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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53217 91177308-0d34-0410-b5e6-96231b3b80d8
121 lines
4.3 KiB
C++
121 lines
4.3 KiB
C++
//===---- llvm/Analysis/ScalarEvolutionExpander.h - SCEV Exprs --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the classes used to generate code from scalar expressions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_SCALAREVOLUTION_EXPANDER_H
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#define LLVM_ANALYSIS_SCALAREVOLUTION_EXPANDER_H
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#include "llvm/Instructions.h"
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#include "llvm/Type.h"
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#include "llvm/Analysis/ScalarEvolution.h"
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#include "llvm/Analysis/ScalarEvolutionExpressions.h"
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namespace llvm {
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/// SCEVExpander - This class uses information about analyze scalars to
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/// rewrite expressions in canonical form.
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///
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/// Clients should create an instance of this class when rewriting is needed,
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/// and destroy it when finished to allow the release of the associated
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/// memory.
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struct SCEVExpander : public SCEVVisitor<SCEVExpander, Value*> {
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ScalarEvolution &SE;
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LoopInfo &LI;
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std::map<SCEVHandle, Value*> InsertedExpressions;
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std::set<Instruction*> InsertedInstructions;
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Instruction *InsertPt;
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friend struct SCEVVisitor<SCEVExpander, Value*>;
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public:
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SCEVExpander(ScalarEvolution &se, LoopInfo &li) : SE(se), LI(li) {}
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LoopInfo &getLoopInfo() const { return LI; }
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/// clear - Erase the contents of the InsertedExpressions map so that users
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/// trying to expand the same expression into multiple BasicBlocks or
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/// different places within the same BasicBlock can do so.
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void clear() { InsertedExpressions.clear(); }
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/// isInsertedInstruction - Return true if the specified instruction was
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/// inserted by the code rewriter. If so, the client should not modify the
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/// instruction.
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bool isInsertedInstruction(Instruction *I) const {
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return InsertedInstructions.count(I);
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}
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/// getOrInsertCanonicalInductionVariable - This method returns the
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/// canonical induction variable of the specified type for the specified
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/// loop (inserting one if there is none). A canonical induction variable
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/// starts at zero and steps by one on each iteration.
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Value *getOrInsertCanonicalInductionVariable(const Loop *L, const Type *Ty){
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assert(Ty->isInteger() && "Can only insert integer induction variables!");
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SCEVHandle H = SE.getAddRecExpr(SE.getIntegerSCEV(0, Ty),
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SE.getIntegerSCEV(1, Ty), L);
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return expand(H);
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}
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/// addInsertedValue - Remember the specified instruction as being the
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/// canonical form for the specified SCEV.
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void addInsertedValue(Instruction *I, SCEV *S) {
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InsertedExpressions[S] = (Value*)I;
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InsertedInstructions.insert(I);
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}
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Instruction *getInsertionPoint() const { return InsertPt; }
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/// expandCodeFor - Insert code to directly compute the specified SCEV
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/// expression into the program. The inserted code is inserted into the
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/// specified block.
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Value *expandCodeFor(SCEVHandle SH, Instruction *IP);
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/// InsertCastOfTo - Insert a cast of V to the specified type, doing what
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/// we can to share the casts.
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static Value *InsertCastOfTo(Instruction::CastOps opcode, Value *V,
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const Type *Ty);
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/// InsertBinop - Insert the specified binary operator, doing a small amount
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/// of work to avoid inserting an obviously redundant operation.
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static Value *InsertBinop(Instruction::BinaryOps Opcode, Value *LHS,
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Value *RHS, Instruction *InsertPt);
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protected:
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Value *expand(SCEV *S);
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Value *visitConstant(SCEVConstant *S) {
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return S->getValue();
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}
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Value *visitTruncateExpr(SCEVTruncateExpr *S);
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Value *visitZeroExtendExpr(SCEVZeroExtendExpr *S);
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Value *visitSignExtendExpr(SCEVSignExtendExpr *S);
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Value *visitAddExpr(SCEVAddExpr *S);
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Value *visitMulExpr(SCEVMulExpr *S);
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Value *visitUDivExpr(SCEVUDivExpr *S);
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Value *visitAddRecExpr(SCEVAddRecExpr *S);
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Value *visitSMaxExpr(SCEVSMaxExpr *S);
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Value *visitUMaxExpr(SCEVUMaxExpr *S);
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Value *visitUnknown(SCEVUnknown *S) {
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return S->getValue();
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}
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};
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}
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#endif
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