A lot of assemblers did that. Which is why in self-modifying code you inserted an instruction to load a large integer constant (e.g. 0xDEADBEEF) that the assemb

A lot of assemblers did that. Which is why in self-modifying code you inserted an instruction to load a large integer constant (e.g. 0xDEADBEEF) that the assembler could not optimize into a smaller instruction. Then at runtime you would replace that integer constant with whatever value, without the risk of overwriting part of the next instruction. Those were the days...