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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 1.15 by root, Wed Jul 25 16:12:28 2012 UTC

… …
29 29
30#ifndef ECB_H 30#ifndef ECB_H
31#define ECB_H 31#define ECB_H
32 32
33/* 16 bits major, 16 bits minor */ 33/* 16 bits major, 16 bits minor */
34#define ECB_VERSION 0x00010001 34#define ECB_VERSION 0x00010002
35 35
36#ifdef _WIN32 36#ifdef _WIN32
37 typedef signed char int8_t; 37 typedef signed char int8_t;
38 typedef unsigned char uint8_t; 38 typedef unsigned char uint8_t;
39 typedef signed short int16_t; 39 typedef signed short int16_t;
… …
54 #else 54 #else
55 #define ECB_PTRSIZE 4 55 #define ECB_PTRSIZE 4
56 typedef uint32_t uintptr_t; 56 typedef uint32_t uintptr_t;
57 typedef int32_t intptr_t; 57 typedef int32_t intptr_t;
58 #endif 58 #endif
59 typedef intptr_t ptrdiff_t;
60#else 59#else
61 #include <inttypes.h> 60 #include <inttypes.h>
62 #if UINTMAX_MAX > 0xffffffffU 61 #if UINTMAX_MAX > 0xffffffffU
63 #define ECB_PTRSIZE 8 62 #define ECB_PTRSIZE 8
64 #else 63 #else
… …
84#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */ 83#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
85#define ECB_C99 (__STDC_VERSION__ >= 199901L) 84#define ECB_C99 (__STDC_VERSION__ >= 199901L)
86#define ECB_C11 (__STDC_VERSION__ >= 201112L) 85#define ECB_C11 (__STDC_VERSION__ >= 201112L)
87#define ECB_CPP (__cplusplus+0) 86#define ECB_CPP (__cplusplus+0)
88#define ECB_CPP11 (__cplusplus >= 201103L) 87#define ECB_CPP11 (__cplusplus >= 201103L)
88
89#if ECB_CPP
90 #define ECB_EXTERN_C extern "C"
91 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
92 #define ECB_EXTERN_C_END }
93#else
94 #define ECB_EXTERN_C extern
95 #define ECB_EXTERN_C_BEG
96 #define ECB_EXTERN_C_END
97#endif
89 98
90/*****************************************************************************/ 99/*****************************************************************************/
91 100
92/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ 101/* 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 */ 102/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
… …
139 148
140#ifndef ECB_MEMORY_FENCE 149#ifndef ECB_MEMORY_FENCE
141 #if ECB_GCC_VERSION(4,7) 150 #if ECB_GCC_VERSION(4,7)
142 /* see comment below (stdatomic.h) about the C11 memory model. */ 151 /* see comment below (stdatomic.h) about the C11 memory model. */
143 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) 152 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
153
154 /* The __has_feature syntax from clang is so misdesigned that we cannot use it
155 * without risking compile time errors with other compilers. We *could*
156 * define our own ecb_clang_has_feature, but I just can't be bothered to work
157 * around * this shit time and again.
144 #elif defined __clang && __has_feature (cxx_atomic) 158 * #elif defined __clang && __has_feature (cxx_atomic)
145 /* see comment below (stdatomic.h) about the C11 memory model. */ 159 * // see comment below (stdatomic.h) about the C11 memory model.
146 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) 160 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
161 */
162
147 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 163 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
148 #define ECB_MEMORY_FENCE __sync_synchronize () 164 #define ECB_MEMORY_FENCE __sync_synchronize ()
149 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 165 #elif _MSC_VER >= 1400 /* VC++ 2005 */
150 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 166 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
151 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 167 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
… …
525 } 541 }
526#else 542#else
527 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 543 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
528#endif 544#endif
529 545
546/*******************************************************************************/
547/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
548
549/* basically, everything uses "ieee pure-endian" floating point numbers */
550/* the only noteworthy exception is ancient armle, which uses order 43218765 */
551#if 0 \
552 || __i386 || __i386__ \
553 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
554 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
555 || defined __arm__ && defined __ARM_EABI__ \
556 || defined __s390__ || defined __s390x__ \
557 || defined __mips__ \
558 || defined __alpha__ \
559 || defined __hppa__ \
560 || defined __ia64__ \
561 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
562 #define ECB_STDFP 1
563 #include <string.h> /* for memcpy */
564#else
565 #define ECB_STDFP 0
566 #include <math.h> /* for frexp*, ldexp* */
567#endif
568
569#ifndef ECB_NO_LIBM
570
571 /* convert a float to ieee single/binary32 */
572 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
573 ecb_function_ uint32_t
574 ecb_float_to_binary32 (float x)
575 {
576 uint32_t r;
577
578 #if ECB_STDFP
579 memcpy (&r, &x, 4);
580 #else
581 /* slow emulation, works for anything but -0 */
582 uint32_t m;
583 int e;
584
585 if (x == 0e0f ) return 0x00000000U;
586 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
587 if (x < -3.40282346638528860e+38f) return 0xff800000U;
588 if (x != x ) return 0x7fbfffffU;
589
590 m = frexpf (x, &e) * 0x1000000U;
591
592 r = m & 0x80000000U;
593
594 if (r)
595 m = -m;
596
597 if (e <= -126)
598 {
599 m &= 0xffffffU;
600 m >>= (-125 - e);
601 e = -126;
602 }
603
604 r |= (e + 126) << 23;
605 r |= m & 0x7fffffU;
530#endif 606 #endif
531 607
608 return r;
609 }
610
611 /* converts an ieee single/binary32 to a float */
612 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
613 ecb_function_ float
614 ecb_binary32_to_float (uint32_t x)
615 {
616 float r;
617
618 #if ECB_STDFP
619 memcpy (&r, &x, 4);
620 #else
621 /* emulation, only works for normals and subnormals and +0 */
622 int neg = x >> 31;
623 int e = (x >> 23) & 0xffU;
624
625 x &= 0x7fffffU;
626
627 if (e)
628 x |= 0x800000U;
629 else
630 e = 1;
631
632 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
633 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
634
635 r = neg ? -r : r;
636 #endif
637
638 return r;
639 }
640
641 /* convert a double to ieee double/binary64 */
642 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
643 ecb_function_ uint64_t
644 ecb_double_to_binary64 (double x)
645 {
646 uint64_t r;
647
648 #if ECB_STDFP
649 memcpy (&r, &x, 8);
650 #else
651 /* slow emulation, works for anything but -0 */
652 uint64_t m;
653 int e;
654
655 if (x == 0e0 ) return 0x0000000000000000U;
656 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
657 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
658 if (x != x ) return 0X7ff7ffffffffffffU;
659
660 m = frexp (x, &e) * 0x20000000000000U;
661
662 r = m & 0x8000000000000000;;
663
664 if (r)
665 m = -m;
666
667 if (e <= -1022)
668 {
669 m &= 0x1fffffffffffffU;
670 m >>= (-1021 - e);
671 e = -1022;
672 }
673
674 r |= ((uint64_t)(e + 1022)) << 52;
675 r |= m & 0xfffffffffffffU;
676 #endif
677
678 return r;
679 }
680
681 /* converts an ieee double/binary64 to a double */
682 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
683 ecb_function_ double
684 ecb_binary64_to_double (uint64_t x)
685 {
686 double r;
687
688 #if ECB_STDFP
689 memcpy (&r, &x, 8);
690 #else
691 /* emulation, only works for normals and subnormals and +0 */
692 int neg = x >> 63;
693 int e = (x >> 52) & 0x7ffU;
694
695 x &= 0xfffffffffffffU;
696
697 if (e)
698 x |= 0x10000000000000U;
699 else
700 e = 1;
701
702 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
703 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
704
705 r = neg ? -r : r;
706 #endif
707
708 return r;
709 }
710
711#endif
712
713#endif
714

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