[PATCH] D28043: AMDGPU: Undo sub x, c -> add x, -c canonicalization

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
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Herald added a reviewer: tstellarAMD.
Herald added subscribers: tony-tye, yaxunl, nhaehnle, wdng, kzhuravl.

This is worse if the original constant is an inline immediate.

      

This should also be done for 64-bit adds, but requires fixing
operand folding bugs first.


https://reviews.llvm.org/D28043

Files:
  lib/Target/AMDGPU/SIInstrInfo.td
  lib/Target/AMDGPU/SIInstructions.td
  lib/Target/AMDGPU/VOP2Instructions.td
  test/CodeGen/AMDGPU/s_addk_i32.ll
  test/CodeGen/AMDGPU/shrink-add-sub-constant.ll

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