gh-126612: Reserve an extra word on the stack as scratch space for uops #126613
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
UOPs may want to pass values on the stack for consumption by subsequent uops. This works if the generic opcode has a positive stack effect, but may not be possible otherwise. As a simple solution, always reserve space for one extra word on the stack.
mpage
requested review from
ericsnowcurrently,
markshannon and
iritkatriel
as code owners
|
Closed in favor of #126894 |
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Outdated suggestions cannot be applied.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.
uops may want to pass values on the stack for consumption by subsequent uops. This works if the generic opcode has a stack effect greater than the number of values being passed, but may not be possible otherwise.
As a simple compromise, reserve space for one extra word on the stack, ensuring it's always safe to pass a single value.