| 1 | #ifndef _TOOLS_MATH_H |
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| 2 | #define _TOOLS_MATH_H |
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| 3 | |
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| 4 | /* |
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| 5 | * This looks more complex than it should be. But we need to |
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| 6 | * get the type for the ~ right in round_down (it needs to be |
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| 7 | * as wide as the result!), and we want to evaluate the macro |
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| 8 | * arguments just once each. |
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| 9 | */ |
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| 10 | #define __round_mask(x, y) ((__typeof__(x))((y)-1)) |
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| 11 | #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) |
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| 12 | #define round_down(x, y) ((x) & ~__round_mask(x, y)) |
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| 13 | |
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| 14 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
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| 15 | |
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| 16 | #ifndef roundup |
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| 17 | #define roundup(x, y) ( \ |
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| 18 | { \ |
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| 19 | const typeof(y) __y = y; \ |
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| 20 | (((x) + (__y - 1)) / __y) * __y; \ |
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| 21 | } \ |
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| 22 | ) |
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| 23 | #endif |
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| 24 | |
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| 25 | #endif |
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| 26 | |
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