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Make the aliassettracker much more precise by actually tracking size

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information for various accesses.  What a concept.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5647 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-02-26 22:11:00 +00:00
parent cd4d41cd4f
commit 31a9d185bf
2 changed files with 53 additions and 33 deletions
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33
include/llvm/Analysis/AliasSetTracker.h
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@@ -29,12 +29,19 @@ class AliasSet {
class PointerRec {
HashNodePair *NextInList;
AliasSet *AS;
unsigned Size;
public:
PointerRec() : NextInList(0), AS(0) {}
PointerRec() : NextInList(0), AS(0), Size(0) {}
HashNodePair *getNext() const { return NextInList; }
bool hasAliasSet() const { return AS != 0; }
void updateSize(unsigned NewSize) {
if (NewSize > Size) Size = NewSize;
}
unsigned getSize() const { return Size; }
AliasSet *getAliasSet(AliasSetTracker &AST) {
assert(AS && "No AliasSet yet!");
if (AS->Forward) {
@@ -87,7 +94,7 @@ class AliasSet {
unsigned AliasTy : 1;
/// Define an iterator for alias sets... this is just a forward iterator.
class iterator : public forward_iterator<Value*, ptrdiff_t> {
class iterator : public forward_iterator<HashNodePair, ptrdiff_t> {
HashNodePair *CurNode;
public:
iterator(HashNodePair *CN = 0) : CurNode(CN) {}
@@ -102,11 +109,11 @@ class AliasSet {
return *this;
}
value_type operator*() const {
value_type &operator*() const {
assert(CurNode && "Dereferencing AliasSet.end()!");
return CurNode->first;
return *CurNode;
}
value_type operator->() const { return operator*(); }
value_type *operator->() const { return &operator*(); }
iterator& operator++() { // Preincrement
assert(CurNode && "Advancing past AliasSet.end()!");
@@ -148,8 +155,8 @@ private:
AliasSet() : PtrListHead(0), PtrListTail(0), Forward(0), RefCount(0),
AccessTy(NoModRef), AliasTy(MustAlias) {
}
Value *getSomePointer() const {
return PtrListHead ? PtrListHead->first : 0;
HashNodePair *getSomePointer() const {
return PtrListHead ? PtrListHead : 0;
}
/// getForwardedTarget - Return the real alias set this represents. If this
@@ -170,13 +177,13 @@ private:
void removeFromTracker(AliasSetTracker &AST);
void addPointer(AliasSetTracker &AST, HashNodePair &Entry);
void addPointer(AliasSetTracker &AST, HashNodePair &Entry, unsigned Size);
void addCallSite(CallSite CS);
/// aliasesPointer - Return true if the specified pointer "may" (or must)
/// alias one of the members in the set.
///
bool aliasesPointer(const Value *Ptr, AliasAnalysis &AA) const;
bool aliasesPointer(const Value *Ptr, unsigned Size, AliasAnalysis &AA) const;
bool aliasesCallSite(CallSite CS, AliasAnalysis &AA) const;
};
@@ -219,7 +226,7 @@ public:
/// getAliasSetForPointer - Return the alias set that the specified pointer
/// lives in...
AliasSet &getAliasSetForPointer(Value *P);
AliasSet &getAliasSetForPointer(Value *P, unsigned Size);
/// getAliasAnalysis - Return the underlying alias analysis object used by
/// this tracker.
@@ -248,11 +255,11 @@ private:
AliasSet::PointerRec())).first;
}
void addPointer(Value *P, AliasSet::AccessType E) {
AliasSet &AS = getAliasSetForPointer(P);
void addPointer(Value *P, unsigned Size, AliasSet::AccessType E) {
AliasSet &AS = getAliasSetForPointer(P, Size);
AS.AccessTy |= E;
}
AliasSet *findAliasSetForPointer(const Value *Ptr);
AliasSet *findAliasSetForPointer(const Value *Ptr, unsigned Size);
AliasSet *findAliasSetForCallSite(CallSite CS);
};