[PATCH] D63774: android: enable double-word CAS on x86_64

[Saleem Abdulrasool via Phabricator via cfe-commits]

compnerd added a comment.

@craig.topper, hmm, what happens in terms of CG when LAHF/SAHF are not available?  I assume its just worse CG as you could spill AH onto the stack and do a load/store.  This actually results in library calls which may not be possible to fulfill.


Repository:
  rC Clang

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  https://reviews.llvm.org/D63774/new/

https://reviews.llvm.org/D63774