sysdeps/powerpc/fpu/fsetexcptflg.c

   1 /* Set floating-point environment exception handling.
   2    Copyright (C) 1997,99,2000,01 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <fenv_libc.h>
  21 #include <bp-sym.h>
  22
  23 int
  24 __fesetexceptflag (const fexcept_t *flagp, int excepts)
  25 {
  26   fenv_union_t u;
  27   fexcept_t flag;
  28
  29   /* Get the current state.  */
  30   u.fenv = fegetenv_register ();
  31
  32   /* Ignore exceptions not listed in 'excepts'.  */
  33   flag = *flagp & excepts;
  34
  35   /* Replace the exception status */
  36   u.l[1] = ((u.l[1] & ~(FPSCR_STICKY_BITS & excepts))
  37             | (flag & FPSCR_STICKY_BITS)
  38             | (flag >> ((31 - FPSCR_VX) - (31 - FPSCR_VXSOFT))
  39                & FE_INVALID_SOFTWARE));
  40
  41   /* Store the new status word (along with the rest of the environment).
  42      This may cause floating-point exceptions if the restored state
  43      requests it.  */
  44   fesetenv_register (u.fenv);
  45
  46   /* Deal with FE_INVALID_SOFTWARE not being implemented on some chips.  */
  47   if (flag & FE_INVALID)
  48     feraiseexcept(FE_INVALID);
  49
  50   /* Success.  */
  51   return 0;
  52 }
  53
  54 #include <shlib-compat.h>
  55 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  56 strong_alias (__fesetexceptflag, __old_fesetexceptflag)
  57 compat_symbol (libm, BP_SYM (__old_fesetexceptflag), BP_SYM (fesetexceptflag), GLIBC_2_1);
  58 #endif
  59
  60 versioned_symbol (libm, BP_SYM (__fesetexceptflag), BP_SYM (fesetexceptflag), GLIBC_2_2);