//
// 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"
+#include "llvm/Support/IRBuilder.h"
+#include "llvm/Support/TargetFolder.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<std::pair<const SCEV *, Instruction *>, AssertingVH<Value> >
+ InsertedExpressions;
+ std::set<Value*> InsertedValues;
- Instruction *InsertPt;
+ typedef IRBuilder<true, TargetFolder> BuilderType;
+ BuilderType Builder;
friend struct SCEVVisitor<SCEVExpander, Value*>;
public:
- SCEVExpander(ScalarEvolution &se, LoopInfo &li) : SE(se), LI(li) {}
+ explicit SCEVExpander(ScalarEvolution &se)
+ : SE(se), Builder(TargetFolder(se.TD, se.getContext())) {}
/// clear - Erase the contents of the InsertedExpressions map so that users
/// trying to expand the same expression into multiple BasicBlocks or
/// different places within the same BasicBlock can do so.
void clear() { InsertedExpressions.clear(); }
- /// 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 (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);
- }
-
- /// 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);
- }
+ Value *getOrInsertCanonicalInductionVariable(const Loop *L, const Type *Ty);
/// 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, Instruction *IP) {
+ Builder.SetInsertPoint(IP->getParent(), IP);
+ return expandCodeFor(SH, 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;
+ private:
+ LLVMContext *getContext() const { return SE.getContext(); }
+
+ /// 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);
- Value *V = visit(S);
- InsertedExpressions[S] = V;
- return V;
- }
+ /// 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 *expandInTy(SCEV *S, const Type *Ty) {
- Value *V = expand(S);
- if (Ty && V->getType() != Ty) {
- // FIXME: keep track of the cast instruction.
- if (Constant *C = dyn_cast<Constant>(V))
- return ConstantExpr::getCast(C, Ty);
- else if (Instruction *I = dyn_cast<Instruction>(V)) {
- // Check to see if there is already a cast. If there is, use it.
- for (Value::use_iterator UI = I->use_begin(), E = I->use_end();
- UI != E; ++UI) {
- if ((*UI)->getType() == Ty)
- if (CastInst *CI = dyn_cast<CastInst>(cast<Instruction>(*UI))) {
- BasicBlock::iterator It = I; ++It;
- if (isa<InvokeInst>(I))
- It = cast<InvokeInst>(I)->getNormalDest()->begin();
- while (isa<PHINode>(It)) ++It;
- if (It != BasicBlock::iterator(CI)) {
- // Splice the cast immediately after the operand in question.
- BasicBlock::InstListType &InstList =
- It->getParent()->getInstList();
- InstList.splice(It, CI->getParent()->getInstList(), CI);
- }
- return CI;
- }
- }
- BasicBlock::iterator IP = I; ++IP;
- if (InvokeInst *II = dyn_cast<InvokeInst>(I))
- IP = II->getNormalDest()->begin();
- while (isa<PHINode>(IP)) ++IP;
- return new CastInst(V, Ty, V->getName(), IP);
- } else {
- // FIXME: check to see if there is already a cast!
- return new CastInst(V, Ty, V->getName(), InsertPt);
- }
- }
- return V;
+ /// 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);
+
+ /// 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);
+
+ /// 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);
}
- Value *visitConstant(SCEVConstant *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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