macc: Stop using the B port #4817
Open
Conversation
This file contains 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
The B port is for single-bit summands. These can just as well be represented as an additional summand on the A port (which supports summands of arbitrary width). An upcoming `$macc_v2` cell won't be special-casing single-bit summands in any way. In preparation, make the following changes: * remove the `bit_ports` field from the `Macc` helper (instead add any single-bit summands to `ports` next to other summands) * leave `B` empty on cells emitted from `Macc::to_cell`
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Outdated suggestions cannot be applied.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.
What are the reasons/motivation for this change?
Explain how this is achieved.
The B port is for single-bit summands. These can just as well be represented as an additional summand on the A port (which supports summands of arbitrary width). An upcoming
$macc_v2cell won't be special-casing single-bit summands in any way.In preparation, make the following changes:
remove the
bit_portsfield from theMacchelper (instead add any single-bit summands toportsnext to other summands)leave
Bempty on cells emitted fromMacc::to_cellIf applicable, please suggest to reviewers how they can test the change.
An included test makes sure we interpret the B port on existing RTLIL exports.