sysdeps/s390/fpu/s_roundevenl.c

   1 /* roundevenl() - S390 version.
   2    Copyright (C) 2019 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 #ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
  21 # include <math.h>
  22 # include <math_private.h>
  23 # include <libm-alias-ldouble.h>
  24
  25 _Float128
  26 __roundevenl (_Float128 x)
  27 {
  28   _Float128 y;
  29   /* The z196 zarch "load fp integer" (fixbra) instruction is rounding
  30      x to the nearest integer with "ties to even" rounding mode
  31      (M3-field: 4) where inexact exceptions are suppressed (M4-field: 4).  */
  32   __asm__ ("fixbra %0,4,%1,4" : "=f" (y) : "f" (x));
  33   return y;
  34 }
  35 libm_alias_ldouble (__roundeven, roundeven)
  36
  37 #else
  38 # include <sysdeps/ieee754/ldbl-128/s_roundevenl.c>
  39 #endif