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.
139 lines
3.9 KiB
C
139 lines
3.9 KiB
C
/* mpfr_mul_ui -- multiply a floating-point number by a machine integer
|
|
|
|
Copyright 1999-2025 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/>. */
|
|
|
|
#define MPFR_NEED_LONGLONG_H
|
|
#include "mpfr-impl.h"
|
|
|
|
#undef mpfr_mul_ui
|
|
MPFR_HOT_FUNCTION_ATTR int
|
|
mpfr_mul_ui (mpfr_ptr y, mpfr_srcptr x, unsigned long int u, mpfr_rnd_t rnd_mode)
|
|
{
|
|
int inexact;
|
|
|
|
if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (x)))
|
|
{
|
|
if (MPFR_IS_NAN (x))
|
|
{
|
|
MPFR_SET_NAN (y);
|
|
MPFR_RET_NAN;
|
|
}
|
|
else if (MPFR_IS_INF (x))
|
|
{
|
|
if (u != 0)
|
|
{
|
|
MPFR_SET_INF (y);
|
|
MPFR_SET_SAME_SIGN (y, x);
|
|
MPFR_RET (0); /* infinity is exact */
|
|
}
|
|
else /* 0 * infinity */
|
|
{
|
|
MPFR_SET_NAN (y);
|
|
MPFR_RET_NAN;
|
|
}
|
|
}
|
|
else /* x is zero */
|
|
{
|
|
MPFR_ASSERTD (MPFR_IS_ZERO (x));
|
|
MPFR_SET_ZERO (y);
|
|
MPFR_SET_SAME_SIGN (y, x);
|
|
MPFR_RET (0); /* zero is exact */
|
|
}
|
|
}
|
|
else if (u <= 1)
|
|
{
|
|
if (u < 1)
|
|
{
|
|
MPFR_SET_ZERO (y);
|
|
MPFR_SET_SAME_SIGN (y, x);
|
|
MPFR_RET (0); /* zero is exact */
|
|
}
|
|
else
|
|
return mpfr_set (y, x, rnd_mode);
|
|
}
|
|
else if (MPFR_UNLIKELY (IS_POW2 (u)))
|
|
return mpfr_mul_2si (y, x, MPFR_INT_CEIL_LOG2 (u), rnd_mode);
|
|
|
|
#ifdef MPFR_LONG_WITHIN_LIMB
|
|
{
|
|
mp_limb_t *yp;
|
|
mp_size_t xn;
|
|
int cnt;
|
|
MPFR_TMP_DECL (marker);
|
|
|
|
yp = MPFR_MANT (y);
|
|
xn = MPFR_LIMB_SIZE (x);
|
|
|
|
MPFR_ASSERTD (xn < MP_SIZE_T_MAX);
|
|
MPFR_TMP_MARK(marker);
|
|
yp = MPFR_TMP_LIMBS_ALLOC (xn + 1);
|
|
|
|
MPFR_ASSERTN (u == (mp_limb_t) u);
|
|
yp[xn] = mpn_mul_1 (yp, MPFR_MANT (x), xn, u);
|
|
|
|
/* x * u is stored in yp[xn], ..., yp[0] */
|
|
|
|
/* since the case u=1 was treated above, we have u >= 2, thus
|
|
yp[xn] >= 1 since x was msb-normalized */
|
|
MPFR_ASSERTD (yp[xn] != 0);
|
|
if (MPFR_LIKELY (MPFR_LIMB_MSB (yp[xn]) == 0))
|
|
{
|
|
count_leading_zeros (cnt, yp[xn]);
|
|
mpn_lshift (yp, yp, xn + 1, cnt);
|
|
}
|
|
else
|
|
{
|
|
cnt = 0;
|
|
}
|
|
|
|
/* now yp[xn], ..., yp[0] is msb-normalized too, and has at most
|
|
PREC(x) + (GMP_NUMB_BITS - cnt) non-zero bits */
|
|
MPFR_RNDRAW (inexact, y, yp, (mpfr_prec_t) (xn + 1) * GMP_NUMB_BITS,
|
|
rnd_mode, MPFR_SIGN (x), cnt -- );
|
|
|
|
MPFR_TMP_FREE (marker);
|
|
|
|
cnt = GMP_NUMB_BITS - cnt;
|
|
if (MPFR_UNLIKELY (__gmpfr_emax < MPFR_EMAX_MIN + cnt
|
|
|| MPFR_GET_EXP (x) > __gmpfr_emax - cnt))
|
|
return mpfr_overflow (y, rnd_mode, MPFR_SIGN(x));
|
|
|
|
MPFR_SET_EXP (y, MPFR_GET_EXP (x) + cnt);
|
|
MPFR_SET_SAME_SIGN (y, x);
|
|
MPFR_RET (inexact);
|
|
}
|
|
#else
|
|
{
|
|
mpfr_t uu;
|
|
MPFR_SAVE_EXPO_DECL (expo);
|
|
|
|
mpfr_init2 (uu, sizeof (unsigned long) * CHAR_BIT);
|
|
/* Warning: u might be outside the current exponent range! */
|
|
MPFR_SAVE_EXPO_MARK (expo);
|
|
mpfr_set_ui (uu, u, MPFR_RNDZ);
|
|
inexact = mpfr_mul (y, x, uu, rnd_mode);
|
|
mpfr_clear (uu);
|
|
MPFR_SAVE_EXPO_UPDATE_FLAGS (expo, __gmpfr_flags);
|
|
MPFR_SAVE_EXPO_FREE (expo);
|
|
return mpfr_check_range (y, inexact, rnd_mode);
|
|
}
|
|
#endif /* MPFR_LONG_WITHIN_LIMB */
|
|
}
|