On Fri, Aug 08, 2008 at 05:53:26PM -0700, Roland McGrath wrote: > Are we sure there aren't some good available 5-byte nops? > > e.g. for 64-bit maybe 3e 48 8d 76 00 > for 32-bit maybe 3e 8d 74 26 00 > > Have the chip folks confirmed that exactly the set we have in > asm-x86/nops.h are the only optimal ones?
They were based on the respective optimization manuals, so yes.