OpenBLAS/kernel/zarch/dcopy.c

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#include "common.h"

static void dcopy_kernel_32(BLASLONG n, FLOAT *x, FLOAT *y) {
  __asm__("srlg %[n],%[n],5\n\t"
    "0:\n\t"
    "pfd 1, 1024(%[x])\n\t"
    "pfd 2, 1024(%[y])\n\t"
    "mvc 0(256,%[y]),0(%[x])\n\t"
    "la  %[x],256(%[x])\n\t"
    "la  %[y],256(%[y])\n\t"
    "brctg %[n],0b"
    : "=m"(*(FLOAT (*)[n]) y),[x] "+&a"(x),[y] "+&a"(y),[n] "+&r"(n)
    : "m"(*(const FLOAT (*)[n]) x)
    : "cc");
}

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;

}