OpenBLAS/kernel/zarch/dscal.c

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#include "common.h"

static void dscal_kernel_16(BLASLONG n, FLOAT da, FLOAT *x) {
  __asm__("vlrepg %%v0,%[da]\n\t"
    "srlg  %[n],%[n],4\n\t"
    "xgr   %%r1,%%r1\n\t"
    "0:\n\t"
    "pfd 2, 1024(%%r1,%[x])\n\t"
    "vl    %%v24,0(%%r1,%[x])\n\t"
    "vfmdb %%v24,%%v24,%%v0\n\t"
    "vst   %%v24,0(%%r1,%[x])\n\t"
    "vl    %%v25,16(%%r1,%[x])\n\t"
    "vfmdb %%v25,%%v25,%%v0\n\t"
    "vst   %%v25,16(%%r1,%[x])\n\t"
    "vl    %%v26,32(%%r1,%[x])\n\t"
    "vfmdb %%v26,%%v26,%%v0\n\t"
    "vst   %%v26,32(%%r1,%[x])\n\t"
    "vl    %%v27,48(%%r1,%[x])\n\t"
    "vfmdb %%v27,%%v27,%%v0\n\t"
    "vst   %%v27,48(%%r1,%[x])\n\t"
    "vl    %%v28,64(%%r1,%[x])\n\t"
    "vfmdb %%v28,%%v28,%%v0\n\t"
    "vst   %%v28,64(%%r1,%[x])\n\t"
    "vl    %%v29,80(%%r1,%[x])\n\t"
    "vfmdb %%v29,%%v29,%%v0\n\t"
    "vst   %%v29,80(%%r1,%[x])\n\t"
    "vl    %%v30,96(%%r1,%[x])\n\t"
    "vfmdb %%v30,%%v30,%%v0\n\t"
    "vst   %%v30,96(%%r1,%[x])\n\t"
    "vl    %%v31,112(%%r1,%[x])\n\t"
    "vfmdb %%v31,%%v31,%%v0\n\t"
    "vst   %%v31,112(%%r1,%[x])\n\t"
    "agfi   %%r1,128\n\t"
    "brctg  %[n],0b"
    : "+m"(*(FLOAT (*)[n]) x),[n] "+&r"(n)
    : [x] "a"(x),[da] "Q"(da)
    : "cc", "r1", "v0", "v24", "v25", "v26", "v27", "v28", "v29", "v30",
       "v31");
}

static void dscal_kernel_16_zero(BLASLONG n, FLOAT *x) {
  __asm__("vzero %%v0\n\t"
    "srlg %[n],%[n],4\n\t"
    "xgr   %%r1,%%r1\n\t"
    "0:\n\t"
    "pfd 2, 1024(%%r1,%[x])\n\t"
    "vst  %%v0,0(%%r1,%[x])\n\t"
    "vst  %%v0,16(%%r1,%[x])\n\t"
    "vst  %%v0,32(%%r1,%[x])\n\t"
    "vst  %%v0,48(%%r1,%[x])\n\t"
    "vst  %%v0,64(%%r1,%[x])\n\t"
    "vst  %%v0,80(%%r1,%[x])\n\t"
    "vst  %%v0,96(%%r1,%[x])\n\t"
    "vst  %%v0,112(%%r1,%[x])\n\t"
    "agfi  %%r1,128\n\t"
    "brctg %[n],0b"
    : "=m"(*(FLOAT (*)[n]) x),[n] "+&r"(n)
    : [x] "a"(x)
    : "cc", "r1", "v0");
}

int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT da, FLOAT *x,
          BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *dummy,
          BLASLONG dummy2) {
  BLASLONG i = 0, j = 0;
  if (n <= 0 || inc_x <= 0)
    return (0);

  if (inc_x == 1) {

    if (da == 0.0) {

      BLASLONG n1 = n & -16;
      if (n1 > 0) {

        dscal_kernel_16_zero(n1, x);
        j = n1;
      }

      while (j < n) {

        x[j] = 0.0;
        j++;
      }

    } else {

      BLASLONG n1 = n & -16;
      if (n1 > 0) {
        dscal_kernel_16(n1, da, x);
        j = n1;
      }
      while (j < n) {

        x[j] = da * x[j];
        j++;
      }
    }

  } else {

    if (da == 0.0) {

      BLASLONG n1 = n & -4;

      while (j < n1) {

        x[i] = 0.0;
        x[i + inc_x] = 0.0;
        x[i + 2 * inc_x] = 0.0;
        x[i + 3 * inc_x] = 0.0;

        i += inc_x * 4;
        j += 4;

      }
      while (j < n) {

        x[i] = 0.0;
        i += inc_x;
        j++;
      }

    } else {
      BLASLONG n1 = n & -4;

      while (j < n1) {

        x[i] = da * x[i];
        x[i + inc_x] = da * x[i + inc_x];
        x[i + 2 * inc_x] = da * x[i + 2 * inc_x];
        x[i + 3 * inc_x] = da * x[i + 3 * inc_x];

        i += inc_x * 4;
        j += 4;

      }

      while (j < n) {

        x[i] = da * x[i];
        i += inc_x;
        j++;
      }
    }

  }
  return 0;

}