OpenBLAS/kernel/riscv64/dsdot_vector.c

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#include "common.h"

double CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
{
        BLASLONG i=0, j=0;
        double dot = 0.0 ;

        if ( n < 1 )  return(dot);
        vfloat64m4_t vr;
        vfloat32m2_t vx, vy;
        unsigned int gvl = 0;
        vfloat64m1_t v_res, v_z0;
        gvl = vsetvlmax_e64m1();
        v_res = vfmv_v_f_f64m1(0, gvl);
        v_z0 = vfmv_v_f_f64m1(0, gvl);

        if(inc_x == 1 && inc_y == 1){
                gvl = vsetvl_e64m4(n);
                vr = vfmv_v_f_f64m4(0, gvl);
                for(i=0,j=0; i<n/gvl; i++){
                        vx = vle32_v_f32m2(&x[j], gvl);
                        vy = vle32_v_f32m2(&y[j], gvl);
                        vr = vfwmacc_vv_f64m4(vr, vx, vy, gvl);
                        j += gvl;
                }
                if(j > 0){
                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
                        dot += (double)vfmv_f_s_f64m1_f64(v_res);
                }
                //tail
                if(j < n){
                        gvl = vsetvl_e64m4(n-j);
                        vx = vle32_v_f32m2(&x[j], gvl);
                        vy = vle32_v_f32m2(&y[j], gvl);
                        vfloat64m4_t vz = vfmv_v_f_f64m4(0, gvl);
                        //vr = vfdot_vv_f32m2(vx, vy, gvl);
                        vr = vfwmacc_vv_f64m4(vz, vx, vy, gvl);
                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
                        dot += (double)vfmv_f_s_f64m1_f64(v_res);
                }
        }else if(inc_y == 1){
                gvl = vsetvl_e64m4(n);
                vr = vfmv_v_f_f64m4(0, gvl);
                 int stride_x = inc_x * sizeof(FLOAT);
                for(i=0,j=0; i<n/gvl; i++){
                        vx = vlse32_v_f32m2(&x[j*inc_x], stride_x, gvl);
                        vy = vle32_v_f32m2(&y[j], gvl);
                        vr = vfwmacc_vv_f64m4(vr, vx, vy, gvl);
                        j += gvl;
                }
                if(j > 0){
                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
                        dot += (double)vfmv_f_s_f64m1_f64(v_res);

                }
                //tail
                if(j < n){
                        gvl = vsetvl_e64m4(n-j);
                        vx = vlse32_v_f32m2(&x[j*inc_x], stride_x, gvl);
                        vy = vle32_v_f32m2(&y[j], gvl);
                        vfloat64m4_t vz = vfmv_v_f_f64m4(0, gvl);
                        //vr = vfdot_vv_f32m2(vx, vy, gvl);
                        vr = vfwmacc_vv_f64m4(vz, vx, vy, gvl);
                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
                        dot += (double)vfmv_f_s_f64m1_f64(v_res);

                }
        }else if(inc_x == 1){
                gvl = vsetvl_e64m4(n);
                vr = vfmv_v_f_f64m4(0, gvl);
                 int stride_y = inc_y * sizeof(FLOAT);
                for(i=0,j=0; i<n/gvl; i++){
                        vx = vle32_v_f32m2(&x[j], gvl);
                        vy = vlse32_v_f32m2(&y[j*inc_y], stride_y, gvl);
                        vr = vfwmacc_vv_f64m4(vr, vx, vy, gvl);
                        j += gvl;
                }
                if(j > 0){
                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
                        dot += (double)vfmv_f_s_f64m1_f64(v_res);

                }
                //tail
                if(j < n){
                        gvl = vsetvl_e64m4(n-j);
                        vx = vle32_v_f32m2(&x[j], gvl);
                        vy = vlse32_v_f32m2(&y[j*inc_y], stride_y, gvl);
                        vfloat64m4_t vz = vfmv_v_f_f64m4(0, gvl);
                        //vr = vfdot_vv_f32m2(vx, vy, gvl);
                        vr = vfwmacc_vv_f64m4(vz, vx, vy, gvl);
                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
                        dot += (double)vfmv_f_s_f64m1_f64(v_res);

                }
        }else{
                gvl = vsetvl_e64m4(n);
                vr = vfmv_v_f_f64m4(0, gvl);
                 int stride_x = inc_x * sizeof(FLOAT);
                 int stride_y = inc_y * sizeof(FLOAT);
                for(i=0,j=0; i<n/gvl; i++){
                        vx = vlse32_v_f32m2(&x[j*inc_x], stride_x, gvl);
                        vy = vlse32_v_f32m2(&y[j*inc_y], stride_y, gvl);
                        vr = vfwmacc_vv_f64m4(vr, vx, vy, gvl);
                        j += gvl;
                }
                if(j > 0){
                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
                        dot += (double)vfmv_f_s_f64m1_f64(v_res);

                }
                //tail
                if(j < n){
                        gvl = vsetvl_e64m4(n-j);
                        vx = vlse32_v_f32m2(&x[j*inc_x], stride_x, gvl);
                        vy = vlse32_v_f32m2(&y[j*inc_y], stride_y, gvl);
                        vfloat64m4_t vz = vfmv_v_f_f64m4(0, gvl);
                        //vr = vfdot_vv_f32m2(vx, vy, gvl);
                        vr = vfwmacc_vv_f64m4(vz, vx, vy, gvl);
                        v_res = vfredusum_vs_f64m4_f64m1(v_res, vr, v_z0, gvl);
                        dot += (double)vfmv_f_s_f64m1_f64(v_res);

                }
        }
        return(dot);
}