114 lines
4.5 KiB
C
114 lines
4.5 KiB
C
/***************************************************************************
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Copyright (c) 2020, 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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#include <float.h>
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#if !defined(DOUBLE)
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#define VSETVL(n) vsetvl_e32m8(n)
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#define VSETVL_MAX vsetvlmax_e32m1()
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#define FLOAT_V_T vfloat32m8_t
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#define FLOAT_V_T_M1 vfloat32m1_t
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#define VFMVFS_FLOAT vfmv_f_s_f32m1_f32
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#define VLSEV_FLOAT vlse32_v_f32m8
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#define VFREDMINVS_FLOAT vfredmin_vs_f32m8_f32m1
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#define MASK_T vbool4_t
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#define VMFLTVF_FLOAT vmflt_vf_f32m8_b4
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#define VFMVVF_FLOAT vfmv_v_f_f32m8
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#define VFMVVF_FLOAT_M1 vfmv_v_f_f32m1
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#define VFRSUBVF_MASK_FLOAT vfrsub_vf_f32m8_m
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#define VFMINVV_FLOAT vfmin_vv_f32m8
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#define VFADDVV_FLOAT vfadd_vv_f32m8
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#else
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#define VSETVL(n) vsetvl_e64m8(n)
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#define VSETVL_MAX vsetvlmax_e32m1()
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#define FLOAT_V_T vfloat64m8_t
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#define FLOAT_V_T_M1 vfloat64m1_t
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#define VFMVFS_FLOAT vfmv_f_s_f64m1_f64
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#define VLSEV_FLOAT vlse64_v_f64m8
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#define VFREDMINVS_FLOAT vfredmin_vs_f64m8_f64m1
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#define MASK_T vbool8_t
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#define VMFLTVF_FLOAT vmflt_vf_f64m8_b8
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#define VFMVVF_FLOAT vfmv_v_f_f64m8
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#define VFMVVF_FLOAT_M1 vfmv_v_f_f64m1
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#define VFRSUBVF_MASK_FLOAT vfrsub_vf_f64m8_m
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#define VFMINVV_FLOAT vfmin_vv_f64m8
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#define VFADDVV_FLOAT vfadd_vv_f64m8
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#endif
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FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
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{
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BLASLONG i=0, j=0;
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BLASLONG ix=0;
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if (n <= 0 || inc_x <= 0) return(0.0);
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FLOAT minf=FLT_MAX;
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unsigned int gvl = 0;
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FLOAT_V_T v0, v1, v_min;
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FLOAT_V_T_M1 v_res, v_max;
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gvl = VSETVL_MAX;
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v_res = VFMVVF_FLOAT_M1(0, gvl);
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v_max = VFMVVF_FLOAT_M1(FLT_MAX, gvl);
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MASK_T mask0, mask1;
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BLASLONG stride_x = inc_x * sizeof(FLOAT) * 2;
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gvl = VSETVL(n);
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v_min = VFMVVF_FLOAT(FLT_MAX, gvl);
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BLASLONG inc_xv = inc_x * gvl * 2;
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for(; i<n/gvl; i++){
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v0 = VLSEV_FLOAT(&x[ix], stride_x, gvl);
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v1 = VLSEV_FLOAT(&x[ix+1], stride_x, gvl);
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mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
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v0 = VFRSUBVF_MASK_FLOAT(mask0, v0, v0, 0, gvl);
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mask1 = VMFLTVF_FLOAT(v1, 0, gvl);
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v1 = VFRSUBVF_MASK_FLOAT(mask1, v1, v1, 0, gvl);
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v0 = VFADDVV_FLOAT(v0, v1, gvl);
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v_min = VFMINVV_FLOAT(v_min, v0, gvl);
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j += gvl;
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ix += inc_xv;
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}
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v_res = VFREDMINVS_FLOAT(v_res, v_min, v_max, gvl);
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minf = VFMVFS_FLOAT(v_res);
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if(j<n){
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gvl = VSETVL(n-j);
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v0 = VLSEV_FLOAT(&x[ix], stride_x, gvl);
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v1 = VLSEV_FLOAT(&x[ix+1], stride_x, gvl);
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mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
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v0 = VFRSUBVF_MASK_FLOAT(mask0, v0, v0, 0, gvl);
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mask1 = VMFLTVF_FLOAT(v1, 0, gvl);
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v1 = VFRSUBVF_MASK_FLOAT(mask1, v1, v1, 0, gvl);
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v1 = VFADDVV_FLOAT(v0, v1, gvl);
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v_res = VFREDMINVS_FLOAT(v_res, v1, v_max, gvl);
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if(VFMVFS_FLOAT(v_res) < minf)
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minf = VFMVFS_FLOAT(v_res);
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}
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return(minf);
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}
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