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From: "rguenther at suse dot de" <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 16:32:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100053

--- Comment #10 from rguenther at suse dot de <rguenther at suse dot de> ---
On April 13, 2021 5:28:37 PM GMT+02:00, "qinzhao at gcc dot gnu.org"
<gcc-bugzilla@gcc.gnu.org> wrote:
>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?

Yes, I did.=