Beginning with the 2015.3 release, Physical Optimization has the capability to "replay"
optimization using an interactive Tcl command iphys_opt_design. The
iphys_opt_design command describes a specific optimization
occurrence, such as a the replication of a critical cell or the pulling of a set of
registers from a block RAM. The command includes all the information necessary to
recreate both the netlist and the placement changes required for the optimization
occurrence.
Interactive physical optimization can be used in two ways:
- Applying post-placement physical optimizations to the pre-placement netlist to improve the overall placement result and improve design performance.
- Saving the physical optimizations in a Tcl script to be repeated as needed