Craig Topper 50b1d4303d [DAGCombiner] Teach DAG combiner that A-(B-C) can be folded to A+(C-B) ...

This can be useful since addition is commutable, and subtraction is not.

This matches a transform that is also done by InstCombine.

llvm-svn: 338181

2018-07-28 00:27:25 +00:00

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