================ @@ -0,0 +1,130 @@ +//===----------------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23 + +// <numeric> + +// template<class T> +// constexpr T div_sat(T x, T y) noexcept; // freestanding + +#include <cassert> +#include <concepts> +#include <limits> +#include <numeric> + +#include "check_constexpr.h" + +template <typename IntegerT> +constexpr bool test_signed() { + constexpr auto minVal = std::numeric_limits<IntegerT>::min(); + constexpr auto maxVal = std::numeric_limits<IntegerT>::max(); + + static_assert(noexcept(std::div_sat(minVal, maxVal))); + + // No saturation + { + std::same_as<IntegerT> decltype(auto) quot = std::div_sat(IntegerT{3}, IntegerT{4}); + assert(quot == IntegerT{0}); + } + + { + std::same_as<IntegerT> decltype(auto) quot = std::div_sat(maxVal, minVal); + assert(quot == (maxVal / minVal)); + } + + { + std::same_as<IntegerT> decltype(auto) quot = std::div_sat(minVal, maxVal); + assert(quot == (minVal / maxVal)); + } + + // Saturation - max only + { + std::same_as<IntegerT> decltype(auto) quot = std::div_sat(minVal, IntegerT{-1}); + assert(quot == maxVal); + } + + return true; +} + +template <typename IntegerT> +constexpr bool test_unsigned() { + constexpr auto minVal = std::numeric_limits<IntegerT>::min(); + constexpr auto maxVal = std::numeric_limits<IntegerT>::max(); + + static_assert(noexcept(std::div_sat(minVal, maxVal))); + + // No saturation + { + std::same_as<IntegerT> decltype(auto) quot = std::div_sat(IntegerT{3}, IntegerT{4}); + assert(quot == IntegerT{0}); + } + + { + std::same_as<IntegerT> decltype(auto) quot = std::div_sat(minVal, maxVal); + assert(quot == (minVal / maxVal)); + } + + // Unsigned integer devision never overflow + + return true; +} + +template <typename IntegerT> +void test_constexpr() { + TEST_EXPRESSION_CONSTEXPR(std::div_sat(IntegerT{90}, IntegerT{84})); + TEST_EXPRESSION_NOT_CONSTEXPR(std::div_sat(IntegerT{90}, IntegerT{0})); ---------------- philnik777 wrote:
We don't want to test the compiler in our tests. There is no need to check that division by zero results in an expression that's not constant AFAICT. The check for the `constexpr` expression can simply be tested by putting it into a scope that is forced to be constant evaluated. https://github.com/llvm/llvm-project/pull/77967 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
