[all-commits] [llvm/llvm-project] 67ef63: [SDAG] enable binop identity constant folds for sub

[Luo, Yuanke via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 67ef63138b28369c2fcc3b15c1a4e27c55817143
      https://github.com/llvm/llvm-project/commit/67ef63138b28369c2fcc3b15c1a4e27c55817143
  Author: Luo, Yuanke <yuanke.luo at intel.com>
  Date:   2022-02-21 (Mon, 21 Feb 2022)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/X86/vector-bo-select.ll

  Log Message:
  -----------
  [SDAG] enable binop identity constant folds for sub

This patch extract the sub folding from D119654 and leave only add
folding in that patch.

Differential Revision: https://reviews.llvm.org/D120116