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| 21 | */ |
21 | */ |
| 22 | |
22 | |
| 23 | #ifndef COMPILER_H |
23 | #ifndef COMPILER_H |
| 24 | #define COMPILER_H |
24 | #define COMPILER_H |
| 25 | |
25 | |
| 26 | #define GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
26 | // this was the origin of libecb, which is now it's own library |
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27 | #include "ecb.h" |
| 27 | |
28 | |
| 28 | #if GCC_VERSION(3,0) |
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| 29 | # define attribute(attrlist) __attribute__(attrlist) |
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| 30 | #else |
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| 31 | # define attribute(attrlist) |
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| 32 | #endif |
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| 33 | |
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| 34 | #if GCC_VERSION(3,1) |
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| 35 | # define is_constant(c) __builtin_constant_p (c) |
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| 36 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
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| 37 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
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| 38 | # define noinline __attribute__((__noinline__)) |
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| 39 | #else |
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| 40 | # define is_constant(c) 0 |
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| 41 | # define expect(expr,value) (expr) |
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| 42 | # define prefetch(addr,rw,locality) |
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| 43 | # define noinline |
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| 44 | #endif |
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| 45 | |
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| 46 | #define func_const attribute ((const)) |
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| 47 | #define func_pure attribute ((pure)) |
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| 48 | #define func_hot attribute ((hot)) // 4.x |
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| 49 | #define func_cold attribute ((cold)) // 4.x |
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| 50 | |
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| 51 | #if GCC_VERSION(4,5) |
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| 52 | # define unreachable() __builtin_unreachable () |
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| 53 | #else |
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| 54 | // this seems to work fine, but gcc always emits a warning for it :/ |
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| 55 | static inline void unreachable () attribute ((noreturn)); |
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| 56 | static inline void unreachable () { } |
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| 57 | #endif |
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| 58 | |
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| 59 | // put into ifs if you are very sure that the expression |
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| 60 | // is mostly true or mosty false. note that these return |
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| 61 | // booleans, not the expression. |
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| 62 | #define expect_false(expr) expect ((expr) ? 1 : 0, 0) |
29 | #define expect_false(expr) ecb_expect_false (expr) |
| 63 | #define expect_true(expr) expect ((expr) ? 1 : 0, 1) |
30 | #define expect_true(expr) ecb_expect_true (expr) |
| 64 | |
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| 65 | // try to tell the compiler that some condition is definitely true |
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| 66 | #define assume(cond) do { if (!(cond)) unreachable (); } while (0) |
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| 67 | |
31 | |
| 68 | #endif |
32 | #endif |
| 69 | |
33 | |
