[gcc r13-8462] riscv: xtheadmempair: Fix CFA reg notes

[gcc r13-8462] riscv: xtheadmempair: Fix CFA reg notes

[Christoph Mﾃｼllner]

https://gcc.gnu.org/g:d9d51e0552693bf1bcf6f23d53d058d60d72416e

commit r13-8462-gd9d51e0552693bf1bcf6f23d53d058d60d72416e
Author: Christoph Müllner <christoph.muellner@vrull.eu>
Date:   Mon Apr 24 23:09:06 2023 +0200

    riscv: xtheadmempair: Fix CFA reg notes
    
    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:
    
            PR target/114160
            * config/riscv/thead.cc (th_mempair_save_regs):
            Emit REG_FRAME_RELATED_EXPR notes in prologue.
    
    (cherry picked from commit 93973e4c5d3bcde1f84cad3b42a8c36e23900d19)
    
    Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

Diff:
---
 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