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