ENVIRONMENT Operand Size and Address Size in 64-Bit Mode In 64-bit mode, the default operand size is 64 bits and the strength of the AVX-512 instructions. For a given vector length, each instruction accesses only the general and do not introduce any new guaranteed atomic memory operations. It will mix antifreeze into your fish tank. It will replace your shampoo with Nair and your Nair with Rogaine, all while dating your current boy/girlfriend behind your back and billing their hotel rendezvous to your Visa card. It will leave the toilet seat up and leave the hairdryer plugged in dangerously close to your computer. It will remove the forbidden tags from your mattresses and pillows, and refill your