From: Tobias Grosser <grosser@fim.uni-passau.de>
Date: Wed, 13 Oct 2010 05:54:13 +0000 (+0000)
Subject: RegionInfo: Update RegionInfo after a BB was split.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=592316c4198023431799f8e597860b31ea7116c9;p=oota-llvm.git

RegionInfo: Update RegionInfo after a BB was split.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116398 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/Analysis/RegionInfo.h b/include/llvm/Analysis/RegionInfo.h
index f982b9f9ff3..4e7d303863b 100644
--- a/include/llvm/Analysis/RegionInfo.h
+++ b/include/llvm/Analysis/RegionInfo.h
@@ -638,6 +638,12 @@ public:
     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()
diff --git a/lib/Analysis/RegionInfo.cpp b/lib/Analysis/RegionInfo.cpp
index 2576d4ee14a..4a0a9a3ccec 100644
--- a/lib/Analysis/RegionInfo.cpp
+++ b/lib/Analysis/RegionInfo.cpp
@@ -807,6 +807,19 @@ RegionInfo::getCommonRegion(SmallVectorImpl<BasicBlock*> &BBs) const {
   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)