diff options
Diffstat (limited to 'math/s_exp10m1_template.c')
-rw-r--r-- | math/s_exp10m1_template.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/math/s_exp10m1_template.c b/math/s_exp10m1_template.c new file mode 100644 index 0000000000..ea3ef54e82 --- /dev/null +++ b/math/s_exp10m1_template.c @@ -0,0 +1,45 @@ +/* Return exp10(X) - 1. + Copyright (C) 2024 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 <errno.h> +#include <math.h> +#include <math_private.h> +#include <math-underflow.h> + +FLOAT +M_DECL_FUNC (__exp10m1) (FLOAT x) +{ + if (isgreaterequal (x, M_LIT (-0.5)) && islessequal (x, M_LIT (0.5))) + { + FLOAT ret = M_SUF (__expm1) (M_MLIT (M_LN10) * x); + math_check_force_underflow (ret); + return ret; + } + else if (isgreater (x, M_MANT_DIG / 3 + M_LIT (2.0))) + { + FLOAT ret = M_SUF (__ieee754_exp10) (x); + if (!isfinite (ret) && isfinite (x)) + __set_errno (ERANGE); + return ret; + } + else if (isless (x, -(M_MANT_DIG / 3) - M_LIT (2.0))) + return M_LIT (-1.0); + else + return M_SUF (__ieee754_exp10) (x) - M_LIT (1.0); +} +declare_mgen_alias (__exp10m1, exp10m1); |