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2 Commits

Author SHA1 Message Date
Tim Northover
4ef7afc394 X86: remove temporary atomicrmw used during lowering. 
We construct a temporary "atomicrmw xchg" instruction when lowering atomic
stores for widths that aren't supported natively. This isn't on the top-level
worklist though, so it won't be removed automatically and we have to do it
ourselves once that itself has been lowered.

Thanks Saleem for pointing this out!

llvm-svn: 212948
 2014-07-14 15:31:13 +00:00
Tim Northover
60e9ada729 X86: expand atomics in IR instead of as MachineInstrs. 
The logic for expanding atomics that aren't natively supported in
terms of cmpxchg loops is much simpler to express at the IR level. It
also allows the normal optimisations and CodeGen improvements to help
out with atomics, instead of using a limited set of possible
instructions..

rdar://problem/13496295

llvm-svn: 212119
 2014-07-01 18:53:31 +00:00