1 /* Raise given exceptions.
2 Copyright (C) 1997, 1998, 2000, 2001, 2002 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Jes Sorensen <Jes.Sorensen@cern.ch>, 2000.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
28 feraiseexcept (int excepts)
33 /* Raise exceptions represented by EXPECTS. But we must raise only
34 one signal at a time. It is important the if the overflow/underflow
35 exception and the inexact exception are given at the same time,
36 the overflow/underflow exception precedes the inexact exception. */
38 /* We do these bits in assembly to be certain GCC doesn't optimize
39 away something important. */
41 /* First: invalid exception. */
42 if (FE_INVALID & excepts)
44 /* One example of a invalid operation is 0 * Infinity. */
46 __asm__ __volatile__ ("frcpa.s0 %0,p1=f0,f0" : "=f" (tmp) : : "p1" );
49 /* Next: division by zero. */
50 if (FE_DIVBYZERO & excepts)
51 __asm__ __volatile__ ("frcpa.s0 %0,p1=f1,f0" : "=f" (tmp) : : "p1" );
54 if (FE_OVERFLOW & excepts)
58 __asm__ __volatile__ ("fadd.d.s0 %0=%1,%1" : "=f" (dummy) : "0" (dummy));
61 /* Next: underflow. */
62 if (FE_UNDERFLOW & excepts)
66 __asm__ __volatile__ ("fnma.d.s0 %0=%1,%1,f0" : "=f" (tmp) : "f" (dummy));
70 if (FE_INEXACT & excepts)
73 __asm__ __volatile__ ("fadd.d.s0 %0=%1,f1" : "=f" (dummy) : "0" (dummy));
79 libm_hidden_def (feraiseexcept)