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Aliasing rules for struct-path aware TBAA.
Added PathAliases to check if two struct-path tags can alias. Added command line option -struct-path-tbaa. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179337 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren
parent
adb5c16aa7
commit
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@ -71,6 +71,7 @@ using namespace llvm;
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// achieved by stripping the !tbaa tags from IR, but this option is sometimes
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// more convenient.
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static cl::opt<bool> EnableTBAA("enable-tbaa", cl::init(true));
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static cl::opt<bool> EnableStructPathTBAA("struct-path-tbaa", cl::init(false));
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namespace {
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/// TBAANode - This is a simple wrapper around an MDNode which provides a
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@ -109,6 +110,76 @@ namespace {
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return CI->getValue()[0];
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}
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};
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/// This is a simple wrapper around an MDNode which provides a
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/// higher-level interface by hiding the details of how alias analysis
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/// information is encoded in its operands.
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class TBAAStructTagNode {
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/// This node should be created with createTBAAStructTagNode.
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const MDNode *Node;
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public:
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TBAAStructTagNode() : Node(0) {}
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explicit TBAAStructTagNode(const MDNode *N) : Node(N) {}
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/// Get the MDNode for this TBAAStructTagNode.
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const MDNode *getNode() const { return Node; }
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const MDNode *getBaseType() const {
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return dyn_cast_or_null<MDNode>(Node->getOperand(0));
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}
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const MDNode *getAccessType() const {
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return dyn_cast_or_null<MDNode>(Node->getOperand(1));
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}
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uint64_t getOffset() const {
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return cast<ConstantInt>(Node->getOperand(2))->getZExtValue();
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}
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};
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/// This is a simple wrapper around an MDNode which provides a
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/// higher-level interface by hiding the details of how alias analysis
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/// information is encoded in its operands.
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class TBAAStructTypeNode {
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/// This node should be created with createTBAAStructTypeNode.
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const MDNode *Node;
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public:
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TBAAStructTypeNode() : Node(0) {}
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explicit TBAAStructTypeNode(const MDNode *N) : Node(N) {}
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/// Get the MDNode for this TBAAStructTypeNode.
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const MDNode *getNode() const { return Node; }
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/// Get this TBAAStructTypeNode's field in the type DAG with
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/// given offset. Update the offset to be relative to the field type.
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TBAAStructTypeNode getParent(uint64_t &Offset) const {
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if (Node->getNumOperands() < 2)
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return TBAAStructTypeNode();
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// Assume the offsets are in order. We return the previous field if
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// the current offset is bigger than the given offset.
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unsigned TheIdx = 0;
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for (unsigned Idx = 1; Idx < Node->getNumOperands(); Idx += 2) {
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uint64_t Cur = cast<ConstantInt>(Node->getOperand(Idx))->getZExtValue();
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if (Cur > Offset) {
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assert(Idx >= 3 &&
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"TBAAStructTypeNode::getParent should have an offset match!");
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TheIdx = Idx - 2;
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break;
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}
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}
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// Move along the last field.
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if (TheIdx == 0)
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TheIdx = Node->getNumOperands() - 2;
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uint64_t Cur = cast<ConstantInt>(Node->getOperand(TheIdx))->
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getZExtValue();
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Offset -= Cur;
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MDNode *P = dyn_cast_or_null<MDNode>(Node->getOperand(TheIdx + 1));
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if (!P)
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return TBAAStructTypeNode();
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return TBAAStructTypeNode(P);
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}
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};
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}
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namespace {
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@ -137,6 +208,7 @@ namespace {
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}
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bool Aliases(const MDNode *A, const MDNode *B) const;
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bool PathAliases(const MDNode *A, const MDNode *B) const;
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private:
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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@ -171,6 +243,9 @@ TypeBasedAliasAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
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bool
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TypeBasedAliasAnalysis::Aliases(const MDNode *A,
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const MDNode *B) const {
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if (EnableStructPathTBAA)
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return PathAliases(A, B);
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// Keep track of the root node for A and B.
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TBAANode RootA, RootB;
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@ -209,6 +284,67 @@ TypeBasedAliasAnalysis::Aliases(const MDNode *A,
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return false;
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}
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/// Test whether the struct-path tag represented by A may alias the
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/// struct-path tag represented by B.
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bool
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TypeBasedAliasAnalysis::PathAliases(const MDNode *A,
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const MDNode *B) const {
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// Keep track of the root node for A and B.
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TBAAStructTypeNode RootA, RootB;
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TBAAStructTagNode TagA(A), TagB(B);
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// TODO: We need to check if AccessType of TagA encloses AccessType of
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// TagB to support aggregate AccessType. If yes, return true.
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// Start from the base type of A, follow the edge with the correct offset in
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// the type DAG and adjust the offset until we reach the base type of B or
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// until we reach the Root node.
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// Compare the adjusted offset once we have the same base.
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// Climb the type DAG from base type of A to see if we reach base type of B.
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const MDNode *BaseA = TagA.getBaseType();
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const MDNode *BaseB = TagB.getBaseType();
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uint64_t OffsetA = TagA.getOffset(), OffsetB = TagB.getOffset();
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for (TBAAStructTypeNode T(BaseA); ; ) {
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if (T.getNode() == BaseB)
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// Base type of A encloses base type of B, check if the offsets match.
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return OffsetA == OffsetB;
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RootA = T;
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// Follow the edge with the correct offset, OffsetA will be adjusted to
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// be relative to the field type.
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T = T.getParent(OffsetA);
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if (!T.getNode())
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break;
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}
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// Reset OffsetA and climb the type DAG from base type of B to see if we reach
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// base type of A.
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OffsetA = TagA.getOffset();
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for (TBAAStructTypeNode T(BaseB); ; ) {
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if (T.getNode() == BaseA)
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// Base type of B encloses base type of A, check if the offsets match.
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return OffsetA == OffsetB;
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RootB = T;
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// Follow the edge with the correct offset, OffsetB will be adjusted to
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// be relative to the field type.
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T = T.getParent(OffsetB);
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if (!T.getNode())
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break;
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}
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// Neither node is an ancestor of the other.
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// If they have different roots, they're part of different potentially
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// unrelated type systems, so we must be conservative.
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if (RootA.getNode() != RootB.getNode())
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return true;
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// If they have the same root, then we've proved there's no alias.
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return false;
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}
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AliasAnalysis::AliasResult
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TypeBasedAliasAnalysis::alias(const Location &LocA,
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const Location &LocB) {
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392
test/Analysis/TypeBasedAliasAnalysis/tbaa-path.ll
Normal file
392
test/Analysis/TypeBasedAliasAnalysis/tbaa-path.ll
Normal file
@ -0,0 +1,392 @@
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; RUN: opt < %s -tbaa -basicaa -struct-path-tbaa -aa-eval -evaluate-tbaa -print-no-aliases -print-may-aliases -disable-output 2>&1 | FileCheck %s
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; RUN: opt < %s -tbaa -basicaa -struct-path-tbaa -gvn -S | FileCheck %s --check-prefix=OPT
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; Generated from clang/test/CodeGen/tbaa.cpp with "-O1 -struct-path-tbaa -disable-llvm-optzns".
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%struct.StructA = type { i16, i32, i16, i32 }
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%struct.StructB = type { i16, %struct.StructA, i32 }
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%struct.StructS = type { i16, i32 }
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%struct.StructS2 = type { i16, i32 }
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%struct.StructC = type { i16, %struct.StructB, i32 }
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%struct.StructD = type { i16, %struct.StructB, i32, i8 }
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define i32 @_Z1gPjP7StructAy(i32* %s, %struct.StructA* %A, i64 %count) #0 {
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entry:
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; Access to i32* and &(A->f32).
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; CHECK: Function
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; CHECK: MayAlias: store i32 4, i32* %f32, align 4, !tbaa !8 <-> store i32 1, i32* %0, align 4, !tbaa !6
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; OPT: define
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; OPT: store i32 1
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; OPT: store i32 4
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; OPT: %[[RET:.*]] = load i32*
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; OPT: ret i32 %[[RET]]
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%s.addr = alloca i32*, align 8
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%A.addr = alloca %struct.StructA*, align 8
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%count.addr = alloca i64, align 8
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store i32* %s, i32** %s.addr, align 8, !tbaa !0
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store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
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store i64 %count, i64* %count.addr, align 8, !tbaa !4
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%0 = load i32** %s.addr, align 8, !tbaa !0
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store i32 1, i32* %0, align 4, !tbaa !6
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%1 = load %struct.StructA** %A.addr, align 8, !tbaa !0
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%f32 = getelementptr inbounds %struct.StructA* %1, i32 0, i32 1
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store i32 4, i32* %f32, align 4, !tbaa !8
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%2 = load i32** %s.addr, align 8, !tbaa !0
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%3 = load i32* %2, align 4, !tbaa !6
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ret i32 %3
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}
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define i32 @_Z2g2PjP7StructAy(i32* %s, %struct.StructA* %A, i64 %count) #0 {
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entry:
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; Access to i32* and &(A->f16).
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; CHECK: Function
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; CHECK: NoAlias: store i16 4, i16* %f16, align 2, !tbaa !8 <-> store i32 1, i32* %0, align 4, !tbaa !6
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; OPT: define
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; OPT: store i32 1
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; OPT: store i16 4
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; Remove a load and propogate the value from store.
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; OPT: ret i32 1
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%s.addr = alloca i32*, align 8
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%A.addr = alloca %struct.StructA*, align 8
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%count.addr = alloca i64, align 8
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store i32* %s, i32** %s.addr, align 8, !tbaa !0
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store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
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store i64 %count, i64* %count.addr, align 8, !tbaa !4
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%0 = load i32** %s.addr, align 8, !tbaa !0
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store i32 1, i32* %0, align 4, !tbaa !6
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%1 = load %struct.StructA** %A.addr, align 8, !tbaa !0
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%f16 = getelementptr inbounds %struct.StructA* %1, i32 0, i32 0
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store i16 4, i16* %f16, align 2, !tbaa !11
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%2 = load i32** %s.addr, align 8, !tbaa !0
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%3 = load i32* %2, align 4, !tbaa !6
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ret i32 %3
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}
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define i32 @_Z2g3P7StructAP7StructBy(%struct.StructA* %A, %struct.StructB* %B, i64 %count) #0 {
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entry:
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; Access to &(A->f32) and &(B->a.f32).
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; CHECK: Function
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; CHECK: MayAlias: store i32 4, i32* %f321, align 4, !tbaa !10 <-> store i32 1, i32* %f32, align 4, !tbaa !6
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; OPT: define
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; OPT: store i32 1
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; OPT: store i32 4
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; OPT: %[[RET:.*]] = load i32*
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; OPT: ret i32 %[[RET]]
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%A.addr = alloca %struct.StructA*, align 8
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%B.addr = alloca %struct.StructB*, align 8
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%count.addr = alloca i64, align 8
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store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
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store %struct.StructB* %B, %struct.StructB** %B.addr, align 8, !tbaa !0
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store i64 %count, i64* %count.addr, align 8, !tbaa !4
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%0 = load %struct.StructA** %A.addr, align 8, !tbaa !0
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%f32 = getelementptr inbounds %struct.StructA* %0, i32 0, i32 1
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store i32 1, i32* %f32, align 4, !tbaa !8
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%1 = load %struct.StructB** %B.addr, align 8, !tbaa !0
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%a = getelementptr inbounds %struct.StructB* %1, i32 0, i32 1
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%f321 = getelementptr inbounds %struct.StructA* %a, i32 0, i32 1
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store i32 4, i32* %f321, align 4, !tbaa !12
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%2 = load %struct.StructA** %A.addr, align 8, !tbaa !0
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%f322 = getelementptr inbounds %struct.StructA* %2, i32 0, i32 1
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%3 = load i32* %f322, align 4, !tbaa !8
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ret i32 %3
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}
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define i32 @_Z2g4P7StructAP7StructBy(%struct.StructA* %A, %struct.StructB* %B, i64 %count) #0 {
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entry:
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; Access to &(A->f32) and &(B->a.f16).
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; CHECK: Function
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; CHECK: NoAlias: store i16 4, i16* %f16, align 2, !tbaa !10 <-> store i32 1, i32* %f32, align 4, !tbaa !6
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; OPT: define
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; OPT: store i32 1
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; OPT: store i16 4
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; Remove a load and propogate the value from store.
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; OPT: ret i32 1
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%A.addr = alloca %struct.StructA*, align 8
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%B.addr = alloca %struct.StructB*, align 8
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%count.addr = alloca i64, align 8
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store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
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store %struct.StructB* %B, %struct.StructB** %B.addr, align 8, !tbaa !0
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store i64 %count, i64* %count.addr, align 8, !tbaa !4
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%0 = load %struct.StructA** %A.addr, align 8, !tbaa !0
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%f32 = getelementptr inbounds %struct.StructA* %0, i32 0, i32 1
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store i32 1, i32* %f32, align 4, !tbaa !8
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%1 = load %struct.StructB** %B.addr, align 8, !tbaa !0
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%a = getelementptr inbounds %struct.StructB* %1, i32 0, i32 1
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%f16 = getelementptr inbounds %struct.StructA* %a, i32 0, i32 0
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store i16 4, i16* %f16, align 2, !tbaa !14
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%2 = load %struct.StructA** %A.addr, align 8, !tbaa !0
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%f321 = getelementptr inbounds %struct.StructA* %2, i32 0, i32 1
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%3 = load i32* %f321, align 4, !tbaa !8
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ret i32 %3
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}
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define i32 @_Z2g5P7StructAP7StructBy(%struct.StructA* %A, %struct.StructB* %B, i64 %count) #0 {
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entry:
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; Access to &(A->f32) and &(B->f32).
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; CHECK: Function
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; CHECK: NoAlias: store i32 4, i32* %f321, align 4, !tbaa !10 <-> store i32 1, i32* %f32, align 4, !tbaa !6
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; OPT: define
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; OPT: store i32 1
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; OPT: store i32 4
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; Remove a load and propogate the value from store.
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; OPT: ret i32 1
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%A.addr = alloca %struct.StructA*, align 8
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%B.addr = alloca %struct.StructB*, align 8
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%count.addr = alloca i64, align 8
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store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
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store %struct.StructB* %B, %struct.StructB** %B.addr, align 8, !tbaa !0
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store i64 %count, i64* %count.addr, align 8, !tbaa !4
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%0 = load %struct.StructA** %A.addr, align 8, !tbaa !0
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%f32 = getelementptr inbounds %struct.StructA* %0, i32 0, i32 1
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store i32 1, i32* %f32, align 4, !tbaa !8
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%1 = load %struct.StructB** %B.addr, align 8, !tbaa !0
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%f321 = getelementptr inbounds %struct.StructB* %1, i32 0, i32 2
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store i32 4, i32* %f321, align 4, !tbaa !15
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%2 = load %struct.StructA** %A.addr, align 8, !tbaa !0
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%f322 = getelementptr inbounds %struct.StructA* %2, i32 0, i32 1
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%3 = load i32* %f322, align 4, !tbaa !8
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ret i32 %3
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}
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define i32 @_Z2g6P7StructAP7StructBy(%struct.StructA* %A, %struct.StructB* %B, i64 %count) #0 {
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entry:
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; Access to &(A->f32) and &(B->a.f32_2).
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; CHECK: Function
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; CHECK: NoAlias: store i32 4, i32* %f32_2, align 4, !tbaa !10 <-> store i32 1, i32* %f32, align 4, !tbaa !6
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; OPT: define
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; OPT: store i32 1
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; OPT: store i32 4
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; Remove a load and propogate the value from store.
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; OPT: ret i32 1
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%A.addr = alloca %struct.StructA*, align 8
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%B.addr = alloca %struct.StructB*, align 8
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%count.addr = alloca i64, align 8
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store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
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store %struct.StructB* %B, %struct.StructB** %B.addr, align 8, !tbaa !0
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store i64 %count, i64* %count.addr, align 8, !tbaa !4
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%0 = load %struct.StructA** %A.addr, align 8, !tbaa !0
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%f32 = getelementptr inbounds %struct.StructA* %0, i32 0, i32 1
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store i32 1, i32* %f32, align 4, !tbaa !8
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%1 = load %struct.StructB** %B.addr, align 8, !tbaa !0
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%a = getelementptr inbounds %struct.StructB* %1, i32 0, i32 1
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%f32_2 = getelementptr inbounds %struct.StructA* %a, i32 0, i32 3
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store i32 4, i32* %f32_2, align 4, !tbaa !16
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%2 = load %struct.StructA** %A.addr, align 8, !tbaa !0
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%f321 = getelementptr inbounds %struct.StructA* %2, i32 0, i32 1
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%3 = load i32* %f321, align 4, !tbaa !8
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ret i32 %3
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}
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define i32 @_Z2g7P7StructAP7StructSy(%struct.StructA* %A, %struct.StructS* %S, i64 %count) #0 {
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entry:
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; Access to &(A->f32) and &(S->f32).
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; CHECK: Function
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; CHECK: NoAlias: store i32 4, i32* %f321, align 4, !tbaa !10 <-> store i32 1, i32* %f32, align 4, !tbaa !6
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; OPT: define
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; OPT: store i32 1
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; OPT: store i32 4
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; Remove a load and propogate the value from store.
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; OPT: ret i32 1
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%A.addr = alloca %struct.StructA*, align 8
|
||||
%S.addr = alloca %struct.StructS*, align 8
|
||||
%count.addr = alloca i64, align 8
|
||||
store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
|
||||
store %struct.StructS* %S, %struct.StructS** %S.addr, align 8, !tbaa !0
|
||||
store i64 %count, i64* %count.addr, align 8, !tbaa !4
|
||||
%0 = load %struct.StructA** %A.addr, align 8, !tbaa !0
|
||||
%f32 = getelementptr inbounds %struct.StructA* %0, i32 0, i32 1
|
||||
store i32 1, i32* %f32, align 4, !tbaa !8
|
||||
%1 = load %struct.StructS** %S.addr, align 8, !tbaa !0
|
||||
%f321 = getelementptr inbounds %struct.StructS* %1, i32 0, i32 1
|
||||
store i32 4, i32* %f321, align 4, !tbaa !17
|
||||
%2 = load %struct.StructA** %A.addr, align 8, !tbaa !0
|
||||
%f322 = getelementptr inbounds %struct.StructA* %2, i32 0, i32 1
|
||||
%3 = load i32* %f322, align 4, !tbaa !8
|
||||
ret i32 %3
|
||||
}
|
||||
|
||||
define i32 @_Z2g8P7StructAP7StructSy(%struct.StructA* %A, %struct.StructS* %S, i64 %count) #0 {
|
||||
entry:
|
||||
; Access to &(A->f32) and &(S->f16).
|
||||
; CHECK: Function
|
||||
; CHECK: NoAlias: store i16 4, i16* %f16, align 2, !tbaa !10 <-> store i32 1, i32* %f32, align 4, !tbaa !6
|
||||
; OPT: define
|
||||
; OPT: store i32 1
|
||||
; OPT: store i16 4
|
||||
; Remove a load and propogate the value from store.
|
||||
; OPT: ret i32 1
|
||||
%A.addr = alloca %struct.StructA*, align 8
|
||||
%S.addr = alloca %struct.StructS*, align 8
|
||||
%count.addr = alloca i64, align 8
|
||||
store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
|
||||
store %struct.StructS* %S, %struct.StructS** %S.addr, align 8, !tbaa !0
|
||||
store i64 %count, i64* %count.addr, align 8, !tbaa !4
|
||||
%0 = load %struct.StructA** %A.addr, align 8, !tbaa !0
|
||||
%f32 = getelementptr inbounds %struct.StructA* %0, i32 0, i32 1
|
||||
store i32 1, i32* %f32, align 4, !tbaa !8
|
||||
%1 = load %struct.StructS** %S.addr, align 8, !tbaa !0
|
||||
%f16 = getelementptr inbounds %struct.StructS* %1, i32 0, i32 0
|
||||
store i16 4, i16* %f16, align 2, !tbaa !19
|
||||
%2 = load %struct.StructA** %A.addr, align 8, !tbaa !0
|
||||
%f321 = getelementptr inbounds %struct.StructA* %2, i32 0, i32 1
|
||||
%3 = load i32* %f321, align 4, !tbaa !8
|
||||
ret i32 %3
|
||||
}
|
||||
|
||||
define i32 @_Z2g9P7StructSP8StructS2y(%struct.StructS* %S, %struct.StructS2* %S2, i64 %count) #0 {
|
||||
entry:
|
||||
; Access to &(S->f32) and &(S2->f32).
|
||||
; CHECK: Function
|
||||
; CHECK: NoAlias: store i32 4, i32* %f321, align 4, !tbaa !10 <-> store i32 1, i32* %f32, align 4, !tbaa !6
|
||||
; OPT: define
|
||||
; OPT: store i32 1
|
||||
; OPT: store i32 4
|
||||
; Remove a load and propogate the value from store.
|
||||
; OPT: ret i32 1
|
||||
%S.addr = alloca %struct.StructS*, align 8
|
||||
%S2.addr = alloca %struct.StructS2*, align 8
|
||||
%count.addr = alloca i64, align 8
|
||||
store %struct.StructS* %S, %struct.StructS** %S.addr, align 8, !tbaa !0
|
||||
store %struct.StructS2* %S2, %struct.StructS2** %S2.addr, align 8, !tbaa !0
|
||||
store i64 %count, i64* %count.addr, align 8, !tbaa !4
|
||||
%0 = load %struct.StructS** %S.addr, align 8, !tbaa !0
|
||||
%f32 = getelementptr inbounds %struct.StructS* %0, i32 0, i32 1
|
||||
store i32 1, i32* %f32, align 4, !tbaa !17
|
||||
%1 = load %struct.StructS2** %S2.addr, align 8, !tbaa !0
|
||||
%f321 = getelementptr inbounds %struct.StructS2* %1, i32 0, i32 1
|
||||
store i32 4, i32* %f321, align 4, !tbaa !20
|
||||
%2 = load %struct.StructS** %S.addr, align 8, !tbaa !0
|
||||
%f322 = getelementptr inbounds %struct.StructS* %2, i32 0, i32 1
|
||||
%3 = load i32* %f322, align 4, !tbaa !17
|
||||
ret i32 %3
|
||||
}
|
||||
|
||||
define i32 @_Z3g10P7StructSP8StructS2y(%struct.StructS* %S, %struct.StructS2* %S2, i64 %count) #0 {
|
||||
entry:
|
||||
; Access to &(S->f32) and &(S2->f16).
|
||||
; CHECK: Function
|
||||
; CHECK: NoAlias: store i16 4, i16* %f16, align 2, !tbaa !10 <-> store i32 1, i32* %f32, align 4, !tbaa !6
|
||||
; OPT: define
|
||||
; OPT: store i32 1
|
||||
; OPT: store i16 4
|
||||
; Remove a load and propogate the value from store.
|
||||
; OPT: ret i32 1
|
||||
%S.addr = alloca %struct.StructS*, align 8
|
||||
%S2.addr = alloca %struct.StructS2*, align 8
|
||||
%count.addr = alloca i64, align 8
|
||||
store %struct.StructS* %S, %struct.StructS** %S.addr, align 8, !tbaa !0
|
||||
store %struct.StructS2* %S2, %struct.StructS2** %S2.addr, align 8, !tbaa !0
|
||||
store i64 %count, i64* %count.addr, align 8, !tbaa !4
|
||||
%0 = load %struct.StructS** %S.addr, align 8, !tbaa !0
|
||||
%f32 = getelementptr inbounds %struct.StructS* %0, i32 0, i32 1
|
||||
store i32 1, i32* %f32, align 4, !tbaa !17
|
||||
%1 = load %struct.StructS2** %S2.addr, align 8, !tbaa !0
|
||||
%f16 = getelementptr inbounds %struct.StructS2* %1, i32 0, i32 0
|
||||
store i16 4, i16* %f16, align 2, !tbaa !22
|
||||
%2 = load %struct.StructS** %S.addr, align 8, !tbaa !0
|
||||
%f321 = getelementptr inbounds %struct.StructS* %2, i32 0, i32 1
|
||||
%3 = load i32* %f321, align 4, !tbaa !17
|
||||
ret i32 %3
|
||||
}
|
||||
|
||||
define i32 @_Z3g11P7StructCP7StructDy(%struct.StructC* %C, %struct.StructD* %D, i64 %count) #0 {
|
||||
entry:
|
||||
; Access to &(C->b.a.f32) and &(D->b.a.f32).
|
||||
; CHECK: Function
|
||||
; CHECK: NoAlias: store i32 4, i32* %f323, align 4, !tbaa !12 <-> store i32 1, i32* %f32, align 4, !tbaa !6
|
||||
; OPT: define
|
||||
; OPT: store i32 1
|
||||
; OPT: store i32 4
|
||||
; Remove a load and propogate the value from store.
|
||||
; OPT: ret i32 1
|
||||
%C.addr = alloca %struct.StructC*, align 8
|
||||
%D.addr = alloca %struct.StructD*, align 8
|
||||
%count.addr = alloca i64, align 8
|
||||
store %struct.StructC* %C, %struct.StructC** %C.addr, align 8, !tbaa !0
|
||||
store %struct.StructD* %D, %struct.StructD** %D.addr, align 8, !tbaa !0
|
||||
store i64 %count, i64* %count.addr, align 8, !tbaa !4
|
||||
%0 = load %struct.StructC** %C.addr, align 8, !tbaa !0
|
||||
%b = getelementptr inbounds %struct.StructC* %0, i32 0, i32 1
|
||||
%a = getelementptr inbounds %struct.StructB* %b, i32 0, i32 1
|
||||
%f32 = getelementptr inbounds %struct.StructA* %a, i32 0, i32 1
|
||||
store i32 1, i32* %f32, align 4, !tbaa !23
|
||||
%1 = load %struct.StructD** %D.addr, align 8, !tbaa !0
|
||||
%b1 = getelementptr inbounds %struct.StructD* %1, i32 0, i32 1
|
||||
%a2 = getelementptr inbounds %struct.StructB* %b1, i32 0, i32 1
|
||||
%f323 = getelementptr inbounds %struct.StructA* %a2, i32 0, i32 1
|
||||
store i32 4, i32* %f323, align 4, !tbaa !25
|
||||
%2 = load %struct.StructC** %C.addr, align 8, !tbaa !0
|
||||
%b4 = getelementptr inbounds %struct.StructC* %2, i32 0, i32 1
|
||||
%a5 = getelementptr inbounds %struct.StructB* %b4, i32 0, i32 1
|
||||
%f326 = getelementptr inbounds %struct.StructA* %a5, i32 0, i32 1
|
||||
%3 = load i32* %f326, align 4, !tbaa !23
|
||||
ret i32 %3
|
||||
}
|
||||
|
||||
define i32 @_Z3g12P7StructCP7StructDy(%struct.StructC* %C, %struct.StructD* %D, i64 %count) #0 {
|
||||
entry:
|
||||
; Access to &(b1->a.f32) and &(b2->a.f32).
|
||||
; CHECK: Function
|
||||
; CHECK: MayAlias: store i32 4, i32* %f325, align 4, !tbaa !6 <-> store i32 1, i32* %f32, align 4, !tbaa !6
|
||||
; OPT: define
|
||||
; OPT: store i32 1
|
||||
; OPT: store i32 4
|
||||
; OPT: %[[RET:.*]] = load i32*
|
||||
; OPT: ret i32 %[[RET]]
|
||||
%C.addr = alloca %struct.StructC*, align 8
|
||||
%D.addr = alloca %struct.StructD*, align 8
|
||||
%count.addr = alloca i64, align 8
|
||||
%b1 = alloca %struct.StructB*, align 8
|
||||
%b2 = alloca %struct.StructB*, align 8
|
||||
store %struct.StructC* %C, %struct.StructC** %C.addr, align 8, !tbaa !0
|
||||
store %struct.StructD* %D, %struct.StructD** %D.addr, align 8, !tbaa !0
|
||||
store i64 %count, i64* %count.addr, align 8, !tbaa !4
|
||||
%0 = load %struct.StructC** %C.addr, align 8, !tbaa !0
|
||||
%b = getelementptr inbounds %struct.StructC* %0, i32 0, i32 1
|
||||
store %struct.StructB* %b, %struct.StructB** %b1, align 8, !tbaa !0
|
||||
%1 = load %struct.StructD** %D.addr, align 8, !tbaa !0
|
||||
%b3 = getelementptr inbounds %struct.StructD* %1, i32 0, i32 1
|
||||
store %struct.StructB* %b3, %struct.StructB** %b2, align 8, !tbaa !0
|
||||
%2 = load %struct.StructB** %b1, align 8, !tbaa !0
|
||||
%a = getelementptr inbounds %struct.StructB* %2, i32 0, i32 1
|
||||
%f32 = getelementptr inbounds %struct.StructA* %a, i32 0, i32 1
|
||||
store i32 1, i32* %f32, align 4, !tbaa !12
|
||||
%3 = load %struct.StructB** %b2, align 8, !tbaa !0
|
||||
%a4 = getelementptr inbounds %struct.StructB* %3, i32 0, i32 1
|
||||
%f325 = getelementptr inbounds %struct.StructA* %a4, i32 0, i32 1
|
||||
store i32 4, i32* %f325, align 4, !tbaa !12
|
||||
%4 = load %struct.StructB** %b1, align 8, !tbaa !0
|
||||
%a6 = getelementptr inbounds %struct.StructB* %4, i32 0, i32 1
|
||||
%f327 = getelementptr inbounds %struct.StructA* %a6, i32 0, i32 1
|
||||
%5 = load i32* %f327, align 4, !tbaa !12
|
||||
ret i32 %5
|
||||
}
|
||||
|
||||
attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-frame-pointer-elim-non-leaf"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
|
||||
|
||||
!0 = metadata !{metadata !1, metadata !1, i64 0}
|
||||
!1 = metadata !{metadata !"any pointer", i64 0, metadata !2}
|
||||
!2 = metadata !{metadata !"omnipotent char", i64 0, metadata !3}
|
||||
!3 = metadata !{metadata !"Simple C/C++ TBAA"}
|
||||
!4 = metadata !{metadata !5, metadata !5, i64 0}
|
||||
!5 = metadata !{metadata !"long long", i64 0, metadata !2}
|
||||
!6 = metadata !{metadata !7, metadata !7, i64 0}
|
||||
!7 = metadata !{metadata !"int", i64 0, metadata !2}
|
||||
!8 = metadata !{metadata !9, metadata !7, i64 4}
|
||||
!9 = metadata !{metadata !"_ZTS7StructA", i64 0, metadata !10, i64 4, metadata !7, i64 8, metadata !10, i64 12, metadata !7}
|
||||
!10 = metadata !{metadata !"short", i64 0, metadata !2}
|
||||
!11 = metadata !{metadata !9, metadata !10, i64 0}
|
||||
!12 = metadata !{metadata !13, metadata !7, i64 8}
|
||||
!13 = metadata !{metadata !"_ZTS7StructB", i64 0, metadata !10, i64 4, metadata !9, i64 20, metadata !7}
|
||||
!14 = metadata !{metadata !13, metadata !10, i64 4}
|
||||
!15 = metadata !{metadata !13, metadata !7, i64 20}
|
||||
!16 = metadata !{metadata !13, metadata !7, i64 16}
|
||||
!17 = metadata !{metadata !18, metadata !7, i64 4}
|
||||
!18 = metadata !{metadata !"_ZTS7StructS", i64 0, metadata !10, i64 4, metadata !7}
|
||||
!19 = metadata !{metadata !18, metadata !10, i64 0}
|
||||
!20 = metadata !{metadata !21, metadata !7, i64 4}
|
||||
!21 = metadata !{metadata !"_ZTS8StructS2", i64 0, metadata !10, i64 4, metadata !7}
|
||||
!22 = metadata !{metadata !21, metadata !10, i64 0}
|
||||
!23 = metadata !{metadata !24, metadata !7, i64 12}
|
||||
!24 = metadata !{metadata !"_ZTS7StructC", i64 0, metadata !10, i64 4, metadata !13, i64 28, metadata !7}
|
||||
!25 = metadata !{metadata !26, metadata !7, i64 12}
|
||||
!26 = metadata !{metadata !"_ZTS7StructD", i64 0, metadata !10, i64 4, metadata !13, i64 28, metadata !7, i64 32, metadata !2}
|
||||
Loading…
Reference in New Issue
Block a user