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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/103938] ICE with __builtin_prefetch and vectors
Date: Fri, 07 Jan 2022 10:51:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103938

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
ira-costs.c record_operand_costs is stripping off the SUBREG. Is that even
valid thing to do?


  for (i =3D 0; i < recog_data.n_operands; i++)
    {
      rtx op_mem =3D extract_mem_from_operand (recog_data.operand[i]);
      memcpy (op_costs[i], init_cost, struct_costs_size);

      if (GET_CODE (recog_data.operand[i]) =3D=3D SUBREG)
        recog_data.operand[i] =3D SUBREG_REG (recog_data.operand[i]);



Here is the instruction which is causing the ICE and is valid with the subr=
eg
there:
(insn 7 6 0 2 (prefetch (subreg:DI (reg:V2DI 96) 0)
        (const_int 0 [0])
        (const_int 3 [0x3])) "t.c":4:3 26 {prefetch}
     (expr_list:REG_DEAD (reg:V2DI 96)
        (nil)))

I have to wonder if the stripping off the subreg is valid or not.=