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