diff options
Diffstat (limited to 'gcc/tree-vrp.c')
| -rw-r--r-- | gcc/tree-vrp.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index c5ca287..2bc22c6 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -847,6 +847,23 @@ update_value_range (const_tree var, value_range_t *new_vr) value_range_t *old_vr; bool is_new; + /* If there is a value-range on the SSA name from earlier analysis + factor that in. */ + if (INTEGRAL_TYPE_P (TREE_TYPE (var))) + { + wide_int min, max; + value_range_type rtype = get_range_info (var, &min, &max); + if (rtype == VR_RANGE || rtype == VR_ANTI_RANGE) + { + value_range_d nr; + nr.type = rtype; + nr.min = wide_int_to_tree (TREE_TYPE (var), min); + nr.max = wide_int_to_tree (TREE_TYPE (var), max); + nr.equiv = NULL; + vrp_intersect_ranges (new_vr, &nr); + } + } + /* Update the value range, if necessary. */ old_vr = get_value_range (var); is_new = old_vr->type != new_vr->type |