//
//===----------------------------------------------------------------------===//
-#ifndef LLVM_ANALYSIS_SCALAREVOLUTION_EXPANDER_H
-#define LLVM_ANALYSIS_SCALAREVOLUTION_EXPANDER_H
+#ifndef LLVM_ANALYSIS_SCALAREVOLUTIONEXPANDER_H
+#define LLVM_ANALYSIS_SCALAREVOLUTIONEXPANDER_H
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
#include "llvm/Analysis/ScalarEvolutionNormalization.h"
-#include "llvm/Support/IRBuilder.h"
+#include "llvm/IR/IRBuilder.h"
#include "llvm/Support/TargetFolder.h"
#include "llvm/Support/ValueHandle.h"
#include <set>
namespace llvm {
+ class TargetTransformInfo;
+
+ /// Return true if the given expression is safe to expand in the sense that
+ /// all materialized values are safe to speculate.
+ bool isSafeToExpand(const SCEV *S);
+
/// SCEVExpander - This class uses information about analyze scalars to
/// rewrite expressions in canonical form.
///
/// memory.
class SCEVExpander : public SCEVVisitor<SCEVExpander, Value*> {
ScalarEvolution &SE;
+
+ // New instructions receive a name to identifies them with the current pass.
+ const char* IVName;
+
std::map<std::pair<const SCEV *, Instruction *>, AssertingVH<Value> >
InsertedExpressions;
std::set<AssertingVH<Value> > InsertedValues;
/// insert the IV increment at this position.
Instruction *IVIncInsertPos;
+ /// Phis that complete an IV chain. Reuse
+ std::set<AssertingVH<PHINode> > ChainedPhis;
+
/// CanonicalMode - When true, expressions are expanded in "canonical"
/// form. In particular, addrecs are expanded as arithmetic based on
/// a canonical induction variable. When false, expression are expanded
/// in a more literal form.
bool CanonicalMode;
+ /// When invoked from LSR, the expander is in "strength reduction" mode. The
+ /// only difference is that phi's are only reused if they are already in
+ /// "expanded" form.
+ bool LSRMode;
+
typedef IRBuilder<true, TargetFolder> BuilderType;
BuilderType Builder;
+#ifndef NDEBUG
+ const char *DebugType;
+#endif
+
friend struct SCEVVisitor<SCEVExpander, Value*>;
public:
/// SCEVExpander - Construct a SCEVExpander in "canonical" mode.
- explicit SCEVExpander(ScalarEvolution &se)
- : SE(se), IVIncInsertLoop(0), CanonicalMode(true),
- Builder(se.getContext(), TargetFolder(se.TD)) {}
+ explicit SCEVExpander(ScalarEvolution &se, const char *name)
+ : SE(se), IVName(name), IVIncInsertLoop(0), IVIncInsertPos(0),
+ CanonicalMode(true), LSRMode(false),
+ Builder(se.getContext(), TargetFolder(se.TD)) {
+#ifndef NDEBUG
+ DebugType = "";
+#endif
+ }
+
+#ifndef NDEBUG
+ void setDebugType(const char* s) { DebugType = s; }
+#endif
/// clear - Erase the contents of the InsertedExpressions map so that users
/// trying to expand the same expression into multiple BasicBlocks or
InsertedExpressions.clear();
InsertedValues.clear();
InsertedPostIncValues.clear();
+ ChainedPhis.clear();
}
/// getOrInsertCanonicalInductionVariable - This method returns the
/// canonical induction variable of the specified type for the specified
/// loop (inserting one if there is none). A canonical induction variable
/// starts at zero and steps by one on each iteration.
- PHINode *getOrInsertCanonicalInductionVariable(const Loop *L,
- const Type *Ty);
+ PHINode *getOrInsertCanonicalInductionVariable(const Loop *L, Type *Ty);
+
+ /// getIVIncOperand - Return the induction variable increment's IV operand.
+ Instruction *getIVIncOperand(Instruction *IncV, Instruction *InsertPos,
+ bool allowScale);
+
+ /// hoistIVInc - Utility for hoisting an IV increment.
+ bool hoistIVInc(Instruction *IncV, Instruction *InsertPos);
+
+ /// replaceCongruentIVs - replace congruent phis with their most canonical
+ /// representative. Return the number of phis eliminated.
+ unsigned replaceCongruentIVs(Loop *L, const DominatorTree *DT,
+ SmallVectorImpl<WeakVH> &DeadInsts,
+ const TargetTransformInfo *TTI = NULL);
/// expandCodeFor - Insert code to directly compute the specified SCEV
/// expression into the program. The inserted code is inserted into the
/// specified block.
- Value *expandCodeFor(const SCEV *SH, const Type *Ty, Instruction *I);
+ Value *expandCodeFor(const SCEV *SH, Type *Ty, Instruction *I);
/// setIVIncInsertPos - Set the current IV increment loop and position.
void setIVIncInsertPos(const Loop *L, Instruction *Pos) {
/// is useful for late optimization passes.
void disableCanonicalMode() { CanonicalMode = false; }
+ void enableLSRMode() { LSRMode = true; }
+
/// clearInsertPoint - Clear the current insertion point. This is useful
/// if the instruction that had been serving as the insertion point may
/// have been deleted.
Builder.ClearInsertionPoint();
}
+ /// 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 InsertedValues.count(I) || InsertedPostIncValues.count(I);
+ }
+
+ void setChainedPhi(PHINode *PN) { ChainedPhis.insert(PN); }
+
private:
LLVMContext &getContext() const { return SE.getContext(); }
/// reusing an existing cast if a suitable one exists, moving an existing
/// cast if a suitable one exists but isn't in the right place, or
/// or creating a new one.
- Value *ReuseOrCreateCast(Value *V, const Type *Ty,
+ Value *ReuseOrCreateCast(Value *V, Type *Ty,
Instruction::CastOps Op,
BasicBlock::iterator IP);
/// InsertNoopCastOfTo - Insert a cast of V to the specified type,
/// which must be possible with a noop cast, doing what we can to
/// share the casts.
- Value *InsertNoopCastOfTo(Value *V, const Type *Ty);
+ Value *InsertNoopCastOfTo(Value *V, Type *Ty);
/// expandAddToGEP - Expand a SCEVAddExpr with a pointer type into a GEP
/// instead of using ptrtoint+arithmetic+inttoptr.
Value *expandAddToGEP(const SCEV *const *op_begin,
const SCEV *const *op_end,
- const PointerType *PTy, const Type *Ty, Value *V);
+ PointerType *PTy, Type *Ty, Value *V);
Value *expand(const SCEV *S);
/// expression into the program. The inserted code is inserted into the
/// SCEVExpander's current insertion point. If a type is specified, the
/// result will be expanded to have that type, with a cast if necessary.
- Value *expandCodeFor(const SCEV *SH, const Type *Ty = 0);
-
- /// 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 InsertedValues.count(I) || InsertedPostIncValues.count(I);
- }
+ Value *expandCodeFor(const SCEV *SH, Type *Ty = 0);
/// getRelevantLoop - Determine the most "relevant" loop for the given SCEV.
const Loop *getRelevantLoop(const SCEV *);
void restoreInsertPoint(BasicBlock *BB, BasicBlock::iterator I);
+ bool isNormalAddRecExprPHI(PHINode *PN, Instruction *IncV, const Loop *L);
+
+ bool isExpandedAddRecExprPHI(PHINode *PN, Instruction *IncV, const Loop *L);
+
Value *expandAddRecExprLiterally(const SCEVAddRecExpr *);
PHINode *getAddRecExprPHILiterally(const SCEVAddRecExpr *Normalized,
const Loop *L,
- const Type *ExpandTy,
- const Type *IntTy);
+ Type *ExpandTy,
+ Type *IntTy);
+ Value *expandIVInc(PHINode *PN, Value *StepV, const Loop *L,
+ Type *ExpandTy, Type *IntTy, bool useSubtract);
};
}
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