diff options
Diffstat (limited to 'sysdeps/x86_64/fpu/feholdexcpt.c')
-rw-r--r-- | sysdeps/x86_64/fpu/feholdexcpt.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/sysdeps/x86_64/fpu/feholdexcpt.c b/sysdeps/x86_64/fpu/feholdexcpt.c new file mode 100644 index 0000000..db53d0f --- /dev/null +++ b/sysdeps/x86_64/fpu/feholdexcpt.c @@ -0,0 +1,41 @@ +/* Store current floating-point environment and clear exceptions. + 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 +feholdexcept (fenv_t *envp) +{ + unsigned short int work; + unsigned int mxcsr; + + /* Store the environment. */ + __asm__ ("fnstenv %0\n" + "stmxcsr %1" : "=m" (*envp), "=m" (envp->__mxcsr)); + + /* Now set all exceptions to non-stop, first the x87 FPU. */ + work = envp->__control_word | 0x3f; + __asm__ ("fldcw %0" : : "m" (*&work)); + + /* Set the SSE MXCSR register. */ + mxcsr = envp->__mxcsr | 0x1f80; + __asm__ ("ldmxcsr %0" : : "m" (*&mxcsr)); + + return 0; +} |