Do not actually allocate a register for an undef use. Previously we we
would create unnecessary reload instruction for undef uses where the
register wasn't live.
This is part of my regallocfast rewrite series (see also D52010)
Differential D54364
RegAllocFast: Do not allocate registers for undef uses ClosedPublic Authored by arsenm on Nov 9 2018, 4:27 PM.
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Event TimelineThis revision is now accepted and ready to land.Nov 14 2018, 11:52 AM This revision now requires review to proceed.Mar 19 2019, 12:03 PM This revision is now accepted and ready to land.Mar 19 2019, 12:14 PM
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Diff 173469 lib/CodeGen/RegAllocFast.cpp
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