//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#ifndef LLVM_ANALYSIS_SCALAREVOLUTION_EXPANDER_H
#define LLVM_ANALYSIS_SCALAREVOLUTION_EXPANDER_H
-#include "llvm/BasicBlock.h"
-#include "llvm/Constants.h"
#include "llvm/Instructions.h"
#include "llvm/Type.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
-#include "llvm/Support/CFG.h"
namespace llvm {
/// SCEVExpander - This class uses information about analyze scalars to
/// rewrite expressions in canonical form.
///
/// Clients should create an instance of this class when rewriting is needed,
- /// and destroying it when finished to allow the release of the associated
+ /// and destroy it when finished to allow the release of the associated
/// memory.
struct SCEVExpander : public SCEVVisitor<SCEVExpander, Value*> {
ScalarEvolution &SE;
- LoopInfo &LI;
- std::map<SCEVHandle, Value*> InsertedExpressions;
- std::set<Instruction*> InsertedInstructions;
+ std::map<const SCEV*, AssertingVH<Value> > InsertedExpressions;
+ std::set<Value*> InsertedValues;
- Instruction *InsertPt;
+ BasicBlock::iterator InsertPt;
friend struct SCEVVisitor<SCEVExpander, Value*>;
public:
- SCEVExpander(ScalarEvolution &se, LoopInfo &li) : SE(se), LI(li) {}
-
- LoopInfo &getLoopInfo() const { return LI; }
+ explicit SCEVExpander(ScalarEvolution &se)
+ : SE(se) {}
/// clear - Erase the contents of the InsertedExpressions map so that users
/// trying to expand the same expression into multiple BasicBlocks or
/// inserted by the code rewriter. If so, the client should not modify the
/// instruction.
bool isInsertedInstruction(Instruction *I) const {
- return InsertedInstructions.count(I);
+ return InsertedValues.count(I);
+ }
+
+ /// isInsertedExpression - Return true if the the code rewriter has a
+ /// Value* recorded for the given expression.
+ bool isInsertedExpression(const SCEV *S) const {
+ return InsertedExpressions.count(S);
}
/// 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.
- Value *getOrInsertCanonicalInductionVariable(const Loop *L, const Type *Ty){
- assert((Ty->isInteger() || Ty->isFloatingPoint()) &&
- "Can only insert integer or floating point induction variables!");
- SCEVHandle H = SCEVAddRecExpr::get(SCEVUnknown::getIntegerSCEV(0, Ty),
- SCEVUnknown::getIntegerSCEV(1, Ty), L);
- return expand(H);
- }
+ 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);
+ void addInsertedValue(Value *V, const SCEV *S) {
+ InsertedExpressions[S] = V;
+ InsertedValues.insert(V);
}
+ void setInsertionPoint(BasicBlock::iterator NewIP) { InsertPt = NewIP; }
+
+ BasicBlock::iterator getInsertionPoint() const { return InsertPt; }
+
+ /// expandCodeFor - Insert code to directly compute the specified SCEV
+ /// 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);
+
/// 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 *IP, const Type *Ty = 0) {
- // Expand the code for this SCEV.
- this->InsertPt = IP;
- return expandInTy(SH, Ty);
+ Value *expandCodeFor(const SCEV* SH, const Type *Ty,
+ BasicBlock::iterator IP) {
+ setInsertionPoint(IP);
+ return expandCodeFor(SH, Ty);
}
/// InsertCastOfTo - Insert a cast of V to the specified type, doing what
/// we can to share the casts.
- static Value *InsertCastOfTo(Value *V, const Type *Ty);
-
- protected:
- Value *expand(SCEV *S) {
- // Check to see if we already expanded this.
- std::map<SCEVHandle, Value*>::iterator I = InsertedExpressions.find(S);
- if (I != InsertedExpressions.end())
- return I->second;
-
- Value *V = visit(S);
- InsertedExpressions[S] = V;
- return V;
- }
+ Value *InsertCastOfTo(Instruction::CastOps opcode, Value *V,
+ const Type *Ty);
- Value *expandInTy(SCEV *S, const Type *Ty) {
- Value *V = expand(S);
- if (Ty && V->getType() != Ty)
- return InsertCastOfTo(V, Ty);
- return V;
- }
+ /// InsertNoopCastOfTo - Insert a cast of V to the specified type,
+ /// which must be possible with a noop cast.
+ Value *InsertNoopCastOfTo(Value *V, const Type *Ty);
+
+ /// InsertBinop - Insert the specified binary operator, doing a small amount
+ /// of work to avoid inserting an obviously redundant operation.
+ Value *InsertBinop(Instruction::BinaryOps Opcode, Value *LHS,
+ Value *RHS, BasicBlock::iterator InsertPt);
- Value *visitConstant(SCEVConstant *S) {
+ private:
+ /// 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);
+
+ Value *expand(const SCEV *S);
+
+ Value *visitConstant(const SCEVConstant *S) {
return S->getValue();
}
- Value *visitTruncateExpr(SCEVTruncateExpr *S) {
- Value *V = expand(S->getOperand());
- return new CastInst(V, S->getType(), "tmp.", InsertPt);
- }
+ Value *visitTruncateExpr(const SCEVTruncateExpr *S);
- Value *visitZeroExtendExpr(SCEVZeroExtendExpr *S) {
- Value *V = expandInTy(S->getOperand(),S->getType()->getUnsignedVersion());
- return new CastInst(V, S->getType(), "tmp.", InsertPt);
- }
+ Value *visitZeroExtendExpr(const SCEVZeroExtendExpr *S);
- Value *visitAddExpr(SCEVAddExpr *S) {
- const Type *Ty = S->getType();
- Value *V = expandInTy(S->getOperand(S->getNumOperands()-1), Ty);
+ Value *visitSignExtendExpr(const SCEVSignExtendExpr *S);
- // Emit a bunch of add instructions
- for (int i = S->getNumOperands()-2; i >= 0; --i)
- V = BinaryOperator::createAdd(V, expandInTy(S->getOperand(i), Ty),
- "tmp.", InsertPt);
- return V;
- }
+ Value *visitAddExpr(const SCEVAddExpr *S);
- Value *visitMulExpr(SCEVMulExpr *S);
+ Value *visitMulExpr(const SCEVMulExpr *S);
- Value *visitUDivExpr(SCEVUDivExpr *S) {
- const Type *Ty = S->getType();
- Value *LHS = expandInTy(S->getLHS(), Ty);
- Value *RHS = expandInTy(S->getRHS(), Ty);
- return BinaryOperator::createDiv(LHS, RHS, "tmp.", InsertPt);
- }
+ Value *visitUDivExpr(const SCEVUDivExpr *S);
+
+ Value *visitAddRecExpr(const SCEVAddRecExpr *S);
+
+ Value *visitSMaxExpr(const SCEVSMaxExpr *S);
- Value *visitAddRecExpr(SCEVAddRecExpr *S);
+ Value *visitUMaxExpr(const SCEVUMaxExpr *S);
- Value *visitUnknown(SCEVUnknown *S) {
+ Value *visitUnknown(const SCEVUnknown *S) {
return S->getValue();
}
};
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