[PATCH] D92637: [DAGCombine][PowerPC] Simplify nabs by using legal `smin` operation

[Kai Luo via Phabricator via llvm-commits]

lkail created this revision.
lkail added reviewers: RKSimon, spatel, steven.zhang, PowerPC.
Herald added subscribers: shchenz, hiraditya, nemanjai.
lkail requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

Convert `0 - abs(x)` to `smin (x, -x)` if `smin` is a legal operation.

Verification: https://alive2.llvm.org/ce/z/vpquFR


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D92637

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/PowerPC/neg-abs.ll

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