From:	"Ghalos" <greg AT holdridge7 DOT freeserve DOT co DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: New convert has a question
Date:	Thu, 20 May 1999 09:37:19 +0100
Organization:	Customer of Planet Online
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References:	<7hv665$pni$1 AT news6 DOT svr DOT pol DOT co DOT uk> <37433E36 DOT 76780C62 AT cartsys DOT com>
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To:	djgpp AT delorie DOT com
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  Thanks a lot.  Bye for now

--
   I'd give my right arm to be ambidextruous,
                          Ghalos
Nate Eldredge wrote in message <37433E36 DOT 76780C62 AT cartsys DOT com>...
>
>Far pointers are quite safe and reasonably fast:
>
>_farpokeb(_dos_ds, 0xa0000 + x + (y * 320), val);
>
>If you have a buffered graphics algorithm (draw to a memory array and
>blit to the screen), you can use dosmemput; that's about as fast as you
>can get.
>
>[Btw: Interestingly, GCC generates better code for `y * 320' than for
>`(y << 6) + (y << 8)'.  Try them and see.  Hint: The `lea' instruction
>can multiply by five!]
>--
>
>Nate Eldredge
>nate AT cartsys DOT com

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