From: "Dario Bahena Tapia" <dario.mx@gmail.com>
To: "Dario Saccavino" <kathoum@gmail.com>
Cc: gcc-help@gcc.gnu.org
Subject: Re: Why worse performace in euclidean distance with SSE2?
Date: Mon, 07 Apr 2008 16:09:00 -0000 [thread overview]
Message-ID: <3d104d6f0804070904s6d196a02gbe86990152cb33fa@mail.gmail.com> (raw)
In-Reply-To: <b6621a6e0804070708o57499d4bm18fb34e041689178@mail.gmail.com>
Oh you are correct ... that improved a lot. However, it still runs
slower than serial version, about 1 second more for the 10,000 data
example.
Thanks.
On Mon, Apr 7, 2008 at 9:08 AM, Dario Saccavino <kathoum@gmail.com> wrote:
> Hello Dario,
>
> I haven't tried your code yet but I think you could get a good boost
> if you replace the "sqrt_pd" call with "sqrt_sd", since you only need
> the square root of a scalar.
>
> Dario
>
>
>
>
> >
> > inline static double dist_sse(int i,int j)
> > {
> > double d;
> > __m128d xmm0,xmm1;
> > xmm0 =_mm_load_pd(C[i]);
> > xmm1 = _mm_load_pd(C[j]);
> > xmm0 = _mm_sub_pd(xmm0,xmm1);
> > xmm1 = xmm0;
> > xmm0 = _mm_mul_pd(xmm0,xmm1);
> > xmm1 = _mm_shuffle_pd(xmm0, xmm0, _MM_SHUFFLE2(1, 1));
> > xmm0 = _mm_add_pd(xmm0,xmm1);
> > xmm0 = _mm_sqrt_pd(xmm0);
> > _mm_store_sd(&d,xmm0);
> > return rint(d);
> > }
> >
>
WARNING: multiple messages have this Message-ID
From: "Dario Bahena Tapia" <dario.mx@gmail.com>
To: "Dario Saccavino" <kathoum@gmail.com>
Cc: gcc-help@gcc.gnu.org
Subject: Re: Why worse performace in euclidean distance with SSE2?
Date: Mon, 07 Apr 2008 16:41:00 -0000 [thread overview]
Message-ID: <3d104d6f0804070904s6d196a02gbe86990152cb33fa@mail.gmail.com> (raw)
Message-ID: <20080407164100.ZwL-Mqmyj2mDwH8WRxD2rI9CXHhIOLMXGiW74kOXcbw@z> (raw)
In-Reply-To: <b6621a6e0804070708o57499d4bm18fb34e041689178@mail.gmail.com>
Oh you are correct ... that improved a lot. However, it still runs
slower than serial version, about 1 second more for the 10,000 data
example.
Thanks.
On Mon, Apr 7, 2008 at 9:08 AM, Dario Saccavino <kathoum@gmail.com> wrote:
> Hello Dario,
>
> I haven't tried your code yet but I think you could get a good boost
> if you replace the "sqrt_pd" call with "sqrt_sd", since you only need
> the square root of a scalar.
>
> Dario
>
>
>
>
> >
> > inline static double dist_sse(int i,int j)
> > {
> > double d;
> > __m128d xmm0,xmm1;
> > xmm0 =_mm_load_pd(C[i]);
> > xmm1 = _mm_load_pd(C[j]);
> > xmm0 = _mm_sub_pd(xmm0,xmm1);
> > xmm1 = xmm0;
> > xmm0 = _mm_mul_pd(xmm0,xmm1);
> > xmm1 = _mm_shuffle_pd(xmm0, xmm0, _MM_SHUFFLE2(1, 1));
> > xmm0 = _mm_add_pd(xmm0,xmm1);
> > xmm0 = _mm_sqrt_pd(xmm0);
> > _mm_store_sd(&d,xmm0);
> > return rint(d);
> > }
> >
>
next prev parent reply other threads:[~2008-04-07 16:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-07 14:09 Dario Bahena Tapia
2008-04-07 15:23 ` Dario Saccavino
2008-04-07 16:09 ` Dario Bahena Tapia [this message]
2008-04-07 16:41 ` Dario Bahena Tapia
2008-04-07 16:05 ` jlh
2008-04-07 17:02 ` Dario Bahena Tapia
2008-04-07 23:42 ` Brian Budge
2008-04-08 2:15 ` Dario Bahena Tapia
2008-04-08 8:34 ` Zuxy Meng
2008-04-08 15:57 ` Dario Bahena Tapia
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