diff options
Diffstat (limited to 'math/e_scalb_template.c')
-rw-r--r-- | math/e_scalb_template.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/math/e_scalb_template.c b/math/e_scalb_template.c new file mode 100644 index 0000000000..ed0508c7bf --- /dev/null +++ b/math/e_scalb_template.c @@ -0,0 +1,57 @@ +/* Multiply by integral power of radix. + + Copyright (C) 2011-2020 Free Software Foundation, Inc. + + This file is part of the GNU C Library. + + 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 + <https://www.gnu.org/licenses/>. */ + +#include <math.h> +#include <math_private.h> +#include <libm-alias-finite.h> + +static FLOAT +__attribute__ ((noinline)) +invalid_fn (FLOAT x, FLOAT fn) +{ + if (M_SUF (rint) (fn) != fn) + return (fn - fn) / (fn - fn); + else if (fn > M_LIT (65000.0)) + return M_SUF (__scalbn) (x, 65000); + else + return M_SUF (__scalbn) (x,-65000); +} + + +FLOAT +M_DECL_FUNC (__ieee754_scalb) (FLOAT x, FLOAT fn) +{ + if (__glibc_unlikely (isnan (x))) + return x * fn; + if (__glibc_unlikely (!isfinite (fn))) + { + if (isnan (fn) || fn > M_LIT (0.0)) + return x * fn; + if (x == M_LIT (0.0)) + return x; + return x / -fn; + } + if (__glibc_unlikely (M_FABS (fn) >= M_LIT (0x1p31) + || (FLOAT) (int) fn != fn)) + return invalid_fn (x, fn); + + return M_SCALBN (x, (int) fn); +} +declare_mgen_finite_alias (__ieee754_scalb, __scalb) |