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    SubjectRe: [PATCH 12/17] x86-64: Use absolute displacements for per-cpu accesses.
    Hello, Brian.

    Brian Gerst wrote:
    > Accessing memory through %gs should not use rip-relative addressing.
    > Adding a P prefix for the argument tells gcc to not add (%rip) to
    > the memory references.

    Nice catch. I dind't know about the P prefix thing. It also is used
    in other places too. Hmmm... I can't find anything about the P
    argument prefix in the gcc info page (4.3). Any ideas where I can
    find some information about it? It's a bit weird that it's not a
    constraint prefix but an argument one.



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