1 /* Set floating-point environment exception handling. 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_libc.h> 20 #include <math.h> 21 #include <fpu_control.h> 22 23 int fesetexceptflag(const fexcept_t * flagp,int excepts)24fesetexceptflag (const fexcept_t *flagp, int excepts) 25 { 26 fexcept_t fpc, fpc_new; 27 28 /* Get the current environment. We have to do this since we cannot 29 separately set the status word. */ 30 _FPU_GETCW (fpc); 31 32 /* Clear the current exception bits. */ 33 fpc_new = fpc & ~((excepts & FE_ALL_EXCEPT) << FPC_FLAGS_SHIFT); 34 if ((fpc & FPC_NOT_FPU_EXCEPTION) == 0) 35 /* Bits 6, 7 of dxc-byte are zero, 36 thus bits 0-5 of dxc-byte correspond to the flag-bits. 37 Clear given exceptions in dxc-field. */ 38 fpc_new &= ~((excepts & FE_ALL_EXCEPT) << FPC_DXC_SHIFT); 39 40 /* Set exceptions from flagp in flags-field. */ 41 fpc_new |= (*flagp & excepts & FE_ALL_EXCEPT) << FPC_FLAGS_SHIFT; 42 43 /* Store the new status word (along with the rest of the environment. 44 Possibly new exceptions are set but they won't get executed. */ 45 _FPU_SETCW (fpc_new); 46 47 /* Success. */ 48 return 0; 49 } 50