/* roundf().  RISC-V version.

   Copyright (C) 2017-2018 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>

#include <math_private.h>

#include <libm-alias-float.h>

#include <stdint.h>

float

__roundf (float x)

{

  int flags = riscv_getflags ();

  bool nan = isnan (x);

  float mag = fabsf (x);

  if (nan)

    return x + x;

  if (mag < (1 << __FLT_MANT_DIG__))

    {

      int32_t i;

      float new_x;

      asm volatile ("fcvt.w.s %0, %1, rmm" : "=r" (i) : "f" (x));

      asm volatile ("fcvt.s.w %0, %1, rmm" : "=f" (new_x) : "r" (i));

      /* round(-0) == -0, and in general we'll always have the same

	 sign as our input.  */

      x = copysignf (new_x, x);

      riscv_setflags (flags);

    }

  return x;

}

libm_alias_float (__round, round)