[all-commits] [llvm/llvm-project] 865fe1: [RISCV] Fix a mistake in PostprocessISelDAG

[Haocong Lu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 865fe131f87c68e27f64a1fe6f6351b6a6952cca
      https://github.com/llvm/llvm-project/commit/865fe131f87c68e27f64a1fe6f6351b6a6952cca
  Author: Haocong.Lu <Haocong.Lu at streamcomputing.com>
  Date:   2022-02-25 (Fri, 25 Feb 2022)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
    M llvm/test/CodeGen/RISCV/fold-addi-loadstore.ll

  Log Message:
  -----------
  [RISCV] Fix a mistake in PostprocessISelDAG

With the condition N->use_empty(), the root node of DAG always
misses peephole optimization. So a dummy node is needed.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D119934