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[Freeciv-Dev] Re: the directional system

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To: jdorje@xxxxxxxxxxxxxxxxxxxxx
Cc: freeciv-dev@xxxxxxxxxxx
Subject: [Freeciv-Dev] Re: the directional system
From: Trent Piepho <xyzzy@xxxxxxxxxxxxx>
Date: Fri, 7 Sep 2001 04:51:36 -0700 (PDT) 
On Fri, 7 Sep 2001, Jason Dorje Short wrote:

+#define DIR_REVERSE(dir) (((dir) + 4) % 8)

This is a faster way to do it.  Modulus operations are very expensive, but a
bitwise and is very cheap.

+#define DIR_REVERSE(dir) (((dir) + 4) & 7)
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