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Banish global state from ScalarEvolution! SCEV uniquing is now done by tables attached to the ScalarEvolution pass.

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This also throws out the SCEV reference counting scheme, as the the SCEVs now have a lifetime controlled by the
ScalarEvolution pass.

Note that SCEVHandle is now a no-op, and will be remove in a future commit.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73892 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2009-06-22 18:25:46 +00:00
parent 75d6ffd53f
commit 08367b6163
3 changed files with 79 additions and 89 deletions
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48
include/llvm/Analysis/ScalarEvolution.h
View File

@ -35,6 +35,14 @@ namespace llvm {
class SCEVHandle;
class ScalarEvolution;
class TargetData;
class SCEVConstant;
class SCEVTruncateExpr;
class SCEVZeroExtendExpr;
class SCEVCommutativeExpr;
class SCEVUDivExpr;
class SCEVSignExtendExpr;
class SCEVAddRecExpr;
class SCEVUnknown;
template<> struct DenseMapInfo<SCEVHandle>;
/// SCEV - This class represents an analyzed expression in the program. These
@ -43,15 +51,9 @@ namespace llvm {
///
class SCEV {
const unsigned SCEVType; // The SCEV baseclass this node corresponds to
mutable unsigned RefCount;
friend class SCEVHandle;
friend class DenseMapInfo<SCEVHandle>;
void addRef() const { ++RefCount; }
void dropRef() const {
if (--RefCount == 0)
delete this;
}
const ScalarEvolution* parent;
@ -61,7 +63,7 @@ namespace llvm {
virtual ~SCEV();
public:
explicit SCEV(unsigned SCEVTy, const ScalarEvolution* p) :
SCEVType(SCEVTy), RefCount(0), parent(p) {}
SCEVType(SCEVTy), parent(p) {}
unsigned getSCEVType() const { return SCEVType; }
@ -159,12 +161,9 @@ namespace llvm {
public:
SCEVHandle(const SCEV *s) : S(s) {
assert(S && "Cannot create a handle to a null SCEV!");
S->addRef();
}
SCEVHandle(const SCEVHandle &RHS) : S(RHS.S) {
S->addRef();
}
~SCEVHandle() { S->dropRef(); }
SCEVHandle(const SCEVHandle &RHS) : S(RHS.S) { }
~SCEVHandle() { }
operator const SCEV*() const { return S; }
@ -176,18 +175,14 @@ namespace llvm {
const SCEVHandle &operator=(SCEV *RHS) {
if (S != RHS) {
S->dropRef();
S = RHS;
S->addRef();
}
return *this;
}
const SCEVHandle &operator=(const SCEVHandle &RHS) {
if (S != RHS.S) {
S->dropRef();
S = RHS.S;
S->addRef();
}
return *this;
}
@ -209,14 +204,10 @@ namespace llvm {
struct DenseMapInfo<SCEVHandle> {
static inline SCEVHandle getEmptyKey() {
static SCEVCouldNotCompute Empty(0);
if (Empty.RefCount == 0)
Empty.addRef();
return &Empty;
}
static inline SCEVHandle getTombstoneKey() {
static SCEVCouldNotCompute Tombstone(0);
if (Tombstone.RefCount == 0)
Tombstone.addRef();
return &Tombstone;
}
static unsigned getHashValue(const SCEVHandle &Val) {
@ -639,6 +630,23 @@ namespace llvm {
void print(std::ostream *OS, const Module* M = 0) const {
if (OS) print(*OS, M);
}
private:
// Uniquing tables.
std::map<ConstantInt*, SCEVConstant*> SCEVConstants;
std::map<std::pair<const SCEV*, const Type*>,
SCEVTruncateExpr*> SCEVTruncates;
std::map<std::pair<const SCEV*, const Type*>,
SCEVZeroExtendExpr*> SCEVZeroExtends;
std::map<std::pair<unsigned, std::vector<const SCEV*> >,
SCEVCommutativeExpr*> SCEVCommExprs;
std::map<std::pair<const SCEV*, const SCEV*>,
SCEVUDivExpr*> SCEVUDivs;
std::map<std::pair<const SCEV*, const Type*>,
SCEVSignExtendExpr*> SCEVSignExtends;
std::map<std::pair<const Loop *, std::vector<const SCEV*> >,
SCEVAddRecExpr*> SCEVAddRecExprs;
std::map<Value*, SCEVUnknown*> SCEVUnknowns;
};
}

12
include/llvm/Analysis/ScalarEvolutionExpressions.h
View File

@ -38,8 +38,6 @@ namespace llvm {
ConstantInt *V;
explicit SCEVConstant(ConstantInt *v, const ScalarEvolution* p) :
SCEV(scConstant, p), V(v) {}
virtual ~SCEVConstant();
public:
ConstantInt *getValue() const { return V; }
@ -116,7 +114,6 @@ namespace llvm {
SCEVTruncateExpr(const SCEVHandle &op, const Type *ty,
const ScalarEvolution* p);
virtual ~SCEVTruncateExpr();
public:
SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
@ -146,7 +143,6 @@ namespace llvm {
SCEVZeroExtendExpr(const SCEVHandle &op, const Type *ty,
const ScalarEvolution* p);
virtual ~SCEVZeroExtendExpr();
public:
SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
@ -176,7 +172,6 @@ namespace llvm {
SCEVSignExtendExpr(const SCEVHandle &op, const Type *ty,
const ScalarEvolution* p);
virtual ~SCEVSignExtendExpr();
public:
SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
@ -269,7 +264,6 @@ namespace llvm {
const SmallVectorImpl<SCEVHandle> &ops,
const ScalarEvolution* p)
: SCEVNAryExpr(T, ops, p) {}
~SCEVCommutativeExpr();
public:
SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
@ -345,7 +339,6 @@ namespace llvm {
const ScalarEvolution* p)
: SCEV(scUDivExpr, p), LHS(lhs), RHS(rhs) {}
virtual ~SCEVUDivExpr();
public:
const SCEVHandle &getLHS() const { return LHS; }
const SCEVHandle &getRHS() const { return RHS; }
@ -405,7 +398,6 @@ namespace llvm {
assert(Operands[i]->isLoopInvariant(l) &&
"Operands of AddRec must be loop-invariant!");
}
~SCEVAddRecExpr();
public:
const SCEVHandle &getStart() const { return Operands[0]; }
@ -524,9 +516,7 @@ namespace llvm {
Value *V;
explicit SCEVUnknown(Value *v, const ScalarEvolution* p) :
SCEV(scUnknown, p), V(v) {}
protected:
~SCEVUnknown();
public:
Value *getValue() const { return V; }

108
lib/Analysis/ScalarEvolution.cpp
View File

@ -171,15 +171,9 @@ bool SCEVCouldNotCompute::classof(const SCEV *S) {
// SCEVConstants - Only allow the creation of one SCEVConstant for any
// particular value. Don't use a SCEVHandle here, or else the object will
// never be deleted!
static ManagedStatic<std::map<ConstantInt*, SCEVConstant*> > SCEVConstants;
SCEVConstant::~SCEVConstant() {
SCEVConstants->erase(V);
}
SCEVHandle ScalarEvolution::getConstant(ConstantInt *V) {
SCEVConstant *&R = (*SCEVConstants)[V];
SCEVConstant *&R = SCEVConstants[V];
if (R == 0) R = new SCEVConstant(V, this);
return R;
}
@ -213,8 +207,6 @@ bool SCEVCastExpr::dominates(BasicBlock *BB, DominatorTree *DT) const {
// SCEVTruncates - Only allow the creation of one SCEVTruncateExpr for any
// particular input. Don't use a SCEVHandle here, or else the object will
// never be deleted!
static ManagedStatic<std::map<std::pair<const SCEV*, const Type*>,
SCEVTruncateExpr*> > SCEVTruncates;
SCEVTruncateExpr::SCEVTruncateExpr(const SCEVHandle &op, const Type *ty,
const ScalarEvolution* p)
@ -224,9 +216,6 @@ SCEVTruncateExpr::SCEVTruncateExpr(const SCEVHandle &op, const Type *ty,
"Cannot truncate non-integer value!");
}
SCEVTruncateExpr::~SCEVTruncateExpr() {
SCEVTruncates->erase(std::make_pair(Op, Ty));
}
void SCEVTruncateExpr::print(raw_ostream &OS) const {
OS << "(trunc " << *Op->getType() << " " << *Op << " to " << *Ty << ")";
@ -235,8 +224,6 @@ void SCEVTruncateExpr::print(raw_ostream &OS) const {
// SCEVZeroExtends - Only allow the creation of one SCEVZeroExtendExpr for any
// particular input. Don't use a SCEVHandle here, or else the object will never
// be deleted!
static ManagedStatic<std::map<std::pair<const SCEV*, const Type*>,
SCEVZeroExtendExpr*> > SCEVZeroExtends;
SCEVZeroExtendExpr::SCEVZeroExtendExpr(const SCEVHandle &op, const Type *ty,
const ScalarEvolution* p)
@ -246,10 +233,6 @@ SCEVZeroExtendExpr::SCEVZeroExtendExpr(const SCEVHandle &op, const Type *ty,
"Cannot zero extend non-integer value!");
}
SCEVZeroExtendExpr::~SCEVZeroExtendExpr() {
SCEVZeroExtends->erase(std::make_pair(Op, Ty));
}
void SCEVZeroExtendExpr::print(raw_ostream &OS) const {
OS << "(zext " << *Op->getType() << " " << *Op << " to " << *Ty << ")";
}
@ -257,8 +240,6 @@ void SCEVZeroExtendExpr::print(raw_ostream &OS) const {
// SCEVSignExtends - Only allow the creation of one SCEVSignExtendExpr for any
// particular input. Don't use a SCEVHandle here, or else the object will never
// be deleted!
static ManagedStatic<std::map<std::pair<const SCEV*, const Type*>,
SCEVSignExtendExpr*> > SCEVSignExtends;
SCEVSignExtendExpr::SCEVSignExtendExpr(const SCEVHandle &op, const Type *ty,
const ScalarEvolution* p)
@ -268,10 +249,6 @@ SCEVSignExtendExpr::SCEVSignExtendExpr(const SCEVHandle &op, const Type *ty,
"Cannot sign extend non-integer value!");
}
SCEVSignExtendExpr::~SCEVSignExtendExpr() {
SCEVSignExtends->erase(std::make_pair(Op, Ty));
}
void SCEVSignExtendExpr::print(raw_ostream &OS) const {
OS << "(sext " << *Op->getType() << " " << *Op << " to " << *Ty << ")";
}
@ -279,13 +256,6 @@ void SCEVSignExtendExpr::print(raw_ostream &OS) const {
// SCEVCommExprs - Only allow the creation of one SCEVCommutativeExpr for any
// particular input. Don't use a SCEVHandle here, or else the object will never
// be deleted!
static ManagedStatic<std::map<std::pair<unsigned, std::vector<const SCEV*> >,
SCEVCommutativeExpr*> > SCEVCommExprs;
SCEVCommutativeExpr::~SCEVCommutativeExpr() {
std::vector<const SCEV*> SCEVOps(Operands.begin(), Operands.end());
SCEVCommExprs->erase(std::make_pair(getSCEVType(), SCEVOps));
}
void SCEVCommutativeExpr::print(raw_ostream &OS) const {
assert(Operands.size() > 1 && "This plus expr shouldn't exist!");
@ -340,12 +310,6 @@ bool SCEVNAryExpr::dominates(BasicBlock *BB, DominatorTree *DT) const {
// SCEVUDivs - Only allow the creation of one SCEVUDivExpr for any particular
// input. Don't use a SCEVHandle here, or else the object will never be
// deleted!
static ManagedStatic<std::map<std::pair<const SCEV*, const SCEV*>,
SCEVUDivExpr*> > SCEVUDivs;
SCEVUDivExpr::~SCEVUDivExpr() {
SCEVUDivs->erase(std::make_pair(LHS, RHS));
}
bool SCEVUDivExpr::dominates(BasicBlock *BB, DominatorTree *DT) const {
return LHS->dominates(BB, DT) && RHS->dominates(BB, DT);
@ -367,14 +331,6 @@ const Type *SCEVUDivExpr::getType() const {
// SCEVAddRecExprs - Only allow the creation of one SCEVAddRecExpr for any
// particular input. Don't use a SCEVHandle here, or else the object will never
// be deleted!
static ManagedStatic<std::map<std::pair<const Loop *,
std::vector<const SCEV*> >,
SCEVAddRecExpr*> > SCEVAddRecExprs;
SCEVAddRecExpr::~SCEVAddRecExpr() {
std::vector<const SCEV*> SCEVOps(Operands.begin(), Operands.end());
SCEVAddRecExprs->erase(std::make_pair(L, SCEVOps));
}
SCEVHandle SCEVAddRecExpr::
replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
@ -420,9 +376,6 @@ void SCEVAddRecExpr::print(raw_ostream &OS) const {
// SCEVUnknowns - Only allow the creation of one SCEVUnknown for any particular
// value. Don't use a SCEVHandle here, or else the object will never be
// deleted!
static ManagedStatic<std::map<Value*, SCEVUnknown*> > SCEVUnknowns;
SCEVUnknown::~SCEVUnknown() { SCEVUnknowns->erase(V); }
bool SCEVUnknown::isLoopInvariant(const Loop *L) const {
// All non-instruction values are loop invariant. All instructions are loop
@ -791,7 +744,7 @@ SCEVHandle ScalarEvolution::getTruncateExpr(const SCEVHandle &Op,
return getAddRecExpr(Operands, AddRec->getLoop());
}
SCEVTruncateExpr *&Result = (*SCEVTruncates)[std::make_pair(Op, Ty)];
SCEVTruncateExpr *&Result = SCEVTruncates[std::make_pair(Op, Ty)];
if (Result == 0) Result = new SCEVTruncateExpr(Op, Ty, this);
return Result;
}
@ -879,7 +832,7 @@ SCEVHandle ScalarEvolution::getZeroExtendExpr(const SCEVHandle &Op,
}
}
SCEVZeroExtendExpr *&Result = (*SCEVZeroExtends)[std::make_pair(Op, Ty)];
SCEVZeroExtendExpr *&Result = SCEVZeroExtends[std::make_pair(Op, Ty)];
if (Result == 0) Result = new SCEVZeroExtendExpr(Op, Ty, this);
return Result;
}
@ -951,7 +904,7 @@ SCEVHandle ScalarEvolution::getSignExtendExpr(const SCEVHandle &Op,
}
}
SCEVSignExtendExpr *&Result = (*SCEVSignExtends)[std::make_pair(Op, Ty)];
SCEVSignExtendExpr *&Result = SCEVSignExtends[std::make_pair(Op, Ty)];
if (Result == 0) Result = new SCEVSignExtendExpr(Op, Ty, this);
return Result;
}
@ -1412,7 +1365,7 @@ SCEVHandle ScalarEvolution::getAddExpr(SmallVectorImpl<SCEVHandle> &Ops) {
// Okay, it looks like we really DO need an add expr. Check to see if we
// already have one, otherwise create a new one.
std::vector<const SCEV*> SCEVOps(Ops.begin(), Ops.end());
SCEVCommutativeExpr *&Result = (*SCEVCommExprs)[std::make_pair(scAddExpr,
SCEVCommutativeExpr *&Result = SCEVCommExprs[std::make_pair(scAddExpr,
SCEVOps)];
if (Result == 0) Result = new SCEVAddExpr(Ops, this);
return Result;
@ -1577,7 +1530,7 @@ SCEVHandle ScalarEvolution::getMulExpr(SmallVectorImpl<SCEVHandle> &Ops) {
// Okay, it looks like we really DO need an mul expr. Check to see if we
// already have one, otherwise create a new one.
std::vector<const SCEV*> SCEVOps(Ops.begin(), Ops.end());
SCEVCommutativeExpr *&Result = (*SCEVCommExprs)[std::make_pair(scMulExpr,
SCEVCommutativeExpr *&Result = SCEVCommExprs[std::make_pair(scMulExpr,
SCEVOps)];
if (Result == 0)
Result = new SCEVMulExpr(Ops, this);
@ -1670,7 +1623,7 @@ SCEVHandle ScalarEvolution::getUDivExpr(const SCEVHandle &LHS,
}
}
SCEVUDivExpr *&Result = (*SCEVUDivs)[std::make_pair(LHS, RHS)];
SCEVUDivExpr *&Result = SCEVUDivs[std::make_pair(LHS, RHS)];
if (Result == 0) Result = new SCEVUDivExpr(LHS, RHS, this);
return Result;
}
@ -1724,7 +1677,7 @@ SCEVHandle ScalarEvolution::getAddRecExpr(SmallVectorImpl<SCEVHandle> &Operands,
}
std::vector<const SCEV*> SCEVOps(Operands.begin(), Operands.end());
SCEVAddRecExpr *&Result = (*SCEVAddRecExprs)[std::make_pair(L, SCEVOps)];
SCEVAddRecExpr *&Result = SCEVAddRecExprs[std::make_pair(L, SCEVOps)];
if (Result == 0) Result = new SCEVAddRecExpr(Operands, L, this);
return Result;
}
@ -1810,7 +1763,7 @@ ScalarEvolution::getSMaxExpr(SmallVectorImpl<SCEVHandle> &Ops) {
// Okay, it looks like we really DO need an smax expr. Check to see if we
// already have one, otherwise create a new one.
std::vector<const SCEV*> SCEVOps(Ops.begin(), Ops.end());
SCEVCommutativeExpr *&Result = (*SCEVCommExprs)[std::make_pair(scSMaxExpr,
SCEVCommutativeExpr *&Result = SCEVCommExprs[std::make_pair(scSMaxExpr,
SCEVOps)];
if (Result == 0) Result = new SCEVSMaxExpr(Ops, this);
return Result;
@ -1897,7 +1850,7 @@ ScalarEvolution::getUMaxExpr(SmallVectorImpl<SCEVHandle> &Ops) {
// Okay, it looks like we really DO need a umax expr. Check to see if we
// already have one, otherwise create a new one.
std::vector<const SCEV*> SCEVOps(Ops.begin(), Ops.end());
SCEVCommutativeExpr *&Result = (*SCEVCommExprs)[std::make_pair(scUMaxExpr,
SCEVCommutativeExpr *&Result = SCEVCommExprs[std::make_pair(scUMaxExpr,
SCEVOps)];
if (Result == 0) Result = new SCEVUMaxExpr(Ops, this);
return Result;
@ -1920,7 +1873,7 @@ SCEVHandle ScalarEvolution::getUnknown(Value *V) {
return getConstant(CI);
if (isa<ConstantPointerNull>(V))
return getIntegerSCEV(0, V->getType());
SCEVUnknown *&Result = (*SCEVUnknowns)[V];
SCEVUnknown *&Result = SCEVUnknowns[V];
if (Result == 0) Result = new SCEVUnknown(V, this);
return Result;
}
@ -4324,6 +4277,45 @@ void ScalarEvolution::releaseMemory() {
BackedgeTakenCounts.clear();
ConstantEvolutionLoopExitValue.clear();
ValuesAtScopes.clear();
for (std::map<ConstantInt*, SCEVConstant*>::iterator
I = SCEVConstants.begin(), E = SCEVConstants.end(); I != E; ++I)
delete I->second;
for (std::map<std::pair<const SCEV*, const Type*>,
SCEVTruncateExpr*>::iterator I = SCEVTruncates.begin(),
E = SCEVTruncates.end(); I != E; ++I)
delete I->second;
for (std::map<std::pair<const SCEV*, const Type*>,
SCEVZeroExtendExpr*>::iterator I = SCEVZeroExtends.begin(),
E = SCEVZeroExtends.end(); I != E; ++I)
delete I->second;
for (std::map<std::pair<unsigned, std::vector<const SCEV*> >,
SCEVCommutativeExpr*>::iterator I = SCEVCommExprs.begin(),
E = SCEVCommExprs.end(); I != E; ++I)
delete I->second;
for (std::map<std::pair<const SCEV*, const SCEV*>, SCEVUDivExpr*>::iterator
I = SCEVUDivs.begin(), E = SCEVUDivs.end(); I != E; ++I)
delete I->second;
for (std::map<std::pair<const SCEV*, const Type*>,
SCEVSignExtendExpr*>::iterator I = SCEVSignExtends.begin(),
E = SCEVSignExtends.end(); I != E; ++I)
delete I->second;
for (std::map<std::pair<const Loop *, std::vector<const SCEV*> >,
SCEVAddRecExpr*>::iterator I = SCEVAddRecExprs.begin(),
E = SCEVAddRecExprs.end(); I != E; ++I)
delete I->second;
for (std::map<Value*, SCEVUnknown*>::iterator I = SCEVUnknowns.begin(),
E = SCEVUnknowns.end(); I != E; ++I)
delete I->second;
SCEVConstants.clear();
SCEVTruncates.clear();
SCEVZeroExtends.clear();
SCEVCommExprs.clear();
SCEVUDivs.clear();
SCEVSignExtends.clear();
SCEVAddRecExprs.clear();
SCEVUnknowns.clear();
}
void ScalarEvolution::getAnalysisUsage(AnalysisUsage &AU) const {