David Majnemer 641bea117d CodeGen: Emit a libcall if the target doesn't support 16-byte wide atomics
There are targets that support i128 sized scalars but cannot emit
instructions that modify them directly.  The proper thing to do is to
emit a libcall.

This fixes PR17481.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192957 91177308-0d34-0410-b5e6-96231b3b80d8
2013-10-18 08:03:43 +00:00
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