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* [RegAllocGreedy] IMPLICIT_DEF values shouldn't prefer registersJohn Brawn2018-12-141-0/+99
It costs nothing to spill an IMPLICIT_DEF value (the only spill code that's generated is a KILL of the value), so when creating split constraints if the live-out value is IMPLICIT_DEF the exit constraint should be DontCare instead of PrefReg. Differential Revision: https://reviews.llvm.org/D55652 llvm-svn: 349151
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