[llvm-commits] [llvm] r116402 - in /llvm/trunk: include/llvm/Analysis/RegionInfo.h lib/Analysis/RegionInfo.cpp

[Tobias Grosser]

Author: grosser
Date: Wed Oct 13 06:02:44 2010
New Revision: 116402

URL: http://llvm.org/viewvc/llvm-project?rev=116402&view=rev
Log:
Add Region::isTopLevelRegion().

Modified:
    llvm/trunk/include/llvm/Analysis/RegionInfo.h
    llvm/trunk/lib/Analysis/RegionInfo.cpp

Modified: llvm/trunk/include/llvm/Analysis/RegionInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Analysis/RegionInfo.h?rev=116402&r1=116401&r2=116402&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Analysis/RegionInfo.h (original)
+++ llvm/trunk/include/llvm/Analysis/RegionInfo.h Wed Oct 13 06:02:44 2010
@@ -292,6 +292,11 @@
   /// @return The depth of the region.
   unsigned getDepth() const;
 
+  /// @brief Check if a Region is the TopLevel region.
+  ///
+  /// The toplevel region represents the whole function.
+  bool isTopLevelRegion() const { return exit == NULL; };
+
   /// @brief Return a new (non canonical) region, that is obtained by joining
   ///        this region with its predecessors.
   ///

Modified: llvm/trunk/lib/Analysis/RegionInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/RegionInfo.cpp?rev=116402&r1=116401&r2=116402&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/RegionInfo.cpp (original)
+++ llvm/trunk/lib/Analysis/RegionInfo.cpp Wed Oct 13 06:02:44 2010
@@ -140,8 +140,7 @@
 
   BasicBlock *entry = getEntry(), *exit = getExit();
 
-  // TopLevelRegion
-  if (!exit)
+  if (isTopLevelRegion())
     return false;
 
   for (pred_iterator PI = pred_begin(entry), PE = pred_end(entry); PI != PE;
@@ -810,9 +809,10 @@
 void RegionInfo::splitBlock(BasicBlock* NewBB, BasicBlock *OldBB)
 {
   Region *R = getRegionFor(OldBB);
+
   setRegionFor(NewBB, R);
 
-  while (R->getEntry() == OldBB && R->getParent()) {
+  while (R->getEntry() == OldBB && !R->isTopLevelRegion()) {
     R->replaceEntry(NewBB);
     R = R->getParent();
   }