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57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/* Set floating-point environment exception handling.
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Copyright (C) 1998-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Alexandre Oliva <aoliva@redhat.com>
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based on corresponding file in the MIPS port.
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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.h>
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#include <fpu_control.h>
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#include <shlib-compat.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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fpu_control_t cw, temp;
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/* Get the current exceptions. */
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_FPU_GETCW (cw);
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/* Make sure the flags we want restored are legal. */
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excepts &= FE_ALL_EXCEPT;
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temp = *flagp & excepts;
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/* If EF bits are clear and the user requests them to be set,
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we have to fail, because there's no way to do it. */
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if (~(cw & excepts) & temp)
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return -1;
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/* We clear EF bits by storing a 1 in them, so flip the
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FE_ALL_EXCEPT bits. */
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temp = (~temp & FE_ALL_EXCEPT);
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/* Now clear the bits called for, and copy them in from flagp. Note that
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we ignore all non-flag bits from *flagp, so they don't matter. */
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cw = (cw & ~FE_ALL_EXCEPT) | temp;
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_FPU_SETFCW (cw);
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/* Success. */
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return 0;
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}
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versioned_symbol (libm, __fesetexceptflag, fesetexceptflag, GLIBC_2_2);
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