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19f31f28d8
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241 91177308-0d34-0410-b5e6-96231b3b80d8
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
//===- llvm/Analysis/Expressions.h - Expression Analysis Utils ---*- C++ -*--=//
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//
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// This file defines a package of expression analysis utilties:
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//
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// ClassifyExpression: Analyze an expression to determine the complexity of the
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// expression, and which other variables it depends on.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_EXPRESSIONS_H
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#define LLVM_ANALYSIS_EXPRESSIONS_H
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#include <assert.h>
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class Value;
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class ConstPoolInt;
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namespace analysis {
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struct ExprType;
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// ClassifyExpression: Analyze an expression to determine the complexity of the
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// expression, and which other values it depends on.
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//
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ExprType ClassifyExpression(Value *Expr);
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// ExprType - Represent an expression of the form CONST*VAR+CONST
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// or simpler. The expression form that yields the least information about the
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// expression is just the Linear form with no offset.
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//
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struct ExprType {
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enum ExpressionType {
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Constant, // Expr is a simple constant, Offset is value
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Linear, // Expr is linear expr, Value is Var+Offset
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ScaledLinear, // Expr is scaled linear exp, Value is Scale*Var+Offset
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} ExprTy;
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const ConstPoolInt *Offset; // Offset of expr, or null if 0
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Value *Var; // Var referenced, if Linear or above (null if 0)
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const ConstPoolInt *Scale; // Scale of var if ScaledLinear expr (null if 1)
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inline ExprType(const ConstPoolInt *CPV = 0) {
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Offset = CPV; Var = 0; Scale = 0;
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ExprTy = Constant;
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}
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inline ExprType(Value *Val) {
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Var = Val; Offset = Scale = 0;
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ExprTy = Var ? Linear : Constant;
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}
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inline ExprType(const ConstPoolInt *scale, Value *var,
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const ConstPoolInt *offset) {
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Scale = scale; Var = var; Offset = offset;
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ExprTy = Scale ? ScaledLinear : (Var ? Linear : Constant);
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}
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};
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} // End namespace analysis
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#endif
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