#define LLVM_ANALYSIS_IVUSERS_H
#include "llvm/Analysis/LoopPass.h"
+#include "llvm/Analysis/ScalarEvolutionNormalization.h"
#include "llvm/Support/ValueHandle.h"
namespace llvm {
class IVUsers;
class ScalarEvolution;
class SCEV;
+class IVUsers;
+class DataLayout;
/// IVStrideUse - Keep track of one use of a strided induction variable.
/// The Expr member keeps track of the expression, User is the actual user
/// instruction of the operand, and 'OperandValToReplace' is the operand of
/// the User that is the use.
class IVStrideUse : public CallbackVH, public ilist_node<IVStrideUse> {
+ friend class IVUsers;
public:
- IVStrideUse(IVUsers *P, const SCEV *S, const SCEV *Off,
- Instruction* U, Value *O)
- : CallbackVH(U), Parent(P), Stride(S), Offset(Off),
- OperandValToReplace(O), IsUseOfPostIncrementedValue(false) {
+ IVStrideUse(IVUsers *P, Instruction* U, Value *O)
+ : CallbackVH(U), Parent(P), OperandValToReplace(O) {
}
/// getUser - Return the user instruction for this use.
setValPtr(NewUser);
}
- /// getParent - Return a pointer to the IVUsers that owns
- /// this IVStrideUse.
- IVUsers *getParent() const { return Parent; }
-
- /// getStride - Return the expression for the stride for the use.
- const SCEV *getStride() const { return Stride; }
-
- /// setStride - Assign a new stride to this use.
- void setStride(const SCEV *Val) {
- Stride = Val;
- }
-
- /// getOffset - Return the offset to add to a theoeretical induction
- /// variable that starts at zero and counts up by the stride to compute
- /// the value for the use. This always has the same type as the stride.
- const SCEV *getOffset() const { return Offset; }
-
- /// setOffset - Assign a new offset to this use.
- void setOffset(const SCEV *Val) {
- Offset = Val;
- }
-
/// getOperandValToReplace - Return the Value of the operand in the user
/// instruction that this IVStrideUse is representing.
Value *getOperandValToReplace() const {
OperandValToReplace = Op;
}
- /// isUseOfPostIncrementedValue - True if this should use the
- /// post-incremented version of this IV, not the preincremented version.
- /// This can only be set in special cases, such as the terminating setcc
- /// instruction for a loop or uses dominated by the loop.
- bool isUseOfPostIncrementedValue() const {
- return IsUseOfPostIncrementedValue;
+ /// getPostIncLoops - Return the set of loops for which the expression has
+ /// been adjusted to use post-inc mode.
+ const PostIncLoopSet &getPostIncLoops() const {
+ return PostIncLoops;
}
- /// setIsUseOfPostIncrmentedValue - set the flag that indicates whether
- /// this is a post-increment use.
- void setIsUseOfPostIncrementedValue(bool Val) {
- IsUseOfPostIncrementedValue = Val;
- }
+ /// transformToPostInc - Transform the expression to post-inc form for the
+ /// given loop.
+ void transformToPostInc(const Loop *L);
private:
/// Parent - a pointer to the IVUsers that owns this IVStrideUse.
IVUsers *Parent;
- /// Stride - The stride for this use.
- const SCEV *Stride;
-
- /// Offset - The offset to add to the base induction expression.
- const SCEV *Offset;
-
/// OperandValToReplace - The Value of the operand in the user instruction
/// that this IVStrideUse is representing.
WeakVH OperandValToReplace;
- /// IsUseOfPostIncrementedValue - True if this should use the
- /// post-incremented version of this IV, not the preincremented version.
- bool IsUseOfPostIncrementedValue;
+ /// PostIncLoops - The set of loops for which Expr has been adjusted to
+ /// use post-inc mode. This corresponds with SCEVExpander's post-inc concept.
+ PostIncLoopSet PostIncLoops;
/// Deleted - Implementation of CallbackVH virtual function to
- /// recieve notification when the User is deleted.
+ /// receive notification when the User is deleted.
virtual void deleted();
};
LoopInfo *LI;
DominatorTree *DT;
ScalarEvolution *SE;
+ DataLayout *TD;
SmallPtrSet<Instruction*,16> Processed;
/// IVUses - A list of all tracked IV uses of induction variable expressions
static char ID; // Pass ID, replacement for typeid
IVUsers();
+ Loop *getLoop() const { return L; }
+
/// AddUsersIfInteresting - Inspect the specified Instruction. If it is a
/// reducible SCEV, recursively add its users to the IVUsesByStride set and
/// return true. Otherwise, return false.
bool AddUsersIfInteresting(Instruction *I);
- IVStrideUse &AddUser(const SCEV *Stride, const SCEV *Offset,
- Instruction *User, Value *Operand);
+ IVStrideUse &AddUser(Instruction *User, Value *Operand);
/// getReplacementExpr - Return a SCEV expression which computes the
/// value of the OperandValToReplace of the given IVStrideUse.
- const SCEV *getReplacementExpr(const IVStrideUse &U) const;
+ const SCEV *getReplacementExpr(const IVStrideUse &IU) const;
- /// getCanonicalExpr - Return a SCEV expression which computes the
- /// value of the SCEV of the given IVStrideUse, ignoring the
- /// isUseOfPostIncrementedValue flag.
- const SCEV *getCanonicalExpr(const IVStrideUse &U) const;
+ /// getExpr - Return the expression for the use.
+ const SCEV *getExpr(const IVStrideUse &IU) const;
+
+ const SCEV *getStride(const IVStrideUse &IU, const Loop *L) const;
typedef ilist<IVStrideUse>::iterator iterator;
typedef ilist<IVStrideUse>::const_iterator const_iterator;
const_iterator end() const { return IVUses.end(); }
bool empty() const { return IVUses.empty(); }
+ bool isIVUserOrOperand(Instruction *Inst) const {
+ return Processed.count(Inst);
+ }
+
void print(raw_ostream &OS, const Module* = 0) const;
/// dump - This method is used for debugging.
void dump() const;
+protected:
+ bool AddUsersImpl(Instruction *I, SmallPtrSet<Loop*,16> &SimpleLoopNests);
};
Pass *createIVUsersPass();
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