From 9b676d2cd992726223c39fd46db97994685df13f Mon Sep 17 00:00:00 2001 From: tron Date: Sat, 30 Jul 2005 09:29:20 +0000 Subject: (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 --- macros.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'macros.h') diff --git a/macros.h b/macros.h index a335b05e3..1232005cd 100644 --- a/macros.h +++ b/macros.h @@ -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) -- cgit v1.2.3-54-g00ecf