[PATCH] D29680: [SelectionDAG] Fix bugs in inverted condition splitting code.

[Geoff Berry via Phabricator via llvm-commits]

gberry created this revision.

Fix two bugs in SelectionDAGBuilder::FindMergedConditions reported by
Mikael Holmen.  Handle non-canonicalized xor not operation
correctly (was assuming operand 0 was always the non-constant operand)
and check that the negated condition is also in the same block as the
original and/or instruction (as is done for and/or operands already)
before proceeding with optimization.


https://reviews.llvm.org/D29680

Files:
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  test/CodeGen/AArch64/br-cond-not-merge.ll

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