preliminary patch: prefetch support for i386

[Richard Henderson]

On Thu, Nov 29, 2001 at 01:01:13PM -0800, Janis Johnson wrote:
> If a specified architecture (via -march) supports data prefetch
> instructions then an additional option for extensions shouldn't
> be necessary ...

Yes, but that's where things get confusing, with P1, P1+MMX,
P2, P2+MMX, P3, P4, K6, K6+3dNow, Athlon, Athlon+SSE...
So at present we just have -mmmx/-msse/-msse2/-m3dnow to
enable the various extensions.

Suggestions for how to do it better?


r~