OK, I couldn't resist:

use Inline C => <<'EoF';

void fast_c (int num, ...) {
    Inline_Stack_Vars;

    int rnum = num;
    SV** buckets;
    int stack_ptr = Inline_Stack_Items - 1;

    buckets = (SV**)malloc(sizeof(SV*) * num);

    while (rnum) {
        int this = stack_ptr / rnum--;
        AV* bucket = newAV();
        while (this--) {
            av_unshift(bucket, 1);
            av_store(bucket, 0, Inline_Stack_Item(stack_ptr--));
        }
        buckets[rnum] = newRV_inc((SV*)bucket);
    }

    Inline_Stack_Reset;

    while (rnum < num) {
        Inline_Stack_Push(sv_2mortal(buckets[rnum++]));
    }

    free(buckets);

    Inline_Stack_Done;
    Inline_Stack_Return(num);
}

EoF
[download]

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