Fine Control of Local Whitespace in Placement

Figure 2

ISPD 2006 placement contest penalty for requested amounts of minimum local whitespace. We test on benchmarks from the ISPD 2006 placement contest suite [12]. These benchmarks have 29%, 38%, 74%, and 54% whitespace, respectively. Usually the penalty is very small when using our techniques (always less than 1.5%), but the penalty grows significantly as the requested whitespace approaches the amount of whitespace available in the design.