OpenBLAS/kernel/x86_64/sscal.c

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#include "common.h"

#if defined(HASWELL) || defined(ZEN)
#include "sscal_microk_haswell-2.c"
#elif  defined (SKYLAKEX) || defined (COOPERLAKE) || defined (SAPPHIRERAPIDS)
#include "sscal_microk_skylakex-2.c"
#endif


#if !defined(HAVE_KERNEL_16)

static void sscal_kernel_16( BLASLONG n, FLOAT *da , FLOAT *x )
{

	BLASLONG i;
	FLOAT alpha = *da;

	for( i=0; i<n; i+=8 )
	{
		x[0] *= alpha;
		x[1] *= alpha;
		x[2] *= alpha;
		x[3] *= alpha;
		x[4] *= alpha;
		x[5] *= alpha;
		x[6] *= alpha;
		x[7] *= alpha;
		x+=8;
	}

}


static void sscal_kernel_16_zero( BLASLONG n, FLOAT *alpha , FLOAT *x )
{

	BLASLONG i;
	for( i=0; i<n; i+=8 )
	{
		x[0] = 0.0;
		x[1] = 0.0;
		x[2] = 0.0;
		x[3] = 0.0;
		x[4] = 0.0;
		x[5] = 0.0;
		x[6] = 0.0;
		x[7] = 0.0;
		x+=8;
	}

}

#endif


static void sscal_kernel_inc_8(BLASLONG n, FLOAT *alpha, FLOAT *x, BLASLONG inc_x)  __attribute__ ((noinline));

static void sscal_kernel_inc_8(BLASLONG n, FLOAT *alpha, FLOAT *x, BLASLONG inc_x)
{

	BLASLONG i;
	BLASLONG inc_x2 = 2 * inc_x;
	BLASLONG inc_x3 = inc_x2 + inc_x;
	FLOAT t0,t1,t2,t3;
	FLOAT da = alpha[0];

	for ( i=0; i<n; i+=4 )
	{
		t0 = da * x[0];
		t1 = da * x[inc_x];
		t2 = da * x[inc_x2];
		t3 = da * x[inc_x3];

		x[0]        = t0;
		x[inc_x]    = t1;
		x[inc_x2]   = t2;
		x[inc_x3]   = t3;

		x+=4*inc_x;

	}


}

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,j=0;

	if ( inc_x != 1 )
	{

		if ( da == 0.0 )
		{

			BLASLONG n1 = n & -2;

			while(j < n1)
			{

				x[i]=0.0;
				x[i+inc_x]=0.0;
				i += 2*inc_x ;
				j+=2;

			}

			while(j < n)
			{

				x[i]=0.0;
				i += inc_x ;
				j++;

			}
		}
		else
		{

			BLASLONG n1 = n & -8;
			if ( n1 > 0 )
			{
				sscal_kernel_inc_8(n1, &da, x, inc_x);
				i = n1 * inc_x;
				j = n1;
		        }

			while(j < n)
			{

				x[i] *= da;
				i += inc_x ;
				j++;

			}

		}

		return(0);
	}

	BLASLONG n1 = n & -16;
	if ( n1 > 0 )
	{
		if ( da == 0.0 )
			sscal_kernel_16_zero(n1 , &da , x);
		else
			sscal_kernel_16(n1 , &da , x);
	}

	if ( da == 0.0 )
	{
		for ( i=n1 ; i<n; i++ )
		{
			x[i] = 0.0;
		}
	}
	else
	{

		for ( i=n1 ; i<n; i++ )
		{
			x[i] *= da;
		}
	}
	return(0);
}