float.hh

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/* ###
 * IP: GHIDRA
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef __CPUI_FLOATFORMAT__
#define __CPUI_FLOATFORMAT__
 
#include "xml.hh"
 
class FloatFormat {
public:
  enum floatclass {
    normalized = 0,     
    infinity = 1,       
    zero = 2,           
    nan = 3,            
    denormalized = 4        
  };
private:
  int4 size;            
  int4 signbit_pos;     
  int4 frac_pos;        
  int4 frac_size;       
  int4 exp_pos;         
  int4 exp_size;        
  int4 bias;            
  int4 maxexponent;     
  int4 decimal_precision;   
  bool jbitimplied;     
  static double createFloat(bool sign,uintb signif,int4 exp);    
  static floatclass extractExpSig(double x,bool *sgn,uintb *signif,int4 *exp);
  static bool roundToNearestEven(uintb &signif, int4 lowbitpos);
  uintb setFractionalCode(uintb x,uintb code) const;        
  uintb setSign(uintb x,bool sign) const;           
  uintb setExponentCode(uintb x,uintb code) const;      
  uintb getZeroEncoding(bool sgn) const;            
  uintb getInfinityEncoding(bool sgn) const;            
  uintb getNaNEncoding(bool sgn) const;             
  void calcPrecision(void);                 
public:
  FloatFormat(void) {}  
  FloatFormat(int4 sz); 
  int4 getSize(void) const { return size; }         
  double getHostFloat(uintb encoding,floatclass *type) const;   
  uintb getEncoding(double host) const;             
  int4 getDecimalPrecision(void) const { return decimal_precision; }    
  uintb convertEncoding(uintb encoding,const FloatFormat *formin) const;    
 
  uintb extractFractionalCode(uintb x) const;           
  bool extractSign(uintb x) const;              
  int4 extractExponentCode(uintb x) const;          
 
  // Operations on floating point values
 
  uintb opEqual(uintb a,uintb b) const;         
  uintb opNotEqual(uintb a,uintb b) const;      
  uintb opLess(uintb a,uintb b) const;          
  uintb opLessEqual(uintb a,uintb b) const;     
  uintb opNan(uintb a) const;               
  uintb opAdd(uintb a,uintb b) const;           
  uintb opDiv(uintb a,uintb b) const;           
  uintb opMult(uintb a,uintb b) const;          
  uintb opSub(uintb a,uintb b) const;           
  uintb opNeg(uintb a) const;               
  uintb opAbs(uintb a) const;               
  uintb opSqrt(uintb a) const;              
  uintb opTrunc(uintb a,int4 sizeout) const;        
  uintb opCeil(uintb a) const;              
  uintb opFloor(uintb a) const;             
  uintb opRound(uintb a) const;             
  uintb opInt2Float(uintb a,int4 sizein) const;     
  uintb opFloat2Float(uintb a,const FloatFormat &outformat) const;  
 
  void saveXml(ostream &s) const;           
  void restoreXml(const Element *el);           
};
 
#endif