lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Install given floating-point environment and raise exceptions. |
| 2 | Copyright (C) 1997,99,2000,01,07 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
| 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 |
| 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 |
| 19 | 02111-1307 USA. */ |
| 20 | |
| 21 | #include <fenv.h> |
| 22 | #include <unistd.h> |
| 23 | |
| 24 | libm_hidden_proto(fesetenv) |
| 25 | libm_hidden_proto(feraiseexcept) |
| 26 | |
| 27 | int |
| 28 | feupdateenv (const fenv_t *envp) |
| 29 | { |
| 30 | fexcept_t temp; |
| 31 | /* unsigned int xtemp = 0; */ |
| 32 | |
| 33 | /* Save current exceptions. */ |
| 34 | __asm__ ("fnstsw %0" : "=m" (*&temp)); |
| 35 | |
| 36 | #if 0 |
| 37 | /* If the CPU supports SSE we test the MXCSR as well. */ |
| 38 | if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0) |
| 39 | __asm__ ("stmxcsr %0" : "=m" (*&xtemp)); |
| 40 | |
| 41 | temp = (temp | xtemp) & FE_ALL_EXCEPT; |
| 42 | #else |
| 43 | temp &= FE_ALL_EXCEPT; |
| 44 | #endif |
| 45 | |
| 46 | /* Install new environment. */ |
| 47 | fesetenv (envp); |
| 48 | |
| 49 | /* Raise the saved exception. Incidently for us the implementation |
| 50 | defined format of the values in objects of type fexcept_t is the |
| 51 | same as the ones specified using the FE_* constants. */ |
| 52 | feraiseexcept ((int) temp); |
| 53 | |
| 54 | /* Success. */ |
| 55 | return 0; |
| 56 | } |