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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/s390/fpu/fsetexcptflg.c
1 /* Set floating-point environment exception handling.
2 Copyright (C) 2000-2018 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
20 #include <fenv_libc.h>
22 #include <fpu_control.h>
25 fesetexceptflag (const fexcept_t
*flagp
, int excepts
)
27 fexcept_t temp
, newexcepts
;
29 /* Get the current environment. We have to do this since we cannot
30 separately set the status word. */
32 /* Install the new exception bits in the Accrued Exception Byte. */
33 excepts
= excepts
& FE_ALL_EXCEPT
;
34 newexcepts
= excepts
<< FPC_FLAGS_SHIFT
;
36 if ((temp
& FPC_NOT_FPU_EXCEPTION
) == 0)
37 /* Bits 6, 7 of dxc-byte are zero,
38 thus bits 0-5 of dxc-byte correspond to the flag-bits.
39 Clear given exceptions in dxc-field. */
40 temp
&= ~(excepts
<< FPC_DXC_SHIFT
);
42 /* Integrate dxc-byte of flagp into flags. The dxc-byte of flagp contains
43 either an ieee-exception or 0 (see fegetexceptflag). */
44 temp
|= (*flagp
| ((*flagp
>> FPC_DXC_SHIFT
) << FPC_FLAGS_SHIFT
))
47 /* Store the new status word (along with the rest of the environment.
48 Possibly new exceptions are set but they won't get executed. */