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59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/* Enable floating-point exceptions.
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Copyright (C) 2000-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Geoffrey Keating <geoffk@geoffk.org>, 2000.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <fenv_libc.h>
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int
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feenableexcept (int excepts)
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{
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fenv_union_t fe, curr;
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int result, new;
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/* Get current exception mask to return. */
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fe.fenv = curr.fenv = fegetenv_register ();
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result = fenv_reg_to_exceptions (fe.l);
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if ((excepts & FE_ALL_INVALID) == FE_ALL_INVALID)
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excepts = (excepts | FE_INVALID) & ~ FE_ALL_INVALID;
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/* Sets the new exception mask. */
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if (excepts & FE_INEXACT)
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fe.l |= (1 << (31 - FPSCR_XE));
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if (excepts & FE_DIVBYZERO)
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fe.l |= (1 << (31 - FPSCR_ZE));
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if (excepts & FE_UNDERFLOW)
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fe.l |= (1 << (31 - FPSCR_UE));
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if (excepts & FE_OVERFLOW)
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fe.l |= (1 << (31 - FPSCR_OE));
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if (excepts & FE_INVALID)
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fe.l |= (1 << (31 - FPSCR_VE));
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if (fe.l != curr.l)
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fesetenv_register (fe.fenv);
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new = __fegetexcept ();
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if (new != 0 && result == 0)
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(void) __fe_nomask_env_priv ();
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if ((new & excepts) != excepts)
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result = -1;
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return result;
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}
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