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/* Set floating-point environment exception handling.
Copyright (C) 2000-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).
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_libc.h>
#include <math.h>
#include <fpu_control.h>
int
fesetexceptflag (const fexcept_t *flagp, int excepts)
{
fexcept_t fpc, fpc_new;
/* Get the current environment. We have to do this since we cannot
separately set the status word. */
_FPU_GETCW (fpc);
/* Clear the current exception bits. */
fpc_new = fpc & ~((excepts & FE_ALL_EXCEPT) << FPC_FLAGS_SHIFT);
if ((fpc & FPC_NOT_FPU_EXCEPTION) == 0)
/* Bits 6, 7 of dxc-byte are zero,
thus bits 0-5 of dxc-byte correspond to the flag-bits.
Clear given exceptions in dxc-field. */
fpc_new &= ~((excepts & FE_ALL_EXCEPT) << FPC_DXC_SHIFT);
/* Set exceptions from flagp in flags-field. */
fpc_new |= (*flagp & excepts & FE_ALL_EXCEPT) << FPC_FLAGS_SHIFT;
/* Store the new status word (along with the rest of the environment.
Possibly new exceptions are set but they won't get executed. */
_FPU_SETCW (fpc_new);
/* Success. */
return 0;
}
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