1 /* llroundf() - 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 #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
__llroundf(float x)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