mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-19 19:30:10 +00:00
dd298c8c6e
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12294 91177308-0d34-0410-b5e6-96231b3b80d8
64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
//===- llvm/Analysis/Expressions.h - Expression Analysis Utils --*- C++ -*-===//
|
|
//
|
|
// 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 defines a package of expression analysis utilties:
|
|
//
|
|
// ClassifyExpr: Analyze an expression to determine the complexity of the
|
|
// expression, and which other variables it depends on.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ANALYSIS_EXPRESSIONS_H
|
|
#define LLVM_ANALYSIS_EXPRESSIONS_H
|
|
|
|
namespace llvm {
|
|
|
|
class Type;
|
|
class Value;
|
|
class ConstantInt;
|
|
|
|
struct ExprType;
|
|
|
|
/// ClassifyExpr - Analyze an expression to determine the complexity of the
|
|
/// expression, and which other values it depends on.
|
|
///
|
|
ExprType ClassifyExpr(Value *Expr);
|
|
|
|
/// ExprType Class - Represent an expression of the form CONST*VAR+CONST
|
|
/// or simpler. The expression form that yields the least information about the
|
|
/// expression is just the Linear form with no offset.
|
|
///
|
|
struct ExprType {
|
|
enum ExpressionType {
|
|
Constant, // Expr is a simple constant, Offset is value
|
|
Linear, // Expr is linear expr, Value is Var+Offset
|
|
ScaledLinear, // Expr is scaled linear exp, Value is Scale*Var+Offset
|
|
} ExprTy;
|
|
|
|
const ConstantInt *Offset; // Offset of expr, or null if 0
|
|
Value *Var; // Var referenced, if Linear or above (null if 0)
|
|
const ConstantInt *Scale; // Scale of var if ScaledLinear expr (null if 1)
|
|
|
|
inline ExprType(const ConstantInt *CPV = 0) {
|
|
Offset = CPV; Var = 0; Scale = 0;
|
|
ExprTy = Constant;
|
|
}
|
|
ExprType(Value *Val); // Create a linear or constant expression
|
|
ExprType(const ConstantInt *scale, Value *var, const ConstantInt *offset);
|
|
|
|
/// If this expression has an intrinsic type, return it. If it is zero,
|
|
/// return the specified type.
|
|
///
|
|
const Type *getExprType(const Type *Default) const;
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|