1 | /* llroundf() - S390 version. |
2 | Copyright (C) 2019-2024 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 | #if defined __s390x__ && defined HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT |
21 | /* We only support s390x as on s390 a long long int refers to a register pair |
22 | of two 4byte registers instead of a 8byte register which is produced by the |
23 | instruction. |
24 | Note: On s390 this instruction would only be used if build with -mzarch. */ |
25 | # include <math.h> |
26 | # include <libm-alias-float.h> |
27 | |
28 | long long int |
29 | __llroundf (float x) |
30 | { |
31 | long long int y; |
32 | /* The z196 zarch "convert to fixed" (cgebra) instruction is rounding |
33 | x to the nearest integer with "ties away from 0" rounding mode |
34 | (M3-field: 1) where inexact exceptions are suppressed (M4-field: 4). */ |
35 | __asm__ ("cgebra %0,1,%1,4" : "=d" (y) : "f" (x) : "cc" ); |
36 | return y; |
37 | } |
38 | libm_alias_float (__llround, llround) |
39 | |
40 | #else |
41 | # include <sysdeps/ieee754/flt-32/s_llroundf.c> |
42 | #endif |
43 | |