Apple’s market cap is $983B and IBM’s is $125B. So somehow they’ve survived this lowbrow hack.

Seriously, with 64 bit addresses available on the iPhone I’m typing this into, this is an excellent trick, especially for applications. Even ARM’s TBI leaves 56 bits which is more address space than a data center’s DRAM.

  log2(16 billion * 100,000) is about 50 

You have a point at 32. You’re just wrong at 64.