[llvm][CodeGen] Fix failure in window scheduler caused by phi#95900
Merged
[llvm][CodeGen] Fix failure in window scheduler caused by phi#95900
Conversation
In certain cases, the register passed with the kernel MBB in phi are not defined within the kernel MBB. The window algorithm currently does not support such scenarios, so a check is performed during initialization.
Contributor
Author
|
The cause of the issue is that in the phi instruction, the register passed along with the kernel MBB is not defined within the kernel MBB. We have added some handling codes. |
Contributor
Author
|
Could you please review this code? Thank you~ @nathanchance @arsenm @dtcxzyw |
arsenm
reviewed
Jun 18, 2024
llvm/lib/CodeGen/WindowScheduler.cpp
Outdated
| if (Register AntiReg = getAntiRegister(&MI)) | ||
| // Register with Kernel in phi is not defined within the Kernel itself. | ||
| if (MRI->getVRegDef(AntiReg)->getParent() != MBB) { | ||
| LLVM_DEBUG(dbgs() << "Special phi structure is not supported!\n"); |
Contributor
There was a problem hiding this comment.
It's not really special. Why is this difficult to handle? It should behave like any other live in value
Contributor
Author
There was a problem hiding this comment.
Yes, you are right. We only need to add some checks.
Updated.
arsenm
approved these changes
Jun 18, 2024
AlexisPerry
pushed a commit
to llvm-project-tlp/llvm-project
that referenced
this pull request
Jul 9, 2024
…5900) In certain cases, the register passed with the kernel MBB in phi are not defined within the kernel MBB. This patch adds the corresponding handling.
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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
In certain cases, the register passed with the kernel MBB in phi are not defined
within the kernel MBB. This patch adds the corresponding handling.