1 /* Set floating-point environment exception handling.
2 Copyright (C) 1997 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #include <fenv_libc.h>
23 fesetexceptflag (const fexcept_t
*flagp
, int excepts
)
28 /* Get the current state. */
29 u
.fenv
= fegetenv_register ();
31 /* Ignore exceptions not listed in 'excepts'. */
32 flag
= *flagp
& excepts
;
34 /* Replace the exception status */
35 u
.l
[1] = (u
.l
[1] & ~(FPSCR_STICKY_BITS
& excepts
)
36 | flag
& FPSCR_STICKY_BITS
37 | (flag
>> (31 - FPSCR_VX
) - (31 - FPSCR_VXSOFT
)
38 & FE_INVALID_SOFTWARE
));
40 /* Store the new status word (along with the rest of the environment).
41 This may cause floating-point exceptions if the restored state
43 fesetenv_register (u
.fenv
);
45 /* Deal with FE_INVALID_SOFTWARE not being implemented on some chips. */
46 if (flag
& FE_INVALID
)
47 feraiseexcept(FE_INVALID
);