1  /* Copyright (C) 2000-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library.  If not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #define NO_MATH_REDIRECT
      19  #include <math.h>
      20  #include <libm-alias-float.h>
      21  
      22  
      23  float
      24  __rintf (float x)
      25  {
      26    if (isnanf (x))
      27      return x + x;
      28  
      29    if (isless (fabsf (x), 16777216.0f))	/* 1 << FLT_MANT_DIG */
      30      {
      31        /* Note that Alpha S_Floating is stored in registers in a
      32  	 restricted T_Floating format, so we don't even need to
      33  	 convert back to S_Floating in the end.  The initial
      34  	 conversion to T_Floating is needed to handle denormals.  */
      35  
      36        float tmp1, tmp2, new_x;
      37  
      38        __asm ("cvtst/s %3,%2\n\t"
      39  	     "cvttq/svid %2,%1\n\t"
      40  	     "cvtqt/d %1,%0\n\t"
      41  	     : "=f"(new_x), "=&f"(tmp1), "=&f"(tmp2)
      42  	     : "f"(x));
      43  
      44        /* rint(-0.1) == -0, and in general we'll always have the same
      45  	 sign as our input.  */
      46        x = copysignf(new_x, x);
      47      }
      48    return x;
      49  }
      50  
      51  libm_alias_float (__rint, rint)