OpenBLAS/kernel/riscv64/symm_ucopy_rvv_v1.c

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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 VLEV_FLOAT              __riscv_vle32_v_f32m2
#define VSEV_FLOAT              __riscv_vse32_v_f32m2
#define VLSEV_FLOAT             __riscv_vlse32_v_f32m2
#define INT_V_T                 vint32m2_t
#define VID_V_INT               __riscv_vid_v_u32m2
#define VADD_VX_INT             __riscv_vadd_vx_i32m2
#define VMSGT_VX_INT            __riscv_vmsgt_vx_i32m2_b16
#define VBOOL_T                 vbool16_t
#define VMERGE_VVM_FLOAT        __riscv_vmerge_vvm_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 VLEV_FLOAT              __riscv_vle64_v_f64m2
#define VSEV_FLOAT              __riscv_vse64_v_f64m2
#define VLSEV_FLOAT             __riscv_vlse64_v_f64m2
#define INT_V_T                 vint64m2_t
#define VID_V_INT               __riscv_vid_v_u64m2
#define VADD_VX_INT             __riscv_vadd_vx_i64m2
#define VMSGT_VX_INT            __riscv_vmsgt_vx_i64m2_b32
#define VBOOL_T                 vbool32_t
#define VMERGE_VVM_FLOAT        __riscv_vmerge_vvm_f64m2
#define V_UM2_TO_IM2            __riscv_vreinterpret_v_u64m2_i64m2
#endif

// Optimizes the implementation in ../generic/symm_ucopy_4.c

int CNAME(BLASLONG m, BLASLONG n, FLOAT *a, BLASLONG lda, BLASLONG posX, BLASLONG posY, FLOAT *b)
{
    BLASLONG i, js, offset;

    FLOAT *ao1, *ao2;

    BLASLONG stride_lda = sizeof(FLOAT)*lda;
    
    FLOAT_V_T vb, va1, va2;
    VBOOL_T vbool;
    INT_V_T vindex_max, vindex;

    size_t vl = VSETVL_MAX;
    vindex_max   = V_UM2_TO_IM2(VID_V_INT(vl));

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

        ao1 = a + posY + (posX + 0) * lda;
        ao2 = a + posX + 0 + posY * lda;

        for (i = m; i > 0; i--, offset--) {
            va1 = VLSEV_FLOAT(ao1, stride_lda, vl);
            va2 = VLEV_FLOAT(ao2, vl);

            // offset > (0 - vindex)   --->   (offset + vindex) > 0
            vindex = VADD_VX_INT(vindex_max, offset, vl);
            vbool  = VMSGT_VX_INT(vindex, 0, vl);

            vb =  VMERGE_VVM_FLOAT(va2, va1, vbool, vl);
            VSEV_FLOAT(b, vb, vl);

            b += vl;
            ao1++;
            ao2 += lda;
        }
    }

    return 0;
}