[all-commits] [llvm/llvm-project] 44bd8e: [DAGCombine][PowerPC] Simplify nabs by using legal...

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  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 44bd8ea167f2138de9317196a7b199840e29fb59
      https://github.com/llvm/llvm-project/commit/44bd8ea167f2138de9317196a7b199840e29fb59
  Author: Kai Luo <lkail at cn.ibm.com>
  Date:   2020-12-08 (Tue, 08 Dec 2020)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetLowering.h
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/test/CodeGen/PowerPC/neg-abs.ll

  Log Message:
  -----------
  [DAGCombine][PowerPC] Simplify nabs by using legal `smin` operation

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

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

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D92637