diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/s_rintl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/s_rintl.c | 119 |
1 files changed, 0 insertions, 119 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_rintl.c b/sysdeps/ieee754/ldbl-128ibm/s_rintl.c deleted file mode 100644 index 1f4e33f..0000000 --- a/sysdeps/ieee754/ldbl-128ibm/s_rintl.c +++ /dev/null @@ -1,119 +0,0 @@ -/* Round to int long double floating-point values. - IBM extended format long double version. - Copyright (C) 2006 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, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -/* This has been coded in assembler because GCC makes such a mess of it - when it's coded in C. */ - -#include <math.h> -#include <fenv_libc.h> -#include <math_ldbl_opt.h> -#include <float.h> -#include <ieee754.h> - - -#ifdef __STDC__ -long double -__rintl (long double x) -#else -long double -__rintl (x) - long double x; -#endif -{ - double xh, xl, hi, lo; - - ldbl_unpack (x, &xh, &xl); - - /* Return Inf, Nan, +/-0 unchanged. */ - if (__builtin_expect (xh != 0.0 - && __builtin_isless (__builtin_fabs (xh), - __builtin_inf ()), 1)) - { - double orig_xh; - int save_round = fegetround (); - - /* Long double arithmetic, including the canonicalisation below, - only works in round-to-nearest mode. */ - fesetround (FE_TONEAREST); - - /* Convert the high double to integer. */ - orig_xh = xh; - hi = ldbl_nearbyint (xh); - - /* Subtract integral high part from the value. If the low double - happens to be exactly 0.5 or -0.5, you might think that this - subtraction could result in an incorrect conversion. For - instance, subtracting an odd number would cause this function - to round in the wrong direction. However, if we have a - canonical long double with the low double 0.5 or -0.5, then the - high double must be even. */ - xh -= hi; - ldbl_canonicalize (&xh, &xl); - - /* Now convert the low double, adjusted for any remainder from the - high double. */ - lo = ldbl_nearbyint (xh); - - xh -= lo; - ldbl_canonicalize (&xh, &xl); - - switch (save_round) - { - case FE_TONEAREST: - if (xl > 0.0 && xh == 0.5) - lo += 1.0; - else if (xl < 0.0 && -xh == 0.5) - lo -= 1.0; - break; - - case FE_TOWARDZERO: - if (orig_xh < 0.0) - goto do_up; - /* Fall thru */ - - case FE_DOWNWARD: - if (xh < 0.0 || (xh == 0.0 && xl < 0.0)) - lo -= 1.0; - break; - - case FE_UPWARD: - do_up: - if (xh > 0.0 || (xh == 0.0 && xl > 0.0)) - lo += 1.0; - break; - } - - /* Ensure the final value is canonical. In certain cases, - rounding causes hi,lo calculated so far to be non-canonical. */ - xh = hi; - xl = lo; - ldbl_canonicalize (&xh, &xl); - - /* Ensure we return -0 rather than +0 when appropriate. */ - if (orig_xh < 0.0) - xh = -__builtin_fabs (xh); - - fesetround (save_round); - } - - return ldbl_pack (xh, xl); -} - -long_double_symbol (libm, __rintl, rintl); |