| /* nearbyint(). RISC-V version. |
| Copyright (C) 2017-2018 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <math.h> |
| #include <math_private.h> |
| #include <libm-alias-double.h> |
| #include <stdint.h> |
| |
| double |
| __nearbyint (double x) |
| { |
| int flags = riscv_getflags (); |
| bool nan = isnan (x); |
| double mag = fabs (x); |
| |
| if (nan) |
| return x + x; |
| |
| if (mag < (1ULL << __DBL_MANT_DIG__)) |
| { |
| int64_t i; |
| double new_x; |
| |
| asm volatile ("fcvt.l.d %0, %1" : "=r" (i) : "f" (x)); |
| asm volatile ("fcvt.d.l %0, %1" : "=f" (new_x) : "r" (i)); |
| |
| /* nearbyint(-0) == -0, and in general we'll always have the same |
| sign as our input. */ |
| x = copysign (new_x, x); |
| |
| riscv_setflags (flags); |
| } |
| |
| return x; |
| } |
| |
| libm_alias_double (__nearbyint, nearbyint) |
