// itself is not, but in practice runtime seems to be in the order of magnitude
// of dominance tree calculation.
//
+// WARNING: LLVM is generally very concerned about compile time such that
+// the use of additional analysis passes in the default
+// optimization sequence is avoided as much as possible.
+// Specifically, if you do not need the RegionInfo, but dominance
+// information could be sufficient please base your work only on
+// the dominator tree. Most passes maintain it, such that using
+// it has often near zero cost. In contrast RegionInfo is by
+// default not available, is not maintained by existing
+// transformations and there is no intention to do so.
+//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_REGIONINFO_H