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: |
… | |
… | |
53 | typedef _Bool ecb_bool; |
53 | typedef _Bool ecb_bool; |
54 | # else |
54 | # else |
55 | # define ECB_INLINE inline /* yeah! */ |
55 | # define ECB_INLINE inline /* yeah! */ |
56 | typedef int ecb_bool; |
56 | typedef int ecb_bool; |
57 | # endif |
57 | # endif |
|
|
58 | #else |
|
|
59 | # define ECB_INLINE inline |
|
|
60 | typedef bool ecb_bool; |
58 | #endif |
61 | #endif |
59 | |
62 | |
60 | #define ECB_CONCAT_(a, b) a ## b |
63 | #define ECB_CONCAT_(a, b) a ## b |
61 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
64 | #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) |
62 | #define ECB_STRINGIFY_(a) # a |
65 | #define ECB_STRINGIFY_(a) # a |
… | |
… | |
64 | |
67 | |
65 | #define ECB_HEADER_INLINE static ECB_INLINE |
68 | #define ECB_HEADER_INLINE static ECB_INLINE |
66 | |
69 | |
67 | #if ECB_GCC_VERSION(3,1) |
70 | #if ECB_GCC_VERSION(3,1) |
68 | # define ecb_attribute(attrlist) __attribute__(attrlist) |
71 | # define ecb_attribute(attrlist) __attribute__(attrlist) |
69 | # define ecb_is_constant(c) __builtin_constant_p (c) |
72 | # define ecb_is_constant(expr) __builtin_constant_p (expr) |
70 | # define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
73 | # define ecb_expect(expr,value) __builtin_expect ((expr),(value)) |
71 | # define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
74 | # define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
72 | #else |
75 | #else |
73 | # define ecb_attribute(attrlist) |
76 | # define ecb_attribute(attrlist) |
74 | # define ecb_is_constant(c) 0 |
77 | # define ecb_is_constant(expr) 0 |
75 | # define ecb_expect(expr,value) (expr) |
78 | # define ecb_expect(expr,value) (expr) |
76 | # define ecb_prefetch(addr,rw,locality) |
79 | # define ecb_prefetch(addr,rw,locality) |
77 | #endif |
80 | #endif |
78 | |
81 | |
79 | /* no emulation for ecb_decltype */ |
82 | /* no emulation for ecb_decltype */ |
… | |
… | |
81 | # define ecb_decltype(x) __decltype(x) |
84 | # define ecb_decltype(x) __decltype(x) |
82 | #elif ECB_GCC_VERSION(3,0) |
85 | #elif ECB_GCC_VERSION(3,0) |
83 | # define ecb_decltype(x) typeof(x) |
86 | # define ecb_decltype(x) typeof(x) |
84 | #endif |
87 | #endif |
85 | |
88 | |
|
|
89 | #define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */ |
86 | #define ecb_noinline ecb_attribute ((noinline)) |
90 | #define ecb_noinline ecb_attribute ((__noinline__)) |
87 | #define ecb_noreturn ecb_attribute ((noreturn)) |
91 | #define ecb_noreturn ecb_attribute ((__noreturn__)) |
88 | #define ecb_unused ecb_attribute ((unused)) |
92 | #define ecb_unused ecb_attribute ((__unused__)) |
89 | #define ecb_const ecb_attribute ((const)) |
93 | #define ecb_const ecb_attribute ((__const__)) |
90 | #define ecb_pure ecb_attribute ((pure)) |
94 | #define ecb_pure ecb_attribute ((__pure__)) |
91 | #define ecb_hot ecb_attribute ((hot)) /* 4.3 */ |
95 | #define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */ |
92 | #define ecb_cold ecb_attribute ((cold)) /* 4.3 */ |
96 | #define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */ |
93 | |
97 | |
94 | /* put into ifs if you are very sure that the expression */ |
98 | /* put into if's if you are very sure that the expression */ |
95 | /* is mostly true or mosty false. note that these return */ |
99 | /* is mostly true or mosty false. note that these return */ |
96 | /* booleans, not the expression. */ |
100 | /* booleans, not the expression. */ |
97 | #define ecb_unlikely(expr) ecb_expect (!!(expr), 0) |
101 | #define ecb_unlikely(expr) ecb_expect (!!(expr), 0) |
98 | #define ecb_likely(expr) ecb_expect (!!(expr), 1) |
102 | #define ecb_likely(expr) ecb_expect (!!(expr), 1) |
99 | |
103 | |
100 | /* try to tell the compiler that some condition is definitely true */ |
104 | /* try to tell the compiler that some condition is definitely true */ |
101 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
105 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
102 | |
106 | |
103 | /* count trailing zero bits and count # of one bits */ |
107 | /* count trailing zero bits and count # of one bits */ |
104 | #if ECB_GCC_VERSION(3,4) |
108 | #if ECB_GCC_VERSION(3,4) |
105 | #define ecb_ctz32 (x) __builtin_ctz (x) |
109 | #define ecb_ctz32(x) __builtin_ctz (x) |
106 | #define ecb_popcount32 (x) __builtin_popcount (x) |
110 | #define ecb_popcount32(x) __builtin_popcount (x) |
107 | #else |
111 | #else |
108 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
112 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
109 | ECB_HEADER_INLINE |
113 | ECB_HEADER_INLINE |
110 | ecb_ctz32 (uint32_t x) |
114 | ecb_ctz32 (uint32_t x) |
111 | { |
115 | { |
… | |
… | |
135 | } |
139 | } |
136 | #endif |
140 | #endif |
137 | |
141 | |
138 | #if ECB_GCC_VERSION(4,3) |
142 | #if ECB_GCC_VERSION(4,3) |
139 | # define ecb_bswap32(x) __builtin_bswap32 (x) |
143 | # define ecb_bswap32(x) __builtin_bswap32 (x) |
|
|
144 | # define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) |
140 | #else |
145 | #else |
141 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
146 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
142 | ECB_HEADER_INLINE uint32_t |
147 | ECB_HEADER_INLINE uint32_t |
143 | ecb_bswap32 (uint32_t x) |
148 | ecb_bswap32 (uint32_t x) |
144 | { |
149 | { |
145 | return (x >> 24) |
150 | return (x >> 24) |
146 | | ((x >> 8) & 0x0000ff00) |
151 | | ((x >> 8) & 0x0000ff00) |
147 | | ((x << 8) & 0x00ff0000) |
152 | | ((x << 8) & 0x00ff0000) |
148 | | (x << 24); |
153 | | (x << 24); |
149 | } |
154 | } |
|
|
155 | |
|
|
156 | ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const; |
|
|
157 | ECB_HEADER_INLINE uint32_t |
|
|
158 | ecb_bswap16 (uint32_t x) |
|
|
159 | { |
|
|
160 | return ((x >> 8) & 0xff) |
|
|
161 | | ((x << 8) & 0x00ff0000) |
|
|
162 | | (x << 24); |
|
|
163 | } |
150 | #endif |
164 | #endif |
151 | |
165 | |
152 | #if ECB_GCC_VERSION(4,5) |
166 | #if ECB_GCC_VERSION(4,5) |
153 | # define ecb_unreachable() __builtin_unreachable () |
167 | # define ecb_unreachable() __builtin_unreachable () |
154 | #else |
168 | #else |
155 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
169 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
156 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
170 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
157 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
171 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
158 | #endif |
172 | #endif |
159 | |
173 | |
160 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const; |
174 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; |
161 | ECB_HEADER_INLINE unsigned char |
175 | ECB_HEADER_INLINE unsigned char |
162 | ecb_byteorder_helper () |
176 | ecb_byteorder_helper (void) |
163 | { |
177 | { |
164 | const uint32_t u = 0x11223344; |
178 | const uint32_t u = 0x11223344; |
165 | return *(unsigned char *)&u; |
179 | return *(unsigned char *)&u; |
166 | } |
180 | } |
167 | |
181 | |
168 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () ecb_const; |
182 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; |
169 | ECB_HEADER_INLINE ecb_bool ecb_big_endian () { return ecb_byteorder_helper () == 0x11; }; |
183 | ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; |
170 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () ecb_const; |
184 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; |
171 | ECB_HEADER_INLINE ecb_bool ecb_little_endian () { return ecb_byteorder_helper () == 0x44; }; |
185 | ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; |
|
|
186 | |
|
|
187 | #if ECB_GCC_VERSION(3,0) |
|
|
188 | # define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0)) |
|
|
189 | #else |
|
|
190 | # define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n))) |
|
|
191 | #endif |
172 | |
192 | |
173 | #if ecb_cplusplus_does_not_suck |
193 | #if ecb_cplusplus_does_not_suck |
174 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
194 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
175 | template<typename T, int N> |
195 | template<typename T, int N> |
176 | static inline int ecb_array_length (const T (&arr)[N]) |
196 | static inline int ecb_array_length (const T (&arr)[N]) |