It should do!

The basic semantics for choosing the NOP sequence were completely wrong. This 
has been fixed now.
The NOPL instruction is not supported by all i686 processors, the coded 
assumption was that they did. This has been changed by the recent AMD patches 
so that it is not assumed and it's specified as an extension where it is 
supported.

Examples of such processors that would otherwise run i686 code are the
AMD Geode LX, Via C3, Via Eden and Transmeta Crusoe.

The benefit of full i686 optimisation, which do have real performance
implications, are things like bswap (useful in networking), cmpxchg/xadd
(used in atomics) and cmov (useful in compiler generated code).

-- 
libc6 upgrade fails: illegal instruction
https://bugs.launchpad.net/bugs/587186
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