[makomk]

Multi-byte nops have compatibility issues on some of the more obscure 32-bit x86 CPUs, unfortunately: https://sourceware.org/bugzilla/show_bug.cgi?id=13675

[pkhuong]

Right… you have to check cpuid for the long nop feature. I believe 0x66 0x90 is compatible (but slow, I would expect) with older CPUs.