[PATCH] D81678: Introduce frozen attribute at call sites for stricter poison analysis

[Evgenii Stepanov via Phabricator via llvm-commits]

eugenis added a comment.

>> Also, what's the plan to detect these cases in ubsan?
> 
> I don't think this has any practical impact on our goals with sanitizers.  We should detect undefined behavior before it gets to the point of actually passing or returning an undef or poison value.

MSan will take advantage of this by validating no-undef at runtime before the function call. This will detect more bugs, as well as detect existing bugs earlier, making them easier to reason about.

I'm not sure how we could use this information in ubsan.


Repository:
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  https://reviews.llvm.org/D81678/new/

https://reviews.llvm.org/D81678