-
Previously, the `{add,sub}{Int,Word}C#` PrimOps weren't handled in PrelRules (constant folding and algebraic simplification) at all. This implements the necessary logic, so that using these primitives isn't too punishing compared to their well-optimised, overflow-unaware counterparts. This is so that using these primitives in `enumFromThenTo @Int` can be optimized by constant folding, reducing closure sizes. Reviewers: bgamari, simonpj, hsyl20 Reviewed By: bgamari, simonpj Subscribers: AndreasK, thomie, carter GHC Trac Issues: #8763 Differential Revision: https://phabricator.haskell.org/D4605
bb338f2e