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     Constant *V,         ///< The source constant
  31     const Type *DestTy   ///< The destination type
  32   );
  33   Constant *ConstantFoldSelectInstruction(Constant *Cond,
  34                                           Constant *V1, Constant *V2);
  35   Constant *ConstantFoldExtractElementInstruction(Constant *Val, Constant *Idx);
  36   Constant *ConstantFoldInsertElementInstruction(Constant *Val, Constant *Elt,
  37                                                  Constant *Idx);
  38   Constant *ConstantFoldShuffleVectorInstruction(Constant *V1, Constant *V2,
  39                                                  Constant *Mask);
  40   Constant *ConstantFoldExtractValueInstruction(Constant *Agg,
  41                                                 const unsigned *Idxs,
  42                                                 unsigned NumIdx);
  43   Constant *ConstantFoldInsertValueInstruction(Constant *Agg, Constant *Val,
  44                                                const unsigned *Idxs,
  45                                                unsigned NumIdx);
  46   Constant *ConstantFoldBinaryInstruction(unsigned Opcode, Constant *V1,
  47                                           Constant *V2);
  48   Constant *ConstantFoldCompareInstruction(unsigned short predicate,
  49                                            Constant *C1, Constant *C2);
  50   Constant *ConstantFoldGetElementPtr(Constant *C, bool inBounds,
  51                                       Constant* const *Idxs, unsigned NumIdx);
  52   Constant *ConstantFoldGetElementPtr(Constant *C, bool inBounds,
  53                                       Value* const *Idxs, unsigned NumIdx);
  54 } // End llvm namespace
  55
  56 #endif