mingw-w64-crt/misc/fegetround.c

/**
 * This file has no copyright assigned and is placed in the Public Domain.
 * This file is part of the w64 mingw-runtime package.
 * No warranty is given; refer to the file DISCLAIMER within this package.
 */
#include <fenv.h>

/* 7.6.3.1
   The fegetround function returns the value of the rounding direction
   macro representing the current rounding direction.  */

int
fegetround (void)
{
  unsigned short _cw;
  __asm__ ("fnstcw %0;"	: "=m" (_cw));
  return _cw
          & (FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO);
}