[all-commits] [llvm/llvm-project] 32088f: [ConstantFolding] Fold freeze if it is never undef...

[Juneyoung Lee via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 32088f4f7fc734474d1249d288a34894a4e901a9
      https://github.com/llvm/llvm-project/commit/32088f4f7fc734474d1249d288a34894a4e901a9
  Author: Juneyoung Lee <aqjune at gmail.com>
  Date:   2020-07-26 (Sun, 26 Jul 2020)

  Changed paths:
    M llvm/lib/Analysis/ConstantFolding.cpp
    M llvm/test/Analysis/ConstantFolding/freeze.ll

  Log Message:
  -----------
  [ConstantFolding] Fold freeze if it is never undef or poison

This is a simple patch that adds constant folding for freeze
instruction.

IIUC, it isn't needed to update ConstantFold.cpp because there is no freeze
constexpr.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D84597