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calls never depend on allocations.

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llvm-svn: 60268
This commit is contained in:
Chris Lattner 2008-11-30 01:44:00 +00:00
parent 2f7da36732
commit 2e3c1d37d9
1 changed files with 5 additions and 12 deletions
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17
lib/Analysis/MemoryDependenceAnalysis.cpp
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@ -63,15 +63,6 @@ getCallSiteDependency(CallSite C, BasicBlock::iterator ScanIt,
if (StoreInst *S = dyn_cast<StoreInst>(Inst)) {
Pointer = S->getPointerOperand();
PointerSize = TD.getTypeStoreSize(S->getOperand(0)->getType());
} else if (AllocationInst *AI = dyn_cast<AllocationInst>(Inst)) {
Pointer = AI;
if (ConstantInt *C = dyn_cast<ConstantInt>(AI->getArraySize()))
// Use ABI size (size between elements), not store size (size of one
// element without padding).
PointerSize = C->getZExtValue() *
TD.getABITypeSize(AI->getAllocatedType());
else
PointerSize = ~0UL;
} else if (VAArgInst *V = dyn_cast<VAArgInst>(Inst)) {
Pointer = V->getOperand(0);
PointerSize = TD.getTypeStoreSize(V->getType());
@ -85,8 +76,10 @@ getCallSiteDependency(CallSite C, BasicBlock::iterator ScanIt,
AliasAnalysis::DoesNotAccessMemory)
continue;
return DepResultTy(Inst, Normal);
} else
} else {
// Non-memory instruction.
continue;
}
if (AA.getModRefInfo(C, Pointer, PointerSize) != AliasAnalysis::NoModRef)
return DepResultTy(Inst, Normal);
@ -141,8 +134,8 @@ getDependencyFromInternal(Instruction *QueryInst, BasicBlock::iterator ScanIt,
(isa<StoreInst>(Inst) && cast<StoreInst>(Inst)->isVolatile())))
return DepResultTy(Inst, Normal);
// MemDep is broken w.r.t. loads: it says that two loads of the same pointer
// depend on each other. :(
// Values depend on loads if the pointers are must aliased. This means that
// a load depends on another must aliased load from the same value.
if (LoadInst *L = dyn_cast<LoadInst>(Inst)) {
Value *Pointer = L->getPointerOperand();
uint64_t PointerSize = TD.getTypeStoreSize(L->getType());