iy2
int iy0, iy1, iy2, iy3, iy4;
iy2 = ival2 & 0x007fffff;
ival2 = (iy2 + 0x20000) & 0xfffc0000;
iy2 = iy2 - ival2;
yy2 = (double) iy2 * __TBL_logf[i2 + 1];