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.
50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* mpfr_powerof2_raw -- test whether a floating-point number is a power of 2
|
|
|
|
Copyright 2002-2025 Free Software Foundation, Inc.
|
|
Contributed by the Pascaline and Caramba projects, INRIA.
|
|
|
|
This file is part of the GNU MPFR Library.
|
|
|
|
The GNU MPFR Library is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The GNU MPFR Library is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with the GNU MPFR Library; see the file COPYING.LESSER.
|
|
If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
#include "mpfr-impl.h"
|
|
|
|
/* This is an internal function and one assumes that x is a non-special
|
|
* number (more precisely, only its significand is considered and this
|
|
* function can be used even if the exponent field of x has not been
|
|
* initialized). It returns 1 (true) if |x| is a power of 2, else 0.
|
|
*/
|
|
|
|
int
|
|
mpfr_powerof2_raw (mpfr_srcptr x)
|
|
{
|
|
/* This is an internal function, and we may call it with some
|
|
wrong numbers (ie good mantissa but wrong flags or exp)
|
|
So we don't want to test if it is a pure FP.
|
|
MPFR_ASSERTN(MPFR_IS_PURE_FP(x)); */
|
|
return mpfr_powerof2_raw2 (MPFR_MANT(x), MPFR_LIMB_SIZE(x));
|
|
}
|
|
|
|
int
|
|
mpfr_powerof2_raw2 (const mp_limb_t *xp, mp_size_t xn)
|
|
{
|
|
if (xp[--xn] != MPFR_LIMB_HIGHBIT)
|
|
return 0;
|
|
while (xn > 0)
|
|
if (xp[--xn] != 0)
|
|
return 0;
|
|
return 1;
|
|
}
|