| 1963 | # gen's use. |
| 1964 | |
| 1965 | def _gen3(i): |
| 1966 | assert i < n and (n-i) % 3 == 0 |
| 1967 | ip1, ip2, ip3 = i+1, i+2, i+3 |
| 1968 | g, g1, g2 = gs[i : ip3] |
| 1969 | |
| 1970 | if ip3 >= n: |
| 1971 | # These are the last three, so we can yield values directly. |
| 1972 | for values[i] in g(): |
| 1973 | for values[ip1] in g1(): |
| 1974 | for values[ip2] in g2(): |
| 1975 | yield values |
| 1976 | |
| 1977 | else: |
| 1978 | # At least 6 loop nests remain; peel off 3 and recurse for the |
| 1979 | # rest. |
| 1980 | for values[i] in g(): |
| 1981 | for values[ip1] in g1(): |
| 1982 | for values[ip2] in g2(): |
| 1983 | for x in _gen3(ip3): |
| 1984 | yield x |
| 1985 | |
| 1986 | for x in gen(0): |
| 1987 | yield x |