1 | /* |
1 | /* |
2 | * 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> |
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5 | * Copyright (©) 2011 Emanuele Giaquinta |
5 | * All rights reserved. |
6 | * All rights reserved. |
6 | * |
7 | * |
7 | * 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- |
8 | * tion, are permitted provided that the following conditions are met: |
9 | * tion, are permitted provided that the following conditions are met: |
9 | * |
10 | * |
… | |
… | |
27 | */ |
28 | */ |
28 | |
29 | |
29 | #ifndef ECB_H |
30 | #ifndef ECB_H |
30 | #define ECB_H |
31 | #define ECB_H |
31 | |
32 | |
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33 | #include <inttypes.h> |
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34 | |
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35 | /* many compilers define _GNUC_ to some versions but then only implement |
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36 | * what their idiot authors think are the "more important" extensions, |
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37 | * causing enourmous grief in return for some better fake benchmark numbers. |
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38 | * or so. |
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39 | * we try to detect these and simply assume they are not gcc - if they have |
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40 | * an issue with that they should have done it right in the first place. |
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41 | */ |
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42 | #ifndef ECB_GCC_VERSION |
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43 | #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) |
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44 | #define ECB_GCC_VERSION(major,minor) 0 |
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45 | #else |
32 | #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
46 | #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
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47 | #endif |
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48 | #endif |
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49 | |
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50 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
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51 | |
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52 | #if __cplusplus |
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53 | #define ECB_INLINE static inline |
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54 | #elif ECB_GCC_VERSION(2,5) |
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55 | #define ECB_INLINE static __inline__ |
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56 | #elif ECB_C99 |
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57 | #define ECB_INLINE static inline |
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58 | #else |
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59 | #define ECB_INLINE static |
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60 | #endif |
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61 | |
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62 | #if ECB_GCC_VERSION(3,3) |
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63 | #define ecb_restrict __restrict__ |
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64 | #elif ECB_C99 |
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65 | #define ecb_restrict restrict |
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66 | #else |
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67 | #define ecb_restrict |
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68 | #endif |
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69 | |
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70 | typedef int ecb_bool; |
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71 | |
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72 | #define ECB_CONCAT_(a, b) a ## b |
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73 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
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74 | #define ECB_STRINGIFY_(a) # a |
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75 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
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76 | |
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77 | #define ecb_function_ ECB_INLINE |
33 | |
78 | |
34 | #if ECB_GCC_VERSION(3,1) |
79 | #if ECB_GCC_VERSION(3,1) |
35 | # define ecb_attribute(attrlist) __attribute__(attrlist) |
80 | #define ecb_attribute(attrlist) __attribute__(attrlist) |
36 | # define ecb_is_constant(c) __builtin_constant_p (c) |
81 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
37 | # define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
82 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
38 | # define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
83 | #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
39 | #else |
84 | #else |
40 | # define ecb_attribute(attrlist) |
85 | #define ecb_attribute(attrlist) |
41 | # define ecb_is_constant(c) 0 |
86 | #define ecb_is_constant(expr) 0 |
42 | # define ecb_expect(expr,value) (expr) |
87 | #define ecb_expect(expr,value) (expr) |
43 | # define ecb_prefetch(addr,rw,locality) |
88 | #define ecb_prefetch(addr,rw,locality) |
44 | #endif |
89 | #endif |
45 | |
90 | |
46 | /* no emulation for ecb_decltype */ |
91 | /* no emulation for ecb_decltype */ |
47 | #if ECB_GCC_VERSION(4,5) |
92 | #if ECB_GCC_VERSION(4,5) |
48 | # define ecb_decltype(x) __decltype(x) |
93 | #define ecb_decltype(x) __decltype(x) |
49 | #elif ECB_GCC_VERSION(3,0) |
94 | #elif ECB_GCC_VERSION(3,0) |
50 | # define ecb_decltype(x) typeof(x) |
95 | #define ecb_decltype(x) __typeof(x) |
51 | #endif |
96 | #endif |
52 | |
97 | |
53 | #define ecb_noinline ecb_attribute ((noinline)) |
98 | #define ecb_noinline ecb_attribute ((__noinline__)) |
54 | #define ecb_noreturn ecb_attribute ((noreturn)) |
99 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
55 | #define ecb_unused ecb_attribute ((unused)) |
100 | #define ecb_unused ecb_attribute ((__unused__)) |
56 | #define ecb_const ecb_attribute ((const)) |
101 | #define ecb_const ecb_attribute ((__const__)) |
57 | #define ecb_pure ecb_attribute ((pure)) |
102 | #define ecb_pure ecb_attribute ((__pure__)) |
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103 | |
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104 | #if ECB_GCC_VERSION(4,3) |
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105 | #define ecb_artificial ecb_attribute ((__artificial__)) |
58 | #define ecb_hot ecb_attribute ((hot)) // 4.3 |
106 | #define ecb_hot ecb_attribute ((__hot__)) |
59 | #define ecb_cold ecb_attribute ((cold)) // 4.3 |
107 | #define ecb_cold ecb_attribute ((__cold__)) |
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108 | #else |
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109 | #define ecb_artificial |
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110 | #define ecb_hot |
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111 | #define ecb_cold |
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112 | #endif |
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113 | |
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114 | /* put around conditional expressions if you are very sure that the */ |
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115 | /* expression is mostly true or mostly false. note that these return */ |
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116 | /* booleans, not the expression. */ |
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117 | #define ecb_expect_false(expr) ecb_expect (!!(expr), 0) |
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118 | #define ecb_expect_true(expr) ecb_expect (!!(expr), 1) |
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119 | /* for compatibility to the rest of the world */ |
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120 | #define ecb_likely(expr) ecb_expect_true (expr) |
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121 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
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122 | |
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123 | /* count trailing zero bits and count # of one bits */ |
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124 | #if ECB_GCC_VERSION(3,4) |
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125 | #define ecb_ctz32(x) __builtin_ctz (x) |
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126 | #define ecb_popcount32(x) __builtin_popcount (x) |
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127 | #else |
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128 | ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
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129 | ecb_function_ int |
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130 | ecb_ctz32 (uint32_t x) |
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131 | { |
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132 | int r = 0; |
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133 | |
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134 | x &= -x; /* this isolates the lowest bit */ |
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135 | |
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136 | if (x & 0xaaaaaaaa) r += 1; |
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137 | if (x & 0xcccccccc) r += 2; |
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138 | if (x & 0xf0f0f0f0) r += 4; |
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139 | if (x & 0xff00ff00) r += 8; |
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140 | if (x & 0xffff0000) r += 16; |
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141 | |
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142 | return r; |
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143 | } |
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144 | |
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145 | ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
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146 | ecb_function_ int |
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147 | ecb_popcount32 (uint32_t x) |
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148 | { |
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149 | x -= (x >> 1) & 0x55555555; |
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150 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
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151 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
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152 | x *= 0x01010101; |
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153 | |
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154 | return x >> 24; |
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155 | } |
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156 | #endif |
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157 | |
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158 | #if ECB_GCC_VERSION(4,3) |
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159 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
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160 | #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
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161 | #else |
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162 | ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
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163 | ecb_function_ uint32_t |
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164 | ecb_bswap32 (uint32_t x) |
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165 | { |
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166 | return (x >> 24) |
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167 | | ((x >> 8) & 0x0000ff00) |
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168 | | ((x << 8) & 0x00ff0000) |
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169 | | (x << 24); |
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170 | } |
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171 | |
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172 | ecb_function_ uint32_t ecb_bswap16 (uint32_t x) ecb_const; |
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173 | ecb_function_ uint32_t |
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174 | ecb_bswap16 (uint32_t x) |
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175 | { |
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176 | return ((x >> 8) & 0xff) |
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177 | | ((x << 8) & 0x00ff0000) |
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178 | | (x << 24); |
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179 | } |
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180 | #endif |
60 | |
181 | |
61 | #if ECB_GCC_VERSION(4,5) |
182 | #if ECB_GCC_VERSION(4,5) |
62 | # define ecb_unreachable() __builtin_unreachable () |
183 | #define ecb_unreachable() __builtin_unreachable () |
63 | #else |
184 | #else |
64 | // this seems to work fine, but gcc always emits a warning for it :/ |
185 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
65 | static inline void ecb_unreachable () ecb_attribute ((noreturn)); |
186 | ecb_function_ void ecb_unreachable (void) ecb_noreturn; |
66 | static inline void ecb_unreachable () { } |
187 | ecb_function_ void ecb_unreachable (void) { } |
67 | #endif |
188 | #endif |
68 | |
189 | |
69 | // put into ifs if you are very sure that the expression |
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70 | // is mostly true or mosty false. note that these return |
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71 | // booleans, not the expression. |
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72 | #define ecb_expect_false(expr) ecb_expect ((expr) ? 1 : 0, 0) |
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73 | #define ecb_expect_true(expr) ecb_expect ((expr) ? 1 : 0, 1) |
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74 | |
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75 | // try to tell the compiler that some condition is definitely true |
190 | /* try to tell the compiler that some condition is definitely true */ |
76 | #define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) |
191 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
77 | |
192 | |
78 | // count trailing zero bits and count # of one bits |
193 | ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; |
79 | #if ECB_GCC_VERSION(3,4) |
194 | ecb_function_ unsigned char |
80 | static inline int ecb_ctz (unsigned int x) { return __builtin_ctz (x); } |
195 | ecb_byteorder_helper (void) |
81 | static inline int ecb_popcount (unsigned int x) { return __builtin_popcount (x); } |
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82 | #else |
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83 | static int ecb_ctz (unsigned int x) ecb_const |
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84 | { |
196 | { |
85 | int r = 0; |
197 | const uint32_t u = 0x11223344; |
86 | |
198 | return *(unsigned char *)&u; |
87 | x &= -x; // this isolates the lowest bit |
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88 | |
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89 | if (x & 0xaaaaaaaa) r += 1; |
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90 | if (x & 0xcccccccc) r += 2; |
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91 | if (x & 0xf0f0f0f0) r += 4; |
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92 | if (x & 0xff00ff00) r += 8; |
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93 | if (x & 0xffff0000) r += 16; |
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94 | |
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95 | return r; |
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96 | } |
199 | } |
97 | |
200 | |
98 | static int ecb_popcount (unsigned int x) ecb_const |
201 | ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; |
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202 | ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
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203 | ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; |
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204 | ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
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205 | |
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206 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
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207 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
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208 | #else |
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209 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
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210 | #endif |
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211 | |
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212 | #if ecb_cplusplus_does_not_suck |
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213 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
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214 | template<typename T, int N> |
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215 | static inline int ecb_array_length (const T (&arr)[N]) |
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216 | { |
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217 | return N; |
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218 | } |
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219 | #else |
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220 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
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221 | #endif |
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222 | |
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223 | ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
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224 | ECB_INLINE uint32_t |
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225 | ecb_rotr32 (uint32_t x, unsigned int count) |
99 | { |
226 | { |
100 | x -= (x >> 1) & 0x55555555; |
227 | return (x << (32 - count)) | (x >> count); |
101 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
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102 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
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103 | x *= 0x01010101; |
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104 | |
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105 | return x >> 24; |
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106 | } |
228 | } |
107 | #endif |
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108 | |
229 | |
109 | #endif |
230 | ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
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231 | ECB_INLINE uint32_t |
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232 | ecb_rotl32 (uint32_t x, unsigned int count) |
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233 | { |
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234 | return (x >> (32 - count)) | (x << count); |
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235 | } |
110 | |
236 | |
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237 | #endif |
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238 | |