1 /* llroundl() - 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 <math_private.h>
27 # include <libm-alias-ldouble.h>
28
29 long long int
__llroundl(_Float128 x)30 __llroundl (_Float128 x)
31 {
32 long long int y;
33 /* The z196 zarch "convert to fixed" (cgxbra) instruction is rounding
34 x to the nearest integer with "ties away from 0" rounding mode
35 (M3-field: 1) where inexact exceptions are suppressed (M4-field: 4). */
36 __asm__ ("cgxbra %0,1,%1,4" : "=d" (y) : "f" (x) : "cc");
37 return y;
38 }
39 libm_alias_ldouble (__llround, llround)
40
41 #else
42 # include <sysdeps/ieee754/ldbl-128/s_llroundl.c>
43 #endif
44