lib/VMCore/ConstantFold.h

   1 //===-- ConstantFolding.h - Internal Constant Folding Interface -*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // 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 they don't know how to perform
  15 // the specified operation on the specified constant types.
  16 //
  17 //===----------------------------------------------------------------------===//
  18
  19 #ifndef CONSTANTFOLDING_H
  20 #define CONSTANTFOLDING_H
  21
  22 namespace llvm {
  23   class Value;
  24   class Constant;
  25   class Type;
  26
  27   // Constant fold various types of instruction...
  28   Constant *ConstantFoldCastInstruction(
  29     unsigned opcode,     ///< The opcode of the cast
  30     const Constant *V,   ///< The source constant
  31     const Type *DestTy   ///< The destination type
  32   );
  33   Constant *ConstantFoldSelectInstruction(const Constant *Cond,
  34                                           const Constant *V1,
  35                                           const Constant *V2);
  36   Constant *ConstantFoldExtractElementInstruction(const Constant *Val,
  37                                                   const Constant *Idx);
  38   Constant *ConstantFoldInsertElementInstruction(const Constant *Val,
  39                                                  const Constant *Elt,
  40                                                  const Constant *Idx);
  41   Constant *ConstantFoldShuffleVectorInstruction(const Constant *V1,
  42                                                  const Constant *V2,
  43                                                  const Constant *Mask);
  44   Constant *ConstantFoldExtractValueInstruction(const Constant *Agg,
  45                                                 const unsigned *Idxs,
  46                                                 unsigned NumIdx);
  47   Constant *ConstantFoldInsertValueInstruction(const Constant *Agg,
  48                                                const Constant *Val,
  49                                                const unsigned* Idxs,
  50                                                unsigned NumIdx);
  51   Constant *ConstantFoldBinaryInstruction(unsigned Opcode, const Constant *V1,
  52                                           const Constant *V2);
  53   Constant *ConstantFoldCompareInstruction(unsigned short predicate,
  54                                            const Constant *C1,
  55                                            const Constant *C2);
  56   Constant *ConstantFoldGetElementPtr(const Constant *C,
  57                                       Constant* const *Idxs, unsigned NumIdx);
  58 } // End llvm namespace
  59
  60 #endif