mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 07:20:11 +00:00
001f7b773c
writes if the FPSCR remains unchanged. 2014-06-24 Wilco <wdijkstr@arm.com> * sysdeps/arm/fclrexcpt.c (feclearexcept): Optimize to avoid unnecessary FPSCR writes. * sysdeps/arm/fedisblxcpt.c (fedisableexcept): Likewise. * sysdeps/arm/feenablxcpt.c (feenableexcept): Likewise. * sysdeps/arm/fsetexcptflg.c (fesetexceptflag): Likewise. * sysdeps/arm/setfpucw.c (__setfpucw): Likewise.
44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/* Disable floating-point exceptions.
|
|
Copyright (C) 2001-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Philip Blundell <philb@gnu.org>, 2001.
|
|
|
|
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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <fenv.h>
|
|
#include <fpu_control.h>
|
|
#include <arm-features.h>
|
|
|
|
|
|
int
|
|
fedisableexcept (int excepts)
|
|
{
|
|
fpu_control_t fpscr, new_fpscr;
|
|
|
|
/* Fail if a VFP unit isn't present. */
|
|
if (!ARM_HAVE_VFP)
|
|
return -1;
|
|
|
|
_FPU_GETCW (fpscr);
|
|
excepts &= FE_ALL_EXCEPT;
|
|
new_fpscr = fpscr & ~(excepts << FE_EXCEPT_SHIFT);
|
|
|
|
/* Write new exceptions if changed. */
|
|
if (new_fpscr != fpscr)
|
|
_FPU_SETCW (new_fpscr);
|
|
|
|
return (fpscr >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT;
|
|
}
|