Aarch64: shorten function preludes by using pre-indexed store-pair instructions#583
Open
xavierleroy wants to merge 3 commits into
Open
Aarch64: shorten function preludes by using pre-indexed store-pair instructions#583xavierleroy wants to merge 3 commits into
xavierleroy wants to merge 3 commits into
Conversation
When applicable, this produces 2 instructions (instead of 4) for allocating the stack frame and saving the link and the return address.
Even when the stack frame is too big for a preindexed store pair, we can use a SP decrement followed by a store pair, saving one instruction.
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
1 participant
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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
In the common case (small stack frame, no stack-allocated function arguments), this saves 2 instructions per prelude. In the worst case, it's the same number of instructions as we have today.