[all-commits] [llvm/llvm-project] 784f25: Precommit test files for D105344 (NFC)

[Juneyoung Lee via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 784f258c0970ec978dc761e390b32cc2ef84d29d
      https://github.com/llvm/llvm-project/commit/784f258c0970ec978dc761e390b32cc2ef84d29d
  Author: Juneyoung Lee <aqjune at gmail.com>
  Date:   2021-07-28 (Wed, 28 Jul 2021)

  Changed paths:
    A llvm/test/CodeGen/X86/setcc-freeze.ll

  Log Message:
  -----------
  Precommit test files for D105344 (NFC)


  Commit: 4f71f59bf3d9914188a11d0c41bedbb339d36ff5
      https://github.com/llvm/llvm-project/commit/4f71f59bf3d9914188a11d0c41bedbb339d36ff5
  Author: Juneyoung Lee <aqjune at gmail.com>
  Date:   2021-07-28 (Wed, 28 Jul 2021)

  Changed paths:
    M llvm/include/llvm/CodeGen/SelectionDAGNodes.h
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/X86/setcc-freeze.ll

  Log Message:
  -----------
  [DAGCombiner] Fold SETCC(FREEZE(x),const) to FREEZE(SETCC(x,const)) if SETCC is used by BRCOND

This patch adds a peephole optimization `SETCC(FREEZE(x),const)` => `FREEZE(SETCC(x,const))`
if the SETCC is only used by BRCOND.

Combined with `BRCOND(FREEZE(X)) => BRCOND(X)`, this leads to a nice improvement in the generated assembly when x is a masked loaded value.

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D105344


Compare: https://github.com/llvm/llvm-project/compare/3223d41017f1...4f71f59bf3d9