[all-commits] [llvm/llvm-project] 0f1494: AArch64: avoid UB shift of negative value

[Tim Northover via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 0f1494be43f0916516533fea9d99e9211bb4c581
      https://github.com/llvm/llvm-project/commit/0f1494be43f0916516533fea9d99e9211bb4c581
  Author: Tim Northover <t.p.northover at gmail.com>
  Date:   2020-07-27 (Mon, 27 Jul 2020)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64InstrInfo.cpp

  Log Message:
  -----------
  AArch64: avoid UB shift of negative value

Left shifting a negative value is undefined behaviour, so this just moves the
negation afterwards to avoid it.