99 lines
3.8 KiB
C
99 lines
3.8 KiB
C
/***************************************************************************
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Copyright (c) 2022, 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 <float.h>
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#if !defined(DOUBLE)
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#define VSETVL(n) __riscv_vsetvl_e32m8(n)
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#define VSETVL_MAX __riscv_vsetvlmax_e32m8()
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#define VSETVL_MAX_M1 __riscv_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 VLEV_FLOAT __riscv_vle32_v_f32m8
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#define VLSEV_FLOAT __riscv_vlse32_v_f32m8
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#define VFREDMAXVS_FLOAT __riscv_vfredmax_vs_f32m8_f32m1
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#define VFMVVF_FLOAT __riscv_vfmv_v_f_f32m8
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#define VFMVVF_FLOAT_M1 __riscv_vfmv_v_f_f32m1
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#define VFMAXVV_FLOAT __riscv_vfmax_vv_f32m8
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#define VFMVFS_FLOAT_M1 __riscv_vfmv_f_s_f32m1_f32
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#else
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#define VSETVL(n) __riscv_vsetvl_e64m8(n)
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#define VSETVL_MAX __riscv_vsetvlmax_e64m8()
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#define VSETVL_MAX_M1 __riscv_vsetvlmax_e64m1()
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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 VLEV_FLOAT __riscv_vle64_v_f64m8
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#define VLSEV_FLOAT __riscv_vlse64_v_f64m8
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#define VFREDMAXVS_FLOAT __riscv_vfredmax_vs_f64m8_f64m1
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#define VFMVVF_FLOAT __riscv_vfmv_v_f_f64m8
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#define VFMVVF_FLOAT_M1 __riscv_vfmv_v_f_f64m1
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#define VFMAXVV_FLOAT __riscv_vfmax_vv_f64m8
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#define VFMVFS_FLOAT_M1 __riscv_vfmv_f_s_f64m1_f64
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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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FLOAT maxf = 0.0;
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if (n <= 0 || inc_x <= 0) return(maxf);
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FLOAT_V_T vx, vmax;
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FLOAT_V_T_M1 v_res;
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v_res = VFMVVF_FLOAT_M1(-FLT_MAX, VSETVL_MAX_M1);
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size_t vlmax = VSETVL_MAX;
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vmax = VFMVVF_FLOAT(-FLT_MAX, vlmax);
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if(inc_x == 1) {
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for (size_t vl; n > 0; n -= vl, x += vl) {
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vl = VSETVL(n);
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vx = VLEV_FLOAT(x, vl);
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vmax = VFMAXVV_FLOAT(vmax, vx, vl);
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}
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} else {
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BLASLONG stride_x = inc_x * sizeof(FLOAT);
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for (size_t vl; n > 0; n -= vl, x += vl*inc_x) {
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vl = VSETVL(n);
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vx = VLSEV_FLOAT(x, stride_x, vl);
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vmax = VFMAXVV_FLOAT(vmax, vx, vl);
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}
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}
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v_res = VFREDMAXVS_FLOAT(vmax, v_res, vlmax);
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maxf = VFMVFS_FLOAT_M1(v_res);
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return(maxf);
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}
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