OpenBLAS/kernel/x86_64/cdot.c

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#include "common.h"


#if defined(BULLDOZER)
#include "cdot_microk_bulldozer-2.c"
#elif defined(STEAMROLLER) || defined(PILEDRIVER)  || defined(EXCAVATOR)
#include "cdot_microk_steamroller-2.c"
#elif defined(HASWELL) || defined(ZEN) || defined (SKYLAKEX) || defined (COOPERLAKE) || defined (SAPPHIRERAPIDS)
#include "cdot_microk_haswell-2.c"
#elif defined(SANDYBRIDGE)
#include "cdot_microk_sandy-2.c"
#endif


#ifndef HAVE_KERNEL_16

static void cdot_kernel_16(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *d) __attribute__ ((noinline));

static void cdot_kernel_16(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *d)
{
	BLASLONG register i = 0;
	FLOAT dot[8] = { 0.0, 0.0, 0.0, 0.0, 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[4] += x[j]   * y[j+1] ;
            dot[5] += x[j+1] * y[j]   ;

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

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

            dot[2] += x[j+6] * y[j+6] ;
            dot[3] += x[j+7] * y[j+7] ;
            dot[6] += x[j+6] * y[j+7] ;
            dot[7] += 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];
	d[4] = dot[4];
	d[5] = dot[5];
	d[6] = dot[6];
	d[7] = dot[7];

}

#endif

OPENBLAS_COMPLEX_FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
{
	BLASLONG i;
	BLASLONG ix,iy;
	FLOAT  dot[8] = { 0.0, 0.0, 0.0 , 0.0, 0.0, 0.0, 0.0, 0.0 } ; 

	if ( n <= 0 ) 
	{
	    OPENBLAS_COMPLEX_FLOAT result = OPENBLAS_MAKE_COMPLEX_FLOAT (0.0, 0.0) ;
		return(result);

	}

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

		BLASLONG n1 = n & -16;

		if ( n1 )
		{
			cdot_kernel_16(n1, x, y , dot );
			dot[0] += dot[2];
			dot[1] += dot[3];
			dot[4] += dot[6];
			dot[5] += dot[7];
		}

		i = n1;
		BLASLONG j = i * 2;

		while( i < n )
		{

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

			j+=2;
			i++ ;

		}


	}
	else
	{
		i=0;
		ix=0;
		iy=0;
		inc_x *= 2;
		inc_y *= 2;
		while(i < n)
		{

			dot[0] += x[ix]   * y[iy]   ;
			dot[1] += x[ix+1] * y[iy+1] ;
			dot[4] += x[ix]   * y[iy+1] ;
			dot[5] += x[ix+1] * y[iy]   ;

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

		}
	}

#if !defined(CONJ)
	OPENBLAS_COMPLEX_FLOAT result = OPENBLAS_MAKE_COMPLEX_FLOAT (dot[0]-dot[1], dot[4]+dot[5]) ;
//	CREAL(result) = dot[0] - dot[1];
//	CIMAG(result) = dot[4] + dot[5];
#else
	OPENBLAS_COMPLEX_FLOAT result = OPENBLAS_MAKE_COMPLEX_FLOAT (dot[0]+dot[1], dot[4]-dot[5]) ;
//	CREAL(result) = dot[0] + dot[1];
//	CIMAG(result) = dot[4] - dot[5];

#endif

	return(result);

}