InstructionSimplify.h

//===-- InstructionSimplify.h - Fold instructions into simpler forms ------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares routines for folding instructions into simpler forms that
// do not require creating new instructions.  For example, this does constant
// folding, and can handle identities like (X&0)->0.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H
#define LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H

namespace llvm {
  class Instruction;
  class Value;
  class TargetData;

  Value *SimplifyAddInst(Value *LHS, Value *RHS, bool isNSW, bool isNUW,
                         const TargetData *TD = 0);
  
  Value *SimplifyAndInst(Value *LHS, Value *RHS,
                         const TargetData *TD = 0);

  Value *SimplifyOrInst(Value *LHS, Value *RHS,
                        const TargetData *TD = 0);
  
  Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
                          const TargetData *TD = 0);
  
  Value *SimplifyFCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
                          const TargetData *TD = 0);
  

  Value *SimplifyGEPInst(Value * const *Ops, unsigned NumOps,
                         const TargetData *TD = 0);
  
  //=== Helper functions for higher up the class hierarchy.
  
  
  Value *SimplifyCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
                         const TargetData *TD = 0);
  
  Value *SimplifyBinOp(unsigned Opcode, Value *LHS, Value *RHS, 
                       const TargetData *TD = 0);
  
  Value *SimplifyInstruction(Instruction *I, const TargetData *TD = 0);
  
  
  void ReplaceAndSimplifyAllUses(Instruction *From, Value *To,
                                 const TargetData *TD = 0);
} // end namespace llvm

#endif

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