On Sat, 2024-01-06 at 16:54 +0800, Lulu Cheng wrote:
> +(define_expand "addsi3"
> + [(set (match_operand:SI 0 "register_operand" "=r,r,r,r,r")
> + (plus:SI (match_operand:SI 1 "register_operand" "r,r,r,r,r")
> + (match_operand:SI 2 "plus_si_operand" "r,I,La,Le,Lb")))]
> + ""
>
From: liwei
We found that the current combine optimization pass in gcc cannot handle
the following redundant sign extension situations:
(insn 77 76 78 5 (set (reg:SI 143)
(plus:SI (subreg/s/u:SI (reg/v:DI 104 [ len ]) 0)
(const_int 1 [0x1]))) {addsi3}
(expr_list:REG_DEAD
