[PATCH] D58967: [DAGCombiner] Add SADDO/SSUBO combine support

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, nikic, deadalnix.
Herald added a project: LLVM.

Basic constant handling folds, for both scalars and vectors


Repository:
  rL LLVM

https://reviews.llvm.org/D58967

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/combine-addo.ll
  test/CodeGen/X86/combine-subo.ll
  test/CodeGen/X86/xaluo.ll

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