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its contributors may be used to endorse or promote products
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*****************************************************************************/

#include "common.h"

static void cswap_kernel_32(BLASLONG n, FLOAT *x, FLOAT *y) {
  __asm__("srlg %[n],%[n],5\n\t"
    "xgr  %%r1,%%r1\n\t"
    "0:\n\t"
    "pfd 2, 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, 64(%%r1,%[x])\n\t"
    "vl  %%v21, 80(%%r1,%[x])\n\t"
    "vl  %%v22, 96(%%r1,%[x])\n\t"
    "vl  %%v23, 112(%%r1,%[x])\n\t"
    "vl  %%v24, 128(%%r1,%[x])\n\t"
    "vl  %%v25, 144(%%r1,%[x])\n\t"
    "vl  %%v26, 160(%%r1,%[x])\n\t"
    "vl  %%v27, 176(%%r1,%[x])\n\t"
    "vl  %%v28, 192(%%r1,%[x])\n\t"
    "vl  %%v29, 208(%%r1,%[x])\n\t"
    "vl  %%v30, 224(%%r1,%[x])\n\t"
    "vl  %%v31, 240(%%r1,%[x])\n\t"
    "vl  %%v0, 0(%%r1,%[y])\n\t"
    "vl  %%v1, 16(%%r1,%[y])\n\t"
    "vl  %%v2, 32(%%r1,%[y])\n\t"
    "vl  %%v3, 48(%%r1,%[y])\n\t"
    "vl  %%v4, 64(%%r1,%[y])\n\t"
    "vl  %%v5, 80(%%r1,%[y])\n\t"
    "vl  %%v6, 96(%%r1,%[y])\n\t"
    "vl  %%v7, 112(%%r1,%[y])\n\t"
    "vst  %%v0, 0(%%r1,%[x])\n\t"
    "vst  %%v1, 16(%%r1,%[x])\n\t"
    "vst  %%v2, 32(%%r1,%[x])\n\t"
    "vst  %%v3, 48(%%r1,%[x])\n\t"
    "vst  %%v4, 64(%%r1,%[x])\n\t"
    "vst  %%v5, 80(%%r1,%[x])\n\t"
    "vst  %%v6, 96(%%r1,%[x])\n\t"
    "vst  %%v7, 112(%%r1,%[x])\n\t"
    "vl  %%v0, 128(%%r1,%[y])\n\t"
    "vl  %%v1, 144(%%r1,%[y])\n\t"
    "vl  %%v2, 160(%%r1,%[y])\n\t"
    "vl  %%v3, 176(%%r1,%[y])\n\t"
    "vl  %%v4, 192(%%r1,%[y])\n\t"
    "vl  %%v5, 208(%%r1,%[y])\n\t"
    "vl  %%v6, 224(%%r1,%[y])\n\t"
    "vl  %%v7, 240(%%r1,%[y])\n\t"
    "vst  %%v0, 128(%%r1,%[x])\n\t"
    "vst  %%v1, 144(%%r1,%[x])\n\t"
    "vst  %%v2, 160(%%r1,%[x])\n\t"
    "vst  %%v3, 176(%%r1,%[x])\n\t"
    "vst  %%v4, 192(%%r1,%[x])\n\t"
    "vst  %%v5, 208(%%r1,%[x])\n\t"
    "vst  %%v6, 224(%%r1,%[x])\n\t"
    "vst  %%v7, 240(%%r1,%[x])\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  %%v20, 64(%%r1,%[y])\n\t"
    "vst  %%v21, 80(%%r1,%[y])\n\t"
    "vst  %%v22, 96(%%r1,%[y])\n\t"
    "vst  %%v23, 112(%%r1,%[y])\n\t"
    "vst  %%v24, 128(%%r1,%[y])\n\t"
    "vst  %%v25, 144(%%r1,%[y])\n\t"
    "vst  %%v26, 160(%%r1,%[y])\n\t"
    "vst  %%v27, 176(%%r1,%[y])\n\t"
    "vst  %%v28, 192(%%r1,%[y])\n\t"
    "vst  %%v29, 208(%%r1,%[y])\n\t"
    "vst  %%v30, 224(%%r1,%[y])\n\t"
    "vst  %%v31, 240(%%r1,%[y])\n\t"
    "agfi   %%r1,256\n\t"
    "brctg  %[n],0b"
    : "+m"(*(FLOAT (*)[n * 2]) x),
       "+m"(*(FLOAT (*)[n * 2]) y),[n] "+&r"(n)
    : [x] "a"(x),[y] "a"(y)
    : "cc", "r1", "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "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 dummy3,
          FLOAT dummy4, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y,
          FLOAT *dummy, BLASLONG dummy2) {
  BLASLONG i = 0;
  BLASLONG ix = 0, iy = 0;
  FLOAT temp[2];
  BLASLONG inc_x2, inc_y2;

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

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

    BLASLONG n1 = n & -32;
    if (n1 > 0) {
      cswap_kernel_32(n1, x, y);
      i = n1;
      ix = 2 * n1;
      iy = 2 * n1;
    }

    while (i < n) {

      temp[0] = x[ix];
      temp[1] = x[ix + 1];
      x[ix] = y[iy];
      x[ix + 1] = y[iy + 1];
      y[iy] = temp[0];
      y[iy + 1] = temp[1];

      ix += 2;
      iy += 2;
      i++;

    }

  } else {

    inc_x2 = 2 * inc_x;
    inc_y2 = 2 * inc_y;

    while (i < n) {

      temp[0] = x[ix];
      temp[1] = x[ix + 1];
      x[ix] = y[iy];
      x[ix + 1] = y[iy + 1];
      y[iy] = temp[0];
      y[iy + 1] = temp[1];

      ix += inc_x2;
      iy += inc_y2;
      i++;

    }

  }
  return (0);

}
