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    SubjectRe: Intel vs AMD64


    Nakajima, Jun wrote:
    > Thanks for the clarification.
    >
    > Yes, "implementation specific" is one of the differences between IA-32e
    > and AMD64, i.e. that behavior is architecturally defined on AMD64, but
    > on IA-32e (as I posted):
    > Near branch with 66H prefix:
    > As documented in PRM the behavior is implementation specific and
    > should
    > avoid using 66H prefix on near branches.


    In other words, Intel's implementation deviates from the architecture as
    defined by AMD. So it's not 100% compatible. I just want this point to
    be clear.


    If these sorts of branches are common enough (and I suspect they are),
    then this sort of deviation could have a notable code-size (and L1)
    impact on code which is compiled to be compatible with both implementations.

    Why did Intel decide to do that?

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