Reapply r216805 "[MachineCombiner][AArch64] Use the correct register class for MADD, SUB, and OR.""
This reapplies r216805 with a fix to a copy-past error, which resulted in an
incorrect register class.
Original commit message:
Select the correct register class for the various instructions that are
generated when combining instructions and constrain the registers to the
appropriate register class.
This fixes rdar://problem/
18183707.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217019
91177308-0d34-0410-b5e6-
96231b3b80d8
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