How can I perform arithmetic right shift in C in a portable way?

Question

We are writing an emulator where we need sign propagating right shift. The emulated system uses 2\'s complement numbers.

I read that the >> operat

Answer 1

This function will work no matter the machine definition of 'int', by shifting the absolute value (i.e. without the sign) and then adding the sign:

int shift(int value, int count)
{
  return ((value > 0) - (value < 0)) * (abs(value) >> count);
}