| 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 (©) 2009-2014 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. |
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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 | |
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44 | /* 16 bits major, 16 bits minor */ |
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45 | #define ECB_VERSION 0x00010003 |
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46 | |
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47 | #ifdef _WIN32 |
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48 | typedef signed char int8_t; |
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49 | typedef unsigned char uint8_t; |
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50 | typedef signed short int16_t; |
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51 | typedef unsigned short uint16_t; |
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52 | typedef signed int int32_t; |
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53 | typedef unsigned int uint32_t; |
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54 | #if __GNUC__ |
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55 | typedef signed long long int64_t; |
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56 | typedef unsigned long long uint64_t; |
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57 | #else /* _MSC_VER || __BORLANDC__ */ |
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58 | typedef signed __int64 int64_t; |
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59 | typedef unsigned __int64 uint64_t; |
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60 | #endif |
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61 | #ifdef _WIN64 |
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62 | #define ECB_PTRSIZE 8 |
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63 | typedef uint64_t uintptr_t; |
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64 | typedef int64_t intptr_t; |
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65 | #else |
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66 | #define ECB_PTRSIZE 4 |
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67 | typedef uint32_t uintptr_t; |
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68 | typedef int32_t intptr_t; |
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69 | #endif |
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70 | #else |
| 33 | #include <inttypes.h> |
71 | #include <inttypes.h> |
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72 | #if UINTMAX_MAX > 0xffffffffU |
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73 | #define ECB_PTRSIZE 8 |
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74 | #else |
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75 | #define ECB_PTRSIZE 4 |
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76 | #endif |
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77 | #endif |
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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 |
| 34 | |
87 | |
| 35 | /* many compilers define _GNUC_ to some versions but then only implement |
88 | /* many compilers define _GNUC_ to some versions but then only implement |
| 36 | * what their idiot authors think are the "more important" extensions, |
89 | * what their idiot authors think are the "more important" extensions, |
| 37 | * causing enourmous grief in return for some better fake benchmark numbers. |
90 | * causing enormous grief in return for some better fake benchmark numbers. |
| 38 | * or so. |
91 | * or so. |
| 39 | * 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 |
| 40 | * 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. |
| 41 | */ |
94 | */ |
| 42 | #ifndef ECB_GCC_VERSION |
95 | #ifndef ECB_GCC_VERSION |
| 43 | #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) |
96 | #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__ |
| 44 | #define ECB_GCC_VERSION(major,minor) 0 |
97 | #define ECB_GCC_VERSION(major,minor) 0 |
| 45 | #else |
98 | #else |
| 46 | #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))) |
| 47 | #endif |
100 | #endif |
| 48 | #endif |
101 | #endif |
| 49 | |
102 | |
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103 | #define ECB_CPP (__cplusplus+0) |
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104 | #define ECB_CPP11 (__cplusplus >= 201103L) |
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105 | |
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106 | #if ECB_CPP |
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107 | #define ECB_C 0 |
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108 | #define ECB_STDC_VERSION 0 |
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109 | #else |
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110 | #define ECB_C 1 |
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111 | #define ECB_STDC_VERSION __STDC_VERSION__ |
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112 | #endif |
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113 | |
| 50 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
114 | #define ECB_C99 (ECB_STDC_VERSION >= 199901L) |
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115 | #define ECB_C11 (ECB_STDC_VERSION >= 201112L) |
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116 | |
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117 | #if ECB_CPP |
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118 | #define ECB_EXTERN_C extern "C" |
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119 | #define ECB_EXTERN_C_BEG ECB_EXTERN_C { |
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120 | #define ECB_EXTERN_C_END } |
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121 | #else |
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122 | #define ECB_EXTERN_C extern |
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123 | #define ECB_EXTERN_C_BEG |
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124 | #define ECB_EXTERN_C_END |
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125 | #endif |
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126 | |
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127 | /*****************************************************************************/ |
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128 | |
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129 | /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ |
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130 | /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ |
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131 | |
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132 | #if ECB_NO_THREADS |
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133 | #define ECB_NO_SMP 1 |
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134 | #endif |
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135 | |
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136 | #if ECB_NO_SMP |
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137 | #define ECB_MEMORY_FENCE do { } while (0) |
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138 | #endif |
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139 | |
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140 | #ifndef ECB_MEMORY_FENCE |
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141 | #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
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142 | #if __i386 || __i386__ |
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143 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") |
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144 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") |
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145 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
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146 | #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ |
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147 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") |
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148 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory") |
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149 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
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150 | #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ |
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151 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
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152 | #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ |
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153 | || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ |
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154 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
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155 | #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ |
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156 | || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ |
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157 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
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158 | #elif __aarch64__ |
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159 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory") |
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160 | #elif (__sparc || __sparc__) && !__sparcv8 |
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161 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") |
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162 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") |
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163 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") |
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164 | #elif defined __s390__ || defined __s390x__ |
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165 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") |
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166 | #elif defined __mips__ |
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167 | /* GNU/Linux emulates sync on mips1 architectures, so we force its use */ |
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168 | /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */ |
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169 | #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory") |
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170 | #elif defined __alpha__ |
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171 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") |
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172 | #elif defined __hppa__ |
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173 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
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174 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
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175 | #elif defined __ia64__ |
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176 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory") |
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177 | #elif defined __m68k__ |
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178 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
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179 | #elif defined __m88k__ |
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180 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory") |
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181 | #elif defined __sh__ |
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182 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
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183 | #endif |
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184 | #endif |
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185 | #endif |
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186 | |
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187 | #ifndef ECB_MEMORY_FENCE |
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188 | #if ECB_GCC_VERSION(4,7) |
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189 | /* see comment below (stdatomic.h) about the C11 memory model. */ |
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190 | #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) |
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191 | #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE) |
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192 | #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE) |
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193 | |
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194 | /* The __has_feature syntax from clang is so misdesigned that we cannot use it |
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195 | * without risking compile time errors with other compilers. We *could* |
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196 | * define our own ecb_clang_has_feature, but I just can't be bothered to work |
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197 | * around this shit time and again. |
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198 | * #elif defined __clang && __has_feature (cxx_atomic) |
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199 | * // see comment below (stdatomic.h) about the C11 memory model. |
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200 | * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) |
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201 | * #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE) |
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202 | * #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE) |
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203 | */ |
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204 | |
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205 | #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ |
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206 | #define ECB_MEMORY_FENCE __sync_synchronize () |
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207 | #elif _MSC_VER >= 1500 /* VC++ 2008 */ |
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208 | /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */ |
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209 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
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210 | #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier() |
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211 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */ |
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212 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier() |
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213 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
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214 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
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215 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
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216 | #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */ |
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217 | #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier () |
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218 | #elif defined _WIN32 |
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219 | #include <WinNT.h> |
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220 | #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */ |
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221 | #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 |
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222 | #include <mbarrier.h> |
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223 | #define ECB_MEMORY_FENCE __machine_rw_barrier () |
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224 | #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier () |
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225 | #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier () |
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226 | #elif __xlC__ |
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227 | #define ECB_MEMORY_FENCE __sync () |
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228 | #endif |
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229 | #endif |
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230 | |
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231 | #ifndef ECB_MEMORY_FENCE |
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232 | #if ECB_C11 && !defined __STDC_NO_ATOMICS__ |
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233 | /* we assume that these memory fences work on all variables/all memory accesses, */ |
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234 | /* not just C11 atomics and atomic accesses */ |
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235 | #include <stdatomic.h> |
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236 | /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */ |
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237 | /* any fence other than seq_cst, which isn't very efficient for us. */ |
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238 | /* Why that is, we don't know - either the C11 memory model is quite useless */ |
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239 | /* for most usages, or gcc and clang have a bug */ |
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240 | /* I *currently* lean towards the latter, and inefficiently implement */ |
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241 | /* all three of ecb's fences as a seq_cst fence */ |
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242 | /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */ |
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243 | /* for all __atomic_thread_fence's except seq_cst */ |
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244 | #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst) |
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245 | #endif |
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246 | #endif |
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247 | |
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248 | #ifndef ECB_MEMORY_FENCE |
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249 | #if !ECB_AVOID_PTHREADS |
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250 | /* |
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251 | * if you get undefined symbol references to pthread_mutex_lock, |
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252 | * or failure to find pthread.h, then you should implement |
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253 | * the ECB_MEMORY_FENCE operations for your cpu/compiler |
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254 | * OR provide pthread.h and link against the posix thread library |
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255 | * of your system. |
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256 | */ |
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257 | #include <pthread.h> |
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258 | #define ECB_NEEDS_PTHREADS 1 |
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259 | #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1 |
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260 | |
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261 | static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER; |
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262 | #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0) |
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263 | #endif |
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264 | #endif |
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265 | |
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266 | #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE |
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267 | #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE |
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268 | #endif |
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269 | |
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270 | #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE |
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271 | #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE |
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272 | #endif |
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273 | |
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274 | /*****************************************************************************/ |
| 51 | |
275 | |
| 52 | #if __cplusplus |
276 | #if __cplusplus |
| 53 | #define ECB_INLINE static inline |
277 | #define ecb_inline static inline |
| 54 | #elif ECB_GCC_VERSION(2,5) |
278 | #elif ECB_GCC_VERSION(2,5) |
| 55 | #define ECB_INLINE static __inline__ |
279 | #define ecb_inline static __inline__ |
| 56 | #elif ECB_C99 |
280 | #elif ECB_C99 |
| 57 | #define ECB_INLINE static inline |
281 | #define ecb_inline static inline |
| 58 | #else |
282 | #else |
| 59 | #define ECB_INLINE static |
283 | #define ecb_inline static |
| 60 | #endif |
284 | #endif |
| 61 | |
285 | |
| 62 | #if ECB_GCC_VERSION(3,3) |
286 | #if ECB_GCC_VERSION(3,3) |
| 63 | #define ecb_restrict __restrict__ |
287 | #define ecb_restrict __restrict__ |
| 64 | #elif ECB_C99 |
288 | #elif ECB_C99 |
| … | |
… | |
| 72 | #define ECB_CONCAT_(a, b) a ## b |
296 | #define ECB_CONCAT_(a, b) a ## b |
| 73 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
297 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
| 74 | #define ECB_STRINGIFY_(a) # a |
298 | #define ECB_STRINGIFY_(a) # a |
| 75 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
299 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
| 76 | |
300 | |
| 77 | #define ecb_function_ ECB_INLINE |
301 | #define ecb_function_ ecb_inline |
| 78 | |
302 | |
| 79 | #if ECB_GCC_VERSION(3,1) |
303 | #if ECB_GCC_VERSION(3,1) |
| 80 | #define ecb_attribute(attrlist) __attribute__(attrlist) |
304 | #define ecb_attribute(attrlist) __attribute__(attrlist) |
| 81 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
305 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
| 82 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
306 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
| 83 | #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
307 | #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
| 84 | #else |
308 | #else |
| 85 | #define ecb_attribute(attrlist) |
309 | #define ecb_attribute(attrlist) |
|
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310 | |
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311 | /* possible C11 impl for integral types |
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312 | typedef struct ecb_is_constant_struct ecb_is_constant_struct; |
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313 | #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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314 | |
| 86 | #define ecb_is_constant(expr) 0 |
315 | #define ecb_is_constant(expr) 0 |
| 87 | #define ecb_expect(expr,value) (expr) |
316 | #define ecb_expect(expr,value) (expr) |
| 88 | #define ecb_prefetch(addr,rw,locality) |
317 | #define ecb_prefetch(addr,rw,locality) |
| 89 | #endif |
318 | #endif |
| 90 | |
319 | |
| … | |
… | |
| 93 | #define ecb_decltype(x) __decltype(x) |
322 | #define ecb_decltype(x) __decltype(x) |
| 94 | #elif ECB_GCC_VERSION(3,0) |
323 | #elif ECB_GCC_VERSION(3,0) |
| 95 | #define ecb_decltype(x) __typeof(x) |
324 | #define ecb_decltype(x) __typeof(x) |
| 96 | #endif |
325 | #endif |
| 97 | |
326 | |
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327 | #if _MSC_VER >= 1300 |
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328 | #define ecb_deprecated __declspec(deprecated) |
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329 | #else |
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330 | #define ecb_deprecated ecb_attribute ((__deprecated__)) |
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331 | #endif |
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332 | |
| 98 | #define ecb_noinline ecb_attribute ((__noinline__)) |
333 | #define ecb_noinline ecb_attribute ((__noinline__)) |
| 99 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
|
|
| 100 | #define ecb_unused ecb_attribute ((__unused__)) |
334 | #define ecb_unused ecb_attribute ((__unused__)) |
| 101 | #define ecb_const ecb_attribute ((__const__)) |
335 | #define ecb_const ecb_attribute ((__const__)) |
| 102 | #define ecb_pure ecb_attribute ((__pure__)) |
336 | #define ecb_pure ecb_attribute ((__pure__)) |
|
|
337 | |
|
|
338 | #if ECB_C11 |
|
|
339 | #define ecb_noreturn _Noreturn |
|
|
340 | #else |
|
|
341 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
|
|
342 | #endif |
| 103 | |
343 | |
| 104 | #if ECB_GCC_VERSION(4,3) |
344 | #if ECB_GCC_VERSION(4,3) |
| 105 | #define ecb_artificial ecb_attribute ((__artificial__)) |
345 | #define ecb_artificial ecb_attribute ((__artificial__)) |
| 106 | #define ecb_hot ecb_attribute ((__hot__)) |
346 | #define ecb_hot ecb_attribute ((__hot__)) |
| 107 | #define ecb_cold ecb_attribute ((__cold__)) |
347 | #define ecb_cold ecb_attribute ((__cold__)) |
| … | |
… | |
| 120 | #define ecb_likely(expr) ecb_expect_true (expr) |
360 | #define ecb_likely(expr) ecb_expect_true (expr) |
| 121 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
361 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
| 122 | |
362 | |
| 123 | /* count trailing zero bits and count # of one bits */ |
363 | /* count trailing zero bits and count # of one bits */ |
| 124 | #if ECB_GCC_VERSION(3,4) |
364 | #if ECB_GCC_VERSION(3,4) |
|
|
365 | /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ |
|
|
366 | #define ecb_ld32(x) (__builtin_clz (x) ^ 31) |
|
|
367 | #define ecb_ld64(x) (__builtin_clzll (x) ^ 63) |
| 125 | #define ecb_ctz32(x) __builtin_ctz (x) |
368 | #define ecb_ctz32(x) __builtin_ctz (x) |
|
|
369 | #define ecb_ctz64(x) __builtin_ctzll (x) |
| 126 | #define ecb_popcount32(x) __builtin_popcount (x) |
370 | #define ecb_popcount32(x) __builtin_popcount (x) |
|
|
371 | /* no popcountll */ |
| 127 | #else |
372 | #else |
| 128 | ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
373 | ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
| 129 | ecb_function_ int |
374 | ecb_function_ int |
| 130 | ecb_ctz32 (uint32_t x) |
375 | ecb_ctz32 (uint32_t x) |
| 131 | { |
376 | { |
| 132 | int r = 0; |
377 | int r = 0; |
| 133 | |
378 | |
| 134 | x &= -x; /* this isolates the lowest bit */ |
379 | x &= ~x + 1; /* this isolates the lowest bit */ |
| 135 | |
380 | |
|
|
381 | #if ECB_branchless_on_i386 |
|
|
382 | r += !!(x & 0xaaaaaaaa) << 0; |
|
|
383 | r += !!(x & 0xcccccccc) << 1; |
|
|
384 | r += !!(x & 0xf0f0f0f0) << 2; |
|
|
385 | r += !!(x & 0xff00ff00) << 3; |
|
|
386 | r += !!(x & 0xffff0000) << 4; |
|
|
387 | #else |
| 136 | if (x & 0xaaaaaaaa) r += 1; |
388 | if (x & 0xaaaaaaaa) r += 1; |
| 137 | if (x & 0xcccccccc) r += 2; |
389 | if (x & 0xcccccccc) r += 2; |
| 138 | if (x & 0xf0f0f0f0) r += 4; |
390 | if (x & 0xf0f0f0f0) r += 4; |
| 139 | if (x & 0xff00ff00) r += 8; |
391 | if (x & 0xff00ff00) r += 8; |
| 140 | if (x & 0xffff0000) r += 16; |
392 | if (x & 0xffff0000) r += 16; |
|
|
393 | #endif |
| 141 | |
394 | |
| 142 | return r; |
395 | return r; |
|
|
396 | } |
|
|
397 | |
|
|
398 | ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const; |
|
|
399 | ecb_function_ int |
|
|
400 | ecb_ctz64 (uint64_t x) |
|
|
401 | { |
|
|
402 | int shift = x & 0xffffffffU ? 0 : 32; |
|
|
403 | return ecb_ctz32 (x >> shift) + shift; |
| 143 | } |
404 | } |
| 144 | |
405 | |
| 145 | ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
406 | ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
| 146 | ecb_function_ int |
407 | ecb_function_ int |
| 147 | ecb_popcount32 (uint32_t x) |
408 | ecb_popcount32 (uint32_t x) |
| … | |
… | |
| 151 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
412 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
| 152 | x *= 0x01010101; |
413 | x *= 0x01010101; |
| 153 | |
414 | |
| 154 | return x >> 24; |
415 | return x >> 24; |
| 155 | } |
416 | } |
|
|
417 | |
|
|
418 | ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
|
|
419 | ecb_function_ int ecb_ld32 (uint32_t x) |
|
|
420 | { |
|
|
421 | int r = 0; |
|
|
422 | |
|
|
423 | if (x >> 16) { x >>= 16; r += 16; } |
|
|
424 | if (x >> 8) { x >>= 8; r += 8; } |
|
|
425 | if (x >> 4) { x >>= 4; r += 4; } |
|
|
426 | if (x >> 2) { x >>= 2; r += 2; } |
|
|
427 | if (x >> 1) { r += 1; } |
|
|
428 | |
|
|
429 | return r; |
|
|
430 | } |
|
|
431 | |
|
|
432 | ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; |
|
|
433 | ecb_function_ int ecb_ld64 (uint64_t x) |
|
|
434 | { |
|
|
435 | int r = 0; |
|
|
436 | |
|
|
437 | if (x >> 32) { x >>= 32; r += 32; } |
|
|
438 | |
|
|
439 | return r + ecb_ld32 (x); |
|
|
440 | } |
| 156 | #endif |
441 | #endif |
|
|
442 | |
|
|
443 | ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const; |
|
|
444 | ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); } |
|
|
445 | ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const; |
|
|
446 | ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); } |
|
|
447 | |
|
|
448 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const; |
|
|
449 | ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) |
|
|
450 | { |
|
|
451 | return ( (x * 0x0802U & 0x22110U) |
|
|
452 | | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; |
|
|
453 | } |
|
|
454 | |
|
|
455 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const; |
|
|
456 | ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) |
|
|
457 | { |
|
|
458 | x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1); |
|
|
459 | x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2); |
|
|
460 | x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4); |
|
|
461 | x = ( x >> 8 ) | ( x << 8); |
|
|
462 | |
|
|
463 | return x; |
|
|
464 | } |
|
|
465 | |
|
|
466 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const; |
|
|
467 | ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) |
|
|
468 | { |
|
|
469 | x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1); |
|
|
470 | x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2); |
|
|
471 | x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4); |
|
|
472 | x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8); |
|
|
473 | x = ( x >> 16 ) | ( x << 16); |
|
|
474 | |
|
|
475 | return x; |
|
|
476 | } |
|
|
477 | |
|
|
478 | /* popcount64 is only available on 64 bit cpus as gcc builtin */ |
|
|
479 | /* so for this version we are lazy */ |
|
|
480 | ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; |
|
|
481 | ecb_function_ int |
|
|
482 | ecb_popcount64 (uint64_t x) |
|
|
483 | { |
|
|
484 | return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); |
|
|
485 | } |
|
|
486 | |
|
|
487 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const; |
|
|
488 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const; |
|
|
489 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const; |
|
|
490 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const; |
|
|
491 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
|
|
492 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
|
|
493 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const; |
|
|
494 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const; |
|
|
495 | |
|
|
496 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } |
|
|
497 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } |
|
|
498 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } |
|
|
499 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } |
|
|
500 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } |
|
|
501 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } |
|
|
502 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } |
|
|
503 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } |
| 157 | |
504 | |
| 158 | #if ECB_GCC_VERSION(4,3) |
505 | #if ECB_GCC_VERSION(4,3) |
| 159 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
|
|
| 160 | #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
506 | #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) |
|
|
507 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
|
|
508 | #define ecb_bswap64(x) __builtin_bswap64 (x) |
| 161 | #else |
509 | #else |
|
|
510 | ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; |
|
|
511 | ecb_function_ uint16_t |
|
|
512 | ecb_bswap16 (uint16_t x) |
|
|
513 | { |
|
|
514 | return ecb_rotl16 (x, 8); |
|
|
515 | } |
|
|
516 | |
| 162 | ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
517 | ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
| 163 | ecb_function_ uint32_t |
518 | ecb_function_ uint32_t |
| 164 | ecb_bswap32 (uint32_t x) |
519 | ecb_bswap32 (uint32_t x) |
| 165 | { |
520 | { |
| 166 | return (x >> 24) |
521 | return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); |
| 167 | | ((x >> 8) & 0x0000ff00) |
|
|
| 168 | | ((x << 8) & 0x00ff0000) |
|
|
| 169 | | (x << 24); |
|
|
| 170 | } |
522 | } |
| 171 | |
523 | |
| 172 | ecb_function_ uint32_t ecb_bswap16 (uint32_t x) ecb_const; |
524 | ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; |
| 173 | ecb_function_ uint32_t |
525 | ecb_function_ uint64_t |
| 174 | ecb_bswap16 (uint32_t x) |
526 | ecb_bswap64 (uint64_t x) |
| 175 | { |
527 | { |
| 176 | return ((x >> 8) & 0xff) |
528 | return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); |
| 177 | | ((x << 8) & 0x00ff0000) |
|
|
| 178 | | (x << 24); |
|
|
| 179 | } |
529 | } |
| 180 | #endif |
530 | #endif |
| 181 | |
531 | |
| 182 | #if ECB_GCC_VERSION(4,5) |
532 | #if ECB_GCC_VERSION(4,5) |
| 183 | #define ecb_unreachable() __builtin_unreachable () |
533 | #define ecb_unreachable() __builtin_unreachable () |
| 184 | #else |
534 | #else |
| 185 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
535 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
| 186 | ecb_function_ void ecb_unreachable (void) ecb_noreturn; |
536 | ecb_inline void ecb_unreachable (void) ecb_noreturn; |
| 187 | ecb_function_ void ecb_unreachable (void) { } |
537 | ecb_inline void ecb_unreachable (void) { } |
| 188 | #endif |
538 | #endif |
| 189 | |
539 | |
| 190 | /* try to tell the compiler that some condition is definitely true */ |
540 | /* try to tell the compiler that some condition is definitely true */ |
| 191 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
541 | #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0 |
| 192 | |
542 | |
| 193 | ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; |
543 | ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; |
| 194 | ecb_function_ unsigned char |
544 | ecb_inline unsigned char |
| 195 | ecb_byteorder_helper (void) |
545 | ecb_byteorder_helper (void) |
| 196 | { |
546 | { |
| 197 | const uint32_t u = 0x11223344; |
547 | /* the union code still generates code under pressure in gcc, */ |
| 198 | return *(unsigned char *)&u; |
548 | /* but less than using pointers, and always seems to */ |
|
|
549 | /* successfully return a constant. */ |
|
|
550 | /* the reason why we have this horrible preprocessor mess */ |
|
|
551 | /* is to avoid it in all cases, at least on common architectures */ |
|
|
552 | /* or when using a recent enough gcc version (>= 4.6) */ |
|
|
553 | #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64 |
|
|
554 | return 0x44; |
|
|
555 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
|
|
556 | return 0x44; |
|
|
557 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
|
|
558 | return 0x11; |
|
|
559 | #else |
|
|
560 | union |
|
|
561 | { |
|
|
562 | uint32_t i; |
|
|
563 | uint8_t c; |
|
|
564 | } u = { 0x11223344 }; |
|
|
565 | return u.c; |
|
|
566 | #endif |
| 199 | } |
567 | } |
| 200 | |
568 | |
| 201 | ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; |
569 | ecb_inline ecb_bool ecb_big_endian (void) ecb_const; |
| 202 | ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
570 | ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
| 203 | ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; |
571 | ecb_inline ecb_bool ecb_little_endian (void) ecb_const; |
| 204 | ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
572 | ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
| 205 | |
573 | |
| 206 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
574 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
| 207 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
575 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
| 208 | #else |
576 | #else |
| 209 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
577 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
|
|
578 | #endif |
|
|
579 | |
|
|
580 | #if __cplusplus |
|
|
581 | template<typename T> |
|
|
582 | static inline T ecb_div_rd (T val, T div) |
|
|
583 | { |
|
|
584 | return val < 0 ? - ((-val + div - 1) / div) : (val ) / div; |
|
|
585 | } |
|
|
586 | template<typename T> |
|
|
587 | static inline T ecb_div_ru (T val, T div) |
|
|
588 | { |
|
|
589 | return val < 0 ? - ((-val ) / div) : (val + div - 1) / div; |
|
|
590 | } |
|
|
591 | #else |
|
|
592 | #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div)) |
|
|
593 | #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div)) |
| 210 | #endif |
594 | #endif |
| 211 | |
595 | |
| 212 | #if ecb_cplusplus_does_not_suck |
596 | #if ecb_cplusplus_does_not_suck |
| 213 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
597 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
| 214 | template<typename T, int N> |
598 | template<typename T, int N> |
| … | |
… | |
| 218 | } |
602 | } |
| 219 | #else |
603 | #else |
| 220 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
604 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
| 221 | #endif |
605 | #endif |
| 222 | |
606 | |
| 223 | ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
607 | /*******************************************************************************/ |
| 224 | ECB_INLINE uint32_t |
608 | /* floating point stuff, can be disabled by defining ECB_NO_LIBM */ |
| 225 | ecb_rotr32 (uint32_t x, unsigned int count) |
|
|
| 226 | { |
|
|
| 227 | return (x << (32 - count)) | (x >> count); |
|
|
| 228 | } |
|
|
| 229 | |
609 | |
| 230 | ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
610 | /* basically, everything uses "ieee pure-endian" floating point numbers */ |
| 231 | ECB_INLINE uint32_t |
611 | /* the only noteworthy exception is ancient armle, which uses order 43218765 */ |
| 232 | ecb_rotl32 (uint32_t x, unsigned int count) |
612 | #if 0 \ |
| 233 | { |
613 | || __i386 || __i386__ \ |
| 234 | return (x >> (32 - count)) | (x << count); |
614 | || __amd64 || __amd64__ || __x86_64 || __x86_64__ \ |
| 235 | } |
615 | || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \ |
|
|
616 | || defined __s390__ || defined __s390x__ \ |
|
|
617 | || defined __mips__ \ |
|
|
618 | || defined __alpha__ \ |
|
|
619 | || defined __hppa__ \ |
|
|
620 | || defined __ia64__ \ |
|
|
621 | || defined __m68k__ \ |
|
|
622 | || defined __m88k__ \ |
|
|
623 | || defined __sh__ \ |
|
|
624 | || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 \ |
|
|
625 | || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \ |
|
|
626 | || defined __aarch64__ |
|
|
627 | #define ECB_STDFP 1 |
|
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628 | #include <string.h> /* for memcpy */ |
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629 | #else |
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630 | #define ECB_STDFP 0 |
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631 | #endif |
| 236 | |
632 | |
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633 | #ifndef ECB_NO_LIBM |
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634 | |
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635 | #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */ |
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636 | |
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637 | /* only the oldest of old doesn't have this one. solaris. */ |
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638 | #ifdef INFINITY |
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639 | #define ECB_INFINITY INFINITY |
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640 | #else |
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641 | #define ECB_INFINITY HUGE_VAL |
| 237 | #endif |
642 | #endif |
| 238 | |
643 | |
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644 | #ifdef NAN |
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645 | #define ECB_NAN NAN |
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646 | #else |
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647 | #define ECB_NAN ECB_INFINITY |
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648 | #endif |
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649 | |
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650 | /* converts an ieee half/binary16 to a float */ |
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651 | ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const; |
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652 | ecb_function_ float |
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653 | ecb_binary16_to_float (uint16_t x) |
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654 | { |
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655 | int e = (x >> 10) & 0x1f; |
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656 | int m = x & 0x3ff; |
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657 | float r; |
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658 | |
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659 | if (!e ) r = ldexpf (m , -24); |
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660 | else if (e != 31) r = ldexpf (m + 0x400, e - 25); |
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661 | else if (m ) r = ECB_NAN; |
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662 | else r = ECB_INFINITY; |
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663 | |
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664 | return x & 0x8000 ? -r : r; |
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665 | } |
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666 | |
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667 | /* convert a float to ieee single/binary32 */ |
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668 | ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const; |
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669 | ecb_function_ uint32_t |
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670 | ecb_float_to_binary32 (float x) |
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671 | { |
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672 | uint32_t r; |
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673 | |
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674 | #if ECB_STDFP |
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675 | memcpy (&r, &x, 4); |
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676 | #else |
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677 | /* slow emulation, works for anything but -0 */ |
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678 | uint32_t m; |
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679 | int e; |
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680 | |
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681 | if (x == 0e0f ) return 0x00000000U; |
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682 | if (x > +3.40282346638528860e+38f) return 0x7f800000U; |
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683 | if (x < -3.40282346638528860e+38f) return 0xff800000U; |
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684 | if (x != x ) return 0x7fbfffffU; |
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685 | |
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686 | m = frexpf (x, &e) * 0x1000000U; |
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687 | |
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688 | r = m & 0x80000000U; |
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689 | |
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690 | if (r) |
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691 | m = -m; |
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692 | |
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693 | if (e <= -126) |
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694 | { |
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695 | m &= 0xffffffU; |
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696 | m >>= (-125 - e); |
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697 | e = -126; |
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698 | } |
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699 | |
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700 | r |= (e + 126) << 23; |
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701 | r |= m & 0x7fffffU; |
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702 | #endif |
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703 | |
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704 | return r; |
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705 | } |
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706 | |
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707 | /* converts an ieee single/binary32 to a float */ |
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708 | ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const; |
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709 | ecb_function_ float |
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710 | ecb_binary32_to_float (uint32_t x) |
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711 | { |
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712 | float r; |
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713 | |
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714 | #if ECB_STDFP |
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715 | memcpy (&r, &x, 4); |
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716 | #else |
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717 | /* emulation, only works for normals and subnormals and +0 */ |
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718 | int neg = x >> 31; |
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719 | int e = (x >> 23) & 0xffU; |
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720 | |
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721 | x &= 0x7fffffU; |
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722 | |
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723 | if (e) |
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724 | x |= 0x800000U; |
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725 | else |
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726 | e = 1; |
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727 | |
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728 | /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ |
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729 | r = ldexpf (x * (0.5f / 0x800000U), e - 126); |
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730 | |
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731 | r = neg ? -r : r; |
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732 | #endif |
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733 | |
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734 | return r; |
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735 | } |
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736 | |
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737 | /* convert a double to ieee double/binary64 */ |
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738 | ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const; |
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739 | ecb_function_ uint64_t |
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740 | ecb_double_to_binary64 (double x) |
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741 | { |
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742 | uint64_t r; |
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743 | |
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744 | #if ECB_STDFP |
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745 | memcpy (&r, &x, 8); |
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746 | #else |
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747 | /* slow emulation, works for anything but -0 */ |
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748 | uint64_t m; |
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749 | int e; |
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750 | |
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751 | if (x == 0e0 ) return 0x0000000000000000U; |
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752 | if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U; |
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753 | if (x < -1.79769313486231470e+308) return 0xfff0000000000000U; |
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754 | if (x != x ) return 0X7ff7ffffffffffffU; |
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755 | |
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756 | m = frexp (x, &e) * 0x20000000000000U; |
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757 | |
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758 | r = m & 0x8000000000000000;; |
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759 | |
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760 | if (r) |
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761 | m = -m; |
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762 | |
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763 | if (e <= -1022) |
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764 | { |
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765 | m &= 0x1fffffffffffffU; |
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766 | m >>= (-1021 - e); |
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767 | e = -1022; |
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768 | } |
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769 | |
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770 | r |= ((uint64_t)(e + 1022)) << 52; |
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771 | r |= m & 0xfffffffffffffU; |
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772 | #endif |
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773 | |
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774 | return r; |
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775 | } |
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776 | |
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777 | /* converts an ieee double/binary64 to a double */ |
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778 | ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const; |
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779 | ecb_function_ double |
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780 | ecb_binary64_to_double (uint64_t x) |
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781 | { |
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782 | double r; |
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783 | |
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784 | #if ECB_STDFP |
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785 | memcpy (&r, &x, 8); |
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786 | #else |
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787 | /* emulation, only works for normals and subnormals and +0 */ |
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788 | int neg = x >> 63; |
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789 | int e = (x >> 52) & 0x7ffU; |
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790 | |
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791 | x &= 0xfffffffffffffU; |
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792 | |
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793 | if (e) |
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794 | x |= 0x10000000000000U; |
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795 | else |
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796 | e = 1; |
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797 | |
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798 | /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */ |
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799 | r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022); |
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800 | |
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801 | r = neg ? -r : r; |
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802 | #endif |
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803 | |
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804 | return r; |
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805 | } |
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806 | |
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807 | #endif |
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808 | |
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809 | #endif |
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810 | |
