246 lines
7.4 KiB
C
246 lines
7.4 KiB
C
/***************************************************************************
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Copyright (c) 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) (fabs(x[i]) + fabs(x[i + 1]))
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static BLASLONG izamin_kernel_16(BLASLONG n, FLOAT *x, FLOAT *amin) {
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BLASLONG iamin;
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__asm__("vleg %%v0,0(%[x]),0\n\t"
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"vleg %%v1,8(%[x]),0\n\t"
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"vleg %%v0,16(%[x]),1\n\t"
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"vleg %%v1,24(%[x]),1\n\t"
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"vflpdb %%v0,%%v0\n\t"
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"vflpdb %%v1,%%v1\n\t"
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"vfadb %%v0,%%v0,%%v1\n\t"
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"vleig %%v1,0,0\n\t"
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"vleig %%v1,1,1\n\t"
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"vrepig %%v2,8\n\t"
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"vzero %%v3\n\t"
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"vleig %%v24,0,0\n\t"
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"vleig %%v24,1,1\n\t"
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"vleig %%v25,2,0\n\t"
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"vleig %%v25,3,1\n\t"
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"vleig %%v26,4,0\n\t"
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"vleig %%v26,5,1\n\t"
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"vleig %%v27,6,0\n\t"
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"vleig %%v27,7,1\n\t"
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"srlg %[n],%[n],4\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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"vleg %%v16,0(%%r1,%[x]),0\n\t"
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"vleg %%v17,8(%%r1,%[x]),0\n\t"
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"vleg %%v16,16(%%r1,%[x]),1\n\t"
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"vleg %%v17,24(%%r1,%[x]),1\n\t"
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"vleg %%v18,32(%%r1,%[x]),0\n\t"
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"vleg %%v19,40(%%r1,%[x]),0\n\t"
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"vleg %%v18,48(%%r1,%[x]),1\n\t"
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"vleg %%v19,56(%%r1,%[x]),1\n\t"
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"vleg %%v20,64(%%r1,%[x]),0\n\t"
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"vleg %%v21,72(%%r1,%[x]),0\n\t"
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"vleg %%v20,80(%%r1,%[x]),1\n\t"
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"vleg %%v21,88(%%r1,%[x]),1\n\t"
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"vleg %%v22,96(%%r1,%[x]),0\n\t"
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"vleg %%v23,104(%%r1,%[x]),0\n\t"
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"vleg %%v22,112(%%r1,%[x]),1\n\t"
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"vleg %%v23,120(%%r1,%[x]),1\n\t"
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"vflpdb %%v16, %%v16\n\t"
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"vflpdb %%v17, %%v17\n\t"
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"vflpdb %%v18, %%v18\n\t"
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"vflpdb %%v19, %%v19\n\t"
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"vflpdb %%v20, %%v20\n\t"
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"vflpdb %%v21, %%v21\n\t"
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"vflpdb %%v22, %%v22\n\t"
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"vflpdb %%v23, %%v23\n\t"
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"vfadb %%v16,%%v16,%%v17\n\t"
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"vfadb %%v17,%%v18,%%v19\n\t"
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"vfadb %%v18,%%v20,%%v21\n\t"
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"vfadb %%v19,%%v22,%%v23\n\t"
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"vfchedb %%v4,%%v17,%%v16\n\t"
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"vfchedb %%v5,%%v19,%%v18\n\t"
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"vsel %%v16,%%v16,%%v17,%%v4\n\t"
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"vsel %%v4,%%v24,%%v25,%%v4\n\t"
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"vsel %%v17,%%v18,%%v19,%%v5\n\t"
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"vsel %%v5,%%v26,%%v27,%%v5\n\t"
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"vfchedb %%v18,%%v17,%%v16\n\t"
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"vsel %%v16,%%v16,%%v17,%%v18\n\t"
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"vsel %%v4,%%v4,%%v5,%%v18\n\t"
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"vag %%v4,%%v4,%%v3\n\t"
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"vfchedb %%v5,%%v16,%%v0\n\t"
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"vsel %%v0,%%v0,%%v16,%%v5\n\t"
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"vsel %%v1,%%v1,%%v4,%%v5\n\t"
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"vag %%v3,%%v3,%%v2\n\t"
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"vleg %%v16,128(%%r1,%[x]),0\n\t"
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"vleg %%v17,136(%%r1,%[x]),0\n\t"
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"vleg %%v16,144(%%r1,%[x]),1\n\t"
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"vleg %%v17,152(%%r1,%[x]),1\n\t"
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"vleg %%v18,160(%%r1,%[x]),0\n\t"
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"vleg %%v19,168(%%r1,%[x]),0\n\t"
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"vleg %%v18,176(%%r1,%[x]),1\n\t"
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"vleg %%v19,184(%%r1,%[x]),1\n\t"
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"vleg %%v20,192(%%r1,%[x]),0\n\t"
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"vleg %%v21,200(%%r1,%[x]),0\n\t"
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"vleg %%v20,208(%%r1,%[x]),1\n\t"
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"vleg %%v21,216(%%r1,%[x]),1\n\t"
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"vleg %%v22,224(%%r1,%[x]),0\n\t"
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"vleg %%v23,232(%%r1,%[x]),0\n\t"
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"vleg %%v22,240(%%r1,%[x]),1\n\t"
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"vleg %%v23,248(%%r1,%[x]),1\n\t"
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"vflpdb %%v16, %%v16\n\t"
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"vflpdb %%v17, %%v17\n\t"
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"vflpdb %%v18, %%v18\n\t"
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"vflpdb %%v19, %%v19\n\t"
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"vflpdb %%v20, %%v20\n\t"
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"vflpdb %%v21, %%v21\n\t"
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"vflpdb %%v22, %%v22\n\t"
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"vflpdb %%v23, %%v23\n\t"
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"vfadb %%v16,%%v16,%%v17\n\t"
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"vfadb %%v17,%%v18,%%v19\n\t"
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"vfadb %%v18,%%v20,%%v21\n\t"
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"vfadb %%v19,%%v22,%%v23\n\t"
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"vfchedb %%v4,%%v17,%%v16\n\t"
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"vfchedb %%v5,%%v19,%%v18\n\t"
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"vsel %%v16,%%v16,%%v17,%%v4\n\t"
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"vsel %%v4,%%v24,%%v25,%%v4\n\t"
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"vsel %%v17,%%v18,%%v19,%%v5\n\t"
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"vsel %%v5,%%v26,%%v27,%%v5\n\t"
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"vfchedb %%v18,%%v17,%%v16\n\t"
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"vsel %%v16,%%v16,%%v17,%%v18\n\t"
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"vsel %%v4,%%v4,%%v5,%%v18\n\t"
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"vag %%v4,%%v4,%%v3\n\t"
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"vfchedb %%v5,%%v16,%%v0\n\t"
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"vsel %%v0,%%v0,%%v16,%%v5\n\t"
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"vsel %%v1,%%v1,%%v4,%%v5\n\t"
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"vag %%v3,%%v3,%%v2\n\t"
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"agfi %%r1, 256\n\t"
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"brctg %[n], 0b\n\t"
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"vrepg %%v2,%%v0,1\n\t"
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"vrepg %%v3,%%v1,1\n\t"
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"wfcdb %%v2,%%v0\n\t"
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"jne 1f\n\t"
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"vsteg %%v0,%[amin],0\n\t"
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"vmnlg %%v0,%%v1,%%v3\n\t"
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"vlgvg %[iamin],%%v0,0\n\t"
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"j 2f\n\t"
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"1:\n\t"
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"wfchdb %%v4,%%v0,%%v2\n\t"
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"vsel %%v1,%%v3,%%v1,%%v4\n\t"
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"vsel %%v0,%%v2,%%v0,%%v4\n\t"
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"std %%f0,%[amin]\n\t"
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"vlgvg %[iamin],%%v1,0\n\t"
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"2:\n\t"
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"nop 0"
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: [iamin] "=r"(iamin),[amin] "=Q"(*amin),[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", "v3", "v4", "v5", "v16", "v17", "v18",
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"v19", "v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27");
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return iamin;
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}
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BLASLONG 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 minf = 0;
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BLASLONG min = 0;
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BLASLONG inc_x2;
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if (n <= 0 || inc_x <= 0)
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return (min);
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if (inc_x == 1) {
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BLASLONG n1 = n & -16;
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if (n1 > 0) {
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min = izamin_kernel_16(n1, x, &minf);
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ix = n1 * 2;
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i = n1;
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} else {
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minf = 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) < minf) {
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min = i;
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minf = 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 (min + 1);
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} else {
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min = 0;
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minf = 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) < minf) {
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min = i;
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minf = CABS1(x, ix);
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}
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if (CABS1(x, ix + inc_x2) < minf) {
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min = i + 1;
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minf = CABS1(x, ix + inc_x2);
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}
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if (CABS1(x, ix + 2 * inc_x2) < minf) {
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min = i + 2;
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minf = CABS1(x, ix + 2 * inc_x2);
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}
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if (CABS1(x, ix + 3 * inc_x2) < minf) {
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min = i + 3;
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minf = CABS1(x, ix + 3 * inc_x2);
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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) < minf) {
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min = i;
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minf = 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 (min + 1);
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}
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}
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