1 //===- llvm/Support/FEnv.h - Host floating-point exceptions ------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file provides an operating system independent interface to 11 // floating-point exception interfaces. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_SYSTEM_FENV_H 16 #define LLVM_SYSTEM_FENV_H 17 18 #include "llvm/Config/config.h" 19 #include <cerrno> 20 #ifdef HAVE_FENV_H 21 #include <fenv.h> 22 #endif 23 24 // FIXME: Clang's #include handling apparently doesn't work for libstdc++'s 25 // fenv.h; see PR6907 for details. 26 #if defined(__clang__) && defined(_GLIBCXX_FENV_H) 27 #undef HAVE_FENV_H 28 #endif 29 30 namespace llvm { 31 namespace sys { 32 33 /// llvm_fenv_clearexcept - Clear the floating-point exception state. 34 static inline void llvm_fenv_clearexcept() { 35 #ifdef HAVE_FENV_H 36 feclearexcept(FE_ALL_EXCEPT); 37 #endif 38 errno = 0; 39 } 40 41 /// llvm_fenv_testexcept - Test if a floating-point exception was raised. 42 static inline bool llvm_fenv_testexcept() { 43 int errno_val = errno; 44 if (errno_val == ERANGE || errno_val == EDOM) 45 return true; 46 #ifdef HAVE_FENV_H 47 if (fetestexcept(FE_ALL_EXCEPT & ~FE_INEXACT)) 48 return true; 49 #endif 50 return false; 51 } 52 53 } // End sys namespace 54 } // End llvm namespace 55 56 #endif 57
