OpenBLAS/kernel/riscv64/gemv_t_vector.c

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#include "common.h"
#if !defined(DOUBLE)
#define VSETVL(n) __riscv_vsetvl_e32m2(n)
#define FLOAT_V_T vfloat32m2_t
#define FLOAT_V_T_M1 vfloat32m1_t
#define VLEV_FLOAT __riscv_vle32_v_f32m2
#define VLSEV_FLOAT __riscv_vlse32_v_f32m2
#define VFREDSUM_FLOAT __riscv_vfredusum_vs_f32m2_f32m1
#define VFMACCVV_FLOAT __riscv_vfmacc_vv_f32m2
#define VFMVVF_FLOAT __riscv_vfmv_v_f_f32m2
#define VFMVVF_FLOAT_M1 __riscv_vfmv_v_f_f32m1
#define VFMULVV_FLOAT __riscv_vfmul_vv_f32m2
#define xint_t int
#else
#define VSETVL(n) __riscv_vsetvl_e64m2(n)
#define FLOAT_V_T vfloat64m2_t
#define FLOAT_V_T_M1 vfloat64m1_t
#define VLEV_FLOAT __riscv_vle64_v_f64m2
#define VLSEV_FLOAT __riscv_vlse64_v_f64m2
#define VFREDSUM_FLOAT __riscv_vfredusum_vs_f64m2_f64m1
#define VFMACCVV_FLOAT __riscv_vfmacc_vv_f64m2
#define VFMVVF_FLOAT __riscv_vfmv_v_f_f64m2
#define VFMVVF_FLOAT_M1 __riscv_vfmv_v_f_f64m1
#define VFMULVV_FLOAT __riscv_vfmul_vv_f64m2
#define xint_t long long
#endif

int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha, FLOAT *a, BLASLONG lda, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *buffer)
{
	BLASLONG i = 0, j = 0, k = 0;
	BLASLONG ix = 0, iy = 0;
	FLOAT *a_ptr = a;
        FLOAT temp;

        FLOAT_V_T va, vr, vx;
        BLASLONG gvl = 0;
        FLOAT_V_T_M1 v_res;


        if(inc_x == 1){
                for(i = 0; i < n; i++){
                        v_res = VFMVVF_FLOAT_M1(0, 1);
                        gvl = VSETVL(m);
                        j = 0;
                        vr = VFMVVF_FLOAT(0, gvl);
                        for(k = 0; k < m/gvl; k++){
                                va = VLEV_FLOAT(&a_ptr[j], gvl);
                                vx = VLEV_FLOAT(&x[j], gvl);
                                vr = VFMULVV_FLOAT(va, vx, gvl);                // could vfmacc here and reduce outside loop
                                v_res = VFREDSUM_FLOAT(vr, v_res, gvl);         // but that reordering diverges far enough from scalar path to make tests fail
                                j += gvl;
                        }
                        if(j < m){
                                gvl = VSETVL(m-j);
                                va = VLEV_FLOAT(&a_ptr[j], gvl);
                                vx = VLEV_FLOAT(&x[j], gvl);
                                vr = VFMULVV_FLOAT(va, vx, gvl);
                                v_res = VFREDSUM_FLOAT(vr, v_res, gvl);
                        }
                        temp = (FLOAT)EXTRACT_FLOAT(v_res);
                        y[iy] += alpha * temp;


                        iy += inc_y;
                        a_ptr += lda;
                }
        }else{
                BLASLONG stride_x = inc_x * sizeof(FLOAT);
                for(i = 0; i < n; i++){
                        v_res = VFMVVF_FLOAT_M1(0, 1);
                        gvl = VSETVL(m);
                        j = 0;
                        ix = 0;
                        vr = VFMVVF_FLOAT(0, gvl);
                        for(k = 0; k < m/gvl; k++){
                                va = VLEV_FLOAT(&a_ptr[j], gvl);
                                vx = VLSEV_FLOAT(&x[ix], stride_x, gvl);
                                vr = VFMULVV_FLOAT(va, vx, gvl);
                                v_res = VFREDSUM_FLOAT(vr, v_res, gvl);
                                j += gvl;
                                ix += inc_x * gvl;
                        }
                        if(j < m){
                                gvl = VSETVL(m-j);
                                va = VLEV_FLOAT(&a_ptr[j], gvl);
                                vx = VLSEV_FLOAT(&x[ix], stride_x, gvl);
                                vr = VFMULVV_FLOAT(va, vx, gvl);
                                v_res = VFREDSUM_FLOAT(vr, v_res, gvl);
                        }
                        temp = (FLOAT)EXTRACT_FLOAT(v_res);
                        y[iy] += alpha * temp;


                        iy += inc_y;
                        a_ptr += lda;
                }
        }


	return(0);
}