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Allow GVN to eliminate read-only function calls when it can detect that they are redundant.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44323 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2007-11-26 02:26:36 +00:00
parent fd94dd58ff
commit 00a6d1448d
3 changed files with 24 additions and 6 deletions
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9
lib/Analysis/MemoryDependenceAnalysis.cpp
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@ -79,9 +79,6 @@ Instruction* MemoryDependenceAnalysis::getCallSiteDependency(CallSite C,
if (StoreInst* S = dyn_cast<StoreInst>(QI)) {
pointer = S->getPointerOperand();
pointerSize = TD.getTypeStoreSize(S->getOperand(0)->getType());
} else if (LoadInst* L = dyn_cast<LoadInst>(QI)) {
pointer = L->getPointerOperand();
pointerSize = TD.getTypeStoreSize(L->getType());
} else if (AllocationInst* AI = dyn_cast<AllocationInst>(QI)) {
pointer = AI;
if (ConstantInt* C = dyn_cast<ConstantInt>(AI->getArraySize()))
@ -98,7 +95,11 @@ Instruction* MemoryDependenceAnalysis::getCallSiteDependency(CallSite C,
// FreeInsts erase the entire structure
pointerSize = ~0UL;
} else if (CallSite::get(QI).getInstruction() != 0) {
if (AA.getModRefInfo(C, CallSite::get(QI)) != AliasAnalysis::NoModRef) {
AliasAnalysis::ModRefBehavior result =
AA.getModRefBehavior(cast<CallInst>(QI)->getCalledFunction(),
CallSite::get(QI));
if (result != AliasAnalysis::DoesNotAccessMemory &&
result != AliasAnalysis::OnlyReadsMemory) {
if (!start && !block) {
depGraphLocal.insert(std::make_pair(C.getInstruction(),
std::make_pair(QI, true)));