diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128/s_fma.c')
-rw-r--r-- | sysdeps/ieee754/ldbl-128/s_fma.c | 55 |
1 files changed, 0 insertions, 55 deletions
diff --git a/sysdeps/ieee754/ldbl-128/s_fma.c b/sysdeps/ieee754/ldbl-128/s_fma.c deleted file mode 100644 index 13da2904f4..0000000000 --- a/sysdeps/ieee754/ldbl-128/s_fma.c +++ /dev/null @@ -1,55 +0,0 @@ -/* Compute x * y + z as ternary operation. - Copyright (C) 2010-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Jakub Jelinek <jakub@redhat.com>, 2010. - - 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 <fenv.h> -#include <ieee754.h> - -/* This implementation relies on long double being more than twice as - precise as double and uses rounding to odd in order to avoid problems - with double rounding. - See a paper by Boldo and Melquiond: - http://www.lri.fr/~melquion/doc/08-tc.pdf */ - -double -__fma (double x, double y, double z) -{ - fenv_t env; - /* Multiplication is always exact. */ - long double temp = (long double) x * (long double) y; - - /* Ensure correct sign of an exact zero result by performing the - addition in the original rounding mode in that case. */ - if (temp == -z) - return (double) temp + z; - - union ieee854_long_double u; - feholdexcept (&env); - fesetround (FE_TOWARDZERO); - /* Perform addition with round to odd. */ - u.d = temp + (long double) z; - if ((u.ieee.mantissa3 & 1) == 0 && u.ieee.exponent != 0x7fff) - u.ieee.mantissa3 |= fetestexcept (FE_INEXACT) != 0; - feupdateenv (&env); - /* And finally truncation with round to nearest. */ - return (double) u.d; -} -#ifndef __fma -weak_alias (__fma, fma) -#endif |