| /* Raise given exceptions. |
| Copyright (C) 1997, 1998, 2000, 2001, 2002, 2007 |
| Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Jes Sorensen <Jes.Sorensen@cern.ch>, 2000. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <fenv.h> |
| #include <float.h> |
| #include <math.h> |
| #include <signal.h> |
| #include <unistd.h> |
| |
| int |
| feraiseexcept (int excepts) |
| { |
| double tmp; |
| double dummy; |
| |
| /* Raise exceptions represented by EXPECTS. But we must raise only |
| one signal at a time. It is important the if the overflow/underflow |
| exception and the inexact exception are given at the same time, |
| the overflow/underflow exception precedes the inexact exception. */ |
| |
| /* We do these bits in assembly to be certain GCC doesn't optimize |
| away something important. */ |
| |
| /* First: invalid exception. */ |
| if (FE_INVALID & excepts) |
| { |
| /* One example of a invalid operation is 0 * Infinity. */ |
| tmp = 0; |
| __asm__ __volatile__ ("frcpa.s0 %0,p1=f0,f0" : "=f" (tmp) : : "p1" ); |
| } |
| |
| /* Next: division by zero. */ |
| if (FE_DIVBYZERO & excepts) |
| __asm__ __volatile__ ("frcpa.s0 %0,p1=f1,f0" : "=f" (tmp) : : "p1" ); |
| |
| /* Next: overflow. */ |
| if (FE_OVERFLOW & excepts) |
| { |
| dummy = DBL_MAX; |
| |
| __asm__ __volatile__ ("fadd.d.s0 %0=%1,%1" : "=f" (dummy) : "0" (dummy)); |
| } |
| |
| /* Next: underflow. */ |
| if (FE_UNDERFLOW & excepts) |
| { |
| dummy = DBL_MIN; |
| |
| __asm__ __volatile__ ("fnma.d.s0 %0=%1,%1,f0" : "=f" (tmp) : "f" (dummy)); |
| } |
| |
| /* Last: inexact. */ |
| if (FE_INEXACT & excepts) |
| { |
| dummy = DBL_MAX; |
| __asm__ __volatile__ ("fsub.d.s0 %0=%1,f1" : "=f" (dummy) : "0" (dummy)); |
| } |
| |
| /* Success. */ |
| return 0; |
| } |
| libm_hidden_def (feraiseexcept) |
