48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
/* lroundf() - S390 version.
|
|
Copyright (C) 2019-2022 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public License as
|
|
published by the Free Software Foundation; either version 2.1 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
|
|
# include <math.h>
|
|
# include <libm-alias-float.h>
|
|
|
|
/* The sizeof (long int) differs between s390x (8byte) and s390 (4byte).
|
|
Thus we need different instructions as the target size is encoded there.
|
|
Note: On s390 this instruction is only used if build with -mzarch. */
|
|
# ifdef __s390x__
|
|
# define INSN "cgebra"
|
|
# else
|
|
# define INSN "cfebra"
|
|
# endif
|
|
|
|
long int
|
|
__lroundf (float x)
|
|
{
|
|
long int y;
|
|
/* The z196 zarch "convert to fixed" (cgebra) instruction is rounding
|
|
x to the nearest integer with "ties away from 0" rounding mode
|
|
(M3-field: 1) where inexact exceptions are suppressed (M4-field: 4). */
|
|
__asm__ (INSN " %0,1,%1,4" : "=d" (y) : "f" (x) : "cc");
|
|
return y;
|
|
}
|
|
libm_alias_float (__lround, lround)
|
|
|
|
#else
|
|
# include <sysdeps/ieee754/flt-32/s_lroundf.c>
|
|
#endif
|