OpenBLAS/kernel/x86_64/ssymv_U.c

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#include "common.h"


#if defined(BULLDOZER) || defined(PILEDRIVER) || defined(STEAMROLLER)  || defined(EXCAVATOR)
#include "ssymv_U_microk_bulldozer-2.c"
#elif defined(NEHALEM)
#include "ssymv_U_microk_nehalem-2.c"
#elif defined(HASWELL) || defined(ZEN) || defined (SKYLAKEX) || defined (COOPERLAKE)
#include "ssymv_U_microk_haswell-2.c"
#elif defined(SANDYBRIDGE)
#include "ssymv_U_microk_sandy-2.c"
#endif

#ifndef HAVE_KERNEL_4x4

static void ssymv_kernel_4x4(BLASLONG n, FLOAT *a0, FLOAT *a1, FLOAT *a2, FLOAT *a3, FLOAT *xp, FLOAT *yp, FLOAT *temp1, FLOAT *temp2)
{
	FLOAT at0,at1,at2,at3;
	FLOAT x;
	FLOAT tmp2[4] = { 0.0, 0.0, 0.0, 0.0 };
	FLOAT tp0;
	FLOAT tp1;
	FLOAT tp2;
	FLOAT tp3;
	BLASLONG i;

	tp0 = temp1[0];
	tp1 = temp1[1];
	tp2 = temp1[2];
	tp3 = temp1[3];
	
	for (i=0; i<n; i++)
	{
		at0     = a0[i];
		at1     = a1[i];
		at2     = a2[i];
		at3     = a3[i];
		x       = xp[i];
		yp[i]   += tp0 * at0 + tp1 *at1 + tp2 * at2 + tp3 * at3;
		tmp2[0] += at0 * x;
		tmp2[1] += at1 * x;
		tmp2[2] += at2 * x;
		tmp2[3] += at3 * x;

	}

	temp2[0] += tmp2[0];
	temp2[1] += tmp2[1];
	temp2[2] += tmp2[2];
	temp2[3] += tmp2[3];
}

#endif


#ifndef HAVE_KERNEL_1x4

static void ssymv_kernel_1x4(BLASLONG from, BLASLONG to, FLOAT *a0, FLOAT *a1, FLOAT *a2, FLOAT *a3, FLOAT *xp, FLOAT *yp, FLOAT *temp1, FLOAT *temp2)
{
	FLOAT at0,at1,at2,at3;
	FLOAT x;
	FLOAT tmp2[4] = { 0.0, 0.0, 0.0, 0.0 };
	FLOAT tp0;
	FLOAT tp1;
	FLOAT tp2;
	FLOAT tp3;
	BLASLONG i;

	tp0 = temp1[0];
	tp1 = temp1[1];
	tp2 = temp1[2];
	tp3 = temp1[3];
	
	for (i=from; i<to; i++)
	{
		at0     = a0[i];
		at1     = a1[i];
		at2     = a2[i];
		at3     = a3[i];
		x       = xp[i];
		yp[i]   += tp0 * at0 + tp1 *at1 + tp2 * at2 + tp3 * at3;
		tmp2[0] += at0 * x;
		tmp2[1] += at1 * x;
		tmp2[2] += at2 * x;
		tmp2[3] += at3 * x;

	}

	temp2[0] += tmp2[0];
	temp2[1] += tmp2[1];
	temp2[2] += tmp2[2];
	temp2[3] += tmp2[3];
}

#endif


static void ssymv_kernel_8x1(BLASLONG n, FLOAT *a0, FLOAT *xp, FLOAT *yp, FLOAT *temp1, FLOAT *temp2)
{
	FLOAT at0,at1,at2,at3;
	FLOAT temp = 0.0;
	FLOAT t1   = *temp1;
	BLASLONG i;
	
	for (i=0; i<(n/4)*4; i+=4)
	{
		at0     = a0[i];
		at1     = a0[i+1];
		at2     = a0[i+2];
		at3     = a0[i+3];

		yp[i]   += t1    * at0;
		temp    += at0   * xp[i];
		yp[i+1] += t1    * at1;
		temp    += at1   * xp[i+1];

		yp[i+2] += t1    * at2;
		temp    += at2   * xp[i+2];
		yp[i+3] += t1    * at3;
		temp    += at3   * xp[i+3];

	}
	*temp2 = temp;
}

int CNAME(BLASLONG m, BLASLONG offset, FLOAT alpha, FLOAT *a, BLASLONG lda, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *buffer)
{
	BLASLONG i;
	BLASLONG ix,iy;
	BLASLONG jx,jy;
	BLASLONG j;
	BLASLONG j1;
	BLASLONG j2;
	BLASLONG m2;
	FLOAT temp1;
	FLOAT temp2;
	FLOAT *xp, *yp;
	FLOAT *a0,*a1,*a2,*a3;
	FLOAT tmp1[4];
	FLOAT tmp2[4];

#if 0
	if( m != offset )
		printf("Symv_U: m=%d offset=%d\n",m,offset);
#endif

	BLASLONG m1 = m - offset;
	BLASLONG mrange = m -m1;

	if ( (inc_x!=1) || (inc_y!=1) || (mrange<16) )
	{

		jx = m1 * inc_x;
		jy = m1 * inc_y;

		for (j=m1; j<m; j++)
		{
			temp1 = alpha * x[jx];
			temp2 = 0.0;
			iy = 0;
			ix = 0;
			for (i=0; i<j; i++)
			{
				y[iy] += temp1 * a[j*lda+i];
				temp2 += a[j*lda+i] * x[ix];
				ix += inc_x;
				iy += inc_y;
			
			}
			y[jy] += temp1 * a[j*lda+j] + alpha * temp2;
			jx    += inc_x;
			jy    += inc_y;
		}
		return(0);
	}

	xp = x;
	yp = y;

	m2 = m - ( mrange % 4 );

	for (j=m1; j<m2; j+=4)
	{
		tmp1[0] = alpha * xp[j];
		tmp1[1] = alpha * xp[j+1];
		tmp1[2] = alpha * xp[j+2];
		tmp1[3] = alpha * xp[j+3];
		tmp2[0] = 0.0;
		tmp2[1] = 0.0;
		tmp2[2] = 0.0;
		tmp2[3] = 0.0;
		a0    = &a[j*lda];
		a1    = a0+lda;
		a2    = a1+lda;
		a3    = a2+lda;
		j1 = (j/8)*8;		
		if ( j1 )
			ssymv_kernel_4x4(j1, a0, a1, a2, a3, xp, yp, tmp1, tmp2);
		if ( j1 < j )
			ssymv_kernel_1x4(j1, j,  a0, a1, a2, a3, xp, yp, tmp1, tmp2);

		j2 = 0;
		for ( j1 = j ; j1 < j+4 ; j1++ )
		{
			temp1 = tmp1[j2];
			temp2 = tmp2[j2];
			a0    = &a[j1*lda];
			for ( i=j ; i<j1; i++ )
			{
				yp[i] += temp1 * a0[i];	
				temp2 += a0[i] * xp[i];
				
			}
			y[j1] += temp1 * a0[j1] + alpha * temp2;
			j2++;

		}

	}

	for ( ; j<m; j++)
	{
		temp1 = alpha * xp[j];
		temp2 = 0.0;
		a0    = &a[j*lda];
		FLOAT at0;
		j1 = (j/8)*8;		

		if ( j1 )
			ssymv_kernel_8x1(j1, a0, xp, yp, &temp1, &temp2);

		for (i=j1 ; i<j; i++)
		{
			at0     = a0[i];
			yp[i] += temp1 * at0;
			temp2 += at0 * xp[i];
			
		}

		yp[j] += temp1 * a0[j] + alpha * temp2;
	}

	return(0);
	

}