Izaron added a comment. A builtin is considered "constexpr" if it has `E` in its attributes in `Builtins.def`.
The list of constexpr builtins is consistent, the code in `ExprConstant.cpp` (where the actual constant evaluation of builtins is being done) guards it. If builtin is not marked with `E`, it surely won't be evaluated, and vice versa - if builtin is marked but there is no code for evaluating it, there is a `llvm_unreachable`. This macro will be needed because we are making constexpr `<cmath>` and `<cstdlib>`. We will conditionally make the functions constexpr until all supported compilers have full support. We had a discussion where we found out that we need `__has_builtin_constexpr`: https://discourse.llvm.org/t/how-do-we-plan-to-make-constexpr-cmath-and-cstdlib/65930 Please read it if you wonder why we need it =) Thank you for your attention! Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D136036/new/ https://reviews.llvm.org/D136036 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
