OpenBLAS/kernel/x86_64/cgemv_t_4.c

/***************************************************************************
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modification, are permitted provided that the following conditions are
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its contributors may be used to endorse or promote products
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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*****************************************************************************/


#include "common.h"

#if defined(HASWELL) || defined(ZEN) || defined (SKYLAKEX) || defined (COOPERLAKE)
#include "cgemv_t_microk_haswell-4.c"
#elif defined(BULLDOZER) || defined(PILEDRIVER) || defined(STEAMROLLER)  || defined(EXCAVATOR)
#include "cgemv_t_microk_bulldozer-4.c"
#endif

#define NBMAX 2048

#ifndef HAVE_KERNEL_4x4

static void cgemv_kernel_4x4(BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y, FLOAT *alpha)
{
	BLASLONG i;
	FLOAT *a0,*a1,*a2,*a3;
	a0 = ap[0];
	a1 = ap[1];
	a2 = ap[2];
	a3 = ap[3];
	FLOAT alpha_r = alpha[0];
	FLOAT alpha_i = alpha[1];
	FLOAT temp_r0 = 0.0;
	FLOAT temp_r1 = 0.0;
	FLOAT temp_r2 = 0.0;
	FLOAT temp_r3 = 0.0;
	FLOAT temp_i0 = 0.0;
	FLOAT temp_i1 = 0.0;
	FLOAT temp_i2 = 0.0;
	FLOAT temp_i3 = 0.0;


	for ( i=0; i< 2*n; i+=2 )
	{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
		temp_r0 += a0[i]*x[i]   - a0[i+1]*x[i+1];		
		temp_i0 += a0[i]*x[i+1] + a0[i+1]*x[i];		
		temp_r1 += a1[i]*x[i]   - a1[i+1]*x[i+1];		
		temp_i1 += a1[i]*x[i+1] + a1[i+1]*x[i];		
		temp_r2 += a2[i]*x[i]   - a2[i+1]*x[i+1];		
		temp_i2 += a2[i]*x[i+1] + a2[i+1]*x[i];		
		temp_r3 += a3[i]*x[i]   - a3[i+1]*x[i+1];		
		temp_i3 += a3[i]*x[i+1] + a3[i+1]*x[i];		
#else
		temp_r0 += a0[i]*x[i]   + a0[i+1]*x[i+1];		
		temp_i0 += a0[i]*x[i+1] - a0[i+1]*x[i];		
		temp_r1 += a1[i]*x[i]   + a1[i+1]*x[i+1];		
		temp_i1 += a1[i]*x[i+1] - a1[i+1]*x[i];		
		temp_r2 += a2[i]*x[i]   + a2[i+1]*x[i+1];		
		temp_i2 += a2[i]*x[i+1] - a2[i+1]*x[i];		
		temp_r3 += a3[i]*x[i]   + a3[i+1]*x[i+1];		
		temp_i3 += a3[i]*x[i+1] - a3[i+1]*x[i];		
#endif
	}

#if !defined(XCONJ)

	y[0] +=  alpha_r * temp_r0 - alpha_i * temp_i0;
	y[1] +=  alpha_r * temp_i0 + alpha_i * temp_r0;
	y[2] +=  alpha_r * temp_r1 - alpha_i * temp_i1;
	y[3] +=  alpha_r * temp_i1 + alpha_i * temp_r1;
	y[4] +=  alpha_r * temp_r2 - alpha_i * temp_i2;
	y[5] +=  alpha_r * temp_i2 + alpha_i * temp_r2;
	y[6] +=  alpha_r * temp_r3 - alpha_i * temp_i3;
	y[7] +=  alpha_r * temp_i3 + alpha_i * temp_r3;

#else

	y[0] +=  alpha_r * temp_r0 + alpha_i * temp_i0;
	y[1] -=  alpha_r * temp_i0 - alpha_i * temp_r0;
	y[2] +=  alpha_r * temp_r1 + alpha_i * temp_i1;
	y[3] -=  alpha_r * temp_i1 - alpha_i * temp_r1;
	y[4] +=  alpha_r * temp_r2 + alpha_i * temp_i2;
	y[5] -=  alpha_r * temp_i2 - alpha_i * temp_r2;
	y[6] +=  alpha_r * temp_r3 + alpha_i * temp_i3;
	y[7] -=  alpha_r * temp_i3 - alpha_i * temp_r3;

#endif
}
	
#endif

#ifndef HAVE_KERNEL_4x2

static void cgemv_kernel_4x2(BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y, FLOAT *alpha)
{
	BLASLONG i;
	FLOAT *a0,*a1;
	a0 = ap[0];
	a1 = ap[1];
	FLOAT alpha_r = alpha[0];
	FLOAT alpha_i = alpha[1];
	FLOAT temp_r0 = 0.0;
	FLOAT temp_r1 = 0.0;
	FLOAT temp_i0 = 0.0;
	FLOAT temp_i1 = 0.0;


	for ( i=0; i< 2*n; i+=2 )
	{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
		temp_r0 += a0[i]*x[i]   - a0[i+1]*x[i+1];		
		temp_i0 += a0[i]*x[i+1] + a0[i+1]*x[i];		
		temp_r1 += a1[i]*x[i]   - a1[i+1]*x[i+1];		
		temp_i1 += a1[i]*x[i+1] + a1[i+1]*x[i];		
#else
		temp_r0 += a0[i]*x[i]   + a0[i+1]*x[i+1];		
		temp_i0 += a0[i]*x[i+1] - a0[i+1]*x[i];		
		temp_r1 += a1[i]*x[i]   + a1[i+1]*x[i+1];		
		temp_i1 += a1[i]*x[i+1] - a1[i+1]*x[i];		
#endif
	}

#if !defined(XCONJ)

	y[0] +=  alpha_r * temp_r0 - alpha_i * temp_i0;
	y[1] +=  alpha_r * temp_i0 + alpha_i * temp_r0;
	y[2] +=  alpha_r * temp_r1 - alpha_i * temp_i1;
	y[3] +=  alpha_r * temp_i1 + alpha_i * temp_r1;

#else

	y[0] +=  alpha_r * temp_r0 + alpha_i * temp_i0;
	y[1] -=  alpha_r * temp_i0 - alpha_i * temp_r0;
	y[2] +=  alpha_r * temp_r1 + alpha_i * temp_i1;
	y[3] -=  alpha_r * temp_i1 - alpha_i * temp_r1;

#endif
}
	
#endif


#ifndef HAVE_KERNEL_4x1

static void cgemv_kernel_4x1(BLASLONG n, FLOAT *ap, FLOAT *x, FLOAT *y, FLOAT *alpha)
{
	BLASLONG i;
	FLOAT *a0;
	a0 = ap;
	FLOAT alpha_r = alpha[0];
	FLOAT alpha_i = alpha[1];
	FLOAT temp_r0 = 0.0;
	FLOAT temp_i0 = 0.0;

	for ( i=0; i< 2*n; i+=2 )
	{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
		temp_r0 += a0[i]*x[i]   - a0[i+1]*x[i+1];		
		temp_i0 += a0[i]*x[i+1] + a0[i+1]*x[i];		
#else
		temp_r0 += a0[i]*x[i]   + a0[i+1]*x[i+1];		
		temp_i0 += a0[i]*x[i+1] - a0[i+1]*x[i];		
#endif
	}

#if !defined(XCONJ)

	y[0] +=  alpha_r * temp_r0 - alpha_i * temp_i0;
	y[1] +=  alpha_r * temp_i0 + alpha_i * temp_r0;

#else

	y[0] +=  alpha_r * temp_r0 + alpha_i * temp_i0;
	y[1] -=  alpha_r * temp_i0 - alpha_i * temp_r0;

#endif


}

#endif


static void copy_x(BLASLONG n, FLOAT *src, FLOAT *dest, BLASLONG inc_src)
{
        BLASLONG i;
        for ( i=0; i<n; i++ )
        {
                *dest     = *src;
                *(dest+1) = *(src+1);
                dest+=2;
                src += inc_src;
        }
}


int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha_r, FLOAT alpha_i, FLOAT *a, BLASLONG lda, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *buffer)
{
	BLASLONG i;
	BLASLONG j;
	FLOAT *a_ptr;
	FLOAT *x_ptr;
	FLOAT *y_ptr;
	FLOAT *ap[8];
	BLASLONG n1;
	BLASLONG m1;
	BLASLONG m2;
	BLASLONG m3;
	BLASLONG n2;
	BLASLONG lda4;
	FLOAT ybuffer[8],*xbuffer;
	FLOAT alpha[2];

        if ( m < 1 ) return(0);
        if ( n < 1 ) return(0);

        inc_x *= 2;
        inc_y *= 2;
        lda   *= 2;
	lda4    = lda << 2;

	xbuffer = buffer;
	
	n1 = n  >> 2 ;
	n2 = n  &  3 ;
	
	m3 = m & 3 ;
	m1 = m - m3;
	m2 = (m & (NBMAX-1)) - m3 ;
	
	alpha[0] = alpha_r;
	alpha[1] = alpha_i;

	BLASLONG NB = NBMAX;

	while ( NB == NBMAX )
	{
		
		m1 -= NB;
		if ( m1 < 0)
		{
			if ( m2 == 0 ) break;	
			NB = m2;
		}
		
		y_ptr = y;
		a_ptr = a;
		x_ptr = x;
		ap[0] = a_ptr;
		ap[1] = a_ptr + lda;
		ap[2] = ap[1] + lda;
		ap[3] = ap[2] + lda;
		if ( inc_x != 2 )
			copy_x(NB,x_ptr,xbuffer,inc_x);
		else
			xbuffer = x_ptr;
		
		if ( inc_y == 2 )
		{

			for( i = 0; i < n1 ; i++)
			{
				cgemv_kernel_4x4(NB,ap,xbuffer,y_ptr,alpha);
				ap[0] += lda4;
				ap[1] += lda4;
				ap[2] += lda4;
				ap[3] += lda4;
				a_ptr += lda4;
				y_ptr += 8;
				
			}

			if ( n2 & 2 )
			{
				cgemv_kernel_4x2(NB,ap,xbuffer,y_ptr,alpha);
				a_ptr += lda * 2;
				y_ptr += 4;

			}

			if ( n2 & 1 )
			{
				cgemv_kernel_4x1(NB,a_ptr,xbuffer,y_ptr,alpha);
				/* a_ptr += lda;
				y_ptr += 2; */

			}

		}
		else
		{

			for( i = 0; i < n1 ; i++)
			{
				memset(ybuffer,0,32);
				cgemv_kernel_4x4(NB,ap,xbuffer,ybuffer,alpha);
				ap[0] += lda4;
				ap[1] += lda4;
				ap[2] += lda4;
				ap[3] += lda4;
				a_ptr += lda4;

				y_ptr[0] += ybuffer[0];
				y_ptr[1] += ybuffer[1];
				y_ptr  += inc_y;
				y_ptr[0] += ybuffer[2];
				y_ptr[1] += ybuffer[3];
				y_ptr  += inc_y;
				y_ptr[0] += ybuffer[4];
				y_ptr[1] += ybuffer[5];
				y_ptr  += inc_y;
				y_ptr[0] += ybuffer[6];
				y_ptr[1] += ybuffer[7];
				y_ptr  += inc_y;

			}

			for( i = 0; i < n2 ; i++)
			{
				memset(ybuffer,0,32);
				cgemv_kernel_4x1(NB,a_ptr,xbuffer,ybuffer,alpha);
				a_ptr += lda;
				y_ptr[0] += ybuffer[0];
				y_ptr[1] += ybuffer[1];
				y_ptr  += inc_y;

			}

		}
		a += 2 * NB;
		x += NB * inc_x;	
	}



	if ( m3 == 0 ) return(0);

        x_ptr = x;
        j=0;
        a_ptr = a;
        y_ptr = y;

	if ( m3 == 3 )
	{

                FLOAT temp_r ;
                FLOAT temp_i ;
		FLOAT x0 = x_ptr[0];
		FLOAT x1 = x_ptr[1];
		x_ptr += inc_x;
		FLOAT x2 = x_ptr[0];
		FLOAT x3 = x_ptr[1];
		x_ptr += inc_x;
		FLOAT x4 = x_ptr[0];
		FLOAT x5 = x_ptr[1];
	        while ( j < n)
        	{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
                       	temp_r  = a_ptr[0] * x0 - a_ptr[1] * x1; 
                       	temp_i  = a_ptr[0] * x1 + a_ptr[1] * x0; 
                       	temp_r += a_ptr[2] * x2 - a_ptr[3] * x3; 
                       	temp_i += a_ptr[2] * x3 + a_ptr[3] * x2; 
                       	temp_r += a_ptr[4] * x4 - a_ptr[5] * x5;
                       	temp_i += a_ptr[4] * x5 + a_ptr[5] * x4;
#else

                       	temp_r  = a_ptr[0] * x0 + a_ptr[1] * x1; 
                       	temp_i  = a_ptr[0] * x1 - a_ptr[1] * x0; 
                       	temp_r += a_ptr[2] * x2 + a_ptr[3] * x3; 
                       	temp_i += a_ptr[2] * x3 - a_ptr[3] * x2; 
                       	temp_r += a_ptr[4] * x4 + a_ptr[5] * x5;
                       	temp_i += a_ptr[4] * x5 - a_ptr[5] * x4;
#endif

#if !defined(XCONJ) 
                	y_ptr[0] += alpha_r * temp_r - alpha_i * temp_i;
                	y_ptr[1] += alpha_r * temp_i + alpha_i * temp_r;
#else
                	y_ptr[0] += alpha_r * temp_r + alpha_i * temp_i;
                	y_ptr[1] -= alpha_r * temp_i - alpha_i * temp_r;
#endif

                	a_ptr += lda;
                	y_ptr += inc_y;
                	j++;
        	}
        	return(0);
	}


	if ( m3 == 2 )
	{

                FLOAT temp_r ;
                FLOAT temp_i ;
                FLOAT temp_r1 ;
                FLOAT temp_i1 ;
		FLOAT x0 = x_ptr[0];
		FLOAT x1 = x_ptr[1];
		x_ptr += inc_x;
		FLOAT x2 = x_ptr[0];
		FLOAT x3 = x_ptr[1];
		FLOAT ar = alpha[0];
		FLOAT ai = alpha[1];

	        while ( j < ( n & -2 ))
        	{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
                       	temp_r  = a_ptr[0] * x0 - a_ptr[1] * x1; 
                       	temp_i  = a_ptr[0] * x1 + a_ptr[1] * x0; 
                       	temp_r += a_ptr[2] * x2 - a_ptr[3] * x3; 
                       	temp_i += a_ptr[2] * x3 + a_ptr[3] * x2; 
                	a_ptr += lda;
                       	temp_r1  = a_ptr[0] * x0 - a_ptr[1] * x1; 
                       	temp_i1  = a_ptr[0] * x1 + a_ptr[1] * x0; 
                       	temp_r1 += a_ptr[2] * x2 - a_ptr[3] * x3; 
                       	temp_i1 += a_ptr[2] * x3 + a_ptr[3] * x2; 
#else

                       	temp_r  = a_ptr[0] * x0 + a_ptr[1] * x1; 
                       	temp_i  = a_ptr[0] * x1 - a_ptr[1] * x0; 
                       	temp_r += a_ptr[2] * x2 + a_ptr[3] * x3; 
                       	temp_i += a_ptr[2] * x3 - a_ptr[3] * x2; 
                	a_ptr += lda;
                       	temp_r1  = a_ptr[0] * x0 + a_ptr[1] * x1; 
                       	temp_i1  = a_ptr[0] * x1 - a_ptr[1] * x0; 
                       	temp_r1 += a_ptr[2] * x2 + a_ptr[3] * x3; 
                       	temp_i1 += a_ptr[2] * x3 - a_ptr[3] * x2; 
#endif

#if !defined(XCONJ) 
                	y_ptr[0] += ar * temp_r - ai * temp_i;
                	y_ptr[1] += ar * temp_i + ai * temp_r;
                	y_ptr += inc_y;
                	y_ptr[0] += ar * temp_r1 - ai * temp_i1;
                	y_ptr[1] += ar * temp_i1 + ai * temp_r1;
#else
                	y_ptr[0] += ar * temp_r + ai * temp_i;
                	y_ptr[1] -= ar * temp_i - ai * temp_r;
                	y_ptr += inc_y;
                	y_ptr[0] += ar * temp_r1 + ai * temp_i1;
                	y_ptr[1] -= ar * temp_i1 - ai * temp_r1;
#endif

                	a_ptr += lda;
                	y_ptr += inc_y;
                	j+=2;
        	}


	        while ( j < n)
        	{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
                       	temp_r  = a_ptr[0] * x0 - a_ptr[1] * x1; 
                       	temp_i  = a_ptr[0] * x1 + a_ptr[1] * x0; 
                       	temp_r += a_ptr[2] * x2 - a_ptr[3] * x3; 
                       	temp_i += a_ptr[2] * x3 + a_ptr[3] * x2; 
#else

                       	temp_r  = a_ptr[0] * x0 + a_ptr[1] * x1; 
                       	temp_i  = a_ptr[0] * x1 - a_ptr[1] * x0; 
                       	temp_r += a_ptr[2] * x2 + a_ptr[3] * x3; 
                       	temp_i += a_ptr[2] * x3 - a_ptr[3] * x2; 
#endif

#if !defined(XCONJ) 
                	y_ptr[0] += ar * temp_r - ai * temp_i;
                	y_ptr[1] += ar * temp_i + ai * temp_r;
#else
                	y_ptr[0] += ar * temp_r + ai * temp_i;
                	y_ptr[1] -= ar * temp_i - ai * temp_r;
#endif

                	a_ptr += lda;
                	y_ptr += inc_y;
                	j++;
        	}

        	return(0);
	}


	if ( m3 == 1 )
	{

                FLOAT temp_r ;
                FLOAT temp_i ;
                FLOAT temp_r1 ;
                FLOAT temp_i1 ;
		FLOAT x0 = x_ptr[0];
		FLOAT x1 = x_ptr[1];
		FLOAT ar = alpha[0];
		FLOAT ai = alpha[1];

	        while ( j < ( n & -2 ))
        	{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
                       	temp_r  = a_ptr[0] * x0 - a_ptr[1] * x1; 
                       	temp_i  = a_ptr[0] * x1 + a_ptr[1] * x0; 
                	a_ptr += lda;
                       	temp_r1  = a_ptr[0] * x0 - a_ptr[1] * x1; 
                       	temp_i1  = a_ptr[0] * x1 + a_ptr[1] * x0; 
#else

                       	temp_r  = a_ptr[0] * x0 + a_ptr[1] * x1; 
                       	temp_i  = a_ptr[0] * x1 - a_ptr[1] * x0; 
                	a_ptr += lda;
                       	temp_r1  = a_ptr[0] * x0 + a_ptr[1] * x1; 
                       	temp_i1  = a_ptr[0] * x1 - a_ptr[1] * x0; 
#endif

#if !defined(XCONJ) 
                	y_ptr[0] += ar * temp_r - ai * temp_i;
                	y_ptr[1] += ar * temp_i + ai * temp_r;
                	y_ptr += inc_y;
                	y_ptr[0] += ar * temp_r1 - ai * temp_i1;
                	y_ptr[1] += ar * temp_i1 + ai * temp_r1;
#else
                	y_ptr[0] += ar * temp_r + ai * temp_i;
                	y_ptr[1] -= ar * temp_i - ai * temp_r;
                	y_ptr += inc_y;
                	y_ptr[0] += ar * temp_r1 + ai * temp_i1;
                	y_ptr[1] -= ar * temp_i1 - ai * temp_r1;
#endif

                	a_ptr += lda;
                	y_ptr += inc_y;
                	j+=2;
        	}

	        while ( j < n)
        	{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
                       	temp_r  = a_ptr[0] * x0 - a_ptr[1] * x1; 
                       	temp_i  = a_ptr[0] * x1 + a_ptr[1] * x0; 
#else

                       	temp_r  = a_ptr[0] * x0 + a_ptr[1] * x1; 
                       	temp_i  = a_ptr[0] * x1 - a_ptr[1] * x0; 
#endif

#if !defined(XCONJ) 
                	y_ptr[0] += ar * temp_r - ai * temp_i;
                	y_ptr[1] += ar * temp_i + ai * temp_r;
#else
                	y_ptr[0] += ar * temp_r + ai * temp_i;
                	y_ptr[1] -= ar * temp_i - ai * temp_r;
#endif

                	a_ptr += lda;
                	y_ptr += inc_y;
                	j++;
        	}
        	return(0);
	}

	return(0);


}