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Struct-path aware TBAA: update getMostGenericTBAA

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The tag is of type TBAANode when flag EnableStructPathTBAA is off.

Move implementation of MDNode::getMostGenericTBAA to TypeBasedAliasAnalysis.cpp
since it depends on how to interprete the MDNodes for scalar TBAA and
struct-path aware TBAA.

llvm-svn: 180068
This commit is contained in:
Manman Ren 2013-04-22 23:00:44 +00:00
parent face3ce082
commit 8fd556f742
2 changed files with 60 additions and 38 deletions
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62
lib/Analysis/TypeBasedAliasAnalysis.cpp
View File

@ -376,7 +376,7 @@ bool TypeBasedAliasAnalysis::pointsToConstantMemory(const Location &Loc,
// If this is an "immutable" type, we can assume the pointer is pointing
// to constant memory.
if (TBAANode(M).TypeIsImmutable())
if (!EnableStructPathTBAA && TBAANode(M).TypeIsImmutable())
return true;
return AliasAnalysis::pointsToConstantMemory(Loc, OrLocal);
@ -392,7 +392,7 @@ TypeBasedAliasAnalysis::getModRefBehavior(ImmutableCallSite CS) {
// If this is an "immutable" type, we can assume the call doesn't write
// to memory.
if (const MDNode *M = CS.getInstruction()->getMetadata(LLVMContext::MD_tbaa))
if (TBAANode(M).TypeIsImmutable())
if (!EnableStructPathTBAA && TBAANode(M).TypeIsImmutable())
Min = OnlyReadsMemory;
return ModRefBehavior(AliasAnalysis::getModRefBehavior(CS) & Min);
@ -434,3 +434,61 @@ TypeBasedAliasAnalysis::getModRefInfo(ImmutableCallSite CS1,
return AliasAnalysis::getModRefInfo(CS1, CS2);
}
MDNode *MDNode::getMostGenericTBAA(MDNode *A, MDNode *B) {
if (!A || !B)
return NULL;
if (A == B)
return A;
// For struct-path aware TBAA, we use the access type of the tag.
if (EnableStructPathTBAA) {
A = cast_or_null<MDNode>(A->getOperand(1));
if (!A) return 0;
B = cast_or_null<MDNode>(B->getOperand(1));
if (!B) return 0;
}
SmallVector<MDNode *, 4> PathA;
MDNode *T = A;
while (T) {
PathA.push_back(T);
if (EnableStructPathTBAA)
T = T->getNumOperands() >= 3 ? cast_or_null<MDNode>(T->getOperand(2)) : 0;
else
T = T->getNumOperands() >= 2 ? cast_or_null<MDNode>(T->getOperand(1)) : 0;
}
SmallVector<MDNode *, 4> PathB;
T = B;
while (T) {
PathB.push_back(T);
if (EnableStructPathTBAA)
T = T->getNumOperands() >= 3 ? cast_or_null<MDNode>(T->getOperand(2)) : 0;
else
T = T->getNumOperands() >= 2 ? cast_or_null<MDNode>(T->getOperand(1)) : 0;
}
int IA = PathA.size() - 1;
int IB = PathB.size() - 1;
MDNode *Ret = 0;
while (IA >= 0 && IB >=0) {
if (PathA[IA] == PathB[IB])
Ret = PathA[IA];
else
break;
--IA;
--IB;
}
if (!EnableStructPathTBAA)
return Ret;
if (!Ret)
return 0;
// We need to convert from a type node to a tag node.
Type *Int64 = IntegerType::get(A->getContext(), 64);
Value *Ops[3] = { Ret, Ret, ConstantInt::get(Int64, 0) };
return MDNode::get(A->getContext(), Ops);
}

36
lib/IR/Metadata.cpp
View File

@ -403,42 +403,6 @@ void MDNode::replaceOperand(MDNodeOperand *Op, Value *To) {
}
}
MDNode *MDNode::getMostGenericTBAA(MDNode *A, MDNode *B) {
if (!A || !B)
return NULL;
if (A == B)
return A;
SmallVector<MDNode *, 4> PathA;
MDNode *T = A;
while (T) {
PathA.push_back(T);
T = T->getNumOperands() >= 2 ? cast_or_null<MDNode>(T->getOperand(1)) : 0;
}
SmallVector<MDNode *, 4> PathB;
T = B;
while (T) {
PathB.push_back(T);
T = T->getNumOperands() >= 2 ? cast_or_null<MDNode>(T->getOperand(1)) : 0;
}
int IA = PathA.size() - 1;
int IB = PathB.size() - 1;
MDNode *Ret = 0;
while (IA >= 0 && IB >=0) {
if (PathA[IA] == PathB[IB])
Ret = PathA[IA];
else
break;
--IA;
--IB;
}
return Ret;
}
MDNode *MDNode::getMostGenericFPMath(MDNode *A, MDNode *B) {
if (!A || !B)
return NULL;