OpenBLAS/kernel/zarch/ddot.c

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*****************************************************************************/


#include "common.h"


#if  defined(Z13)
static void __attribute__ ((noinline))   ddot_kernel_8(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *d)
{
   
                 __asm__ volatile( 
                    "pfd 1, 0(%1) \n\t"
                    "pfd 1, 0(%2) \n\t"      
                    "vzero %%v24  \n\t"
                    "vzero %%v25  \n\t" 
                    "vzero %%v26  \n\t"
                    "vzero %%v27  \n\t"                  
                    "srlg  %%r0,%0,4    \n\t" 
                    "xgr   %%r1,%%r1    \n\t"
                    ".align 16 \n\t"    
                    "1: \n\t"
                    "pfd 1, 256(%%r1,%1) \n\t"
                    "pfd 1, 256(%%r1,%2) \n\t"                
                    "vl  %%v16, 0(%%r1,%1)  \n\t"
                    "vl  %%v17, 16(%%r1,%1) \n\t"
                    "vl  %%v18, 32(%%r1,%1) \n\t"
                    "vl  %%v19, 48(%%r1,%1) \n\t"

                    "vl  %%v28, 0(%%r1,%2) \n\t"
                    "vfmadb    %%v24,%%v16,%%v28,%%v24  \n\t"  
                    "vl  %%v29, 16(%%r1,%2) \n\t"
                    "vfmadb    %%v25,%%v17,%%v29,%%v25  \n\t"   
             
                    "vl  %%v30, 32(%%r1,%2) \n\t"
                    "vfmadb    %%v26,%%v18,%%v30,%%v26  \n\t"      
                    "vl  %%v31, 48(%%r1,%2) \n\t" 
                    "vfmadb    %%v27,%%v19,%%v31,%%v27  \n\t"   
         
                    "vl  %%v16, 64(%%r1,%1)  \n\t"
                    "vl  %%v17, 80(%%r1,%1)  \n\t"
                    "vl  %%v18, 96(%%r1,%1)  \n\t"
                    "vl  %%v19, 112(%%r1,%1) \n\t"

                    "vl  %%v28, 64(%%r1,%2) \n\t"
                    "vfmadb    %%v24,%%v16,%%v28,%%v24  \n\t"  
                    "vl  %%v29, 80(%%r1,%2) \n\t"
                    "vfmadb    %%v25,%%v17,%%v29,%%v25  \n\t"  
                  
             
                    "vl  %%v30, 96(%%r1,%2)  \n\t"
                    "vfmadb    %%v26,%%v18,%%v30,%%v26  \n\t" 
                    "vl  %%v31, 112(%%r1,%2) \n\t" 
                    "vfmadb    %%v27,%%v19,%%v31,%%v27  \n\t"  
                     
                    
                    "la %%r1,128(%%r1) \n\t"
                    "brctg %%r0,1b \n\t"
                    "vfadb   %%v24,%%v25,%%v24    \n\t"
                    "vfadb   %%v24,%%v26,%%v24    \n\t"
                    "vfadb   %%v24,%%v27,%%v24    \n\t"                 
                    "vrepg   %%v1,%%v24,1         \n\t"
                    "vfadb   %%v1,%%v24,%%v1      \n\t"  
                    " std    %%f1,0(%3)           \n\t"  
                    :
                    :"r"(n),"a"(x),"a"(y),"a"(d)
                    :"cc" , "memory" ,"r0","r1","v16", "v17","v18","v19","v20","v21","v22","v23",
                    "v24","v25","v26","v27","v28","v29","v30","v31"

                 );

}


#else

static void ddot_kernel_8(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *d)
{
    BLASLONG register i = 0;
    FLOAT dot = 0.0;

    while(i < n)
        {
              dot += y[i]  * x[i]
                  + y[i+1] * x[i+1]
                  + y[i+2] * x[i+2]
                  + y[i+3] * x[i+3]
                  + y[i+4] * x[i+4]
                  + y[i+5] * x[i+5]
                  + y[i+6] * x[i+6]
                  + y[i+7] * x[i+7] ;

              i+=8 ;

       }
       *d += dot;

}

#endif

FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
{
    BLASLONG i=0;
    BLASLONG ix=0,iy=0;

    FLOAT  dot = 0.0 ;

    if ( n <= 0 )  return(dot);

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

        BLASLONG n1 = n & -16;

        if ( n1 )
            ddot_kernel_8(n1, x, y , &dot );

        i = n1;
        while(i < n)
        {

            dot += y[i] * x[i] ;
            i++ ;

        } 
        return(dot);


    }

    FLOAT temp1 = 0.0;
    FLOAT temp2 = 0.0;

    BLASLONG n1 = n & -4;    

    while(i < n1)
    {

        FLOAT m1 = y[iy]       * x[ix] ;
        FLOAT m2 = y[iy+inc_y] * x[ix+inc_x] ;

        FLOAT m3 = y[iy+2*inc_y] * x[ix+2*inc_x] ;
        FLOAT m4 = y[iy+3*inc_y] * x[ix+3*inc_x] ;

        ix  += inc_x*4 ;
        iy  += inc_y*4 ;

        temp1 += m1+m3;
        temp2 += m2+m4;

        i+=4 ;

    }

    while(i < n)
    {

        temp1 += y[iy] * x[ix] ;
        ix  += inc_x ;
        iy  += inc_y ;
        i++ ;

    }
    dot = temp1 + temp2;
    return(dot);

}