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* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/* Implement frexp for m68k.
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Copyright (C) 1996-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 <math.h>
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FLOAT
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M_DECL_FUNC (__frexp) (FLOAT value, int *expptr)
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{
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FLOAT mantissa, exponent;
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int iexponent;
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unsigned long fpsr;
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__asm ("ftst%.x %1\n"
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"fmove%.l %/fpsr, %0"
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: "=dm" (fpsr) : "f" (value));
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if (fpsr & (7 << 24))
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{
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/* Not finite or zero. */
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*expptr = 0;
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return value;
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}
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__asm ("fgetexp%.x %1, %0" : "=f" (exponent) : "f" (value));
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iexponent = (int) exponent + 1;
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*expptr = iexponent;
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__asm ("fscale%.l %2, %0"
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: "=f" (mantissa)
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: "0" (value), "dmi" (-iexponent));
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return mantissa;
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}
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declare_mgen_alias (__frexp, frexp)
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