GCC has done this for 20 years... the point is this optimisation requires a wider integer type than 64bits (in this case, apparently, 67 bits). This optimisatio

GCC has done this for 20 years... the point is this optimisation requires a wider integer type than 64bits (in this case, apparently, 67 bits). This optimisation is potentially important for anything generating bytecode, or native code inside a JIT.