216 lines
6.4 KiB
C
216 lines
6.4 KiB
C
/***************************************************************************
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Copyright (c) 2013-2019, The OpenBLAS Project
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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3. Neither the name of the OpenBLAS project nor the names of
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its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*****************************************************************************/
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#include "common.h"
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#include <math.h>
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#define CABS1(x,i) (fabsf(x[i]) + fabsf(x[i + 1]))
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static FLOAT camax_kernel_32(BLASLONG n, FLOAT *x) {
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FLOAT amax;
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__asm__("vlef %%v0,0(%[x]),0\n\t"
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"vlef %%v16,4(%[x]),0\n\t"
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"vlef %%v0,8(%[x]),1\n\t"
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"vlef %%v16,12(%[x]),1\n\t"
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"vlef %%v0,16(%[x]),2\n\t"
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"vlef %%v16,20(%[x]),2\n\t"
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"vlef %%v0,24(%[x]),3\n\t"
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"vlef %%v16,28(%[x]),3\n\t"
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"vflpsb %%v0,%%v0\n\t"
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"vflpsb %%v16,%%v16\n\t"
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"vfasb %%v0,%%v0,%%v16\n\t"
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"vleib %%v1,0,0\n\t"
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"vleib %%v1,1,1\n\t"
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"vleib %%v1,2,2\n\t"
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"vleib %%v1,3,3\n\t"
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"vleib %%v1,8,4\n\t"
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"vleib %%v1,9,5\n\t"
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"vleib %%v1,10,6\n\t"
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"vleib %%v1,11,7\n\t"
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"vleib %%v1,16,8\n\t"
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"vleib %%v1,17,9\n\t"
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"vleib %%v1,18,10\n\t"
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"vleib %%v1,19,11\n\t"
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"vleib %%v1,24,12\n\t"
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"vleib %%v1,25,13\n\t"
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"vleib %%v1,26,14\n\t"
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"vleib %%v1,27,15\n\t"
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"srlg %[n],%[n],5\n\t"
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"xgr %%r1,%%r1\n\t"
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"0:\n\t"
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"pfd 1, 1024(%%r1,%[x])\n\t"
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"vl %%v16,0(%%r1,%[x])\n\t"
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"vl %%v2,16(%%r1,%[x])\n\t"
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"vpkg %%v17,%%v16,%%v2\n\t"
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"vperm %%v16,%%v16,%%v2,%%v1\n\t"
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"vl %%v18,32(%%r1,%[x])\n\t"
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"vl %%v2,48(%%r1,%[x])\n\t"
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"vpkg %%v19,%%v18,%%v2\n\t"
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"vperm %%v18,%%v18,%%v2,%%v1\n\t"
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"vl %%v20,64(%%r1,%[x])\n\t"
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"vl %%v2,80(%%r1,%[x])\n\t"
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"vpkg %%v21,%%v20,%%v2\n\t"
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"vperm %%v20,%%v20,%%v2,%%v1\n\t"
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"vl %%v22,96(%%r1,%[x])\n\t"
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"vl %%v2,112(%%r1,%[x])\n\t"
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"vpkg %%v23,%%v22,%%v2\n\t"
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"vperm %%v22,%%v22,%%v2,%%v1\n\t"
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"vl %%v24,128(%%r1,%[x])\n\t"
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"vl %%v2,144(%%r1,%[x])\n\t"
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"vpkg %%v25,%%v24,%%v2\n\t"
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"vperm %%v24,%%v24,%%v2,%%v1\n\t"
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"vl %%v26,160(%%r1,%[x])\n\t"
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"vl %%v2,176(%%r1,%[x])\n\t"
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"vpkg %%v27,%%v26,%%v2\n\t"
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"vperm %%v26,%%v26,%%v2,%%v1\n\t"
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"vl %%v28,192(%%r1,%[x])\n\t"
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"vl %%v2,208(%%r1,%[x])\n\t"
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"vpkg %%v29,%%v28,%%v2\n\t"
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"vperm %%v28,%%v28,%%v2,%%v1\n\t"
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"vl %%v30,224(%%r1,%[x])\n\t"
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"vl %%v2,240(%%r1,%[x])\n\t"
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"vpkg %%v31,%%v30,%%v2\n\t"
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"vperm %%v30,%%v30,%%v2,%%v1\n\t"
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"vflpsb %%v16,%%v16\n\t"
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"vflpsb %%v17,%%v17\n\t"
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"vflpsb %%v18,%%v18\n\t"
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"vflpsb %%v19,%%v19\n\t"
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"vflpsb %%v20,%%v20\n\t"
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"vflpsb %%v21,%%v21\n\t"
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"vflpsb %%v22,%%v22\n\t"
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"vflpsb %%v23,%%v23\n\t"
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"vflpsb %%v24,%%v24\n\t"
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"vflpsb %%v25,%%v25\n\t"
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"vflpsb %%v26,%%v26\n\t"
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"vflpsb %%v27,%%v27\n\t"
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"vflpsb %%v28,%%v28\n\t"
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"vflpsb %%v29,%%v29\n\t"
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"vflpsb %%v30,%%v30\n\t"
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"vflpsb %%v31,%%v31\n\t"
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"vfasb %%v16,%%v16,%%v17\n\t"
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"vfasb %%v18,%%v18,%%v19\n\t"
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"vfasb %%v20,%%v20,%%v21\n\t"
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"vfasb %%v22,%%v22,%%v23\n\t"
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"vfasb %%v24,%%v24,%%v25\n\t"
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"vfasb %%v26,%%v26,%%v27\n\t"
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"vfasb %%v28,%%v28,%%v29\n\t"
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"vfasb %%v30,%%v30,%%v31\n\t"
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"vfmaxsb %%v16,%%v16,%%v24,0\n\t"
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"vfmaxsb %%v18,%%v18,%%v26,0\n\t"
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"vfmaxsb %%v20,%%v20,%%v28,0\n\t"
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"vfmaxsb %%v22,%%v22,%%v30,0\n\t"
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"vfmaxsb %%v16,%%v16,%%v20,0\n\t"
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"vfmaxsb %%v18,%%v18,%%v22,0\n\t"
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"vfmaxsb %%v16,%%v16,%%v18,0\n\t"
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"vfmaxsb %%v0,%%v0,%%v16,0\n\t"
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"agfi %%r1, 256\n\t"
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"brctg %[n], 0b\n\t"
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"veslg %%v16,%%v0,32\n\t"
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"vfmaxsb %%v0,%%v0,%%v16,0\n\t"
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"vrepf %%v16,%%v0,2\n\t"
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"wfmaxsb %%v0,%%v0,%%v16,0\n\t"
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"ler %[amax],%%f0"
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: [amax] "=f"(amax),[n] "+&r"(n)
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: "m"(*(const FLOAT (*)[n * 2]) x),[x] "a"(x)
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: "cc", "r1", "v0", "v1", "v2", "v16", "v17", "v18", "v19", "v20",
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"v21", "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", "v30",
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"v31");
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return amax;
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}
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FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x) {
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BLASLONG i = 0;
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BLASLONG ix = 0;
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FLOAT maxf = 0.0;
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BLASLONG inc_x2;
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if (n <= 0 || inc_x <= 0)
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return (maxf);
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if (inc_x == 1) {
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BLASLONG n1 = n & -32;
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if (n1 > 0) {
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maxf = camax_kernel_32(n1, x);
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ix = n1 * 2;
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i = n1;
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} else {
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maxf = CABS1(x, 0);
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ix += 2;
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i++;
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}
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while (i < n) {
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if (CABS1(x, ix) > maxf) {
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maxf = CABS1(x, ix);
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}
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ix += 2;
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i++;
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}
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return (maxf);
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} else {
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maxf = CABS1(x, 0);
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inc_x2 = 2 * inc_x;
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BLASLONG n1 = n & -4;
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while (i < n1) {
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if (CABS1(x, ix) > maxf) {
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maxf = CABS1(x, ix);
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}
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if (CABS1(x, ix + inc_x2) > maxf) {
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maxf = CABS1(x, ix + inc_x2);
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}
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if (CABS1(x, ix + inc_x2 * 2) > maxf) {
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maxf = CABS1(x, ix + inc_x2 * 2);
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}
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if (CABS1(x, ix + inc_x2 * 3) > maxf) {
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maxf = CABS1(x, ix + inc_x2 * 3);
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}
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ix += inc_x2 * 4;
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i += 4;
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}
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while (i < n) {
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if (CABS1(x, ix) > maxf) {
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maxf = CABS1(x, ix);
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}
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ix += inc_x2;
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i++;
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}
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return (maxf);
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}
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}
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