Avoid undefined behavior in Random_int by having it always return 0 for n = 0.#5206
Merged
atmyers merged 2 commits intoAMReX-Codes:developmentfrom Mar 17, 2026
Merged
Avoid undefined behavior in Random_int by having it always return 0 for n = 0.#5206atmyers merged 2 commits intoAMReX-Codes:developmentfrom
atmyers merged 2 commits intoAMReX-Codes:developmentfrom
Conversation
WeiqunZhang
approved these changes
Mar 17, 2026
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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
amrex::Random_int(0, engine)currently causes undefined behavior that was leading to a hang on Perlmutter. This avoids this by early exiting if n = 0.Summary
Additional background
Checklist
The proposed changes: