122 lines
4.5 KiB
C++
122 lines
4.5 KiB
C++
//===---- llvm/Analysis/ScalarEvolutionExpander.h - SCEV Exprs --*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines the classes used to generate code from scalar expressions.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ANALYSIS_SCALAREVOLUTION_EXPANDER_H
|
|
#define LLVM_ANALYSIS_SCALAREVOLUTION_EXPANDER_H
|
|
|
|
#include "llvm/Analysis/ScalarEvolutionExpressions.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 destroy it when finished to allow the release of the associated
|
|
/// memory.
|
|
struct SCEVExpander : public SCEVVisitor<SCEVExpander, Value*> {
|
|
ScalarEvolution &SE;
|
|
std::map<std::pair<const SCEV *, Instruction *>, AssertingVH<Value> >
|
|
InsertedExpressions;
|
|
std::set<Value*> InsertedValues;
|
|
|
|
typedef IRBuilder<true, TargetFolder> BuilderType;
|
|
BuilderType Builder;
|
|
|
|
friend struct SCEVVisitor<SCEVExpander, Value*>;
|
|
public:
|
|
explicit SCEVExpander(ScalarEvolution &se)
|
|
: SE(se), Builder(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(); }
|
|
|
|
/// 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);
|
|
|
|
/// 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 *IP) {
|
|
Builder.SetInsertPoint(IP->getParent(), IP);
|
|
return expandCodeFor(SH, Ty);
|
|
}
|
|
|
|
private:
|
|
/// 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);
|
|
|
|
/// 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);
|
|
|
|
/// 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(const SCEVConstant *S) {
|
|
return S->getValue();
|
|
}
|
|
|
|
Value *visitTruncateExpr(const SCEVTruncateExpr *S);
|
|
|
|
Value *visitZeroExtendExpr(const SCEVZeroExtendExpr *S);
|
|
|
|
Value *visitSignExtendExpr(const SCEVSignExtendExpr *S);
|
|
|
|
Value *visitAddExpr(const SCEVAddExpr *S);
|
|
|
|
Value *visitMulExpr(const SCEVMulExpr *S);
|
|
|
|
Value *visitUDivExpr(const SCEVUDivExpr *S);
|
|
|
|
Value *visitAddRecExpr(const SCEVAddRecExpr *S);
|
|
|
|
Value *visitSMaxExpr(const SCEVSMaxExpr *S);
|
|
|
|
Value *visitUMaxExpr(const SCEVUMaxExpr *S);
|
|
|
|
Value *visitUnknown(const SCEVUnknown *S) {
|
|
return S->getValue();
|
|
}
|
|
};
|
|
}
|
|
|
|
#endif
|
|
|