diff options
Diffstat (limited to 'py/sequence.c')
| -rw-r--r-- | py/sequence.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/py/sequence.c b/py/sequence.c index cd1a96617..32db640dc 100644 --- a/py/sequence.c +++ b/py/sequence.c @@ -88,15 +88,22 @@ bool mp_seq_get_fast_slice_indexes(mp_uint_t len, mp_obj_t slice, mp_bound_slice if (start < 0) { start = len + start; if (start < 0) { - start = 0; + if (indexes->step < 0) { + start = -1; + } else { + start = 0; + } } } else if (indexes->step > 0 && (mp_uint_t)start > len) { start = len; - } else if (indexes->step < 0 && (mp_uint_t)start > len - 1) { + } else if (indexes->step < 0 && (mp_uint_t)start >= len) { start = len - 1; } if (stop < 0) { stop = len + stop; + if (stop < 0) { + stop = -1; + } if (indexes->step < 0) { stop += 1; } |