mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-10 07:10:06 +00:00
7d42d614fd
If compiled with z196 zarch support, the convert-to-fixed instruction is used to implement llround, llroundf, llroundl. Otherwise the common-code implementation is used.
43 lines
1.6 KiB
C
43 lines
1.6 KiB
C
/* llround() - S390 version.
|
|
Copyright (C) 2019 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/>. */
|
|
|
|
#if defined __s390x__ && defined HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
|
|
/* We only support s390x as on s390 a long long int refers to a register pair
|
|
of two 4byte registers instead of a 8byte register which is produced by the
|
|
instruction.
|
|
Note: On s390 this instruction would only be used if build with -mzarch. */
|
|
# include <math.h>
|
|
# include <libm-alias-double.h>
|
|
|
|
long long int
|
|
__llround (double x)
|
|
{
|
|
long long int y;
|
|
/* The z196 zarch "convert to fixed" (cgdbra) 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__ ("cgdbra %0,1,%1,4" : "=d" (y) : "f" (x) : "cc");
|
|
return y;
|
|
}
|
|
libm_alias_double (__llround, llround)
|
|
|
|
#else
|
|
# include <sysdeps/ieee754/dbl-64/s_llround.c>
|
|
#endif
|