lecture notes on reading floats

Elements in format string read into where registers point, not into the registers themselves.
Set up rsi, rdx, rcx, r8 to point to four locations in the stack (which has had memory "pushed" to reserve it). 
call scanf to put floats into where these registers POINT, which happens to be on the stack.
move an AVX register's worth of data from stack into AVX ymm10 register