diff options
Diffstat (limited to 'py/compile.c')
| -rw-r--r-- | py/compile.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/py/compile.c b/py/compile.c index b2811e958..cf9e5079b 100644 --- a/py/compile.c +++ b/py/compile.c @@ -1444,8 +1444,9 @@ STATIC void compile_for_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) { pn_range_start = args[0]; pn_range_end = args[1]; pn_range_step = args[2]; - // We need to know sign of step. This is possible only if it's constant - if (!MP_PARSE_NODE_IS_SMALL_INT(pn_range_step)) { + // the step must be a non-zero constant integer to do the optimisation + if (!MP_PARSE_NODE_IS_SMALL_INT(pn_range_step) + || MP_PARSE_NODE_LEAF_SMALL_INT(pn_range_step) == 0) { optimize = false; } } |