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This needs proper dominance

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24410 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-11-18 07:29:44 +00:00
parent 4b5086cc71
commit fed40df846
1 changed files with 14 additions and 5 deletions
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19
lib/Transforms/Utils/PromoteMemoryToRegister.cpp
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@ -96,12 +96,18 @@ namespace {
void run();
/// dominates - Return true if I1 dominates I2 using the DominatorTree.
/// properlyDominates - Return true if I1 properly dominates I2.
///
bool dominates(Instruction *I1, Instruction *I2) const {
bool properlyDominates(Instruction *I1, Instruction *I2) const {
if (InvokeInst *II = dyn_cast<InvokeInst>(I1))
I1 = II->getNormalDest()->begin();
return DT[I1->getParent()]->dominates(DT[I2->getParent()]);
return DT[I1->getParent()]->properlyDominates(DT[I2->getParent()]);
}
/// dominates - Return true if BB1 dominates BB2 using the DominatorTree.
///
bool dominates(BasicBlock *BB1, BasicBlock *BB2) const {
return DT[BB1]->dominates(DT[BB2]);
}
private:
@ -168,7 +174,8 @@ void PromoteMem2Reg::run() {
// Remember the basic blocks which define new values for the alloca
DefiningBlocks.push_back(SI->getParent());
AllocaPointerVal = SI->getOperand(0);
} else if (LoadInst *LI = dyn_cast<LoadInst>(User)) {
} else {
LoadInst *LI = cast<LoadInst>(User);
// Otherwise it must be a load instruction, keep track of variable reads
UsingBlocks.push_back(LI->getParent());
AllocaPointerVal = LI;
@ -194,6 +201,7 @@ void PromoteMem2Reg::run() {
continue;
}
if (AST)
PointerAllocaValues[AllocaNum] = AllocaPointerVal;
@ -348,7 +356,8 @@ void PromoteMem2Reg::run() {
for (unsigned i = 0, e = PNs.size(); i != e; ++i)
if (PNs[i]) {
if (Value *V = PNs[i]->hasConstantValue(true)) {
if (!isa<Instruction>(V) || dominates(cast<Instruction>(V), PNs[i])) {
if (!isa<Instruction>(V) ||
properlyDominates(cast<Instruction>(V), PNs[i])) {
if (AST && isa<PointerType>(PNs[i]->getType()))
AST->deleteValue(PNs[i]);
PNs[i]->replaceAllUsesWith(V);