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From: "ubizjak 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: Fri, 28 Oct 2022 08:38:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107057

--- Comment #9 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
(In reply to Hongtao.liu from comment #7)
> And it looks like the pattern is wrongly defined since from [1].
>=20
> ----------cut begin------------
> Matching constraints are used in these circumstances. More precisely, the
> two operands that match must include one input-only operand and one
> output-only operand. Moreover, the digit must be a smaller number than the
> number of the operand that uses it in the constraint.
> ----------------cut end----------
>=20
> (define_insn "vec_concatv2df"
>   [(set (match_operand:V2DF 0 "register_operand"     "=3Dx,x,v,x,v,x,x, v=
,x,x")
> 	(vec_concat:V2DF
> 	  (match_operand:DF 1 "nonimmediate_operand" " 0,x,v,m,m,0,x,vm,0,0")
> 	  (match_operand:DF 2 "nonimm_or_0_operand"  " x,x,v,1,1,m,m, C,x,m")))]
>=20
>=20
> For alternatvie 1, the two operands are both input only.
>=20
> [1]
> https://gcc.gnu.org/onlinedocs/gccint/Simple-Constraints.html#Simple-
> Constraints

Perhaps an error should be emitted for this situation?=