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Comparing libecb/ecb.h (file contents):
Revision 1.102 by root, Thu Jun 28 17:23:58 2012 UTC vs.
Revision 1.120 by root, Sat Oct 26 09:13:54 2013 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 0x00010003
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;
… …
60 #include <inttypes.h> 60 #include <inttypes.h>
61 #if UINTMAX_MAX > 0xffffffffU 61 #if UINTMAX_MAX > 0xffffffffU
62 #define ECB_PTRSIZE 8 62 #define ECB_PTRSIZE 8
63 #else 63 #else
64 #define ECB_PTRSIZE 4 64 #define ECB_PTRSIZE 4
65 #endif
66#endif
67
68/* work around x32 idiocy by defining proper macros */
69#if __x86_64 || _M_AMD64
70 #if _ILP32
71 #define ECB_AMD64_X32 1
72 #else
73 #define ECB_AMD64 1
65 #endif 74 #endif
66#endif 75#endif
67 76
68/* many compilers define _GNUC_ to some versions but then only implement 77/* many compilers define _GNUC_ to some versions but then only implement
69 * what their idiot authors think are the "more important" extensions, 78 * what their idiot authors think are the "more important" extensions,
… …
132 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") 141 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
133 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") 142 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
134 #elif defined __s390__ || defined __s390x__ 143 #elif defined __s390__ || defined __s390x__
135 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") 144 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
136 #elif defined __mips__ 145 #elif defined __mips__
146 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
147 /* 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") 148 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
138 #elif defined __alpha__ 149 #elif defined __alpha__
139 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") 150 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
140 #elif defined __hppa__ 151 #elif defined __hppa__
141 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") 152 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
142 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") 153 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
143 #elif defined __ia64__ 154 #elif defined __ia64__
144 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory") 155 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
156 #elif defined __m68k__
157 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
158 #elif defined __m88k__
159 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
160 #elif defined __sh__
161 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
145 #endif 162 #endif
146 #endif 163 #endif
147#endif 164#endif
148 165
149#ifndef ECB_MEMORY_FENCE 166#ifndef ECB_MEMORY_FENCE
150 #if ECB_GCC_VERSION(4,7) 167 #if ECB_GCC_VERSION(4,7)
151 /* see comment below (stdatomic.h) about the C11 memory model. */ 168 /* see comment below (stdatomic.h) about the C11 memory model. */
152 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) 169 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
170
171 /* The __has_feature syntax from clang is so misdesigned that we cannot use it
172 * without risking compile time errors with other compilers. We *could*
173 * define our own ecb_clang_has_feature, but I just can't be bothered to work
174 * around this shit time and again.
153 /*#elif defined __clang && __has_feature (cxx_atomic)*/ 175 * #elif defined __clang && __has_feature (cxx_atomic)
154 /* see comment below (stdatomic.h) about the C11 memory model. */ 176 * // see comment below (stdatomic.h) about the C11 memory model.
155 /*#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)*/ 177 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
178 */
179
156 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 180 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
157 #define ECB_MEMORY_FENCE __sync_synchronize () 181 #define ECB_MEMORY_FENCE __sync_synchronize ()
158 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 182 #elif _MSC_VER >= 1400 /* VC++ 2005 */
159 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 183 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
160 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 184 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
… …
475ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; 499ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
476ecb_inline unsigned char 500ecb_inline unsigned char
477ecb_byteorder_helper (void) 501ecb_byteorder_helper (void)
478{ 502{
479 /* the union code still generates code under pressure in gcc, */ 503 /* the union code still generates code under pressure in gcc, */
480 /* but less than using pointers, and always seem to */ 504 /* but less than using pointers, and always seems to */
481 /* successfully return a constant. */ 505 /* successfully return a constant. */
482 /* the reason why we have this horrible preprocessor mess */ 506 /* the reason why we have this horrible preprocessor mess */
483 /* is to avoid it in all cases, at least on common architectures */ 507 /* is to avoid it in all cases, at least on common architectures */
484 /* and yes, gcc defines __BYTE_ORDER__, g++ does not */ 508 /* or when using a recent enough gcc version (>= 4.6) */
485#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64 509#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
486 return 0x44; 510 return 0x44;
487#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 511#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
488 return 0x44; 512 return 0x44;
489#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 513#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
490 retrurn 0x11; 514 return 0x11;
491#else 515#else
492 union 516 union
493 { 517 {
494 uint32_t i; 518 uint32_t i;
495 uint8_t c; 519 uint8_t c;
… …
534 } 558 }
535#else 559#else
536 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 560 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
537#endif 561#endif
538 562
539#if __STDC_IEC_559__ 563/*******************************************************************************/
540 // we assume this is defined for most C and many C++ compilers 564/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
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
557 565
566/* basically, everything uses "ieee pure-endian" floating point numbers */
567/* the only noteworthy exception is ancient armle, which uses order 43218765 */
568#if 0 \
569 || __i386 || __i386__ \
570 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
571 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
572 || defined __arm__ && defined __ARM_EABI__ \
573 || defined __s390__ || defined __s390x__ \
574 || defined __mips__ \
575 || defined __alpha__ \
576 || defined __hppa__ \
577 || defined __ia64__ \
578 || defined __m68k__ \
579 || defined __m88k__ \
580 || defined __sh__ \
581 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
582 #define ECB_STDFP 1
583 #include <string.h> /* for memcpy */
584#else
585 #define ECB_STDFP 0
586#endif
587
588#ifndef ECB_NO_LIBM
589
590 #include <math.h> /* for frexp*, ldexp* */
591
592 /* converts an ieee half/binary16 to a float */
593 ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
594 ecb_function_ float
595 ecb_binary16_to_float (uint16_t x)
596 {
597 int e = (x >> 10) & 0x1f;
598 int m = x & 0x3ff;
599 float r;
600
601 if (!e)
602 r = ldexpf (m , -24);
603 else if (e != 31)
604 r = ldexpf (m + 0x400, e - 25);
605 else if (m)
606 #ifdef NAN
607 r = NAN;
608 #endif
609 else
610 r = INFINITY;
611
612 return x & 0x8000 ? -r : r;
613 }
614
558// convert a float to ieee single/binary32 615 /* convert a float to ieee single/binary32 */
559ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const; 616 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
560ecb_function_ uint32_t 617 ecb_function_ uint32_t
561ecb_float_to_binary32 (float x) 618 ecb_float_to_binary32 (float x)
562{ 619 {
620 uint32_t r;
621
622 #if ECB_STDFP
623 memcpy (&r, &x, 4);
624 #else
563 /* slow emulation, works for anything but nan's and -0 */ 625 /* slow emulation, works for anything but -0 */
564 ECB_EXTERN_C float frexpf (float v, int *e);
565 uint32_t r, m; 626 uint32_t m;
566 int e; 627 int e;
567 628
568 if (x == 0e0f ) return 0; 629 if (x == 0e0f ) return 0x00000000U;
569 if (x > +3.40282346638528860e+38f) return 0x7f800000U; 630 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
570 if (x < -3.40282346638528860e+38f) return 0xff800000U; 631 if (x < -3.40282346638528860e+38f) return 0xff800000U;
632 if (x != x ) return 0x7fbfffffU;
571 633
572 m = frexpf (x, &e) * 0x1000000U; 634 m = frexpf (x, &e) * 0x1000000U;
573 635
574 r = m & 0x80000000U; 636 r = m & 0x80000000U;
575 637
576 if (r) 638 if (r)
577 m = -m; 639 m = -m;
578 640
579 if (e < -125) 641 if (e <= -126)
580 { 642 {
581 m &= 0xffffffU; 643 m &= 0xffffffU;
582 m >>= (-125 - e); 644 m >>= (-125 - e);
583 e = -126; 645 e = -126;
584 } 646 }
585 647
586 r |= (e + 126) << 23; 648 r |= (e + 126) << 23;
587 r |= m & 0x7fffffU; 649 r |= m & 0x7fffffU;
650 #endif
588 651
589 return r; 652 return r;
590} 653 }
591 654
592// converts a ieee single/binary32 to a float 655 /* converts an ieee single/binary32 to a float */
593ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const; 656 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
594ecb_function_ float 657 ecb_function_ float
595ecb_binary32_to_float (uint32_t x) 658 ecb_binary32_to_float (uint32_t x)
596{ 659 {
660 float r;
661
662 #if ECB_STDFP
663 memcpy (&r, &x, 4);
664 #else
597 /* emulation, only works for normals and subnormals and +0 */ 665 /* emulation, only works for normals and subnormals and +0 */
598 ECB_EXTERN_C float ldexpf (float x, int e);
599
600 int neg = x >> 31; 666 int neg = x >> 31;
601 int e = (x >> 23) & 0xffU; 667 int e = (x >> 23) & 0xffU;
602 float r;
603 668
604 x &= 0x7fffffU; 669 x &= 0x7fffffU;
605 670
606 if (e) 671 if (e)
607 x |= 0x800000U; 672 x |= 0x800000U;
673 else
674 e = 1;
608 675
609 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ 676 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
610 r = ldexpf (x * (1.f / 0x1000000U), e - 126); 677 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
611 678
612 return neg ? -r : r; 679 r = neg ? -r : r;
613} 680 #endif
614 681
682 return r;
683 }
684
685 /* convert a double to ieee double/binary64 */
615ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const; 686 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
616ecb_function_ uint64_t 687 ecb_function_ uint64_t
617ecb_double_to_binary64 (double x) 688 ecb_double_to_binary64 (double x)
618{ 689 {
619} 690 uint64_t r;
620 691
692 #if ECB_STDFP
693 memcpy (&r, &x, 8);
694 #else
695 /* slow emulation, works for anything but -0 */
696 uint64_t m;
697 int e;
698
699 if (x == 0e0 ) return 0x0000000000000000U;
700 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
701 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
702 if (x != x ) return 0X7ff7ffffffffffffU;
703
704 m = frexp (x, &e) * 0x20000000000000U;
705
706 r = m & 0x8000000000000000;;
707
708 if (r)
709 m = -m;
710
711 if (e <= -1022)
712 {
713 m &= 0x1fffffffffffffU;
714 m >>= (-1021 - e);
715 e = -1022;
716 }
717
718 r |= ((uint64_t)(e + 1022)) << 52;
719 r |= m & 0xfffffffffffffU;
621#endif 720 #endif
622 721
722 return r;
723 }
724
725 /* converts an ieee double/binary64 to a double */
726 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
727 ecb_function_ double
728 ecb_binary64_to_double (uint64_t x)
729 {
730 double r;
731
732 #if ECB_STDFP
733 memcpy (&r, &x, 8);
734 #else
735 /* emulation, only works for normals and subnormals and +0 */
736 int neg = x >> 63;
737 int e = (x >> 52) & 0x7ffU;
738
739 x &= 0xfffffffffffffU;
740
741 if (e)
742 x |= 0x10000000000000U;
743 else
744 e = 1;
745
746 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
747 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
748
749 r = neg ? -r : r;
750 #endif
751
752 return r;
753 }
754
755#endif
756
757#endif
758

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