1  /* Round to int floating-point values.  RISC-V version.
       2     Copyright (C) 2017-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library.  If not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <math.h>
      20  #include <fenv_private.h>
      21  #include <libm-alias-float.h>
      22  #include <stdint.h>
      23  
      24  float
      25  __nearbyintf (float x)
      26  {
      27    int flags = riscv_getflags ();
      28    bool nan = isnan (x);
      29    float mag = fabsf (x);
      30  
      31    if (nan)
      32      return x + x;
      33  
      34    if (mag < (1 << __FLT_MANT_DIG__))
      35      {
      36        int32_t i;
      37        float new_x;
      38  
      39        asm volatile ("fcvt.w.s %0, %1" : "=r" (i) : "f" (x));
      40        asm volatile ("fcvt.s.w %0, %1" : "=f" (new_x) : "r" (i));
      41  
      42        /* nearbyint(-0) == -0, and in general we'll always have the same
      43  	 sign as our input.  */
      44        x = copysignf (new_x, x);
      45  
      46        riscv_setflags (flags);
      47      }
      48  
      49    return x;
      50  }
      51  
      52  libm_alias_float (__nearbyint, nearbyint)