[PATCH] D49303: [CodeGen][ObjC] Treat non-escaping blocks as global blocks to make copy/dispose a no-op

[John McCall via Phabricator via cfe-commits]

rjmccall added a comment.

Blocks that don't capture anything have always been allocated globally.  This optimization is using the global ISA for blocks that do capture locals but which are known statically (on penalty of UB) to not escape the original scope of the block literal.  Using the global ISA causes attempts to copy these blocks to have no effect, in case the program attempts to do unnecessary copies despite the block being declared non-escaping.


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D49303/new/

https://reviews.llvm.org/D49303