[PATCH] Atomics: emit cmpxchg instructions with weaker failure-order

[Tim Northover]

Hi all,

Now that the LLVM IR supports specifying a failure memory ordering on cmpxchg, Clang should start emitting them. With this patch I decided to go straight for the "N x M" possible outputs because __c11_atomic_compare_exchange is used by libc++, so just handling the constant case would exclude a lot of users from the potential benefits.

Does it look OK?

Cheers.

Tim.

http://llvm-reviews.chandlerc.com/D3053

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