OpenBLAS/kernel/zarch/ddot.c

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

#include "common.h"

static FLOAT ddot_kernel_16(BLASLONG n, FLOAT *x, FLOAT *y)
{
    FLOAT dot;

    __asm__ volatile (   
        "vzero %%v0                      \n\t"
        "srlg  %%r0,%1,4                 \n\t"
        "xgr   %%r1,%%r1                 \n\t"
        "0:                              \n\t"
        "pfd 1,1024(%%r1,%2)             \n\t"
        "pfd 1,1024(%%r1,%3)             \n\t"

        "vl  %%v16,0(%%r1,%2)            \n\t"
        "vl  %%v17,16(%%r1,%2)           \n\t"
        "vl  %%v18,32(%%r1,%2)           \n\t"
        "vl  %%v19,48(%%r1,%2)           \n\t"
        "vl  %%v20,64(%%r1,%2)           \n\t"
        "vl  %%v21,80(%%r1,%2)           \n\t"
        "vl  %%v22,96(%%r1,%2)           \n\t"
        "vl  %%v23,112(%%r1,%2)          \n\t"

        "vl  %%v24,0(%%r1,%3)            \n\t"
        "vfmadb   %%v0,%%v16,%%v24,%%v0  \n\t"
        "vl  %%v25,16(%%r1,%3)           \n\t"
        "vfmadb   %%v0,%%v17,%%v25,%%v0  \n\t"
        "vl  %%v26,32(%%r1,%3)           \n\t"
        "vfmadb   %%v0,%%v18,%%v26,%%v0  \n\t"
        "vl  %%v27,48(%%r1,%3)           \n\t"
        "vfmadb   %%v0,%%v19,%%v27,%%v0  \n\t"
        "vl  %%v28,64(%%r1,%3)           \n\t"
        "vfmadb   %%v0,%%v20,%%v28,%%v0  \n\t"
        "vl  %%v29,80(%%r1,%3)           \n\t"
        "vfmadb   %%v0,%%v21,%%v29,%%v0  \n\t"
        "vl  %%v30,96(%%r1,%3)           \n\t"
        "vfmadb   %%v0,%%v22,%%v30,%%v0  \n\t"
        "vl  %%v31,112(%%r1,%3)          \n\t"
        "vfmadb   %%v0,%%v23,%%v31,%%v0  \n\t"
        
        "agfi   %%r1,128                 \n\t"
        "brctg  %%r0,0b                  \n\t"
        "vrepg  %%v1,%%v0,1              \n\t"
        "adbr   %%f0,%%f1                \n\t"
        "ldr    %0,%%f0                      "
        :"=f"(dot)
        :"r"(n),"ZR"((const FLOAT (*)[n])x),"ZR"((const FLOAT (*)[n])y)
        :"memory","cc","r0","r1","v0","v1","v16","v17","v18","v19","v20","v21","v22","v23","v24","v25","v26","v27","v28","v29","v30","v31"
    );

    return dot;
}

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);

}