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RegionInfo: Update RegionInfo after a BB was split. 

llvm-svn: 116398
This commit is contained in:
Tobias Grosser 2010-10-13 05:54:13 +00:00
parent a8677226ab
commit fe92a9384e
2 changed files with 19 additions and 0 deletions
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6
llvm/include/llvm/Analysis/RegionInfo.h
View File

@ -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()

13
llvm/lib/Analysis/RegionInfo.cpp
View File

@ -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)