71     int ix, iy, ygx, idx;  in cvFastArctan()  local
81     ygx = (iy <= ix) - 1;  in cvFastArctan()
82     idx -= ygx;  in cvFastArctan()
87     ix ^= iy & ygx;  in cvFastArctan()
88     iy ^= ix & ygx;  in cvFastArctan()
89     ix ^= iy & ygx;  in cvFastArctan()
121             int ygx, k = (ix < 0) * 2 + (iy < 0) * 4;  variable
127             ygx = (iy <= ix) - 1;
128             k -= ygx;
133             ix ^= iy & ygx;
134             iy ^= ix & ygx;
135             ix ^= iy & ygx;