OpenBLAS/kernel/zarch/zscal.c

/***************************************************************************
Copyright (c) 2013-2019, The OpenBLAS Project
All rights reserved.
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modification, are permitted provided that the following conditions are
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1. Redistributions of source code must retain the above copyright
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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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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/

#include "common.h"

static void zscal_kernel_8(BLASLONG n, FLOAT *alpha, FLOAT *x) {
  __asm__("vlrepg %%v0,0(%[alpha])\n\t"
    "vleg   %%v1,8(%[alpha]),0\n\t"
    "wflcdb %%v1,%%v1\n\t"
    "vleg   %%v1,8(%[alpha]),1\n\t"
    "srlg %[n],%[n],3\n\t"
    "xgr   %%r1,%%r1\n\t"
    "0:\n\t"
    "pfd 2, 1024(%%r1,%[x])\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"
    "vpdi %%v24,%%v16,%%v16,4\n\t"
    "vpdi %%v25,%%v17,%%v17,4\n\t"
    "vpdi %%v26,%%v18,%%v18,4\n\t"
    "vpdi %%v27,%%v19,%%v19,4\n\t"
    "vpdi %%v28,%%v20,%%v20,4\n\t"
    "vpdi %%v29,%%v21,%%v21,4\n\t"
    "vpdi %%v30,%%v22,%%v22,4\n\t"
    "vpdi %%v31,%%v23,%%v23,4\n\t"
    "vfmdb %%v16,%%v16,%%v0\n\t"
    "vfmdb %%v17,%%v17,%%v0\n\t"
    "vfmdb %%v18,%%v18,%%v0\n\t"
    "vfmdb %%v19,%%v19,%%v0\n\t"
    "vfmdb %%v20,%%v20,%%v0\n\t"
    "vfmdb %%v21,%%v21,%%v0\n\t"
    "vfmdb %%v22,%%v22,%%v0\n\t"
    "vfmdb %%v23,%%v23,%%v0\n\t"
    "vfmadb %%v16,%%v24,%%v1,%%v16\n\t"
    "vfmadb %%v17,%%v25,%%v1,%%v17\n\t"
    "vfmadb %%v18,%%v26,%%v1,%%v18\n\t"
    "vfmadb %%v19,%%v27,%%v1,%%v19\n\t"
    "vfmadb %%v20,%%v28,%%v1,%%v20\n\t"
    "vfmadb %%v21,%%v29,%%v1,%%v21\n\t"
    "vfmadb %%v22,%%v30,%%v1,%%v22\n\t"
    "vfmadb %%v23,%%v31,%%v1,%%v23\n\t"
    "vst %%v16,0(%%r1,%[x])\n\t"
    "vst %%v17,16(%%r1,%[x])\n\t"
    "vst %%v18,32(%%r1,%[x])\n\t"
    "vst %%v19,48(%%r1,%[x])\n\t"
    "vst %%v20,64(%%r1,%[x])\n\t"
    "vst %%v21,80(%%r1,%[x])\n\t"
    "vst %%v22,96(%%r1,%[x])\n\t"
    "vst %%v23,112(%%r1,%[x])\n\t"
    "agfi  %%r1,128\n\t"
    "brctg %[n],0b"
    : "+m"(*(struct { FLOAT x[n * 2]; } *) x),[n] "+&r"(n)
    : [x] "a"(x), "m"(*(const struct { FLOAT x[2]; } *) alpha),
       [alpha] "a"(alpha)
    : "cc", "r1", "v0", "v1", "v16", "v17", "v18", "v19", "v20", "v21",
       "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", "v30",
       "v31");
}

static void zscal_kernel_8_zero_r(BLASLONG n, FLOAT *alpha, FLOAT *x) {
  __asm__("vleg   %%v0,8(%[alpha]),0\n\t"
    "wflcdb %%v0,%%v0\n\t"
    "vleg   %%v0,8(%[alpha]),1\n\t"
    "srlg %[n],%[n],3\n\t"
    "xgr   %%r1,%%r1\n\t"
    "0:\n\t"
    "pfd 2, 1024(%%r1,%[x])\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"
    "vpdi %%v16,%%v16,%%v16,4\n\t"
    "vpdi %%v17,%%v17,%%v17,4\n\t"
    "vpdi %%v18,%%v18,%%v18,4\n\t"
    "vpdi %%v19,%%v19,%%v19,4\n\t"
    "vpdi %%v20,%%v20,%%v20,4\n\t"
    "vpdi %%v21,%%v21,%%v21,4\n\t"
    "vpdi %%v22,%%v22,%%v22,4\n\t"
    "vpdi %%v23,%%v23,%%v23,4\n\t"
    "vfmdb %%v16,%%v16,%%v0\n\t"
    "vfmdb %%v17,%%v17,%%v0\n\t"
    "vfmdb %%v18,%%v18,%%v0\n\t"
    "vfmdb %%v19,%%v19,%%v0\n\t"
    "vfmdb %%v20,%%v20,%%v0\n\t"
    "vfmdb %%v21,%%v21,%%v0\n\t"
    "vfmdb %%v22,%%v22,%%v0\n\t"
    "vfmdb %%v23,%%v23,%%v0\n\t"
    "vst %%v16,0(%%r1,%[x])\n\t"
    "vst %%v17,16(%%r1,%[x])\n\t"
    "vst %%v18,32(%%r1,%[x])\n\t"
    "vst %%v19,48(%%r1,%[x])\n\t"
    "vst %%v20,64(%%r1,%[x])\n\t"
    "vst %%v21,80(%%r1,%[x])\n\t"
    "vst %%v22,96(%%r1,%[x])\n\t"
    "vst %%v23,112(%%r1,%[x])\n\t"
    "agfi  %%r1,128\n\t"
    "brctg %[n],0b"
    : "+m"(*(struct { FLOAT x[n * 2]; } *) x),[n] "+&r"(n)
    : [x] "a"(x), "m"(*(const struct { FLOAT x[2]; } *) alpha),
       [alpha] "a"(alpha)
    : "cc", "r1", "v0", "v16", "v17", "v18", "v19", "v20", "v21", "v22",
       "v23");
}

static void zscal_kernel_8_zero_i(BLASLONG n, FLOAT *alpha, FLOAT *x) {
  __asm__("vlrepg %%v0,0(%[alpha])\n\t"
    "srlg %[n],%[n],3\n\t"
    "xgr   %%r1,%%r1\n\t"
    "0:\n\t"
    "pfd 2, 1024(%%r1,%[x])\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"
    "vfmdb %%v16,%%v16,%%v0\n\t"
    "vfmdb %%v17,%%v17,%%v0\n\t"
    "vfmdb %%v18,%%v18,%%v0\n\t"
    "vfmdb %%v19,%%v19,%%v0\n\t"
    "vfmdb %%v20,%%v20,%%v0\n\t"
    "vfmdb %%v21,%%v21,%%v0\n\t"
    "vfmdb %%v22,%%v22,%%v0\n\t"
    "vfmdb %%v23,%%v23,%%v0\n\t"
    "vst %%v16,0(%%r1,%[x])\n\t"
    "vst %%v17,16(%%r1,%[x])\n\t"
    "vst %%v18,32(%%r1,%[x])\n\t"
    "vst %%v19,48(%%r1,%[x])\n\t"
    "vst %%v20,64(%%r1,%[x])\n\t"
    "vst %%v21,80(%%r1,%[x])\n\t"
    "vst %%v22,96(%%r1,%[x])\n\t"
    "vst %%v23,112(%%r1,%[x])\n\t"
    "agfi  %%r1,128\n\t"
    "brctg %[n],0b"
    : "+m"(*(struct { FLOAT x[n * 2]; } *) x),[n] "+&r"(n)
    : [x] "a"(x), "m"(*(const struct { FLOAT x[2]; } *) alpha),
       [alpha] "a"(alpha)
    : "cc", "r1", "v0", "v16", "v17", "v18", "v19", "v20", "v21", "v22",
       "v23");
}

static void zscal_kernel_8_zero(BLASLONG n, FLOAT *x) {
  __asm__("vzero %%v0\n\t"
    "srlg %[n],%[n],3\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"(*(struct { FLOAT x[n * 2]; } *) x),[n] "+&r"(n)
    : [x] "a"(x)
    : "cc", "r1", "v0");
}

static void zscal_kernel_inc_8(BLASLONG n, FLOAT *alpha, FLOAT *x,
                               BLASLONG inc_x) {
  BLASLONG i;
  BLASLONG inc_x2 = 2 * inc_x;
  BLASLONG inc_x3 = inc_x2 + inc_x;
  FLOAT t0, t1, t2, t3;
  FLOAT da_r = alpha[0];
  FLOAT da_i = alpha[1];

  for (i = 0; i < n; i += 4) {
    t0 = da_r * x[0] - da_i * x[1];
    t1 = da_r * x[inc_x] - da_i * x[inc_x + 1];
    t2 = da_r * x[inc_x2] - da_i * x[inc_x2 + 1];
    t3 = da_r * x[inc_x3] - da_i * x[inc_x3 + 1];

    x[1] = da_i * x[0] + da_r * x[1];
    x[inc_x + 1] = da_i * x[inc_x] + da_r * x[inc_x + 1];
    x[inc_x2 + 1] = da_i * x[inc_x2] + da_r * x[inc_x2 + 1];
    x[inc_x3 + 1] = da_i * x[inc_x3] + da_r * x[inc_x3 + 1];

    x[0] = t0;
    x[inc_x] = t1;
    x[inc_x2] = t2;
    x[inc_x3] = t3;

    x += 4 * inc_x;
  }
}

int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT da_r, FLOAT da_i,
          FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *dummy,
          BLASLONG dummy2) {
  BLASLONG i = 0, j = 0;
  FLOAT temp0;
  FLOAT temp1;
  FLOAT alpha[2] __attribute__ ((aligned(16)));

  if (inc_x != 1) {
    inc_x <<= 1;

    if (da_r == 0.0) {

      BLASLONG n1 = n & -2;

      if (da_i == 0.0) {

        while (j < n1) {

          x[i] = 0.0;
          x[i + 1] = 0.0;
          x[i + inc_x] = 0.0;
          x[i + 1 + inc_x] = 0.0;
          i += 2 * inc_x;
          j += 2;

        }

        while (j < n) {

          x[i] = 0.0;
          x[i + 1] = 0.0;
          i += inc_x;
          j++;

        }

      } else {

        while (j < n1) {

          temp0 = -da_i * x[i + 1];
          x[i + 1] = da_i * x[i];
          x[i] = temp0;
          temp1 = -da_i * x[i + 1 + inc_x];
          x[i + 1 + inc_x] = da_i * x[i + inc_x];
          x[i + inc_x] = temp1;
          i += 2 * inc_x;
          j += 2;

        }

        while (j < n) {

          temp0 = -da_i * x[i + 1];
          x[i + 1] = da_i * x[i];
          x[i] = temp0;
          i += inc_x;
          j++;

        }

      }

    } else {

      if (da_i == 0.0) {
        BLASLONG n1 = n & -2;

        while (j < n1) {

          temp0 = da_r * x[i];
          x[i + 1] = da_r * x[i + 1];
          x[i] = temp0;
          temp1 = da_r * x[i + inc_x];
          x[i + 1 + inc_x] = da_r * x[i + 1 + inc_x];
          x[i + inc_x] = temp1;
          i += 2 * inc_x;
          j += 2;

        }

        while (j < n) {

          temp0 = da_r * x[i];
          x[i + 1] = da_r * x[i + 1];
          x[i] = temp0;
          i += inc_x;
          j++;

        }

      } else {

        BLASLONG n1 = n & -8;
        if (n1 > 0) {
          alpha[0] = da_r;
          alpha[1] = da_i;
          zscal_kernel_inc_8(n1, alpha, x, inc_x);
          j = n1;
          i = n1 * inc_x;
        }

        while (j < n) {

          temp0 = da_r * x[i] - da_i * x[i + 1];
          x[i + 1] = da_r * x[i + 1] + da_i * x[i];
          x[i] = temp0;
          i += inc_x;
          j++;

        }

      }

    }

    return (0);
  }

  BLASLONG n1 = n & -8;
  if (n1 > 0) {

    alpha[0] = da_r;
    alpha[1] = da_i;

    if (da_r == 0.0)
      if (da_i == 0)
        zscal_kernel_8_zero(n1, x);
      else
        zscal_kernel_8_zero_r(n1, alpha, x);
    else if (da_i == 0)
      zscal_kernel_8_zero_i(n1, alpha, x);
    else
      zscal_kernel_8(n1, alpha, x);

    i = n1 << 1;
    j = n1;
  }

  if (da_r == 0.0) {

    if (da_i == 0.0) {

      while (j < n) {

        x[i] = 0.0;
        x[i + 1] = 0.0;
        i += 2;
        j++;

      }

    } else {

      while (j < n) {

        temp0 = -da_i * x[i + 1];
        x[i + 1] = da_i * x[i];
        x[i] = temp0;
        i += 2;
        j++;

      }

    }

  } else {

    if (da_i == 0.0) {

      while (j < n) {

        temp0 = da_r * x[i];
        x[i + 1] = da_r * x[i + 1];
        x[i] = temp0;
        i += 2;
        j++;

      }

    } else {

      while (j < n) {

        temp0 = da_r * x[i] - da_i * x[i + 1];
        x[i + 1] = da_r * x[i + 1] + da_i * x[i];
        x[i] = temp0;
        i += 2;
        j++;

      }

    }

  }

  return (0);
}