  We utilize the joint capabilities of IBIS and SPI to perform a state-resolved
20--2000\,keV analysis of the microquasar Cygnus X-1. In both LHS and HSS, the
spectral analysis reveals the presence of a high-energy tail above 400\,keV in
addition to a standard, Compton-like continuum in the 20--400\,keV range. We
study the polarisation properties of the hard X-ray radiation, as well as of
the polarisation of this high-energy tail. Polarisation is detected in the LHS
in agreement with previous work. We find potential variations of the LHS
polarisation with time and no polarisation detection in the HSS.
