Common Report Var(flag_tree_vrp) Init(0) Optimization
Perform Value Range Propagation on trees.
+fsplit-paths
+Common Report Var(flag_split_paths) Init(0) Optimization
+Split paths leading to loop backedges.
+
funit-at-a-time
Common Report Var(flag_unit_at_a_time) Init(1)
Compile whole compilation unit at a time.