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: |
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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. |
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28 | * |
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29 | * Alternatively, the contents of this file may be used under the terms of |
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30 | * the GNU General Public License ("GPL") version 2 or any later version, |
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31 | * in which case the provisions of the GPL are applicable instead of |
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32 | * the above. If you wish to allow the use of your version of this file |
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33 | * only under the terms of the GPL and not to allow others to use your |
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34 | * version of this file under the BSD license, indicate your decision |
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35 | * by deleting the provisions above and replace them with the notice |
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36 | * and other provisions required by the GPL. If you do not delete the |
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37 | * provisions above, a recipient may use your version of this file under |
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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; |
… | |
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63 | #else |
74 | #else |
64 | #define ECB_PTRSIZE 4 |
75 | #define ECB_PTRSIZE 4 |
65 | #endif |
76 | #endif |
66 | #endif |
77 | #endif |
67 | |
78 | |
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79 | /* work around x32 idiocy by defining proper macros */ |
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80 | #if __amd64 || __x86_64 || _M_AMD64 || _M_X64 |
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81 | #if _ILP32 |
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82 | #define ECB_AMD64_X32 1 |
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83 | #else |
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84 | #define ECB_AMD64 1 |
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85 | #endif |
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86 | #endif |
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87 | |
68 | /* many compilers define _GNUC_ to some versions but then only implement |
88 | /* many compilers define _GNUC_ to some versions but then only implement |
69 | * what their idiot authors think are the "more important" extensions, |
89 | * what their idiot authors think are the "more important" extensions, |
70 | * causing enormous grief in return for some better fake benchmark numbers. |
90 | * causing enormous grief in return for some better fake benchmark numbers. |
71 | * or so. |
91 | * or so. |
72 | * we try to detect these and simply assume they are not gcc - if they have |
92 | * we try to detect these and simply assume they are not gcc - if they have |
73 | * an issue with that they should have done it right in the first place. |
93 | * an issue with that they should have done it right in the first place. |
74 | */ |
94 | */ |
75 | #ifndef ECB_GCC_VERSION |
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76 | #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__ |
95 | #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__ |
77 | #define ECB_GCC_VERSION(major,minor) 0 |
96 | #define ECB_GCC_VERSION(major,minor) 0 |
78 | #else |
97 | #else |
79 | #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
98 | #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
80 | #endif |
99 | #endif |
81 | #endif |
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82 | |
100 | |
83 | #define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */ |
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84 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
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85 | #define ECB_C11 (__STDC_VERSION__ >= 201112L) |
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86 | #define ECB_CPP (__cplusplus+0) |
101 | #define ECB_CPP (__cplusplus+0) |
87 | #define ECB_CPP11 (__cplusplus >= 201103L) |
102 | #define ECB_CPP11 (__cplusplus >= 201103L) |
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103 | |
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104 | #if ECB_CPP |
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105 | #define ECB_C 0 |
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106 | #define ECB_STDC_VERSION 0 |
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107 | #else |
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108 | #define ECB_C 1 |
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109 | #define ECB_STDC_VERSION __STDC_VERSION__ |
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110 | #endif |
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111 | |
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112 | #define ECB_C99 (ECB_STDC_VERSION >= 199901L) |
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113 | #define ECB_C11 (ECB_STDC_VERSION >= 201112L) |
88 | |
114 | |
89 | #if ECB_CPP |
115 | #if ECB_CPP |
90 | #define ECB_EXTERN_C extern "C" |
116 | #define ECB_EXTERN_C extern "C" |
91 | #define ECB_EXTERN_C_BEG ECB_EXTERN_C { |
117 | #define ECB_EXTERN_C_BEG ECB_EXTERN_C { |
92 | #define ECB_EXTERN_C_END } |
118 | #define ECB_EXTERN_C_END } |
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125 | || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ |
151 | || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ |
126 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
152 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
127 | #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ |
153 | #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ |
128 | || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ |
154 | || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ |
129 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
155 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
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156 | #elif __aarch64__ |
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157 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory") |
130 | #elif __sparc || __sparc__ |
158 | #elif (__sparc || __sparc__) && !__sparcv8 |
131 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") |
159 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") |
132 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") |
160 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") |
133 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") |
161 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") |
134 | #elif defined __s390__ || defined __s390x__ |
162 | #elif defined __s390__ || defined __s390x__ |
135 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") |
163 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") |
136 | #elif defined __mips__ |
164 | #elif defined __mips__ |
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165 | /* GNU/Linux emulates sync on mips1 architectures, so we force its use */ |
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166 | /* 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") |
167 | #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory") |
138 | #elif defined __alpha__ |
168 | #elif defined __alpha__ |
139 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") |
169 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") |
140 | #elif defined __hppa__ |
170 | #elif defined __hppa__ |
141 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
171 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
142 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
172 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
143 | #elif defined __ia64__ |
173 | #elif defined __ia64__ |
144 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory") |
174 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory") |
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175 | #elif defined __m68k__ |
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176 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
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177 | #elif defined __m88k__ |
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178 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory") |
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179 | #elif defined __sh__ |
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180 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
145 | #endif |
181 | #endif |
146 | #endif |
182 | #endif |
147 | #endif |
183 | #endif |
148 | |
184 | |
149 | #ifndef ECB_MEMORY_FENCE |
185 | #ifndef ECB_MEMORY_FENCE |
150 | #if ECB_GCC_VERSION(4,7) |
186 | #if ECB_GCC_VERSION(4,7) |
151 | /* see comment below (stdatomic.h) about the C11 memory model. */ |
187 | /* see comment below (stdatomic.h) about the C11 memory model. */ |
152 | #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) |
188 | #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) |
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189 | #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE) |
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190 | #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE) |
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191 | |
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192 | /* The __has_feature syntax from clang is so misdesigned that we cannot use it |
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193 | * without risking compile time errors with other compilers. We *could* |
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194 | * define our own ecb_clang_has_feature, but I just can't be bothered to work |
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195 | * around this shit time and again. |
153 | /*#elif defined __clang && __has_feature (cxx_atomic)*/ |
196 | * #elif defined __clang && __has_feature (cxx_atomic) |
154 | /* see comment below (stdatomic.h) about the C11 memory model. */ |
197 | * // see comment below (stdatomic.h) about the C11 memory model. |
155 | /*#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)*/ |
198 | * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) |
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199 | * #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE) |
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200 | * #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE) |
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201 | */ |
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202 | |
156 | #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ |
203 | #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ |
157 | #define ECB_MEMORY_FENCE __sync_synchronize () |
204 | #define ECB_MEMORY_FENCE __sync_synchronize () |
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205 | #elif _MSC_VER >= 1500 /* VC++ 2008 */ |
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206 | /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */ |
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207 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
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208 | #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier() |
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209 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */ |
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210 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier() |
158 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
211 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
159 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
212 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
160 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
213 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
161 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
214 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
162 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
215 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
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182 | /* any fence other than seq_cst, which isn't very efficient for us. */ |
235 | /* 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 */ |
236 | /* 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 */ |
237 | /* for most usages, or gcc and clang have a bug */ |
185 | /* I *currently* lean towards the latter, and inefficiently implement */ |
238 | /* I *currently* lean towards the latter, and inefficiently implement */ |
186 | /* all three of ecb's fences as a seq_cst fence */ |
239 | /* all three of ecb's fences as a seq_cst fence */ |
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240 | /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */ |
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241 | /* for all __atomic_thread_fence's except seq_cst */ |
187 | #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) |
242 | #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) |
188 | #endif |
243 | #endif |
189 | #endif |
244 | #endif |
190 | |
245 | |
191 | #ifndef ECB_MEMORY_FENCE |
246 | #ifndef ECB_MEMORY_FENCE |
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248 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
303 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
249 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
304 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
250 | #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
305 | #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
251 | #else |
306 | #else |
252 | #define ecb_attribute(attrlist) |
307 | #define ecb_attribute(attrlist) |
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308 | |
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309 | /* possible C11 impl for integral types |
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310 | typedef struct ecb_is_constant_struct ecb_is_constant_struct; |
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311 | #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */ |
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312 | |
253 | #define ecb_is_constant(expr) 0 |
313 | #define ecb_is_constant(expr) 0 |
254 | #define ecb_expect(expr,value) (expr) |
314 | #define ecb_expect(expr,value) (expr) |
255 | #define ecb_prefetch(addr,rw,locality) |
315 | #define ecb_prefetch(addr,rw,locality) |
256 | #endif |
316 | #endif |
257 | |
317 | |
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260 | #define ecb_decltype(x) __decltype(x) |
320 | #define ecb_decltype(x) __decltype(x) |
261 | #elif ECB_GCC_VERSION(3,0) |
321 | #elif ECB_GCC_VERSION(3,0) |
262 | #define ecb_decltype(x) __typeof(x) |
322 | #define ecb_decltype(x) __typeof(x) |
263 | #endif |
323 | #endif |
264 | |
324 | |
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325 | #if _MSC_VER >= 1300 |
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326 | #define ecb_deprecated __declspec(deprecated) |
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327 | #else |
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328 | #define ecb_deprecated ecb_attribute ((__deprecated__)) |
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329 | #endif |
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330 | |
265 | #define ecb_noinline ecb_attribute ((__noinline__)) |
331 | #define ecb_noinline ecb_attribute ((__noinline__)) |
266 | #define ecb_unused ecb_attribute ((__unused__)) |
332 | #define ecb_unused ecb_attribute ((__unused__)) |
267 | #define ecb_const ecb_attribute ((__const__)) |
333 | #define ecb_const ecb_attribute ((__const__)) |
268 | #define ecb_pure ecb_attribute ((__pure__)) |
334 | #define ecb_pure ecb_attribute ((__pure__)) |
269 | |
335 | |
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336 | /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx __declspec(noreturn) */ |
270 | #if ECB_C11 |
337 | #if ECB_C11 |
271 | #define ecb_noreturn _Noreturn |
338 | #define ecb_noreturn _Noreturn |
272 | #else |
339 | #else |
273 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
340 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
274 | #endif |
341 | #endif |
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475 | ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; |
542 | ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; |
476 | ecb_inline unsigned char |
543 | ecb_inline unsigned char |
477 | ecb_byteorder_helper (void) |
544 | ecb_byteorder_helper (void) |
478 | { |
545 | { |
479 | /* the union code still generates code under pressure in gcc, */ |
546 | /* the union code still generates code under pressure in gcc, */ |
480 | /* but less than using pointers, and always seem to */ |
547 | /* but less than using pointers, and always seems to */ |
481 | /* successfully return a constant. */ |
548 | /* successfully return a constant. */ |
482 | /* the reason why we have this horrible preprocessor mess */ |
549 | /* the reason why we have this horrible preprocessor mess */ |
483 | /* is to avoid it in all cases, at least on common architectures */ |
550 | /* is to avoid it in all cases, at least on common architectures */ |
484 | /* and yes, gcc defines __BYTE_ORDER__, g++ does not */ |
551 | /* or when using a recent enough gcc version (>= 4.6) */ |
485 | #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64 |
552 | #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64 |
486 | return 0x44; |
553 | return 0x44; |
487 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
554 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
488 | return 0x44; |
555 | return 0x44; |
489 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
556 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
490 | retrurn 0x11; |
557 | return 0x11; |
491 | #else |
558 | #else |
492 | union |
559 | union |
493 | { |
560 | { |
494 | uint32_t i; |
561 | uint32_t i; |
495 | uint8_t c; |
562 | uint8_t c; |
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543 | /* the only noteworthy exception is ancient armle, which uses order 43218765 */ |
610 | /* the only noteworthy exception is ancient armle, which uses order 43218765 */ |
544 | #if 0 \ |
611 | #if 0 \ |
545 | || __i386 || __i386__ \ |
612 | || __i386 || __i386__ \ |
546 | || __amd64 || __amd64__ || __x86_64 || __x86_64__ \ |
613 | || __amd64 || __amd64__ || __x86_64 || __x86_64__ \ |
547 | || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \ |
614 | || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \ |
548 | || defined __arm__ && defined __ARM_EABI__ \ |
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549 | || defined __s390__ || defined __s390x__ \ |
615 | || defined __s390__ || defined __s390x__ \ |
550 | || defined __mips__ \ |
616 | || defined __mips__ \ |
551 | || defined __alpha__ \ |
617 | || defined __alpha__ \ |
552 | || defined __hppa__ \ |
618 | || defined __hppa__ \ |
553 | || defined __ia64__ \ |
619 | || defined __ia64__ \ |
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620 | || defined __m68k__ \ |
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621 | || defined __m88k__ \ |
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622 | || defined __sh__ \ |
554 | || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 |
623 | || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \ |
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624 | || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \ |
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625 | || defined __aarch64__ |
555 | #define ECB_STDFP 1 |
626 | #define ECB_STDFP 1 |
556 | #include <string.h> /* for memcpy */ |
627 | #include <string.h> /* for memcpy */ |
557 | #else |
628 | #else |
558 | #define ECB_STDFP 0 |
629 | #define ECB_STDFP 0 |
559 | #endif |
630 | #endif |
560 | |
631 | |
561 | #ifndef ECB_NO_LIBM |
632 | #ifndef ECB_NO_LIBM |
562 | |
633 | |
563 | #if __STDC_IEC_559__ || ECB_STDFP |
634 | #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */ |
564 | /* we assume this is defined for most C and many C++ compilers */ |
635 | |
565 | ecb_inline ecb_bool ecb_float_ieee (void) ecb_const; |
636 | /* only the oldest of old doesn't have this one. solaris. */ |
566 | ecb_inline ecb_bool ecb_float_ieee (void) { return 1; } |
637 | #ifdef INFINITY |
567 | ecb_inline ecb_bool ecb_double_ieee (void) ecb_const; |
638 | #define ECB_INFINITY INFINITY |
568 | ecb_inline ecb_bool ecb_double_ieee (void) { return 1; } |
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569 | #elif ECB_CPP |
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570 | #include <limits> |
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571 | ecb_inline ecb_bool ecb_float_ieee (void) ecb_const; |
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572 | ecb_inline ecb_bool ecb_float_ieee (void) { return std::numeric_limits<float >::is_iec559; } |
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573 | ecb_inline ecb_bool ecb_double_ieee (void) ecb_const; |
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574 | ecb_inline ecb_bool ecb_double_ieee (void) { return std::numeric_limits<double>::is_iec559; } |
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575 | #else |
639 | #else |
576 | ecb_inline ecb_bool ecb_float_ieee (void) ecb_const; |
640 | #define ECB_INFINITY HUGE_VAL |
577 | ecb_inline ecb_bool ecb_float_ieee (void) { return 0; } |
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578 | ecb_inline ecb_bool ecb_double_ieee (void) ecb_const; |
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579 | ecb_inline ecb_bool ecb_double_ieee (void) { return 0; } |
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580 | #endif |
641 | #endif |
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642 | |
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643 | #ifdef NAN |
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644 | #define ECB_NAN NAN |
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645 | #else |
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646 | #define ECB_NAN ECB_INFINITY |
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647 | #endif |
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648 | |
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649 | /* converts an ieee half/binary16 to a float */ |
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650 | ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const; |
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651 | ecb_function_ float |
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652 | ecb_binary16_to_float (uint16_t x) |
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653 | { |
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654 | int e = (x >> 10) & 0x1f; |
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655 | int m = x & 0x3ff; |
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656 | float r; |
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657 | |
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658 | if (!e ) r = ldexpf (m , -24); |
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659 | else if (e != 31) r = ldexpf (m + 0x400, e - 25); |
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660 | else if (m ) r = ECB_NAN; |
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661 | else r = ECB_INFINITY; |
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662 | |
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663 | return x & 0x8000 ? -r : r; |
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664 | } |
581 | |
665 | |
582 | /* convert a float to ieee single/binary32 */ |
666 | /* convert a float to ieee single/binary32 */ |
583 | ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const; |
667 | ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const; |
584 | ecb_function_ uint32_t |
668 | ecb_function_ uint32_t |
585 | ecb_float_to_binary32 (float x) |
669 | ecb_float_to_binary32 (float x) |
… | |
… | |
588 | |
672 | |
589 | #if ECB_STDFP |
673 | #if ECB_STDFP |
590 | memcpy (&r, &x, 4); |
674 | memcpy (&r, &x, 4); |
591 | #else |
675 | #else |
592 | /* slow emulation, works for anything but -0 */ |
676 | /* slow emulation, works for anything but -0 */ |
593 | ECB_EXTERN_C float frexpf (float v, int *e); |
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594 | uint32_t m; |
677 | uint32_t m; |
595 | int e; |
678 | int e; |
596 | |
679 | |
597 | if (x == 0e0f ) return 0; |
680 | if (x == 0e0f ) return 0x00000000U; |
598 | if (x > +3.40282346638528860e+38f) return 0x7f800000U; |
681 | if (x > +3.40282346638528860e+38f) return 0x7f800000U; |
599 | if (x < -3.40282346638528860e+38f) return 0xff800000U; |
682 | if (x < -3.40282346638528860e+38f) return 0xff800000U; |
600 | if (x != x ) return 0x7fbfffffU; |
683 | if (x != x ) return 0x7fbfffffU; |
601 | |
684 | |
602 | m = frexpf (x, &e) * 0x1000000U; |
685 | m = frexpf (x, &e) * 0x1000000U; |
… | |
… | |
604 | r = m & 0x80000000U; |
687 | r = m & 0x80000000U; |
605 | |
688 | |
606 | if (r) |
689 | if (r) |
607 | m = -m; |
690 | m = -m; |
608 | |
691 | |
609 | if (e < -125) |
692 | if (e <= -126) |
610 | { |
693 | { |
611 | m &= 0xffffffU; |
694 | m &= 0xffffffU; |
612 | m >>= (-125 - e); |
695 | m >>= (-125 - e); |
613 | e = -126; |
696 | e = -126; |
614 | } |
697 | } |
… | |
… | |
629 | |
712 | |
630 | #if ECB_STDFP |
713 | #if ECB_STDFP |
631 | memcpy (&r, &x, 4); |
714 | memcpy (&r, &x, 4); |
632 | #else |
715 | #else |
633 | /* emulation, only works for normals and subnormals and +0 */ |
716 | /* emulation, only works for normals and subnormals and +0 */ |
634 | ECB_EXTERN_C float ldexpf (float x, int e); |
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635 | |
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636 | int neg = x >> 31; |
717 | int neg = x >> 31; |
637 | int e = (x >> 23) & 0xffU; |
718 | int e = (x >> 23) & 0xffU; |
638 | |
719 | |
639 | x &= 0x7fffffU; |
720 | x &= 0x7fffffU; |
640 | |
721 | |
… | |
… | |
642 | x |= 0x800000U; |
723 | x |= 0x800000U; |
643 | else |
724 | else |
644 | e = 1; |
725 | e = 1; |
645 | |
726 | |
646 | /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ |
727 | /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ |
647 | r = ldexpf (x * (1.f / 0x1000000U), e - 126); |
728 | r = ldexpf (x * (0.5f / 0x800000U), e - 126); |
648 | |
729 | |
649 | r = neg ? -r : r; |
730 | r = neg ? -r : r; |
650 | #endif |
731 | #endif |
651 | |
732 | |
652 | return r; |
733 | return r; |
… | |
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661 | |
742 | |
662 | #if ECB_STDFP |
743 | #if ECB_STDFP |
663 | memcpy (&r, &x, 8); |
744 | memcpy (&r, &x, 8); |
664 | #else |
745 | #else |
665 | /* slow emulation, works for anything but -0 */ |
746 | /* slow emulation, works for anything but -0 */ |
666 | ECB_EXTERN_C double frexp (double v, int *e); |
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667 | uint64_t m; |
747 | uint64_t m; |
668 | int e; |
748 | int e; |
669 | |
749 | |
670 | if (x == 0e0 ) return 0; |
750 | if (x == 0e0 ) return 0x0000000000000000U; |
671 | if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U; |
751 | if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U; |
672 | if (x < -1.79769313486231470e+308) return 0xfff0000000000000U; |
752 | if (x < -1.79769313486231470e+308) return 0xfff0000000000000U; |
673 | if (x != x ) return 0X7ff7ffffffffffffU; |
753 | if (x != x ) return 0X7ff7ffffffffffffU; |
674 | |
754 | |
675 | m = frexpf (x, &e) * 0x1000000U; |
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676 | m = frexp (x, &e) * 0x20000000000000U; |
755 | m = frexp (x, &e) * 0x20000000000000U; |
677 | |
756 | |
678 | r = m & 0x8000000000000000;; |
757 | r = m & 0x8000000000000000;; |
679 | |
758 | |
680 | if (r) |
759 | if (r) |
681 | m = -m; |
760 | m = -m; |
682 | |
761 | |
683 | if (e < -1021) |
762 | if (e <= -1022) |
684 | { |
763 | { |
685 | m &= 0x1fffffffffffffU; |
764 | m &= 0x1fffffffffffffU; |
686 | m >>= (-1021 - e); |
765 | m >>= (-1021 - e); |
687 | e = -1022; |
766 | e = -1022; |
688 | } |
767 | } |
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703 | |
782 | |
704 | #if ECB_STDFP |
783 | #if ECB_STDFP |
705 | memcpy (&r, &x, 8); |
784 | memcpy (&r, &x, 8); |
706 | #else |
785 | #else |
707 | /* emulation, only works for normals and subnormals and +0 */ |
786 | /* emulation, only works for normals and subnormals and +0 */ |
708 | ECB_EXTERN_C double ldexp (double x, int e); |
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709 | |
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710 | int neg = x >> 63; |
787 | int neg = x >> 63; |
711 | int e = (x >> 52) & 0x7ffU; |
788 | int e = (x >> 52) & 0x7ffU; |
712 | |
789 | |
713 | x &= 0xfffffffffffffU; |
790 | x &= 0xfffffffffffffU; |
714 | |
791 | |
715 | if (e) |
792 | if (e) |
716 | x |= 0x10000000000000U; |
793 | x |= 0x10000000000000U; |
717 | else |
794 | else |
718 | e = 1; |
795 | e = 1; |
719 | |
796 | |
720 | /* we distrust ldexpf a bit and do the 2**-53 scaling by an extra multiply */ |
797 | /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */ |
721 | r = ldexp (x * (1. / 0x20000000000000U), e - 1022); |
798 | r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022); |
722 | |
799 | |
723 | r = neg ? -r : r; |
800 | r = neg ? -r : r; |
724 | #endif |
801 | #endif |
725 | |
802 | |
726 | return r; |
803 | return r; |