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(svn r2758) Add the AB() macro to add a value to a bit range and use it in a few places, also make use of GB and SB nearby

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tron
2005-07-30 09:29:20 +00:00
parent 79620db9be
commit 9b676d2cd9
3 changed files with 9 additions and 16 deletions
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4
macros.h
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@@ -146,8 +146,10 @@ static inline void swap_tile(TileIndex *a, TileIndex *b) { TileIndex t = *a; *a
/// Fetch n bits starting at bit s from x
#define GB(x, s, n) (((x) >> (s)) & ((1 << (n)) - 1))
/// Set n bits in x starting at bit s to d
/// Set n bits starting at bit s in x to d
#define SB(x, s, n, d) ((x) = ((x) & ~(((1 << (n)) - 1) << (s))) | ((d) << (s)))
/// Add i to the n bits starting at bit s in x
#define AB(x, s, n, i) ((x) = ((x) & ~(((1 << (n)) - 1) << (s))) | (((x) + ((i) << (s))) & (((1 << (n)) - 1) << (s))))
/**
* ROtate x Left/Right by n (must be >= 0)