Another sibling comment here references it obliquely but on x86 the prefetch queue produces similar behaviour, until Intel decided to detect SMC on the Pentium

Another sibling comment here references it obliquely but on x86 the prefetch queue produces similar behaviour, until Intel decided to detect SMC on the Pentium and newer CPUs so that modifying the instruction about to be executed will always have an effect. However, someone much later found another undetected edge-case: a self-overwriting repeated string instruction. https://silviocesare.wordpress.com/2009/02/02/anti-debugging-prefetch-tricks-and-single-stepping-through-a-rep-stosmovs/ https://silviocesare.wordpress.com/2009/02/02/anti-debugging...