vasilito
ff4ff35918
Red Bear OS is a full fork. All sources must be available from git clone with zero network access. Removed gitignore rules that excluded fetched source trees under recipes/*/source/, local/recipes/kde/*/source/, local/recipes/qt/*/source/, and vendor source trees. Build artifacts (target/, build/, source.tar, *.o, *.so) remain excluded. 127291 files added — kernel, relibc, base, bootloader, pkgar, all KDE/Qt frameworks, mesa, wayland, DRM drivers, and every other recipe source.
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/* mpfr_reldiff -- compute relative difference of two floating-point numbers.
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Copyright 2000-2001, 2004-2025 Free Software Foundation, Inc.
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Contributed by the Pascaline and Caramba projects, INRIA.
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This file is part of the GNU MPFR Library.
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The GNU MPFR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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The GNU MPFR 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 Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MPFR Library; see the file COPYING.LESSER.
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If not, see <https://www.gnu.org/licenses/>. */
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#include "mpfr-impl.h"
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/* reldiff(b, c) = abs(b-c)/b */
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void
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mpfr_reldiff (mpfr_ptr a, mpfr_srcptr b, mpfr_srcptr c, mpfr_rnd_t rnd_mode)
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{
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mpfr_t b_copy;
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if (MPFR_ARE_SINGULAR (b, c))
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{
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if (MPFR_IS_NAN (b) || MPFR_IS_INF (b) || MPFR_IS_NAN (c) ||
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(MPFR_IS_ZERO (b) && MPFR_IS_ZERO (c)))
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{
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MPFR_SET_NAN (a);
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return;
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}
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if (MPFR_IS_ZERO (b) || MPFR_IS_INF (c))
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{
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MPFR_SET_SAME_SIGN (a, b);
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MPFR_SET_INF (a);
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return;
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}
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/* The case c = 0 with b regular, which should give sign(b) exactly,
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cannot be optimized here as it is documented in the MPFR manual
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that this function just computes abs(b-c)/b using the precision
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of a and the rounding mode rnd_mode for all operations. So let's
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prefer the potentially "incorrect" result. Note that the correct
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result is not necessarily better because if could break properties
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(like monotonicity?) implied by the documentation. */
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}
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if (a == b)
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{
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mpfr_init2 (b_copy, MPFR_PREC(b));
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mpfr_set (b_copy, b, MPFR_RNDN);
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}
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mpfr_sub (a, b, c, rnd_mode);
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MPFR_SET_SIGN (a, 1);
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mpfr_div (a, a, a == b ? b_copy : b, rnd_mode);
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if (a == b)
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mpfr_clear (b_copy);
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}
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