| /* Copyright (C) 2007-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Richard Henderson. |
| |
| 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 <math_ldbl_opt.h> |
| |
| |
| /* Use the chopped rounding mode conversion instructions to implement trunc. */ |
| |
| double |
| __trunc (double x) |
| { |
| double two52 = copysign (0x1.0p52, x); |
| double r, tmp; |
| |
| __asm ( |
| #ifdef _IEEE_FP_INEXACT |
| "addt/suic %2, %3, %1\n\tsubt/suic %1, %3, %0" |
| #else |
| "addt/suc %2, %3, %1\n\tsubt/suc %1, %3, %0" |
| #endif |
| : "=&f"(r), "=&f"(tmp) |
| : "f"(x), "f"(two52)); |
| |
| /* trunc(-0) == -0, and in general we'll always have the same |
| sign as our input. */ |
| return copysign (r, x); |
| } |
| |
| weak_alias (__trunc, trunc) |
| #ifdef NO_LONG_DOUBLE |
| strong_alias (__trunc, __truncl) |
| weak_alias (__trunc, truncl) |
| #endif |
| #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) |
| compat_symbol (libm, __trunc, truncl, GLIBC_2_1); |
| #endif |
