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.
57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/* __gmpfr_floor_log2 - returns floor(log(d)/log(2))
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Copyright 1999-2004, 2006-2025 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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/* returns floor(log2(d)) */
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long
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__gmpfr_floor_log2 (double d)
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{
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long exp;
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#if _MPFR_IEEE_FLOATS
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union mpfr_ieee_double_extract x;
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x.d = d;
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/* The cast below is useless in theory, but let us not depend on the
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integer promotion rules (for instance, tcc is currently wrong). */
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exp = (long) x.s.exp - 1023;
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MPFR_ASSERTN (exp < 1023); /* fail on infinities */
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return exp;
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#else /* _MPFR_IEEE_FLOATS */
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double m;
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MPFR_ASSERTD (d >= 0);
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if (d >= 1.0)
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{
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exp = -1;
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for (m = 1.0; m <= d; m *= 2.0)
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exp++;
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}
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else
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{
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exp = 0;
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for (m = 1.0; m > d; m *= 0.5)
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exp--;
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}
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return exp;
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#endif /* _MPFR_IEEE_FLOATS */
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}
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