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From: "qinzhao at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/100053] [9/10 Regression] tree-fre
 incorrectly delete a condition
Date: Tue, 13 Apr 2021 15:28:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100053

--- Comment #9 from qinzhao at gcc dot gnu.org ---
(In reply to Richard Biener from comment #3)
> It would be nice if the reduced testcase could be sanitized to throw less
> diagnostics with -Wall, likewise if it were a runtime testcase.
>=20
> Reduced:
>=20
> int __attribute__((returns_twice,noipa)) x() { return 0; }
> void __attribute__((noipa)) ar() {}
> void __attribute__((noipa)) as() { __builtin_abort (); }
> int a1, a2, a3;
> void __attribute__((noipa)) v(int init)
> {=20
>   if (!init) {
>     as();
>     if (a1)
>       goto aq;
>     if (x ())
>       if (a2)
>         as();
>   }
>   if (!init)
>     a3 =3D 1;
>   ar();
> aq:
>   if (!init)
>     as();
> }
>=20
> int main()
> {
>   v(1);
>   return 0;
> }

Hi, thanks for the further reduced testing case.
I am wondering whether you did the above further reducing manually?=