Hello,
I tried with your options but it seems to make no difference. In
another email it was suggested to use _mm_sqrt_sd, because I only
needed one sqrt calculation. That improved time and indeed, almost
reach serial version (now it runs up to 1 second slower for the 10,000
data example, hehe).
But of course, I would wanna/expect the vector version to run faster
... still unsure how to achieve that.
Thanks
On Mon, Apr 7, 2008 at 10:23 AM, jlh <jlh@xxxxxx> wrote:
> Dario Bahena Tapia wrote:
>
> >
> > inline static double dist(int i,int j)
> > {
> > double xd = C[i][X] - C[j][X];
> > double yd = C[i][Y] - C[j][Y];
> > return rint(sqrt(xd*xd + yd*yd));
> > }
> > [...]
> >
> > And in order to activate the SSE2 features, I am using the following
> > flags for gcc (my computer is a laptop):
> >
> > CFLAGS = -O -Wall -march=pentium-m -msse2
> >
>
> These options do not make dist() use any SSE for me. Have you
> tried compiling with this?
>
> CFLAGS = -O2 -Wall -march=pentium-m -mfpmath=sse
>
> I think -msse2 is redundant if you say -march-pentium-m. I don't
> have an SSE2 machine to try this though.
>
> jlh
>
