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Remove the SCEV::expandCodeFor method, add a new SCEVVisitor class.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13133 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-04-23 21:28:25 +00:00
parent f4789e6d04
commit 2cdf0a7a32
2 changed files with 40 additions and 86 deletions
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57
include/llvm/Analysis/ScalarEvolution.h
View File

@ -31,7 +31,6 @@ namespace llvm {
class Loop;
class LoopInfo;
class SCEVHandle;
class ScalarEvolutionRewriter;
/// SCEV - This class represent an analyzed expression in the program. These
/// are reference counted opaque objects that the client is not allowed to
@ -75,13 +74,6 @@ namespace llvm {
///
virtual const Type *getType() const = 0;
/// expandCodeFor - Given a rewriter object, expand this SCEV into a closed
/// form expression and return a Value corresponding to the expression in
/// question.
virtual Value *expandCodeFor(ScalarEvolutionRewriter &SER,
Instruction *InsertPt) = 0;
/// print - Print out the internal representation of this scalar to the
/// specified stream. This should really only be used for debugging
/// purposes.
@ -109,7 +101,6 @@ namespace llvm {
virtual bool isLoopInvariant(const Loop *L) const;
virtual const Type *getType() const;
virtual bool hasComputableLoopEvolution(const Loop *L) const;
virtual Value *expandCodeFor(ScalarEvolutionRewriter &, Instruction *);
virtual void print(std::ostream &OS) const;
@ -219,54 +210,6 @@ namespace llvm {
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
virtual void print(std::ostream &OS) const;
};
/// ScalarEvolutionRewriter - This class uses information about analyze
/// scalars to rewrite expressions in canonical form. This can be used for
/// induction variable substitution, strength reduction, or loop exit value
/// replacement.
///
/// Clients should create an instance of this class when rewriting is needed,
/// and destroying it when finished to allow the release of the associated
/// memory.
class ScalarEvolutionRewriter {
ScalarEvolution &SE;
LoopInfo &LI;
std::map<SCEVHandle, Value*> InsertedExpressions;
std::set<Instruction*> InsertedInstructions;
public:
ScalarEvolutionRewriter(ScalarEvolution &se, LoopInfo &li)
: SE(se), LI(li) {}
/// isInsertedInstruction - Return true if the specified instruction was
/// inserted by the code rewriter. If so, the client should not modify the
/// instruction.
bool isInsertedInstruction(Instruction *I) const {
return InsertedInstructions.count(I);
}
/// GetOrInsertCanonicalInductionVariable - This method returns the
/// canonical induction variable of the specified type for the specified
/// loop (inserts one if there is none). A canonical induction variable
/// starts at zero and steps by one on each iteration.
Value *GetOrInsertCanonicalInductionVariable(const Loop *L, const Type *Ty);
/// addInsertedValue - Remember the specified instruction as being the
/// canonical form for the specified SCEV.
void addInsertedValue(Instruction *I, SCEV *S) {
InsertedExpressions[S] = (Value*)I;
InsertedInstructions.insert(I);
}
/// ExpandCodeFor - Insert code to directly compute the specified SCEV
/// expression into the program. The inserted code is inserted into the
/// specified block.
///
/// If a particular value sign is required, a type may be specified for the
/// result.
Value *ExpandCodeFor(SCEVHandle SH, Instruction *InsertPt,
const Type *Ty = 0);
};
}
#endif

69
include/llvm/Analysis/ScalarEvolutionExpressions.h
View File

@ -56,11 +56,6 @@ namespace llvm {
virtual const Type *getType() const;
Value *expandCodeFor(ScalarEvolutionRewriter &SER,
Instruction *InsertPt) {
return (Value*)getValue();
}
virtual void print(std::ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
@ -99,9 +94,6 @@ namespace llvm {
/// known to have. This method is only valid on integer SCEV objects.
virtual ConstantRange getValueRange() const;
Value *expandCodeFor(ScalarEvolutionRewriter &SER,
Instruction *InsertPt);
virtual void print(std::ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
@ -140,9 +132,6 @@ namespace llvm {
/// known to have. This method is only valid on integer SCEV objects.
virtual ConstantRange getValueRange() const;
Value *expandCodeFor(ScalarEvolutionRewriter &SER,
Instruction *InsertPt);
virtual void print(std::ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
@ -236,9 +225,6 @@ namespace llvm {
virtual const char *getOperationStr() const { return " + "; }
Value *expandCodeFor(ScalarEvolutionRewriter &SER,
Instruction *InsertPt);
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVAddExpr *S) { return true; }
static inline bool classof(const SCEV *S) {
@ -266,9 +252,6 @@ namespace llvm {
virtual const char *getOperationStr() const { return " * "; }
Value *expandCodeFor(ScalarEvolutionRewriter &SER,
Instruction *InsertPt);
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVMulExpr *S) { return true; }
static inline bool classof(const SCEV *S) {
@ -305,9 +288,6 @@ namespace llvm {
virtual const Type *getType() const;
Value *expandCodeFor(ScalarEvolutionRewriter &SER,
Instruction *InsertPt);
void print(std::ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
@ -376,10 +356,6 @@ namespace llvm {
virtual const Type *getType() const { return Operands[0]->getType(); }
Value *expandCodeFor(ScalarEvolutionRewriter &SER,
Instruction *InsertPt);
/// isAffine - Return true if this is an affine AddRec (i.e., it represents
/// an expressions A+B*x where A and B are loop invariant values.
bool isAffine() const {
@ -433,12 +409,11 @@ namespace llvm {
/// SCEVUnknown.
static SCEVHandle get(Value *V);
Value *getValue() const { return V; }
/// getIntegerSCEV - Given an integer or FP type, create a constant for the
/// specified signed integer value and return a SCEV for the constant.
static SCEVHandle getIntegerSCEV(int Val, const Type *Ty);
Value *expandCodeFor(ScalarEvolutionRewriter &SER,
Instruction *InsertPt) {
return V;
}
Value *getValue() const { return V; }
virtual bool isLoopInvariant(const Loop *L) const;
virtual bool hasComputableLoopEvolution(const Loop *QL) const {
@ -455,6 +430,42 @@ namespace llvm {
return S->getSCEVType() == scUnknown;
}
};
/// SCEVVisitor - This class defines a simple visitor class that may be used
/// for various SCEV analysis purposes.
template<typename SC, typename RetVal=void>
struct SCEVVisitor {
RetVal visit(SCEV *S) {
switch (S->getSCEVType()) {
case scConstant:
return ((SC*)this)->visitConstant((SCEVConstant*)S);
case scTruncate:
return ((SC*)this)->visitTruncateExpr((SCEVTruncateExpr*)S);
case scZeroExtend:
return ((SC*)this)->visitZeroExtendExpr((SCEVZeroExtendExpr*)S);
case scAddExpr:
return ((SC*)this)->visitAddExpr((SCEVAddExpr*)S);
case scMulExpr:
return ((SC*)this)->visitMulExpr((SCEVMulExpr*)S);
case scUDivExpr:
return ((SC*)this)->visitUDivExpr((SCEVUDivExpr*)S);
case scAddRecExpr:
return ((SC*)this)->visitAddRecExpr((SCEVAddRecExpr*)S);
case scUnknown:
return ((SC*)this)->visitUnknown((SCEVUnknown*)S);
case scCouldNotCompute:
return ((SC*)this)->visitCouldNotCompute((SCEVCouldNotCompute*)S);
default:
assert(0 && "Unknown SCEV type!");
}
}
RetVal visitCouldNotCompute(SCEVCouldNotCompute *S) {
assert(0 && "Invalid use of SCEVCouldNotCompute!");
abort();
return RetVal();
}
};
}
#endif