[PATCH] D62257: [DAGCombiner][X86][AArch64] (x - C) + y -> (x + y) - C fold

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri created this revision.
lebedev.ri added reviewers: RKSimon, craig.topper, spatel.
lebedev.ri added a project: LLVM.
Herald added subscribers: kristof.beyls, javed.absar.
lebedev.ri added a parent revision: D62252: [DAGCombiner][X86][AArch64][SPARC][SystemZ] y - (x + C)  ->  (y - x) - C  fold.

Only vector tests are being affected here,
since subtraction by scalar constant is rewritten
as addition by negated constant.

No surprising test changes.

https://rise4fun.com/Alive/pbT


Repository:
  rL LLVM

https://reviews.llvm.org/D62257

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AArch64/sink-addsub-of-const.ll
  test/CodeGen/X86/sink-addsub-of-const.ll
  test/CodeGen/X86/vector-idiv-sdiv-128.ll
  test/CodeGen/X86/vector-idiv-sdiv-256.ll
  test/CodeGen/X86/vector-idiv-sdiv-512.ll

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