[PATCH] D142867: [Clang] Add machinery to catch overflow in unary minus outside of a constant expression context

[Evgeny Eltsin via Phabricator via cfe-commits]

eaeltsin added a comment.

The warning now fires even if it is prevent with `if constexpr`:

  if constexpr (width <= 64) {
    if constexpr (width == 64) {
      return 1;
    }
    return -static_cast<int64_t>(uint64_t{1} << (width - 1));
  }

https://godbolt.org/z/M3xdcKd3M


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D142867/new/

https://reviews.llvm.org/D142867