llvm-6502/include/llvm/Analysis/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 Value;
  class TargetData;
  
  
  /// SimplifyAndInst - Given operands for an And, see if we can
  /// fold the result.  If not, this returns null.
  Value *SimplifyAndInst(Value *LHS, Value *RHS,
                         const TargetData *TD = 0);

  /// SimplifyOrInst - Given operands for an Or, see if we can
  /// fold the result.  If not, this returns null.
  Value *SimplifyOrInst(Value *LHS, Value *RHS,
                        const TargetData *TD = 0);
  
  /// SimplifyICmpInst - Given operands for an ICmpInst, see if we can
  /// fold the result.  If not, this returns null.
  Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
                          const TargetData *TD = 0);
  
  /// SimplifyFCmpInst - Given operands for an FCmpInst, see if we can
  /// fold the result.  If not, this returns null.
  Value *SimplifyFCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
                          const TargetData *TD = 0);
  

  //=== Helper functions for higher up the class hierarchy.
  
  
  /// SimplifyCmpInst - Given operands for a CmpInst, see if we can
  /// fold the result.  If not, this returns null.
  Value *SimplifyCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
                         const TargetData *TD = 0);
  
  /// SimplifyBinOp - Given operands for a BinaryOperator, see if we can
  /// fold the result.  If not, this returns null.
  Value *SimplifyBinOp(unsigned Opcode, Value *LHS, Value *RHS, 
                       const TargetData *TD = 0);
  
} // end namespace llvm

#endif