vsavchenko added a comment. Here is a proof in Z3: https://gist.github.com/SavchenkoValeriy/559ca923b050f2c01e340c1be543b7e0 Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D80117/new/ https://reviews.llvm.org/D80117