242 lines
8.3 KiB
C
242 lines
8.3 KiB
C
/***************************************************************************
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Copyright (c) 2013-2017, 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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#if defined(DOUBLE)
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#define ABS fabs
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#else
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#define ABS fabsf
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#endif
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#define CABS1(x,i) (ABS(x[i]) + ABS(x[i + 1]))
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static FLOAT camax_kernel_32(BLASLONG n, FLOAT *x)
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{
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FLOAT amax;
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__asm__ volatile (
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"vlef %%v0,0(%2),0 \n\t"
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"vlef %%v16,4(%2),0 \n\t"
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"vlef %%v0,8(%2),1 \n\t"
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"vlef %%v16,12(%2),1 \n\t"
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"vlef %%v0,16(%2),2 \n\t"
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"vlef %%v16,20(%2),2 \n\t"
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"vlef %%v0,24(%2),3 \n\t"
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"vlef %%v16,28(%2),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 %%r0,%1,5 \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,%2) \n\t"
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"vl %%v16,0(%%r1,%2) \n\t"
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"vl %%v2,16(%%r1,%2) \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,%2) \n\t"
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"vl %%v2,48(%%r1,%2) \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,%2) \n\t"
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"vl %%v2,80(%%r1,%2) \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,%2) \n\t"
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"vl %%v2,112(%%r1,%2) \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,%2) \n\t"
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"vl %%v2,144(%%r1,%2) \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,%2) \n\t"
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"vl %%v2,176(%%r1,%2) \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,%2) \n\t"
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"vl %%v2,208(%%r1,%2) \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,%2) \n\t"
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"vl %%v2,240(%%r1,%2) \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 %%r0, 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 %0,%%f0 "
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:"=f"(amax)
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:"r"(n),"ZR"((const FLOAT (*)[n])x)
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:"memory","cc","r0","r1","v0","v1","v2","v16","v17","v18","v19","v20","v21","v22","v23","v24","v25","v26","v27","v28","v29","v30","v31"
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);
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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) 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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}
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else
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{
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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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