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1 | |
2 | #ifdef __GNUC__ |
3 | # define likely(x) __builtin_expect((x),1) |
4 | # define unlikely(x) __builtin_expect((x),0) |
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5 | # define preload __builtin_prefetch |
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6 | # ifdef __clang__ |
7 | # define noinline __attribute__((noinline)) |
8 | # else |
9 | # define noinline __attribute__((noinline,noclone)) |
10 | # endif |
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11 | # define attr_unused __attribute__((unused)) |
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12 | #else |
13 | # define likely(x) (x) |
14 | # define unlikely(x) (x) |
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15 | # define preload (x) |
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16 | # define noinline |
0b1633d7 |
17 | # define attr_unused |
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18 | #endif |
19 | |
20 | // doesn't work on Android, mingw... |
21 | #if defined(__GNUC__) && !defined(ANDROID) && !defined(__MINGW32__) |
22 | # define attr_weak __attribute__((weak)) |
23 | #else |
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24 | # define attr_weak |
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25 | #endif |
26 | |
27 | #ifndef __has_builtin |
28 | #define __has_builtin(x) 0 |
29 | #endif |
30 | |
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31 | #if __has_builtin(__builtin_add_overflow) || (defined(__GNUC__) && __GNUC__ >= 5) |
32 | #define add_overflow(a, b, r) __builtin_add_overflow(a, b, &(r)) |
33 | #define sub_overflow(a, b, r) __builtin_sub_overflow(a, b, &(r)) |
34 | #else |
35 | #define add_overflow(a, b, r) ({r = (u32)a + (u32)b; (a ^ ~b) & (a ^ r) & (1u<<31);}) |
36 | #define sub_overflow(a, b, r) ({r = (u32)a - (u32)b; (a ^ b) & (a ^ r) & (1u<<31);}) |
37 | #endif |
38 | |