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make gvn marginally faster by reallocating the lastSeenLoad map for
each basic block. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48660 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1287,6 +1287,7 @@ bool GVN::iterateOnFunction(Function &F) {
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DominatorTree &DT = getAnalysis<DominatorTree>();
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SmallVector<Instruction*, 4> toErase;
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DenseMap<Value*, LoadInst*> lastSeenLoad;
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// Top-down walk of the dominator tree
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for (df_iterator<DomTreeNode*> DI = df_begin(DT.getRootNode()),
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@ -1294,7 +1295,7 @@ bool GVN::iterateOnFunction(Function &F) {
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// Get the set to update for this block
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ValueNumberedSet& currAvail = availableOut[DI->getBlock()];
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DenseMap<Value*, LoadInst*> lastSeenLoad;
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lastSeenLoad.clear();
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BasicBlock* BB = DI->getBlock();
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