Messages in this thread | | | Date | Sun, 18 Jan 2009 13:22:09 +0900 | From | Tejun Heo <> | Subject | Re: [PATCH 12/17] x86-64: Use absolute displacements for per-cpu accesses. |
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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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