Make specialization of x64 zend_safe_address() for nmemb==1 #19203
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
8afec0d to
03e4f20
Compare
There are typically 3 forms of calls to this function: 1. nmemb>1, offset=0||size=0 2. nmemb=1, size>0, offset>0 3. nmemb>1, size>0, offset>0 This specializes the second form.
03e4f20 to
3987ea7
Compare
iluuu1994
approved these changes
Jul 21, 2025
| "adc $0,%1" | ||
| : "+r"(res), "+r" (m_overflow) | ||
| : "rm"(offset) | ||
| : "cc"); |
There was a problem hiding this comment.
Do we not need this clobber hint for the other branches?
There was a problem hiding this comment.
This also surprised me, I think we actually do need it. I don't know why it isn't there.
There was a problem hiding this comment.
Might make sense to backport that part.
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Outdated suggestions cannot be applied.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.
There are typically 3 forms of calls to this function:
This specializes the second form: it avoids the multiplication.
For clang, which has trouble with the
rmconstraint, it also avoids some spills in some cases.