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//===- 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
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