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*****************************************************************************/

#include "common.h"

#if !defined(DOUBLE)
#define VSETVL(n)               __riscv_vsetvl_e32m2(n)
#define VSETVL_MAX              __riscv_vsetvlmax_e32m2()
#define FLOAT_V_T               vfloat32m2_t
#define FLOAT_VX2_T             vfloat32m2x2_t
#define VGET_VX2                __riscv_vget_v_f32m2x2_f32m2
#define VSET_VX2                __riscv_vset_v_f32m2_f32m2x2
#define VLEV_FLOAT              __riscv_vle32_v_f32m2
#define VSEV_FLOAT              __riscv_vse32_v_f32m2
#define VLSEV_FLOAT             __riscv_vlse32_v_f32m2
#define VLSEG2_FLOAT            __riscv_vlseg2e32_v_f32m2x2
#define VLSSEG2_FLOAT           __riscv_vlsseg2e32_v_f32m2x2
#define VSSEG2_FLOAT            __riscv_vsseg2e32_v_f32m2x2
#define INT_V_T                 vint32m2_t
#define VID_V_INT               __riscv_vid_v_u32m2
#define VADD_VX_INT             __riscv_vadd_vx_i32m2
#define VFRSUB_VF_FLOAT         __riscv_vfrsub_vf_f32m2
#define VMSGT_VX_INT            __riscv_vmsgt_vx_i32m2_b16
#define VMSLT_VX_INT            __riscv_vmslt_vx_i32m2_b16
#define VMSEQ_VX_INT            __riscv_vmseq_vx_i32m2_b16
#define VBOOL_T                 vbool16_t
#define VMERGE_VVM_FLOAT        __riscv_vmerge_vvm_f32m2
#define VFMVVF_FLOAT            __riscv_vfmv_v_f_f32m2
#define V_UM2_TO_IM2            __riscv_vreinterpret_v_u32m2_i32m2
#else
#define VSETVL(n)               __riscv_vsetvl_e64m2(n)
#define VSETVL_MAX              __riscv_vsetvlmax_e64m2()
#define FLOAT_V_T               vfloat64m2_t
#define FLOAT_VX2_T             vfloat64m2x2_t
#define VGET_VX2                __riscv_vget_v_f64m2x2_f64m2
#define VSET_VX2                __riscv_vset_v_f64m2_f64m2x2
#define VLEV_FLOAT              __riscv_vle64_v_f64m2
#define VSEV_FLOAT              __riscv_vse64_v_f64m2
#define VLSEV_FLOAT             __riscv_vlse64_v_f64m2
#define VLSEG2_FLOAT            __riscv_vlseg2e64_v_f64m2x2
#define VLSSEG2_FLOAT           __riscv_vlsseg2e64_v_f64m2x2
#define VSSEG2_FLOAT            __riscv_vsseg2e64_v_f64m2x2
#define INT_V_T                 vint64m2_t
#define VID_V_INT               __riscv_vid_v_u64m2
#define VADD_VX_INT             __riscv_vadd_vx_i64m2
#define VFRSUB_VF_FLOAT         __riscv_vfrsub_vf_f64m2
#define VMSGT_VX_INT            __riscv_vmsgt_vx_i64m2_b32
#define VMSLT_VX_INT            __riscv_vmslt_vx_i64m2_b32
#define VMSEQ_VX_INT            __riscv_vmseq_vx_i64m2_b32
#define VBOOL_T                 vbool32_t
#define VMERGE_VVM_FLOAT        __riscv_vmerge_vvm_f64m2
#define VFMVVF_FLOAT            __riscv_vfmv_v_f_f64m2
#define V_UM2_TO_IM2            __riscv_vreinterpret_v_u64m2_i64m2
#endif


int CNAME(BLASLONG m, BLASLONG n, FLOAT *a, BLASLONG lda, BLASLONG posX, BLASLONG posY, FLOAT *b)
{
    //fprintf(stderr, "%s, %s, m=%ld n=%ld lda=%ld posX=%ld posY=%ld\n", __FUNCTION__, __FILE__, m, n, lda, posX, posY);

    BLASLONG i, js, offset;

    FLOAT *ao1, *ao2;

    BLASLONG stride_lda = sizeof(FLOAT) * lda * 2;

    FLOAT_V_T vb0, vb1, vb2, va10, va11, va20, va21, vzero;
    FLOAT_VX2_T va1x2, va2x2, vbx2;
    VBOOL_T vbool_gt0, vbool_lt0, vbool_eq0;
    INT_V_T vindex_max, vindex;

    size_t vl = VSETVL_MAX;
    vindex_max   = V_UM2_TO_IM2(VID_V_INT(vl));
    vzero = VFMVVF_FLOAT(ZERO, vl);

    for (js = n; js > 0; js -= vl, posX += vl) {
        vl = VSETVL(js);
        offset = posX - posY;

        ao1 = a + posX * 2 + posY * lda * 2;
        ao2 = a + posY * 2 + posX * lda * 2;

        for (i = m; i > 0; i--, offset--) {
            va2x2 = VLSSEG2_FLOAT(ao2, stride_lda, vl);
            va1x2 = VLSEG2_FLOAT(ao1, vl);

            va20 = VGET_VX2(va2x2, 0);
            va21 = VGET_VX2(va2x2, 1);
            va10 = VGET_VX2(va1x2, 0);
            va11 = VGET_VX2(va1x2, 1);

            vindex = VADD_VX_INT(vindex_max, offset, vl);
            vbool_gt0  = VMSGT_VX_INT(vindex, 0, vl);
            vbool_lt0  = VMSLT_VX_INT(vindex, 0, vl);
            vbool_eq0  = VMSEQ_VX_INT(vindex, 0, vl);

            vb0 =  VMERGE_VVM_FLOAT(va20, va10, vbool_gt0, vl);
            vb1 =  VMERGE_VVM_FLOAT(va21, va11, vbool_gt0, vl);

            vb2 = VFRSUB_VF_FLOAT(vb1, ZERO, vl);

            vb1 =  VMERGE_VVM_FLOAT(vb1, vb2, vbool_lt0, vl);
            vb1 =  VMERGE_VVM_FLOAT(vb1, vzero, vbool_eq0, vl);

            vbx2 = VSET_VX2(vbx2, 0, vb0);
            vbx2 = VSET_VX2(vbx2, 1, vb1);
            VSSEG2_FLOAT(b, vbx2, vl);

            b   += vl * 2;
            ao1 += lda * 2;
            ao2 += 2;
        }
    }
    
    return 0;
}
