macros: add mask() as a macro to calculate the bit mask
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@ -21,6 +21,7 @@
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#define ROUND_DOWN(x, k) ((x) & ~((k) - 1))
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#define ROUND_UP(x, k) (((x) + (k) - 1) & ~((k) - 1))
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#define mask(x, k) ((x) & ((1 << (k)) - 1))
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#define align(x, k) ((x) & ~((1 << (k)) - 1))
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#define align_up(x, k) align(x + ((1 << (k)) - 1), k)
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#define is_aligned(x, k) (!((x) & ((1 << (k)) - 1)))
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