Sunday, 2020-09-20

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markus2Regarding determinism of Yosys, I have found that removing code that should not matter for synthesis ($display contained in always block) results in rather large differences in the generated JSON netlist. Which in turn cause my design to fail to meet timing constraints.11:36
markus2I assume that the iteration order of internal data structures change and that in turn cause passes to behave differently. Is this a known issue (I looked around a bit in github without finding any direct bug report)?11:37
markus2I mean it would be desirable to be generate stable output wrt such changes.11:39
markus2perhaps I should say that the always block is also removed (it only contained the $display statements) but still I would prefer if it did not change the output.11:40
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