Multi-byte nops have compatibility issues on some of the more obscure 32-bit x86... | Hacker News

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makomk on Dec 2, 2014 | parent | context | favorite | on: Memcpy vs. memmove

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 on Dec 2, 2014 [–]

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.

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