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