diff options
Diffstat (limited to 'sysdeps/x86/fpu/s_ffma.c')
| -rw-r--r-- | sysdeps/x86/fpu/s_ffma.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/sysdeps/x86/fpu/s_ffma.c b/sysdeps/x86/fpu/s_ffma.c new file mode 100644 index 0000000000..95c2dcd7b7 --- /dev/null +++ b/sysdeps/x86/fpu/s_ffma.c @@ -0,0 +1,46 @@ +/* Fused multiply-add of double value, narrowing the result to float. + x86 version. + Copyright (C) 2021 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/>. */ + +#define f32fmaf64 __hide_f32fmaf64 +#define f32fmaf32x __hide_f32fmaf32x +#define ffmal __hide_ffmal +#include <math.h> +#undef f32fmaf64 +#undef f32fmaf32x +#undef ffmal + +#include <math-narrow.h> + +#if defined __SSE2_MATH__ && !defined __FP_FAST_FMA +/* Depending on the details of the glibc configuration, fma might use + either SSE or 387 arithmetic; ensure that both parts of the + floating-point state are handled in the round-to-odd code. */ +# undef libc_feholdexcept_setround +# define libc_feholdexcept_setround default_libc_feholdexcept_setround +# undef libc_feupdateenv_test +# define libc_feupdateenv_test default_libc_feupdateenv_test +#endif + +float +__ffma (double x, double y, double z) +{ + NARROW_FMA_ROUND_TO_ODD (x, y, z, float, union ieee754_double, , mantissa1, + false); +} +libm_alias_float_double (fma) |