OpenBLAS/kernel/zarch/ddot.c

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#include "common.h"


#if  defined(Z13)
static  FLOAT  ddot_kernel_16(BLASLONG n, FLOAT *x, FLOAT *y)
{
    FLOAT dot;
         __asm__ volatile( 
            "pfd   1, 0(%[ptr_x_tmp]) \n\t"
            "pfd   1, 0(%[ptr_y_tmp]) \n\t"      
            "vzero %%v24  \n\t"
            "vzero %%v25  \n\t" 
            "vzero %%v26  \n\t"
            "vzero %%v27  \n\t"                  
            "srlg  %[n_tmp],%[n_tmp],4    \n\t" 
            "xgr   %%r1,%%r1    \n\t"
            ".align 16 \n\t"    
            "1:    \n\t"
            "pfd    1,    256(%%r1,%[ptr_x_tmp]) \n\t"
            "pfd    1,    256(%%r1,%[ptr_y_tmp]) \n\t"                
            "vl     %%v16,  0(%%r1,%[ptr_x_tmp]) \n\t"
            "vl     %%v17, 16(%%r1,%[ptr_x_tmp]) \n\t"
            "vl     %%v18, 32(%%r1,%[ptr_x_tmp]) \n\t"
            "vl     %%v19, 48(%%r1,%[ptr_x_tmp]) \n\t"

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

            "vl     %%v28, 64(%%r1,%[ptr_y_tmp]) \n\t"
            "vfmadb %%v24,%%v16,%%v28,%%v24      \n\t"  
            "vl     %%v29, 80(%%r1,%[ptr_y_tmp]) \n\t"
            "vfmadb %%v25,%%v17,%%v29,%%v25      \n\t"  
          
     
            "vl     %%v30, 96(%%r1,%[ptr_y_tmp])  \n\t"
            "vfmadb %%v26,%%v18,%%v30,%%v26       \n\t" 
            "vl     %%v31, 112(%%r1,%[ptr_y_tmp]) \n\t" 
            "vfmadb %%v27,%%v19,%%v31,%%v27       \n\t"  
             
            
            "la     %%r1,128(%%r1) \n\t"
            "brctg  %[n_tmp],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"  
            "ldr    %[dot],  %%f1     \n\t"  
            : [dot] "=f"(dot) ,[n_tmp] "+&r"(n)
            : [mem_x] "m"( *(const double (*)[n])x),
              [mem_y] "m"( *(const double (*)[n])y),
              [ptr_x_tmp]"a"(x), [ptr_y_tmp] "a"(y) 
            :"cc" , "r1","f1","v16", "v17","v18","v19","v20","v21","v22","v23",
            "v24","v25","v26","v27","v28","v29","v30","v31"

         );
    return dot;        

}


#else

static FLOAT ddot_kernel_16(BLASLONG n, FLOAT *x, FLOAT *y )
{
    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] ;
            dot +=  y[i+8]  * x[i+8]
                  + y[i+9] * x[i+9]
                  + y[i+10] * x[i+10]
                  + y[i+11] * x[i+11]
                  + y[i+12] * x[i+12]
                  + y[i+13] * x[i+13]
                  + y[i+14] * x[i+14]
                  + y[i+15] * x[i+15] ;
    

            i+=16 ;

       }
    return 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 ){
            dot = ddot_kernel_16(n1, x, y  );
            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);

}