ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libecb/ecb.h
(Generate patch)

Comparing libecb/ecb.h (file contents):
Revision 1.99 by root, Thu Jun 7 21:28:36 2012 UTC vs.
Revision 1.103 by root, Thu Jun 28 18:04:44 2012 UTC

… …
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)
144 #elif defined __clang && __has_feature (cxx_atomic) 153 /*#elif defined __clang && __has_feature (cxx_atomic)*/
145 /* see comment below (stdatomic.h) about the C11 memory model. */ 154 /* see comment below (stdatomic.h) about the C11 memory model. */
146 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) 155 /*#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)*/
147 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 156 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
148 #define ECB_MEMORY_FENCE __sync_synchronize () 157 #define ECB_MEMORY_FENCE __sync_synchronize ()
149 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 158 #elif _MSC_VER >= 1400 /* VC++ 2005 */
150 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 159 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
151 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 160 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
… …
459 ecb_inline void ecb_unreachable (void) ecb_noreturn; 468 ecb_inline void ecb_unreachable (void) ecb_noreturn;
460 ecb_inline void ecb_unreachable (void) { } 469 ecb_inline void ecb_unreachable (void) { }
461#endif 470#endif
462 471
463/* try to tell the compiler that some condition is definitely true */ 472/* try to tell the compiler that some condition is definitely true */
464#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 473#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
465 474
466ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; 475ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
467ecb_inline unsigned char 476ecb_inline unsigned char
468ecb_byteorder_helper (void) 477ecb_byteorder_helper (void)
469{ 478{
… …
525 } 534 }
526#else 535#else
527 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 536 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
528#endif 537#endif
529 538
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/*******************************************************************************/
559/* floating point stuff, can be disabled by defining ECB_NO_FP */
560
561#ifndef ECB_NO_FP
562
563 /* basically, everything uses "ieee pure-endian" floating point numbers */
564 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
565 #if 0 \
566 || __i386 || __i386__ \
567 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
568 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
569 || defined __arm__ && defined __ARM_EABI__ \
570 || defined __s390__ || defined __s390x__ \
571 || defined __mips__ \
572 || defined __alpha__ \
573 || defined __hppa__ \
574 || defined __ia64__ \
575 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
576 #define ECB_STDFP 1
577 #else
578 #define ECB_STDFP 0
530#endif 579 #endif
531 580
581 // convert a float to ieee single/binary32
582 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
583 ecb_function_ uint32_t
584 ecb_float_to_binary32 (float x)
585 {
586 uint32_t r;
587
588 #if ECB_STDFP
589 ((char *)&r) [0] = ((char *)&x)[0];
590 ((char *)&r) [1] = ((char *)&x)[1];
591 ((char *)&r) [2] = ((char *)&x)[2];
592 ((char *)&r) [3] = ((char *)&x)[3];
593 #else
594 /* slow emulation, works for anything but nan's and -0 */
595 ECB_EXTERN_C float frexpf (float v, int *e);
596 uint32_t m;
597 int e;
598
599 if (x == 0e0f ) return 0;
600 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
601 if (x < -3.40282346638528860e+38f) return 0xff800000U;
602
603 m = frexpf (x, &e) * 0x1000000U;
604
605 r = m & 0x80000000U;
606
607 if (r)
608 m = -m;
609
610 if (e < -125)
611 {
612 m &= 0xffffffU;
613 m >>= (-125 - e);
614 e = -126;
615 }
616
617 r |= (e + 126) << 23;
618 r |= m & 0x7fffffU;
619 #endif
620
621 return r;
622 }
623
624 // converts a ieee single/binary32 to a float
625 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
626 ecb_function_ float
627 ecb_binary32_to_float (uint32_t x)
628 {
629 float r;
630
631 #if ECB_STDFP
632 ((char *)&r) [0] = ((char *)&x)[0];
633 ((char *)&r) [1] = ((char *)&x)[1];
634 ((char *)&r) [2] = ((char *)&x)[2];
635 ((char *)&r) [3] = ((char *)&x)[3];
636 #else
637 /* 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;
641 int e = (x >> 23) & 0xffU;
642
643 x &= 0x7fffffU;
644
645 if (e)
646 x |= 0x800000U;
647
648 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
649 r = ldexpf (x * (1.f / 0x1000000U), e - 126);
650
651 r = neg ? -r : r;
652 #endif
653
654 return r;
655 }
656
657 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
658 ecb_function_ uint64_t
659 ecb_double_to_binary64 (double x)
660 {
661 }
662
663#endif
664
665#endif
666

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines