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Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/scale2.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/scale2.c | 91 |
1 files changed, 0 insertions, 91 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/scale2.c b/Build/source/libs/mpfr/mpfr-src/src/scale2.c deleted file mode 100644 index 5f5528a3616..00000000000 --- a/Build/source/libs/mpfr/mpfr-src/src/scale2.c +++ /dev/null @@ -1,91 +0,0 @@ -/* mpfr_scale2 -- multiply a double float by 2^exp - -Copyright 1999-2020 Free Software Foundation, Inc. -Contributed by the AriC 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/ or write to the Free Software Foundation, Inc., -51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ - -#include <float.h> /* for DBL_EPSILON */ -#include "mpfr-impl.h" - -/* Note: we could use the ldexp function, but since we want not to depend on - math.h, we write our own implementation. */ - -/* multiplies 1/2 <= d <= 1 by 2^exp */ -double -mpfr_scale2 (double d, int exp) -{ -#if _MPFR_IEEE_FLOATS - { - union mpfr_ieee_double_extract x; - - if (MPFR_UNLIKELY (d == 1.0)) - { - d = 0.5; - exp ++; - } - - /* now 1/2 <= d < 1 */ - - /* infinities and zeroes have already been checked */ - MPFR_ASSERTD (-1073 <= exp && exp <= 1025); - - x.d = d; - if (MPFR_UNLIKELY (exp < -1021)) /* subnormal case */ - { - x.s.exp += exp + 52; - x.d *= DBL_EPSILON; - } - else /* normalized case */ - { - x.s.exp += exp; - } - return x.d; - } -#else /* _MPFR_IEEE_FLOATS */ - { - double factor; - - /* An overflow may occurs (example: 0.5*2^1024) */ - if (d < 1.0) - { - d += d; - exp--; - } - /* Now 1.0 <= d < 2.0 */ - - if (exp < 0) - { - factor = 0.5; - exp = -exp; - } - else - { - factor = 2.0; - } - while (exp != 0) - { - if ((exp & 1) != 0) - d *= factor; - exp >>= 1; - factor *= factor; - } - return d; - } -#endif /* _MPFR_IEEE_FLOATS */ -} |