OpenBLAS/kernel/riscv64/zdot_rvv.c

/***************************************************************************
Copyright (c) 2022, The OpenBLAS Project
All rights reserved.
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modification, are permitted provided that the following conditions are
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its contributors may be used to endorse or promote products
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*****************************************************************************/

#include "common.h"

#if !defined(DOUBLE)
#define VSETVL(n) vsetvl_e32m4(n)
#define VSETVL_MAX vsetvlmax_e32m4()
#define VSETVL_MAX_M1 vsetvlmax_e32m1()
#define FLOAT_V_T vfloat32m4_t
#define FLOAT_V_T_M1 vfloat32m1_t
#define VLSEG_FLOAT vlseg2e32_v_f32m4
#define VLSSEG_FLOAT vlsseg2e32_v_f32m4
#define VFREDSUM_FLOAT vfredusum_vs_f32m4_f32m1
#define VFMACCVV_FLOAT vfmacc_vv_f32m4
#define VFMVVF_FLOAT vfmv_v_f_f32m4
#define VFMVVF_FLOAT_M1 vfmv_v_f_f32m1
#define VFMULVV_FLOAT vfmul_vv_f32m4
#define VFMSACVV_FLOAT vfmsac_vv_f32m4
#define VFNMSACVV_FLOAT vfnmsac_vv_f32m4
#define VFMVFS_FLOAT_M1 vfmv_f_s_f32m1_f32
#else
#define VSETVL(n) vsetvl_e64m4(n)
#define VSETVL_MAX vsetvlmax_e64m4()
#define VSETVL_MAX_M1 vsetvlmax_e64m1()
#define FLOAT_V_T vfloat64m4_t
#define FLOAT_V_T_M1 vfloat64m1_t
#define VLSEG_FLOAT vlseg2e64_v_f64m4
#define VLSSEG_FLOAT vlsseg2e64_v_f64m4
#define VFREDSUM_FLOAT vfredusum_vs_f64m4_f64m1
#define VFMACCVV_FLOAT vfmacc_vv_f64m4
#define VFMVVF_FLOAT vfmv_v_f_f64m4
#define VFMVVF_FLOAT_M1 vfmv_v_f_f64m1
#define VFMULVV_FLOAT vfmul_vv_f64m4
#define VFMSACVV_FLOAT vfmsac_vv_f64m4
#define VFNMSACVV_FLOAT vfnmsac_vv_f64m4
#define VFMVFS_FLOAT_M1 vfmv_f_s_f64m1_f64
#endif

OPENBLAS_COMPLEX_FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
{
    OPENBLAS_COMPLEX_FLOAT result;
    CREAL(result) = 0.0;
    CIMAG(result) = 0.0;

    if ( n <= 0 ) return(result);

    FLOAT_V_T vr0, vr1, vx0, vx1, vy0, vy1;
    FLOAT_V_T_M1 v_res, v_z0;
    size_t vlmax_m1 = VSETVL_MAX_M1;
    v_res = VFMVVF_FLOAT_M1(0, vlmax_m1);
    v_z0 = VFMVVF_FLOAT_M1(0, vlmax_m1);

    size_t vlmax = VSETVL_MAX;
    vr0 = VFMVVF_FLOAT(0, vlmax);
    vr1 = VFMVVF_FLOAT(0, vlmax);
 
    if(inc_x == 1 && inc_y == 1) {

        for (size_t vl; n > 0; n -= vl, x += vl*2, y += vl*2) {
            vl = VSETVL(n);

            VLSEG_FLOAT(&vx0, &vx1, x, vl);
            VLSEG_FLOAT(&vy0, &vy1, y, vl);

            vr0 = VFMACCVV_FLOAT(vr0, vx0, vy0, vl);
            vr1 = VFMACCVV_FLOAT(vr1, vx0, vy1, vl);
        #if !defined(CONJ)
            vr0 = VFNMSACVV_FLOAT(vr0, vx1, vy1, vl);
            vr1 = VFMACCVV_FLOAT(vr1, vx1, vy0, vl);
        #else
            vr0 = VFMACCVV_FLOAT(vr0, vx1, vy1, vl);
            vr1 = VFNMSACVV_FLOAT(vr1, vx1, vy0, vl);
        #endif
        }

    }  else if (inc_x == 1){

        BLASLONG stride_y = inc_y * 2 * sizeof(FLOAT);

        for (size_t vl; n > 0; n -= vl, x += vl*2, y += vl*inc_y*2) {
            vl = VSETVL(n);

            VLSEG_FLOAT(&vx0, &vx1, x, vl);
            VLSSEG_FLOAT(&vy0, &vy1, y, stride_y, vl);

            vr0 = VFMACCVV_FLOAT(vr0, vx0, vy0, vl);
            vr1 = VFMACCVV_FLOAT(vr1, vx0, vy1, vl);
        #if !defined(CONJ)
            vr0 = VFNMSACVV_FLOAT(vr0, vx1, vy1, vl);
            vr1 = VFMACCVV_FLOAT(vr1, vx1, vy0, vl);
        #else
            vr0 = VFMACCVV_FLOAT(vr0, vx1, vy1, vl);
            vr1 = VFNMSACVV_FLOAT(vr1, vx1, vy0, vl);
        #endif
        }
    } else if (inc_y == 1){

        BLASLONG stride_x = inc_x * 2 * sizeof(FLOAT);

        for (size_t vl; n > 0; n -= vl, x += vl*inc_x*2, y += vl*2) {
            vl = VSETVL(n);

            VLSSEG_FLOAT(&vx0, &vx1, x, stride_x, vl);
            VLSEG_FLOAT(&vy0, &vy1, y, vl);

            vr0 = VFMACCVV_FLOAT(vr0, vx0, vy0, vl);
            vr1 = VFMACCVV_FLOAT(vr1, vx0, vy1, vl);
        #if !defined(CONJ)
            vr0 = VFNMSACVV_FLOAT(vr0, vx1, vy1, vl);
            vr1 = VFMACCVV_FLOAT(vr1, vx1, vy0, vl);
        #else
            vr0 = VFMACCVV_FLOAT(vr0, vx1, vy1, vl);
            vr1 = VFNMSACVV_FLOAT(vr1, vx1, vy0, vl);
        #endif
        }
    }else {

        BLASLONG stride_x = inc_x * 2 * sizeof(FLOAT);
        BLASLONG stride_y = inc_y * 2 * sizeof(FLOAT);

        for (size_t vl; n > 0; n -= vl, x += vl*inc_x*2, y += vl*inc_y*2) {
            vl = VSETVL(n);

            VLSSEG_FLOAT(&vx0, &vx1, x, stride_x, vl);
            VLSSEG_FLOAT(&vy0, &vy1, y, stride_y, vl);

            vr0 = VFMACCVV_FLOAT(vr0, vx0, vy0, vl);
            vr1 = VFMACCVV_FLOAT(vr1, vx0, vy1, vl);
        #if !defined(CONJ)
            vr0 = VFNMSACVV_FLOAT(vr0, vx1, vy1, vl);
            vr1 = VFMACCVV_FLOAT(vr1, vx1, vy0, vl);
        #else
            vr0 = VFMACCVV_FLOAT(vr0, vx1, vy1, vl);
            vr1 = VFNMSACVV_FLOAT(vr1, vx1, vy0, vl);
        #endif
        }
    }

    v_res = VFREDSUM_FLOAT(v_res, vr0, v_z0, vlmax);
    CREAL(result) = VFMVFS_FLOAT_M1(v_res);
    v_res = VFREDSUM_FLOAT(v_res, vr1, v_z0, vlmax);
    CIMAG(result) = VFMVFS_FLOAT_M1(v_res);
 
   return(result);
}