[Bug target/102926] TLS register value is spilled to the stack instead of reloaded from the system register

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102926

rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-10-25
                 CC|                            |rsandifo at gcc dot gnu.org

--- Comment #6 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
I guess the first step would be to wrap the rhs of:

(define_insn "load_tp_hard"
  [(set (match_operand:SI 0 "register_operand" "=r")
        (unspec:SI [(const_int 0)] UNSPEC_TLS))]
  "TARGET_HARD_TP"
  "mrc%?\\tp15, 0, %0, c13, c0, 3\\t@ load_tp_hard"
  [(set_attr "predicable" "yes")
   (set_attr "type" "mrs")]
)

in (const …), so that it can be rematerialised.