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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/s390/fpu/s_llrintf.c
1 /* llrintf() - S390 version.
2 Copyright (C) 2019-2021 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
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.
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.
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/>. */
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
24 Note: On s390 this instruction would only be used if build with -mzarch. */
26 # include <libm-alias-float.h>
32 /* The z196 zarch "convert to fixed" (cgebra) instruction is rounding
33 according to current rounding mode (M3-field: 0).
34 First convert x with suppressed inexact exception and check if the
35 resulting value is beyond the target limits (indicated by cc=3;
36 Note: a nan is also indicated by cc=3).
37 If the resulting value is within the target limits, redo
38 without suppressing the inexact exception. */
39 __asm__ ("cgebra %0,0,%1,4 \n\t"
41 "cgebra %0,0,%1,0 \n\t"
43 : "=&d" (y
) : "f" (x
) : "cc");
46 libm_alias_float (__llrint
, llrint
)
49 # include <sysdeps/ieee754/flt-32/s_llrintf.c>