182 lines
7.6 KiB
C
182 lines
7.6 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) __riscv_vsetvl_e64m8(n)
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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 MASK_T vbool8_t
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#define VMFLTVV_FLOAT __riscv_vmflt_vv_f64m8_b8
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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 VMFGEVF_FLOAT __riscv_vmfge_vf_f64m8_b8
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#define VMFIRSTM __riscv_vfirst_m_b8
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#define UINT_V_T vuint64m8_t
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#define VIDV_MASK_UINT __riscv_vid_v_u64m8_mu
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#define VIDV_UINT __riscv_vid_v_u64m8
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#define VADDVX_MASK_UINT __riscv_vadd_vx_u64m8_mu
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#define VADDVX_UINT __riscv_vadd_vx_u64m8
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#define VMVVX_UINT __riscv_vmv_v_x_u64m8
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#define VCOMPRESS __riscv_vcompress_vm_u64m8
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#define VMV_X __riscv_vmv_x_s_u64m8_u64
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#else
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#define VSETVL(n) __riscv_vsetvl_e32m8(n)
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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 MASK_T vbool4_t
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#define VMFLTVV_FLOAT __riscv_vmflt_vv_f32m8_b4
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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 VMFGEVF_FLOAT __riscv_vmfge_vf_f32m8_b4
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#define VMFIRSTM __riscv_vfirst_m_b4
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#define UINT_V_T vuint32m8_t
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#define VIDV_MASK_UINT __riscv_vid_v_u32m8_mu
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#define VIDV_UINT __riscv_vid_v_u32m8
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#define VADDVX_MASK_UINT __riscv_vadd_vx_u32m8_mu
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#define VADDVX_UINT __riscv_vadd_vx_u32m8
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#define VMVVX_UINT __riscv_vmv_v_x_u32m8
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#define VCOMPRESS __riscv_vcompress_vm_u32m8
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#define VMV_X __riscv_vmv_x_s_u32m8_u32
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#endif
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BLASLONG 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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unsigned int max_index = 0;
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if (n <= 0 || inc_x <= 0) return(max_index);
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FLOAT maxf=-FLT_MAX;
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FLOAT_V_T vx, v_max;
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UINT_V_T v_max_index;
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MASK_T mask;
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unsigned int gvl = 0;
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FLOAT_V_T_M1 v_res;
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v_res = VFMVVF_FLOAT_M1(-FLT_MAX, 1);
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if(inc_x == 1){
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gvl = VSETVL(n);
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v_max_index = VMVVX_UINT(0, gvl);
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v_max = VFMVVF_FLOAT(-FLT_MAX, gvl);
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for(i=0,j=0; i < n/gvl; i++){
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vx = VLEV_FLOAT(&x[j], gvl);
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//index where element greater than v_max
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mask = VMFLTVV_FLOAT(v_max, vx, gvl);
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v_max_index = VIDV_MASK_UINT(mask, v_max_index, gvl);
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v_max_index = VADDVX_MASK_UINT(mask, v_max_index, v_max_index, j, gvl);
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//update v_max and start_index j
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v_max = VFMAXVV_FLOAT(v_max, vx, gvl);
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j += gvl;
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}
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v_res = VFREDMAXVS_FLOAT(v_max, v_res, gvl);
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maxf = EXTRACT_FLOAT(v_res);
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mask = VMFGEVF_FLOAT(v_max, maxf, gvl);
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UINT_V_T compressed;
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compressed = VCOMPRESS(v_max_index, mask, gvl);
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max_index = VMV_X(compressed);
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if(j < n){
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gvl = VSETVL(n-j);
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v_max = VLEV_FLOAT(&x[j], gvl);
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v_res = VFREDMAXVS_FLOAT(v_max, v_res, gvl);
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FLOAT cur_maxf = EXTRACT_FLOAT(v_res);
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if(cur_maxf > maxf){
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//tail index
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v_max_index = VIDV_UINT(gvl);
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v_max_index = VADDVX_UINT(v_max_index, j, gvl);
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mask = VMFGEVF_FLOAT(v_max, cur_maxf, gvl);
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UINT_V_T compressed;
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compressed = VCOMPRESS(v_max_index, mask, gvl);
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max_index = VMV_X(compressed);
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}
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}
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}else{
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gvl = VSETVL(n);
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unsigned int stride_x = inc_x * sizeof(FLOAT);
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unsigned int idx = 0, inc_v = gvl * inc_x;
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v_max = VFMVVF_FLOAT(-FLT_MAX, gvl);
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v_max_index = VMVVX_UINT(0, gvl);
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for(i=0,j=0; i < n/gvl; i++){
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vx = VLSEV_FLOAT(&x[idx], stride_x, gvl);
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//index where element greater than v_max
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mask = VMFLTVV_FLOAT(v_max, vx, gvl);
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v_max_index = VIDV_MASK_UINT(mask, v_max_index, gvl);
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v_max_index = VADDVX_MASK_UINT(mask, v_max_index, v_max_index, j, gvl);
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//update v_max and start_index j
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v_max = VFMAXVV_FLOAT(v_max, vx, gvl);
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j += gvl;
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idx += inc_v;
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}
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v_res = VFREDMAXVS_FLOAT(v_max, v_res, gvl);
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maxf = EXTRACT_FLOAT(v_res);
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mask = VMFGEVF_FLOAT(v_max, maxf, gvl);
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UINT_V_T compressed;
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compressed = VCOMPRESS(v_max_index, mask, gvl);
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max_index = VMV_X(compressed);
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if(j < n){
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gvl = VSETVL(n-j);
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v_max = VLSEV_FLOAT(&x[idx], stride_x, gvl);
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v_res = VFREDMAXVS_FLOAT(v_max, v_res, gvl);
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FLOAT cur_maxf = EXTRACT_FLOAT(v_res);
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if(cur_maxf > maxf){
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//tail index
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v_max_index = VIDV_UINT(gvl);
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v_max_index = VADDVX_UINT(v_max_index, j, gvl);
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mask = VMFGEVF_FLOAT(v_max, cur_maxf, gvl);
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UINT_V_T compressed;
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compressed = VCOMPRESS(v_max_index, mask, gvl);
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max_index = VMV_X(compressed);
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}
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}
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}
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return(max_index+1);
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}
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