mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/* Install given floating-point environment and raise exceptions.
|
|
Copyright (C) 1997-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
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
|
|
__feupdateenv (const fenv_t *envp)
|
|
{
|
|
fpu_control_t fpscr, new_fpscr, updated_fpscr;
|
|
int excepts;
|
|
|
|
/* Fail if a VFP unit isn't present. */
|
|
if (!ARM_HAVE_VFP)
|
|
return 1;
|
|
|
|
_FPU_GETCW (fpscr);
|
|
excepts = fpscr & FE_ALL_EXCEPT;
|
|
|
|
if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV))
|
|
{
|
|
/* Merge current exception flags with the saved fenv. */
|
|
new_fpscr = envp->__cw | excepts;
|
|
|
|
/* Write new FPSCR if different (ignoring NZCV flags). */
|
|
if (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0)
|
|
_FPU_SETCW (new_fpscr);
|
|
|
|
/* Raise the exceptions if enabled in the new FP state. */
|
|
if (excepts & (new_fpscr >> FE_EXCEPT_SHIFT))
|
|
return __feraiseexcept (excepts);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Preserve the reserved FPSCR flags. */
|
|
new_fpscr = fpscr & (_FPU_RESERVED | FE_ALL_EXCEPT);
|
|
new_fpscr |= (envp == FE_DFL_ENV) ? _FPU_DEFAULT : _FPU_IEEE;
|
|
|
|
if (((new_fpscr ^ fpscr) & ~_FPU_MASK_NZCV) != 0)
|
|
{
|
|
_FPU_SETCW (new_fpscr);
|
|
|
|
/* Not all VFP architectures support trapping exceptions, so
|
|
test whether the relevant bits were set and fail if not. */
|
|
_FPU_GETCW (updated_fpscr);
|
|
|
|
if (new_fpscr & ~updated_fpscr)
|
|
return 1;
|
|
}
|
|
|
|
/* Raise the exceptions if enabled in the new FP state. */
|
|
if (excepts & (new_fpscr >> FE_EXCEPT_SHIFT))
|
|
return __feraiseexcept (excepts);
|
|
|
|
return 0;
|
|
}
|
|
libm_hidden_def (__feupdateenv)
|
|
weak_alias (__feupdateenv, feupdateenv)
|
|
libm_hidden_weak (feupdateenv)
|