| //===-- Implementation header for isnan -------------------------*- C++ -*-===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIBC_SRC___SUPPORT_MATH_ISNAN_H |
| #define LLVM_LIBC_SRC___SUPPORT_MATH_ISNAN_H |
| |
| #include "src/__support/FPUtil/FPBits.h" |
| #include "src/__support/macros/config.h" |
| |
| namespace LIBC_NAMESPACE_DECL { |
| namespace math { |
| |
| #undef isnan |
| LIBC_INLINE LIBC_CONSTEXPR int isnan(double x) { |
| #if defined(__LIBC_USE_BUILTIN_ISNAN) && !defined(LIBC_USE_CONSTEXPR) |
| return __builtin_isnan(x); |
| #else |
| return fputil::FPBits<double>(x).is_nan(); |
| #endif |
| } |
| |
| } // namespace math |
| } // namespace LIBC_NAMESPACE_DECL |
| |
| #endif // LLVM_LIBC_SRC___SUPPORT_MATH_ISNAN_H |
