https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89502

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to H.J. Lu from comment #1)
> 
> Ever better, we can use UNSPEC_TP to handle it:
> 
>       movl    %fs:24, %ecx
> 

This is how TCB is accessed in glibc.

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