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Comparing libeio/ecb.h (file contents):
Revision 1.13 by root, Sat Jun 2 20:13:26 2012 UTC vs.
Revision 1.18 by root, Sat Sep 7 23:18:23 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;
… …
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
65 #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
66 #endif 74 #endif
67#endif 75#endif
68 76
69/* many compilers define _GNUC_ to some versions but then only implement 77/* many compilers define _GNUC_ to some versions but then only implement
70 * what their idiot authors think are the "more important" extensions, 78 * what their idiot authors think are the "more important" extensions,
… …
84#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */ 92#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
85#define ECB_C99 (__STDC_VERSION__ >= 199901L) 93#define ECB_C99 (__STDC_VERSION__ >= 199901L)
86#define ECB_C11 (__STDC_VERSION__ >= 201112L) 94#define ECB_C11 (__STDC_VERSION__ >= 201112L)
87#define ECB_CPP (__cplusplus+0) 95#define ECB_CPP (__cplusplus+0)
88#define ECB_CPP11 (__cplusplus >= 201103L) 96#define ECB_CPP11 (__cplusplus >= 201103L)
97
98#if ECB_CPP
99 #define ECB_EXTERN_C extern "C"
100 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
101 #define ECB_EXTERN_C_END }
102#else
103 #define ECB_EXTERN_C extern
104 #define ECB_EXTERN_C_BEG
105 #define ECB_EXTERN_C_END
106#endif
89 107
90/*****************************************************************************/ 108/*****************************************************************************/
91 109
92/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ 110/* 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 */ 111/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
… …
123 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") 141 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
124 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") 142 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
125 #elif defined __s390__ || defined __s390x__ 143 #elif defined __s390__ || defined __s390x__
126 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") 144 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
127 #elif defined __mips__ 145 #elif defined __mips__
146 /* GNU/Linux emulates sync on mips1 architectures, so we force it's use */
147 /* 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") 148 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
129 #elif defined __alpha__ 149 #elif defined __alpha__
130 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") 150 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
131 #elif defined __hppa__ 151 #elif defined __hppa__
132 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") 152 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
133 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") 153 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
… …
139 159
140#ifndef ECB_MEMORY_FENCE 160#ifndef ECB_MEMORY_FENCE
141 #if ECB_GCC_VERSION(4,7) 161 #if ECB_GCC_VERSION(4,7)
142 /* see comment below (stdatomic.h) about the C11 memory model. */ 162 /* see comment below (stdatomic.h) about the C11 memory model. */
143 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) 163 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
164
165 /* The __has_feature syntax from clang is so misdesigned that we cannot use it
166 * without risking compile time errors with other compilers. We *could*
167 * define our own ecb_clang_has_feature, but I just can't be bothered to work
168 * around this shit time and again.
144 #elif defined __clang && __has_feature (cxx_atomic) 169 * #elif defined __clang && __has_feature (cxx_atomic)
145 /* see comment below (stdatomic.h) about the C11 memory model. */ 170 * // see comment below (stdatomic.h) about the C11 memory model.
146 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) 171 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
172 */
173
147 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 174 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
148 #define ECB_MEMORY_FENCE __sync_synchronize () 175 #define ECB_MEMORY_FENCE __sync_synchronize ()
149 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 176 #elif _MSC_VER >= 1400 /* VC++ 2005 */
150 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 177 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
151 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 178 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
… …
459 ecb_inline void ecb_unreachable (void) ecb_noreturn; 486 ecb_inline void ecb_unreachable (void) ecb_noreturn;
460 ecb_inline void ecb_unreachable (void) { } 487 ecb_inline void ecb_unreachable (void) { }
461#endif 488#endif
462 489
463/* try to tell the compiler that some condition is definitely true */ 490/* try to tell the compiler that some condition is definitely true */
464#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 491#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
465 492
466ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; 493ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
467ecb_inline unsigned char 494ecb_inline unsigned char
468ecb_byteorder_helper (void) 495ecb_byteorder_helper (void)
469{ 496{
470 const uint32_t u = 0x11223344; 497 /* the union code still generates code under pressure in gcc, */
471 return *(unsigned char *)&u; 498 /* but less than using pointers, and always seems to */
499 /* successfully return a constant. */
500 /* the reason why we have this horrible preprocessor mess */
501 /* is to avoid it in all cases, at least on common architectures */
502 /* or when using a recent enough gcc version (>= 4.6) */
503#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
504 return 0x44;
505#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
506 return 0x44;
507#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
508 return 0x11;
509#else
510 union
511 {
512 uint32_t i;
513 uint8_t c;
514 } u = { 0x11223344 };
515 return u.c;
516#endif
472} 517}
473 518
474ecb_inline ecb_bool ecb_big_endian (void) ecb_const; 519ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
475ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } 520ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
476ecb_inline ecb_bool ecb_little_endian (void) ecb_const; 521ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
… …
507 } 552 }
508#else 553#else
509 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 554 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
510#endif 555#endif
511 556
557/*******************************************************************************/
558/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
559
560/* basically, everything uses "ieee pure-endian" floating point numbers */
561/* the only noteworthy exception is ancient armle, which uses order 43218765 */
562#if 0 \
563 || __i386 || __i386__ \
564 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
565 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
566 || defined __arm__ && defined __ARM_EABI__ \
567 || defined __s390__ || defined __s390x__ \
568 || defined __mips__ \
569 || defined __alpha__ \
570 || defined __hppa__ \
571 || defined __ia64__ \
572 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
573 #define ECB_STDFP 1
574 #include <string.h> /* for memcpy */
575#else
576 #define ECB_STDFP 0
577 #include <math.h> /* for frexp*, ldexp* */
578#endif
579
580#ifndef ECB_NO_LIBM
581
582 /* convert a float to ieee single/binary32 */
583 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
584 ecb_function_ uint32_t
585 ecb_float_to_binary32 (float x)
586 {
587 uint32_t r;
588
589 #if ECB_STDFP
590 memcpy (&r, &x, 4);
591 #else
592 /* slow emulation, works for anything but -0 */
593 uint32_t m;
594 int e;
595
596 if (x == 0e0f ) return 0x00000000U;
597 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
598 if (x < -3.40282346638528860e+38f) return 0xff800000U;
599 if (x != x ) return 0x7fbfffffU;
600
601 m = frexpf (x, &e) * 0x1000000U;
602
603 r = m & 0x80000000U;
604
605 if (r)
606 m = -m;
607
608 if (e <= -126)
609 {
610 m &= 0xffffffU;
611 m >>= (-125 - e);
612 e = -126;
613 }
614
615 r |= (e + 126) << 23;
616 r |= m & 0x7fffffU;
512#endif 617 #endif
513 618
619 return r;
620 }
621
622 /* converts an ieee single/binary32 to a float */
623 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
624 ecb_function_ float
625 ecb_binary32_to_float (uint32_t x)
626 {
627 float r;
628
629 #if ECB_STDFP
630 memcpy (&r, &x, 4);
631 #else
632 /* emulation, only works for normals and subnormals and +0 */
633 int neg = x >> 31;
634 int e = (x >> 23) & 0xffU;
635
636 x &= 0x7fffffU;
637
638 if (e)
639 x |= 0x800000U;
640 else
641 e = 1;
642
643 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
644 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
645
646 r = neg ? -r : r;
647 #endif
648
649 return r;
650 }
651
652 /* convert a double to ieee double/binary64 */
653 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
654 ecb_function_ uint64_t
655 ecb_double_to_binary64 (double x)
656 {
657 uint64_t r;
658
659 #if ECB_STDFP
660 memcpy (&r, &x, 8);
661 #else
662 /* slow emulation, works for anything but -0 */
663 uint64_t m;
664 int e;
665
666 if (x == 0e0 ) return 0x0000000000000000U;
667 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
668 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
669 if (x != x ) return 0X7ff7ffffffffffffU;
670
671 m = frexp (x, &e) * 0x20000000000000U;
672
673 r = m & 0x8000000000000000;;
674
675 if (r)
676 m = -m;
677
678 if (e <= -1022)
679 {
680 m &= 0x1fffffffffffffU;
681 m >>= (-1021 - e);
682 e = -1022;
683 }
684
685 r |= ((uint64_t)(e + 1022)) << 52;
686 r |= m & 0xfffffffffffffU;
687 #endif
688
689 return r;
690 }
691
692 /* converts an ieee double/binary64 to a double */
693 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
694 ecb_function_ double
695 ecb_binary64_to_double (uint64_t x)
696 {
697 double r;
698
699 #if ECB_STDFP
700 memcpy (&r, &x, 8);
701 #else
702 /* emulation, only works for normals and subnormals and +0 */
703 int neg = x >> 63;
704 int e = (x >> 52) & 0x7ffU;
705
706 x &= 0xfffffffffffffU;
707
708 if (e)
709 x |= 0x10000000000000U;
710 else
711 e = 1;
712
713 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
714 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
715
716 r = neg ? -r : r;
717 #endif
718
719 return r;
720 }
721
722#endif
723
724#endif
725

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