| 1 | /* Copyright (C) 2000-2022 Free Software Foundation, Inc. |
|---|
| 2 | This file is part of the GNU C Library. |
|---|
| 3 | |
|---|
| 4 | The GNU C Library is free software; you can redistribute it and/or |
|---|
| 5 | modify it under the terms of the GNU Lesser General Public |
|---|
| 6 | License as published by the Free Software Foundation; either |
|---|
| 7 | version 2.1 of the License, or (at your option) any later version. |
|---|
| 8 | |
|---|
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
|---|
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|---|
| 12 | Lesser General Public License for more details. |
|---|
| 13 | |
|---|
| 14 | You should have received a copy of the GNU Lesser General Public |
|---|
| 15 | License along with the GNU C Library. If not, see |
|---|
| 16 | <https://www.gnu.org/licenses/>. */ |
|---|
| 17 | |
|---|
| 18 | #define NO_MATH_REDIRECT |
|---|
| 19 | #include <math.h> |
|---|
| 20 | #include <math_ldbl_opt.h> |
|---|
| 21 | #include <libm-alias-double.h> |
|---|
| 22 | |
|---|
| 23 | |
|---|
| 24 | double |
|---|
| 25 | __rint (double x) |
|---|
| 26 | { |
|---|
| 27 | if (isnan (x)) |
|---|
| 28 | return x + x; |
|---|
| 29 | |
|---|
| 30 | if (isless (fabs (x), 9007199254740992.0)) /* 1 << DBL_MANT_DIG */ |
|---|
| 31 | { |
|---|
| 32 | double tmp1, new_x; |
|---|
| 33 | __asm ("cvttq/svid %2,%1\n\t" |
|---|
| 34 | "cvtqt/d %1,%0\n\t" |
|---|
| 35 | : "=f" (new_x), "=&f" (tmp1) |
|---|
| 36 | : "f" (x)); |
|---|
| 37 | |
|---|
| 38 | /* rint(-0.1) == -0, and in general we'll always have the same |
|---|
| 39 | sign as our input. */ |
|---|
| 40 | x = copysign(x: new_x, y: x); |
|---|
| 41 | } |
|---|
| 42 | return x; |
|---|
| 43 | } |
|---|
| 44 | |
|---|
| 45 | libm_alias_double (__rint, rint) |
|---|
| 46 | |
|---|
