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/* Install given floating-point environment.
Copyright (C) 1998-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Alexandre Oliva <aoliva@redhat.com>
based on corresponding file in the MIPS port.
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 <shlib-compat.h>
int
__fesetenv (const fenv_t *envp)
{
fpu_control_t cw;
/* We want to clear all EF bits for the default end IEEE. */
if (envp == FE_DFL_ENV)
_FPU_SETFCW (_FPU_DEFAULT|FE_ALL_EXCEPT);
else if (envp == FE_NOMASK_ENV)
_FPU_SETFCW (_FPU_IEEE|FE_ALL_EXCEPT);
else
{
fpu_control_t temp;
_FPU_GETCW (temp);
cw = *envp;
/* If EF bits are cleared and the user requests them to be set,
we have to fail, because there's no way to do it. */
if (~temp & cw & FE_ALL_EXCEPT)
return -1;
/* We clear EF bits by storing a 1 in them, so flip the
FE_ALL_EXCEPT bits. */
cw = (cw & ~FE_ALL_EXCEPT) | (~cw & FE_ALL_EXCEPT);
_FPU_SETFCW (cw);
}
/* Success. */
return 0;
}
libm_hidden_ver (__fesetenv, fesetenv)
versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2);
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