45   int i0, i1, j0;  in floor()  local
50   j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;  in floor()
51   if (j0 < 20)  in floor()
53     if (j0 < 0) /* raise inexact if x != 0 */  in floor()
70       i = (0x000fffff) >> j0;  in floor()
79           i0 += (0x00100000) >> j0;  in floor()
86   else if (j0 > 51)  in floor()
88     if (j0 == 0x400) /* inf or NaN */  in floor()
99     i = ((unsigned) (0xffffffff)) >> (j0 - 20);  in floor()
108         if (j0 == 20)  in floor()
114           j = i1 + (1 << (52 - j0));  in floor()