[PATCH] D101980: [RFC] [Coroutines] Put the contents of byval argument to the frame

[Xun Li via Phabricator via llvm-commits]

lxfind added a comment.

Here is an idea:
we could introduce an intrinsics that doesn't do anything but just server the purpose of telling the compiler to not optimize out a pointer (i.e. indicating maywrite to the pointer).
And in front end, for every copy we create from the parameter, we mark the local copy with that intrinsics. This will make sure that memcpyopt will never optimize it out.


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  https://reviews.llvm.org/D101980/new/

https://reviews.llvm.org/D101980