OpenBLAS/kernel/zarch/sdot.c

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#include "common.h"

static FLOAT sdot_kernel_32(BLASLONG n, FLOAT *x, FLOAT *y)
{
    FLOAT dot;

    __asm__ volatile (   
        "vzero %%v0                      \n\t"
        "srlg  %%r0,%1,5                 \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"
        "vfmasb   %%v0,%%v16,%%v24,%%v0  \n\t"
        "vl  %%v25,16(%%r1,%3)           \n\t"
        "vfmasb   %%v0,%%v17,%%v25,%%v0  \n\t"
        "vl  %%v26,32(%%r1,%3)           \n\t"
        "vfmasb   %%v0,%%v18,%%v26,%%v0  \n\t"
        "vl  %%v27,48(%%r1,%3)           \n\t"
        "vfmasb   %%v0,%%v19,%%v27,%%v0  \n\t"
        "vl  %%v28,64(%%r1,%3)           \n\t"
        "vfmasb   %%v0,%%v20,%%v28,%%v0  \n\t"
        "vl  %%v29,80(%%r1,%3)           \n\t"
        "vfmasb   %%v0,%%v21,%%v29,%%v0  \n\t"
        "vl  %%v30,96(%%r1,%3)           \n\t"
        "vfmasb   %%v0,%%v22,%%v30,%%v0  \n\t"
        "vl  %%v31,112(%%r1,%3)          \n\t"
        "vfmasb   %%v0,%%v23,%%v31,%%v0  \n\t"
        
        "agfi   %%r1,128                 \n\t"
        "brctg  %%r0,0b                  \n\t"
        "vrepf  %%v1,%%v0,1              \n\t"
        "vrepf  %%v2,%%v0,2              \n\t"
        "vrepf  %%v3,%%v0,3              \n\t"
        "aebr   %%f0,%%f1                \n\t"
        "aebr   %%f0,%%f2                \n\t"
        "aebr   %%f0,%%f3                \n\t"
        "ler    %0,%%f0                      "
        :"=f"(dot)
        :"r"(n),"ZR"((const FLOAT (*)[n])x),"ZR"((const FLOAT (*)[n])y)
        :"memory","cc","r0","r1","v0","v1","v2","v3","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 & -32;

		if ( n1 )
			dot = sdot_kernel_32(n1,x,y);

		i = n1;
		while(i < n)
		{

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

		}
		return(dot);


	}

	BLASLONG n1 = n & -2;

	while(i < n1)
	{

		dot += y[iy] * x[ix] + y[iy+inc_y] * x[ix+inc_x];
		ix  += inc_x*2 ;
		iy  += inc_y*2 ;
		i+=2 ;

	}

	while(i < n)
	{

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

	}
	return(dot);

}