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