/*- * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG> * 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 AUTHOR 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 AUTHOR 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. * * $FreeBSD: src/lib/msun/amd64/fenv.c,v 1.2 2004/06/11 02:35:19 das Exp $ */ #include <fenv.h> intfesetexceptflag(const fexcept_t *flagp, int excepts){	unsigned __mxcsr; 	__stmxcsr(&__mxcsr);	__mxcsr &= ~excepts;	__mxcsr |= *flagp & excepts;	__ldmxcsr(__mxcsr); 	return (0);} intferaiseexcept(int excepts){	fexcept_t ex = excepts; 	fesetexceptflag(&ex, excepts); 	// The DIVSS instruction can generate all SSE2 exceptions,	// which hopefully means it will check all exception flags.	// asm volatile("divss %0,%0" : : "x" (1.0)); 	return (0);} intfeholdexcept(fenv_t *envp){	int mxcsr; 	__stmxcsr(&mxcsr);	*envp = mxcsr;	mxcsr &= ~FE_ALL_EXCEPT;	mxcsr |= FE_ALL_EXCEPT << 7;	__ldmxcsr(mxcsr);	return (0);} intfeupdateenv(const fenv_t *envp){	int mxcsr; 	__stmxcsr(&mxcsr);	fesetenv(envp);	feraiseexcept(mxcsr & FE_ALL_EXCEPT);	return (0);}