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Re: FYI: -march/-mcpu patch for mips
On Fri, Jun 22, 2001 at 09:19:59PM -0700, Eric Christopher wrote:
>
> > > You should probably put in a check to make sure that both -march and
> > > -mcpu are both not given on the command line (and different).
> > >
> >
> > Why? What is wrong to have both? I thought it was the whole idea.
> >
>
> The "and different" was the operative part of the phrase. If they are
Did you mean `incompatible'? I don't see anything wrong if they
are simply different.
> different which one do you choose? As I said, I'd suggest producing a
> warning and chosing the -march option.
>
> I can't see a reason for them to be both included under gas right now.
> Please let me know if there is one though :)
>
In my patch, -march determines what instructions to use and -mcpu
determines how to schedule the instructions. I changed -mcpu so that
it wouldn't use any new instructions.
H.J.