https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100354
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ktkachov at gcc dot gnu.org,
| |rearnsha at gcc dot gnu.org,
| |rsandifo at gcc dot gnu.org
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It could be e.g. done by having the targetm.const_not_ok_for_debug_p target
hook not return true for the UNSPEC_TLS case and have some new target hook that
would handle emitting debug info for an UNSPEC.
Or a way to just quiet the note (I'll repeat it is -fchecking only) would be to
use as the operand of UNSPEC_TLS not const0_rtx as it does, but some magic
SYMBOL_REF with SYMBOL_REF_TLS_MODEL non-zero on it. Say like:
--- gcc/config/aarch64/aarch64.md.jj 2022-01-11 23:11:21.682300103 +0100
+++ gcc/config/aarch64/aarch64.md 2022-02-08 19:51:00.581676457 +0100
@@ -6833,7 +6833,8 @@ (define_insn "ldr_got_tiny_sidi"
(define_insn "aarch64_load_tp_hard"
[(set (match_operand:DI 0 "register_operand" "=r")
- (unspec:DI [(const_int 0)] UNSPEC_TLS))]
+ (unspec:DI [(match_operand 1 "aarch64_tls_le_symref" "S")]
+ UNSPEC_TLS))]
""
"mrs\\t%0, tpidr_el0"
[(set_attr "type" "mrs")]
--- gcc/config/aarch64/aarch64.cc.jj 2022-02-04 14:36:54.262615676 +0100
+++ gcc/config/aarch64/aarch64.cc 2022-02-08 19:46:58.206051731 +0100
@@ -18474,7 +18474,9 @@ aarch64_load_tp (rtx target)
target = gen_reg_rtx (Pmode);
/* Can return in any reg. */
- emit_insn (gen_aarch64_load_tp_hard (target));
+ rtx sym = gen_rtx_SYMBOL_REF (Pmode, "");
+ SYMBOL_REF_FLAGS (sym) = TLS_MODEL_LOCAL_EXEC << SYMBOL_FLAG_TLS_SHIFT;
+ emit_insn (gen_aarch64_load_tp_hard (target, sym));
return target;
}
