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 |
5 | * Copyright (©) 2011 Emanuele Giaquinta |
5 | * Copyright (©) 2011 Emanuele Giaquinta |
6 | * All rights reserved. |
6 | * All rights reserved. |
7 | * |
7 | * |
… | |
… | |
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__) |
… | |
… | |
95 | /* booleans, not the expression. */ |
96 | /* booleans, not the expression. */ |
96 | #define ecb_unlikely(expr) ecb_expect (!!(expr), 0) |
97 | #define ecb_unlikely(expr) ecb_expect (!!(expr), 0) |
97 | #define ecb_likely(expr) ecb_expect (!!(expr), 1) |
98 | #define ecb_likely(expr) ecb_expect (!!(expr), 1) |
98 | |
99 | |
99 | /* try to tell the compiler that some condition is definitely true */ |
100 | /* try to tell the compiler that some condition is definitely true */ |
100 | #define ecb_assume(cond) do { if (!(cond)) unreachable (); } while (0) |
101 | #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) |
101 | |
102 | |
102 | /* count trailing zero bits and count # of one bits */ |
103 | /* count trailing zero bits and count # of one bits */ |
103 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
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104 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; |
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105 | #if ECB_GCC_VERSION(3,4) |
104 | #if ECB_GCC_VERSION(3,4) |
106 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) { return __builtin_ctz (x); } |
105 | #define ecb_ctz32 (x) __builtin_ctz (x) |
107 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) { return __builtin_popcount (x); } |
106 | #define ecb_popcount32 (x) __builtin_popcount (x) |
108 | #else |
107 | #else |
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108 | ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; |
109 | ECB_HEADER_INLINE |
109 | ECB_HEADER_INLINE |
110 | ecb_ctz32 (uint32_t x) |
110 | ecb_ctz32 (uint32_t x) |
111 | { |
111 | { |
112 | int r = 0; |
112 | int r = 0; |
113 | |
113 | |
… | |
… | |
120 | if (x & 0xffff0000) r += 16; |
120 | if (x & 0xffff0000) r += 16; |
121 | |
121 | |
122 | return r; |
122 | return r; |
123 | } |
123 | } |
124 | |
124 | |
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125 | ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; |
125 | ECB_HEADER_INLINE |
126 | ECB_HEADER_INLINE |
126 | ecb_popcount32 (uint32_t x) |
127 | ecb_popcount32 (uint32_t x) |
127 | { |
128 | { |
128 | x -= (x >> 1) & 0x55555555; |
129 | x -= (x >> 1) & 0x55555555; |
129 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
130 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
… | |
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132 | |
133 | |
133 | return x >> 24; |
134 | return x >> 24; |
134 | } |
135 | } |
135 | #endif |
136 | #endif |
136 | |
137 | |
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138 | #if ECB_GCC_VERSION(4,3) |
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139 | # define ecb_bswap32(x) __builtin_bswap32 (x) |
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140 | #else |
137 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
141 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; |
138 | #if ECB_GCC_VERSION(4,3) |
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139 | ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) { return __builtin_bswap32 (x); } |
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140 | #else |
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141 | ECB_HEADER_INLINE uint32_t |
142 | ECB_HEADER_INLINE uint32_t |
142 | ecb_bswap32 (uint32_t x) |
143 | ecb_bswap32 (uint32_t x) |
143 | { |
144 | { |
144 | return (x >> 24) |
145 | return (x >> 24) |
145 | | ((x >> 8) & 0x0000ff00) |
146 | | ((x >> 8) & 0x0000ff00) |
146 | | ((x << 8) & 0x00ff0000) |
147 | | ((x << 8) & 0x00ff0000) |
147 | | (x << 24); |
148 | | (x << 24); |
148 | } |
149 | } |
149 | #endif |
150 | #endif |
150 | |
151 | |
151 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
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152 | #if ECB_GCC_VERSION(4,5) |
152 | #if ECB_GCC_VERSION(4,5) |
153 | ECB_HEADER_INLINE void ecb_unreachable (void) { __builtin_unreachable (); } |
153 | # define ecb_unreachable() __builtin_unreachable () |
154 | #else |
154 | #else |
155 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
155 | /* this seems to work fine, but gcc always emits a warning for it :/ */ |
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156 | ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; |
156 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
157 | ECB_HEADER_INLINE void ecb_unreachable (void) { } |
157 | #endif |
158 | #endif |
158 | |
159 | |
159 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const; |
160 | ECB_HEADER_INLINE unsigned char ecb_byteorder_helper () ecb_const; |
160 | |
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161 | ECB_HEADER_INLINE unsigned char |
161 | ECB_HEADER_INLINE unsigned char |
162 | ecb_byteorder_helper () |
162 | ecb_byteorder_helper () |
163 | { |
163 | { |
164 | const uint32_t u = 0x11223344; |
164 | const uint32_t u = 0x11223344; |
165 | return *(unsigned char *)&u; |
165 | return *(unsigned char *)&u; |