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- /***************************************************************************
- Copyright (c) 2020, The OpenBLAS Project
- All rights reserved.
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are
- met:
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- 2. Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in
- the documentation and/or other materials provided with the
- distribution.
- 3. Neither the name of the OpenBLAS project nor the names of
- its contributors may be used to endorse or promote products
- derived from this software without specific prior written permission.
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
- USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *****************************************************************************/
-
- #include "common.h"
- #include <math.h>
- #include <float.h>
-
- #if defined(DOUBLE)
-
- #define ABS fabs
- #define RVV_EFLOAT RVV_E64
- #define RVV_M RVV_M8
- #define FLOAT_V_T float64xm8_t
- #define VLEV_FLOAT vlev_float64xm8
- #define VLSEV_FLOAT vlsev_float64xm8
- #define VFREDMAXVS_FLOAT vfredmaxvs_float64xm8
- #define MASK_T e64xm8_t
- #define VMFLTVV_FLOAT vmfltvv_e64xm8_float64xm8
- #define VFMVVF_FLOAT vfmvvf_float64xm8
- #define VFMAXVV_FLOAT vfmaxvv_float64xm8
- #define VMFGEVF_FLOAT vmfgevf_e64xm8_float64xm8
- #define VMFIRSTM vmfirstm_e64xm8
- #define UINT_V_T uint64xm8_t
- #define VIDV_MASK_UINT vidv_mask_uint64xm8
- #define VIDV_UINT vidv_uint64xm8
- #define VADDVX_MASK_UINT vaddvx_mask_uint64xm8
- #define VADDVX_UINT vaddvx_uint64xm8
- #define VMVVX_UINT vmvvx_uint64xm8
- #else
-
- #define ABS fabsf
- #define RVV_EFLOAT RVV_E32
- #define RVV_M RVV_M8
- #define FLOAT_V_T float32xm8_t
- #define VLEV_FLOAT vlev_float32xm8
- #define VLSEV_FLOAT vlsev_float32xm8
- #define VFREDMAXVS_FLOAT vfredmaxvs_float32xm8
- #define MASK_T e32xm8_t
- #define VMFLTVV_FLOAT vmfltvv_e32xm8_float32xm8
- #define VFMVVF_FLOAT vfmvvf_float32xm8
- #define VFMAXVV_FLOAT vfmaxvv_float32xm8
- #define VMFGEVF_FLOAT vmfgevf_e32xm8_float32xm8
- #define VMFIRSTM vmfirstm_e32xm8
- #define UINT_V_T uint32xm8_t
- #define VIDV_MASK_UINT vidv_mask_uint32xm8
- #define VIDV_UINT vidv_uint32xm8
- #define VADDVX_MASK_UINT vaddvx_mask_uint32xm8
- #define VADDVX_UINT vaddvx_uint32xm8
- #define VMVVX_UINT vmvvx_uint32xm8
- #endif
-
-
- BLASLONG CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
- {
- BLASLONG i=0, j=0;
- unsigned int max_index = 0;
- if (n <= 0 || inc_x <= 0) return(max_index);
- FLOAT maxf=-FLT_MAX;
-
- FLOAT_V_T vx, v_max;
- UINT_V_T v_max_index;
- MASK_T mask;
- unsigned int gvl = 0;
- if(inc_x == 1){
- gvl = vsetvli(n, RVV_EFLOAT, RVV_M);
- v_max_index = VMVVX_UINT(0, gvl);
- v_max = VFMVVF_FLOAT(-FLT_MAX, gvl);
- for(i=0,j=0; i < n/gvl; i++){
- vx = VLEV_FLOAT(&x[j], gvl);
-
- //index where element greater than v_max
- mask = VMFLTVV_FLOAT(v_max, vx, gvl);
- v_max_index = VIDV_MASK_UINT(v_max_index, mask, gvl);
- v_max_index = VADDVX_MASK_UINT(v_max_index, v_max_index, j, mask, gvl);
-
- //update v_max and start_index j
- v_max = VFMAXVV_FLOAT(v_max, vx, gvl);
- j += gvl;
- }
- vx = VFMVVF_FLOAT(-FLT_MAX, gvl);
- vx = VFREDMAXVS_FLOAT(v_max, vx, gvl);
- maxf = vx[0];
- mask = VMFGEVF_FLOAT(v_max, maxf, gvl);
- max_index = VMFIRSTM(mask,gvl);
- max_index = v_max_index[max_index];
-
- if(j < n){
- gvl = vsetvli(n-j, RVV_EFLOAT, RVV_M);
- v_max = VLEV_FLOAT(&x[j], gvl);
-
- vx = VFMVVF_FLOAT(-FLT_MAX, gvl);
- vx = VFREDMAXVS_FLOAT(v_max, vx, gvl);
- FLOAT cur_maxf = vx[0];
- if(cur_maxf > maxf){
- //tail index
- v_max_index = VIDV_UINT(gvl);
- v_max_index = VADDVX_UINT(v_max_index, j, gvl);
-
- mask = VMFGEVF_FLOAT(v_max, cur_maxf, gvl);
- max_index = VMFIRSTM(mask,gvl);
- max_index = v_max_index[max_index];
- }
- }
- }else{
- gvl = vsetvli(n, RVV_EFLOAT, RVV_M);
- unsigned int stride_x = inc_x * sizeof(FLOAT);
- unsigned int idx = 0, inc_v = gvl * inc_x;
-
- v_max = VFMVVF_FLOAT(-FLT_MAX, gvl);
- v_max_index = VMVVX_UINT(0, gvl);
- for(i=0,j=0; i < n/gvl; i++){
- vx = VLSEV_FLOAT(&x[idx], stride_x, gvl);
-
- //index where element greater than v_max
- mask = VMFLTVV_FLOAT(v_max, vx, gvl);
- v_max_index = VIDV_MASK_UINT(v_max_index, mask, gvl);
- v_max_index = VADDVX_MASK_UINT(v_max_index, v_max_index, j, mask, gvl);
-
- //update v_max and start_index j
- v_max = VFMAXVV_FLOAT(v_max, vx, gvl);
- j += gvl;
- idx += inc_v;
- }
- vx = VFMVVF_FLOAT(-FLT_MAX, gvl);
- vx = VFREDMAXVS_FLOAT(v_max, vx, gvl);
- maxf = vx[0];
- mask = VMFGEVF_FLOAT(v_max, maxf, gvl);
- max_index = VMFIRSTM(mask,gvl);
- max_index = v_max_index[max_index];
-
- if(j < n){
- gvl = vsetvli(n-j, RVV_EFLOAT, RVV_M);
- v_max = VLSEV_FLOAT(&x[idx], stride_x, gvl);
-
- vx = VFMVVF_FLOAT(-FLT_MAX, gvl);
- vx = VFREDMAXVS_FLOAT(v_max, vx, gvl);
- FLOAT cur_maxf = vx[0];
- if(cur_maxf > maxf){
- //tail index
- v_max_index = VIDV_UINT(gvl);
- v_max_index = VADDVX_UINT(v_max_index, j, gvl);
-
- mask = VMFGEVF_FLOAT(v_max, cur_maxf, gvl);
- max_index = VMFIRSTM(mask,gvl);
- max_index = v_max_index[max_index];
- }
- }
- }
- return(max_index+1);
- }
-
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