OpenBLAS/kernel/power/sgemv_n.c

/***************************************************************************
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#if !defined(__VEC__) || !defined(__ALTIVEC__)
#include "../arm/gemv_n.c"

#else

#include "common.h"

#define NBMAX 4096

static void sgemv_kernel_4x8(BLASLONG n, FLOAT **ap, FLOAT *xo, FLOAT *y, BLASLONG lda4, FLOAT *alpha)
{

    BLASLONG i;
	FLOAT *a0,*a1,*a2,*a3,*b0,*b1,*b2,*b3; 
    FLOAT x0,x1,x2,x3,x4,x5,x6,x7;
	a0 = ap[0];
	a1 = ap[1];
	a2 = ap[2];
	a3 = ap[3]; 
    b0 = a0 + lda4 ;
	b1 = a1 + lda4 ;
	b2 = a2 + lda4 ;
	b3 = a3 + lda4 ;
    x0 = xo[0] * *alpha;
    x1 = xo[1] * *alpha;
    x2 = xo[2] * *alpha;
    x3 = xo[3] * *alpha;
    x4 = xo[4] * *alpha;
    x5 = xo[5] * *alpha;
    x6 = xo[6] * *alpha;
    x7 = xo[7] * *alpha;
    __vector float* va0 = (__vector float*)a0;
    __vector float* va1 = (__vector float*)a1;
    __vector float* va2 = (__vector float*)a2;
    __vector float* va3 = (__vector float*)a3;
    __vector float* vb0 = (__vector float*)b0;
    __vector float* vb1 = (__vector float*)b1;
    __vector float* vb2 = (__vector float*)b2;
    __vector float* vb3 = (__vector float*)b3; 
    
    __vector float   v_x0 = {x0,x0,x0,x0};
    __vector float   v_x1 = {x1,x1,x1,x1};
    __vector float   v_x2 = {x2,x2,x2,x2};
    __vector float   v_x3 = {x3,x3,x3,x3};
    __vector float   v_x4 = {x4,x4,x4,x4};
    __vector float   v_x5 = {x5,x5,x5,x5};
    __vector float   v_x6 = {x6,x6,x6,x6};
    __vector float   v_x7 = {x7,x7,x7,x7};
    __vector float* v_y =(__vector float*)y;   
 
    for ( i=0; i< n/4; i++)
    {
        register __vector float vy=v_y[i];
        vy   += v_x0 * va0[i]   +  v_x1 * va1[i]   + v_x2 * va2[i]   + v_x3 * va3[i] ; 
        vy  += v_x4 * vb0[i]   +  v_x5 * vb1[i]   + v_x6 * vb2[i]   + v_x7 * vb3[i] ;
        v_y[i] =vy;  
    }

}
	 
static void sgemv_kernel_4x4(BLASLONG n, FLOAT **ap, FLOAT *xo, FLOAT *y, FLOAT *alpha)
{
    BLASLONG i;
    FLOAT x0,x1,x2,x3;
    x0 = xo[0] * *alpha;
    x1 = xo[1] * *alpha;
    x2 = xo[2] * *alpha;
    x3 = xo[3] * *alpha;
    __vector float   v_x0 = {x0,x0,x0,x0};
    __vector float   v_x1 = {x1,x1,x1,x1};
    __vector float   v_x2 = {x2,x2,x2,x2};
    __vector float   v_x3 = {x3,x3,x3,x3};
    __vector float* v_y =(__vector float*)y;      
    __vector float* va0 = (__vector float*)ap[0];
    __vector float* va1 = (__vector float*)ap[1];
    __vector float* va2 = (__vector float*)ap[2];
    __vector float* va3 = (__vector float*)ap[3]; 
 
    for ( i=0; i< n/4; i++ )
    {
        register __vector float vy=v_y[i];
        vy   += v_x0 * va0[i]   +  v_x1 * va1[i]   + v_x2 * va2[i]   + v_x3 * va3[i] ;  
        v_y[i] =vy;     
    }

} 

static void sgemv_kernel_4x2( BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y, FLOAT *alpha)
{

    BLASLONG i;
    FLOAT x0,x1;
    x0 = x[0] * *alpha;
    x1 = x[1] * *alpha; 
    __vector float   v_x0 = {x0,x0,x0,x0};
    __vector float   v_x1 = {x1,x1,x1,x1}; 
    __vector float* v_y =(__vector float*)y;      
    __vector float* va0 = (__vector float*)ap[0];
    __vector float* va1 = (__vector float*)ap[1]; 
 
    for ( i=0; i< n/4; i++ )
    { 
        v_y[i]   += v_x0 * va0[i]   +  v_x1 * va1[i] ;     
    }

} 
 
 
static void sgemv_kernel_4x1(BLASLONG n, FLOAT *ap, FLOAT *x, FLOAT *y, FLOAT *alpha)
{

    BLASLONG i;
    FLOAT x0 ;
    x0 = x[0] * *alpha; 
    __vector float   v_x0 = {x0,x0,x0,x0}; 
    __vector float* v_y =(__vector float*)y;      
    __vector float* va0 = (__vector float*)ap; 
 
    for ( i=0; i< n/4; i++ )
    { 
        v_y[i]   += v_x0 * va0[i]  ;        
    }

}
 
static void add_y(BLASLONG n, FLOAT *src, FLOAT *dest, BLASLONG inc_dest)
{
    BLASLONG i;
        
    for ( i=0; i<n; i++ ){
            *dest += *src;
            src++;
            dest += inc_dest;
    }
    return;
     

}

int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha, FLOAT *a, BLASLONG lda, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *buffer)
{
	BLASLONG i;
	FLOAT *a_ptr;
	FLOAT *x_ptr;
	FLOAT *y_ptr;
	FLOAT *ap[4];
	BLASLONG n1;
	BLASLONG m1;
	BLASLONG m2;
	BLASLONG m3;
	BLASLONG n2;
	BLASLONG lda4 =  lda << 2;
	BLASLONG lda8 =  lda << 3;
	FLOAT xbuffer[8] __attribute__((aligned(16)));
	FLOAT *ybuffer;

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

	ybuffer = buffer;
	
        if ( inc_x == 1 )
	{
		n1 = n >> 3 ;
		n2 = n &  7 ;
	}
	else
	{
		n1 = n >> 2 ;
		n2 = n &  3 ;

	}
	
        m3 = m & 3  ;
        m1 = m & -4 ;
        m2 = (m & (NBMAX-1)) - m3 ;


	y_ptr = y;

	BLASLONG NB = NBMAX;

	while ( NB == NBMAX )
	{
		
		m1 -= NB;
		if ( m1 < 0)
		{
			if ( m2 == 0 ) break;	
			NB = m2;
		}
		
		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_y != 1 )
			memset(ybuffer,0,NB*4);
		else
			ybuffer = y_ptr;

		if ( inc_x == 1 )
		{


			for( i = 0; i < n1 ; i++)
			{
				sgemv_kernel_4x8(NB,ap,x_ptr,ybuffer,lda4,&alpha);
				ap[0] += lda8; 
				ap[1] += lda8; 
				ap[2] += lda8; 
				ap[3] += lda8; 
				a_ptr += lda8;
				x_ptr += 8;	
			}


			if ( n2 & 4 )
			{
				sgemv_kernel_4x4(NB,ap,x_ptr,ybuffer,&alpha);
				ap[0] += lda4; 
				ap[1] += lda4; 
				ap[2] += lda4; 
				ap[3] += lda4; 
				a_ptr += lda4;
				x_ptr += 4;	
			}

			if ( n2 & 2 )
			{
				sgemv_kernel_4x2(NB,ap,x_ptr,ybuffer,&alpha);
				a_ptr += lda*2;
				x_ptr += 2;	
			}


			if ( n2 & 1 )
			{
				sgemv_kernel_4x1(NB,a_ptr,x_ptr,ybuffer,&alpha); 
                a_ptr += lda;
                x_ptr += 1;   
			}


		}
		else
		{

			for( i = 0; i < n1 ; i++)
			{
				xbuffer[0] = x_ptr[0];
				x_ptr += inc_x;	
				xbuffer[1] =  x_ptr[0];
				x_ptr += inc_x;	
				xbuffer[2] =  x_ptr[0];
				x_ptr += inc_x;	
				xbuffer[3] = x_ptr[0];
				x_ptr += inc_x;	
				sgemv_kernel_4x4(NB,ap,xbuffer,ybuffer,&alpha);
				ap[0] += lda4; 
				ap[1] += lda4; 
				ap[2] += lda4; 
				ap[3] += lda4; 
				a_ptr += lda4;
			}

			for( i = 0; i < n2 ; i++)
			{
				xbuffer[0] = x_ptr[0];
				x_ptr += inc_x;	
				sgemv_kernel_4x1(NB,a_ptr,xbuffer,ybuffer,&alpha);
				a_ptr += lda;

			}

		}

		a     += NB;
		if ( inc_y != 1 )
		{
			add_y(NB,ybuffer,y_ptr,inc_y);
			y_ptr += NB * inc_y;
		}
		else
			y_ptr += NB ;

	}

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

	if ( m3 == 3 )
	{
		a_ptr = a;
		x_ptr = x;
		FLOAT temp0 = 0.0;
		FLOAT temp1 = 0.0;
		FLOAT temp2 = 0.0;
		if ( lda == 3 && inc_x ==1 )
		{

			for( i = 0; i < ( n & -4 ); i+=4 )
			{

				temp0 += a_ptr[0] * x_ptr[0] + a_ptr[3] * x_ptr[1];
				temp1 += a_ptr[1] * x_ptr[0] + a_ptr[4] * x_ptr[1];
				temp2 += a_ptr[2] * x_ptr[0] + a_ptr[5] * x_ptr[1];

				temp0 += a_ptr[6] * x_ptr[2] + a_ptr[9]  * x_ptr[3];
				temp1 += a_ptr[7] * x_ptr[2] + a_ptr[10] * x_ptr[3];
				temp2 += a_ptr[8] * x_ptr[2] + a_ptr[11] * x_ptr[3];

				a_ptr += 12;
				x_ptr += 4;
			}

			for( ; i < n; i++ )
			{
				temp0 += a_ptr[0] * x_ptr[0];
				temp1 += a_ptr[1] * x_ptr[0];
				temp2 += a_ptr[2] * x_ptr[0];
				a_ptr += 3;
				x_ptr ++;
			}

		}
		else
		{

			for( i = 0; i < n; i++ )
			{
				temp0 += a_ptr[0] * x_ptr[0];
				temp1 += a_ptr[1] * x_ptr[0];
				temp2 += a_ptr[2] * x_ptr[0];
				a_ptr += lda;
				x_ptr += inc_x;


			}

		}
		y_ptr[0] += alpha * temp0;
		y_ptr += inc_y;
		y_ptr[0] += alpha * temp1;
		y_ptr += inc_y;
		y_ptr[0] += alpha * temp2;
		return(0);
	}


	if ( m3 == 2 )
	{
		a_ptr = a;
		x_ptr = x;
		FLOAT temp0 = 0.0;
		FLOAT temp1 = 0.0;
		if ( lda == 2 && inc_x ==1 )
		{

			for( i = 0; i < (n & -4) ; i+=4 )
			{
				temp0 += a_ptr[0] * x_ptr[0] + a_ptr[2] * x_ptr[1];
				temp1 += a_ptr[1] * x_ptr[0] + a_ptr[3] * x_ptr[1];
				temp0 += a_ptr[4] * x_ptr[2] + a_ptr[6] * x_ptr[3];
				temp1 += a_ptr[5] * x_ptr[2] + a_ptr[7] * x_ptr[3];
				a_ptr += 8;
				x_ptr += 4;

			}


			for( ; i < n; i++ )
			{
				temp0 += a_ptr[0]   * x_ptr[0];
				temp1 += a_ptr[1]   * x_ptr[0];
				a_ptr += 2;
				x_ptr ++;
			}

		}
		else
		{

			for( i = 0; i < n; i++ )
			{
				temp0 += a_ptr[0] * x_ptr[0];
				temp1 += a_ptr[1] * x_ptr[0];
				a_ptr += lda;
				x_ptr += inc_x;


			}

		}
		y_ptr[0] += alpha * temp0;
		y_ptr += inc_y;
		y_ptr[0] += alpha * temp1;
		return(0);
	}

	if ( m3 == 1 )
	{
		a_ptr = a;
		x_ptr = x;
		FLOAT temp = 0.0;
		if ( lda == 1 && inc_x ==1 )
		{

			for( i = 0; i < (n & -4); i+=4 )
			{
				temp += a_ptr[i] * x_ptr[i] + a_ptr[i+1] * x_ptr[i+1] + a_ptr[i+2] * x_ptr[i+2] + a_ptr[i+3] * x_ptr[i+3];
	
			}

			for( ; i < n; i++ )
			{
				temp += a_ptr[i] * x_ptr[i];
			}

		}
		else
		{

			for( i = 0; i < n; i++ )
			{
				temp += a_ptr[0] * x_ptr[0];
				a_ptr += lda;
				x_ptr += inc_x;
			}

		}
		y_ptr[0] += alpha * temp;
		return(0);
	}


	return(0);
}

#endif