OpenBLAS/kernel/riscv64/gemm_ncopy_8_rvv.c

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#include "common.h"

#if !defined(DOUBLE)
#define VSETVL(n)               __riscv_vsetvl_e32m1(n)
#define FLOAT_V_T               vfloat32m1_t
#define VLEV_FLOAT              __riscv_vle32_v_f32m1
#define VSEV_FLOAT              __riscv_vse32_v_f32m1
#define VSSEG2_FLOAT            __riscv_vsseg2e32_v_f32m1
#define VSSEG4_FLOAT            __riscv_vsseg4e32_v_f32m1
#define VSSEG8_FLOAT            __riscv_vsseg8e32_v_f32m1
#else
#define VSETVL(n)               __riscv_vsetvl_e64m1(n)
#define FLOAT_V_T               vfloat64m1_t
#define VLEV_FLOAT              __riscv_vle64_v_f64m1
#define VSEV_FLOAT              __riscv_vse64_v_f64m1
#define VSSEG2_FLOAT            __riscv_vsseg2e64_v_f64m1
#define VSSEG4_FLOAT            __riscv_vsseg4e64_v_f64m1
#define VSSEG8_FLOAT            __riscv_vsseg8e64_v_f64m1
#endif

// Optimizes the implementation in ../generic/gemm_ncopy_8.c

int CNAME(BLASLONG m, BLASLONG n, FLOAT *a, BLASLONG lda, FLOAT *b)
{
    BLASLONG i, j;

    FLOAT *a_offset;
    FLOAT *a_offset1, *a_offset2, *a_offset3, *a_offset4;
    FLOAT *a_offset5, *a_offset6, *a_offset7, *a_offset8;
    FLOAT *b_offset;

    FLOAT_V_T v1, v2, v3, v4, v5, v6, v7, v8;
    size_t vl;

    //fprintf(stderr, "gemm_ncopy_8 m=%ld n=%ld lda=%ld\n", m, n, lda);

    a_offset = a;
    b_offset = b;

    for(j = (n >> 3); j > 0; j--) {
        a_offset1  = a_offset;
        a_offset2  = a_offset1 + lda;
        a_offset3  = a_offset2 + lda;
        a_offset4  = a_offset3 + lda;
        a_offset5  = a_offset4 + lda;
        a_offset6  = a_offset5 + lda;
        a_offset7  = a_offset6 + lda;
        a_offset8  = a_offset7 + lda;
        a_offset += 8 * lda;

        for(i = m; i > 0; i -= vl) {
            vl = VSETVL(i);

            v1 = VLEV_FLOAT(a_offset1, vl);
            v2 = VLEV_FLOAT(a_offset2, vl);
            v3 = VLEV_FLOAT(a_offset3, vl);
            v4 = VLEV_FLOAT(a_offset4, vl);
            v5 = VLEV_FLOAT(a_offset5, vl);
            v6 = VLEV_FLOAT(a_offset6, vl);
            v7 = VLEV_FLOAT(a_offset7, vl);
            v8 = VLEV_FLOAT(a_offset8, vl);

            VSSEG8_FLOAT(b_offset, v1, v2, v3, v4, v5, v6, v7, v8, vl);

            a_offset1 += vl;
            a_offset2 += vl;
            a_offset3 += vl;
            a_offset4 += vl;
            a_offset5 += vl;
            a_offset6 += vl;
            a_offset7 += vl;
            a_offset8 += vl;
            b_offset += vl*8;
        }
    }

    if (n & 4) {
        a_offset1  = a_offset;
        a_offset2  = a_offset1 + lda;
        a_offset3  = a_offset2 + lda;
        a_offset4  = a_offset3 + lda;
        a_offset += 4 * lda;

        for(i = m; i > 0; i -= vl) {
            vl = VSETVL(i);

            v1 = VLEV_FLOAT(a_offset1, vl);
            v2 = VLEV_FLOAT(a_offset2, vl);
            v3 = VLEV_FLOAT(a_offset3, vl);
            v4 = VLEV_FLOAT(a_offset4, vl);

            VSSEG4_FLOAT(b_offset, v1, v2, v3, v4, vl);

            a_offset1 += vl;
            a_offset2 += vl;
            a_offset3 += vl;
            a_offset4 += vl;
            b_offset += vl*4;
        }
    }

    if (n & 2) {
        a_offset1  = a_offset;
        a_offset2  = a_offset1 + lda;
        a_offset += 2 * lda;

        for(i = m; i > 0; i -= vl) {
            vl = VSETVL(i);

            v1 = VLEV_FLOAT(a_offset1, vl);
            v2 = VLEV_FLOAT(a_offset2, vl);

            VSSEG2_FLOAT(b_offset, v1, v2, vl);

            a_offset1 += vl;
            a_offset2 += vl;
            b_offset += vl*2;
        }
    }

    if (n & 1) {
        a_offset1  = a_offset;

        for(i = m; i > 0; i -= vl) {
            vl = VSETVL(i);

            v1 = VLEV_FLOAT(a_offset1, vl);

            VSEV_FLOAT(b_offset, v1, vl);

            a_offset1 += vl;
            b_offset += vl;
        }
    }

    return 0;
}