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Replace outdated commands in synthesis scripts #2052

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donn opened this issue Nov 20, 2023 · 1 comment · Fixed by #2051
Closed

Replace outdated commands in synthesis scripts #2052

donn opened this issue Nov 20, 2023 · 1 comment · Fixed by #2051
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enhancement New feature or request workaround A workaround exists for this issue Yosys This issue is related to yosys

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@donn
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donn commented Nov 20, 2023

Description

First reported in #1523 (and mistakenly closed) then resurfaced as #2050:

The commands refactor and rewrite are considered broken by the Yosys team: see this comment from @jix. YosysHQ/yosys#4039 (comment)

Proposal

drf and drw are offered as "drop-in" replacements. If refactor and rewrite are in a state of disrepair, they should be replaced (at the very least for OpenLane 2.)

We are, however, weary of unintended side effects. ABC scripts tend to be… incredibly opaque and moody. This will need to be discussed.
This was referenced Nov 20, 2023
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@donn donn added enhancement New feature or request Yosys This issue is related to yosys workaround A workaround exists for this issue labels Nov 20, 2023
@donn
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donn commented Nov 20, 2023

To those looking for a workaround, the SYNTH_STRATEGY may be set to DELAY 4, which lacks the offending commands.

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enhancement New feature or request workaround A workaround exists for this issue Yosys This issue is related to yosys
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yosys/synth.tcl: migrate to newer supported drw & drf commands dlmiles/OpenLane
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