diff options
Diffstat (limited to 'sysdeps/x86_64/fpu/fclrexcpt.c')
-rw-r--r-- | sysdeps/x86_64/fpu/fclrexcpt.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/sysdeps/x86_64/fpu/fclrexcpt.c b/sysdeps/x86_64/fpu/fclrexcpt.c new file mode 100644 index 0000000000..4fc3bfbdc7 --- /dev/null +++ b/sysdeps/x86_64/fpu/fclrexcpt.c @@ -0,0 +1,52 @@ +/* Clear given exceptions in current floating-point environment. + Copyright (C) 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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 +feclearexcept (int excepts) +{ + fenv_t temp; + unsigned int mxcsr; + + /* Mask out unsupported bits/exceptions. */ + excepts &= FE_ALL_EXCEPT; + + /* Bah, we have to clear selected exceptions. Since there is no + `fldsw' instruction we have to do it the hard way. */ + __asm__ ("fnstenv %0" : "=m" (*&temp)); + + /* Clear the relevant bits. */ + temp.__status_word &= excepts ^ FE_ALL_EXCEPT; + + /* Put the new data in effect. */ + __asm__ ("fldenv %0" : : "m" (*&temp)); + + /* And the same procedure for SSE. */ + __asm__ ("stmxcsr %0" : "=m" (*&mxcsr)); + + /* Clear the relevant bits. */ + mxcsr &= ~excepts; + + /* And put them into effect. */ + __asm__ ("ldmxcsr %0" : : "m" (*&mxcsr)); + + /* Success. */ + return 0; +} |