diff options
Diffstat (limited to 'REORG.TODO/math/e_scalb.c')
-rw-r--r-- | REORG.TODO/math/e_scalb.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/REORG.TODO/math/e_scalb.c b/REORG.TODO/math/e_scalb.c new file mode 100644 index 0000000000..d4a31c1d98 --- /dev/null +++ b/REORG.TODO/math/e_scalb.c @@ -0,0 +1,54 @@ +/* Copyright (C) 2011-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. + + The GNU C 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 2.1 of the License, or (at your option) any later version. + + The GNU C 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 C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <math.h> +#include <math_private.h> + + +static double +__attribute__ ((noinline)) +invalid_fn (double x, double fn) +{ + if (__rint (fn) != fn) + return (fn - fn) / (fn - fn); + else if (fn > 65000.0) + return __scalbn (x, 65000); + else + return __scalbn (x,-65000); +} + + +double +__ieee754_scalb (double x, double fn) +{ + if (__glibc_unlikely (isnan (x))) + return x * fn; + if (__glibc_unlikely (!isfinite (fn))) + { + if (isnan (fn) || fn > 0.0) + return x * fn; + if (x == 0.0) + return x; + return x / -fn; + } + if (__glibc_unlikely (fabs (fn) >= 0x1p31 || (double) (int) fn != fn)) + return invalid_fn (x, fn); + + return __scalbn (x, (int) fn); +} +strong_alias (__ieee754_scalb, __scalb_finite) |