DecompressAEBM.h

#pragma once
#ifndef PFLIB_PACKING_DECODEAEBM_H
#define PFLIB_PACKING_DECODEAEBM_H
 
#include "pflib/packing/Mask.h"
 
namespace pflib::packing {
 
template <unsigned short A, unsigned short B>
unsigned long decompressAEBM(unsigned long encoded) {
  static_assert(A + B < 12);  // arbitrary limit to avoid typos
  unsigned long mantissa = (encoded & mask<B>);
  unsigned long exponent = ((encoded >> B) & mask<A>);
  if (exponent == 0) {
    return mantissa;
  }
  unsigned long output = (((1 << B) | mantissa) << (exponent - 1));
  if (exponent > 1) {
    output |= (1 << (exponent - 2));
  }
  return output;
}
 
}  // namespace pflib::packing
 
#endif