Constant COMPARATIVE_SYNTH_STRATEGY 

pub const COMPARATIVE_SYNTH_STRATEGY: SynthStrategy;

The synthesis script of a comparative block (ClosureSettings::comparative) whose caller names none. OpenLane hands abc the clock period as its target, and an area script recovers area down to it, so a run at a period longer than the design needs closes a netlist slower than the design: the period it closes at says more about the period it was given than about the design. A delay script maps every candidate for speed. MEASURED by the clock-push search over the signed blocks under DELAY 0 (logs/clock-push, 10-17): decision_hft_bist 15.0 -> 4.4 ns, dram_executor 10.5 -> 5.0, cgra_sumto 18 -> 6.4, rev_alu_core 14.5 -> 7.7.