J.C. Pizarro wrote:
For your Opteron, try with this option
-O3 -fomit-frame-pointer -march=k8 -funroll-loops -finline-functions
-fpeel-loops \
-mno-sse3 -msse2 -msse -mno-mmx -mno-3dnow
The Opteron hardware said that it's better to use SSE2 than SSE3.
The MMX and 3DNow!+ instructions are shorte
Andi Kleen writes:
> Andrew Haley <[EMAIL PROTECTED]> writes:
>
> > Howard Chu writes:
> >
> > > A bit of a minor mystery. Not a problem, just a curiosity. If
> > > someone knew off the top of their head a reason for it, that'd be
> > > cool, but otherwise no sweat.
> >
> > It's possib
Richard Guenther wrote:
On Nov 27, 2007 2:23 PM, Howard Chu <[EMAIL PROTECTED]> wrote:
A bit of a minor mystery. Not a problem, just a curiosity. If someone knew off
the top of their head a reason for it, that'd be cool, but otherwise no sweat.
I'd try -Os, you might run into ICache limitation
Andrew Haley <[EMAIL PROTECTED]> writes:
> Howard Chu writes:
>
> > A bit of a minor mystery. Not a problem, just a curiosity. If
> > someone knew off the top of their head a reason for it, that'd be
> > cool, but otherwise no sweat.
>
> It's possible, although unlikley, that the optimized code
Richard Guenther wrote:
> On Nov 27, 2007 2:23 PM, Howard Chu <[EMAIL PROTECTED]> wrote:
>> A bit of a minor mystery. Not a problem, just a curiosity. If someone knew
>> off
>> the top of their head a reason for it, that'd be cool, but otherwise no
>> sweat.
>
> I'd try -Os, you might run into I
For your Opteron, try with this option
-O3 -fomit-frame-pointer -march=k8 -funroll-loops -finline-functions
-fpeel-loops \
-mno-sse3 -msse2 -msse -mno-mmx -mno-3dnow
The Opteron hardware said that it's better to use SSE2 than SSE3.
The MMX and 3DNow!+ instructions are shorter and older than SSE2/
Howard Chu writes:
> A bit of a minor mystery. Not a problem, just a curiosity. If
> someone knew off the top of their head a reason for it, that'd be
> cool, but otherwise no sweat.
It's possible, although unlikley, that the optimized code has worse
cache behaviour. No way to know better wit
On Nov 27, 2007 2:23 PM, Howard Chu <[EMAIL PROTECTED]> wrote:
> A bit of a minor mystery. Not a problem, just a curiosity. If someone knew off
> the top of their head a reason for it, that'd be cool, but otherwise no sweat.
I'd try -Os, you might run into ICache limitations.
Richard.
>
