recognize x86 CPU variants take II

[Janis Johnson]

On Tue, Dec 11, 2001 at 12:43:54PM +0100, Jan Hubicka wrote:
> 
> Tue Dec 11 11:23:36 CET 2001  Jan Hubicka  <jh@suse.cz>
> 
> 	* i386.c (override_options): Recognize various CPU variants and set
> 	SSE/MMX/3dNOW flags accordingly.
> 	* i386.h (MASK_NOMMX, MASK_NOSSE, MASK_NOSSE2, MASK_NO3DNOW,
> 	MASK_NO3DNOW_A): New.
> 	(MASK_*): Renumber.
> 	(TARGET_FLAGS): Use new masks.
> 	(CPP_CPU_SPECS): Recognize new CPU variants.
> 	* invoke.texi (-mcpu): Update documentation.
 
This change could use some tests so we'll know when it breaks and to
ensure that you get what you expect to begin with.

See http://gcc.gnu.org/ml/gcc-patches/2001-11/msg02128.html for an
example of what I plan for testing prefetch support for x86 targets;
similar tests could check that the expected type of fp instructions
are being used, or that instructions from extension sets are only used
for the appropriate sets of options.

Janis