ifdef NAN
646 #define ECB_NAN NAN
647 #else
648 #define ECB_NAN ECB_INFINITY
649 #endif
650
651 /* converts an ieee half/binary16 to a float */
652 ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
653 ecb_function_ float
654 ecb_binary16_to_float (uint16_t x)
655 {
656 int e = (x >> 10) & 0x1f;
657 int m = x & 0x3ff;
658 float r;
659
660 if (!e ) r = ldexpf (m , -24);
661 else if (e != 31) r = ldexpf (m + 0x400, e - 25);
662 else if (m ) r = ECB_NAN;
663 else r = ECB_INFINITY;
664
665 return x & 0x8000 ? -r : r;
666 }
667
668 /* convert a float to ieee single/binary32 */
669 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
670 ecb_function_ uint32_t
671 ecb_float_to_binary32 (float x)
672 {
673 uint32_t r;
674
675 #if ECB_STDFP
676 memcpy (&r, &x, 4);
677 #else
678 /* slow emulation, works for anything but -0 */
679 uint32_t m;
680 int e;
681
682 if (x == 0e0f ) return 0x00000000U;
683 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
684 if (x < -3.40282346638528860e+38f) return 0xff800000U;
685 if (x != x ) return 0x7fbfffffU;
686
687 m = frexpf (x, &e) * 0x1000000U;
688
689 r = m & 0x80000000U;
690
691 if (r)
692 m = -m;
693
694 if (e <= -126)
695 {
696 m &= 0xffffffU;
697 m >>= (-125 - e);
698 e = -126;
699 }
700
701 r |= (e + 126) << 23;
702 r |= m & 0x7fffffU;
703 #endif
704
705 return r;
706 }
707
708 /* converts an ieee single/binary32 to a float */
709 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
710 ecb_function_ float
711 ecb_binary32_to_float (uint32_t x)
712 {
713 float r;
714
715 #if ECB_STDFP
716 memcpy (&r, &x, 4);
717 #else
718 /* emulation, only works for normals and subnormals and +0 */
719 int neg = x >> 31;
720 int e = (x >> 23) & 0xffU;
721
722 x &= 0x7fffffU;
723
724 if (e)
725 x |= 0x800000U;
726 else
727 e = 1;
728
729 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
730 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
731
732 r = neg ? -r : r;
733 #endif
734
735 return r;
736 }
737
738 /* convert a double to ieee double/binary64 */
739 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
740 ecb_function_ uint64_t
741 ecb_double_to_binary64 (double x)
742 {
743 uint64_t r;
744
745 #if ECB_STDFP
746 memcpy (&r, &x, 8);
747 #else
748 /* slow emulation, works for anything but -0 */
749 uint64_t m;
750 int e;
751
752 if (x == 0e0 ) return 0x0000000000000000U;
753 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
754 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
755 if (x != x ) return 0X7ff7ffffffffffffU;
756
757 m = frexp (x, &e) * 0x20000000000000U;
758
759 r = m & 0x8000000000000000;;
760
761 if (r)
762 m = -m;
763
764 if (e <= -1022)
765 {
766 m &= 0x1fffffffffffffU;
767 m >>= (-1021 - e);
768 e = -1022;
769 }
770
771 r |= ((uint64_t)(e + 1022)) << 52;
772 r |= m & 0xfffffffffffffU;
773 #endif
774
775 return r;
776 }
777
778 /* converts an ieee double/binary64 to a double */
779 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
780 ecb_function_ double
781 ecb_binary64_to_double (uint64_t x)
782 {
783 double r;
784
785 #if ECB_STDFP
786 memcpy (&r, &x, 8);
787 #else
788 /* emulation, only works for normals and subnormals and +0 */
789 int neg = x >> 63;
790 int e = (x >> 52) & 0x7ffU;
791
792 x &= 0xfffffffffffffU;
793
794 if (e)
795 x |= 0x10000000000000U;
796 else
797 e = 1;
798
799 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
800 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
801
802 r = neg ? -r : r;
803 #endif
804
805 return r;
806 }
807
808#endif
809
810#endif
811

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