On Mon, 20 Jul 2020 at 08:21, Serge Guelton via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > I agree. If a pass modifies the IR in any way, even temporarily, it was changed (at some point). > I'd like to +1, but when doing the migration of the code base to enable the associated expensive check, I found situations where (B) was used. For example CodeGenPrepare has a TypePromotionTransaction class which is specifically designed to let you modify the IR, then roll back those modifications and return false. Jay.
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