FloatCompressor.h

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// Dear emacs, this is -*- c++ -*-
 
/*
  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
*/
 
// $Id: FloatCompressor.h 789425 2016-12-13 10:50:12Z krasznaa $
#ifndef CXXUTILS_FLOATCOMPRESSOR_H
#define CXXUTILS_FLOATCOMPRESSOR_H
 
// System include(s):
extern "C" {
#   include <stdint.h>
}
 
namespace CxxUtils {

   class FloatCompressor {
 
   public:
      FloatCompressor( unsigned int mantissaBits = 7 );

      float reduceFloatPrecision( float value ) const;

      union floatint_t {
         float fvalue;
         uint32_t ivalue;
      };
 
   private:
      unsigned int m_mantissaBits;
      uint32_t m_mantissaBitmask;

 
      // Half of the LSB-value after cutting the lower 32 - Ntotal bits
      uint32_t m_rounding;
      uint32_t m_vmax;

 
   }; // class FloatCompressor
 
} // namespace CxxUtils
 
#endif // CXXUTILS_FLOATCOMPRESSOR_H