1 //===-- ConstantFolding.h - Internal Constant Folding Interface -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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.
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.
17 //===----------------------------------------------------------------------===//
19 #ifndef LLVM_LIB_IR_CONSTANTFOLD_H
20 #define LLVM_LIB_IR_CONSTANTFOLD_H
23 template <typename T> class ArrayRef;
28 // Constant fold various types of instruction...
29 Constant *ConstantFoldCastInstruction(
30 unsigned opcode, ///< The opcode of the cast
31 Constant *V, ///< The source constant
32 Type *DestTy ///< The destination type
34 Constant *ConstantFoldSelectInstruction(Constant *Cond,
35 Constant *V1, Constant *V2);
36 Constant *ConstantFoldExtractElementInstruction(Constant *Val, Constant *Idx);
37 Constant *ConstantFoldInsertElementInstruction(Constant *Val, Constant *Elt,
39 Constant *ConstantFoldShuffleVectorInstruction(Constant *V1, Constant *V2,
41 Constant *ConstantFoldExtractValueInstruction(Constant *Agg,
42 ArrayRef<unsigned> Idxs);
43 Constant *ConstantFoldInsertValueInstruction(Constant *Agg, Constant *Val,
44 ArrayRef<unsigned> Idxs);
45 Constant *ConstantFoldBinaryInstruction(unsigned Opcode, Constant *V1,
47 Constant *ConstantFoldCompareInstruction(unsigned short predicate,
48 Constant *C1, Constant *C2);
49 Constant *ConstantFoldGetElementPtr(Type *Ty, Constant *C, bool inBounds,
50 ArrayRef<Constant *> Idxs);
51 Constant *ConstantFoldGetElementPtr(Type *Ty, Constant *C, bool inBounds,
52 ArrayRef<Value *> Idxs);
53 } // End llvm namespace