[llvm-bugs] [Bug 52345] New: sporadic crashes while compiling min/max implementations

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=52345

            Bug ID: 52345
           Summary: sporadic crashes while compiling min/max
                    implementations
           Product: clang
           Version: 12.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: janezz55 at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Interestingly, clang++ won't crash every time, but only now and then:

clang++ -std=c++20 dpp.cpp -o dpp

code is here:
https://github.com/user1095108/dpp

the code that appears to cause the crash:
template <typename U>
constexpr static auto bit_size_v(CHAR_BIT * sizeof(U));

template <typename U>
constexpr static auto is_integral_v(
  std::is_integral_v<U> || std::is_same_v<U, DPP_INT128T>
);

template <typename U>
constexpr static auto is_signed_v(
  std::is_signed_v<U> || std::is_same_v<U, DPP_INT128T>
);

template <typename U>
consteval auto min() noexcept
{
  if constexpr(detail::is_signed_v<U>)
  {
    return U(U(1) << (detail::bit_size_v<U> - 1));
  }
  else
  {
    return U{};
  }
}

template <typename U>
consteval auto max() noexcept
{
  if constexpr(detail::is_signed_v<U>)
  {
    return -U(min<U>() + U(1));
  }
  else
  {
    return ~U();
  }
}

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