/***************************************************************************
Copyright (c) 2013-2019, The OpenBLAS Project
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modification, are permitted provided that the following conditions are
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2. Redistributions in binary form must reproduce the above copyright
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its contributors may be used to endorse or promote products
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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*****************************************************************************/

#include "common.h"

static void daxpy_kernel_32(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *alpha) {
  __asm__("vlrepg %%v0,%[alpha]\n\t"
    "srlg  %[n],%[n],5\n\t"
    "xgr   %%r1,%%r1\n\t"
    "0:\n\t"
    "pfd 1, 1024(%%r1,%[x])\n\t"
    "pfd 2, 1024(%%r1,%[y])\n\t"
    "vl  %%v16,0(%%r1,%[x])\n\t"
    "vl  %%v17,16(%%r1,%[x])\n\t"
    "vl  %%v18,32(%%r1,%[x])\n\t"
    "vl  %%v19,48(%%r1,%[x])\n\t"
    "vl  %%v20,0(%%r1,%[y])\n\t"
    "vl  %%v21,16(%%r1,%[y])\n\t"
    "vl  %%v22,32(%%r1,%[y])\n\t"
    "vl  %%v23,48(%%r1,%[y])\n\t"
    "vl  %%v24,64(%%r1,%[x])\n\t"
    "vl  %%v25,80(%%r1,%[x])\n\t"
    "vl  %%v26,96(%%r1,%[x])\n\t"
    "vl  %%v27,112(%%r1,%[x])\n\t"
    "vl  %%v28,64(%%r1,%[y])\n\t"
    "vl  %%v29,80(%%r1,%[y])\n\t"
    "vl  %%v30,96(%%r1,%[y])\n\t"
    "vl  %%v31,112(%%r1,%[y])\n\t"
    "vfmadb   %%v16,%%v0,%%v16,%%v20\n\t"
    "vfmadb   %%v17,%%v0,%%v17,%%v21\n\t"
    "vfmadb   %%v18,%%v0,%%v18,%%v22\n\t"
    "vfmadb   %%v19,%%v0,%%v19,%%v23\n\t"
    "vfmadb   %%v24,%%v0,%%v24,%%v28\n\t"
    "vfmadb   %%v25,%%v0,%%v25,%%v29\n\t"
    "vfmadb   %%v26,%%v0,%%v26,%%v30\n\t"
    "vfmadb   %%v27,%%v0,%%v27,%%v31\n\t"
    "vst  %%v16,0(%%r1,%[y])\n\t"
    "vst  %%v17,16(%%r1,%[y])\n\t"
    "vst  %%v18,32(%%r1,%[y])\n\t"
    "vst  %%v19,48(%%r1,%[y])\n\t"
    "vst  %%v24,64(%%r1,%[y])\n\t"
    "vst  %%v25,80(%%r1,%[y])\n\t"
    "vst  %%v26,96(%%r1,%[y])\n\t"
    "vst  %%v27,112(%%r1,%[y])\n\t"
    "vl  %%v16,128(%%r1,%[x])\n\t"
    "vl  %%v17,144(%%r1,%[x])\n\t"
    "vl  %%v18,160(%%r1,%[x])\n\t"
    "vl  %%v19,176(%%r1,%[x])\n\t"
    "vl  %%v20,128(%%r1,%[y])\n\t"
    "vl  %%v21,144(%%r1,%[y])\n\t"
    "vl  %%v22,160(%%r1,%[y])\n\t"
    "vl  %%v23,176(%%r1,%[y])\n\t"
    "vl  %%v24,192(%%r1,%[x])\n\t"
    "vl  %%v25,208(%%r1,%[x])\n\t"
    "vl  %%v26,224(%%r1,%[x])\n\t"
    "vl  %%v27,240(%%r1,%[x])\n\t"
    "vl  %%v28,192(%%r1,%[y])\n\t"
    "vl  %%v29,208(%%r1,%[y])\n\t"
    "vl  %%v30,224(%%r1,%[y])\n\t"
    "vl  %%v31,240(%%r1,%[y])\n\t"
    "vfmadb   %%v16,%%v0,%%v16,%%v20\n\t"
    "vfmadb   %%v17,%%v0,%%v17,%%v21\n\t"
    "vfmadb   %%v18,%%v0,%%v18,%%v22\n\t"
    "vfmadb   %%v19,%%v0,%%v19,%%v23\n\t"
    "vfmadb   %%v24,%%v0,%%v24,%%v28\n\t"
    "vfmadb   %%v25,%%v0,%%v25,%%v29\n\t"
    "vfmadb   %%v26,%%v0,%%v26,%%v30\n\t"
    "vfmadb   %%v27,%%v0,%%v27,%%v31\n\t"
    "vst  %%v16,128(%%r1,%[y])\n\t"
    "vst  %%v17,144(%%r1,%[y])\n\t"
    "vst  %%v18,160(%%r1,%[y])\n\t"
    "vst  %%v19,176(%%r1,%[y])\n\t"
    "vst  %%v24,192(%%r1,%[y])\n\t"
    "vst  %%v25,208(%%r1,%[y])\n\t"
    "vst  %%v26,224(%%r1,%[y])\n\t"
    "vst  %%v27,240(%%r1,%[y])\n\t"
    "agfi  %%r1,256\n\t"
    "brctg %[n],0b"
    : "+m"(*(struct { FLOAT x[n]; } *) y),[n] "+&r"(n)
    : [y] "a"(y), "m"(*(const struct { FLOAT x[n]; } *) x),[x] "a"(x),
       [alpha] "Q"(*alpha)
    : "cc", "r1", "v0", "v16", "v17", "v18", "v19", "v20", "v21", "v22",
       "v23", "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31");
}

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;
  BLASLONG ix = 0, iy = 0;

  if (n <= 0)
    return 0;

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

    BLASLONG n1 = n & -32;

    if (n1)
      daxpy_kernel_32(n1, x, y, &da);

    i = n1;
    while (i < n) {

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

    }
    return 0;

  }

  BLASLONG n1 = n & -4;

  while (i < n1) {

    FLOAT m1 = da * x[ix];
    FLOAT m2 = da * x[ix + inc_x];
    FLOAT m3 = da * x[ix + 2 * inc_x];
    FLOAT m4 = da * x[ix + 3 * inc_x];

    y[iy] += m1;
    y[iy + inc_y] += m2;
    y[iy + 2 * inc_y] += m3;
    y[iy + 3 * inc_y] += m4;

    ix += inc_x * 4;
    iy += inc_y * 4;
    i += 4;

  }

  while (i < n) {

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

  }
  return 0;

}
