OpenBLAS/kernel/x86_64/ddot.c

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#include "common.h"


#if defined(BULLDOZER) || defined(PILEDRIVER) || defined(STEAMROLLER)
#include "ddot_microk_bulldozer-2.c"
#elif defined(NEHALEM)
#include "ddot_microk_nehalem-2.c"
#endif


#ifndef HAVE_KERNEL_8

static void ddot_kernel_8(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *d)
{
	BLASLONG register i = 0;
	FLOAT dot = 0.0;

	while(i < n)
        {
              dot += y[i]  * x[i]
                  + y[i+1] * x[i+1]
                  + y[i+2] * x[i+2]
                  + y[i+3] * x[i+3]
                  + y[i+4] * x[i+4]
                  + y[i+5] * x[i+5]
                  + y[i+6] * x[i+6]
                  + y[i+7] * x[i+7] ;

              i+=8 ;

       }
       *d += dot;

}

#endif

FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
{
	BLASLONG i=0;
	BLASLONG ix=0,iy=0;

	FLOAT  dot = 0.0 ;

	if ( n <= 0 )  return(dot);

	if ( (inc_x == 1) && (inc_y == 1) )
	{

		int n1 = n & -8;

		if ( n1 )
			ddot_kernel_8(n1, x, y , &dot );


		i = n1;
		while(i < n)
		{

			dot += y[i] * x[i] ;
			i++ ;

		}
		return(dot);


	}

	while(i < n)
	{

		dot += y[iy] * x[ix] ;
		ix  += inc_x ;
		iy  += inc_y ;
		i++ ;

	}
	return(dot);

}