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 <iterator>
  23
  24 namespace llvm {
  25   class Value;
  26   class Constant;
  27   class Type;
  28
  29   // Constant fold various types of instruction...
  30   Constant *ConstantFoldCastInstruction(
  31     unsigned opcode,     ///< The opcode of the cast
  32     const Constant *V,   ///< The source constant
  33     const Type *DestTy   ///< The destination type
  34   );
  35   Constant *ConstantFoldSelectInstruction(const Constant *Cond,
  36                                           const Constant *V1,
  37                                           const Constant *V2);
  38   Constant *ConstantFoldExtractElementInstruction(const Constant *Val,
  39                                                   const Constant *Idx);
  40   Constant *ConstantFoldInsertElementInstruction(const Constant *Val,
  41                                                  const Constant *Elt,
  42                                                  const Constant *Idx);
  43   Constant *ConstantFoldShuffleVectorInstruction(const Constant *V1,
  44                                                  const Constant *V2,
  45                                                  const Constant *Mask);
  46   Constant *ConstantFoldBinaryInstruction(unsigned Opcode, const Constant *V1,
  47                                           const Constant *V2);
  48   Constant *ConstantFoldCompareInstruction(unsigned short predicate,
  49                                            const Constant *C1,
  50                                            const Constant *C2);
  51
  52   Constant *ConstantFoldGetElementPtr(const Constant *C,
  53                                       Constant* const *Idxs, unsigned NumIdx);
  54 } // End llvm namespace
  55
  56 #endif