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