FYI similarly, fs: is special on NT/x86 & gs: is special on NT/amd64.
In both cases they point to "mostly private builtin" thread locals and from there "publically extensible" thread locals -- TlsGetValue & __declspec(thread) are accessed, & x86 exception handling frame chain, which is just another builtin thread local. (fs: retains the same meaning for NT/x86-on-ia64-or-amd64 as on native NT/x86.) - Jay On Jul 3, 2015, at 1:29 AM, Richard Biener <richard.guent...@gmail.com> wrote: > On Thu, Jul 2, 2015 at 5:57 PM, Armin Rigo <ar...@tunes.org> wrote: >> Hi all, >> >> I implemented support for %fs and %gs segment prefixes on the x86 and >> x86-64 platforms, in what turns out to be a small patch. >> >> For those not familiar with it, at least on x86-64, %fs and %gs are >> two special registers that a user program can ask be added to any >> address machine ...
