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66531c998a
We'e specialized `std::signbit` for signed and unsigned integral types seperately, even though the optimizer can trivially figure out that `unsigned_value < 0` always false is. This patch removes the specialization, since there is really not much of a benefit to it.
97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// bool signbit(floating-point-type x); // constexpr since C++23
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// We don't control the implementation on windows
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// UNSUPPORTED: windows
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// These compilers don't support constexpr `__builtin_signbit` yet.
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// UNSUPPORTED: clang-18, clang-19, apple-clang-15, apple-clang-16, apple-clang-17
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// GCC warns about signbit comparing `bool_v < 0`, which we're testing
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// ADDITIONAL_COMPILE_FLAGS(gcc): -Wno-bool-compare
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// XFAIL: FROZEN-CXX03-HEADERS-FIXME
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#include <cassert>
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#include <cmath>
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#include <limits>
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#include "test_macros.h"
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#include "type_algorithms.h"
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struct TestFloat {
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template <class T>
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static TEST_CONSTEXPR_CXX23 bool test() {
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assert(!std::signbit(T(0)));
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assert(!std::signbit(std::numeric_limits<T>::min()));
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assert(!std::signbit(std::numeric_limits<T>::denorm_min()));
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assert(!std::signbit(std::numeric_limits<T>::max()));
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assert(!std::signbit(std::numeric_limits<T>::infinity()));
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assert(!std::signbit(std::numeric_limits<T>::quiet_NaN()));
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assert(!std::signbit(std::numeric_limits<T>::signaling_NaN()));
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assert(std::signbit(-T(0)));
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assert(std::signbit(-std::numeric_limits<T>::infinity()));
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assert(std::signbit(std::numeric_limits<T>::lowest()));
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return true;
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}
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template <class T>
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TEST_CONSTEXPR_CXX23 void operator()() {
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test<T>();
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#if TEST_STD_VER >= 23
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static_assert(test<T>());
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#endif
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}
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};
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struct TestInt {
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template <class T>
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static TEST_CONSTEXPR_CXX23 bool test() {
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assert(!std::signbit(std::numeric_limits<T>::max()));
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assert(!std::signbit(T(0)));
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if (std::is_unsigned<T>::value) {
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assert(!std::signbit(std::numeric_limits<T>::lowest()));
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} else {
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assert(std::signbit(std::numeric_limits<T>::lowest()));
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}
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return true;
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}
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template <class T>
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TEST_CONSTEXPR_CXX23 void operator()() {
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test<T>();
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#if TEST_STD_VER >= 23
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static_assert(test<T>());
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#endif
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}
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};
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template <typename T>
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struct ConvertibleTo {
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operator T() const { return T(); }
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};
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int main(int, char**) {
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types::for_each(types::floating_point_types(), TestFloat());
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types::for_each(types::integral_types(), TestInt());
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// Make sure we can call `std::signbit` with convertible types. This checks
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// whether overloads for all cv-unqualified floating-point types are working
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// as expected.
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{
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assert(!std::signbit(ConvertibleTo<float>()));
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assert(!std::signbit(ConvertibleTo<double>()));
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assert(!std::signbit(ConvertibleTo<long double>()));
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}
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return 0;
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}
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