CSAPP 5.5 Reducing Procedure Calls

8		for (i = 0; i < length; i++) {
9			data_t val;
10			get_vec_element(v, i, &val);
11			*dest = *dest OP val;
12		}

1	data_t *get_vec_start(vec_ptr v)
2	{
3		return v->data;
4	}

1	/* Direct access to vector data */
2	void combine3(vec_ptr v, data_t *dest)
3	{
4		long i;
5		long length = vec_length(v);
6		data_t *data = get_vec_start(v); 
7
8		*dest = IDENT;
9		for (i = 0; i < length; i++) {
10			*dest = *dest OP data[i];
11		}
12	}