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Add a new replaceSymbolicValuesWithConcrete method to the SCEV class,

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adjust const'ness a bit to be more correct.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20145 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-02-13 04:34:51 +00:00
parent 39bcf5b8d0
commit afc0dc7184
2 changed files with 59 additions and 5 deletions
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21
include/llvm/Analysis/ScalarEvolution.h
View File

@ -38,11 +38,11 @@ namespace llvm {
///
class SCEV {
const unsigned SCEVType; // The SCEV baseclass this node corresponds to
unsigned RefCount;
mutable unsigned RefCount;
friend class SCEVHandle;
void addRef() { ++RefCount; }
void dropRef() {
void addRef() const { ++RefCount; }
void dropRef() const {
if (--RefCount == 0)
delete this;
}
@ -74,6 +74,15 @@ namespace llvm {
///
virtual const Type *getType() const = 0;
/// replaceSymbolicValuesWithConcrete - If this SCEV internally references
/// the symbolic value "Sym", construct and return a new SCEV that produces
/// the same value, but which uses the concrete value Conc instead of the
/// symbolic value. If this SCEV does not use the symbolic value, it
/// returns itself.
virtual SCEVHandle
replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
const SCEVHandle &Conc) const = 0;
/// print - Print out the internal representation of this scalar to the
/// specified stream. This should really only be used for debugging
/// purposes.
@ -102,7 +111,9 @@ namespace llvm {
virtual const Type *getType() const;
virtual bool hasComputableLoopEvolution(const Loop *L) const;
virtual void print(std::ostream &OS) const;
virtual SCEVHandle
replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
const SCEVHandle &Conc) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVCouldNotCompute *S) { return true; }
@ -115,7 +126,7 @@ namespace llvm {
SCEV *S;
SCEVHandle(); // DO NOT IMPLEMENT
public:
SCEVHandle(SCEV *s) : S(s) {
SCEVHandle(const SCEV *s) : S(const_cast<SCEV*>(s)) {
assert(S && "Cannot create a handle to a null SCEV!");
S->addRef();
}

43
include/llvm/Analysis/ScalarEvolutionExpressions.h
View File

@ -56,6 +56,11 @@ namespace llvm {
virtual const Type *getType() const;
SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
const SCEVHandle &Conc) const {
return this;
}
virtual void print(std::ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
@ -90,6 +95,14 @@ namespace llvm {
return Op->hasComputableLoopEvolution(L);
}
SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
const SCEVHandle &Conc) const {
SCEVHandle H = Op->replaceSymbolicValuesWithConcrete(Sym, Conc);
if (H == Op)
return this;
return get(H, Ty);
}
/// getValueRange - Return the tightest constant bounds that this value is
/// known to have. This method is only valid on integer SCEV objects.
virtual ConstantRange getValueRange() const;
@ -132,6 +145,14 @@ namespace llvm {
/// known to have. This method is only valid on integer SCEV objects.
virtual ConstantRange getValueRange() const;
SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
const SCEVHandle &Conc) const {
SCEVHandle H = Op->replaceSymbolicValuesWithConcrete(Sym, Conc);
if (H == Op)
return this;
return get(H, Ty);
}
virtual void print(std::ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
@ -182,6 +203,9 @@ namespace llvm {
return false;
}
SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
const SCEVHandle &Conc) const;
virtual const char *getOperationStr() const = 0;
virtual const Type *getType() const { return getOperand(0)->getType(); }
@ -286,6 +310,17 @@ namespace llvm {
RHS->hasComputableLoopEvolution(L);
}
SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
const SCEVHandle &Conc) const {
SCEVHandle L = LHS->replaceSymbolicValuesWithConcrete(Sym, Conc);
SCEVHandle R = RHS->replaceSymbolicValuesWithConcrete(Sym, Conc);
if (L == LHS && R == RHS)
return this;
else
return get(L, R);
}
virtual const Type *getType() const;
void print(std::ostream &OS) const;
@ -383,6 +418,8 @@ namespace llvm {
/// returned.
SCEVHandle getNumIterationsInRange(ConstantRange Range) const;
SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
const SCEVHandle &Conc) const;
virtual void print(std::ostream &OS) const;
@ -420,6 +457,12 @@ namespace llvm {
return false; // not computable
}
SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
const SCEVHandle &Conc) const {
if (&*Sym == this) return Conc;
return this;
}
virtual const Type *getType() const;
virtual void print(std::ostream &OS) const;