OpenBLAS/kernel/riscv64/nrm2_vector_dot.c

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#include "common.h"
#if !defined(DOUBLE)
#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 VFREDSUM_FLOAT vfredsumvs_float32xm8
#define VFMACCVV_FLOAT vfmaccvv_float32xm8
#define VFMVVF_FLOAT vfmvvf_float32xm8
#define VFDOTVV_FLOAT vfdotvv_float32xm8
#define ABS fabsf
#else
#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 VFREDSUM_FLOAT vfredsumvs_float64xm8
#define VFMACCVV_FLOAT vfmaccvv_float64xm8
#define VFMVVF_FLOAT vfmvvf_float64xm8
#define VFDOTVV_FLOAT vfdotvv_float64xm8
#define ABS fabs
#endif

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

	if ( n < 0 )  return(0.0);
        if(n == 1) return (ABS(x[0]));

        FLOAT_V_T vr, v0, v1;
        unsigned int gvl = 0;
        if(inc_x == 1){
                gvl = vsetvli(n, RVV_EFLOAT, RVV_M);
                if(gvl < n/2){
                        vr = VFMVVF_FLOAT(0, gvl);
                        for(i=0,j=0; i<n/(2*gvl); i++){
                                v0 = VLEV_FLOAT(&x[j], gvl);
                                vr = VFMACCVV_FLOAT(vr, v0, v0, gvl);
                                j += gvl;

                                v1 = VLEV_FLOAT(&x[j], gvl);
                                vr = VFMACCVV_FLOAT(vr, v1, v1, gvl);
                                j += gvl;
                        }
                        v0 = VFMVVF_FLOAT(0, gvl);
                        v0 = VFREDSUM_FLOAT(vr, v0, gvl);
                        len += v0[0];
                }
                //tail
                for(;j < n;){
                        gvl = vsetvli(n-j, RVV_EFLOAT, RVV_M);
                        v0 = VLEV_FLOAT(&x[j], gvl);
                        //v1 = 0
                        v1 = VFMVVF_FLOAT(0, gvl);
                        //vr = VFDOTVV_FLOAT(v0, v0, gvl);
                        vr = VFMACCVV_FLOAT(v1, v0, v0, gvl);
                        v0 = VFREDSUM_FLOAT(vr, v1, gvl);
                        len += v0[0];

                        j += gvl;
                }
        }else{
                gvl = vsetvli(n, RVV_EFLOAT, RVV_M);
                unsigned int stride_x = inc_x * sizeof(FLOAT);
                if(gvl < n/2){
                        vr = VFMVVF_FLOAT(0, gvl);
                        for(i=0,j=0; i<n/(2*gvl); i++){
                                v0 = VLSEV_FLOAT(&x[j*inc_x], stride_x, gvl);
                                vr = VFMACCVV_FLOAT(vr, v0, v0, gvl);
                                j += gvl;

                                v1 = VLSEV_FLOAT(&x[j*inc_x], stride_x, gvl);
                                vr = VFMACCVV_FLOAT(vr, v1, v1, gvl);
                                j += gvl;
                        }
                        v0 = VFMVVF_FLOAT(0, gvl);
                        v0 = VFREDSUM_FLOAT(vr, v0, gvl);
                        len += v0[0];
                }
                //tail
                for(;j < n;){
                        gvl = vsetvli(n-j, RVV_EFLOAT, RVV_M);
                        v0 = VLSEV_FLOAT(&x[j*inc_x], stride_x, gvl);
                        //v1 = 0
                        v1 = VFMVVF_FLOAT(0, gvl);
                        //vr = VFDOTVV_FLOAT(v0, v0, gvl);
                        vr = VFMACCVV_FLOAT(v1, v0, v0, gvl);
                        v0 = VFREDSUM_FLOAT(vr, v1, gvl);
                        len += v0[0];

                        j += gvl;
                }
        }
	return(sqrt(len));
}