mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
/* Set current rounding direction.
|
|
Copyright (C) 2000-2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by David Huggins-Daines <dhd@debian.org>, 2000
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library. If not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <fenv.h>
|
|
|
|
int
|
|
__fesetround (int round)
|
|
{
|
|
union { unsigned long long l; unsigned int sw[2]; } s;
|
|
|
|
if (round & ~FE_DOWNWARD)
|
|
/* round is not a valid rounding mode. */
|
|
return 1;
|
|
|
|
/* Get the current status word. */
|
|
__asm__ ("fstd %%fr0,0(%1)" : "=m" (s.l) : "r" (&s.l) : "%r0");
|
|
s.sw[0] &= ~FE_DOWNWARD;
|
|
s.sw[0] |= round & FE_DOWNWARD;
|
|
__asm__ ("fldd 0(%0),%%fr0" : : "r" (&s.l), "m" (s.l) : "%r0");
|
|
|
|
return 0;
|
|
}
|
|
|
|
libm_hidden_def (__fesetround)
|
|
weak_alias (__fesetround, fesetround)
|
|
libm_hidden_weak (fesetround)
|