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Post #791 796

Forwarded from Vivian's dev rants.

Why xor reg, reg is the best way to zero a register:

https://stackoverflow.com/questions/33666617/what-is-the-best-way-to-set-a-register-to-zero-in-x86-assembly-xor-mov-or-and/33668295#33668295
Stack Overflow What is the best way to set a register to zero in x86 assembly: xor, mov or and? All the following instructions do the same thing: set %eax to zero. Which way is optimal (requiring fewest machine cycles)? xorl %eax, %eax mov $0, %eax andl $0, %eax
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