mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/* lrint() - S390 version.
|
|
Copyright (C) 2019-2023 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-double.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 "cgdbra"
|
|
# else
|
|
# define INSN "cfdbra"
|
|
# endif
|
|
|
|
long int
|
|
__lrint (double x)
|
|
{
|
|
long int y;
|
|
/* The z196 zarch "convert to fixed" (cgdbra) instruction is rounding
|
|
according to current rounding mode (M3-field: 0).
|
|
First convert x with suppressed inexact exception and check if the
|
|
resulting value is beyond the target limits (indicated by cc=3;
|
|
Note: a nan is also indicated by cc=3).
|
|
If the resulting value is within the target limits, redo
|
|
without suppressing the inexact exception. */
|
|
__asm__ (INSN " %0,0,%1,4 \n\t"
|
|
"jo 1f \n\t"
|
|
INSN " %0,0,%1,0 \n\t"
|
|
"1:"
|
|
: "=&d" (y) : "f" (x) : "cc");
|
|
return y;
|
|
}
|
|
libm_alias_double (__lrint, lrint)
|
|
|
|
#else
|
|
# include <sysdeps/ieee754/dbl-64/s_lrint.c>
|
|
#endif
|