diff options
| -rw-r--r-- | gcc/gimple-range.cc | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/gcc/gimple-range.cc b/gcc/gimple-range.cc index 4d3b1ce8588..3966cfbd14c 100644 --- a/gcc/gimple-range.cc +++ b/gcc/gimple-range.cc @@ -102,7 +102,15 @@ gimple_ranger::range_of_expr (vrange &r, tree expr, gimple *stmt) if (!stmt) { Value_Range tmp (TREE_TYPE (expr)); - m_cache.get_global_range (r, expr); + // If there is no global range for EXPR yet, try to evaluate it. + // This call sets R to a global range regardless. + if (!m_cache.get_global_range (r, expr)) + { + gimple *s = SSA_NAME_DEF_STMT (expr); + // Calculate a range for S if it is safe to do so. + if (s && gimple_bb (s) && gimple_get_lhs (s) == expr) + return range_of_stmt (r, s); + } // Pick up implied context information from the on-entry cache // if current_bb is set. Do not attempt any new calculations. if (current_bb && m_cache.block_range (tmp, current_bb, expr, false)) |