[bf1942] x86 optimizations?

[Udo Held]

Hi!

On Sat, Dec 28, 2002 at 08:17:08PM -0800, ScratchMonkey wrote:
> --On Saturday, December 28, 2002 5:12 AM -0500 "Ryan C. Gordon" 
> <icculus at clutteredmind.org> wrote:
> 
> >>Will it be using this information in the (near) future to do any sort of
> >>optimization for any specific CPU?
> >
> >If DICE adds it, but I wouldn't count on it. See below.
> 
> Optimization using special instructions is not that useful unless the code 
> is designed for it. What *is* useful is to recompile critical code (eg. 
> inner loops and other places that profiling reveals a lot of time is spent 
> in) for specific CPU's so that instructions are correctly ordered. 
> Different CPU's in the x86 family have different optimal instruction orders 
> for common sequences, to maximize utilization of the chip's internal 
> pipelines and parallelism not visible to the programmer.
> 
> Hence, it would be useful to build separate builds for each CPU to get 
> instruction ordering optimizations in critical code.

That's what I ment. Makefile tweaking and just compiling the dlls for
the most common cpus with different settings for gcc.

Regards
Udo