The majority of configurations in version 9.1 have unchanged numerical behavior compared to version 9.0.
The exception is the Pipelined Streaming I/O architecture when configured in Block Floating-Point scaling mode. In this case, the output data may no longer be bit accurate with previous versions due to the introduction of a rounding stage. The IP remains bit accurate with the C model, however user test vectors generated from earlier versions of the C model or IP may require updating to match the new behavior.