libgcc/floatunsisf.c

   1 /* Public domain.  */
   2 typedef int SItype __attribute__ ((mode (SI)));
   3 typedef unsigned int USItype __attribute__ ((mode (SI)));
   4 typedef float SFtype __attribute__ ((mode (SF)));
   5
   6 SFtype
   7 __floatunsisf (USItype u)
   8 {
   9   SItype s = (SItype) u;
  10   if (s < 0)
  11     {
  12       /* As in expand_float, compute (u & 1) | (u >> 1) to ensure
  13          correct rounding if a nonzero bit is shifted out.  */
  14       return (SFtype) 2.0 * (SFtype) (SItype) ((u & 1) | (u >> 1));
  15     }
  16   else
  17     return (SFtype) s;
  18 }