diff options
Diffstat (limited to 'sysdeps/ieee754/soft-fp/s_fsubl.c')
| -rw-r--r-- | sysdeps/ieee754/soft-fp/s_fsubl.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/sysdeps/ieee754/soft-fp/s_fsubl.c b/sysdeps/ieee754/soft-fp/s_fsubl.c new file mode 100644 index 0000000000..84b1013797 --- /dev/null +++ b/sysdeps/ieee754/soft-fp/s_fsubl.c @@ -0,0 +1,55 @@ +/* Subtract long double (ldbl-128) values, narrowing the result to + float, using soft-fp. + Copyright (C) 2018 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/>. */ + +#define f32subf64x __hide_f32subf64x +#define f32subf128 __hide_f32subf128 +#include <math.h> +#undef f32subf64x +#undef f32subf128 + +#include <math-narrow.h> +#include <soft-fp.h> +#include <single.h> +#include <quad.h> + +float +__fsubl (_Float128 x, _Float128 y) +{ + FP_DECL_EX; + FP_DECL_Q (X); + FP_DECL_Q (Y); + FP_DECL_Q (R); + FP_DECL_S (RN); + float ret; + + FP_INIT_ROUNDMODE; + FP_UNPACK_SEMIRAW_Q (X, x); + FP_UNPACK_SEMIRAW_Q (Y, y); + FP_SUB_Q (R, X, Y); +#if (2 * _FP_W_TYPE_SIZE) < _FP_FRACBITS_Q + FP_TRUNC (S, Q, 1, 4, RN, R); +#else + FP_TRUNC (S, Q, 1, 2, RN, R); +#endif + FP_PACK_SEMIRAW_S (ret, RN); + FP_HANDLE_EXCEPTIONS; + CHECK_NARROW_SUB (ret, x, y); + return ret; +} +libm_alias_float_ldouble (sub) |