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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 08:47:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107057

--- Comment #8 from Hongtao.liu <crazylht at gmail dot com> ---
And it looks like the pattern is wrongly defined since from [1].

----------cut begin------------
Matching constraints are used in these circumstances. More precisely, the t=
wo
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----------

(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")))]


For alternatvie 1, the two operands are both input only.

[1]
https://gcc.gnu.org/onlinedocs/gccint/Simple-Constraints.html#Simple-Constr=
aints=