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> |
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 |
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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 for some better fake benchmark numbers or so. |
53 | * causing enourmous grief in return for some better fake benchmark numbers. |
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54 | * or so. |
38 | * 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 |
39 | * 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. |
40 | */ |
57 | */ |
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58 | #ifndef ECB_GCC_VERSION |
41 | #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__llvm__) |
59 | #if defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__) |
42 | # define ECB_GCC_VERSION(major,minor) 0 |
60 | #define ECB_GCC_VERSION(major,minor) 0 |
43 | #else |
61 | #else |
44 | # 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))) |
45 | #endif |
63 | #endif |
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64 | #endif |
46 | |
65 | |
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66 | #define ECB_C99 (__STDC_VERSION__ >= 199901L) |
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67 | |
47 | #ifndef __cplusplus |
68 | #if __cplusplus |
48 | # if __STDC_VERSION__ >= 199901L |
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49 | # define ECB_INLINE inline |
69 | #define ECB_INLINE static inline |
50 | typedef _Bool ecb_bool; |
70 | #elif ECB_GCC_VERSION(2,5) |
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71 | #define ECB_INLINE static __inline__ |
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72 | #elif ECB_C99 |
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73 | #define ECB_INLINE static inline |
51 | # else |
74 | #else |
52 | # 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 | |
53 | typedef int ecb_bool; |
86 | typedef int ecb_bool; |
54 | # endif |
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55 | #endif |
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56 | |
87 | |
57 | #define ECB_CONCAT_(a, b) a ## b |
88 | #define ECB_CONCAT_(a, b) a ## b |
58 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
89 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
59 | #define ECB_STRINGIFY_(a) # a |
90 | #define ECB_STRINGIFY_(a) # a |
60 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
91 | #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) |
61 | |
92 | |
62 | #define ECB_HEADER_INLINE static ECB_INLINE |
93 | #define ecb_function_ ECB_INLINE |
63 | |
94 | |
64 | #if ECB_GCC_VERSION(3,1) |
95 | #if ECB_GCC_VERSION(3,1) |
65 | # define ecb_attribute(attrlist) __attribute__(attrlist) |
96 | #define ecb_attribute(attrlist) __attribute__(attrlist) |
66 | # define ecb_is_constant(c) __builtin_constant_p (c) |
97 | #define ecb_is_constant(expr) __builtin_constant_p (expr) |
67 | # define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
98 | #define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
68 | # define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
99 | #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
69 | #else |
100 | #else |
70 | # define ecb_attribute(attrlist) |
101 | #define ecb_attribute(attrlist) |
71 | # define ecb_is_constant(c) 0 |
102 | #define ecb_is_constant(expr) 0 |
72 | # define ecb_expect(expr,value) (expr) |
103 | #define ecb_expect(expr,value) (expr) |
73 | # define ecb_prefetch(addr,rw,locality) |
104 | #define ecb_prefetch(addr,rw,locality) |
74 | #endif |
105 | #endif |
75 | |
106 | |
76 | /* no emulation for ecb_decltype */ |
107 | /* no emulation for ecb_decltype */ |
77 | #if ECB_GCC_VERSION(4,5) |
108 | #if ECB_GCC_VERSION(4,5) |
78 | # define ecb_decltype(x) __decltype(x) |
109 | #define ecb_decltype(x) __decltype(x) |
79 | #elif ECB_GCC_VERSION(3,0) |
110 | #elif ECB_GCC_VERSION(3,0) |
80 | # define ecb_decltype(x) typeof(x) |
111 | #define ecb_decltype(x) __typeof(x) |
81 | #endif |
112 | #endif |
82 | |
113 | |
83 | #define ecb_noinline ecb_attribute ((noinline)) |
114 | #define ecb_noinline ecb_attribute ((__noinline__)) |
84 | #define ecb_noreturn ecb_attribute ((noreturn)) |
115 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
85 | #define ecb_unused ecb_attribute ((unused)) |
116 | #define ecb_unused ecb_attribute ((__unused__)) |
86 | #define ecb_const ecb_attribute ((const)) |
117 | #define ecb_const ecb_attribute ((__const__)) |
87 | #define ecb_pure ecb_attribute ((pure)) |
118 | #define ecb_pure ecb_attribute ((__pure__)) |
88 | #define ecb_hot ecb_attribute ((hot)) /* 4.3 */ |
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89 | #define ecb_cold ecb_attribute ((cold)) /* 4.3 */ |
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90 | |
119 | |
91 | #if ECB_GCC_VERSION(4,5) |
120 | #if ECB_GCC_VERSION(4,3) |
92 | # define ecb_unreachable() __builtin_unreachable () |
121 | #define ecb_artificial ecb_attribute ((__artificial__)) |
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122 | #define ecb_hot ecb_attribute ((__hot__)) |
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123 | #define ecb_cold ecb_attribute ((__cold__)) |
93 | #else |
124 | #else |
94 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
125 | #define ecb_artificial |
95 | ECB_HEADER_INLINE void ecb_unreachable () ecb_attribute ((noreturn)); |
126 | #define ecb_hot |
96 | ECB_HEADER_INLINE void ecb_unreachable () { } |
127 | #define ecb_cold |
97 | #endif |
128 | #endif |
98 | |
129 | |
99 | /* put into ifs if you are very sure that the expression */ |
130 | /* put around conditional expressions if you are very sure that the */ |
100 | /* is mostly true or mosty false. note that these return */ |
131 | /* expression is mostly true or mostly false. note that these return */ |
101 | /* booleans, not the expression. */ |
132 | /* booleans, not the expression. */ |
102 | #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 */ |
103 | #define ecb_likely(expr) ecb_expect (!!(expr), 1) |
136 | #define ecb_likely(expr) ecb_expect_true (expr) |
104 | |
137 | #define ecb_unlikely(expr) ecb_expect_false (expr) |
105 | /* try to tell the compiler that some condition is definitely true */ |
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106 | #define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) |
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107 | |
138 | |
108 | /* count trailing zero bits and count # of one bits */ |
139 | /* count trailing zero bits and count # of one bits */ |
109 | #if ECB_GCC_VERSION(3,4) |
140 | #if ECB_GCC_VERSION(3,4) |
110 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } |
141 | #define ecb_ctz32(x) __builtin_ctz (x) |
111 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } |
142 | #define ecb_popcount32(x) __builtin_popcount (x) |
112 | #else |
143 | #else |
113 | ECB_HEADER_INLINE |
144 | ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const; |
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145 | ecb_function_ int |
114 | ecb_ctz32 (uint32_t x) ecb_const |
146 | ecb_ctz32 (uint32_t x) |
115 | { |
147 | { |
116 | int r = 0; |
148 | int r = 0; |
117 | |
149 | |
118 | x &= -x; /* this isolates the lowest bit */ |
150 | x &= -x; /* this isolates the lowest bit */ |
119 | |
151 | |
120 | if (x & 0xaaaaaaaa) r += 1; |
152 | if (x & 0xaaaaaaaa) r += 1; |
121 | if (x & 0xcccccccc) r += 2; |
153 | if (x & 0xcccccccc) r += 2; |
122 | if (x & 0xf0f0f0f0) r += 4; |
154 | if (x & 0xf0f0f0f0) r += 4; |
123 | if (x & 0xff00ff00) r += 8; |
155 | if (x & 0xff00ff00) r += 8; |
124 | if (x & 0xffff0000) r += 16; |
156 | if (x & 0xffff0000) r += 16; |
125 | |
157 | |
126 | return r; |
158 | return r; |
127 | } |
159 | } |
128 | |
160 | |
129 | ECB_HEADER_INLINE |
161 | ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const; |
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162 | ecb_function_ int |
130 | ecb_popcount32 (uint32_t x) ecb_const |
163 | ecb_popcount32 (uint32_t x) |
131 | { |
164 | { |
132 | x -= (x >> 1) & 0x55555555; |
165 | x -= (x >> 1) & 0x55555555; |
133 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
166 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
134 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
167 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
135 | x *= 0x01010101; |
168 | x *= 0x01010101; |
136 | |
169 | |
137 | return x >> 24; |
170 | return x >> 24; |
138 | } |
171 | } |
139 | #endif |
172 | #endif |
140 | |
173 | |
141 | ECB_HEADER_INLINE unsigned char |
174 | #if ECB_GCC_VERSION(4,3) |
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175 | #define ecb_bswap32(x) __builtin_bswap32 (x) |
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176 | #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
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177 | #else |
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178 | ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
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179 | ecb_function_ uint32_t |
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180 | ecb_bswap32 (uint32_t x) |
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181 | { |
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182 | return (x >> 24) |
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183 | | ((x >> 8) & 0x0000ff00) |
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184 | | ((x << 8) & 0x00ff0000) |
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185 | | (x << 24); |
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186 | } |
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187 | |
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188 | ecb_function_ uint32_t ecb_bswap16 (uint32_t x) ecb_const; |
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189 | ecb_function_ uint32_t |
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190 | ecb_bswap16 (uint32_t x) |
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191 | { |
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192 | return ((x >> 8) & 0xff) |
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193 | | ((x << 8) & 0x00ff0000) |
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194 | | (x << 24); |
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195 | } |
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196 | #endif |
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197 | |
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198 | #if ECB_GCC_VERSION(4,5) |
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199 | #define ecb_unreachable() __builtin_unreachable () |
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200 | #else |
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201 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
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202 | ecb_function_ void ecb_unreachable (void) ecb_noreturn; |
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203 | ecb_function_ void ecb_unreachable (void) { } |
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204 | #endif |
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205 | |
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206 | /* try to tell the compiler that some condition is definitely true */ |
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207 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
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208 | |
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209 | ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const; |
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210 | ecb_function_ unsigned char |
142 | ecb_byteorder_helper () ecb_const |
211 | ecb_byteorder_helper (void) |
143 | { |
212 | { |
144 | const uint32_t u = 0x11223344; |
213 | const uint32_t u = 0x11223344; |
145 | return *(unsigned char *)&u; |
214 | return *(unsigned char *)&u; |
146 | } |
215 | } |
147 | |
216 | |
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217 | ecb_function_ ecb_bool ecb_big_endian (void) ecb_const; |
148 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const { return ecb_byteorder_helper () == 0x11; }; |
218 | ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; } |
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219 | ecb_function_ ecb_bool ecb_little_endian (void) ecb_const; |
149 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const { return ecb_byteorder_helper () == 0x44; }; |
220 | ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; } |
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221 | |
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222 | #if ECB_GCC_VERSION(3,0) || ECB_C99 |
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223 | #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
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224 | #else |
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225 | #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
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226 | #endif |
150 | |
227 | |
151 | #if ecb_cplusplus_does_not_suck |
228 | #if ecb_cplusplus_does_not_suck |
152 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
229 | /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */ |
153 | template<typename T, int N> |
230 | template<typename T, int N> |
154 | static inline int ecb_array_length (const T (&arr)[N]) |
231 | static inline int ecb_array_length (const T (&arr)[N]) |
155 | { |
232 | { |
156 | return N; |
233 | return N; |
157 | } |
234 | } |
158 | #else |
235 | #else |
159 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
236 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
160 | #endif |
237 | #endif |
161 | |
238 | |
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239 | ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; |
162 | ECB_INLINE uint32_t |
240 | ECB_INLINE uint32_t |
163 | ecb_rotr32 (uint32_t x, unsigned int count) |
241 | ecb_rotr32 (uint32_t x, unsigned int count) |
164 | { |
242 | { |
165 | return (x << (32 - count)) | (x >> count); |
243 | return (x << (32 - count)) | (x >> count); |
166 | } |
244 | } |
167 | |
245 | |
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246 | ECB_INLINE uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const; |
168 | ECB_INLINE uint32_t |
247 | ECB_INLINE uint32_t |
169 | ecb_rotl32 (uint32_t x, unsigned int count) |
248 | ecb_rotl32 (uint32_t x, unsigned int count) |
170 | { |
249 | { |
171 | return (x >> (32 - count)) | (x << count); |
250 | return (x >> (32 - count)) | (x << count); |
172 | } |
251 | } |
173 | |
252 | |
174 | #if ECB_GCC_VERSION(4,3) |
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175 | ECB_GCC_VERSION uint32_t ecb_bswap32 (uint32_t x) { return __builtin_bswap32 (x); } |
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176 | #else |
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177 | ECB_GCC_VERSION uint32_t |
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178 | ecb_bswap32 (uint32_t x) |
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179 | { |
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180 | return (x >> 24) |
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181 | | ((x >> 8) & 0x0000ff00) |
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182 | | ((x << 8) & 0x00ff0000) |
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183 | | (x << 24); |
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184 | } |
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185 | #endif |
253 | #endif |
186 | |
254 | |
187 | #endif |
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188 | |
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