26 lines
764 B
C
26 lines
764 B
C
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#ifndef _TOOLS_MATH_H
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#define _TOOLS_MATH_H
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/*
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* This looks more complex than it should be. But we need to
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* get the type for the ~ right in round_down (it needs to be
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* as wide as the result!), and we want to evaluate the macro
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* arguments just once each.
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*/
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#define __round_mask(x, y) ((__typeof__(x))((y)-1))
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#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
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#define round_down(x, y) ((x) & ~__round_mask(x, y))
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#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
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#ifndef roundup
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#define roundup(x, y) ( \
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{ \
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const typeof(y) __y = y; \
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(((x) + (__y - 1)) / __y) * __y; \
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} \
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)
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#endif
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#endif
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