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

Comparing libecb/ecb.h (file contents):
Revision 1.90 by root, Tue May 29 14:09:49 2012 UTC vs.
Revision 1.134 by root, Mon Jun 9 17:31:57 2014 UTC

1/* 1/*
2 * libecb - http://software.schmorp.de/pkg/libecb 2 * libecb - http://software.schmorp.de/pkg/libecb
3 * 3 *
4 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de> 4 * Copyright (©) 2009-2014 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta 5 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved. 6 * All rights reserved.
7 * 7 *
8 * Redistribution and use in source and binary forms, with or without modifica- 8 * Redistribution and use in source and binary forms, with or without modifica-
9 * tion, are permitted provided that the following conditions are met: 9 * tion, are permitted provided that the following conditions are met:
… …
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
26 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 26 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE. 27 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Alternatively, the contents of this file may be used under the terms of
30 * the GNU General Public License ("GPL") version 2 or any later version,
31 * in which case the provisions of the GPL are applicable instead of
32 * the above. If you wish to allow the use of your version of this file
33 * only under the terms of the GPL and not to allow others to use your
34 * version of this file under the BSD license, indicate your decision
35 * by deleting the provisions above and replace them with the notice
36 * and other provisions required by the GPL. If you do not delete the
37 * provisions above, a recipient may use your version of this file under
38 * either the BSD or the GPL.
28 */ 39 */
29 40
30#ifndef ECB_H 41#ifndef ECB_H
31#define ECB_H 42#define ECB_H
32 43
33/* 16 bits major, 16 bits minor */ 44/* 16 bits major, 16 bits minor */
34#define ECB_VERSION 0x00010001 45#define ECB_VERSION 0x00010003
35 46
36#ifdef _WIN32 47#ifdef _WIN32
37 typedef signed char int8_t; 48 typedef signed char int8_t;
38 typedef unsigned char uint8_t; 49 typedef unsigned char uint8_t;
39 typedef signed short int16_t; 50 typedef signed short int16_t;
… …
54 #else 65 #else
55 #define ECB_PTRSIZE 4 66 #define ECB_PTRSIZE 4
56 typedef uint32_t uintptr_t; 67 typedef uint32_t uintptr_t;
57 typedef int32_t intptr_t; 68 typedef int32_t intptr_t;
58 #endif 69 #endif
59 typedef intptr_t ptrdiff_t;
60#else 70#else
61 #include <inttypes.h> 71 #include <inttypes.h>
62 #if UINTMAX_MAX > 0xffffffffU 72 #if UINTMAX_MAX > 0xffffffffU
63 #define ECB_PTRSIZE 8 73 #define ECB_PTRSIZE 8
64 #else 74 #else
65 #define ECB_PTRSIZE 4 75 #define ECB_PTRSIZE 4
76 #endif
77#endif
78
79/* work around x32 idiocy by defining proper macros */
80#if __amd64 || __x86_64 || _M_AMD64 || _M_X64
81 #if _ILP32
82 #define ECB_AMD64_X32 1
83 #else
84 #define ECB_AMD64 1
66 #endif 85 #endif
67#endif 86#endif
68 87
69/* many compilers define _GNUC_ to some versions but then only implement 88/* many compilers define _GNUC_ to some versions but then only implement
70 * what their idiot authors think are the "more important" extensions, 89 * what their idiot authors think are the "more important" extensions,
… …
79 #else 98 #else
80 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 99 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
81 #endif 100 #endif
82#endif 101#endif
83 102
103#define ECB_CPP (__cplusplus+0)
104#define ECB_CPP11 (__cplusplus >= 201103L)
105
106#if ECB_CPP
107 #define ECB_C 0
108 #define ECB_STDC_VERSION 0
109#else
110 #define ECB_C 1
111 #define ECB_STDC_VERSION __STDC_VERSION__
112#endif
113
84#define ECB_C99 (__STDC_VERSION__ >= 199901L) 114#define ECB_C99 (ECB_STDC_VERSION >= 199901L)
85#define ECB_C11 (__STDC_VERSION__ >= 201112L) 115#define ECB_C11 (ECB_STDC_VERSION >= 201112L)
116
117#if ECB_CPP
118 #define ECB_EXTERN_C extern "C"
119 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
120 #define ECB_EXTERN_C_END }
121#else
122 #define ECB_EXTERN_C extern
123 #define ECB_EXTERN_C_BEG
124 #define ECB_EXTERN_C_END
125#endif
86 126
87/*****************************************************************************/ 127/*****************************************************************************/
88 128
89/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ 129/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
90/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ 130/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
91 131
92#if ECB_NO_THREADS 132#if ECB_NO_THREADS
93# define ECB_NO_SMP 1 133 #define ECB_NO_SMP 1
94#endif 134#endif
95 135
96#if ECB_NO_THREADS || ECB_NO_SMP 136#if ECB_NO_SMP
97 #define ECB_MEMORY_FENCE do { } while (0) 137 #define ECB_MEMORY_FENCE do { } while (0)
98#endif
99
100#ifndef ECB_MEMORY_FENCE
101 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
102 /* we assume that these memory fences work on all variables/all memory accesses, */
103 /* not just C11 atomics and atomic accesses */
104 #include <stdatomic.h>
105 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_acq_rel)
106 #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
107 #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
108 #endif
109#endif 138#endif
110 139
111#ifndef ECB_MEMORY_FENCE 140#ifndef ECB_MEMORY_FENCE
112 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 141 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
113 #if __i386 || __i386__ 142 #if __i386 || __i386__
114 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 143 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
115 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ 144 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
116 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ 145 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
117 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ 146 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
118 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 147 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
119 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 148 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
120 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ 149 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
121 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ 150 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
122 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 151 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
123 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ 152 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
124 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ 153 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
125 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") 154 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
126 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ 155 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
127 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ 156 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
128 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") 157 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
158 #elif __aarch64__
159 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
129 #elif __sparc || __sparc__ 160 #elif (__sparc || __sparc__) && !__sparcv8
130 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory") 161 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
131 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") 162 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
132 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") 163 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
133 #elif defined __s390__ || defined __s390x__ 164 #elif defined __s390__ || defined __s390x__
134 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") 165 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
135 #elif defined __mips__ 166 #elif defined __mips__
167 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
168 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
136 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 169 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
137 #elif defined __alpha__ 170 #elif defined __alpha__
138 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") 171 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
172 #elif defined __hppa__
173 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
174 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
175 #elif defined __ia64__
176 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
177 #elif defined __m68k__
178 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
179 #elif defined __m88k__
180 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
181 #elif defined __sh__
182 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
139 #endif 183 #endif
140 #endif 184 #endif
141#endif 185#endif
142 186
143#ifndef ECB_MEMORY_FENCE 187#ifndef ECB_MEMORY_FENCE
188 #if ECB_GCC_VERSION(4,7)
189 /* see comment below (stdatomic.h) about the C11 memory model. */
190 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
191 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
192 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
193
194 /* The __has_feature syntax from clang is so misdesigned that we cannot use it
195 * without risking compile time errors with other compilers. We *could*
196 * define our own ecb_clang_has_feature, but I just can't be bothered to work
197 * around this shit time and again.
198 * #elif defined __clang && __has_feature (cxx_atomic)
199 * // see comment below (stdatomic.h) about the C11 memory model.
200 * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
201 * #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
202 * #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
203 */
204
144 #if ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 205 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
145 #define ECB_MEMORY_FENCE __sync_synchronize () 206 #define ECB_MEMORY_FENCE __sync_synchronize ()
146 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */ 207 #elif _MSC_VER >= 1500 /* VC++ 2008 */
147 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */ 208 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
209 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
210 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
211 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
212 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
148 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 213 #elif _MSC_VER >= 1400 /* VC++ 2005 */
149 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 214 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
150 #define ECB_MEMORY_FENCE _ReadWriteBarrier () 215 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
151 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ 216 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
152 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () 217 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
… …
162 #define ECB_MEMORY_FENCE __sync () 227 #define ECB_MEMORY_FENCE __sync ()
163 #endif 228 #endif
164#endif 229#endif
165 230
166#ifndef ECB_MEMORY_FENCE 231#ifndef ECB_MEMORY_FENCE
232 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
233 /* we assume that these memory fences work on all variables/all memory accesses, */
234 /* not just C11 atomics and atomic accesses */
235 #include <stdatomic.h>
236 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
237 /* any fence other than seq_cst, which isn't very efficient for us. */
238 /* Why that is, we don't know - either the C11 memory model is quite useless */
239 /* for most usages, or gcc and clang have a bug */
240 /* I *currently* lean towards the latter, and inefficiently implement */
241 /* all three of ecb's fences as a seq_cst fence */
242 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
243 /* for all __atomic_thread_fence's except seq_cst */
244 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
245 #endif
246#endif
247
248#ifndef ECB_MEMORY_FENCE
167 #if !ECB_AVOID_PTHREADS 249 #if !ECB_AVOID_PTHREADS
168 /* 250 /*
169 * if you get undefined symbol references to pthread_mutex_lock, 251 * if you get undefined symbol references to pthread_mutex_lock,
170 * or failure to find pthread.h, then you should implement 252 * or failure to find pthread.h, then you should implement
171 * the ECB_MEMORY_FENCE operations for your cpu/compiler 253 * the ECB_MEMORY_FENCE operations for your cpu/compiler
… …
223 #define ecb_is_constant(expr) __builtin_constant_p (expr) 305 #define ecb_is_constant(expr) __builtin_constant_p (expr)
224 #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 306 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
225 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 307 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
226#else 308#else
227 #define ecb_attribute(attrlist) 309 #define ecb_attribute(attrlist)
310
311 /* possible C11 impl for integral types
312 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
313 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
314
228 #define ecb_is_constant(expr) 0 315 #define ecb_is_constant(expr) 0
229 #define ecb_expect(expr,value) (expr) 316 #define ecb_expect(expr,value) (expr)
230 #define ecb_prefetch(addr,rw,locality) 317 #define ecb_prefetch(addr,rw,locality)
231#endif 318#endif
232 319
… …
235 #define ecb_decltype(x) __decltype(x) 322 #define ecb_decltype(x) __decltype(x)
236#elif ECB_GCC_VERSION(3,0) 323#elif ECB_GCC_VERSION(3,0)
237 #define ecb_decltype(x) __typeof(x) 324 #define ecb_decltype(x) __typeof(x)
238#endif 325#endif
239 326
327#define ecb_deprecated ecb_attribute ((__deprecated__))
240#define ecb_noinline ecb_attribute ((__noinline__)) 328#define ecb_noinline ecb_attribute ((__noinline__))
241#define ecb_unused ecb_attribute ((__unused__)) 329#define ecb_unused ecb_attribute ((__unused__))
242#define ecb_const ecb_attribute ((__const__)) 330#define ecb_const ecb_attribute ((__const__))
243#define ecb_pure ecb_attribute ((__pure__)) 331#define ecb_pure ecb_attribute ((__pure__))
244 332
… …
443 ecb_inline void ecb_unreachable (void) ecb_noreturn; 531 ecb_inline void ecb_unreachable (void) ecb_noreturn;
444 ecb_inline void ecb_unreachable (void) { } 532 ecb_inline void ecb_unreachable (void) { }
445#endif 533#endif
446 534
447/* try to tell the compiler that some condition is definitely true */ 535/* try to tell the compiler that some condition is definitely true */
448#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 536#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
449 537
450ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; 538ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
451ecb_inline unsigned char 539ecb_inline unsigned char
452ecb_byteorder_helper (void) 540ecb_byteorder_helper (void)
453{ 541{
454 const uint32_t u = 0x11223344; 542 /* the union code still generates code under pressure in gcc, */
455 return *(unsigned char *)&u; 543 /* but less than using pointers, and always seems to */
544 /* successfully return a constant. */
545 /* the reason why we have this horrible preprocessor mess */
546 /* is to avoid it in all cases, at least on common architectures */
547 /* or when using a recent enough gcc version (>= 4.6) */
548#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64
549 return 0x44;
550#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
551 return 0x44;
552#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
553 return 0x11;
554#else
555 union
556 {
557 uint32_t i;
558 uint8_t c;
559 } u = { 0x11223344 };
560 return u.c;
561#endif
456} 562}
457 563
458ecb_inline ecb_bool ecb_big_endian (void) ecb_const; 564ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
459ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } 565ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
460ecb_inline ecb_bool ecb_little_endian (void) ecb_const; 566ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
… …
491 } 597 }
492#else 598#else
493 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 599 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
494#endif 600#endif
495 601
602/*******************************************************************************/
603/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
604
605/* basically, everything uses "ieee pure-endian" floating point numbers */
606/* the only noteworthy exception is ancient armle, which uses order 43218765 */
607#if 0 \
608 || __i386 || __i386__ \
609 || __amd64 || __amd64__ || __x86_64 || __x86_64__ \
610 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
611 || defined __s390__ || defined __s390x__ \
612 || defined __mips__ \
613 || defined __alpha__ \
614 || defined __hppa__ \
615 || defined __ia64__ \
616 || defined __m68k__ \
617 || defined __m88k__ \
618 || defined __sh__ \
619 || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \
620 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
621 || defined __aarch64__
622 #define ECB_STDFP 1
623 #include <string.h> /* for memcpy */
624#else
625 #define ECB_STDFP 0
626#endif
627
628#ifndef ECB_NO_LIBM
629
630 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
631
632 /* only the oldest of old doesn't have this one. solaris. */
633 #ifdef INFINITY
634 #define ECB_INFINITY INFINITY
635 #else
636 #define ECB_INFINITY HUGE_VAL
496#endif 637 #endif
497 638
639 #ifdef NAN
640 #define ECB_NAN NAN
641 #else
642 #define ECB_NAN ECB_INFINITY
643 #endif
644
645 /* converts an ieee half/binary16 to a float */
646 ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const;
647 ecb_function_ float
648 ecb_binary16_to_float (uint16_t x)
649 {
650 int e = (x >> 10) & 0x1f;
651 int m = x & 0x3ff;
652 float r;
653
654 if (!e ) r = ldexpf (m , -24);
655 else if (e != 31) r = ldexpf (m + 0x400, e - 25);
656 else if (m ) r = ECB_NAN;
657 else r = ECB_INFINITY;
658
659 return x & 0x8000 ? -r : r;
660 }
661
662 /* convert a float to ieee single/binary32 */
663 ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const;
664 ecb_function_ uint32_t
665 ecb_float_to_binary32 (float x)
666 {
667 uint32_t r;
668
669 #if ECB_STDFP
670 memcpy (&r, &x, 4);
671 #else
672 /* slow emulation, works for anything but -0 */
673 uint32_t m;
674 int e;
675
676 if (x == 0e0f ) return 0x00000000U;
677 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
678 if (x < -3.40282346638528860e+38f) return 0xff800000U;
679 if (x != x ) return 0x7fbfffffU;
680
681 m = frexpf (x, &e) * 0x1000000U;
682
683 r = m & 0x80000000U;
684
685 if (r)
686 m = -m;
687
688 if (e <= -126)
689 {
690 m &= 0xffffffU;
691 m >>= (-125 - e);
692 e = -126;
693 }
694
695 r |= (e + 126) << 23;
696 r |= m & 0x7fffffU;
697 #endif
698
699 return r;
700 }
701
702 /* converts an ieee single/binary32 to a float */
703 ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const;
704 ecb_function_ float
705 ecb_binary32_to_float (uint32_t x)
706 {
707 float r;
708
709 #if ECB_STDFP
710 memcpy (&r, &x, 4);
711 #else
712 /* emulation, only works for normals and subnormals and +0 */
713 int neg = x >> 31;
714 int e = (x >> 23) & 0xffU;
715
716 x &= 0x7fffffU;
717
718 if (e)
719 x |= 0x800000U;
720 else
721 e = 1;
722
723 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
724 r = ldexpf (x * (0.5f / 0x800000U), e - 126);
725
726 r = neg ? -r : r;
727 #endif
728
729 return r;
730 }
731
732 /* convert a double to ieee double/binary64 */
733 ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const;
734 ecb_function_ uint64_t
735 ecb_double_to_binary64 (double x)
736 {
737 uint64_t r;
738
739 #if ECB_STDFP
740 memcpy (&r, &x, 8);
741 #else
742 /* slow emulation, works for anything but -0 */
743 uint64_t m;
744 int e;
745
746 if (x == 0e0 ) return 0x0000000000000000U;
747 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
748 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
749 if (x != x ) return 0X7ff7ffffffffffffU;
750
751 m = frexp (x, &e) * 0x20000000000000U;
752
753 r = m & 0x8000000000000000;;
754
755 if (r)
756 m = -m;
757
758 if (e <= -1022)
759 {
760 m &= 0x1fffffffffffffU;
761 m >>= (-1021 - e);
762 e = -1022;
763 }
764
765 r |= ((uint64_t)(e + 1022)) << 52;
766 r |= m & 0xfffffffffffffU;
767 #endif
768
769 return r;
770 }
771
772 /* converts an ieee double/binary64 to a double */
773 ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const;
774 ecb_function_ double
775 ecb_binary64_to_double (uint64_t x)
776 {
777 double r;
778
779 #if ECB_STDFP
780 memcpy (&r, &x, 8);
781 #else
782 /* emulation, only works for normals and subnormals and +0 */
783 int neg = x >> 63;
784 int e = (x >> 52) & 0x7ffU;
785
786 x &= 0xfffffffffffffU;
787
788 if (e)
789 x |= 0x10000000000000U;
790 else
791 e = 1;
792
793 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
794 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
795
796 r = neg ? -r : r;
797 #endif
798
799 return r;
800 }
801
802#endif
803
804#endif
805

Diff Legend

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