1 /* roundeven() - S390 version.
2 Copyright (C) 2019-2021 Free Software Foundation, Inc.
3
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20 #ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
21 # define NO_MATH_REDIRECT
22 # include <math.h>
23 # include <libm-alias-double.h>
24
25 double
__roundeven(double x)26 __roundeven (double x)
27 {
28 double y;
29 /* The z196 zarch "load fp integer" (fidbra) instruction is rounding
30 x to the nearest integer with "ties to even" rounding mode
31 (M3-field: 4) where inexact exceptions are suppressed (M4-field: 4). */
32 __asm__ ("fidbra %0,4,%1,4" : "=f" (y) : "f" (x));
33 return y;
34 }
35 libm_alias_double (__roundeven, roundeven)
36
37 #else
38 # include <sysdeps/ieee754/dbl-64/s_roundeven.c>
39 #endif
40