text: /* Set current rounding direction.
     Copyright (C) 1997, 2003, 2004, 2005 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
     Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
  
     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 <fenv.h>
  #include <unistd.h>
  
  int
  fesetround (int round)
  {
    unsigned short int cw;
  
    if ((round & ~0xc00) != 0)
      /* ROUND is no valid rounding mode.  */
      return 1;
  
    __asm__ ("fnstcw %0" : "=m" (*&cw));
    cw &= ~0xc00;
    cw |= round;
    __asm__ ("fldcw %0" : : "m" (*&cw));
  
  #if 0
    /* If the CPU supports SSE we set the MXCSR as well.  */
    if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
      {
        unsigned int xcw;
  
        __asm__ ("stmxcsr %0" : "=m" (*&xcw));
        xcw &= ~0x6000;
        xcw |= round << 3;
        __asm__ ("ldmxcsr %0" : : "m" (*&xcw));
      }
  #endif
  
    return 0;
  }
  