YoonioR's Quake Page: list od John'a Carmack'a

       From: John Carmack
       Date: Mon, 21 Oct 96 09:00:37 -0500
       To: Kamil Ruszkowski
       Subject: Re: Quake - fast or easy?
       References:
       X-PMFLAGS: 34078848

       You wrote:

       > We've had a bit of an argument about QUAKE using floating
       > math here in Polish USENET. Some say it is faster, some claim
       > it is easier to
       > write for FPU and the game would be much faster using just
       > integer.

       It is both faster and easier.

       For a 486, AMD, or cyrix cpu, quake would indeed go faster with
       just integer ops, but not on a pentium or pentium pro.

       We do a LOT of multiplies in quake, and we would suffer a great
       deal if they were  blocking integer operations instead of three /
       one cycle pipelined FP operations.

       Also, our inner texture mapping loop has an overlapped FP divide
       running in the background of each group of spans.

       People that are still resisting FP are living in the past...

       John Carmack