1 /* Install given floating-point environment and raise exceptions. 2 Copyright (C) 2000-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library. If not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #include <fenv.h> 20 #include <string.h> 21 22 int __feupdateenv(const fenv_t * envp)23__feupdateenv (const fenv_t *envp) 24 { 25 union { unsigned long long l; unsigned int sw[2]; } s; 26 fenv_t temp; 27 /* Get the current exception status */ 28 __asm__ ("fstd %%fr0,0(%1) \n\t" 29 "fldd 0(%1),%%fr0 \n\t" 30 : "=m" (s.l) : "r" (&s.l)); 31 32 /* Given environment with exception flags not cleared. */ 33 if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV)) 34 { 35 memcpy(&temp, envp, sizeof (fenv_t)); 36 temp.__status_word |= s.sw[0] & (FE_ALL_EXCEPT << 27); 37 } 38 39 /* Default environment with exception flags not cleared. */ 40 if (envp == FE_DFL_ENV) 41 temp.__status_word = s.sw[0] & (FE_ALL_EXCEPT << 27); 42 43 /* All traps enabled and current exception flags not cleared. */ 44 if (envp == FE_NOMASK_ENV) 45 temp.__status_word = (s.sw[0] & (FE_ALL_EXCEPT << 27)) | FE_ALL_EXCEPT; 46 47 /* Install new environment. */ 48 __fesetenv (&temp); 49 /* Success. */ 50 return 0; 51 } 52 libm_hidden_def (__feupdateenv) 53 weak_alias (__feupdateenv, feupdateenv) 54 libm_hidden_weak (feupdateenv) 55