The number of map elements is called its length.
For a map <code>m</code>, it can be discovered using the
built-in function <a href="#Length_and_capacity"><code>len</code></a>
and may change during execution. Elements may be added during execution
using <a href="#Assignments">assignments</a> and retrieved with
<a href="#Index_expressions">index expressions</a>; they may be removed with the

TEXT asmtest_avx512bw(SB), NOSPLIT, $0
	KADDD K4, K7, K5                                   // c4e1c54aec
	KADDD K6, K7, K5                                   // c4e1c54aee
	KADDD K4, K6, K5                                   // c4e1cd4aec
	KADDD K6, K6, K5                                   // c4e1cd4aee
	KADDD K4, K7, K4                                   // c4e1c54ae4
	KADDD K6, K7, K4                                   // c4e1c54ae6