OpenBLAS/kernel/zarch/dsdot.c

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#include "common.h"

static double dsdot_kernel_16(BLASLONG n, FLOAT *x, FLOAT *y)
{
    double 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"

        "vlef  %%v16,0(%%r1,%2),0        \n\t"
        "vlef  %%v16,4(%%r1,%2),2        \n\t"
        "vlef  %%v17,8(%%r1,%2),0        \n\t"
        "vlef  %%v17,12(%%r1,%2),2       \n\t"
        "vlef  %%v18,16(%%r1,%2),0       \n\t"
        "vlef  %%v18,20(%%r1,%2),2       \n\t"
        "vlef  %%v19,24(%%r1,%2),0       \n\t"
        "vlef  %%v19,28(%%r1,%2),2       \n\t"
        "vlef  %%v20,32(%%r1,%2),0       \n\t"
        "vlef  %%v20,36(%%r1,%2),2       \n\t"
        "vlef  %%v21,40(%%r1,%2),0       \n\t"
        "vlef  %%v21,44(%%r1,%2),2       \n\t"
        "vlef  %%v22,48(%%r1,%2),0       \n\t"
        "vlef  %%v22,52(%%r1,%2),2       \n\t"
        "vlef  %%v23,56(%%r1,%2),0       \n\t"
        "vlef  %%v23,60(%%r1,%2),2       \n\t"

        "vflls   %%v16,%%v16             \n\t"
        "vflls   %%v17,%%v17             \n\t"
        "vflls   %%v18,%%v18             \n\t"
        "vflls   %%v19,%%v19             \n\t"
        "vflls   %%v20,%%v20             \n\t"
        "vflls   %%v21,%%v21             \n\t"
        "vflls   %%v22,%%v22             \n\t"
        "vflls   %%v23,%%v23             \n\t"

        "vlef    %%v24,0(%%r1,%3),0      \n\t"
        "vlef    %%v24,4(%%r1,%3),2      \n\t"
        "vflls   %%v24,%%v24             \n\t"
        "vfmadb  %%v0,%%v16,%%v24,%%v0   \n\t"
        "vlef    %%v25,8(%%r1,%3),0      \n\t"
        "vlef    %%v25,12(%%r1,%3),2     \n\t"
        "vflls   %%v25,%%v25             \n\t"
        "vfmadb  %%v0,%%v17,%%v25,%%v0   \n\t"
        "vlef    %%v26,16(%%r1,%3),0     \n\t"
        "vlef    %%v26,20(%%r1,%3),2     \n\t"
        "vflls   %%v26,%%v26             \n\t"
        "vfmadb  %%v0,%%v18,%%v26,%%v0   \n\t"
        "vlef    %%v27,24(%%r1,%3),0     \n\t"
        "vlef    %%v27,28(%%r1,%3),2     \n\t"
        "vflls   %%v27,%%v27             \n\t"
        "vfmadb  %%v0,%%v19,%%v27,%%v0   \n\t"
        "vlef    %%v28,32(%%r1,%3),0     \n\t"
        "vlef    %%v28,36(%%r1,%3),2     \n\t"
        "vflls   %%v28,%%v28             \n\t"
        "vfmadb  %%v0,%%v20,%%v28,%%v0   \n\t"
        "vlef    %%v29,40(%%r1,%3),0     \n\t"
        "vlef    %%v29,44(%%r1,%3),2     \n\t"
        "vflls   %%v29,%%v29             \n\t"
        "vfmadb  %%v0,%%v21,%%v29,%%v0   \n\t"
        "vlef    %%v30,48(%%r1,%3),0     \n\t"
        "vlef    %%v30,52(%%r1,%3),2     \n\t"
        "vflls   %%v30,%%v30             \n\t"
        "vfmadb  %%v0,%%v22,%%v30,%%v0   \n\t"
        "vlef    %%v31,56(%%r1,%3),0     \n\t"
        "vlef    %%v31,60(%%r1,%3),2     \n\t"
        "vflls   %%v31,%%v31             \n\t"    
        "vfmadb  %%v0,%%v23,%%v31,%%v0   \n\t"

        "agfi   %%r1,64                  \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","v2","v3","v16","v17","v18","v19","v20","v21","v22","v23","v24","v25","v26","v27","v28","v29","v30","v31"
    );

    return dot;
}

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

	double  dot = 0.0 ;

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

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

		BLASLONG n1 = n & -16;

		if ( n1 )
			dot = dsdot_kernel_16(n1,x,y);

		i = n1;
		while(i < n)
		{

			dot += (double) y[i] * (double) x[i] ;
			i++ ;

		}
		return(dot);


	}

	BLASLONG n1 = n & -2;

	while(i < n1)
	{

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

	}

	while(i < n)
	{

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

	}
	return(dot);

}