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4c74403188
Change-Id: Iae65e95cfa0d92091b8b0a424ae36d88efa76aa9 Reviewed-on: https://review.haiku-os.org/c/buildtools/+/3020 Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* mpf_reldiff -- Generate the relative difference of two floats.
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Copyright 1996, 2001, 2004, 2005 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 either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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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 General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#include "gmp-impl.h"
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/* The precision we use for d = x-y is based on what mpf_div will want from
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the dividend. It calls mpn_div_q to produce a quotient of rprec+1 limbs.
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So rprec+1 == dsize - xsize + 1, hence dprec = rprec+xsize. */
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void
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mpf_reldiff (mpf_t rdiff, mpf_srcptr x, mpf_srcptr y)
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{
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if (UNLIKELY (SIZ(x) == 0))
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{
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mpf_set_ui (rdiff, (unsigned long int) (mpf_sgn (y) != 0));
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}
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else
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{
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mp_size_t dprec;
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mpf_t d;
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TMP_DECL;
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TMP_MARK;
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dprec = PREC(rdiff) + ABSIZ(x);
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ASSERT (PREC(rdiff)+1 == dprec - ABSIZ(x) + 1);
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PREC(d) = dprec;
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PTR(d) = TMP_ALLOC_LIMBS (dprec + 1);
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mpf_sub (d, x, y);
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SIZ(d) = ABSIZ(d);
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mpf_div (rdiff, d, x);
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TMP_FREE;
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}
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}
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