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:

	* 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>

diff --git a/gcc/config/riscv/thead.cc b/gcc/config/riscv/thead.cc
index 752038053102cee81f3797a813157ebcff7d5c94..d7e3cf80d9b8a11240104bd233c4f04f8fd5bd2a 100644 (file)
--- 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