-march=pentium2 + -mtune=pentium4 faster then -march=pentium4?

[Kris Kennaway]

On Mon, Mar 27, 2006 at 01:05:13PM -0600, Nikolas Britton wrote:
> Why does GCC produce faster code using "-march=pentium2
> -mtune=pentium4" on a Pentium 4 chip versus plain -march=pentium4?
> 
> Try it...
> 
> CPUTYPE=pentium2
> CFLAGS+= -mtune=pentium4
> COPTFLAGS+= -mtune=pentium4

Talk to the gcc developers (and provide benchmarks). 

Kris
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