/***************************************************************************
Copyright (c) 2020, The OpenBLAS Project
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*****************************************************************************/

#include "common.h"
#include <math.h>

#if !defined(DOUBLE)
#define VSETVL(n) vsetvl_e32m8(n)
#define VSETVL_MAX vsetvlmax_e32m1()
#define FLOAT_V_T vfloat32m8_t
#define FLOAT_V_T_M1 vfloat32m1_t
#define VLEV_FLOAT vle_v_f32m8
#define VLSEV_FLOAT vlse_v_f32m8
#define VFREDSUMVS_FLOAT vfredsum_vs_f32m8_f32m1
#define MASK_T vbool4_t
#define VMFLTVF_FLOAT vmflt_vf_f32m8_b4
#define VFMVVF_FLOAT vfmv_v_f_f32m8
#define VFMVVF_FLOAT_M1 vfmv_v_f_f32m1
#define VFRSUBVF_MASK_FLOAT vfrsub_vf_f32m8_m
#define VFADDVV_FLOAT vfadd_vv_f32m8
#else
#define VSETVL(n) vsetvl_e64m8(n)
#define VSETVL_MAX vsetvlmax_e64m1()
#define FLOAT_V_T vfloat64m8_t
#define FLOAT_V_T_M1 vfloat64m1_t
#define VLEV_FLOAT vle_v_f64m8
#define VLSEV_FLOAT vlse_v_f64m8
#define VFREDSUMVS_FLOAT vfredsum_vs_f64m8_f64m1
#define MASK_T vbool8_t
#define VMFLTVF_FLOAT vmflt_vf_f64m8_b8
#define VFMVVF_FLOAT vfmv_v_f_f64m8
#define VFMVVF_FLOAT_M1 vfmv_v_f_f64m1
#define VFRSUBVF_MASK_FLOAT vfrsub_vf_f64m8_m
#define VFADDVV_FLOAT vfadd_vv_f64m8
#endif
FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
{
	BLASLONG i=0, j=0;
	BLASLONG ix=0;
	FLOAT asumf=0.0;
	if (n <= 0 || inc_x <= 0) return(asumf);
        unsigned int gvl = 0;
        FLOAT_V_T v0, v1, v_zero,v_sum;
        FLOAT_V_T_M1 v_res, v_z0;
        gvl = VSETVL_MAX;
        v_res = VFMVVF_FLOAT_M1(0, gvl);
        v_z0 = VFMVVF_FLOAT_M1(0, gvl);

        MASK_T mask0, mask1;
        if(inc_x == 1){
                gvl = VSETVL(n);
                v_zero = VFMVVF_FLOAT(0, gvl);
                if(gvl <= n/2){
                        v_sum = VFMVVF_FLOAT(0, gvl);
                        for(i=0,j=0; i<n/(gvl*2); i++){
                                v0 = VLEV_FLOAT(&x[j], gvl);
                                mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
                                v0 = VFRSUBVF_MASK_FLOAT(mask0, v0, v0, 0, gvl);
                                v_sum = VFADDVV_FLOAT(v_sum, v0, gvl);

                                v1 = VLEV_FLOAT(&x[j+gvl], gvl);
                                mask1 = VMFLTVF_FLOAT(v1, 0, gvl);
                                v1 = VFRSUBVF_MASK_FLOAT(mask1, v1, v1, 0, gvl);
                                v_sum = VFADDVV_FLOAT(v_sum, v1, gvl);
                                j += gvl * 2;
                        }
                        v_res = VFREDSUMVS_FLOAT(v_res, v_sum, v_z0, gvl);
                        asumf += v_res[0];
                }
                for(;j<n;){
                        gvl = VSETVL(n-j);
                        v0 = VLEV_FLOAT(&x[j], gvl);
                        mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
                        v0 = VFRSUBVF_MASK_FLOAT(mask0, v0, v0, 0, gvl);
                        v_res = VFREDSUMVS_FLOAT(v_res, v0, v_z0, gvl);
                        asumf += v_res[0];
                        j += gvl;
                }
        }else{
                gvl = VSETVL(n);
                unsigned int stride_x = inc_x * sizeof(FLOAT);
                v_zero = VFMVVF_FLOAT(0, gvl);
                if(gvl <= n/2){
                        v_sum = VFMVVF_FLOAT(0, gvl);
                        BLASLONG inc_xv = inc_x * gvl;
                        for(i=0,j=0; i<n/(gvl*2); i++){
                                v0 = VLSEV_FLOAT(&x[ix], stride_x, gvl);
                                mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
                                v0 = VFRSUBVF_MASK_FLOAT(mask0, v0, v0, 0, gvl);
                                v_sum = VFADDVV_FLOAT(v_sum, v0, gvl);

                                v1 = VLSEV_FLOAT(&x[ix+inc_xv], stride_x, gvl);
                                mask1 = VMFLTVF_FLOAT(v1, 0, gvl);
                                v1 = VFRSUBVF_MASK_FLOAT(mask1, v1, v1, 0, gvl);
                                v_sum = VFADDVV_FLOAT(v_sum, v1, gvl);
                                j += gvl * 2;
                                inc_xv += inc_xv * 2;
                        }
                        v_res = VFREDSUMVS_FLOAT(v_res, v_sum, v_z0, gvl);
                        asumf += v_res[0];
                }
                for(;j<n;){
                        gvl = VSETVL(n-j);
                        v0 = VLSEV_FLOAT(&x[j*inc_x], stride_x, gvl);
                        mask0 = VMFLTVF_FLOAT(v0, 0, gvl);
                        v0 = VFRSUBVF_MASK_FLOAT(mask0, v0, v0, 0, gvl);
                        v_res = VFREDSUMVS_FLOAT(v_res, v0, v_z0, gvl);
                        asumf += v_res[0];
                        j += gvl;
                }
        }
	return(asumf);
}


