I'm wondering if the max fanout default = 5 setting is considered at all. For example, the default regression output of the zipdiv design shows fanouts > 10 (for all synthesis results):
Report: _2003_: 65
Report: _1968_: 68
Report: _0081_: 32
Report: pre_sign: 68
Report: r_busy: 65
Eventually the reason for the slow design performance. I see similar problems on other designs.
10/23/2021, 10:43 AM
Its initial run. During resizer design those high fanout values will be optimized as per given value.
10/23/2021, 10:44 AM
So zipdiv.synthesis_preroute.v is not the golden netlist after abc fanout optimization ?
10/23/2021, 10:58 AM
Please file a GitHub issue with source files and logs
as per configuration files standard cells fanout should be 6 and clock buffer fanout is 20. If its more than that design not optimized properly