The gen_insn method is used to generate ADJUST_SP_RTX here, which has certain potential risks:
When the architecture adds pre-processing to `define_insn "adddi3"`, such as `define_expend "adddi3"`, the gen_expand will be automatically called here, causing the patern to emit directly, which will cause insn to enter REG_NOTE for `DWARF` instead of patern. The following error REG_NOTE occurred: error: invalid rtl sharing found in the insn: (insn 19 3 20 2 (parallel [ ... ]) (expr_list:REG_CFA_ADJUST_CFA (insn 18 0 0 (set (reg/f:DI 2 sp) (plus:DI (reg/f:DI 2 sp) (const_int -16 [0xfffffffffffffff0]))) -1 (nil)))) In fact, the correct one should be the following: (insn 19 3 20 2 (parallel [ ... ]) (expr_list:REG_CFA_ADJUST_CFA (set (reg/f:DI 2 sp) (plus:DI (reg/f:DI 2 sp) (const_int -16 [0xfffffffffffffff0]))))) Following the treatment of arm or other architectures, it is more reasonable to use gen_SET here. gcc/ChangeLog: * config/riscv/riscv.cc (riscv_adjust_libcall_cfi_prologue): Change gen_add3_insn to gen_rtx_SET. (riscv_adjust_libcall_cfi_epilogue): Likewise. --- gcc/config/riscv/riscv.cc | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc index 3b7804b7501..c9c6e53c6d0 100644 --- a/gcc/config/riscv/riscv.cc +++ b/gcc/config/riscv/riscv.cc @@ -5054,8 +5054,9 @@ riscv_adjust_libcall_cfi_prologue () } /* Debug info for adjust sp. */ - adjust_sp_rtx = gen_add3_insn (stack_pointer_rtx, - stack_pointer_rtx, GEN_INT (-saved_size)); + adjust_sp_rtx = + gen_rtx_SET (stack_pointer_rtx, + gen_rtx_PLUS (GET_MODE(stack_pointer_rtx), stack_pointer_rtx, GEN_INT (-saved_size))); dwarf = alloc_reg_note (REG_CFA_ADJUST_CFA, adjust_sp_rtx, dwarf); return dwarf; @@ -5176,8 +5177,9 @@ riscv_adjust_libcall_cfi_epilogue () int saved_size = cfun->machine->frame.save_libcall_adjustment; /* Debug info for adjust sp. */ - adjust_sp_rtx = gen_add3_insn (stack_pointer_rtx, - stack_pointer_rtx, GEN_INT (saved_size)); + adjust_sp_rtx = + gen_rtx_SET (stack_pointer_rtx, + gen_rtx_PLUS (GET_MODE(stack_pointer_rtx), stack_pointer_rtx, GEN_INT (saved_size))); dwarf = alloc_reg_note (REG_CFA_ADJUST_CFA, adjust_sp_rtx, dwarf); -- 2.17.1