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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
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@ -638,6 +638,12 @@ public:
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return TopLevelRegion;
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}
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/// @brief Update RegionInfo after a basic block was split.
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///
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/// @param NewBB The basic block that was created before OldBB.
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/// @param OldBB The old basic block.
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void splitBlock(BasicBlock* NewBB, BasicBlock *OldBB);
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/// @brief Clear the Node Cache for all Regions.
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///
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/// @see Region::clearNodeCache()
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@ -807,6 +807,19 @@ RegionInfo::getCommonRegion(SmallVectorImpl<BasicBlock*> &BBs) const {
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return ret;
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}
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void RegionInfo::splitBlock(BasicBlock* NewBB, BasicBlock *OldBB)
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{
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Region *R = getRegionFor(OldBB);
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setRegionFor(NewBB, R);
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while (R->getEntry() == OldBB && R->getParent()) {
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R->replaceEntry(NewBB);
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R = R->getParent();
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}
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setRegionFor(OldBB, R);
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}
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char RegionInfo::ID = 0;
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INITIALIZE_PASS_BEGIN(RegionInfo, "regions",
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"Detect single entry single exit regions", true, true)
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