Re: [PATCH 02/11] riscv: xtheadmempair: Fix CFA reg notes

[Kito Cheng <kito.cheng@gmail.com>]

ok

On Fri, Apr 28, 2023 at 2:15 PM Christoph Muellner
<christoph.muellner@vrull.eu> wrote:
>
> From: Christoph Müllner <christoph.muellner@vrull.eu>
>
> The current implementation triggers an assertion in
> dwarf2out_frame_debug_cfa_offset() under certain circumstances.
> The standard code uses REG_FRAME_RELATED_EXPR notes instead
> of REG_CFA_OFFSET notes when saving registers on the stack.
> So let's do this as well.
>
> gcc/ChangeLog:
>
>         * config/riscv/thead.cc (th_mempair_save_regs):
>         Emit REG_FRAME_RELATED_EXPR notes in prologue.
>
> Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>
> ---
>  gcc/config/riscv/thead.cc | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/gcc/config/riscv/thead.cc b/gcc/config/riscv/thead.cc
> index 75203805310..d7e3cf80d9b 100644
> --- a/gcc/config/riscv/thead.cc
> +++ b/gcc/config/riscv/thead.cc
> @@ -368,8 +368,12 @@ th_mempair_save_regs (rtx operands[4])
>    rtx set2 = gen_rtx_SET (operands[2], operands[3]);
>    rtx insn = emit_insn (gen_rtx_PARALLEL (VOIDmode, gen_rtvec (2, set1, set2)));
>    RTX_FRAME_RELATED_P (insn) = 1;
> -  add_reg_note (insn, REG_CFA_OFFSET, copy_rtx (set1));
> -  add_reg_note (insn, REG_CFA_OFFSET, copy_rtx (set2));
> +
> +  REG_NOTES (insn) = alloc_EXPR_LIST (REG_FRAME_RELATED_EXPR,
> +                                     copy_rtx (set1), REG_NOTES (insn));
> +
> +  REG_NOTES (insn) = alloc_EXPR_LIST (REG_FRAME_RELATED_EXPR,
> +                                     copy_rtx (set2), REG_NOTES (insn));
>  }
>
>  /* Similar like riscv_restore_reg, but restores two registers from memory
> --
> 2.40.1
>