OpenBLAS/kernel/riscv64/gemv_t_rvv.c

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#include "common.h"

#if !defined(DOUBLE)
#define VSETVL(n)               __riscv_vsetvl_e32m8(n)
#define VSETVL_MAX              __riscv_vsetvlmax_e32m8()
#define VSETVL_MAX_M1           __riscv_vsetvlmax_e32m1()
#define FLOAT_V_T               vfloat32m8_t
#define FLOAT_V_T_M1            vfloat32m1_t
#define VLEV_FLOAT              __riscv_vle32_v_f32m8
#define VLSEV_FLOAT             __riscv_vlse32_v_f32m8
#define VFREDSUM_FLOAT          __riscv_vfredusum_vs_f32m8_f32m1
#define VFMACCVV_FLOAT_TU       __riscv_vfmacc_vv_f32m8_tu
#define VFMVVF_FLOAT            __riscv_vfmv_v_f_f32m8
#define VFMVVF_FLOAT_M1         __riscv_vfmv_v_f_f32m1
#define VFMVFS_FLOAT_M1         __riscv_vfmv_f_s_f32m1_f32
#else
#define VSETVL(n)               __riscv_vsetvl_e64m8(n)
#define VSETVL_MAX              __riscv_vsetvlmax_e64m8()
#define VSETVL_MAX_M1           __riscv_vsetvlmax_e64m1()
#define FLOAT_V_T               vfloat64m8_t
#define FLOAT_V_T_M1            vfloat64m1_t
#define VLEV_FLOAT              __riscv_vle64_v_f64m8
#define VLSEV_FLOAT             __riscv_vlse64_v_f64m8
#define VFREDSUM_FLOAT          __riscv_vfredusum_vs_f64m8_f64m1
#define VFMACCVV_FLOAT_TU       __riscv_vfmacc_vv_f64m8_tu
#define VFMVVF_FLOAT            __riscv_vfmv_v_f_f64m8
#define VFMVVF_FLOAT_M1         __riscv_vfmv_v_f_f64m1
#define VFMVFS_FLOAT_M1         __riscv_vfmv_f_s_f64m1_f64
#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, j;
    FLOAT *a_ptr, *x_ptr;

    FLOAT_V_T va, vx, vr;
    FLOAT_V_T_M1 v_res, v_z0;
    size_t vlmax = VSETVL_MAX_M1;
    v_z0 = VFMVVF_FLOAT_M1(0, vlmax);
    vlmax = VSETVL_MAX;

    if(inc_x == 1) {

        for(i = 0; i < n; i++) {
            j = m;
            a_ptr = a;
            x_ptr = x;
            vr = VFMVVF_FLOAT(0, vlmax);

            for (size_t vl; j > 0; j -= vl, a_ptr += vl, x_ptr += vl) {
                vl = VSETVL(j);

                va = VLEV_FLOAT(a_ptr, vl);
                vx = VLEV_FLOAT(x_ptr, vl);
                vr = VFMACCVV_FLOAT_TU(vr, va, vx, vl);
            }

            v_res = VFREDSUM_FLOAT(vr, v_z0, vlmax);
            *y += alpha * VFMVFS_FLOAT_M1(v_res);
            y += inc_y;
            a += lda;
        }

    } else {

        BLASLONG stride_x = inc_x * sizeof(FLOAT);
  
        for(i = 0; i < n; i++) {
            j = m;
            a_ptr = a;
            x_ptr = x;
            vr = VFMVVF_FLOAT(0, vlmax);

            for (size_t vl; j > 0; j -= vl, a_ptr += vl, x_ptr += vl*inc_x) {
                vl = VSETVL(j);

                va = VLEV_FLOAT(a_ptr, vl);
                vx = VLSEV_FLOAT(x_ptr, stride_x, vl);
                vr = VFMACCVV_FLOAT_TU(vr, va, vx, vl);
            }

            v_res = VFREDSUM_FLOAT(vr, v_z0, vlmax);
            *y += alpha * VFMVFS_FLOAT_M1(v_res);
            y += inc_y;
            a += lda;
        }

    }

    return(0);
}