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 |
4 | * Copyright (©) 2009-2011 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 | |
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33 | #ifdef _WIN32 |
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34 | typedef signed char int8_t; |
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35 | typedef unsigned char uint8_t; |
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36 | typedef signed short int16_t; |
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37 | typedef unsigned short uint16_t; |
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38 | typedef signed int int32_t; |
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39 | typedef unsigned int uint32_t; |
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40 | #if __GNUC__ |
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41 | typedef signed long long int64_t; |
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42 | typedef unsigned long long uint64_t; |
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43 | #else /* _MSC_VER || __BORLANDC__ */ |
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44 | typedef signed __int64 int64_t; |
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45 | typedef unsigned __int64 uint64_t; |
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46 | #endif |
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47 | #else |
33 | #include <inttypes.h> |
48 | #include <inttypes.h> |
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49 | #endif |
34 | |
50 | |
35 | /* many compilers define _GNUC_ to some versions but then only implement |
51 | /* many compilers define _GNUC_ to some versions but then only implement |
36 | * what their idiot authors think are the "more important" extensions, |
52 | * what their idiot authors think are the "more important" extensions, |
37 | * causing enourmous grief in return for some better fake benchmark numbers. |
53 | * causing enourmous grief in return for some better fake benchmark numbers. |
38 | * or so. |
54 | * or so. |
39 | * we try to detect these and simply assume they are not gcc - if they have |
55 | * 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. |
56 | * an issue with that they should have done it right in the first place. |
41 | */ |
57 | */ |
42 | #ifndef ECB_GCC_VERSION |
58 | #ifndef ECB_GCC_VERSION |
43 | # if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) |
59 | #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 |
60 | #define ECB_GCC_VERSION(major,minor) 0 |
45 | # else |
61 | #else |
46 | # define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
62 | #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
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63 | #endif |
47 | # endif |
64 | #endif |
48 | #endif |
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49 | |
65 | |
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66 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
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67 | |
50 | #ifndef __cplusplus |
68 | #if __cplusplus |
51 | # if __STDC_VERSION__ >= 199901L |
69 | #define ecb_inline static inline |
52 | # define ECB_INLINE inline |
70 | #elif ECB_GCC_VERSION(2,5) |
53 | typedef _Bool ecb_bool; |
71 | #define ecb_inline static __inline__ |
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72 | #elif ECB_C99 |
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73 | #define ecb_inline static inline |
54 | # else |
74 | #else |
55 | # define ECB_INLINE inline /* yeah! */ |
75 | #define ecb_inline static |
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76 | #endif |
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77 | |
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78 | #if ECB_GCC_VERSION(3,3) |
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79 | #define ecb_restrict __restrict__ |
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80 | #elif ECB_C99 |
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81 | #define ecb_restrict restrict |
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82 | #else |
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83 | #define ecb_restrict |
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84 | #endif |
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85 | |
56 | typedef int ecb_bool; |
86 | typedef int ecb_bool; |
57 | # endif |
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58 | #endif |
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59 | |
87 | |
60 | #define ECB_CONCAT_(a, b) a ## b |
88 | #define ECB_CONCAT_(a, b) a ## b |
61 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
89 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
62 | #define ECB_STRINGIFY_(a) # a |
90 | #define ECB_STRINGIFY_(a) # a |
63 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
91 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
64 | |
92 | |
65 | #define ECB_HEADER_INLINE static ECB_INLINE |
93 | #define ecb_function_ ecb_inline |
66 | |
94 | |
67 | #if ECB_GCC_VERSION(3,1) |
95 | #if ECB_GCC_VERSION(3,1) |
68 | # define ecb_attribute(attrlist) __attribute__(attrlist) |
96 | #define ecb_attribute(attrlist) __attribute__(attrlist) |
69 | # define ecb_is_constant(expr) __builtin_constant_p (expr) |
97 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
70 | # define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
98 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
71 | # define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
99 | #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
72 | #else |
100 | #else |
73 | # define ecb_attribute(attrlist) |
101 | #define ecb_attribute(attrlist) |
74 | # define ecb_is_constant(expr) 0 |
102 | #define ecb_is_constant(expr) 0 |
75 | # define ecb_expect(expr,value) (expr) |
103 | #define ecb_expect(expr,value) (expr) |
76 | # define ecb_prefetch(addr,rw,locality) |
104 | #define ecb_prefetch(addr,rw,locality) |
77 | #endif |
105 | #endif |
78 | |
106 | |
79 | /* no emulation for ecb_decltype */ |
107 | /* no emulation for ecb_decltype */ |
80 | #if ECB_GCC_VERSION(4,5) |
108 | #if ECB_GCC_VERSION(4,5) |
81 | # define ecb_decltype(x) __decltype(x) |
109 | #define ecb_decltype(x) __decltype(x) |
82 | #elif ECB_GCC_VERSION(3,0) |
110 | #elif ECB_GCC_VERSION(3,0) |
83 | # define ecb_decltype(x) typeof(x) |
111 | #define ecb_decltype(x) __typeof(x) |
84 | #endif |
112 | #endif |
85 | |
113 | |
86 | #define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */ |
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87 | #define ecb_noinline ecb_attribute ((__noinline__)) |
114 | #define ecb_noinline ecb_attribute ((__noinline__)) |
88 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
115 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
89 | #define ecb_unused ecb_attribute ((__unused__)) |
116 | #define ecb_unused ecb_attribute ((__unused__)) |
90 | #define ecb_const ecb_attribute ((__const__)) |
117 | #define ecb_const ecb_attribute ((__const__)) |
91 | #define ecb_pure ecb_attribute ((__pure__)) |
118 | #define ecb_pure ecb_attribute ((__pure__)) |
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119 | |
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120 | #if ECB_GCC_VERSION(4,3) |
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121 | #define ecb_artificial ecb_attribute ((__artificial__)) |
92 | #define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */ |
122 | #define ecb_hot ecb_attribute ((__hot__)) |
93 | #define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */ |
123 | #define ecb_cold ecb_attribute ((__cold__)) |
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124 | #else |
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125 | #define ecb_artificial |
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126 | #define ecb_hot |
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127 | #define ecb_cold |
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128 | #endif |
94 | |
129 | |
95 | /* put into if's if you are very sure that the expression */ |
130 | /* put around conditional expressions if you are very sure that the */ |
96 | /* is mostly true or mosty false. note that these return */ |
131 | /* expression is mostly true or mostly false. note that these return */ |
97 | /* booleans, not the expression. */ |
132 | /* booleans, not the expression. */ |
98 | #define ecb_unlikely(expr) ecb_expect (!!(expr), 0) |
133 | #define ecb_expect_false(expr) ecb_expect (!!(expr), 0) |
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134 | #define ecb_expect_true(expr) ecb_expect (!!(expr), 1) |
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135 | /* for compatibility to the rest of the world */ |
99 | #define ecb_likely(expr) ecb_expect (!!(expr), 1) |
136 | #define ecb_likely(expr) ecb_expect_true (expr) |
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137 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
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138 | |
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139 | /* count trailing zero bits and count # of one bits */ |
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140 | #if ECB_GCC_VERSION(3,4) |
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141 | /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */ |
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142 | #define ecb_ld32(x) (__builtin_clz (x) ^ 31) |
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143 | #define ecb_ld64(x) (__builtin_clzll (x) ^ 63) |
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144 | #define ecb_ctz32(x) __builtin_ctz (x) |
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145 | #define ecb_ctz64(x) __builtin_ctzll (x) |
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146 | #define ecb_popcount32(x) __builtin_popcount (x) |
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147 | /* no popcountll */ |
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148 | #else |
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149 | ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
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150 | ecb_function_ int |
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151 | ecb_ctz32 (uint32_t x) |
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152 | { |
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153 | int r = 0; |
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154 | |
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155 | x &= ~x + 1; /* this isolates the lowest bit */ |
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156 | |
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157 | #if ECB_branchless_on_i386 |
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158 | r += !!(x & 0xaaaaaaaa) << 0; |
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159 | r += !!(x & 0xcccccccc) << 1; |
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160 | r += !!(x & 0xf0f0f0f0) << 2; |
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161 | r += !!(x & 0xff00ff00) << 3; |
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162 | r += !!(x & 0xffff0000) << 4; |
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163 | #else |
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164 | if (x & 0xaaaaaaaa) r += 1; |
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165 | if (x & 0xcccccccc) r += 2; |
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166 | if (x & 0xf0f0f0f0) r += 4; |
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167 | if (x & 0xff00ff00) r += 8; |
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168 | if (x & 0xffff0000) r += 16; |
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169 | #endif |
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170 | |
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171 | return r; |
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172 | } |
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173 | |
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174 | ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const; |
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175 | ecb_function_ int |
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176 | ecb_ctz64 (uint64_t x) |
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177 | { |
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178 | int shift = x & 0xffffffffU ? 0 : 32; |
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179 | return ecb_ctz32 (x >> shift) + shift; |
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180 | } |
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181 | |
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182 | ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
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183 | ecb_function_ int |
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184 | ecb_popcount32 (uint32_t x) |
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185 | { |
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186 | x -= (x >> 1) & 0x55555555; |
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187 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
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188 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
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189 | x *= 0x01010101; |
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190 | |
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191 | return x >> 24; |
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192 | } |
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193 | |
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194 | /* you have the choice beetween something with a table lookup, */ |
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195 | /* something using lots of bit arithmetic and a simple loop */ |
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196 | /* we went for the loop */ |
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197 | ecb_function_ int ecb_ld32 (uint32_t x) ecb_const; |
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198 | ecb_function_ int ecb_ld32 (uint32_t x) |
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199 | { |
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200 | int r = 0; |
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201 | |
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202 | if (x >> 16) { x >>= 16; r += 16; } |
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203 | if (x >> 8) { x >>= 8; r += 8; } |
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204 | if (x >> 4) { x >>= 4; r += 4; } |
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205 | if (x >> 2) { x >>= 2; r += 2; } |
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206 | if (x >> 1) { r += 1; } |
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207 | |
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208 | return r; |
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209 | } |
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210 | |
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211 | ecb_function_ int ecb_ld64 (uint64_t x) ecb_const; |
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212 | ecb_function_ int ecb_ld64 (uint64_t x) |
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213 | { |
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214 | int r = 0; |
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215 | |
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216 | if (x >> 32) { x >>= 32; r += 32; } |
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217 | |
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218 | return r + ecb_ld32 (x); |
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219 | } |
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220 | #endif |
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221 | |
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222 | /* popcount64 is only available on 64 bit cpus as gcc builtin */ |
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223 | /* so for this version we are lazy */ |
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224 | ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const; |
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225 | ecb_function_ int |
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226 | ecb_popcount64 (uint64_t x) |
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227 | { |
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228 | return ecb_popcount32 (x) + ecb_popcount32 (x >> 32); |
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229 | } |
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230 | |
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231 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const; |
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232 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const; |
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233 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const; |
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234 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const; |
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235 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
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236 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
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237 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const; |
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238 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const; |
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239 | |
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240 | ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); } |
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241 | ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); } |
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242 | ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); } |
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243 | ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); } |
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244 | ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); } |
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245 | ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); } |
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246 | ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); } |
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247 | ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); } |
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248 | |
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249 | #if ECB_GCC_VERSION(4,3) |
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250 | #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16) |
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251 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
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252 | #define ecb_bswap64(x) __builtin_bswap64 (x) |
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253 | #else |
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254 | ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const; |
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255 | ecb_function_ uint16_t |
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256 | ecb_bswap16 (uint16_t x) |
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257 | { |
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258 | return ecb_rotl16 (x, 8); |
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259 | } |
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260 | |
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261 | ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
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262 | ecb_function_ uint32_t |
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263 | ecb_bswap32 (uint32_t x) |
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264 | { |
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265 | return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16); |
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266 | } |
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267 | |
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268 | ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const; |
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269 | ecb_function_ uint64_t |
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270 | ecb_bswap64 (uint64_t x) |
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271 | { |
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272 | return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32); |
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273 | } |
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274 | #endif |
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275 | |
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276 | #if ECB_GCC_VERSION(4,5) |
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277 | #define ecb_unreachable() __builtin_unreachable () |
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278 | #else |
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279 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
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280 | ecb_function_ void ecb_unreachable (void) ecb_noreturn; |
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281 | ecb_function_ void ecb_unreachable (void) { } |
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282 | #endif |
100 | |
283 | |
101 | /* try to tell the compiler that some condition is definitely true */ |
284 | /* try to tell the compiler that some condition is definitely true */ |
102 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
285 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
103 | |
286 | |
104 | /* count trailing zero bits and count # of one bits */ |
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105 | #if ECB_GCC_VERSION(3,4) |
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106 | #define ecb_ctz32(x) __builtin_ctz (x) |
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107 | #define ecb_popcount32(x) __builtin_popcount (x) |
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108 | #else |
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109 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
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110 | ECB_HEADER_INLINE |
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111 | ecb_ctz32 (uint32_t x) |
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112 | { |
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113 | int r = 0; |
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114 | |
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115 | x &= -x; /* this isolates the lowest bit */ |
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116 | |
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117 | if (x & 0xaaaaaaaa) r += 1; |
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118 | if (x & 0xcccccccc) r += 2; |
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119 | if (x & 0xf0f0f0f0) r += 4; |
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120 | if (x & 0xff00ff00) r += 8; |
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121 | if (x & 0xffff0000) r += 16; |
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122 | |
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123 | return r; |
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124 | } |
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125 | |
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126 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; |
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127 | ECB_HEADER_INLINE |
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128 | ecb_popcount32 (uint32_t x) |
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129 | { |
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130 | x -= (x >> 1) & 0x55555555; |
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131 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
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132 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
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133 | x *= 0x01010101; |
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134 | |
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135 | return x >> 24; |
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136 | } |
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137 | #endif |
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138 | |
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139 | #if ECB_GCC_VERSION(4,3) |
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140 | # define ecb_bswap32(x) __builtin_bswap32 (x) |
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141 | # define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
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142 | #else |
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143 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
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144 | ECB_HEADER_INLINE uint32_t |
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145 | ecb_bswap32 (uint32_t x) |
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146 | { |
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147 | return (x >> 24) |
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148 | | ((x >> 8) & 0x0000ff00) |
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149 | | ((x << 8) & 0x00ff0000) |
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150 | | (x << 24); |
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151 | } |
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152 | |
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153 | ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const; |
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154 | ECB_HEADER_INLINE uint32_t |
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155 | ecb_bswap16 (uint32_t x) |
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156 | { |
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157 | return ((x >> 8) & 0xff) |
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158 | | ((x << 8) & 0x00ff0000) |
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159 | | (x << 24); |
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160 | } |
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161 | #endif |
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162 | |
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163 | #if ECB_GCC_VERSION(4,5) |
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164 | # define ecb_unreachable() __builtin_unreachable () |
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165 | #else |
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166 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
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167 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
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168 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
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169 | #endif |
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170 | |
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171 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; |
287 | ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; |
172 | ECB_HEADER_INLINE unsigned char |
288 | ecb_function_ unsigned char |
173 | ecb_byteorder_helper (void) |
289 | ecb_byteorder_helper (void) |
174 | { |
290 | { |
175 | const uint32_t u = 0x11223344; |
291 | const uint32_t u = 0x11223344; |
176 | return *(unsigned char *)&u; |
292 | return *(unsigned char *)&u; |
177 | } |
293 | } |
178 | |
294 | |
179 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; |
295 | ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; |
180 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; |
296 | ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
181 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; |
297 | ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; |
182 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; |
298 | ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
183 | |
299 | |
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300 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
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301 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
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302 | #else |
184 | #define ecb_mod(m, n) ((m) < 0 ? ((n) - (-(m) % (n))) : ((m) % (n))) |
303 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
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304 | #endif |
185 | |
305 | |
186 | #if ecb_cplusplus_does_not_suck |
306 | #if ecb_cplusplus_does_not_suck |
187 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
307 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
188 | template<typename T, int N> |
308 | template<typename T, int N> |
189 | static inline int ecb_array_length (const T (&arr)[N]) |
309 | static inline int ecb_array_length (const T (&arr)[N]) |
190 | { |
310 | { |
191 | return N; |
311 | return N; |
192 | } |
312 | } |
193 | #else |
313 | #else |
194 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
314 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
195 | #endif |
315 | #endif |
196 | |
316 | |
197 | ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
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198 | ECB_INLINE uint32_t |
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199 | ecb_rotr32 (uint32_t x, unsigned int count) |
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200 | { |
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201 | return (x << (32 - count)) | (x >> count); |
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202 | } |
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203 | |
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204 | ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
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205 | ECB_INLINE uint32_t |
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206 | ecb_rotl32 (uint32_t x, unsigned int count) |
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207 | { |
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208 | return (x >> (32 - count)) | (x << count); |
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209 | } |
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210 | |
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211 | #endif |
317 | #endif |
212 | |
318 | |