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Volatile loads and stores depend on each other.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38502 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2007-07-10 18:11:42 +00:00
parent 13ab020ea0
commit e314eb3255
1 changed files with 17 additions and 0 deletions
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17
lib/Analysis/MemoryDependenceAnalysis.cpp
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@ -121,12 +121,15 @@ Instruction* MemoryDependenceAnalysis::getDependency(Instruction* query,
// Get the pointer value for which dependence will be determined
Value* dependee = 0;
uint64_t dependeeSize = 0;
bool queryIsVolatile = false;
if (StoreInst* S = dyn_cast<StoreInst>(QI)) {
dependee = S->getPointerOperand();
dependeeSize = TD.getTypeSize(S->getOperand(0)->getType());
queryIsVolatile = S->isVolatile();
} else if (LoadInst* L = dyn_cast<LoadInst>(QI)) {
dependee = L->getPointerOperand();
dependeeSize = TD.getTypeSize(L->getType());
queryIsVolatile = L->isVolatile();
} else if (FreeInst* F = dyn_cast<FreeInst>(QI)) {
dependee = F->getPointerOperand();
@ -148,9 +151,23 @@ Instruction* MemoryDependenceAnalysis::getDependency(Instruction* query,
Value* pointer = 0;
uint64_t pointerSize = 0;
if (StoreInst* S = dyn_cast<StoreInst>(QI)) {
// All volatile loads/stores depend on each other
if (queryIsVolatile && S->isVolatile()) {
depGraphLocal.insert(std::make_pair(query, std::make_pair(S, true)));
reverseDep.insert(std::make_pair(S, query));
return S;
}
pointer = S->getPointerOperand();
pointerSize = TD.getTypeSize(S->getOperand(0)->getType());
} else if (LoadInst* L = dyn_cast<LoadInst>(QI)) {
// All volatile loads/stores depend on each other
if (queryIsVolatile && L->isVolatile()) {
depGraphLocal.insert(std::make_pair(query, std::make_pair(L, true)));
reverseDep.insert(std::make_pair(L, query));
return L;
}
pointer = L->getPointerOperand();
pointerSize = TD.getTypeSize(L->getType());
} else if (AllocationInst* AI = dyn_cast<AllocationInst>(QI)) {