projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d5efd131 | 1 | /* Raise given exceptions. |
| f7a9f785 | 2 | Copyright (C) 1997-2016 Free Software Foundation, Inc. |
| d5efd131 MF |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Jes Sorensen <Jes.Sorensen@cern.ch>, 2000. | |
| 5 | ||
| 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. | |
| 10 | ||
| 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. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Lesser General Public | |
| 75efb018 MF |
17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ | |
| d5efd131 MF |
19 | |
| 20 | #include <fenv.h> | |
| 21 | #include <float.h> | |
| 22 | #include <math.h> | |
| 23 | #include <signal.h> | |
| 24 | #include <unistd.h> | |
| 25 | ||
| 26 | int | |
| 0747f818 | 27 | __feraiseexcept (int excepts) |
| d5efd131 MF |
28 | { |
| 29 | double tmp; | |
| 30 | double dummy; | |
| 31 | ||
| 32 | /* Raise exceptions represented by EXPECTS. But we must raise only | |
| 33 | one signal at a time. It is important the if the overflow/underflow | |
| 34 | exception and the inexact exception are given at the same time, | |
| 35 | the overflow/underflow exception precedes the inexact exception. */ | |
| 36 | ||
| 37 | /* We do these bits in assembly to be certain GCC doesn't optimize | |
| 38 | away something important. */ | |
| 39 | ||
| 40 | /* First: invalid exception. */ | |
| 41 | if (FE_INVALID & excepts) | |
| 42 | { | |
| c0c3f78a | 43 | /* One example of an invalid operation is 0 * Infinity. */ |
| d5efd131 MF |
44 | tmp = 0; |
| 45 | __asm__ __volatile__ ("frcpa.s0 %0,p1=f0,f0" : "=f" (tmp) : : "p1" ); | |
| 46 | } | |
| 47 | ||
| 48 | /* Next: division by zero. */ | |
| 49 | if (FE_DIVBYZERO & excepts) | |
| 50 | __asm__ __volatile__ ("frcpa.s0 %0,p1=f1,f0" : "=f" (tmp) : : "p1" ); | |
| 51 | ||
| 52 | /* Next: overflow. */ | |
| 53 | if (FE_OVERFLOW & excepts) | |
| 54 | { | |
| 55 | dummy = DBL_MAX; | |
| 56 | ||
| 57 | __asm__ __volatile__ ("fadd.d.s0 %0=%1,%1" : "=f" (dummy) : "0" (dummy)); | |
| 58 | } | |
| 59 | ||
| 60 | /* Next: underflow. */ | |
| 61 | if (FE_UNDERFLOW & excepts) | |
| 62 | { | |
| 63 | dummy = DBL_MIN; | |
| 64 | ||
| 65 | __asm__ __volatile__ ("fnma.d.s0 %0=%1,%1,f0" : "=f" (tmp) : "f" (dummy)); | |
| 66 | } | |
| 67 | ||
| 68 | /* Last: inexact. */ | |
| 69 | if (FE_INEXACT & excepts) | |
| 70 | { | |
| 71 | dummy = DBL_MAX; | |
| 72 | __asm__ __volatile__ ("fsub.d.s0 %0=%1,f1" : "=f" (dummy) : "0" (dummy)); | |
| 73 | } | |
| 74 | ||
| 75 | /* Success. */ | |
| 76 | return 0; | |
| 77 | } | |
| 0747f818 JM |
78 | libm_hidden_def (__feraiseexcept) |
| 79 | weak_alias (__feraiseexcept, feraiseexcept) | |
| 80 | libm_hidden_weak (feraiseexcept) |