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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/100354] [9/10/11/12 regression] aarch64:
 non-deligitimized UNSPEC UNSPEC_TLS (76) found in variable location
Date: Tue, 08 Feb 2022 18:27:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100354

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
In this particular case it is:
(note 38 19 20 (var_location p (unspec:DI [
        (const_int 0 [0])
    ] UNSPEC_TLS)) NOTE_INSN_VAR_LOCATION)
where p's value should be equal to that __builtin_thread_pointer () aka the
base of the TLS region.

I wonder if it could be represented as DW_OP_lit0 DW_OP_form_tls_address,
one would need to test that in debugger.
And if it works, figure out some target independent way or perhaps a target
hook that would propagate this case from the target dependent UNSPEC_TLS to
dwarf2out.cc that it could emit such location.=