Tim Northover 9c177223bc CodeGen: make use of weaker failure orders on cmpxchg. ...

This makes Clang take advantage of the recent IR addition of a
"failure" memory ordering requirement. As with the "success" ordering,
we try to emit just a single version if the expression is constant,
but fall back to runtime detection (to allow optimisation across
function-call boundaries).

rdar://problem/15996804

llvm-svn: 203837

2014-03-13 19:25:48 +00:00

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