diff options
Diffstat (limited to 'REORG.TODO/sysdeps/i386/fpu/fsetexcptflg.c')
-rw-r--r-- | REORG.TODO/sysdeps/i386/fpu/fsetexcptflg.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/fpu/fsetexcptflg.c b/REORG.TODO/sysdeps/i386/fpu/fsetexcptflg.c new file mode 100644 index 0000000000..efa64aaefd --- /dev/null +++ b/REORG.TODO/sysdeps/i386/fpu/fsetexcptflg.c @@ -0,0 +1,69 @@ +/* Set floating-point environment exception handling. + Copyright (C) 1997-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + 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, see + <http://www.gnu.org/licenses/>. */ + +#include <fenv.h> +#include <math.h> +#include <unistd.h> +#include <ldsodefs.h> +#include <dl-procinfo.h> + +int +__fesetexceptflag (const fexcept_t *flagp, int excepts) +{ + fenv_t temp; + + /* Get the current environment. We have to do this since we cannot + separately set the status word. */ + __asm__ ("fnstenv %0" : "=m" (*&temp)); + + temp.__status_word &= ~(excepts & FE_ALL_EXCEPT); + temp.__status_word |= *flagp & excepts & FE_ALL_EXCEPT; + + /* Store the new status word (along with the rest of the environment. + Possibly new exceptions are set but they won't get executed unless + the next floating-point instruction. */ + __asm__ ("fldenv %0" : : "m" (*&temp)); + + /* If the CPU supports SSE, we set the MXCSR as well. */ + if (HAS_CPU_FEATURE (SSE)) + { + unsigned int xnew_exc; + + /* Get the current MXCSR. */ + __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc)); + + /* Set the relevant bits. */ + xnew_exc &= ~(excepts & FE_ALL_EXCEPT); + xnew_exc |= *flagp & excepts & FE_ALL_EXCEPT; + + /* Put the new data in effect. */ + __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc)); + } + + /* Success. */ + return 0; +} + +#include <shlib-compat.h> +#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) +strong_alias (__fesetexceptflag, __old_fesetexceptflag) +compat_symbol (libm, __old_fesetexceptflag, fesetexceptflag, GLIBC_2_1); +#endif + +versioned_symbol (libm, __fesetexceptflag, fesetexceptflag, GLIBC_2_2); |