Change how new FSM generates next state values. #3751
Draft
+157
−44
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
- Reduce build times, fixing many timeouts - Reduce the size of generated IR by orders of magnitude when there are many states, as with deeply nested loops - Improve QoR 1. Caching of phi conditions in GeneratePhiCondition() reduces the size of the IR considerably. 2. The caching from #1 helps to enable the consolidation of entries added to extra_next_state_values, which ultimately feed into a priority select for the next value of the state element. The XLS back-end does much better with this reduced form, with fewer bits in the priority select, fed by ORs over multiple conditions. PiperOrigin-RevId: 859139373
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Change how new FSM generates next state values.
Caching of phi conditions in GeneratePhiCondition() reduces the size of the IR considerably.
The caching from Build failure on Ubuntu 20.04 #1 helps to enable the consolidation of entries added to extra_next_state_values, which ultimately feed into a priority select for the next value of the state element. The XLS back-end does much better with this reduced form, with fewer bits in the priority select, fed by ORs over multiple conditions.