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Add the ability to "intern" FoldingSetNodeID data into a

Browse Source 
BumpPtrAllocator-allocated region to allow it to be stored in a more
compact form and to avoid the need for a non-trivial destructor call.

Use this new mechanism in ScalarEvolution instead of
FastFoldingSetNode to avoid leaking memory in the case where a
FoldingSetNodeID uses heap storage, and to reduce overall memory
usage.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98829 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-03-18 16:16:38 +00:00
parent 7c4a121110
commit c93b4cff89
5 changed files with 76 additions and 40 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
include/llvm/Analysis/ScalarEvolution.h
View File

@@ -49,7 +49,11 @@ namespace llvm {
/// are opaque objects that the client is not allowed to do much with
/// directly.
///
class SCEV : public FastFoldingSetNode {
class SCEV : public FoldingSetNode {
/// FastID - A reference to an Interned FoldingSetNodeID for this node.
/// The ScalarEvolution's BumpPtrAllocator holds the data.
FoldingSetNodeIDRef FastID;
// The SCEV baseclass this node corresponds to
const unsigned short SCEVType;
@@ -64,11 +68,14 @@ namespace llvm {
protected:
virtual ~SCEV();
public:
explicit SCEV(const FoldingSetNodeID &ID, unsigned SCEVTy) :
FastFoldingSetNode(ID), SCEVType(SCEVTy), SubclassData(0) {}
explicit SCEV(const FoldingSetNodeIDRef ID, unsigned SCEVTy) :
FastID(ID), SCEVType(SCEVTy), SubclassData(0) {}
unsigned getSCEVType() const { return SCEVType; }
/// Profile - FoldingSet support.
void Profile(FoldingSetNodeID& ID) { ID = FastID; }
/// isLoopInvariant - Return true if the value of this SCEV is unchanging in
/// the specified loop.
virtual bool isLoopInvariant(const Loop *L) const = 0;

31
include/llvm/Analysis/ScalarEvolutionExpressions.h
View File

@@ -37,7 +37,7 @@ namespace llvm {
friend class ScalarEvolution;
ConstantInt *V;
SCEVConstant(const FoldingSetNodeID &ID, ConstantInt *v) :
SCEVConstant(const FoldingSetNodeIDRef ID, ConstantInt *v) :
SCEV(ID, scConstant), V(v) {}
public:
ConstantInt *getValue() const { return V; }
@@ -81,7 +81,7 @@ namespace llvm {
const SCEV *Op;
const Type *Ty;
SCEVCastExpr(const FoldingSetNodeID &ID,
SCEVCastExpr(const FoldingSetNodeIDRef ID,
unsigned SCEVTy, const SCEV *op, const Type *ty);
public:
@@ -120,7 +120,7 @@ namespace llvm {
class SCEVTruncateExpr : public SCEVCastExpr {
friend class ScalarEvolution;
SCEVTruncateExpr(const FoldingSetNodeID &ID,
SCEVTruncateExpr(const FoldingSetNodeIDRef ID,
const SCEV *op, const Type *ty);
public:
@@ -140,7 +140,7 @@ namespace llvm {
class SCEVZeroExtendExpr : public SCEVCastExpr {
friend class ScalarEvolution;
SCEVZeroExtendExpr(const FoldingSetNodeID &ID,
SCEVZeroExtendExpr(const FoldingSetNodeIDRef ID,
const SCEV *op, const Type *ty);
public:
@@ -160,7 +160,7 @@ namespace llvm {
class SCEVSignExtendExpr : public SCEVCastExpr {
friend class ScalarEvolution;
SCEVSignExtendExpr(const FoldingSetNodeID &ID,
SCEVSignExtendExpr(const FoldingSetNodeIDRef ID,
const SCEV *op, const Type *ty);
public:
@@ -187,7 +187,7 @@ namespace llvm {
const SCEV *const *Operands;
size_t NumOperands;
SCEVNAryExpr(const FoldingSetNodeID &ID,
SCEVNAryExpr(const FoldingSetNodeIDRef ID,
enum SCEVTypes T, const SCEV *const *O, size_t N)
: SCEV(ID, T), Operands(O), NumOperands(N) {}
@@ -262,9 +262,8 @@ namespace llvm {
///
class SCEVCommutativeExpr : public SCEVNAryExpr {
protected:
SCEVCommutativeExpr(const FoldingSetNodeID &ID,
enum SCEVTypes T,
const SCEV *const *O, size_t N)
SCEVCommutativeExpr(const FoldingSetNodeIDRef ID,
enum SCEVTypes T, const SCEV *const *O, size_t N)
: SCEVNAryExpr(ID, T, O, N) {}
public:
@@ -289,7 +288,7 @@ namespace llvm {
class SCEVAddExpr : public SCEVCommutativeExpr {
friend class ScalarEvolution;
SCEVAddExpr(const FoldingSetNodeID &ID,
SCEVAddExpr(const FoldingSetNodeIDRef ID,
const SCEV *const *O, size_t N)
: SCEVCommutativeExpr(ID, scAddExpr, O, N) {
}
@@ -317,7 +316,7 @@ namespace llvm {
class SCEVMulExpr : public SCEVCommutativeExpr {
friend class ScalarEvolution;
SCEVMulExpr(const FoldingSetNodeID &ID,
SCEVMulExpr(const FoldingSetNodeIDRef ID,
const SCEV *const *O, size_t N)
: SCEVCommutativeExpr(ID, scMulExpr, O, N) {
}
@@ -341,7 +340,7 @@ namespace llvm {
const SCEV *LHS;
const SCEV *RHS;
SCEVUDivExpr(const FoldingSetNodeID &ID, const SCEV *lhs, const SCEV *rhs)
SCEVUDivExpr(const FoldingSetNodeIDRef ID, const SCEV *lhs, const SCEV *rhs)
: SCEV(ID, scUDivExpr), LHS(lhs), RHS(rhs) {}
public:
@@ -391,7 +390,7 @@ namespace llvm {
const Loop *L;
SCEVAddRecExpr(const FoldingSetNodeID &ID,
SCEVAddRecExpr(const FoldingSetNodeIDRef ID,
const SCEV *const *O, size_t N, const Loop *l)
: SCEVNAryExpr(ID, scAddRecExpr, O, N), L(l) {
for (size_t i = 0, e = NumOperands; i != e; ++i)
@@ -473,7 +472,7 @@ namespace llvm {
class SCEVSMaxExpr : public SCEVCommutativeExpr {
friend class ScalarEvolution;
SCEVSMaxExpr(const FoldingSetNodeID &ID,
SCEVSMaxExpr(const FoldingSetNodeIDRef ID,
const SCEV *const *O, size_t N)
: SCEVCommutativeExpr(ID, scSMaxExpr, O, N) {
// Max never overflows.
@@ -498,7 +497,7 @@ namespace llvm {
class SCEVUMaxExpr : public SCEVCommutativeExpr {
friend class ScalarEvolution;
SCEVUMaxExpr(const FoldingSetNodeID &ID,
SCEVUMaxExpr(const FoldingSetNodeIDRef ID,
const SCEV *const *O, size_t N)
: SCEVCommutativeExpr(ID, scUMaxExpr, O, N) {
// Max never overflows.
@@ -525,7 +524,7 @@ namespace llvm {
friend class ScalarEvolution;
Value *V;
SCEVUnknown(const FoldingSetNodeID &ID, Value *v) :
SCEVUnknown(const FoldingSetNodeIDRef ID, Value *v) :
SCEV(ID, scUnknown), V(v) {}
public: