OpenBLAS/kernel/power/daxpy.c

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/**************************************************************************************
* 2016/03/22 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 "daxpy_microk_power8.c"
#endif
#endif


#ifndef HAVE_KERNEL_8

static void daxpy_kernel_8(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT alpha)
{
	BLASLONG register i = 0;

	while(i < n)
        {
              y[i]   += alpha * x[i];
              y[i+1] += alpha * x[i+1];
              y[i+2] += alpha * x[i+2];
              y[i+3] += alpha * x[i+3];
              y[i+4] += alpha * x[i+4];
              y[i+5] += alpha * x[i+5];
              y[i+6] += alpha * x[i+6];
              y[i+7] += alpha * x[i+7];
              i+=8 ;

       }

}

#endif

int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT da, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *dummy, BLASLONG dummy2)
{
	BLASLONG i=0;
	BLASLONG ix=0,iy=0;

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

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

		BLASLONG n1 = n & -16;

		if ( n1 )
			daxpy_kernel_8(n1, x, y, da);

		i = n1;
		while(i < n)
		{

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

		}
		return(0);


	}

	BLASLONG n1 = n & -4;

	while(i < n1)
	{

		FLOAT m1      = da * x[ix] ;
		FLOAT m2      = da * x[ix+inc_x] ;
		FLOAT m3      = da * x[ix+2*inc_x] ;
		FLOAT m4      = da * x[ix+3*inc_x] ;

		y[iy]         += m1 ;
		y[iy+inc_y]   += m2 ;
		y[iy+2*inc_y] += m3 ;
		y[iy+3*inc_y] += m4 ;

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

	}

	while(i < n)
	{

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

	}
	return(0);

}