[PATCH] D14385: Correct atomic libcall support for __atomic_*_fetch builtins.

[James Y Knight via cfe-commits]

jyknight created this revision.
jyknight added a reviewer: rsmith.
jyknight added subscribers: majnemer, compnerd, cfe-commits, tstellarAMD.

In r244063, I had caused these builtins to call the same-named library
functions, __atomic_*_fetch_SIZE. However, this was incorrect: while
those functions are in fact supported by GCC's libatomic, they're not
documented by the spec (and gcc doesn't ever call them).

Instead, you're /supposed/ to call the __atomic_fetch_* builtins and
then redo the operation inline to return the final value.

http://reviews.llvm.org/D14385

Files:
  lib/CodeGen/CGAtomic.cpp
  test/CodeGen/atomic-ops-libcall.c

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