[PATCH] D39768: [coroutines] Promote cleanup.dest.slot allocas to registers to avoid storing it in the coroutine frame

[Gor Nishanov via Phabricator via cfe-commits]

GorNishanov created this revision.
Herald added a subscriber: EricWF.

We don't want to store cleanup dest slot saved into the coroutine frame (as some of the cleanup code may
access them after coroutine frame destroyed).

This is an alternative to https://reviews.llvm.org/D37093

It is possible to do this for all functions, but, cursory check showed that in -O0, we get slightly longer function (by 1-3 instructions), thus, we are only limiting cleanup.dest.slot elimination to coroutines.


https://reviews.llvm.org/D39768

Files:
  lib/CodeGen/CodeGenFunction.cpp
  lib/CodeGen/CodeGenFunction.h
  test/CodeGenCoroutines/coro-dest-slot.cpp

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