OpenBLAS/kernel/zarch/dsdot.c

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#include "common.h"

static double dsdot_kernel_16(BLASLONG n, FLOAT *x, FLOAT *y) {
  double dot;

  __asm__("vzero %%v0\n\t"
    "vzero %%v1\n\t"
    "vzero %%v2\n\t"
    "vzero %%v3\n\t"
    "vzero %%v4\n\t"
    "vzero %%v5\n\t"
    "vzero %%v6\n\t"
    "vzero %%v7\n\t"
    "srlg  %[n],%[n],4\n\t"
    "xgr   %%r1,%%r1\n\t"
    "0:\n\t"
    "pfd 1,1024(%%r1,%[x])\n\t"
    "pfd 1,1024(%%r1,%[y])\n\t"
    "vlef  %%v16,0(%%r1,%[x]),0\n\t"
    "vlef  %%v16,4(%%r1,%[x]),2\n\t"
    "vlef  %%v17,8(%%r1,%[x]),0\n\t"
    "vlef  %%v17,12(%%r1,%[x]),2\n\t"
    "vlef  %%v18,16(%%r1,%[x]),0\n\t"
    "vlef  %%v18,20(%%r1,%[x]),2\n\t"
    "vlef  %%v19,24(%%r1,%[x]),0\n\t"
    "vlef  %%v19,28(%%r1,%[x]),2\n\t"
    "vlef  %%v20,32(%%r1,%[x]),0\n\t"
    "vlef  %%v20,36(%%r1,%[x]),2\n\t"
    "vlef  %%v21,40(%%r1,%[x]),0\n\t"
    "vlef  %%v21,44(%%r1,%[x]),2\n\t"
    "vlef  %%v22,48(%%r1,%[x]),0\n\t"
    "vlef  %%v22,52(%%r1,%[x]),2\n\t"
    "vlef  %%v23,56(%%r1,%[x]),0\n\t"
    "vlef  %%v23,60(%%r1,%[x]),2\n\t"
    "vflls   %%v16,%%v16\n\t"
    "vflls   %%v17,%%v17\n\t"
    "vflls   %%v18,%%v18\n\t"
    "vflls   %%v19,%%v19\n\t"
    "vflls   %%v20,%%v20\n\t"
    "vflls   %%v21,%%v21\n\t"
    "vflls   %%v22,%%v22\n\t"
    "vflls   %%v23,%%v23\n\t"
    "vlef    %%v24,0(%%r1,%[y]),0\n\t"
    "vlef    %%v24,4(%%r1,%[y]),2\n\t"
    "vflls   %%v24,%%v24\n\t"
    "vfmadb  %%v0,%%v16,%%v24,%%v0\n\t"
    "vlef    %%v25,8(%%r1,%[y]),0\n\t"
    "vlef    %%v25,12(%%r1,%[y]),2\n\t"
    "vflls   %%v25,%%v25\n\t"
    "vfmadb  %%v1,%%v17,%%v25,%%v1\n\t"
    "vlef    %%v26,16(%%r1,%[y]),0\n\t"
    "vlef    %%v26,20(%%r1,%[y]),2\n\t"
    "vflls   %%v26,%%v26\n\t"
    "vfmadb  %%v2,%%v18,%%v26,%%v2\n\t"
    "vlef    %%v27,24(%%r1,%[y]),0\n\t"
    "vlef    %%v27,28(%%r1,%[y]),2\n\t"
    "vflls   %%v27,%%v27\n\t"
    "vfmadb  %%v3,%%v19,%%v27,%%v3\n\t"
    "vlef    %%v28,32(%%r1,%[y]),0\n\t"
    "vlef    %%v28,36(%%r1,%[y]),2\n\t"
    "vflls   %%v28,%%v28\n\t"
    "vfmadb  %%v4,%%v20,%%v28,%%v4\n\t"
    "vlef    %%v29,40(%%r1,%[y]),0\n\t"
    "vlef    %%v29,44(%%r1,%[y]),2\n\t"
    "vflls   %%v29,%%v29\n\t"
    "vfmadb  %%v5,%%v21,%%v29,%%v5\n\t"
    "vlef    %%v30,48(%%r1,%[y]),0\n\t"
    "vlef    %%v30,52(%%r1,%[y]),2\n\t"
    "vflls   %%v30,%%v30\n\t"
    "vfmadb  %%v6,%%v22,%%v30,%%v6\n\t"
    "vlef    %%v31,56(%%r1,%[y]),0\n\t"
    "vlef    %%v31,60(%%r1,%[y]),2\n\t"
    "vflls   %%v31,%%v31\n\t"
    "vfmadb  %%v7,%%v23,%%v31,%%v7\n\t"
    "agfi   %%r1,64\n\t"
    "brctg  %[n],0b\n\t"
    "vfadb  %%v0,%%v0,%%v1\n\t"
    "vfadb  %%v0,%%v0,%%v2\n\t"
    "vfadb  %%v0,%%v0,%%v3\n\t"
    "vfadb  %%v0,%%v0,%%v4\n\t"
    "vfadb  %%v0,%%v0,%%v5\n\t"
    "vfadb  %%v0,%%v0,%%v6\n\t"
    "vfadb  %%v0,%%v0,%%v7\n\t"
    "vrepg  %%v1,%%v0,1\n\t"
    "adbr   %%f0,%%f1\n\t"
    "ldr    %[dot],%%f0"
    : [dot] "=f"(dot),[n] "+&r"(n)
    : "m"(*(const FLOAT (*)[n]) x),[x] "a"(x),
       "m"(*(const FLOAT (*)[n]) y),[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");

  return dot;
}

double CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y) {
  BLASLONG i = 0;
  BLASLONG ix = 0, iy = 0;

  double dot = 0.0;

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

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

    BLASLONG n1 = n & -16;

    if (n1)
      dot = dsdot_kernel_16(n1, x, y);

    i = n1;
    while (i < n) {

      dot += (double) y[i] * (double) x[i];
      i++;

    }
    return (dot);

  }

  BLASLONG n1 = n & -2;

  while (i < n1) {

    dot += (double) y[iy] * (double) x[ix];
    dot += (double) y[iy + inc_y] * (double) x[ix + inc_x];
    ix += inc_x * 2;
    iy += inc_y * 2;
    i += 2;

  }

  while (i < n) {

    dot += (double) y[iy] * (double) x[ix];
    ix += inc_x;
    iy += inc_y;
    i++;

  }
  return (dot);

}