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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.

Thanks.

--
tejun


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