[PATCH] D76096: [clang] allow const structs to be constant expressions in initializer lists

[Nick Desaulniers via Phabricator via cfe-commits]

nickdesaulniers planned changes to this revision.
nickdesaulniers added a comment.

> The performance implications of deleting those lines is the complicated part.

Where does compile time performance suffer from this? I guess if we have massive array initializers, or large struct definitions, or deeply nested struct definitions, it might take time to recursively evaluate if all members are constant expressions; but isn't that what I want as a developer, to offload the calculations to compile time rather than runtime?  Or is the cost way too significant?  Looks like @rsmith added those comments/checks back in 2012 via commit dafff947599e ("constexpr irgen: Add irgen support for APValue::Struct, APValue::Union,").

Let me see if I comment out the code I've added, then modify those two spots in ExprConstant.cpp you pointed out, if that works as well.


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  https://reviews.llvm.org/D76096/new/

https://reviews.llvm.org/D76096