//
// 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"
+#include <set>
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 destroy 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) {}
-
- LoopInfo &getLoopInfo() const { return LI; }
+ explicit SCEVExpander(ScalarEvolution &se)
+ : SE(se), Builder(se.getContext(), TargetFolder(se.TD)) {}
/// 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() && "Can only insert integer induction variables!");
- SCEVHandle H = SE.getAddRecExpr(SE.getIntegerSCEV(0, Ty),
- SE.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);
- }
-
- Instruction *getInsertionPoint() const { return InsertPt; }
-
/// expandCodeFor - Insert code to directly compute the specified SCEV
/// expression into the program. The inserted code is inserted into the
/// specified block.
- Value *expandCodeFor(SCEVHandle SH, Instruction *IP) {
- // Expand the code for this SCEV.
- this->InsertPt = IP;
- return expand(SH);
+ Value *expandCodeFor(const SCEV *SH, const Type *Ty, Instruction *IP) {
+ Builder.SetInsertPoint(IP->getParent(), 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(Instruction::CastOps opcode, Value *V,
- const Type *Ty);
+ 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.
- static Value *InsertBinop(Instruction::BinaryOps Opcode, Value *LHS,
- Value *RHS, Instruction *&InsertPt);
- protected:
- Value *expand(SCEV *S);
-
- Value *visitConstant(SCEVConstant *S) {
- return S->getValue();
- }
+ Value *InsertBinop(Instruction::BinaryOps Opcode, Value *LHS, Value *RHS);
- Value *visitTruncateExpr(SCEVTruncateExpr *S) {
- Value *V = expand(S->getOperand());
- return CastInst::createTruncOrBitCast(V, S->getType(), "tmp.", InsertPt);
- }
+ /// 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);
+
+ /// 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 *visitZeroExtendExpr(SCEVZeroExtendExpr *S) {
- Value *V = expand(S->getOperand());
- return CastInst::createZExtOrBitCast(V, S->getType(), "tmp.", 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);
+
+ /// 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 *visitSignExtendExpr(SCEVSignExtendExpr *S) {
- Value *V = expand(S->getOperand());
- return CastInst::createSExtOrBitCast(V, S->getType(), "tmp.", InsertPt);
+ Value *visitConstant(const SCEVConstant *S) {
+ return S->getValue();
}
- Value *visitAddExpr(SCEVAddExpr *S) {
- Value *V = expand(S->getOperand(S->getNumOperands()-1));
+ Value *visitTruncateExpr(const SCEVTruncateExpr *S);
- // Emit a bunch of add instructions
- for (int i = S->getNumOperands()-2; i >= 0; --i)
- V = InsertBinop(Instruction::Add, V, expand(S->getOperand(i)),
- InsertPt);
- return V;
- }
+ Value *visitZeroExtendExpr(const SCEVZeroExtendExpr *S);
- Value *visitMulExpr(SCEVMulExpr *S);
+ Value *visitSignExtendExpr(const SCEVSignExtendExpr *S);
- Value *visitSDivExpr(SCEVSDivExpr *S) {
- Value *LHS = expand(S->getLHS());
- Value *RHS = expand(S->getRHS());
- return InsertBinop(Instruction::SDiv, LHS, RHS, InsertPt);
- }
+ Value *visitAddExpr(const SCEVAddExpr *S);
+
+ Value *visitMulExpr(const SCEVMulExpr *S);
+
+ Value *visitUDivExpr(const SCEVUDivExpr *S);
- Value *visitAddRecExpr(SCEVAddRecExpr *S);
+ Value *visitAddRecExpr(const SCEVAddRecExpr *S);
- Value *visitSMaxExpr(SCEVSMaxExpr *S);
+ Value *visitSMaxExpr(const SCEVSMaxExpr *S);
- Value *visitUnknown(SCEVUnknown *S) {
+ Value *visitUMaxExpr(const SCEVUMaxExpr *S);
+
+ Value *visitFieldOffsetExpr(const SCEVFieldOffsetExpr *S);
+
+ Value *visitAllocSizeExpr(const SCEVAllocSizeExpr *S);
+
+ Value *visitUnknown(const SCEVUnknown *S) {
return S->getValue();
}
};
}
#endif
-