About the routing hotspots different from quartus 16.0.2 to quartus 18.0.0

Hi all,

For the same quartus project,

I found that the routing hotspots is different for the pof file got from V16.0 and V18.0, as follow two pictures :

v18.0

V16.0

From above two picture, the routing hotspots got from V16.0 is better compared to the one got V18.0 (many part exceeds 95%), I compared the advanced settings of these two version software:

For synthesis:

For V16.0, it has "Synthesis migration checks for stratix 10 " and V18.0 has no this item;

For V18.0, it has "Allow Register Dupilation" and "Allow Register Merging" and V16.0 does not see these item (maybe it enable these defaultly)

For advanced fitter,

For V16.0, it has " i/o placement optimization" and " Spectra-Q physical Synthesis" and V18.0 has no these item;

For V18.0, it has " Allow register Dupilation" and "Allow Register Merging" and V16.0 has no these item(maybe it enable these defaultly).

Besides above difference, other item is same for V16.0 and V18.0.

So, For V18.0, I closed the "Allow register Dupilation" and "Allow Register Mergin" Item, but the routing hotspots change more worse.

Could you tell me the difference for the complication between V16.0 and V18.0, and is there solution for that I can got the routing hotspots (got V18.0) same as V16.0?

FPGA : 10AX115N2F45E1SG

Brs,

Lambert