zdot.c

/***************************************************************************
Copyright (c) 2013-2019, The OpenBLAS Project
All rights reserved.
Redistribution and use in source and binary forms, with or without
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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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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*****************************************************************************/

#include "common.h"

static void zdot_kernel_8(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *d) {
  __asm__("vzero %%v24\n\t"
    "vzero %%v25\n\t"
    "vzero %%v26\n\t"
    "vzero %%v27\n\t"
    "vzero %%v28\n\t"
    "vzero %%v29\n\t"
    "vzero %%v30\n\t"
    "vzero %%v31\n\t"
    "srlg %[n],%[n],3\n\t"
    "xgr %%r1,%%r1\n\t"
    "0:\n\t"
    "pfd 1, 1024(%%r1,%[x])\n\t"
    "pfd 1, 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  %%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"
    "vpdi %%v20,%%v16,%%v16,4\n\t"
    "vpdi %%v21,%%v17,%%v17,4\n\t"
    "vpdi %%v22,%%v18,%%v18,4\n\t"
    "vpdi %%v23,%%v19,%%v19,4\n\t"
    "vfmadb    %%v24,%%v16,%%v0,%%v24\n\t"
    "vfmadb    %%v25,%%v20,%%v0,%%v25\n\t"
    "vfmadb    %%v26,%%v17,%%v1,%%v26\n\t"
    "vfmadb    %%v27,%%v21,%%v1,%%v27\n\t"
    "vfmadb    %%v28,%%v18,%%v2,%%v28\n\t"
    "vfmadb    %%v29,%%v22,%%v2,%%v29\n\t"
    "vfmadb    %%v30,%%v19,%%v3,%%v30\n\t"
    "vfmadb    %%v31,%%v23,%%v3,%%v31\n\t"
    "vl  %%v16, 64(%%r1,%[x])\n\t"
    "vl  %%v17, 80(%%r1,%[x])\n\t"
    "vl  %%v18, 96(%%r1,%[x])\n\t"
    "vl  %%v19, 112(%%r1,%[x])\n\t"
    "vl  %%v0, 64(%%r1,%[y])\n\t"
    "vl  %%v1, 80(%%r1,%[y])\n\t"
    "vl  %%v2, 96(%%r1,%[y])\n\t"
    "vl  %%v3, 112(%%r1,%[y])\n\t"
    "vpdi %%v20,%%v16,%%v16,4\n\t"
    "vpdi %%v21,%%v17,%%v17,4\n\t"
    "vpdi %%v22,%%v18,%%v18,4\n\t"
    "vpdi %%v23,%%v19,%%v19,4\n\t"
    "vfmadb    %%v24,%%v16,%%v0,%%v24\n\t"
    "vfmadb    %%v25,%%v20,%%v0,%%v25\n\t"
    "vfmadb    %%v26,%%v17,%%v1,%%v26\n\t"
    "vfmadb    %%v27,%%v21,%%v1,%%v27\n\t"
    "vfmadb    %%v28,%%v18,%%v2,%%v28\n\t"
    "vfmadb    %%v29,%%v22,%%v2,%%v29\n\t"
    "vfmadb    %%v30,%%v19,%%v3,%%v30\n\t"
    "vfmadb    %%v31,%%v23,%%v3,%%v31\n\t"
    "agfi   %%r1,128\n\t"
    "brctg  %[n],0b\n\t"
    "vfadb  %%v24,%%v24,%%v26\n\t"
    "vfadb  %%v24,%%v24,%%v28\n\t"
    "vfadb  %%v24,%%v24,%%v30\n\t"
    "vfadb  %%v25,%%v25,%%v27\n\t"
    "vfadb  %%v25,%%v25,%%v29\n\t"
    "vfadb  %%v25,%%v25,%%v31\n\t"
    "vsteg  %%v24,0(%[d]),0\n\t"
    "vsteg  %%v24,8(%[d]),1\n\t"
    "vsteg  %%v25,16(%[d]),1\n\t"
    "vsteg  %%v25,24(%[d]),0"
    : "=m"(*(FLOAT (*)[4]) d),[n] "+&r"(n)
    : [d] "a"(d), "m"(*(const FLOAT (*)[n * 2]) x),[x] "a"(x),
       "m"(*(const FLOAT (*)[n * 2]) y),[y] "a"(y)
    : "cc", "r1", "v0", "v1", "v2", "v3", "v16", "v17", "v18", "v19", "v20",
       "v21", "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", "v30",
       "v31");
}

OPENBLAS_COMPLEX_FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y,
                             BLASLONG inc_y) {
  BLASLONG i;
  BLASLONG ix, iy;
  OPENBLAS_COMPLEX_FLOAT result;
  FLOAT dot[4] __attribute__ ((aligned(16))) = {
  0.0, 0.0, 0.0, 0.0};

  if (n <= 0) {
    CREAL(result) = 0.0;
    CIMAG(result) = 0.0;
    return (result);

  }

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

    BLASLONG n1 = n & -8;

    if (n1)
      zdot_kernel_8(n1, x, y, dot);

    i = n1;
    BLASLONG j = i * 2;

    while (i < n) {

      dot[0] += x[j] * y[j];
      dot[1] += x[j + 1] * y[j + 1];
      dot[2] += x[j] * y[j + 1];
      dot[3] += x[j + 1] * y[j];

      j += 2;
      i++;

    }

  } else {
    i = 0;
    ix = 0;
    iy = 0;
    inc_x <<= 1;
    inc_y <<= 1;
    while (i < n) {

      dot[0] += x[ix] * y[iy];
      dot[1] += x[ix + 1] * y[iy + 1];
      dot[2] += x[ix] * y[iy + 1];
      dot[3] += x[ix + 1] * y[iy];

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

    }
  }

#if !defined(CONJ)
  CREAL(result) = dot[0] - dot[1];
  CIMAG(result) = dot[2] + dot[3];
#else
  CREAL(result) = dot[0] + dot[1];
  CIMAG(result) = dot[2] - dot[3];

#endif

  return (result);

}