OpenBLAS/kernel/riscv64/rot_rvv.c

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#include "common.h"

#if !defined(DOUBLE)
#define VSETVL(n)               __riscv_vsetvl_e32m8(n)
#define FLOAT_V_T               vfloat32m8_t
#define VLEV_FLOAT              __riscv_vle32_v_f32m8
#define VLSEV_FLOAT             __riscv_vlse32_v_f32m8
#define VSEV_FLOAT              __riscv_vse32_v_f32m8
#define VSSEV_FLOAT             __riscv_vsse32_v_f32m8
#define VFMACCVF_FLOAT          __riscv_vfmacc_vf_f32m8
#define VFMULVF_FLOAT           __riscv_vfmul_vf_f32m8
#define VFMSACVF_FLOAT          __riscv_vfmsac_vf_f32m8
#else
#define VSETVL(n)               __riscv_vsetvl_e64m8(n)
#define FLOAT_V_T               vfloat64m8_t
#define VLEV_FLOAT              __riscv_vle64_v_f64m8
#define VLSEV_FLOAT             __riscv_vlse64_v_f64m8
#define VSEV_FLOAT              __riscv_vse64_v_f64m8
#define VSSEV_FLOAT             __riscv_vsse64_v_f64m8
#define VFMACCVF_FLOAT          __riscv_vfmacc_vf_f64m8
#define VFMULVF_FLOAT           __riscv_vfmul_vf_f64m8
#define VFMSACVF_FLOAT          __riscv_vfmsac_vf_f64m8
#endif

int CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT c, FLOAT s)
{

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

    FLOAT_V_T v0, v1, vx, vy;

    if (inc_x == 0 || inc_y == 0) {
        BLASLONG i=0;
        BLASLONG ix=0,iy=0;
        FLOAT temp;
        while(i < n)
        {
            temp   = c*x[ix] + s*y[iy] ;
            y[iy]  = c*y[iy] - s*x[ix] ;
            x[ix]  = temp ;

            ix += inc_x ;
            iy += inc_y ;
            i++ ;
        }
    }
    else if(inc_x == 1 && inc_y == 1) {

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

            vx = VLEV_FLOAT(x, vl);
            vy = VLEV_FLOAT(y, vl);

            v0 = VFMULVF_FLOAT(vx, c, vl);
            v0 = VFMACCVF_FLOAT(v0, s, vy, vl);
            VSEV_FLOAT(x, v0, vl);

            v1 = VFMULVF_FLOAT(vx, s, vl);
            v1 = VFMSACVF_FLOAT(v1, c, vy, vl);
            VSEV_FLOAT(y, v1, vl);
        }

    } else if(inc_y == 1) {
        BLASLONG stride_x = inc_x * sizeof(FLOAT);

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

            vx = VLSEV_FLOAT(x, stride_x, vl);
            vy = VLEV_FLOAT(y, vl);

            v0 = VFMULVF_FLOAT(vx, c, vl);
            v0 = VFMACCVF_FLOAT(v0, s, vy, vl);
            VSSEV_FLOAT(x, stride_x, v0, vl);

            v1 = VFMULVF_FLOAT(vx, s, vl);
            v1 = VFMSACVF_FLOAT(v1, c, vy, vl);
            VSEV_FLOAT(y, v1, vl);
        }
 
    } else if(inc_x == 1) {
        BLASLONG stride_y = inc_y * sizeof(FLOAT);

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

            vx = VLEV_FLOAT(x, vl);
            vy = VLSEV_FLOAT(y, stride_y, vl);

            v0 = VFMULVF_FLOAT(vx, c, vl);
            v0 = VFMACCVF_FLOAT(v0, s, vy, vl);
            VSEV_FLOAT(x, v0, vl);

            v1 = VFMULVF_FLOAT(vx, s, vl);
            v1 = VFMSACVF_FLOAT(v1, c, vy, vl);
            VSSEV_FLOAT(y, stride_y, v1, vl);
        }

    } else {
        BLASLONG stride_x = inc_x * sizeof(FLOAT);
        BLASLONG stride_y = inc_y * sizeof(FLOAT);

        for (size_t vl; n > 0; n -= vl, x += vl*inc_x, y += vl*inc_y) {
            vl = VSETVL(n);
 
            vx = VLSEV_FLOAT(x, stride_x, vl);
            vy = VLSEV_FLOAT(y, stride_y, vl);

            v0 = VFMULVF_FLOAT(vx, c, vl);
            v0 = VFMACCVF_FLOAT(v0, s, vy, vl);
            VSSEV_FLOAT(x, stride_x, v0, vl);

            v1 = VFMULVF_FLOAT(vx, s, vl);
            v1 = VFMSACVF_FLOAT(v1, c, vy, vl);
            VSSEV_FLOAT(y, stride_y, v1, vl);
        }

    }
    
    return(0);
}