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  1. #include <fenv.h>
  2. #include <math.h>
  3. #include <errno.h>
  4. #define FE_ROUNDING_MASK \
  5.   (FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO)
  6.  
  7. float
  8. modff (float value, float* iptr)
  9. {
  10.   float int_part;
  11.   unsigned short saved_cw;
  12.   unsigned short tmp_cw;
  13.   /* truncate */
  14.   asm ("fnstcw %0;" : "=m" (saved_cw)); /* save control word */
  15.   tmp_cw = (saved_cw & ~FE_ROUNDING_MASK) | FE_TOWARDZERO;
  16.   asm ("fldcw %0;" : : "m" (tmp_cw));
  17.   asm ("frndint;" : "=t" (int_part) : "0" (value)); /* round */
  18.   asm ("fldcw %0;" : : "m" (saved_cw)); /* restore saved cw */
  19.   if (iptr)
  20.     *iptr = int_part;
  21.   return (isinf (value) ?  0.0F : value - int_part);
  22. }
  23.