#ifndef LLVM_ANALYSIS_SCALAREVOLUTION_H
#define LLVM_ANALYSIS_SCALAREVOLUTION_H
+#include "llvm/ADT/DenseSet.h"
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/Operator.h"
#include "llvm/Pass.h"
-#include "llvm/Instructions.h"
-#include "llvm/Function.h"
-#include "llvm/Operator.h"
-#include "llvm/Support/DataTypes.h"
-#include "llvm/Support/ValueHandle.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/ConstantRange.h"
-#include "llvm/ADT/FoldingSet.h"
-#include "llvm/ADT/DenseMap.h"
+#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/ValueHandle.h"
#include <map>
namespace llvm {
class DominatorTree;
class Type;
class ScalarEvolution;
- class TargetData;
+ class DataLayout;
+ class TargetLibraryInfo;
class LLVMContext;
class Loop;
class LoopInfo;
unsigned short SubclassData;
private:
- SCEV(const SCEV &); // DO NOT IMPLEMENT
- void operator=(const SCEV &); // DO NOT IMPLEMENT
+ SCEV(const SCEV &) LLVM_DELETED_FUNCTION;
+ void operator=(const SCEV &) LLVM_DELETED_FUNCTION;
public:
/// NoWrapFlags are bitfield indices into SubclassData.
///
bool isAllOnesValue() const;
+ /// isNonConstantNegative - Return true if the specified scev is negated,
+ /// but not a constant.
+ bool isNonConstantNegative() const;
+
/// print - Print out the internal representation of this scalar to the
/// specified stream. This should really only be used for debugging
/// purposes.
ID = X.FastID;
}
static bool Equals(const SCEV &X, const FoldingSetNodeID &ID,
- FoldingSetNodeID &TempID) {
+ unsigned IDHash, FoldingSetNodeID &TempID) {
return ID == X.FastID;
}
static unsigned ComputeHash(const SCEV &X, FoldingSetNodeID &TempID) {
SCEVCouldNotCompute();
/// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const SCEVCouldNotCompute *S) { return true; }
static bool classof(const SCEV *S);
};
/// Convenient NoWrapFlags manipulation that hides enum casts and is
/// visible in the ScalarEvolution name space.
- static SCEV::NoWrapFlags maskFlags(SCEV::NoWrapFlags Flags, int Mask) {
+ static SCEV::NoWrapFlags LLVM_ATTRIBUTE_UNUSED_RESULT
+ maskFlags(SCEV::NoWrapFlags Flags, int Mask) {
return (SCEV::NoWrapFlags)(Flags & Mask);
}
- static SCEV::NoWrapFlags setFlags(SCEV::NoWrapFlags Flags,
- SCEV::NoWrapFlags OnFlags) {
+ static SCEV::NoWrapFlags LLVM_ATTRIBUTE_UNUSED_RESULT
+ setFlags(SCEV::NoWrapFlags Flags, SCEV::NoWrapFlags OnFlags) {
return (SCEV::NoWrapFlags)(Flags | OnFlags);
}
- static SCEV::NoWrapFlags clearFlags(SCEV::NoWrapFlags Flags,
- SCEV::NoWrapFlags OffFlags) {
+ static SCEV::NoWrapFlags LLVM_ATTRIBUTE_UNUSED_RESULT
+ clearFlags(SCEV::NoWrapFlags Flags, SCEV::NoWrapFlags OffFlags) {
return (SCEV::NoWrapFlags)(Flags & ~OffFlags);
}
/// TD - The target data information for the target we are targeting.
///
- TargetData *TD;
+ DataLayout *TD;
+
+ /// TLI - The target library information for the target we are targeting.
+ ///
+ TargetLibraryInfo *TLI;
/// DT - The dominator tree.
///
///
ValueExprMapType ValueExprMap;
+ /// Mark predicate values currently being processed by isImpliedCond.
+ DenseSet<Value*> PendingLoopPredicates;
+
/// ExitLimit - Information about the number of loop iterations for
/// which a loop exit's branch condition evaluates to the not-taken path.
/// This is a temporary pair of exact and max expressions that are
/// getMax - Get the max backedge taken count for the loop.
const SCEV *getMax(ScalarEvolution *SE) const;
+ /// Return true if any backedge taken count expressions refer to the given
+ /// subexpression.
+ bool hasOperand(const SCEV *S, ScalarEvolution *SE) const;
+
/// clear - Invalidate this result and free associated memory.
void clear();
};
/// that we attempt to compute getSCEVAtScope information for, which can
/// be expensive in extreme cases.
DenseMap<const SCEV *,
- std::map<const Loop *, const SCEV *> > ValuesAtScopes;
+ SmallVector<std::pair<const Loop *, const SCEV *>, 2> > ValuesAtScopes;
/// LoopDispositions - Memoized computeLoopDisposition results.
DenseMap<const SCEV *,
- std::map<const Loop *, LoopDisposition> > LoopDispositions;
+ SmallVector<std::pair<const Loop *, LoopDisposition>, 2> > LoopDispositions;
/// computeLoopDisposition - Compute a LoopDisposition value.
LoopDisposition computeLoopDisposition(const SCEV *S, const Loop *L);
/// BlockDispositions - Memoized computeBlockDisposition results.
DenseMap<const SCEV *,
- std::map<const BasicBlock *, BlockDisposition> > BlockDispositions;
+ SmallVector<std::pair<const BasicBlock *, BlockDisposition>, 2> > BlockDispositions;
/// computeBlockDisposition - Compute a BlockDisposition value.
BlockDisposition computeBlockDisposition(const SCEV *S, const BasicBlock *BB);
/// resolution.
void ForgetSymbolicName(Instruction *I, const SCEV *SymName);
- /// getBECount - Subtract the end and start values and divide by the step,
- /// rounding up, to get the number of times the backedge is executed. Return
- /// CouldNotCompute if an intermediate computation overflows.
- const SCEV *getBECount(const SCEV *Start,
- const SCEV *End,
- const SCEV *Step,
- bool NoWrap);
-
/// getBackedgeTakenInfo - Return the BackedgeTakenInfo for the given
/// loop, lazily computing new values if the loop hasn't been analyzed
/// yet.
ExitLimit ComputeExitLimitFromCond(const Loop *L,
Value *ExitCond,
BasicBlock *TBB,
- BasicBlock *FBB);
+ BasicBlock *FBB,
+ bool IsSubExpr);
/// ComputeExitLimitFromICmp - Compute the number of times the backedge of
/// the specified loop will execute if its exit condition were a conditional
ExitLimit ComputeExitLimitFromICmp(const Loop *L,
ICmpInst *ExitCond,
BasicBlock *TBB,
- BasicBlock *FBB);
+ BasicBlock *FBB,
+ bool IsSubExpr);
/// ComputeLoadConstantCompareExitLimit - Given an exit condition
/// of 'icmp op load X, cst', try to see if we can compute the
/// HowFarToZero - Return the number of times an exit condition comparing
/// the specified value to zero will execute. If not computable, return
/// CouldNotCompute.
- ExitLimit HowFarToZero(const SCEV *V, const Loop *L);
+ ExitLimit HowFarToZero(const SCEV *V, const Loop *L, bool IsSubExpr);
/// HowFarToNonZero - Return the number of times an exit condition checking
/// the specified value for nonzero will execute. If not computable, return
/// computable, return CouldNotCompute. isSigned specifies whether the
/// less-than is signed.
ExitLimit HowManyLessThans(const SCEV *LHS, const SCEV *RHS,
- const Loop *L, bool isSigned);
+ const Loop *L, bool isSigned, bool IsSubExpr);
+ ExitLimit HowManyGreaterThans(const SCEV *LHS, const SCEV *RHS,
+ const Loop *L, bool isSigned, bool IsSubExpr);
/// getPredecessorWithUniqueSuccessorForBB - Return a predecessor of BB
/// (which may not be an immediate predecessor) which has exactly one
/// forgetMemoizedResults - Drop memoized information computed for S.
void forgetMemoizedResults(const SCEV *S);
+ /// Return false iff given SCEV contains a SCEVUnknown with NULL value-
+ /// pointer.
+ bool checkValidity(const SCEV *S) const;
+
public:
static char ID; // Pass identification, replacement for typeid
ScalarEvolution();
Ops.push_back(RHS);
return getMulExpr(Ops, Flags);
}
+ const SCEV *getMulExpr(const SCEV *Op0, const SCEV *Op1, const SCEV *Op2,
+ SCEV::NoWrapFlags Flags = SCEV::FlagAnyWrap) {
+ SmallVector<const SCEV *, 3> Ops;
+ Ops.push_back(Op0);
+ Ops.push_back(Op1);
+ Ops.push_back(Op2);
+ return getMulExpr(Ops, Flags);
+ }
const SCEV *getUDivExpr(const SCEV *LHS, const SCEV *RHS);
const SCEV *getAddRecExpr(const SCEV *Start, const SCEV *Step,
const Loop *L, SCEV::NoWrapFlags Flags);
const SCEV *getUnknown(Value *V);
const SCEV *getCouldNotCompute();
- /// getSizeOfExpr - Return an expression for sizeof on the given type.
- ///
- const SCEV *getSizeOfExpr(Type *AllocTy);
-
- /// getAlignOfExpr - Return an expression for alignof on the given type.
- ///
- const SCEV *getAlignOfExpr(Type *AllocTy);
-
- /// getOffsetOfExpr - Return an expression for offsetof on the given field.
+ /// getSizeOfExpr - Return an expression for sizeof AllocTy that is type
+ /// IntTy
///
- const SCEV *getOffsetOfExpr(StructType *STy, unsigned FieldNo);
+ const SCEV *getSizeOfExpr(Type *IntTy, Type *AllocTy);
- /// getOffsetOfExpr - Return an expression for offsetof on the given field.
+ /// getOffsetOfExpr - Return an expression for offsetof on the given field
+ /// with type IntTy
///
- const SCEV *getOffsetOfExpr(Type *CTy, Constant *FieldNo);
+ const SCEV *getOffsetOfExpr(Type *IntTy, StructType *STy, unsigned FieldNo);
/// getNegativeSCEV - Return the SCEV object corresponding to -V.
///
const SCEV *LHS, const SCEV *RHS);
/// getSmallConstantTripCount - Returns the maximum trip count of this loop
- /// as a normal unsigned value, if possible. Returns 0 if the trip count is
- /// unknown or not constant.
- unsigned getSmallConstantTripCount(Loop *L, BasicBlock *ExitBlock);
+ /// as a normal unsigned value. Returns 0 if the trip count is unknown or
+ /// not constant. This "trip count" assumes that control exits via
+ /// ExitingBlock. More precisely, it is the number of times that control may
+ /// reach ExitingBlock before taking the branch. For loops with multiple
+ /// exits, it may not be the number times that the loop header executes if
+ /// the loop exits prematurely via another branch.
+ unsigned getSmallConstantTripCount(Loop *L, BasicBlock *ExitingBlock);
/// getSmallConstantTripMultiple - Returns the largest constant divisor of
/// the trip count of this loop as a normal unsigned value, if
/// possible. This means that the actual trip count is always a multiple of
/// the returned value (don't forget the trip count could very well be zero
- /// as well!).
- unsigned getSmallConstantTripMultiple(Loop *L, BasicBlock *ExitBlock);
+ /// as well!). As explained in the comments for getSmallConstantTripCount,
+ /// this assumes that control exits the loop via ExitingBlock.
+ unsigned getSmallConstantTripMultiple(Loop *L, BasicBlock *ExitingBlock);
// getExitCount - Get the expression for the number of loop iterations for
// which this loop is guaranteed not to exit via ExitingBlock. Otherwise
/// disconnect it from a def-use chain linking it to a loop.
void forgetValue(Value *V);
+ /// \brief Called when the client has changed the disposition of values in
+ /// this loop.
+ ///
+ /// We don't have a way to invalidate per-loop dispositions. Clear and
+ /// recompute is simpler.
+ void forgetLoopDispositions(const Loop *L) { LoopDispositions.clear(); }
+
/// GetMinTrailingZeros - Determine the minimum number of zero bits that S
/// is guaranteed to end in (at every loop iteration). It is, at the same
/// time, the minimum number of times S is divisible by 2. For example,
/// SimplifyICmpOperands - Simplify LHS and RHS in a comparison with
/// predicate Pred. Return true iff any changes were made. If the
- /// operands are provably equal or inequal, LHS and RHS are set to
+ /// operands are provably equal or unequal, LHS and RHS are set to
/// the same value and Pred is set to either ICMP_EQ or ICMP_NE.
///
bool SimplifyICmpOperands(ICmpInst::Predicate &Pred,
const SCEV *&LHS,
- const SCEV *&RHS);
+ const SCEV *&RHS,
+ unsigned Depth = 0);
/// getLoopDisposition - Return the "disposition" of the given SCEV with
/// respect to the given loop.
virtual void releaseMemory();
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
virtual void print(raw_ostream &OS, const Module* = 0) const;
+ virtual void verifyAnalysis() const;
+
+ private:
+ /// Compute the backedge taken count knowing the interval difference, the
+ /// stride and presence of the equality in the comparison.
+ const SCEV *computeBECount(const SCEV *Delta, const SCEV *Stride,
+ bool Equality);
+
+ /// Verify if an linear IV with positive stride can overflow when in a
+ /// less-than comparison, knowing the invariant term of the comparison,
+ /// the stride and the knowledge of NSW/NUW flags on the recurrence.
+ bool doesIVOverflowOnLT(const SCEV *RHS, const SCEV *Stride,
+ bool IsSigned, bool NoWrap);
+
+ /// Verify if an linear IV with negative stride can overflow when in a
+ /// greater-than comparison, knowing the invariant term of the comparison,
+ /// the stride and the knowledge of NSW/NUW flags on the recurrence.
+ bool doesIVOverflowOnGT(const SCEV *RHS, const SCEV *Stride,
+ bool IsSigned, bool NoWrap);
private:
FoldingSet<SCEV> UniqueSCEVs;
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