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Comparing libecb/ecb.h (file contents):
Revision 1.76 by root, Wed Jan 25 20:23:12 2012 UTC vs.
Revision 1.104 by root, Thu Jun 28 19:38:29 2012 UTC

… …
28 */ 28 */
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 */
34#define ECB_VERSION 0x00010001
35
33#ifdef _WIN32 36#ifdef _WIN32
34 typedef signed char int8_t; 37 typedef signed char int8_t;
35 typedef unsigned char uint8_t; 38 typedef unsigned char uint8_t;
36 typedef signed short int16_t; 39 typedef signed short int16_t;
37 typedef unsigned short uint16_t; 40 typedef unsigned short uint16_t;
… …
42 typedef unsigned long long uint64_t; 45 typedef unsigned long long uint64_t;
43 #else /* _MSC_VER || __BORLANDC__ */ 46 #else /* _MSC_VER || __BORLANDC__ */
44 typedef signed __int64 int64_t; 47 typedef signed __int64 int64_t;
45 typedef unsigned __int64 uint64_t; 48 typedef unsigned __int64 uint64_t;
46 #endif 49 #endif
50 #ifdef _WIN64
51 #define ECB_PTRSIZE 8
52 typedef uint64_t uintptr_t;
53 typedef int64_t intptr_t;
54 #else
55 #define ECB_PTRSIZE 4
56 typedef uint32_t uintptr_t;
57 typedef int32_t intptr_t;
58 #endif
47#else 59#else
48 #include <inttypes.h> 60 #include <inttypes.h>
61 #if UINTMAX_MAX > 0xffffffffU
62 #define ECB_PTRSIZE 8
63 #else
64 #define ECB_PTRSIZE 4
65 #endif
49#endif 66#endif
50 67
51/* many compilers define _GNUC_ to some versions but then only implement 68/* many compilers define _GNUC_ to some versions but then only implement
52 * what their idiot authors think are the "more important" extensions, 69 * what their idiot authors think are the "more important" extensions,
53 * causing enormous grief in return for some better fake benchmark numbers. 70 * causing enormous grief in return for some better fake benchmark numbers.
54 * or so. 71 * or so.
55 * we try to detect these and simply assume they are not gcc - if they have 72 * we try to detect these and simply assume they are not gcc - if they have
56 * an issue with that they should have done it right in the first place. 73 * an issue with that they should have done it right in the first place.
57 */ 74 */
58#ifndef ECB_GCC_VERSION 75#ifndef ECB_GCC_VERSION
59 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__) 76 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
60 #define ECB_GCC_VERSION(major,minor) 0 77 #define ECB_GCC_VERSION(major,minor) 0
61 #else 78 #else
62 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 79 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
63 #endif 80 #endif
64#endif 81#endif
65 82
83#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
84#define ECB_C99 (__STDC_VERSION__ >= 199901L)
85#define ECB_C11 (__STDC_VERSION__ >= 201112L)
86#define ECB_CPP (__cplusplus+0)
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
98
66/*****************************************************************************/ 99/*****************************************************************************/
67 100
68/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ 101/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
69/* 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 */
70 103
71#if ECB_NO_THREADS || ECB_NO_SMP 104#if ECB_NO_THREADS
105 #define ECB_NO_SMP 1
106#endif
107
108#if ECB_NO_SMP
72 #define ECB_MEMORY_FENCE do { } while (0) 109 #define ECB_MEMORY_FENCE do { } while (0)
73#endif 110#endif
74 111
75#ifndef ECB_MEMORY_FENCE 112#ifndef ECB_MEMORY_FENCE
76 #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || defined(__clang__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 113 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
77 #if __i386 || __i386__ 114 #if __i386 || __i386__
78 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 115 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
79 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ 116 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
80 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ 117 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
81 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ 118 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
82 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 119 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
83 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 120 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
84 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ 121 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
85 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ 122 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
86 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 123 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
87 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \ 124 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
88 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__) 125 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
89 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") 126 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
90 #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \ 127 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
91 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ ) 128 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
92 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") 129 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
93 #elif __sparc || __sparc__ 130 #elif __sparc || __sparc__
94 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory") 131 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
95 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") 132 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
96 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") 133 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
134 #elif defined __s390__ || defined __s390x__
135 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
136 #elif defined __mips__
137 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
138 #elif defined __alpha__
139 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
140 #elif defined __hppa__
141 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
142 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
143 #elif defined __ia64__
144 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
97 #endif 145 #endif
98 #endif 146 #endif
99#endif 147#endif
100 148
101#ifndef ECB_MEMORY_FENCE 149#ifndef ECB_MEMORY_FENCE
150 #if ECB_GCC_VERSION(4,7)
151 /* see comment below (stdatomic.h) about the C11 memory model. */
152 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
153 /*#elif defined __clang && __has_feature (cxx_atomic)*/
154 /* see comment below (stdatomic.h) about the C11 memory model. */
155 /*#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)*/
102 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__) 156 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
103 #define ECB_MEMORY_FENCE __sync_synchronize () 157 #define ECB_MEMORY_FENCE __sync_synchronize ()
104 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
105 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
106 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 158 #elif _MSC_VER >= 1400 /* VC++ 2005 */
107 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 159 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
108 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 160 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
109 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ 161 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
110 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () 162 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
111 #elif defined(_WIN32) 163 #elif defined _WIN32
112 #include <WinNT.h> 164 #include <WinNT.h>
113 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ 165 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
114 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 166 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
115 #include <mbarrier.h> 167 #include <mbarrier.h>
116 #define ECB_MEMORY_FENCE __machine_rw_barrier () 168 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
117 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier () 169 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
118 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier () 170 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
171 #elif __xlC__
172 #define ECB_MEMORY_FENCE __sync ()
173 #endif
174#endif
175
176#ifndef ECB_MEMORY_FENCE
177 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
178 /* we assume that these memory fences work on all variables/all memory accesses, */
179 /* not just C11 atomics and atomic accesses */
180 #include <stdatomic.h>
181 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
182 /* any fence other than seq_cst, which isn't very efficient for us. */
183 /* Why that is, we don't know - either the C11 memory model is quite useless */
184 /* for most usages, or gcc and clang have a bug */
185 /* I *currently* lean towards the latter, and inefficiently implement */
186 /* all three of ecb's fences as a seq_cst fence */
187 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
119 #endif 188 #endif
120#endif 189#endif
121 190
122#ifndef ECB_MEMORY_FENCE 191#ifndef ECB_MEMORY_FENCE
123 #if !ECB_AVOID_PTHREADS 192 #if !ECB_AVOID_PTHREADS
… …
135 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; 204 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
136 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) 205 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
137 #endif 206 #endif
138#endif 207#endif
139 208
140#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE) 209#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
141 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE 210 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
142#endif 211#endif
143 212
144#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE) 213#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
145 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 214 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
146#endif 215#endif
147 216
148/*****************************************************************************/ 217/*****************************************************************************/
149
150#define ECB_C99 (__STDC_VERSION__ >= 199901L)
151 218
152#if __cplusplus 219#if __cplusplus
153 #define ecb_inline static inline 220 #define ecb_inline static inline
154#elif ECB_GCC_VERSION(2,5) 221#elif ECB_GCC_VERSION(2,5)
155 #define ecb_inline static __inline__ 222 #define ecb_inline static __inline__
… …
194#elif ECB_GCC_VERSION(3,0) 261#elif ECB_GCC_VERSION(3,0)
195 #define ecb_decltype(x) __typeof(x) 262 #define ecb_decltype(x) __typeof(x)
196#endif 263#endif
197 264
198#define ecb_noinline ecb_attribute ((__noinline__)) 265#define ecb_noinline ecb_attribute ((__noinline__))
199#define ecb_noreturn ecb_attribute ((__noreturn__))
200#define ecb_unused ecb_attribute ((__unused__)) 266#define ecb_unused ecb_attribute ((__unused__))
201#define ecb_const ecb_attribute ((__const__)) 267#define ecb_const ecb_attribute ((__const__))
202#define ecb_pure ecb_attribute ((__pure__)) 268#define ecb_pure ecb_attribute ((__pure__))
269
270#if ECB_C11
271 #define ecb_noreturn _Noreturn
272#else
273 #define ecb_noreturn ecb_attribute ((__noreturn__))
274#endif
203 275
204#if ECB_GCC_VERSION(4,3) 276#if ECB_GCC_VERSION(4,3)
205 #define ecb_artificial ecb_attribute ((__artificial__)) 277 #define ecb_artificial ecb_attribute ((__artificial__))
206 #define ecb_hot ecb_attribute ((__hot__)) 278 #define ecb_hot ecb_attribute ((__hot__))
207 #define ecb_cold ecb_attribute ((__cold__)) 279 #define ecb_cold ecb_attribute ((__cold__))
… …
298 370
299 return r + ecb_ld32 (x); 371 return r + ecb_ld32 (x);
300 } 372 }
301#endif 373#endif
302 374
375ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
376ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
377ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
378ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
379
303ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const; 380ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
304ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) 381ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
305{ 382{
306 return ( (x * 0x0802U & 0x22110U) 383 return ( (x * 0x0802U & 0x22110U)
307 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; 384 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
… …
391 ecb_inline void ecb_unreachable (void) ecb_noreturn; 468 ecb_inline void ecb_unreachable (void) ecb_noreturn;
392 ecb_inline void ecb_unreachable (void) { } 469 ecb_inline void ecb_unreachable (void) { }
393#endif 470#endif
394 471
395/* try to tell the compiler that some condition is definitely true */ 472/* try to tell the compiler that some condition is definitely true */
396#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 473#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
397 474
398ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; 475ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
399ecb_inline unsigned char 476ecb_inline unsigned char
400ecb_byteorder_helper (void) 477ecb_byteorder_helper (void)
401{ 478{
402 const uint32_t u = 0x11223344; 479 /* the union code still generates code under pressure in gcc, */
403 return *(unsigned char *)&u; 480 /* but less than using pointers, and always seem to */
481 /* successfully return a constant. */
482 /* the reason why we have this horrible preprocessor mess */
483 /* is to avoid it in all cases, at least on common architectures */
484 /* and yes, gcc defines __BYTE_ORDER__, g++ does not */
485#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
486 return 0x44;
487#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
488 return 0x44;
489#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
490 retrurn 0x11;
491#else
492 union
493 {
494 uint32_t i;
495 uint8_t c;
496 } u = { 0x11223344 };
497 return u.c;
498#endif
404} 499}
405 500
406ecb_inline ecb_bool ecb_big_endian (void) ecb_const; 501ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
407ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } 502ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
408ecb_inline ecb_bool ecb_little_endian (void) ecb_const; 503ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
… …
439 } 534 }
440#else 535#else
441 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 536 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
442#endif 537#endif
443 538
539/*******************************************************************************/
540/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
541
542/* basically, everything uses "ieee pure-endian" floating point numbers */
543/* the only noteworthy exception is ancient armle, which uses order 43218765 */
544#if 0 \
545 || __i386 || __i386__ \
546 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
547 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
548 || defined __arm__ && defined __ARM_EABI__ \
549 || defined __s390__ || defined __s390x__ \
550 || defined __mips__ \
551 || defined __alpha__ \
552 || defined __hppa__ \
553 || defined __ia64__ \
554 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64
555 #define ECB_STDFP 1
556 #include <string.h> /* for memcpy */
557#else
558 #define ECB_STDFP 0
559#endif
560
561#ifndef ECB_NO_LIBM
562
563 #if __STDC_IEC_559__ || ECB_STDFP
564 /* we assume this is defined for most C and many C++ compilers */
565 ecb_inline ecb_bool ecb_float_ieee (void) ecb_const;
566 ecb_inline ecb_bool ecb_float_ieee (void) { return 1; }
567 ecb_inline ecb_bool ecb_double_ieee (void) ecb_const;
568 ecb_inline ecb_bool ecb_double_ieee (void) { return 1; }
569 #elif ECB_CPP
570 #include <limits>
571 ecb_inline ecb_bool ecb_float_ieee (void) ecb_const;
572 ecb_inline ecb_bool ecb_float_ieee (void) { return std::numeric_limits<float >::is_iec559; }
573 ecb_inline ecb_bool ecb_double_ieee (void) ecb_const;
574 ecb_inline ecb_bool ecb_double_ieee (void) { return std::numeric_limits<double>::is_iec559; }
575 #else
576 ecb_inline ecb_bool ecb_float_ieee (void) ecb_const;
577 ecb_inline ecb_bool ecb_float_ieee (void) { return 0; }
578 ecb_inline ecb_bool ecb_double_ieee (void) ecb_const;
579 ecb_inline ecb_bool ecb_double_ieee (void) { return 0; }
444#endif 580 #endif
445 581
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 nan's and -0 */
593 ECB_EXTERN_C float frexpf (float v, int *e);
594 uint32_t m;
595 int e;
596
597 if (x == 0e0f ) return 0;
598 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
599 if (x < -3.40282346638528860e+38f) return 0xff800000U;
600
601 m = frexpf (x, &e) * 0x1000000U;
602
603 r = m & 0x80000000U;
604
605 if (r)
606 m = -m;
607
608 if (e < -125)
609 {
610 m &= 0xffffffU;
611 m >>= (-125 - e);
612 e = -126;
613 }
614
615 r |= (e + 126) << 23;
616 r |= m & 0x7fffffU;
617 #endif
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 ECB_EXTERN_C float ldexpf (float x, int e);
634
635 int neg = x >> 31;
636 int e = (x >> 23) & 0xffU;
637
638 x &= 0x7fffffU;
639
640 if (e)
641 x |= 0x800000U;
642 else
643 e = 1;
644
645 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
646 r = ldexpf (x * (1.f / 0x1000000U), e - 126);
647
648 r = neg ? -r : r;
649 #endif
650
651 return r;
652 }
653
654 /* convert a double to ieee double/binary64 */
655 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
656 ecb_function_ uint64_t
657 ecb_double_to_binary64 (double x)
658 {
659 uint64_t r;
660
661 #if ECB_STDFP
662 memcpy (&r, &x, 8);
663 #else
664 /* slow emulation, works for anything but nan's and -0 */
665 ECB_EXTERN_C double frexp (double v, int *e);
666 uint64_t m;
667 int e;
668
669 if (x == 0e0 ) return 0;
670 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
671 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
672
673 m = frexpf (x, &e) * 0x1000000U;
674 m = frexp (x, &e) * 0x20000000000000U;
675
676 r = m & 0x8000000000000000;;
677
678 if (r)
679 m = -m;
680
681 if (e < -1021)
682 {
683 m &= 0x1fffffffffffffU;
684 m >>= (-1021 - e);
685 e = -1022;
686 }
687
688 r |= ((uint64_t)(e + 1022)) << 52;
689 r |= m & 0xfffffffffffffU;
690 #endif
691
692 return r;
693 }
694
695 /* converts an ieee double/binary64 to a double */
696 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
697 ecb_function_ double
698 ecb_binary64_to_double (uint64_t x)
699 {
700 double r;
701
702 #if ECB_STDFP
703 memcpy (&r, &x, 8);
704 #else
705 /* emulation, only works for normals and subnormals and +0 */
706 ECB_EXTERN_C double ldexp (double x, int e);
707
708 int neg = x >> 63;
709 int e = (x >> 52) & 0x7ffU;
710
711 x &= 0xfffffffffffffU;
712
713 if (e)
714 x |= 0x10000000000000U;
715 else
716 e = 1;
717
718 /* we distrust ldexpf a bit and do the 2**-53 scaling by an extra multiply */
719 r = ldexp (x * (1. / 0x20000000000000U), e - 1022);
720
721 r = neg ? -r : r;
722 #endif
723
724 return r;
725 }
726
727#endif
728
729#endif
730

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