| /* Enable floating-point exceptions. |
| Copyright (C) 2001, 2007 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Andreas Jaeger <aj@suse.de>, 2001. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <fenv.h> |
| |
| int |
| feenableexcept (int excepts) |
| { |
| unsigned short int new_exc, old_exc; |
| unsigned int new; |
| |
| excepts &= FE_ALL_EXCEPT; |
| |
| /* Get the current control word of the x87 FPU. */ |
| __asm__ ("fstcw %0" : "=m" (*&new_exc)); |
| |
| old_exc = (~new_exc) & FE_ALL_EXCEPT; |
| |
| new_exc &= ~excepts; |
| __asm__ ("fldcw %0" : : "m" (*&new_exc)); |
| |
| /* And now the same for the SSE MXCSR register. */ |
| __asm__ ("stmxcsr %0" : "=m" (*&new)); |
| |
| /* The SSE exception masks are shifted by 7 bits. */ |
| new &= ~(excepts << 7); |
| __asm__ ("ldmxcsr %0" : : "m" (*&new)); |
| |
| return old_exc; |
| } |
