For the mainstream OSes (Windows, OSX, Linux Android) You don't need to flush the instruction cache on most x86 CPUs after modifying the code segment dynamicall

For the mainstream OSes (Windows, OSX, Linux Android) You don't need to flush the instruction cache on most x86 CPUs after modifying the code segment dynamically, but you do on ARM and MIPS. This has burned me before while writing a binary packer for Android.