OpenBLAS/kernel/riscv64/zgemm_ncopy_4_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 VLSEG2_FLOAT            __riscv_vlseg2e32_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 VLSEG2_FLOAT            __riscv_vlseg2e64_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/zgemm_ncopy_4.c

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

    FLOAT *aoffset;
    FLOAT *aoffset1, *aoffset2, *aoffset3, *aoffset4;

    FLOAT *boffset;

    FLOAT_V_T v11, v12, v21, v22, v31, v32, v41, v42;
    size_t vl;

    aoffset = a;
    boffset = b;
    lda *= 2;

    for (j = (n >> 2); j > 0; j--) {
        aoffset1  = aoffset;
        aoffset2  = aoffset1 + lda;
        aoffset3  = aoffset2 + lda;
        aoffset4  = aoffset3 + lda;
        aoffset  += 4 * lda;

        for (i = m; i > 0; i -= vl) {
            vl = VSETVL(i);
            VLSEG2_FLOAT(&v11, &v12, aoffset1, vl);
            VLSEG2_FLOAT(&v21, &v22, aoffset2, vl);
            VLSEG2_FLOAT(&v31, &v32, aoffset3, vl);
            VLSEG2_FLOAT(&v41, &v42, aoffset4, vl);

            VSSEG8_FLOAT(boffset, v11, v12, v21, v22, v31, v32, v41, v42, vl);

            aoffset1 += vl * 2;
            aoffset2 += vl * 2;
            aoffset3 += vl * 2;
            aoffset4 += vl * 2;
            boffset  += vl * 8;
        }
    }

    if (n & 2) {
        aoffset1  = aoffset;
        aoffset2  = aoffset1 + lda;
        aoffset  += 2 * lda;
        
        for (i = m; i > 0; i -= vl) {
            vl = VSETVL(i);
            VLSEG2_FLOAT(&v11, &v12, aoffset1, vl);
            VLSEG2_FLOAT(&v21, &v22, aoffset2, vl);
        
            VSSEG4_FLOAT(boffset, v11, v12, v21, v22, vl);
        
            aoffset1 += vl * 2;
            aoffset2 += vl * 2;
            boffset  += vl * 4;
        }
    }

    if (n & 1) {
        aoffset1  = aoffset;
        aoffset  += lda;

        for (i = m; i > 0; i -= vl) {
            vl = VSETVL(i);
            VLSEG2_FLOAT(&v11, &v12, aoffset1, vl);

            VSSEG2_FLOAT(boffset, v11, v12, vl);

            aoffset1 += vl * 2;
            boffset  += vl * 2;
        }
    }

     return 0;
}