[PATCH] D126984: [clang] Add initial support for gcc's optimize function attribute

[Stephen Long via Phabricator via cfe-commits]

steplong added a comment.

In D126984#3571573 <https://reviews.llvm.org/D126984#3571573>, @aeubanks wrote:

> IIRC in the past there was a strong preference to not have the pass manager support this sort of thing
> if you want to support this, there should be an RFC for how the optimization part of this will work as it may require invasive changes to the LLVM pass manager
>
> (if this is purely a clang frontend thing then ignore me)

Hmm, this does affect codegen, so I'm not sure if it's purely a clang frontend thing. Maybe someone else can confirm. The motivation behind this was to add support for MSVC's `pragma optimize` in D125723 <https://reviews.llvm.org/D125723>. https://docs.microsoft.com/en-us/cpp/preprocessor/optimize?view=msvc-170


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