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Author SHA1 Message Date
Ulrich Weigand 0f1de04979 [SystemZ] Custom-expand ATOMIC_CMP_AND_SWAP_WITH_SUCCESS 
The SystemZ compare-and-swap instructions already provide the "success"
indication via a condition-code value, so the default expansion of those
operations generates an unnecessary extra comparsion.

llvm-svn: 314428
 2017-09-28 16:22:54 +00:00
Ulrich Weigand a11f63a952 [SystemZ] Add support for 128-bit atomic load/store/cmpxchg 
This adds support for the main 128-bit atomic operations,
using the SystemZ instructions LPQ, STPQ, and CDSG.

Generating these instructions is a bit more complex than usual
since the i128 type is not legal for the back-end.  Therefore,
we have to hook the LowerOperationWrapper and ReplaceNodeResults
TargetLowering callbacks.

llvm-svn: 310094
 2017-08-04 18:57:58 +00:00