The stack mixes data and program flow. The later via return addresses. If you want to go all-in with the stack I'd say it's important to maintain 2, one for ret

The stack mixes data and program flow. The later via return addresses. If you want to go all-in with the stack I'd say it's important to maintain 2, one for returns. Modern processors handle returns with special (caches?) hardware, which both eliminates the problem and demonstrates it.