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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/107057] [10/11/12/13 Regression] ICE in
 extract_constrain_insn, at recog.cc:2692
Date: Wed, 26 Oct 2022 02:16:43 +0000
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X-Bugzilla-Keywords: ice-on-valid-code, ra
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107057

--- Comment #6 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Hongtao.liu from comment #5)
> I'm testing
>=20
> modified   gcc/lra-constraints.cc
> @@ -4382,7 +4382,14 @@ curr_insn_transform (bool check_only_p)
>  		 (op, (enum reg_class) goal_alt[i]) =3D=3D NO_REGS)
>  		|| no_input_reloads_p))
>  	  {
> -	    rtx tem =3D force_const_mem (mode, op);
> +	    rtx tem;
> +
> +	    /* PR 107057, for same constant pool, don't bother
> +	       force_const_mem again, just reuse the matched op.  */
> +	    if (goal_alt_matches[i] >=3D 0)
> +	      tem =3D *curr_id->operand_loc[goal_alt_matches[i]];
> +	    else
> +	      tem =3D force_const_mem (mode, op);
>=20=20
>  	    change_p =3D true;
>  	    if (subreg !=3D NULL_RTX)

It failed bootstrap since there's are matches ops with differnce mode

(define_insn "*fop_xf_4_i387"
  [(set (match_operand:XF 0 "register_operand" "=3Df,f")
        (match_operator:XF 3 "binary_fp_operator"
           [(float_extend:XF
              (match_operand:MODEF 1 "nonimmediate_operand" "fm,0"))
            (match_operand:XF 2 "register_operand" "0,f")]))]

I don't know if there're other usages, so for safety, i'll just invalid
goal_alt_matches when force_const_mem.=