OpenBLAS/kernel/power/sdot.c

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/**************************************************************************************
* 2016/03/21 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 "sdot_microk_power8.c"
#endif
#endif


#ifndef HAVE_KERNEL_16

static FLOAT sdot_kernel_16(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

#if defined (DSDOT)
double CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
#else
FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
#endif
{
	BLASLONG i=0;
	BLASLONG ix=0,iy=0;
	double dot = 0.0 ;

#if defined (DSDOT)
        double mydot = 0.0;
        FLOAT asmdot = 0.0;
#else
	FLOAT mydot=0.0;
#endif
	BLASLONG n1;

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

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

	        n1 = n & (BLASLONG)(-32);

		if ( n1 )
#if defined(DSDOT)
			{
			FLOAT *x1=x;
			FLOAT *y1=y;
			BLASLONG n2 = 32;
			while (i<n1) {
				asmdot = sdot_kernel_16(n2, x1, y1);
				mydot += (double)asmdot;
				asmdot=0.;
				x1+=32;
				y1+=32;
				i+=32;
			}
		}
#else		
			mydot = sdot_kernel_16(n1, x, y);
#endif
		i = n1;
		while(i < n)
		{
#if defined(DSDOT)
			dot += (double)y[i] * (double)x[i] ;
#else
			dot += y[i] * x[i] ;
#endif
			i++ ;

		}

		dot+=mydot;
		return(dot);


	}

	n1 = n & (BLASLONG)(-2);

	while(i < n1)
	{
#if defined (DSDOT)
		dot += (double)y[iy] * (double)x[ix] + (double)y[iy+inc_y] * (double)x[ix+inc_x];
#else
		dot += y[iy] * x[ix] + y[iy+inc_y] * x[ix+inc_x];
#endif
		ix  += inc_x*2 ;
		iy  += inc_y*2 ;
		i+=2 ;

	}

	while(i < n)
	{
#if defined (DSDOT)
		dot += (double)y[iy] * (double)x[ix] ;
#else
		dot += y[iy] * x[ix] ;
#endif
		ix  += inc_x ;
		iy  += inc_y ;
		i++ ;

	}
	return(dot);

}