[fpc-devel] Bit manipulation as optimization in FPC

Jonas Maebe jonas.maebe at elis.ugent.be
Thu Sep 7 08:44:10 CEST 2006

On 7 sep 2006, at 07:52, Peter Vreman wrote:

> This is not a generic optimization that will give real benefits.  
> Your code
> also relies on the fact that (a<b) always returns 0 or 1. But this  
> is not
> garantueed. A boolean is defined as 0=false and everything else is  
> true.

Afaik only in case of reading a boolean everything <> 0 is true (for  
compatibility with other languages). In case of writing, Pascal (and  
FPC in particular) always stores a 1 for true and 0 for false, since  
boolean is defined as an enum with values (false, true)


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