"SSE instruction set disabled?"

[Joseph S. Myers]

On Wed, 4 Dec 2002, R. Kelley Cook wrote:

> This makes absolute complete sense.
> 
> "-mmmx", "-msse", "-msse2", and "-m3dnow" (and their coresponding 
> -mno-xxx) should just go away.
> 
> They already are implied by -march=blahblah that we have.  If someone 
> wants code tuned for a pentium4, but without any SSE or MMX support then 
> they can type "-march=pentiumpro -mcpu=pentium4"

Don't some CPU types exist in versions with and without some of these
features, or should this be allowed for by more fine-grained -march?

There's also the question of allowing people to specify the options that
are the closest approximation to right if they have some clone CPU that
doesn't have a specific GCC option.

> Although, in my opinion "-mcpu=" should be renamed "-mtune=" like was 
> debated ages ago: http://gcc.gnu.org/ml/gcc/1999-01n/msg01004.html

I think the last proposal was for consistently named --arch / --tune
options across all targets (with corresponding ability for --help to list
the supported types with descriptions) ("gcc/config/mips/mips.h reorg"
thread on gcc-patches, June 2001).

-- 
Joseph S. Myers
jsm28@cam.ac.uk