49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/* Set floating-point environment exception handling.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <fenv_libc.h>
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void
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fesetexceptflag (const fexcept_t *flagp, int excepts)
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{
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fenv_union_t u;
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fexcept_t flag;
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/* Get the current state. */
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u.fenv = fegetenv_register ();
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/* Ignore exceptions not listed in 'excepts'. */
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flag = *flagp & excepts;
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/* Replace the exception status */
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u.l[1] = (u.l[1] & ~(FPSCR_STICKY_BITS & excepts)
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| flag & FPSCR_STICKY_BITS
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| (flag >> (31 - FPSCR_VX) - (31 - FPSCR_VXSOFT)
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& FE_INVALID_SOFTWARE));
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/* Store the new status word (along with the rest of the environment).
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This may cause floating-point exceptions if the restored state
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requests it. */
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fesetenv_register (u.fenv);
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/* Deal with FE_INVALID_SOFTWARE not being implemented on some chips. */
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if (flag & FE_INVALID)
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feraiseexcept(FE_INVALID);
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}
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