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Add caching of predecessor counts as well as predecessors themselves.

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llvm-svn: 69791
This commit is contained in:
Owen Anderson 2009-04-22 08:46:33 +00:00
parent b36babc111
commit 1cf271e1d8
1 changed files with 9 additions and 0 deletions
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9
include/llvm/Support/PredIteratorCache.h
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@ -27,6 +27,7 @@ namespace llvm {
class PredIteratorCache {
/// BlockToPredsMap - Pointer to null-terminated list.
DenseMap<BasicBlock*, BasicBlock**> BlockToPredsMap;
DenseMap<BasicBlock*, unsigned> BlockToPredCountMap;
/// Memory - This is the space that holds cached preds.
BumpPtrAllocator Memory;
@ -45,14 +46,22 @@ namespace llvm {
SmallVector<BasicBlock*, 32> PredCache(pred_begin(BB), pred_end(BB));
PredCache.push_back(0); // null terminator.
BlockToPredCountMap[BB] = PredCache.size()-1;
Entry = Memory.Allocate<BasicBlock*>(PredCache.size());
std::copy(PredCache.begin(), PredCache.end(), Entry);
return Entry;
}
unsigned GetNumPreds(BasicBlock *BB) {
GetPreds(BB);
return BlockToPredCountMap[BB];
}
/// clear - Remove all information.
void clear() {
BlockToPredsMap.clear();
BlockToPredCountMap.clear();
Memory.Reset();
}
};