[llvm-commits] [llvm] r116398 - in /llvm/trunk: include/llvm/Analysis/RegionInfo.h lib/Analysis/RegionInfo.cpp

[Tobias Grosser]

Author: grosser
Date: Wed Oct 13 00:54:13 2010
New Revision: 116398

URL: http://llvm.org/viewvc/llvm-project?rev=116398&view=rev
Log:
RegionInfo: Update RegionInfo after a BB was split.

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=116398&r1=116397&r2=116398&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Analysis/RegionInfo.h (original)
+++ llvm/trunk/include/llvm/Analysis/RegionInfo.h Wed Oct 13 00:54:13 2010
@@ -638,6 +638,12 @@
     return TopLevelRegion;
   }
 
+  /// @brief Update RegionInfo after a basic block was split.
+  ///
+  /// @param NewBB The basic block that was created before OldBB.
+  /// @param OldBB The old basic block.
+  void splitBlock(BasicBlock* NewBB, BasicBlock *OldBB);
+
   /// @brief Clear the Node Cache for all Regions.
   ///
   /// @see Region::clearNodeCache()

Modified: llvm/trunk/lib/Analysis/RegionInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/RegionInfo.cpp?rev=116398&r1=116397&r2=116398&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/RegionInfo.cpp (original)
+++ llvm/trunk/lib/Analysis/RegionInfo.cpp Wed Oct 13 00:54:13 2010
@@ -807,6 +807,19 @@
   return ret;
 }
 
+void RegionInfo::splitBlock(BasicBlock* NewBB, BasicBlock *OldBB)
+{
+  Region *R = getRegionFor(OldBB);
+  setRegionFor(NewBB, R);
+
+  while (R->getEntry() == OldBB && R->getParent()) {
+    R->replaceEntry(NewBB);
+    R = R->getParent();
+  }
+
+  setRegionFor(OldBB, R);
+}
+
 char RegionInfo::ID = 0;
 INITIALIZE_PASS_BEGIN(RegionInfo, "regions",
                 "Detect single entry single exit regions", true, true)