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/**************************************************************************************
* 2016/03/20 Werner Saar (wernsaar@googlemail.com)
* 	 BLASTEST 		: OK
* 	 CTEST			: OK
* 	 TEST			: OK
*	 LAPACK-TEST		: OK
**************************************************************************************/

#include "common.h"


#if defined(POWER8)  || defined(POWER9) || defined(POWER10)
#if defined(__VEC__) || defined(__ALTIVEC__)
#include "ddot_microk_power8.c"
#endif
#endif


#ifndef HAVE_KERNEL_8

static FLOAT ddot_kernel_8 (BLASLONG n, FLOAT *x, FLOAT *y)
{
	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 ;

       }
       return 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) )
	{

		BLASLONG n1 = n & -16;

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

		i = n1;
		while(i < n)
		{

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

		}
		return(dot);


	}

	FLOAT temp1 = 0.0;
	FLOAT temp2 = 0.0;

        BLASLONG n1 = n & -4;	

	while(i < n1)
	{

		FLOAT m1 = y[iy]       * x[ix] ;
		FLOAT m2 = y[iy+inc_y] * x[ix+inc_x] ;

		FLOAT m3 = y[iy+2*inc_y] * x[ix+2*inc_x] ;
		FLOAT m4 = y[iy+3*inc_y] * x[ix+3*inc_x] ;

		ix  += inc_x*4 ;
		iy  += inc_y*4 ;

		temp1 += m1+m3;
		temp2 += m2+m4;

		i+=4 ;

	}

	while(i < n)
	{

		temp1 += y[iy] * x[ix] ;
		ix  += inc_x ;
		iy  += inc_y ;
		i++ ;

	}
	dot = temp1 + temp2;
	return(dot);

}


