//===- llvm/Support/FEnv.h - Host floating-point exceptions ------*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file provides an operating system independent interface to // floating-point exception interfaces. // //===----------------------------------------------------------------------===// #ifndef LLVM_SYSTEM_FENV_H #define LLVM_SYSTEM_FENV_H #include "llvm/Config/config.h" #include <cerrno> #ifdef HAVE_FENV_H #include <fenv.h> #endif // FIXME: Clang's #include handling apparently doesn't work for libstdc++'s // fenv.h; see PR6907 for details. #if defined(__clang__) && defined(_GLIBCXX_FENV_H) #undef HAVE_FENV_H #endif namespace llvm { namespace sys { /// llvm_fenv_clearexcept - Clear the floating-point exception state. static inline void llvm_fenv_clearexcept() { #ifdef HAVE_FENV_H feclearexcept(FE_ALL_EXCEPT); #endif errno = 0; } /// llvm_fenv_testexcept - Test if a floating-point exception was raised. static inline bool llvm_fenv_testexcept() { int errno_val = errno; if (errno_val == ERANGE || errno_val == EDOM) return true; #ifdef HAVE_FENV_H if (fetestexcept(FE_ALL_EXCEPT & ~FE_INEXACT)) return true; #endif return false; } } // End sys namespace } // End llvm namespace #endif