75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
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/* mpf_mul_ui -- Multiply a float and an unsigned integer.
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Copyright (C) 1993, 1994, 1996 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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void
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#if __STDC__
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mpf_mul_ui (mpf_ptr r, mpf_srcptr u, unsigned long int v)
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#else
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mpf_mul_ui (r, u, v)
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mpf_ptr r;
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mpf_srcptr u;
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unsigned long int v;
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#endif
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{
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mp_srcptr up;
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mp_size_t usize;
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mp_size_t size;
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mp_size_t prec = r->_mp_prec;
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mp_limb_t cy_limb;
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mp_ptr rp;
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usize = u->_mp_size;
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size = ABS (usize);
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rp = r->_mp_d;
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up = u->_mp_d;
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if (size > prec)
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{
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up += size - prec;
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size = prec;
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}
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#if 0
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/* Since we can do it at almost no cost, remove zero limbs at low end of
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result. */
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if (up[0] == 0)
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up++, size--;
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#endif
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if (size == 0 || v == 0)
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{
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r->_mp_size = 0;
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r->_mp_exp = 0; /* ??? */
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}
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else
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{
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cy_limb = mpn_mul_1 (rp, up, size, (mp_limb_t) v);
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rp[size] = cy_limb;
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cy_limb = cy_limb != 0;
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r->_mp_exp = u->_mp_exp + cy_limb;
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size += cy_limb;
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r->_mp_size = usize >= 0 ? size : -size;
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}
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}
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