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Make the condition-checking for free with non-trivial dependencies more correct.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@39789 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2007-07-12 18:08:51 +00:00
parent 1b4542b6df
commit dd61c2b25c
1 changed files with 19 additions and 7 deletions
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26
lib/Transforms/Scalar/FastDSE.cpp
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@ -46,9 +46,8 @@ namespace {
}
bool runOnBasicBlock(BasicBlock &BB);
bool handleFreeWithNonTrivialDependency(FreeInst* F, StoreInst* dependency,
bool handleFreeWithNonTrivialDependency(FreeInst* F, Instruction* dependency,
SetVector<Instruction*>& possiblyDead);
bool handleEndBlock(BasicBlock& BB, SetVector<Instruction*>& possiblyDead);
void DeleteDeadInstructionChains(Instruction *I,
SetVector<Instruction*> &DeadInsts);
@ -91,6 +90,7 @@ bool FDSE::runOnBasicBlock(BasicBlock &BB) {
assert(pointer && "Not a free or a store?");
StoreInst*& last = lastStore[pointer];
bool deletedStore = false;
// ... to a pointer that has been stored to before...
if (last) {
@ -107,13 +107,17 @@ bool FDSE::runOnBasicBlock(BasicBlock &BB) {
last->eraseFromParent();
NumFastStores++;
deletedStore = true;
MadeChange = true;
// If this is a free, check for a non-trivial dependency
} else if (FreeInst* F = dyn_cast<FreeInst>(BBI))
MadeChange |= handleFreeWithNonTrivialDependency(F, last, possiblyDead);
}
}
// Handle frees whose dependencies are non-trivial
if (FreeInst* F = dyn_cast<FreeInst>(BBI))
if (!deletedStore)
MadeChange |= handleFreeWithNonTrivialDependency(F, MD.getDependency(F),
possiblyDead);
// Update our most-recent-store map
if (StoreInst* S = dyn_cast<StoreInst>(BBI))
last = S;
@ -134,12 +138,20 @@ bool FDSE::runOnBasicBlock(BasicBlock &BB) {
/// handleFreeWithNonTrivialDependency - Handle frees of entire structures whose
/// dependency is a store to a field of that structure
bool FDSE::handleFreeWithNonTrivialDependency(FreeInst* F, StoreInst* dependency,
bool FDSE::handleFreeWithNonTrivialDependency(FreeInst* F, Instruction* dep,
SetVector<Instruction*>& possiblyDead) {
TargetData &TD = getAnalysis<TargetData>();
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
MemoryDependenceAnalysis& MD = getAnalysis<MemoryDependenceAnalysis>();
if (dep == MemoryDependenceAnalysis::None ||
dep == MemoryDependenceAnalysis::NonLocal)
return false;
StoreInst* dependency = dyn_cast<StoreInst>(dep);
if (!dependency)
return false;
Value* depPointer = dependency->getPointerOperand();
unsigned depPointerSize = TD.getTypeSize(dependency->getOperand(0)->getType());