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   struct LLVMContext;
  27
  28   // Constant fold various types of instruction...
  29   Constant *ConstantFoldCastInstruction(
  30     LLVMContext &Context,
  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(LLVMContext &Context,
  36                                           const Constant *Cond,
  37                                           const Constant *V1,
  38                                           const Constant *V2);
  39   Constant *ConstantFoldExtractElementInstruction(LLVMContext &Context,
  40                                                   const Constant *Val,
  41                                                   const Constant *Idx);
  42   Constant *ConstantFoldInsertElementInstruction(LLVMContext &Context,
  43                                                  const Constant *Val,
  44                                                  const Constant *Elt,
  45                                                  const Constant *Idx);
  46   Constant *ConstantFoldShuffleVectorInstruction(LLVMContext &Context,
  47                                                  const Constant *V1,
  48                                                  const Constant *V2,
  49                                                  const Constant *Mask);
  50   Constant *ConstantFoldExtractValueInstruction(LLVMContext &Context,
  51                                                 const Constant *Agg,
  52                                                 const unsigned *Idxs,
  53                                                 unsigned NumIdx);
  54   Constant *ConstantFoldInsertValueInstruction(LLVMContext &Context,
  55                                                const Constant *Agg,
  56                                                const Constant *Val,
  57                                                const unsigned* Idxs,
  58                                                unsigned NumIdx);
  59   Constant *ConstantFoldBinaryInstruction(LLVMContext &Context,
  60                                           unsigned Opcode, const Constant *V1,
  61                                           const Constant *V2);
  62   Constant *ConstantFoldCompareInstruction(LLVMContext &Context,
  63                                            unsigned short predicate,
  64                                            const Constant *C1,
  65                                            const Constant *C2);
  66   Constant *ConstantFoldGetElementPtr(LLVMContext &Context, const Constant *C,
  67                                       Constant* const *Idxs, unsigned NumIdx);
  68 } // End llvm namespace
  69
  70 #endif