tree 5cf2009822846ed7444f253a4013b43a580015af
parent 533714cdc2bb729d96c4fc7c577b7842480149c8
author Matt Arsenault <Matthew.Arsenault@amd.com> 1546989738 +0000
committer Matt Arsenault <Matthew.Arsenault@amd.com> 1546989738 +0000

RegisterCoalescer: Assume CR_Replace for SubRangeJoin

Currently it's possible for following
check on V.WriteLanes (which is not really meaningful
during SubRangeJoin) to pass for one half of the pair,
and then fall through to to one of the impossible
or unresolved states. This then fails as inconsistent
on the other half.

During the main range join, the check between V.WriteLanes
and OtherV.ValidLanes must have passed, meaning this
should be a CR_Replace.

Fixes most of the testcases in bugs 39542 and 39602

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350678 91177308-0d34-0410-b5e6-96231b3b80d8