sysdeps/powerpc/fpu/fsetexcptflg.c

   1 /* Set floating-point environment exception handling.
   2    Copyright (C) 1997-2014 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <fenv_libc.h>
  20
  21 int
  22 __fesetexceptflag (const fexcept_t *flagp, int excepts)
  23 {
  24   fenv_union_t u, n;
  25   fexcept_t flag;
  26
  27   /* Get the current state.  */
  28   u.fenv = fegetenv_register ();
  29
  30   /* Ignore exceptions not listed in 'excepts'.  */
  31   flag = *flagp & excepts;
  32
  33   /* Replace the exception status */
  34   n.l = ((u.l & ~(FPSCR_STICKY_BITS & excepts))
  35          | (flag & FPSCR_STICKY_BITS)
  36          | (flag >> ((31 - FPSCR_VX) - (31 - FPSCR_VXSOFT))
  37             & FE_INVALID_SOFTWARE));
  38
  39   /* Store the new status word (along with the rest of the environment).
  40      This may cause floating-point exceptions if the restored state
  41      requests it.  */
  42   if (n.l != u.l)
  43     fesetenv_register (u.fenv);
  44
  45   /* Deal with FE_INVALID_SOFTWARE not being implemented on some chips.  */
  46   if (flag & FE_INVALID)
  47     feraiseexcept(FE_INVALID);
  48
  49   /* Success.  */
  50   return 0;
  51 }
  52
  53 #include <shlib-compat.h>
  54 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  55 strong_alias (__fesetexceptflag, __old_fesetexceptflag)
  56 compat_symbol (libm, __old_fesetexceptflag, fesetexceptflag, GLIBC_2_1);
  57 #endif
  58
  59 versioned_symbol (libm, __fesetexceptflag, fesetexceptflag, GLIBC_2_2);