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//===- llvm/Analysis/ScalarEvolutionDivision.h - See below ------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the class that knows how to divide SCEV's.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_SCALAREVOLUTIONDIVISION_H
#define LLVM_ANALYSIS_SCALAREVOLUTIONDIVISION_H
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
namespace llvm {
class SCEV;
class ScalarEvolution;
struct SCEVCouldNotCompute;
struct SCEVDivision : public SCEVVisitor<SCEVDivision, void> {
public:
// Computes the Quotient and Remainder of the division of Numerator by
// Denominator.
static void divide(ScalarEvolution &SE, const SCEV *Numerator,
const SCEV *Denominator, const SCEV **Quotient,
const SCEV **Remainder);
// Except in the trivial case described above, we do not know how to divide
// Expr by Denominator for the following functions with empty implementation.
void visitPtrToIntExpr(const SCEVPtrToIntExpr *Numerator) {}
void visitTruncateExpr(const SCEVTruncateExpr *Numerator) {}
void visitZeroExtendExpr(const SCEVZeroExtendExpr *Numerator) {}
void visitSignExtendExpr(const SCEVSignExtendExpr *Numerator) {}
void visitUDivExpr(const SCEVUDivExpr *Numerator) {}
void visitSMaxExpr(const SCEVSMaxExpr *Numerator) {}
void visitUMaxExpr(const SCEVUMaxExpr *Numerator) {}
void visitSMinExpr(const SCEVSMinExpr *Numerator) {}
void visitUMinExpr(const SCEVUMinExpr *Numerator) {}
void visitSequentialUMinExpr(const SCEVSequentialUMinExpr *Numerator) {}
void visitUnknown(const SCEVUnknown *Numerator) {}
void visitCouldNotCompute(const SCEVCouldNotCompute *Numerator) {}
void visitConstant(const SCEVConstant *Numerator);
void visitAddRecExpr(const SCEVAddRecExpr *Numerator);
void visitAddExpr(const SCEVAddExpr *Numerator);
void visitMulExpr(const SCEVMulExpr *Numerator);
private:
SCEVDivision(ScalarEvolution &S, const SCEV *Numerator,
const SCEV *Denominator);
// Convenience function for giving up on the division. We set the quotient to
// be equal to zero and the remainder to be equal to the numerator.
void cannotDivide(const SCEV *Numerator);
ScalarEvolution &SE;
const SCEV *Denominator, *Quotient, *Remainder, *Zero, *One;
};
} // end namespace llvm
#endif // LLVM_ANALYSIS_SCALAREVOLUTIONDIVISION_H
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