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