OpenBLAS/kernel/riscv64/dot_vector.c

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#include "common.h"
#if !defined(DOUBLE)
#define RVV_EFLOAT RVV_E32
#define RVV_M RVV_M4
#define FLOAT_V_T float32xm4_t
#define VLEV_FLOAT vlev_float32xm4
#define VLSEV_FLOAT vlsev_float32xm4
#define VFREDSUM_FLOAT vfredsumvs_float32xm4
#define VFMACCVV_FLOAT vfmaccvv_float32xm4
#define VFMVVF_FLOAT vfmvvf_float32xm4
#define VFDOTVV_FLOAT vfdotvv_float32xm4
#else
#define RVV_EFLOAT RVV_E64
#define RVV_M RVV_M4
#define FLOAT_V_T float64xm4_t
#define VLEV_FLOAT vlev_float64xm4
#define VLSEV_FLOAT vlsev_float64xm4
#define VFREDSUM_FLOAT vfredsumvs_float64xm4
#define VFMACCVV_FLOAT vfmaccvv_float64xm4
#define VFMVVF_FLOAT vfmvvf_float64xm4
#define VFDOTVV_FLOAT vfdotvv_float64xm4
#endif

#if defined(DSDOT)
double CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
#else
FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
#endif
{
	BLASLONG i=0, j=0;
	double dot = 0.0 ;

	if ( n < 0 )  return(dot);

        FLOAT_V_T vr, vx, vy;
        unsigned int gvl = 0;
        if(inc_x == 1 && inc_y == 1){
                gvl = vsetvli(n, RVV_EFLOAT, RVV_M);
                vr = VFMVVF_FLOAT(0, gvl);
                for(i=0,j=0; i<n/gvl; i++){
                        vx = VLEV_FLOAT(&x[j], gvl);
                        vy = VLEV_FLOAT(&y[j], gvl);
                        vr = VFMACCVV_FLOAT(vr, vx, vy, gvl);
                        j += gvl;
                }
                if(j > 0){
                        vx = VFMVVF_FLOAT(0, gvl);
                        vx = VFREDSUM_FLOAT(vr, vx, gvl);
                        dot += vx[0];
                }
                //tail
                if(j < n){
                        gvl = vsetvli(n-j, RVV_EFLOAT, RVV_M);
                        vx = VLEV_FLOAT(&x[j], gvl);
                        vy = VLEV_FLOAT(&y[j], gvl);
                        FLOAT_V_T vz = VFMVVF_FLOAT(0, gvl);
                        //vr = VFDOTVV_FLOAT(vx, vy, gvl);
                        vr = VFMACCVV_FLOAT(vz, vx, vy, gvl);
                        vx = VFREDSUM_FLOAT(vr, vz, gvl);
                        dot += vx[0];
                }
        }else if(inc_y == 1){
                gvl = vsetvli(n, RVV_EFLOAT, RVV_M);
                vr = VFMVVF_FLOAT(0, gvl);
                unsigned int stride_x = inc_x * sizeof(FLOAT);
                for(i=0,j=0; i<n/gvl; i++){
                        vx = VLSEV_FLOAT(&x[j*inc_x], stride_x, gvl);
                        vy = VLEV_FLOAT(&y[j], gvl);
                        vr = VFMACCVV_FLOAT(vr, vx, vy, gvl);
                        j += gvl;
                }
                if(j > 0){
                        vx = VFMVVF_FLOAT(0, gvl);
                        vx = VFREDSUM_FLOAT(vr, vx, gvl);
                        dot += vx[0];
                }
                //tail
                if(j < n){
                        gvl = vsetvli(n-j, RVV_EFLOAT, RVV_M);
                        vx = VLSEV_FLOAT(&x[j*inc_x], stride_x, gvl);
                        vy = VLEV_FLOAT(&y[j], gvl);
                        FLOAT_V_T vz = VFMVVF_FLOAT(0, gvl);
                        //vr = VFDOTVV_FLOAT(vx, vy, gvl);
                        vr = VFMACCVV_FLOAT(vz, vx, vy, gvl);
                        vx = VFREDSUM_FLOAT(vr, vz, gvl);
                        dot += vx[0];
                }
        }else if(inc_x == 1){
                gvl = vsetvli(n, RVV_EFLOAT, RVV_M);
                vr = VFMVVF_FLOAT(0, gvl);
                unsigned int stride_y = inc_y * sizeof(FLOAT);
                for(i=0,j=0; i<n/gvl; i++){
                        vx = VLEV_FLOAT(&x[j], gvl);
                        vy = VLSEV_FLOAT(&y[j*inc_y], stride_y, gvl);
                        vr = VFMACCVV_FLOAT(vr, vx, vy, gvl);
                        j += gvl;
                }
                if(j > 0){
                        vx = VFMVVF_FLOAT(0, gvl);
                        vx = VFREDSUM_FLOAT(vr, vx, gvl);
                        dot += vx[0];
                }
                //tail
                if(j < n){
                        gvl = vsetvli(n-j, RVV_EFLOAT, RVV_M);
                        vx = VLEV_FLOAT(&x[j], gvl);
                        vy = VLSEV_FLOAT(&y[j*inc_y], stride_y, gvl);
                        FLOAT_V_T vz = VFMVVF_FLOAT(0, gvl);
                        //vr = VFDOTVV_FLOAT(vx, vy, gvl);
                        vr = VFMACCVV_FLOAT(vz, vx, vy, gvl);
                        vx = VFREDSUM_FLOAT(vr, vz, gvl);
                        dot += vx[0];
                }
        }else{
                gvl = vsetvli(n, RVV_EFLOAT, RVV_M);
                vr = VFMVVF_FLOAT(0, gvl);
                unsigned int stride_x = inc_x * sizeof(FLOAT);
                unsigned int stride_y = inc_y * sizeof(FLOAT);
                for(i=0,j=0; i<n/gvl; i++){
                        vx = VLSEV_FLOAT(&x[j*inc_x], stride_x, gvl);
                        vy = VLSEV_FLOAT(&y[j*inc_y], stride_y, gvl);
                        vr = VFMACCVV_FLOAT(vr, vx, vy, gvl);
                        j += gvl;
                }
                if(j > 0){
                        vx = VFMVVF_FLOAT(0, gvl);
                        vx = VFREDSUM_FLOAT(vr, vx, gvl);
                        dot += vx[0];
                }
                //tail
                if(j < n){
                        gvl = vsetvli(n-j, RVV_EFLOAT, RVV_M);
                        vx = VLSEV_FLOAT(&x[j*inc_x], stride_x, gvl);
                        vy = VLSEV_FLOAT(&y[j*inc_y], stride_y, gvl);
                        FLOAT_V_T vz = VFMVVF_FLOAT(0, gvl);
                        //vr = VFDOTVV_FLOAT(vx, vy, gvl);
                        vr = VFMACCVV_FLOAT(vz, vx, vy, gvl);
                        vx = VFREDSUM_FLOAT(vr, vz, gvl);
                        dot += vx[0];
                }
        }
	return(dot);
}