OpenBLAS/kernel/power/zdot.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__)
#pragma GCC optimize "O1"
#include "zdot_microk_power8.c"
#endif
#endif


#ifndef HAVE_KERNEL_8

static void zdot_kernel_8(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *d)
{
	BLASLONG register i = 0;
	FLOAT dot[4] = { 0.0, 0.0, 0.0, 0.0 };
	BLASLONG j=0;

	while( i < n )
        {

            dot[0] += x[j]   * y[j]   ;
            dot[1] += x[j+1] * y[j+1] ;
            dot[2] += x[j]   * y[j+1] ;
            dot[3] += x[j+1] * y[j]   ;

            dot[0] += x[j+2] * y[j+2] ;
            dot[1] += x[j+3] * y[j+3] ;
            dot[2] += x[j+2] * y[j+3] ;
            dot[3] += x[j+3] * y[j+2] ;

            dot[0] += x[j+4] * y[j+4] ;
            dot[1] += x[j+5] * y[j+5] ;
            dot[2] += x[j+4] * y[j+5] ;
            dot[3] += x[j+5] * y[j+4] ;

            dot[0] += x[j+6] * y[j+6] ;
            dot[1] += x[j+7] * y[j+7] ;
            dot[2] += x[j+6] * y[j+7] ;
            dot[3] += x[j+7] * y[j+6] ;

	    j+=8;
            i+=4;

        }
	d[0] = dot[0];
	d[1] = dot[1];
	d[2] = dot[2];
	d[3] = dot[3];

}

#endif

FLOAT _Complex CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
{
	BLASLONG i;
	BLASLONG ix,iy;
	FLOAT _Complex result;
	FLOAT  dot[4] = { 0.0, 0.0, 0.0 , 0.0 } ; 

	if ( n <= 0 ) 
	{	/*
	        __real__ result = 0.0 ;
        	__imag__ result = 0.0 ;
		*/
		result = OPENBLAS_MAKE_COMPLEX_FLOAT(0.0,0.0);
		return(result);

	}

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

		BLASLONG n1 = n & -8;

		if ( n1 )
			zdot_kernel_8(n1, x, y , dot );

		i = n1;
		BLASLONG j = i * 2;

		while( i < n )
		{

			dot[0] += x[j]   * y[j]   ;
			dot[1] += x[j+1] * y[j+1] ;
			dot[2] += x[j]   * y[j+1] ;
			dot[3] += x[j+1] * y[j]   ;

			j+=2;
			i++ ;

		}


	}
	else
	{
		i=0;
		ix=0;
		iy=0;
		inc_x <<= 1;
		inc_y <<= 1;
		while(i < n)
		{

			dot[0] += x[ix]   * y[iy]   ;
			dot[1] += x[ix+1] * y[iy+1] ;
			dot[2] += x[ix]   * y[iy+1] ;
			dot[3] += x[ix+1] * y[iy]   ;

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

		}
	}

#if !defined(CONJ)
	/*
	__real__ result = dot[0] - dot[1];
	__imag__ result = dot[2] + dot[3];
	*/
	result = OPENBLAS_MAKE_COMPLEX_FLOAT(dot[0]-dot[1],dot[2]+dot[3]);
#else
	/*
	__real__ result = dot[0] + dot[1];
	__imag__ result = dot[2] - dot[3];
	*/
	result = OPENBLAS_MAKE_COMPLEX_FLOAT(dot[0]+dot[1],dot[2]-dot[3]);

#endif

	return(result);

}