OpenBLAS/kernel/zarch/isamin.c

/***************************************************************************
Copyright (c) 2013-2019, The OpenBLAS Project
All rights reserved.
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modification, are permitted provided that the following conditions are
met:
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
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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*****************************************************************************/

#include "common.h"
#include <math.h>

#define ABS fabsf

static BLASLONG isamin_kernel_64(BLASLONG n, FLOAT *x, FLOAT *amin) {
  BLASLONG iamin;

  __asm__("vl     %%v0,0(%[x])\n\t"
    "vflpsb %%v0,%%v0\n\t"
    "vleig  %%v1,0,0\n\t"
    "vleig  %%v1,2,1\n\t"
    "vleig  %%v2,1,0\n\t"
    "vleig  %%v2,3,1\n\t"
    "vrepig %%v3,32\n\t"
    "vzero  %%v4\n\t"
    "vleif  %%v24,0,0\n\t"
    "vleif  %%v24,1,1\n\t"
    "vleif  %%v24,2,2\n\t"
    "vleif  %%v24,3,3\n\t"
    "vleif  %%v25,4,0\n\t"
    "vleif  %%v25,5,1\n\t"
    "vleif  %%v25,6,2\n\t"
    "vleif  %%v25,7,3\n\t"
    "vleif  %%v26,8,0\n\t"
    "vleif  %%v26,9,1\n\t"
    "vleif  %%v26,10,2\n\t"
    "vleif  %%v26,11,3\n\t"
    "vleif  %%v27,12,0\n\t"
    "vleif  %%v27,13,1\n\t"
    "vleif  %%v27,14,2\n\t"
    "vleif  %%v27,15,3\n\t"
    "vleif  %%v28,16,0\n\t"
    "vleif  %%v28,17,1\n\t"
    "vleif  %%v28,18,2\n\t"
    "vleif  %%v28,19,3\n\t"
    "vleif  %%v29,20,0\n\t"
    "vleif  %%v29,21,1\n\t"
    "vleif  %%v29,22,2\n\t"
    "vleif  %%v29,23,3\n\t"
    "vleif  %%v30,24,0\n\t"
    "vleif  %%v30,25,1\n\t"
    "vleif  %%v30,26,2\n\t"
    "vleif  %%v30,27,3\n\t"
    "vleif  %%v31,28,0\n\t"
    "vleif  %%v31,29,1\n\t"
    "vleif  %%v31,30,2\n\t"
    "vleif  %%v31,31,3\n\t"
    "srlg  %[n],%[n],6\n\t"
    "xgr %%r1,%%r1\n\t"
    "0:\n\t"
    "pfd 1, 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"
    "vflpsb  %%v16, %%v16\n\t"
    "vflpsb  %%v17, %%v17\n\t"
    "vflpsb  %%v18, %%v18\n\t"
    "vflpsb  %%v19, %%v19\n\t"
    "vflpsb  %%v20, %%v20\n\t"
    "vflpsb  %%v21, %%v21\n\t"
    "vflpsb  %%v22, %%v22\n\t"
    "vflpsb  %%v23, %%v23\n\t"
    "vfchesb  %%v5,%%v17,%%v16\n\t"
    "vfchesb  %%v6,%%v19,%%v18\n\t"
    "vfchesb  %%v7,%%v21,%%v20\n\t"
    "vfchesb  %%v8,%%v23,%%v22\n\t"
    "vsel    %%v16,%%v16,%%v17,%%v5\n\t"
    "vsel    %%v5,%%v24,%%v25,%%v5\n\t"
    "vsel    %%v17,%%v18,%%v19,%%v6\n\t"
    "vsel    %%v6,%%v26,%%v27,%%v6\n\t"
    "vsel    %%v18,%%v20,%%v21,%%v7\n\t"
    "vsel    %%v7,%%v28,%%v29,%%v7\n\t"
    "vsel    %%v19,%%v22,%%v23,%%v8\n\t"
    "vsel    %%v8,%%v30,%%v31,%%v8\n\t"
    "vfchesb  %%v20,%%v17,%%v16\n\t"
    "vfchesb  %%v21,%%v19,%%v18\n\t"
    "vsel    %%v16,%%v16,%%v17,%%v20\n\t"
    "vsel    %%v5,%%v5,%%v6,%%v20\n\t"
    "vsel    %%v17,%%v18,%%v19,%%v21\n\t"
    "vsel    %%v6,%%v7,%%v8,%%v21\n\t"
    "vfchesb  %%v18,%%v17,%%v16\n\t"
    "vsel    %%v16,%%v16,%%v17,%%v18\n\t"
    "vsel    %%v5,%%v5,%%v6,%%v18\n\t"
    "vsegf   %%v6,%%v5\n\t"
    "vesrlg  %%v5,%%v5,32\n\t"
    "vag     %%v5,%%v5,%%v4\n\t"
    "vag     %%v6,%%v6,%%v4\n\t"
    "vfchesb  %%v7,%%v16,%%v0\n\t"
    "vsel    %%v0,%%v0,%%v16,%%v7\n\t"
    "vsegf   %%v8,%%v7\n\t"
    "vesrlg  %%v7,%%v7,32\n\t"
    "vsegf   %%v7,%%v7\n\t"
    "vsel    %%v1,%%v1,%%v5,%%v7\n\t"
    "vsel    %%v2,%%v2,%%v6,%%v8\n\t"
    "vag     %%v4,%%v4,%%v3\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  %%v20,192(%%r1,%[x])\n\t"
    "vl  %%v21,208(%%r1,%[x])\n\t"
    "vl  %%v22,224(%%r1,%[x])\n\t"
    "vl  %%v23,240(%%r1,%[x])\n\t"
    "vflpsb  %%v16, %%v16\n\t"
    "vflpsb  %%v17, %%v17\n\t"
    "vflpsb  %%v18, %%v18\n\t"
    "vflpsb  %%v19, %%v19\n\t"
    "vflpsb  %%v20, %%v20\n\t"
    "vflpsb  %%v21, %%v21\n\t"
    "vflpsb  %%v22, %%v22\n\t"
    "vflpsb  %%v23, %%v23\n\t"
    "vfchesb  %%v5,%%v17,%%v16\n\t"
    "vfchesb  %%v6,%%v19,%%v18\n\t"
    "vfchesb  %%v7,%%v21,%%v20\n\t"
    "vfchesb  %%v8,%%v23,%%v22\n\t"
    "vsel    %%v16,%%v16,%%v17,%%v5\n\t"
    "vsel    %%v5,%%v24,%%v25,%%v5\n\t"
    "vsel    %%v17,%%v18,%%v19,%%v6\n\t"
    "vsel    %%v6,%%v26,%%v27,%%v6\n\t"
    "vsel    %%v18,%%v20,%%v21,%%v7\n\t"
    "vsel    %%v7,%%v28,%%v29,%%v7\n\t"
    "vsel    %%v19,%%v22,%%v23,%%v8\n\t"
    "vsel    %%v8,%%v30,%%v31,%%v8\n\t"
    "vfchesb  %%v20,%%v17,%%v16\n\t"
    "vfchesb  %%v21,%%v19,%%v18\n\t"
    "vsel    %%v16,%%v16,%%v17,%%v20\n\t"
    "vsel    %%v5,%%v5,%%v6,%%v20\n\t"
    "vsel    %%v17,%%v18,%%v19,%%v21\n\t"
    "vsel    %%v6,%%v7,%%v8,%%v21\n\t"
    "vfchesb  %%v18,%%v17,%%v16\n\t"
    "vsel    %%v16,%%v16,%%v17,%%v18\n\t"
    "vsel    %%v5,%%v5,%%v6,%%v18\n\t"
    "vsegf   %%v6,%%v5\n\t"
    "vesrlg  %%v5,%%v5,32\n\t"
    "vag     %%v5,%%v5,%%v4\n\t"
    "vag     %%v6,%%v6,%%v4\n\t"
    "vfchesb  %%v7,%%v16,%%v0\n\t"
    "vsel    %%v0,%%v0,%%v16,%%v7\n\t"
    "vsegf   %%v8,%%v7\n\t"
    "vesrlg  %%v7,%%v7,32\n\t"
    "vsegf   %%v7,%%v7\n\t"
    "vsel    %%v1,%%v1,%%v5,%%v7\n\t"
    "vsel    %%v2,%%v2,%%v6,%%v8\n\t"
    "vag     %%v4,%%v4,%%v3\n\t"
    "agfi    %%r1, 256\n\t"
    "brctg   %[n], 0b\n\t"
    "veslg   %%v3,%%v0,32\n\t"
    "vfchsb  %%v4,%%v3,%%v0\n\t"
    "vchlg   %%v5,%%v2,%%v1\n\t"
    "vfcesb  %%v6,%%v0,%%v3\n\t"
    "vn      %%v5,%%v5,%%v6\n\t"
    "vo      %%v4,%%v4,%%v5\n\t"
    "vsel    %%v0,%%v0,%%v3,%%v4\n\t"
    "vesrlg  %%v4,%%v4,32\n\t"
    "vsegf   %%v4,%%v4\n\t"
    "vsel    %%v1,%%v1,%%v2,%%v4\n\t"
    "vrepf  %%v2,%%v0,2\n\t"
    "vrepg  %%v3,%%v1,1\n\t"
    "wfcsb  %%v2,%%v0\n\t"
    "jne 1f\n\t"
    "vstef  %%v0,%[amin],0\n\t"
    "vmnlg  %%v0,%%v1,%%v3\n\t"
    "vlgvg  %[iamin],%%v0,0\n\t"
    "j 2f\n\t"
    "1:\n\t"
    "wfchsb %%v4,%%v0,%%v2\n\t"
    "vesrlg %%v4,%%v4,32\n\t"
    "vsegf  %%v4,%%v4\n\t"
    "vsel   %%v1,%%v3,%%v1,%%v4\n\t"
    "vsel   %%v0,%%v2,%%v0,%%v4\n\t"
    "ste    %%f0,%[amin]\n\t"
    "vlgvg  %[iamin],%%v1,0\n\t"
    "2:\n\t"
    "nop 0"
    : [iamin] "=r"(iamin),[amin] "=Q"(*amin),[n] "+&r"(n)
    : "m"(*(const FLOAT (*)[n]) x),[x] "a"(x)
    : "cc", "r1", "v0", "v1", "v2", "v4", "v5", "v6", "v7", "v8", "v16",
       "v17", "v18", "v19", "v20", "v21", "v22", "v23", "v24", "v25", "v26",
       "v27", "v28", "v29", "v30", "v31");

  return iamin;
}

BLASLONG CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x) {
  BLASLONG i = 0;
  BLASLONG j = 0;
  FLOAT minf = 0.0;
  BLASLONG min = 0;

  if (n <= 0 || inc_x <= 0)
    return (min);

  if (inc_x == 1) {

    BLASLONG n1 = n & -64;
    if (n1 > 0) {

      min = isamin_kernel_64(n1, x, &minf);

      i = n1;
    } else {
      minf = ABS(x[0]);
      i++;
    }

    while (i < n) {
      if (ABS(x[i]) < minf) {
        min = i;
        minf = ABS(x[i]);
      }
      i++;
    }
    return (min + 1);

  } else {

    min = 0;
    minf = ABS(x[0]);

    BLASLONG n1 = n & -4;
    while (j < n1) {

      if (ABS(x[i]) < minf) {
        min = j;
        minf = ABS(x[i]);
      }
      if (ABS(x[i + inc_x]) < minf) {
        min = j + 1;
        minf = ABS(x[i + inc_x]);
      }
      if (ABS(x[i + 2 * inc_x]) < minf) {
        min = j + 2;
        minf = ABS(x[i + 2 * inc_x]);
      }
      if (ABS(x[i + 3 * inc_x]) < minf) {
        min = j + 3;
        minf = ABS(x[i + 3 * inc_x]);
      }

      i += inc_x * 4;

      j += 4;

    }

    while (j < n) {
      if (ABS(x[i]) < minf) {
        min = j;
        minf = ABS(x[i]);
      }
      i += inc_x;
      j++;
    }
    return (min + 1);
  }
}