Ignored vs Assumed Semantics in BDE

foo(int*) - Assumed

000000000046ebf0 <foo(int*)>:
M0000000000000000:	retq		;  1 bytes
M0000000000000001:	nopw	%cs:(%rax,%rax)	; 10 bytes
M000000000000000b:	nopl	(%rax,%rax)	;  5 bytes