[fpc-pascal] selecting target processor

Tomas Hajny XHajT03 at mbox.vol.cz
Sun Jun 19 23:10:45 CEST 2005

Date sent:      	Sun, 19 Jun 2005 22:49:44 +0200
From:           	Florian Klaempfl <florian at freepascal.org>
To:             	FPC-Pascal users discussions <fpc-pascal at lists.freepascal.org>
Subject:        	Re: [fpc-pascal] selecting target processor
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> > On 19 Jun 2005, at 20:48, Marc Santhoff wrote:
> > 
> >> how can I tell fpc to use only instructions supported on a specific
> >> processor?
> >>
> >> I'm compiling on an athlon for running on a geode (restriction has
> >> to define instruction set from x686 to x586, I think).
> > 
> > In theory, the code generated by FPC should always run on an i386 
> > (even if you use e.g. -Op3), unless you use some special command
> > line switches I cannot find in the help. 
>   -C<x>  code generation options:
>       -Cc<x>     set default calling convention to <x>
>       -CD        create also dynamic library (not supported)
>       -Ce        Compilation with emulated floating point opcodes
>       -Cf<x>     Select fpu instruction set to use, see fpc -i for
> possible values
>       -Cg        Generate PIC code
>       -Ch<n>     <n> bytes heap (between 1023 and 67107840)
>       -Ci        IO-checking
>       -Cn        omit linking stage
>       -Co        check overflow of integer operations
>       -Cp<x>     select instruction set, see fpc -i for possible
>       values
> That is it :)

Nice can of worms I haven't been aware of... ;-) So what is the best -
Cp option for my Athlon then? ;-))) And what would be correct for AMD 
K6 and all other non-Intel CPUs > 386? Looks as a lot of work for 


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