Hi

> Using TLS will slow down things noticeably though. So if we were to go
> there, we'd have to make up for some constant slowdown.
I can not understand why?

I've read
https://msdn.microsoft.com/en-us/library/windows/desktop/ms686749(v=vs.85).aspx
and
http://david-grs.github.io/tls_performance_overhead_cost_linux/
"""
The results are quite straightforward: no overhead at all.
"""

 0x0000000000404f40 <+0>:     inc    DWORD PTR [rip+0x202382]
 vs
 0x0000000000404f50 <+0>:     inc    DWORD PTR fs:0xfffffffffffffffc

It's clear.



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