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    Subject: Re: Vectorization in gcc 4.1.1
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> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: Vectorization in gcc 4.1.1
>
>
>
>
> Date: 
>
> Wed, 04 Jul 2007 05:51:59 GMT
>
>
>
>
> rameshk <address@hidden> wrote in message...
> > Hi,
> > I was trying to get gcc to vectorize a simple loop:
> >
> > #include <vector>
> // > int test(double *x , int size);
> >
> > int test(double *x, int size){
> >         int ret = 1;
> >         std::vector<double>     v;
> >         v.resize(size);
> >         double  *a = &v[0];
>
>    std::cout<<"sizeof(double)="<<sizeof(double)<<std::endl;
>    std::vector<double> vD( 10 );
>    std::cout<<"sizeof(vD)="<<sizeof(vD)<<std::endl;
> /* - out -
> sizeof(double)=8
> sizeof(vD)=12
> */
>
> >         for(int i = 0;i < size; ++i )
> >         {
> >                 a[i ] = 1/x[i];      // ka-boom
> >         }
> >
> > }
>
> int test( double *x, int size ){
>      int ret = 1;
>      // std::vector<double> v( size );
>      // for( std::size_t a(0); a < v.size(); ++a ){  v.at( i ) = 1/x[i]; }
> // for(a)
>
>      std::vector<double> v( x, x + size );
>
>      // .... do something with 'v'
>      return ret;
>      }
>
> --
> Bob R
> POVrookie
>
>
>
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