glibc/sysdeps/aarch64/fpu/s_lrint.c

/* Copyright (C) 1996-2017 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
   <http://www.gnu.org/licenses/>.  */

#include <math.h>

#ifndef FUNC
# define FUNC lrint
#endif

#ifndef ITYPE
# define ITYPE double
# define IREGS "d"
#else
# ifndef IREGS
#  error IREGS not defined
# endif
#endif

#ifndef OTYPE
# define OTYPE long int
#endif

#define OREGS "x"

#define __CONCATX(a,b) __CONCAT(a,b)

OTYPE
__CONCATX(__,FUNC) (ITYPE x)
{
  OTYPE result;
  ITYPE temp;
  asm ( "frintx" "\t%" IREGS "1, %" IREGS "2\n\t"
        "fcvtzs" "\t%" OREGS "0, %" IREGS "1"
        : "=r" (result), "=w" (temp) : "w" (x) );
  return result;
}

weak_alias (__CONCATX(__,FUNC), FUNC)