My design does not work in hardware and when debugging the issue it looks like MAP has either added or lost an inversion. Are there any known problems related to incorrect inversions?
A problem has been identified where MAP sometimes performs invalid inverter pushing on KEEP HIERARCHY boundaries.
This problem has been fixed in 8.2i.
In the meantime, to work around this problem, disable the use of KEEP HIERARCHY during MAP by using the MAP command line switch "-ignore_keep_hierarchy".