diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/e_exp10.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/e_exp10.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/e_exp10.c b/sysdeps/ieee754/dbl-64/e_exp10.c new file mode 100644 index 0000000000..eeb63a6986 --- /dev/null +++ b/sysdeps/ieee754/dbl-64/e_exp10.c @@ -0,0 +1,48 @@ +/* Copyright (C) 2012 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 + <http://www.gnu.org/licenses/>. */ + +#include <math.h> +#include <math_private.h> +#include <float.h> + +static const double log10_high = 0x2.4d7637p0; +static const double log10_low = 0x7.6aaa2b05ba95cp-28; + +double +__ieee754_exp10 (double arg) +{ + int32_t lx; + double arg_high, arg_low; + double exp_high, exp_low; + + if (!__finite (arg)) + return __ieee754_exp (arg); + if (arg < DBL_MIN_10_EXP - DBL_DIG - 10) + return DBL_MIN * DBL_MIN; + else if (arg > DBL_MAX_10_EXP + 1) + return DBL_MAX * DBL_MAX; + + GET_LOW_WORD (lx, arg); + lx &= 0xf8000000; + arg_high = arg; + SET_LOW_WORD (arg_high, lx); + arg_low = arg - arg_high; + exp_high = arg_high * log10_high; + exp_low = arg_high * log10_low + arg_low * M_LN10; + return __ieee754_exp (exp_high) * __ieee754_exp (exp_low); +} +strong_alias (__ieee754_exp10, __exp10_finite) |