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fenv.c revision 1.1.2.2 
      1 /*	$NetBSD: fenv.c,v 1.1.2.2 2017/03/20 06:56:59 pgoyette Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004 David Schultz <das (at) FreeBSD.ORG>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  *
     28  * $FreeBSD: releng/10.1/lib/msun/ia64/fenv.c 226415 2011-10-16 05:37:56Z das $
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __RCSID("$NetBSD: fenv.c,v 1.1.2.2 2017/03/20 06:56:59 pgoyette Exp $");
     33 
     34 #define	__fenv_static
     35 #include "fenv.h"
     36 
     37 #if defined(__GNUC_GNU_INLINE__) && !defined(__lint__)
     38 #error "This file must be compiled with C99 'inline' semantics"
     39 #endif
     40 
     41 const fenv_t __fe_dfl_env = 0x0009804c8a70033fULL;
     42 
     43 extern inline int feclearexcept(int __excepts);
     44 extern inline int fegetexceptflag(fexcept_t *__flagp, int __excepts);
     45 extern inline int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
     46 extern inline int feraiseexcept(int __excepts);
     47 extern inline int fetestexcept(int __excepts);
     48 extern inline int fegetround(void);
     49 extern inline int fesetround(int __round);
     50 extern inline int fegetenv(fenv_t *__envp);
     51 extern inline int feholdexcept(fenv_t *__envp);
     52 extern inline int fesetenv(const fenv_t *__envp);
     53 
     54 /*
     55  * It doesn't pay to inline feupdateenv() because it includes one of
     56  * the rare uses of feraiseexcept() where the argument is not a
     57  * constant.  Thus, no dead code elimination can occur, resulting in
     58  * significant bloat.
     59  */
     60 int
     61 feupdateenv(const fenv_t *envp)
     62 {
     63 	fenv_t fpsr;
     64 
     65 	__stfpsr(&fpsr);
     66 	__ldfpsr(*envp);
     67 	feraiseexcept((fpsr >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
     68 	return (0);
     69 }
     70