OpenBLAS/kernel/zarch/dcopy.c

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#include "common.h"

static void dcopy_kernel_32(BLASLONG n, FLOAT *x, FLOAT *y)
{
    __asm__ volatile (
        "lgr  %%r1,%1            \n\t"
        "lgr  %%r2,%2            \n\t"
        "srlg %%r0,%0,5          \n\t"
        "0:                      \n\t"
        "pfd 1, 1024(%%r1)       \n\t"
        "pfd 2, 1024(%%r2)       \n\t"
        "mvc 0(256,%%r2),0(%%r1) \n\t"
        "agfi   %%r1,256         \n\t"
        "agfi   %%r2,256         \n\t"
        "brctg %%r0,0b               "
        :
        :"r"(n),"a"((const FLOAT (*)[n])x),"a"((FLOAT (*)[n])y)
        :"memory","cc","r0","r1","r2"
    );
}

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

    if (n <= 0) return 0;

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

        BLASLONG n1 = n & -32;
        if (n1 > 0) {
            dcopy_kernel_32(n1, x, y);
            i = n1;
        }

        while (i < n) {
            y[i] = x[i];
            i++;

        }


    } else {

        while (i < n) {

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

        }

    }
    return 0;


}