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John Brawn 2e907d9b53 [RegAllocGreedy] IMPLICIT_DEF values shouldn't prefer registers
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
2018-12-14 14:07:57 +00:00
..
2018-11-27 18:57:43 +00:00