8000 [HWCleanUp] Don't fuse always_comb by uenoku · Pull Request #5175 · llvm/circt · GitHub
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[HWCleanUp] Don't fuse always_comb #5175

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Merged
merged 1 commit into from
May 23, 2023
Merged

[HWCleanUp] Don't fuse always_comb #5175

merged 1 commit into from
May 23, 2023

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uenoku
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@uenoku uenoku commented May 11, 2023

It's illegal to merge different always_comb as it might implicitly have data dependency each other. Fix #5171

@uenoku uenoku changed the title [HWCleanUp] Remove always_comb [HWCleanUp] Don't fuse always_comb May 11, 2023
@mikeurbach
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8000

I think it's reasonable to just remove it for now. We could also file a ticket to potentially add it back with more in-depth analysis about what fusion is legal, since it might still be possible in some cases.

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uenoku commented May 17, 2023

Yes, I think it would require very complicated analysis to safely fuse the always comb blocks in general. So I'd like to just remove the optimization for the correctness for now.

@rsetaluri
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@uenoku is this ready to be merged?

@uenoku uenoku merged commit e780e3e into main May 23, 2023
@uenoku uenoku deleted the dev/hidetou/always-comb branch May 23, 2023 16:20
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uenoku commented May 23, 2023

Yes, thank you for pinging me!

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[ExportVerilog] Option to disable always comb fusion
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