lib/VMCore/ConstantFold.h

   1 //===-- ConstantFolding.h - Internal Constant Folding Interface -*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by the LLVM research group and is distributed under
   6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file defines the (internal) constant folding interfaces for LLVM.  These
  11 // interfaces are used by the ConstantExpr::get* methods to automatically fold
  12 // constants when possible.
  13 //
  14 // These operators may return a null object if I don't know how to perform the
  15 // specified operation on the specified constant types.
  16 //
  17 //===----------------------------------------------------------------------===//
  18
  19 #ifndef CONSTANTFOLDING_H
  20 #define CONSTANTFOLDING_H
  21
  22 #include <vector>
  23
  24 namespace llvm {
  25   class Value;
  26   class Constant;
  27   class Type;
  28
  29   // Constant fold various types of instruction...
  30   Constant *ConstantFoldCastInstruction(const Constant *V, const Type *DestTy);
  31   Constant *ConstantFoldSelectInstruction(const Constant *Cond,
  32                                           const Constant *V1,
  33                                           const Constant *V2);
  34   Constant *ConstantFoldExtractElementInstruction(const Constant *Val,
  35                                                   const Constant *Idx);
  36   Constant *ConstantFoldInsertElementInstruction(const Constant *Val,
  37                                                  const Constant *Elt,
  38                                                  const Constant *Idx);
  39   Constant *ConstantFoldShuffleVectorInstruction(const Constant *V1,
  40                                                  const Constant *V2,
  41                                                  const Constant *Mask);
  42   Constant *ConstantFoldBinaryInstruction(unsigned Opcode, const Constant *V1,
  43                                           const Constant *V2);
  44   Constant *ConstantFoldGetElementPtr(const Constant *C,
  45                                       const std::vector<Value*> &IdxList);
  46 } // End llvm namespace
  47
  48 #endif