mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
79 lines
2.0 KiB
C
79 lines
2.0 KiB
C
/* Copyright (C) 1997-2020 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU C Library.
|
|
|
|
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>
|
|
#include <fpu_control.h>
|
|
|
|
int
|
|
__fesetenv (const fenv_t *envp)
|
|
{
|
|
fpu_control_t fpcr;
|
|
fpu_control_t fpcr_new;
|
|
fpu_control_t updated_fpcr;
|
|
fpu_fpsr_t fpsr;
|
|
fpu_fpsr_t fpsr_new;
|
|
|
|
_FPU_GETCW (fpcr);
|
|
|
|
if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV))
|
|
{
|
|
/* The new FPCR/FPSR are valid, so don't merge the reserved flags. */
|
|
fpcr_new = envp->__fpcr;
|
|
|
|
if (fpcr != fpcr_new)
|
|
_FPU_SETCW (fpcr_new);
|
|
|
|
_FPU_SETFPSR (envp->__fpsr);
|
|
return 0;
|
|
}
|
|
|
|
_FPU_GETFPSR (fpsr);
|
|
fpcr_new = fpcr & _FPU_RESERVED;
|
|
fpsr_new = fpsr & _FPU_FPSR_RESERVED;
|
|
|
|
if (envp == FE_DFL_ENV)
|
|
{
|
|
fpcr_new |= _FPU_DEFAULT;
|
|
fpsr_new |= _FPU_FPSR_DEFAULT;
|
|
}
|
|
else
|
|
{
|
|
fpcr_new |= _FPU_FPCR_IEEE;
|
|
fpsr_new |= _FPU_FPSR_IEEE;
|
|
}
|
|
|
|
_FPU_SETFPSR (fpsr_new);
|
|
|
|
if (fpcr != fpcr_new)
|
|
{
|
|
_FPU_SETCW (fpcr_new);
|
|
|
|
/* Trapping exceptions are optional in AArch64; the relevant enable
|
|
bits in FPCR are RES0 hence the absence of support can be detected
|
|
by reading back the FPCR and comparing with the required value. */
|
|
_FPU_GETCW (updated_fpcr);
|
|
|
|
return fpcr_new & ~updated_fpcr;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
libm_hidden_def (__fesetenv)
|
|
weak_alias (__fesetenv, fesetenv)
|
|
libm_hidden_weak (fesetenv)
|