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From: Melzzzzz <mel@zzzzz.invalid>
Newsgroups: comp.programming,comp.programming.threads
Subject: Re: To Melzzzzz
Date: Sun, 29 Jun 2014 16:46:21 +0200
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On Sun, 29 Jun 2014 10:41:30 -0700
Ramine <ramine@1.1> wrote:

> On 6/28/2014 7:10 PM, Melzzzzz wrote:
> > On Sat, 28 Jun 2014 15:51:59 -0700
> > Ramine <ramine@1.1> wrote:
> >
> >>
> >> Hello,
> >>
> >> I have looked at your matrix multiplication using
> >> SSE2 and AVX that you have posted on assembler.x86 forum,
> >> i just wanted to tell you that you don't need to write
> >> it in assembler, cause GCC do auto-vectorize the floating
> >> point calculation and it auto-vectorize also the Matrix
> >> multiplication even at -O1 optimization...
> >
> > as I see it it don't....
> >
> >
> >   and GCC do
> >> auto-vectorize beautifully since the GCC auto-vectorization
> >> have  given a good results on scimark2 benchmark too.
> >
> > Care to share example?
> 
> 
> You can download the following scimark2 and compile it with
> the newest version of tdm-gcc with just -O1 level optimization
> and -S to generate the assembler code and after that look at the 
> assembler code and you will see that it is auto-vectorizing the code:
> 
> http://math.nist.gov/scimark2/

I have this benchmark long ago and it seems to autovectorize onli LU
and that at -O3.
bmaxa@maxa:~/examples/forth/sci$ gcc-trunk -O2 *.c -o scimark2 -lm
bmaxa@maxa:~/examples/forth/sci$ time ./scimark2 
**                                                              **
** SciMark2 Numeric Benchmark, see http://math.nist.gov/scimark **
** for details. (Results can be submitted to pozo@nist.gov)     **
**                                                              **
Using       2.00 seconds min time per kenel.
Composite Score:         1739.60
FFT             Mflops:  1782.75    (N=1024)
SOR             Mflops:  1305.62    (100 x 100)
MonteCarlo:     Mflops:   618.10
Sparse matmult  Mflops:  2255.16    (N=1000, nz=5000)
LU              Mflops:  2736.35    (M=100, N=100)

real	0m33.408s
user	0m33.331s
sys	0m0.052s
bmaxa@maxa:~/examples/forth/sci$ gcc-trunk -O3 *.c -o scimark2 -lm
bmaxa@maxa:~/examples/forth/sci$ time ./scimark2 
**                                                              **
** SciMark2 Numeric Benchmark, see http://math.nist.gov/scimark **
** for details. (Results can be submitted to pozo@nist.gov)     **
**                                                              **
Using       2.00 seconds min time per kenel.
Composite Score:         2102.19
FFT             Mflops:  1855.88    (N=1024)
SOR             Mflops:  1848.64    (100 x 100)
MonteCarlo:     Mflops:   621.80
Sparse matmult  Mflops:  2275.65    (N=1000, nz=5000)
LU              Mflops:  3908.98    (M=100, N=100)

real	0m28.933s
user	0m28.849s
sys	0m0.050s


> 
> 
> Thank you,
> Amine Moulay Ramdane.
> 
> 
> >
> >>
> >>
> >> Thank you,
> >> Amine Moulay Ramdane.
> >>
> >>
> >>
> >>
> >
> >
> >
> 



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