codegen/new: optimize ROL/ROR flag rebuild#7126
Merged
Cacodemon345 merged 1 commit intoMay 10, 2026
Merged
Conversation
Add flags_rebuild_zpna() that materializes only ZF/NF/PF/AF, skipping the expensive CF_SET() and VF_SET() computations. Use it in all 28 ROL/ROR dynarec paths, since FLAGS_ROLxx/RORxx compute CF and VF lazily from flags_res and only need Z/N/P/A from cpu_state.flags.
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
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
Summary
This makes ROL/ROR instructions cheaper:
Add flags_rebuild_zpna() that materializes only ZF/NF/PF/AF, skipping the expensive CF_SET() and VF_SET() computations. Use it in all 28 ROL/ROR dynarec paths, since FLAGS_ROLxx/RORxx compute CF and VF lazily from flags_res and only need Z/N/P/A from cpu_state.flags.
Checklist