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Generalize GVN's phi construciton routine to work for things other than loads.

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llvm-svn: 61009
This commit is contained in:
Owen Anderson 2008-12-14 19:10:35 +00:00
parent ef671b5627
commit 47efff5b14
1 changed files with 7 additions and 3 deletions
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10
lib/Transforms/Scalar/GVN.cpp
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@ -728,7 +728,7 @@ namespace {
bool processNonLocalLoad(LoadInst* L,
SmallVectorImpl<Instruction*> &toErase);
bool processBlock(DomTreeNode* DTN);
Value *GetValueForBlock(BasicBlock *BB, LoadInst* orig,
Value *GetValueForBlock(BasicBlock *BB, Instruction* orig,
DenseMap<BasicBlock*, Value*> &Phis,
bool top_level = false);
void dump(DenseMap<uint32_t, Value*>& d);
@ -789,7 +789,7 @@ bool GVN::isSafeReplacement(PHINode* p, Instruction* inst) {
/// GetValueForBlock - Get the value to use within the specified basic block.
/// available values are in Phis.
Value *GVN::GetValueForBlock(BasicBlock *BB, LoadInst* orig,
Value *GVN::GetValueForBlock(BasicBlock *BB, Instruction* orig,
DenseMap<BasicBlock*, Value*> &Phis,
bool top_level) {
@ -837,7 +837,11 @@ Value *GVN::GetValueForBlock(BasicBlock *BB, LoadInst* orig,
Value* v = CollapsePhi(PN);
if (!v) {
// Cache our phi construction results
phiMap[orig->getPointerOperand()].insert(PN);
if (LoadInst* L = dyn_cast<LoadInst>(orig))
phiMap[L->getPointerOperand()].insert(PN);
else
phiMap[orig].insert(PN);
return PN;
}