tejohnson added a subscriber: yamauchi.
tejohnson added a comment.

Previously @yamauchi did a bunch of work related to this called PGSO (Profile 
Guided Size Optimization). See the functions in 
https://github.com/llvm-mirror/llvm/blob/master/lib/Transforms/Utils/SizeOpts.cpp,
 which are used to guide a number of optimizations that can affect code size. 
Do you know why those weren't sufficient?

@davidxl may remember the details, but iirc fully using minsize/optnone for 
cold funcs might have been too big of a hammer performance-wise.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D149800/new/

https://reviews.llvm.org/D149800

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