[lkml]   [2009]   [Jan]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
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.



 \ /
  Last update: 2009-01-18 05:27    [W:0.148 / U:12.316 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site