| 1 | /* |
1 | /* |
| 2 | * libecb - http://software.schmorp.de/pkg/libecb |
2 | * libecb - http://software.schmorp.de/pkg/libecb |
| 3 | * |
3 | * |
| 4 | * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de> |
4 | * Copyright (©) 2009-2012 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: |
| … | |
… | |
| 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 0x00010003 |
|
|
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; |
| 38 | typedef signed int int32_t; |
41 | typedef signed int int32_t; |
| 39 | typedef unsigned int uint32_t; |
42 | typedef unsigned int uint32_t; |
| 40 | #if __GNUC__ |
43 | #if __GNUC__ |
| 41 | typedef signed long long int64_t; |
44 | typedef signed long long int64_t; |
| 42 | typedef unsigned long long uint64_t; |
45 | typedef unsigned long long uint64_t; |
| 43 | #else |
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 |
|
|
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 |
|
|
74 | #endif |
| 49 | #endif |
75 | #endif |
| 50 | |
76 | |
| 51 | /* many compilers define _GNUC_ to some versions but then only implement |
77 | /* many compilers define _GNUC_ to some versions but then only implement |
| 52 | * what their idiot authors think are the "more important" extensions, |
78 | * what their idiot authors think are the "more important" extensions, |
| 53 | * causing enourmous grief in return for some better fake benchmark numbers. |
79 | * causing enormous grief in return for some better fake benchmark numbers. |
| 54 | * or so. |
80 | * or so. |
| 55 | * we try to detect these and simply assume they are not gcc - if they have |
81 | * 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. |
82 | * an issue with that they should have done it right in the first place. |
| 57 | */ |
83 | */ |
| 58 | #ifndef ECB_GCC_VERSION |
84 | #ifndef ECB_GCC_VERSION |
| 59 | #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__) |
85 | #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 |
86 | #define ECB_GCC_VERSION(major,minor) 0 |
| 61 | #else |
87 | #else |
| 62 | #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
88 | #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
| 63 | #endif |
89 | #endif |
| 64 | #endif |
90 | #endif |
| 65 | |
91 | |
|
|
92 | #define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */ |
| 66 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
93 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
|
|
94 | #define ECB_C11 (__STDC_VERSION__ >= 201112L) |
|
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95 | #define ECB_CPP (__cplusplus+0) |
|
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96 | #define ECB_CPP11 (__cplusplus >= 201103L) |
|
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97 | |
|
|
98 | #if ECB_CPP |
|
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99 | #define ECB_EXTERN_C extern "C" |
|
|
100 | #define ECB_EXTERN_C_BEG ECB_EXTERN_C { |
|
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101 | #define ECB_EXTERN_C_END } |
|
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102 | #else |
|
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103 | #define ECB_EXTERN_C extern |
|
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104 | #define ECB_EXTERN_C_BEG |
|
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105 | #define ECB_EXTERN_C_END |
|
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106 | #endif |
|
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107 | |
|
|
108 | /*****************************************************************************/ |
|
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109 | |
|
|
110 | /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ |
|
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111 | /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ |
|
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112 | |
|
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113 | #if ECB_NO_THREADS |
|
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114 | #define ECB_NO_SMP 1 |
|
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115 | #endif |
|
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116 | |
|
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117 | #if ECB_NO_SMP |
|
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118 | #define ECB_MEMORY_FENCE do { } while (0) |
|
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119 | #endif |
|
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120 | |
|
|
121 | #ifndef ECB_MEMORY_FENCE |
|
|
122 | #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
|
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123 | #if __i386 || __i386__ |
|
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124 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") |
|
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125 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") |
|
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126 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
|
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127 | #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ |
|
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128 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
|
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129 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") |
|
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130 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
|
|
131 | #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ |
|
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132 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
|
|
133 | #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ |
|
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134 | || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ |
|
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135 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
|
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136 | #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ |
|
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137 | || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ |
|
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138 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
|
|
139 | #elif __sparc || __sparc__ |
|
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140 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") |
|
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141 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") |
|
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142 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") |
|
|
143 | #elif defined __s390__ || defined __s390x__ |
|
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144 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") |
|
|
145 | #elif defined __mips__ |
|
|
146 | /* GNU/Linux emulates sync on mips1 architectures, so we force its use */ |
|
|
147 | /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */ |
|
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148 | #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory") |
|
|
149 | #elif defined __alpha__ |
|
|
150 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") |
|
|
151 | #elif defined __hppa__ |
|
|
152 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
|
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153 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
|
|
154 | #elif defined __ia64__ |
|
|
155 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory") |
|
|
156 | #elif defined __m68k__ |
|
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157 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
|
|
158 | #elif defined __m88k__ |
|
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159 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory") |
|
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160 | #elif defined __sh__ |
|
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161 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
|
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162 | #endif |
|
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163 | #endif |
|
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164 | #endif |
|
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165 | |
|
|
166 | #ifndef ECB_MEMORY_FENCE |
|
|
167 | #if ECB_GCC_VERSION(4,7) |
|
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168 | /* see comment below (stdatomic.h) about the C11 memory model. */ |
|
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169 | #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) |
|
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170 | |
|
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171 | /* The __has_feature syntax from clang is so misdesigned that we cannot use it |
|
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172 | * without risking compile time errors with other compilers. We *could* |
|
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173 | * define our own ecb_clang_has_feature, but I just can't be bothered to work |
|
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174 | * around this shit time and again. |
|
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175 | * #elif defined __clang && __has_feature (cxx_atomic) |
|
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176 | * // see comment below (stdatomic.h) about the C11 memory model. |
|
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177 | * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) |
|
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178 | */ |
|
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179 | |
|
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180 | #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ |
|
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181 | #define ECB_MEMORY_FENCE __sync_synchronize () |
|
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182 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
|
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183 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
|
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184 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
|
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185 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
|
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186 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
|
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187 | #elif defined _WIN32 |
|
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188 | #include <WinNT.h> |
|
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189 | #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ |
|
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190 | #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
|
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191 | #include <mbarrier.h> |
|
|
192 | #define ECB_MEMORY_FENCE __machine_rw_barrier () |
|
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193 | #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier () |
|
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194 | #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier () |
|
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195 | #elif __xlC__ |
|
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196 | #define ECB_MEMORY_FENCE __sync () |
|
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197 | #endif |
|
|
198 | #endif |
|
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199 | |
|
|
200 | #ifndef ECB_MEMORY_FENCE |
|
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201 | #if ECB_C11 && !defined __STDC_NO_ATOMICS__ |
|
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202 | /* we assume that these memory fences work on all variables/all memory accesses, */ |
|
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203 | /* not just C11 atomics and atomic accesses */ |
|
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204 | #include <stdatomic.h> |
|
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205 | /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */ |
|
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206 | /* any fence other than seq_cst, which isn't very efficient for us. */ |
|
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207 | /* Why that is, we don't know - either the C11 memory model is quite useless */ |
|
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208 | /* for most usages, or gcc and clang have a bug */ |
|
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209 | /* I *currently* lean towards the latter, and inefficiently implement */ |
|
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210 | /* all three of ecb's fences as a seq_cst fence */ |
|
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211 | #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) |
|
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212 | #endif |
|
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213 | #endif |
|
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214 | |
|
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215 | #ifndef ECB_MEMORY_FENCE |
|
|
216 | #if !ECB_AVOID_PTHREADS |
|
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217 | /* |
|
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218 | * if you get undefined symbol references to pthread_mutex_lock, |
|
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219 | * or failure to find pthread.h, then you should implement |
|
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220 | * the ECB_MEMORY_FENCE operations for your cpu/compiler |
|
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221 | * OR provide pthread.h and link against the posix thread library |
|
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222 | * of your system. |
|
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223 | */ |
|
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224 | #include <pthread.h> |
|
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225 | #define ECB_NEEDS_PTHREADS 1 |
|
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226 | #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1 |
|
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227 | |
|
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228 | static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; |
|
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229 | #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) |
|
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230 | #endif |
|
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231 | #endif |
|
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232 | |
|
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233 | #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE |
|
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234 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
|
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235 | #endif |
|
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236 | |
|
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237 | #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE |
|
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238 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
|
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239 | #endif |
|
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240 | |
|
|
241 | /*****************************************************************************/ |
| 67 | |
242 | |
| 68 | #if __cplusplus |
243 | #if __cplusplus |
| 69 | #define ECB_INLINE static inline |
244 | #define ecb_inline static inline |
| 70 | #elif ECB_GCC_VERSION(2,5) |
245 | #elif ECB_GCC_VERSION(2,5) |
| 71 | #define ECB_INLINE static __inline__ |
246 | #define ecb_inline static __inline__ |
| 72 | #elif ECB_C99 |
247 | #elif ECB_C99 |
| 73 | #define ECB_INLINE static inline |
248 | #define ecb_inline static inline |
| 74 | #else |
249 | #else |
| 75 | #define ECB_INLINE static |
250 | #define ecb_inline static |
| 76 | #endif |
251 | #endif |
| 77 | |
252 | |
| 78 | #if ECB_GCC_VERSION(3,3) |
253 | #if ECB_GCC_VERSION(3,3) |
| 79 | #define ecb_restrict __restrict__ |
254 | #define ecb_restrict __restrict__ |
| 80 | #elif ECB_C99 |
255 | #elif ECB_C99 |
| … | |
… | |
| 88 | #define ECB_CONCAT_(a, b) a ## b |
263 | #define ECB_CONCAT_(a, b) a ## b |
| 89 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
264 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
| 90 | #define ECB_STRINGIFY_(a) # a |
265 | #define ECB_STRINGIFY_(a) # a |
| 91 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
266 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
| 92 | |
267 | |
| 93 | #define ecb_function_ ECB_INLINE |
268 | #define ecb_function_ ecb_inline |
| 94 | |
269 | |
| 95 | #if ECB_GCC_VERSION(3,1) |
270 | #if ECB_GCC_VERSION(3,1) |
| 96 | #define ecb_attribute(attrlist) __attribute__(attrlist) |
271 | #define ecb_attribute(attrlist) __attribute__(attrlist) |
| 97 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
272 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
| 98 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
273 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
| … | |
… | |
| 110 | #elif ECB_GCC_VERSION(3,0) |
285 | #elif ECB_GCC_VERSION(3,0) |
| 111 | #define ecb_decltype(x) __typeof(x) |
286 | #define ecb_decltype(x) __typeof(x) |
| 112 | #endif |
287 | #endif |
| 113 | |
288 | |
| 114 | #define ecb_noinline ecb_attribute ((__noinline__)) |
289 | #define ecb_noinline ecb_attribute ((__noinline__)) |
| 115 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
|
|
| 116 | #define ecb_unused ecb_attribute ((__unused__)) |
290 | #define ecb_unused ecb_attribute ((__unused__)) |
| 117 | #define ecb_const ecb_attribute ((__const__)) |
291 | #define ecb_const ecb_attribute ((__const__)) |
| 118 | #define ecb_pure ecb_attribute ((__pure__)) |
292 | #define ecb_pure ecb_attribute ((__pure__)) |
|
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293 | |
|
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294 | #if ECB_C11 |
|
|
295 | #define ecb_noreturn _Noreturn |
|
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296 | #else |
|
|
297 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
|
|
298 | #endif |
| 119 | |
299 | |
| 120 | #if ECB_GCC_VERSION(4,3) |
300 | #if ECB_GCC_VERSION(4,3) |
| 121 | #define ecb_artificial ecb_attribute ((__artificial__)) |
301 | #define ecb_artificial ecb_attribute ((__artificial__)) |
| 122 | #define ecb_hot ecb_attribute ((__hot__)) |
302 | #define ecb_hot ecb_attribute ((__hot__)) |
| 123 | #define ecb_cold ecb_attribute ((__cold__)) |
303 | #define ecb_cold ecb_attribute ((__cold__)) |
| … | |
… | |
| 136 | #define ecb_likely(expr) ecb_expect_true (expr) |
316 | #define ecb_likely(expr) ecb_expect_true (expr) |
| 137 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
317 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
| 138 | |
318 | |
| 139 | /* count trailing zero bits and count # of one bits */ |
319 | /* count trailing zero bits and count # of one bits */ |
| 140 | #if ECB_GCC_VERSION(3,4) |
320 | #if ECB_GCC_VERSION(3,4) |
|
|
321 | /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ |
|
|
322 | #define ecb_ld32(x) (__builtin_clz (x) ^ 31) |
|
|
323 | #define ecb_ld64(x) (__builtin_clzll (x) ^ 63) |
| 141 | #define ecb_ctz32(x) __builtin_ctz (x) |
324 | #define ecb_ctz32(x) __builtin_ctz (x) |
|
|
325 | #define ecb_ctz64(x) __builtin_ctzll (x) |
| 142 | #define ecb_popcount32(x) __builtin_popcount (x) |
326 | #define ecb_popcount32(x) __builtin_popcount (x) |
|
|
327 | /* no popcountll */ |
| 143 | #else |
328 | #else |
| 144 | ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
329 | ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
| 145 | ecb_function_ int |
330 | ecb_function_ int |
| 146 | ecb_ctz32 (uint32_t x) |
331 | ecb_ctz32 (uint32_t x) |
| 147 | { |
332 | { |
| 148 | int r = 0; |
333 | int r = 0; |
| 149 | |
334 | |
| 150 | x &= -x; /* this isolates the lowest bit */ |
335 | x &= ~x + 1; /* this isolates the lowest bit */ |
| 151 | |
336 | |
|
|
337 | #if ECB_branchless_on_i386 |
|
|
338 | r += !!(x & 0xaaaaaaaa) << 0; |
|
|
339 | r += !!(x & 0xcccccccc) << 1; |
|
|
340 | r += !!(x & 0xf0f0f0f0) << 2; |
|
|
341 | r += !!(x & 0xff00ff00) << 3; |
|
|
342 | r += !!(x & 0xffff0000) << 4; |
|
|
343 | #else |
| 152 | if (x & 0xaaaaaaaa) r += 1; |
344 | if (x & 0xaaaaaaaa) r += 1; |
| 153 | if (x & 0xcccccccc) r += 2; |
345 | if (x & 0xcccccccc) r += 2; |
| 154 | if (x & 0xf0f0f0f0) r += 4; |
346 | if (x & 0xf0f0f0f0) r += 4; |
| 155 | if (x & 0xff00ff00) r += 8; |
347 | if (x & 0xff00ff00) r += 8; |
| 156 | if (x & 0xffff0000) r += 16; |
348 | if (x & 0xffff0000) r += 16; |
|
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349 | #endif |
| 157 | |
350 | |
| 158 | return r; |
351 | return r; |
|
|
352 | } |
|
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353 | |
|
|
354 | ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const; |
|
|
355 | ecb_function_ int |
|
|
356 | ecb_ctz64 (uint64_t x) |
|
|
357 | { |
|
|
358 | int shift = x & 0xffffffffU ? 0 : 32; |
|
|
359 | return ecb_ctz32 (x >> shift) + shift; |
| 159 | } |
360 | } |
| 160 | |
361 | |
| 161 | ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
362 | ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
| 162 | ecb_function_ int |
363 | ecb_function_ int |
| 163 | ecb_popcount32 (uint32_t x) |
364 | ecb_popcount32 (uint32_t x) |
| … | |
… | |
| 167 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
368 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
| 168 | x *= 0x01010101; |
369 | x *= 0x01010101; |
| 169 | |
370 | |
| 170 | return x >> 24; |
371 | return x >> 24; |
| 171 | } |
372 | } |
|
|
373 | |
|
|
374 | ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
|
|
375 | ecb_function_ int ecb_ld32 (uint32_t x) |
|
|
376 | { |
|
|
377 | int r = 0; |
|
|
378 | |
|
|
379 | if (x >> 16) { x >>= 16; r += 16; } |
|
|
380 | if (x >> 8) { x >>= 8; r += 8; } |
|
|
381 | if (x >> 4) { x >>= 4; r += 4; } |
|
|
382 | if (x >> 2) { x >>= 2; r += 2; } |
|
|
383 | if (x >> 1) { r += 1; } |
|
|
384 | |
|
|
385 | return r; |
|
|
386 | } |
|
|
387 | |
|
|
388 | ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; |
|
|
389 | ecb_function_ int ecb_ld64 (uint64_t x) |
|
|
390 | { |
|
|
391 | int r = 0; |
|
|
392 | |
|
|
393 | if (x >> 32) { x >>= 32; r += 32; } |
|
|
394 | |
|
|
395 | return r + ecb_ld32 (x); |
|
|
396 | } |
| 172 | #endif |
397 | #endif |
|
|
398 | |
|
|
399 | ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const; |
|
|
400 | ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); } |
|
|
401 | ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const; |
|
|
402 | ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); } |
|
|
403 | |
|
|
404 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const; |
|
|
405 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) |
|
|
406 | { |
|
|
407 | return ( (x * 0x0802U & 0x22110U) |
|
|
408 | | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; |
|
|
409 | } |
|
|
410 | |
|
|
411 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const; |
|
|
412 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) |
|
|
413 | { |
|
|
414 | x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1); |
|
|
415 | x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2); |
|
|
416 | x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4); |
|
|
417 | x = ( x >> 8 ) | ( x << 8); |
|
|
418 | |
|
|
419 | return x; |
|
|
420 | } |
|
|
421 | |
|
|
422 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const; |
|
|
423 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) |
|
|
424 | { |
|
|
425 | x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1); |
|
|
426 | x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2); |
|
|
427 | x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4); |
|
|
428 | x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8); |
|
|
429 | x = ( x >> 16 ) | ( x << 16); |
|
|
430 | |
|
|
431 | return x; |
|
|
432 | } |
|
|
433 | |
|
|
434 | /* popcount64 is only available on 64 bit cpus as gcc builtin */ |
|
|
435 | /* so for this version we are lazy */ |
|
|
436 | ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; |
|
|
437 | ecb_function_ int |
|
|
438 | ecb_popcount64 (uint64_t x) |
|
|
439 | { |
|
|
440 | return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); |
|
|
441 | } |
|
|
442 | |
|
|
443 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const; |
|
|
444 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const; |
|
|
445 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const; |
|
|
446 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const; |
|
|
447 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
|
|
448 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
|
|
449 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const; |
|
|
450 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const; |
|
|
451 | |
|
|
452 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } |
|
|
453 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } |
|
|
454 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } |
|
|
455 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } |
|
|
456 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } |
|
|
457 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } |
|
|
458 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } |
|
|
459 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } |
| 173 | |
460 | |
| 174 | #if ECB_GCC_VERSION(4,3) |
461 | #if ECB_GCC_VERSION(4,3) |
| 175 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
|
|
| 176 | #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
462 | #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) |
|
|
463 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
|
|
464 | #define ecb_bswap64(x) __builtin_bswap64 (x) |
| 177 | #else |
465 | #else |
|
|
466 | ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; |
|
|
467 | ecb_function_ uint16_t |
|
|
468 | ecb_bswap16 (uint16_t x) |
|
|
469 | { |
|
|
470 | return ecb_rotl16 (x, 8); |
|
|
471 | } |
|
|
472 | |
| 178 | ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
473 | ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
| 179 | ecb_function_ uint32_t |
474 | ecb_function_ uint32_t |
| 180 | ecb_bswap32 (uint32_t x) |
475 | ecb_bswap32 (uint32_t x) |
| 181 | { |
476 | { |
| 182 | return (x >> 24) |
477 | return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); |
| 183 | | ((x >> 8) & 0x0000ff00) |
|
|
| 184 | | ((x << 8) & 0x00ff0000) |
|
|
| 185 | | (x << 24); |
|
|
| 186 | } |
478 | } |
| 187 | |
479 | |
| 188 | ecb_function_ uint32_t ecb_bswap16 (uint32_t x) ecb_const; |
480 | ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; |
| 189 | ecb_function_ uint32_t |
481 | ecb_function_ uint64_t |
| 190 | ecb_bswap16 (uint32_t x) |
482 | ecb_bswap64 (uint64_t x) |
| 191 | { |
483 | { |
| 192 | return ((x >> 8) & 0xff) |
484 | return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); |
| 193 | | ((x << 8) & 0x00ff0000) |
|
|
| 194 | | (x << 24); |
|
|
| 195 | } |
485 | } |
| 196 | #endif |
486 | #endif |
| 197 | |
487 | |
| 198 | #if ECB_GCC_VERSION(4,5) |
488 | #if ECB_GCC_VERSION(4,5) |
| 199 | #define ecb_unreachable() __builtin_unreachable () |
489 | #define ecb_unreachable() __builtin_unreachable () |
| 200 | #else |
490 | #else |
| 201 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
491 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
| 202 | ecb_function_ void ecb_unreachable (void) ecb_noreturn; |
492 | ecb_inline void ecb_unreachable (void) ecb_noreturn; |
| 203 | ecb_function_ void ecb_unreachable (void) { } |
493 | ecb_inline void ecb_unreachable (void) { } |
| 204 | #endif |
494 | #endif |
| 205 | |
495 | |
| 206 | /* try to tell the compiler that some condition is definitely true */ |
496 | /* try to tell the compiler that some condition is definitely true */ |
| 207 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
497 | #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0 |
| 208 | |
498 | |
| 209 | ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; |
499 | ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; |
| 210 | ecb_function_ unsigned char |
500 | ecb_inline unsigned char |
| 211 | ecb_byteorder_helper (void) |
501 | ecb_byteorder_helper (void) |
| 212 | { |
502 | { |
| 213 | const uint32_t u = 0x11223344; |
503 | /* the union code still generates code under pressure in gcc, */ |
| 214 | return *(unsigned char *)&u; |
504 | /* but less than using pointers, and always seems to */ |
|
|
505 | /* successfully return a constant. */ |
|
|
506 | /* the reason why we have this horrible preprocessor mess */ |
|
|
507 | /* is to avoid it in all cases, at least on common architectures */ |
|
|
508 | /* or when using a recent enough gcc version (>= 4.6) */ |
|
|
509 | #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64 |
|
|
510 | return 0x44; |
|
|
511 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
|
|
512 | return 0x44; |
|
|
513 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
|
|
514 | return 0x11; |
|
|
515 | #else |
|
|
516 | union |
|
|
517 | { |
|
|
518 | uint32_t i; |
|
|
519 | uint8_t c; |
|
|
520 | } u = { 0x11223344 }; |
|
|
521 | return u.c; |
|
|
522 | #endif |
| 215 | } |
523 | } |
| 216 | |
524 | |
| 217 | ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; |
525 | ecb_inline ecb_bool ecb_big_endian (void) ecb_const; |
| 218 | ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
526 | ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
| 219 | ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; |
527 | ecb_inline ecb_bool ecb_little_endian (void) ecb_const; |
| 220 | ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
528 | ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
| 221 | |
529 | |
| 222 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
530 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
| 223 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
531 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
| 224 | #else |
532 | #else |
| 225 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
533 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
|
|
534 | #endif |
|
|
535 | |
|
|
536 | #if __cplusplus |
|
|
537 | template<typename T> |
|
|
538 | static inline T ecb_div_rd (T val, T div) |
|
|
539 | { |
|
|
540 | return val < 0 ? - ((-val + div - 1) / div) : (val ) / div; |
|
|
541 | } |
|
|
542 | template<typename T> |
|
|
543 | static inline T ecb_div_ru (T val, T div) |
|
|
544 | { |
|
|
545 | return val < 0 ? - ((-val ) / div) : (val + div - 1) / div; |
|
|
546 | } |
|
|
547 | #else |
|
|
548 | #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div)) |
|
|
549 | #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div)) |
| 226 | #endif |
550 | #endif |
| 227 | |
551 | |
| 228 | #if ecb_cplusplus_does_not_suck |
552 | #if ecb_cplusplus_does_not_suck |
| 229 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
553 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
| 230 | template<typename T, int N> |
554 | template<typename T, int N> |
| … | |
… | |
| 234 | } |
558 | } |
| 235 | #else |
559 | #else |
| 236 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
560 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
| 237 | #endif |
561 | #endif |
| 238 | |
562 | |
| 239 | ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
563 | /*******************************************************************************/ |
| 240 | ECB_INLINE uint32_t |
564 | /* floating point stuff, can be disabled by defining ECB_NO_LIBM */ |
| 241 | ecb_rotr32 (uint32_t x, unsigned int count) |
|
|
| 242 | { |
|
|
| 243 | return (x << (32 - count)) | (x >> count); |
|
|
| 244 | } |
|
|
| 245 | |
565 | |
| 246 | ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
566 | /* basically, everything uses "ieee pure-endian" floating point numbers */ |
| 247 | ECB_INLINE uint32_t |
567 | /* the only noteworthy exception is ancient armle, which uses order 43218765 */ |
| 248 | ecb_rotl32 (uint32_t x, unsigned int count) |
568 | #if 0 \ |
| 249 | { |
569 | || __i386 || __i386__ \ |
| 250 | return (x >> (32 - count)) | (x << count); |
570 | || __amd64 || __amd64__ || __x86_64 || __x86_64__ \ |
| 251 | } |
571 | || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \ |
|
|
572 | || defined __arm__ && defined __ARM_EABI__ \ |
|
|
573 | || defined __s390__ || defined __s390x__ \ |
|
|
574 | || defined __mips__ \ |
|
|
575 | || defined __alpha__ \ |
|
|
576 | || defined __hppa__ \ |
|
|
577 | || defined __ia64__ \ |
|
|
578 | || defined __m68k__ \ |
|
|
579 | || defined __m88k__ \ |
|
|
580 | || defined __sh__ \ |
|
|
581 | || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 |
|
|
582 | #define ECB_STDFP 1 |
|
|
583 | #include <string.h> /* for memcpy */ |
|
|
584 | #else |
|
|
585 | #define ECB_STDFP 0 |
|
|
586 | #endif |
| 252 | |
587 | |
|
|
588 | #ifndef ECB_NO_LIBM |
|
|
589 | |
|
|
590 | #include <math.h> /* for frexp*, ldexp* */ |
|
|
591 | |
|
|
592 | /* converts an ieee half/binary16 to a float */ |
|
|
593 | ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const; |
|
|
594 | ecb_function_ float |
|
|
595 | ecb_binary16_to_float (uint16_t x) |
|
|
596 | { |
|
|
597 | int e = (x >> 10) & 0x1f; |
|
|
598 | int m = x & 0x3ff; |
|
|
599 | float r; |
|
|
600 | |
|
|
601 | if (!e) |
|
|
602 | r = ldexpf (m , -24); |
|
|
603 | else if (e != 31) |
|
|
604 | r = ldexpf (m + 0x400, e - 25); |
|
|
605 | else if (m) |
|
|
606 | #ifdef NAN |
|
|
607 | r = NAN; |
|
|
608 | #endif |
|
|
609 | else |
|
|
610 | r = INFINITY; |
|
|
611 | |
|
|
612 | return x & 0x8000 ? -r : r; |
|
|
613 | } |
|
|
614 | |
|
|
615 | /* convert a float to ieee single/binary32 */ |
|
|
616 | ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const; |
|
|
617 | ecb_function_ uint32_t |
|
|
618 | ecb_float_to_binary32 (float x) |
|
|
619 | { |
|
|
620 | uint32_t r; |
|
|
621 | |
|
|
622 | #if ECB_STDFP |
|
|
623 | memcpy (&r, &x, 4); |
|
|
624 | #else |
|
|
625 | /* slow emulation, works for anything but -0 */ |
|
|
626 | uint32_t m; |
|
|
627 | int e; |
|
|
628 | |
|
|
629 | if (x == 0e0f ) return 0x00000000U; |
|
|
630 | if (x > +3.40282346638528860e+38f) return 0x7f800000U; |
|
|
631 | if (x < -3.40282346638528860e+38f) return 0xff800000U; |
|
|
632 | if (x != x ) return 0x7fbfffffU; |
|
|
633 | |
|
|
634 | m = frexpf (x, &e) * 0x1000000U; |
|
|
635 | |
|
|
636 | r = m & 0x80000000U; |
|
|
637 | |
|
|
638 | if (r) |
|
|
639 | m = -m; |
|
|
640 | |
|
|
641 | if (e <= -126) |
|
|
642 | { |
|
|
643 | m &= 0xffffffU; |
|
|
644 | m >>= (-125 - e); |
|
|
645 | e = -126; |
|
|
646 | } |
|
|
647 | |
|
|
648 | r |= (e + 126) << 23; |
|
|
649 | r |= m & 0x7fffffU; |
| 253 | #endif |
650 | #endif |
| 254 | |
651 | |
|
|
652 | return r; |
|
|
653 | } |
|
|
654 | |
|
|
655 | /* converts an ieee single/binary32 to a float */ |
|
|
656 | ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const; |
|
|
657 | ecb_function_ float |
|
|
658 | ecb_binary32_to_float (uint32_t x) |
|
|
659 | { |
|
|
660 | float r; |
|
|
661 | |
|
|
662 | #if ECB_STDFP |
|
|
663 | memcpy (&r, &x, 4); |
|
|
664 | #else |
|
|
665 | /* emulation, only works for normals and subnormals and +0 */ |
|
|
666 | int neg = x >> 31; |
|
|
667 | int e = (x >> 23) & 0xffU; |
|
|
668 | |
|
|
669 | x &= 0x7fffffU; |
|
|
670 | |
|
|
671 | if (e) |
|
|
672 | x |= 0x800000U; |
|
|
673 | else |
|
|
674 | e = 1; |
|
|
675 | |
|
|
676 | /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ |
|
|
677 | r = ldexpf (x * (0.5f / 0x800000U), e - 126); |
|
|
678 | |
|
|
679 | r = neg ? -r : r; |
|
|
680 | #endif |
|
|
681 | |
|
|
682 | return r; |
|
|
683 | } |
|
|
684 | |
|
|
685 | /* convert a double to ieee double/binary64 */ |
|
|
686 | ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const; |
|
|
687 | ecb_function_ uint64_t |
|
|
688 | ecb_double_to_binary64 (double x) |
|
|
689 | { |
|
|
690 | uint64_t r; |
|
|
691 | |
|
|
692 | #if ECB_STDFP |
|
|
693 | memcpy (&r, &x, 8); |
|
|
694 | #else |
|
|
695 | /* slow emulation, works for anything but -0 */ |
|
|
696 | uint64_t m; |
|
|
697 | int e; |
|
|
698 | |
|
|
699 | if (x == 0e0 ) return 0x0000000000000000U; |
|
|
700 | if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U; |
|
|
701 | if (x < -1.79769313486231470e+308) return 0xfff0000000000000U; |
|
|
702 | if (x != x ) return 0X7ff7ffffffffffffU; |
|
|
703 | |
|
|
704 | m = frexp (x, &e) * 0x20000000000000U; |
|
|
705 | |
|
|
706 | r = m & 0x8000000000000000;; |
|
|
707 | |
|
|
708 | if (r) |
|
|
709 | m = -m; |
|
|
710 | |
|
|
711 | if (e <= -1022) |
|
|
712 | { |
|
|
713 | m &= 0x1fffffffffffffU; |
|
|
714 | m >>= (-1021 - e); |
|
|
715 | e = -1022; |
|
|
716 | } |
|
|
717 | |
|
|
718 | r |= ((uint64_t)(e + 1022)) << 52; |
|
|
719 | r |= m & 0xfffffffffffffU; |
|
|
720 | #endif |
|
|
721 | |
|
|
722 | return r; |
|
|
723 | } |
|
|
724 | |
|
|
725 | /* converts an ieee double/binary64 to a double */ |
|
|
726 | ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const; |
|
|
727 | ecb_function_ double |
|
|
728 | ecb_binary64_to_double (uint64_t x) |
|
|
729 | { |
|
|
730 | double r; |
|
|
731 | |
|
|
732 | #if ECB_STDFP |
|
|
733 | memcpy (&r, &x, 8); |
|
|
734 | #else |
|
|
735 | /* emulation, only works for normals and subnormals and +0 */ |
|
|
736 | int neg = x >> 63; |
|
|
737 | int e = (x >> 52) & 0x7ffU; |
|
|
738 | |
|
|
739 | x &= 0xfffffffffffffU; |
|
|
740 | |
|
|
741 | if (e) |
|
|
742 | x |= 0x10000000000000U; |
|
|
743 | else |
|
|
744 | e = 1; |
|
|
745 | |
|
|
746 | /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */ |
|
|
747 | r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022); |
|
|
748 | |
|
|
749 | r = neg ? -r : r; |
|
|
750 | #endif |
|
|
751 | |
|
|
752 | return r; |
|
|
753 | } |
|
|
754 | |
|
|
755 | #endif |
|
|
756 | |
|
|
757 | #endif |
|
|
758 | |
