aboutsummaryrefslogtreecommitdiffstats
path: root/lib/VMCore/ConstantFold.h
blob: 49aea11870afb7732d99085f9973e3e366e6edfd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
//===-- ConstantFolding.h - Internal Constant Folding Interface -*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the (internal) constant folding interfaces for LLVM.  These
// interfaces are used by the ConstantExpr::get* methods to automatically fold
// constants when possible.
//
// These operators may return a null object if they don't know how to perform
// the specified operation on the specified constant types.
//
//===----------------------------------------------------------------------===//

#ifndef CONSTANTFOLDING_H
#define CONSTANTFOLDING_H

namespace llvm {
  class Value;
  class Constant;
  class Type;

  // Constant fold various types of instruction...
  Constant *ConstantFoldCastInstruction(
    unsigned opcode,     ///< The opcode of the cast
    const Constant *V,   ///< The source constant
    const Type *DestTy   ///< The destination type
  );
  Constant *ConstantFoldSelectInstruction(const Constant *Cond,
                                          const Constant *V1,
                                          const Constant *V2);
  Constant *ConstantFoldExtractElementInstruction(const Constant *Val,
                                                  const Constant *Idx);
  Constant *ConstantFoldInsertElementInstruction(const Constant *Val,
                                                 const Constant *Elt,
                                                 const Constant *Idx);
  Constant *ConstantFoldShuffleVectorInstruction(const Constant *V1,
                                                 const Constant *V2,
                                                 const Constant *Mask);
  Constant *ConstantFoldExtractValueInstruction(const Constant *Agg,
                                                const unsigned *Idxs,
                                                unsigned NumIdx);
  Constant *ConstantFoldInsertValueInstruction(const Constant *Agg,
                                               const Constant *Val,
                                               const unsigned* Idxs,
                                               unsigned NumIdx);
  Constant *ConstantFoldBinaryInstruction(unsigned Opcode, const Constant *V1,
                                          const Constant *V2);
  Constant *ConstantFoldCompareInstruction(unsigned short predicate, 
                                           const Constant *C1, 
                                           const Constant *C2);
  Constant *ConstantFoldGetElementPtr(const Constant *C,
                                      Constant* const *Idxs, unsigned NumIdx);
} // End llvm namespace

#endif