fenv for amd64; from matthew@

feedback & ok guenther@, matthew@

src/include/fenv.h

@@ -0,0 +1,59 @@
+/*	$OpenBSD: fenv.h,v 1.1 2011/04/21 21:12:56 martynas Exp $	*/
+/*	$NetBSD: fenv.h,v 1.2.4.1 2011/02/08 16:18:55 bouyer Exp $	*/
+
+/*
+ * Copyright (c) 2010 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef	_FENV_H_
+#define	_FENV_H_
+
+#include <sys/cdefs.h>
+#include <machine/fenv.h>
+
+__BEGIN_DECLS
+
+int	feclearexcept(int);
+int	fegetexceptflag(fexcept_t *, int);
+int	feraiseexcept(int);
+int	fesetexceptflag(const fexcept_t *, int);
+int	fetestexcept(int);
+
+int	fegetround(void);
+int	fesetround(int);
+int	fegetenv(fenv_t *);
+int	feholdexcept(fenv_t *);
+int	fesetenv(const fenv_t *);
+int	feupdateenv(const fenv_t *);
+
+#if	__BSD_VISIBLE
+int	feenableexcept(int);
+int	fedisableexcept(int);
+int	fegetexcept(void);
+#endif	/* __BSD_VISIBLE */
+
+__END_DECLS
+
+#endif	/* ! _FENV_H_ */