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From: "acoplan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111677] [12/13/14 Regression] darktable build on aarch64
 fails with unrecognizable insn due to -fstack-protector changes
Date: Wed, 25 Oct 2023 11:19:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111677

Alex Coplan <acoplan at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rsandifo at gcc dot gnu.org

--- Comment #13 from Alex Coplan <acoplan at gcc dot gnu.org> ---
The problem seems to be this code in aarch64_process_components:

  while (regno !=3D last_regno)
    {
      bool frame_related_p =3D aarch64_emit_cfi_for_reg_p (regno);
      machine_mode mode =3D aarch64_reg_save_mode (regno);

      rtx reg =3D gen_rtx_REG (mode, regno);
      poly_int64 offset =3D frame.reg_offset[regno];
      if (frame_pointer_needed)
        offset -=3D frame.bytes_below_hard_fp;

      rtx addr =3D plus_constant (Pmode, ptr_reg, offset);
      rtx mem =3D gen_frame_mem (mode, addr);

which emits a TFmode mem with offset 512, which is out of range for TFmode =
(so
we later ICE with an unrecognisable insn).  Presumably this just needs twea=
king
to emit a new base anchor in the case of large offsets like this.  It looks
like the code in aarch64_save_callee_saves already does this.=