usaxena95 added a comment.

My suggestion would be to properly handle cycles in 
`CheckConstraintSatisfaction`. This problem goes beyond cycles introduced by 
conversion. See #53213 <https://github.com/llvm/llvm-project/issues/53213> and 
#44304 <https://github.com/llvm/llvm-project/issues/44304> 
https://godbolt.org/z/v41ez6eW4. These two bugs are due to an assertion failure 
while inserting entry into SatisfactionCache.

My suggestion would be detect cycles in `CheckConstraintSatisfaction`. We 
already have a way to check "whether we have seen this before ?" in 
`SatisfactionCache` using `FoldingSet` for `ConstraintSatisfaction`. We could 
use a similar set to track the constraints being evaluated. Stop evaluation 
when we detect a cycle. Attach appropriate details to the Satisfaction and fail 
the constraint.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D133052/new/

https://reviews.llvm.org/D133052

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